WO2000010796A1 - Procede d'assemblage de tuyaux en plastique et raccords thermosoudes pour ces derniers - Google Patents

Procede d'assemblage de tuyaux en plastique et raccords thermosoudes pour ces derniers Download PDF

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Publication number
WO2000010796A1
WO2000010796A1 PCT/EP1999/006156 EP9906156W WO0010796A1 WO 2000010796 A1 WO2000010796 A1 WO 2000010796A1 EP 9906156 W EP9906156 W EP 9906156W WO 0010796 A1 WO0010796 A1 WO 0010796A1
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WIPO (PCT)
Prior art keywords
fitting
heating element
pipe
electrical heating
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP1999/006156
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English (en)
Inventor
Jyri Jaakko Jarvenkyla
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Uponor Innovation AB
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Uponor Innovation AB
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Publication date
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Priority to AU58541/99A priority Critical patent/AU5854199A/en
Publication of WO2000010796A1 publication Critical patent/WO2000010796A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1228—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least one monotone curved joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1282—Stepped joint cross-sections comprising at least one overlap joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1284—Stepped joint cross-sections comprising at least one butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1288—Stepped joint cross-sections comprising at least one monotone curved joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73755—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being fully cured, i.e. fully cross-linked, fully vulcanized
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • B29C66/72343—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer for liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73755—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being fully cured, i.e. fully cross-linked, fully vulcanized
    • B29C66/73756—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being fully cured, i.e. fully cross-linked, fully vulcanized the to-be-joined areas of both parts to be joined being fully cured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7394—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset
    • B29C66/73941—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset characterised by the materials of both parts being thermosets

Definitions

  • This invention relates to the joining of plastics pipes, and more particularly to an improved method for the joining of plastics pipes by heat fusion and to heat fusion fittings therefor.
  • the pipes are inserted into the sleeve into abutment with one another, or into abutment with a stop member, and the heater elements are then energised. Upon heating of the heater elements, the adjacent regions of the sleeve are softened to the point of fusion, whereby the polymeric materials of the pipes and sleeve are fused together.
  • Electrofusion fittings have been successfully employed for a wide variety of applications but, due to the need to provide upstanding terminals in order to connect a power source to the electrical resistance heater element, it has not proved possible to use such fittings in joining plastics pipe used for "no-dig" pipe systems where the pipe is pushed or pulled through the ground, or through a restricted aperture such as a protective conduit, well - ole, or the like. Problems can also arise in tightly fitting installations above ground, for example, in installations passing through walls.
  • US Patent No 2739829 takes a slightly different approach using induction heating as opposed to resistance heating. Strips of metallic material are placed between a sleeve and the pipes to be joined at two locations spaced from the abutment region of the two pipes. A coil connected to an AC source is employed to heat the metallic strips to produce fusion of the polymeric material of the sleeve with the polymeric material of the pipes.
  • Heat fusion fittings are conventionally manufactured by injection moulding the entire plastics body of the fitting over the metallic heating element. This is because it is desirable to locate the heating element or elements accurately within the fitting in order to leave so-called "cold zones" or unheated areas at the ends of the fitting, and adjacent the abutment region of the pipes, in the case of an in-line coupling, to prevent escape of fused polymeric material from the melt fusion regions. This is discussed in US5338920. The need to provide cold zones increases the length of the fitting.
  • the plastics pipe is inserted into the fitting, which must therefore have an external diameter greater than that of the pipe. If used in "no-dig” applications, the fitting is subjected to severe mechanical stresses which can easily damage the fitting as the pipe is pulled or pushed through the ground.
  • a method of joining plastics pipes and a heat fusion fitting are provided, in which the external diameter of the fitting can conform more closely to the external diameter of the pipe, the need to provide upstanding electrical terminals can be obviated, and the need to provide cold zones to contain the melt can be reduced.
  • the present invention provides a method of forming a fusion joint between a plastics pipe and a heat fusion fitting, wherein the fitting comprises a hollow, tubular body of outer diameter substantially the same as the outer diameter of the pipe and inner diameter greater than the inner diameter of the pipe, the tubular body having an inner wall comprising a fusible thermoplastic polymeric material, and an electrical heating element wholly or partly embedded in the inner wall of the tubular body, which comprises; preparing the pipe end by removing a section of the outer wall of the pipe along a length thereof adjacent the pipe end, sufficient to accommodate the fitting, inserting the prepared pipe end into the fitting, and energising the electrical heating element so as to fuse the thermoplastic polymeric material and form a fusion joint between the pipe and the fitting.
  • the invention provides a heat fusion fitting which comprises;
  • a hollow tubular body having an inner wall comprising a fusible thermoplastic polymeric material
  • the invention provides a low profile fusion joint for a plastics pipe manufactured using the method of the first aspect of the invention and the heat fusion fitting of the second aspect of the invention.
  • the method of the invention is particular applicable to the joining of plastics pipe used for "no-dig" pipe laying applications and will henceforth be more particularly described in relation thereto. It will be appreciated, however, that the invention is not limited thereto, and is generally applicable to the joining of a wide range of plastics pipes in many situations, especially where the joint is required to have a low profile.
  • plastics pressure pipe which is required to conduct fluids or gases under relatively high pressure
  • plastics pipes can be wholly or partly formed of cross-linked plastics material, but preferably at least an inner layer will be formed.
  • the pipe can, for example, be of a dual layer or multiple layer construction, for example, with one or more outer uncross-linked layers surrounding one or more cross- linked inner layers, or vice versa.
  • Such pipes can comprise, for example, various barrier layers and tie layers.
  • barrier layers include benzene barrier layers such as nylon and PBT layers, oxygen barrier layers such as EVOH, and water barrier layers such as PVCC .
  • Some barrier layers may also comprise a metallic layer or layers.
  • the pipe may also be extruded with corrugations or ribs on its outer surface.
  • a pipe with a corrugated outer surface or portion thereof can enable bends to be formed along its length.
  • a pipe with a ribbed outer surface can provide improved ring stiffness.
  • the fusible thermoplastic polymeric material comprising the inner wall of the body of the heat fusion fitting is preferably a polyolefin or an olefin copolymer.
  • Suitable polymeric materials include, for example, polymers, copolymers and polymeric blends of ethylene, propylene, butylene, pen ene, styrene, butadiene, vinyl alcohols, esters and amides, vinyl halides and similar monomers.
  • Polyethylene and ethylene copolymers are the preferred polymeric materials for use in the fitting of the present invention.
  • the outer wall of the body of the heat fusion fitting can comprise a cross-linked or uncross-linked polymeric material .
  • the polymeric material of the outer wall can be cross-linked, for example, by the use of chemical cross-linking agents, for example, peroxides, silanes and similar materials, or by the use of irradiation, for example, electron beam irradiation, or UV light irradiation, using suitable cross-linking promoters, such as triallyl cyanurate .
  • Chemical cross- linking during extrusion or moulding is the preferred route, for example, as disclosed in International Application PCT/EP96/02801, the entire disclosure of which is incorporated herein by reference for all purposes.
  • the polymeric material of the outer wall can be cross-linked to an extent of at least 5%, preferably to an extent of from 30% to 95%.
  • the degree of cross- linking in this specification is expressed as gel content, and measured using the method of ANSI/ASTM D2765-68.
  • Cross-linking the polymeric material can, of course, improve the long term modulus of the fitting and improve its pressure retention.
  • the plastics pipe to be joined using the heat fusion fitting can be formed from a polymeric material that can be the same or different from the polymeric material of the fitting.
  • a polymeric material that can be the same or different from the polymeric material of the fitting.
  • at least a layer of the pipe wall comprises a cross-linked polymeric material, preferably a cross-linked polyolefin material.
  • the polymeric material of the pipe can be cross -linked using, for example the cross-linking techniques set out above .
  • Either the pipe and the fitting or both of them can be formed wholly or partly from an oriented polymeric material, and can be produced, for example, by the method described in PCT/EP96/02801.
  • the polymeric material of the pipe and/or the fitting can have mineral fillers such as talc incorporated therein, and this is preferable where the pipe is to be pushed through the soil, since the presence of mineral fillers has been found to improve dramatically the compressive strength of the polymeric material of the pipe and the fitting.
  • the mineral filler may be present in an amount of from 2% to 60% by weight.
  • One or more electrical heating elements can be used in the method and fitting of the invention. Whilst it would be possible to utilise an electrofusion heating element employing the so-called “connectorless" electrofusion element principle, at least in the first aspect of the invention, and even an electrofusion element having upstanding terminals in the second aspect of the invention, it is preferred to use a ferromagnetic heating element. Suitable ferromagnetic heating elements are disclosed in the patent specifications mentioned hitherto, but preferably the heating element comprises a wire of copper or like conductive material covered with a ferromagnetic material as described in US4256945.
  • the wire can, for example, be formed into a spiral with cross members, a plurality of widely spaced rings also with cross members, a mesh of widely spaced wires forming large squares, or the like. Due to the fact that the ferromagnetic material surrounds the wires in the preferred configuration, demagnetising (edge) effects are not present. Furthermore, the arrangement of a ferromagnetic material on a copper wire behaves as set forth in US 4256945, and temperature regulation is excellent and occurs incrementally along the wires so that the temperature is controlled and substantially uniform throughout. Preferred ferromagnetic heating elements are described and claimed in W092/15182. The entire disclosure of W092/15182 is incorporated herein by reference for all purposes.
  • the ferromagnetic heating element is of a generally tubular construction.
  • the ferromagnetic heating element can, for example, be in the form of a coil, a wire cage, a wire mesh, for example, in the form of a double helix, or a cage of corrugated or perforated metal.
  • the ferromagnetic heating element can comprise ferromagnetic particles that are dispersed in a polymeric material, for example, as described in US5189271.
  • the pressure resistance at its mid-point where the pipe ends meet can be a critical feature. This means that if the pipe spigot ends or the fitting wall are reduced in thickness in this area it will normally become a weak spot and the joint will fail.
  • the electrical heating element is arranged so as to provide a reinforcement in this critical area. It has been surprisingly observed that in order to obtain adequate reinforcement it is not necessary that the coverage of the electrical heating element reinforcement be 100% and, for example, it can be as low about 50-80%, which means that the adjacent wires of a coil, for example, need not be wound side-by-side . With a wire mesh, the holes in the mesh can have a diameter almost equivalent to the wall thickness of the joint whilst still providing effective reinforcement. In general, however, the coverage of the electrical heating element reinforcement of the present invention at its central region is greater than that of a conventional heating element, which is normally wound tightly at its ends and very sparsely in its central region.
  • the electrical heating element can be further shaped in such a fashion as to provide the fusion joint with a reinforcement against internal pressure in the pipe. This can be achieved by enlarging the internal diameter of the electrical heating element towards an or each outlet of the fitting. The enlargement can be the result of a continuous increase in diameter, for example, such that the outlet has a bell or trumpet shape, although other configurations are also possible.
  • the enlarged diameter end sections of the electrical heating element can have fewer turns of wire, if necessary, to reduce the heating effect in these regions.
  • an induction heating it may be possible to shield the end sections from the induction heater to create "cold
  • the electrical heating element and the inner wall of the tubular body of the fitting are both enlarged towards an or each outlet of the fitting, so that the interior of the fitting, which is preferably of substantially constant diameter at its central section, has at the or each outlet a continuous increase in diameter to form a bell or trumpet shape.
  • the interior of the fitting is preferably enlarged adjacent the or each outlet
  • the exterior of the fitting is preferably of smooth, cylindrical shape, conforming to the outer diameter of the pipe to be joined.
  • the outer diameter of the fitting can be, for example, from 90% to 120% of the outer diameter of the pipe.
  • the wall thickness of the tubular body will generally decrease towards an or each of its outlets.
  • the heat fusion fitting is provided with an electrical heating element having a central region of increased diameter, such that the contour of the electrical heating element in the central region of the fitting encloses a fillet of fusible thermoplastic polymeric material forming a reservoir of fusible material to give improved pressure resistance to the central region of the joint which is adjacent the abutting ends of the pipes to be joined.
  • the pressure resistance is of course improved if the coil or mesh of the electrical heating element in the central region is also reasonably tight. Where a mesh is used, the longitudinal cross members also add to the tensile and compression strength of the fitting.
  • an insert in the manufacture of the fitting an insert can first be formed by moulding an insert plastics material around the electrical heating element, so that the electrical heating element is embedded or partly embedded therein.
  • Other forming methods such as casting or extruding can be used as appropriate.
  • An advantage of this method is that the plastics material of the insert can be chosen to be compatible with the polymeric material of the surface layer of the first plastics pipe, and with the polymeric material of the body of the fitting to which it is to be joined. This can also enable two or more pipes of dissimilar materials to be joined using a single fitting and an appropriate choice of plastics material for the insert.
  • a fitting can be used to join together cross-linked polyethylene and PVC pipes using the appropriate plastics material inserts.
  • the electrical heating element is preferably wholly embedded in the insert plastics material, so that it is protected from damage when the body of the fitting is moulded around it. It will be appreciated that a ferromagnetic heating element when used should have a Curie point well in excess of the crystalline melting point or softening point of the insert plastics material.
  • the insert plastics material can comprise any of the polymeric materials listed earlier in connection with the body of the heat fusion fitting and can be the same or different from the body.
  • the insert plastics material can, if desired, have adhesive properties, at least in the molten state, and, for example, plastics materials comprising hot melt adhesives, for example, polyamides and ethylene/vinyl acetate polymers can also be used.
  • the insert plastics material is preferably uncross- linked, however, or at least is cross-linked to only a small extent, preferably less than 35%, more preferably less than 5%, so that it is still capable of melt fusion.
  • the insert plastics material is preferably uncross-linked polyethylene, and, for example, there may be used Borealis 0909 (tm) which is extra stabilised to resist heat degradation.
  • the moulding of the insert plastics material around the electrical heating element provides a reservoir of fusible material adjacent the heating element in preparation for the temperature controlled fusion step and can be used to form the fillet previously described.
  • the insert plastics material can also be shaped so that the insert is an accurate dimensional fit in the body of the fitting, and the moulded plastics material can be extended axially of the electrical heating element to form in-situ pre-moulded "cold zones" to contain the flow of melt from the melt region, although in preferred embodiments this may not be necessary.
  • the insert plastics material can also have end sections moulded to perform other functions.
  • the end sections of the moulded insert plastics material can, for example, be provided with internal grooves for accommodating sealing means, for example, resilient gaskets or O-rings.
  • sealing means for example, resilient gaskets or O-rings.
  • gaskets or O-rings also have the advantage that they can help to prevent particles of dust or other contaminants from entering the melt region when the pipe end is inserted into the fitting.
  • a further advantage of the use of a plastics material insert overmoulded around the electrical heating element is that, in certain preferred embodiments of the invention, means can be provided to compensate for any tolerance variations between the pipe spigot end and the fitting. Such tolerance variations are very undesirable and in extreme cases could lead to a leaking joint.
  • the compensating means can comprise, for example, the use of a plastics material capable of volume expansion at the fusion temperature, or at a temperature at which the plastics material has softened.
  • the expansion can, for example, be provided by the inclusion of a quantity of a blowing agent in the plastics material.
  • the blowing agent can be a solid or a liquid but is preferably a solid.
  • a typical suitable blowing agent is an azodicarbonamide, which can be present in an amount of from 0.5 to 4% by weight.
  • blowing agent When injection moulding a plastics material comprising a blowing agent it is important to ensure that the blowing agent does not expand or react prematurely, and this can be achieved, for example, by employing a high after pressure at the injection moulding stage.
  • the use of a blowing agent as described can enable any small gap between the spigot and the fitting to be filled by expanding fused polymeric material when the electrical heating element is energised, thus reducing the risk of leakage from the joint.
  • the use of a moulded insert enables the body of the fitting to be formed from a wide range of materials which may be chosen for their special properties.
  • the body of the fitting could, for example, be produced from steel, giving improved barrier strength, abrasion resistance, pressure resistance and/or tensile and/or compressive strength, whilst the insert provides the fusible material for the fusion joint, providing bonding and tightness.
  • the insert is so shaped that it is locked in place in the body, at least when the pipe ends are inserted into the fitting.
  • This aspect of the invention enables a large range of fitting bodies to be provided, with special properties such as barrier properties, traceability detection, electrical conductance from pipe end to pipe end across the joint, magnetic properties, light emitting arrangements and installation fixing points, whilst by changing the polymeric material of the insert covering the electrical heating element, the fitting can be adapted to different pipe materials.
  • the ferromagnetic heating element when used preferably has a Curie temperature that is at least 10 °C, more preferably from 20°C to 80 °C greater than the crystalline melting point or softening point of the polymeric materials forming the fusion joint.
  • an end of a plastics pipe to be joined is prepared by removing a smoothly contoured section of the outer wall of the pipe at an end thereof with a tool, so that the contour of the remaining pipe wall conforms closely to the contour of the inner wall of the fitting.
  • the prepared pipe end preferably has a region of substantially constant thickness, and a region of smoothly increasing thickness extending up to the outer wall of the pipe.
  • the gap between their abutting surfaces is preferably as small as possible, consistent with easy handling.
  • the fitting preferably occupies the volume of pipe removed during preparation.
  • the maximum wall thickness of the fitting is about X A to 3 A, more preferably about ⁇ £ the thickness of the pipe wall before preparation.
  • Figure 1 shows a sectional side elevation of a first pipe end, prepared to be received in a heat fusion fitting according to the invention
  • Figure 2 shows a sectional side elevation of a heat fusion fitting according to the invention
  • Figure 3 shows a sectional side elevation of a completed heat fusion joint according to the invention
  • Figure 4 shows a sectional side elevation of a further embodiment of a heat fusion fitting according to the invention, comprising a moulded plastics insert.
  • FIG. 1 there is shown a plastics pipe illustrated generally at 1, formed from polyethylene, having an end 2 which has been prepared to receive a heat fusion fitting as shown in Figure 2.
  • the pipe can be formed, for example, from cross-linked or uncross-linked polyethylene, or can, if desired have a layered composite structure comprising different polymeric materials which can be cross-linked or uncross-linked.
  • the pipe end 2 has been reduced in outer diameter by the use of a cutting tool, so that the wall thickness is reduced to about half.
  • a region 3, of smoothly increasing thickness and outer diameter is produced by the cutting tool in order to follow the contour of the fitting.
  • the heat fusion fitting illustrated generally at 10, comprises a cylindrical body 11 formed from uncross-linked polyethylene, having a ferromagnetic induction heating element 12 embedded therein.
  • the element 12 comprises a cage formed from a coil of ferromagnetic heating wire.
  • the body 11 may have been moulded directly around the element 12, or the element may first have been coated with a fusible polyethylene material to form an insert.
  • the induction heating element 12 has bell-shaped end regions 13, 14 of smoothly increasing diameter, intermediate regions 15, 16 of constant diameter, and a central region 17 of increased diameter.
  • the body 11 of the fitting follows the contours of the element 12 at its ends 18, 19 which are also of smoothly increasing internal diameter. However between the ends 18, 19 the body has a substantially constant internal diameter, which creates a fillet 20 of uncross-linked polyethylene beneath the central region 17 of the element 12.
  • FIG. 3 there is shown a completed fusion joint between the pipe 1 and a second pipe 21.
  • Each of the pipes 1, 21 has an end 2, 22 prepared as previously described, and the pipe ends 2, 22 are each inserted into the fitting 10 as shown.
  • the ferromagnetic heating wire of the induction heating element 12 is energised by means of an external induction heater (not shown) .
  • the ferromagnetic heating wire has a Curie point temperature which is greater than the crystalline melt temperature of the polyethylene material of the body 11 of the fitting 10, and the polyethylene material of the plastics pipes 1, 20.
  • the polyethylene materials become fused, and form a temperature controlled fusion bond between the plastics pipes 1, 20 and the internal surface of the fitting 10.
  • Extrusion of fused polymeric material from the central joint region 17 is substantially prevented by the shape of the heating element 12, the regions 15, 16 acting as barriers to movement of fused material . If necessary, the bell-shaped end regions 13, 14 can be shielded from the external induction heater in order to create cold zones at the ends of the fitting.
  • the joint has a low profile because the fitting has an external diameter no greater than the external diameter of the pipes.
  • the strength of the fitting in resisting internal pressure is obtained by the shape of the element 12, which reinforces the fusion joint and also provides a fusion bond along its full length, including the regions 18, 19 at the ends of the fitting.
  • the shape of the element at the ends of the fitting not only resists pressure from within the pipe during service but also reduces extrusion of any fused polymeric material during fusion.
  • FIG 4 shows a further embodiment of a heat fusion fitting, illustrated generally at 30.
  • the fitting comprises an outer cross-linked polyethylene body 31, within which is positioned a moulded uncross-linked polyethylene insert 31a.
  • the moulded insert 31a has a ferromagnetic induction heating element 32 embedded therein.
  • Other reference numerals have the same significance as in Figure 2.
  • the invention provides an excellent and improved method for the temperature controlled induction jointing of plastics pipes giving a strong, pressure resisting low profile joint.
  • the joint is particularly suitable for "no-dig" applications and for pipe-bursting and internal lining applications.
  • a further application may be possible in manufacturing submerged long distance pipe lines, where an external energising induction coil can remain stationary whilst the pipe is pushed stepwise there through to form the fusion joint as the pipe is laid.
  • a similar arrangement may be suitable for certain pipe relining applications.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

L'invention concerne un procédé de mise en forme d'un joint de thermosoudage entre un tuyau de plastique (1, 20) et un raccord thermosoudé (10). Ce raccord (10) comprend un corps tubulaire, creux dont le diamètre extérieur est sensiblement le même que le diamètre extérieur du tuyau (1, 20) et dont le diamètre intérieur est supérieur au diamètre intérieur du tuyau (1, 20). Ce corps tubulaire (11) comprend une paroi intérieure comprenant un matériau polymère thermoplastique fusible, et un élément de chauffage (12) totalement ou partiellement encastré dans la paroi intérieure du corps tubulaire (11). Ce procédé consiste à préparer l'extrémité du tuyau en retirant une section de la paroi extérieure du tuyau sur une longueur de ce dernier adjacente à l'extrémité du tuyau et suffisante pour recevoir le raccord. Ce procédé consiste ensuite à insérer l'extrémité du tuyau préparé dans le raccord, et à mettre sous tension l'élément de chauffage (12) pour provoquer la fusion du matériau polymère thermoplastique et former un joint de thermosoudage entre le tuyau (1, 20) et le raccord (10).
PCT/EP1999/006156 1998-08-21 1999-08-20 Procede d'assemblage de tuyaux en plastique et raccords thermosoudes pour ces derniers Ceased WO2000010796A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58541/99A AU5854199A (en) 1998-08-21 1999-08-20 Method of joining plastics pipes and heat fusion fittings therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9818249.6 1998-08-21
GB9818249A GB2340904B (en) 1998-08-21 1998-08-21 Method of joining plastics pipes and heat fusion fittings therefor

Publications (1)

Publication Number Publication Date
WO2000010796A1 true WO2000010796A1 (fr) 2000-03-02

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Family Applications (1)

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PCT/EP1999/006156 Ceased WO2000010796A1 (fr) 1998-08-21 1999-08-20 Procede d'assemblage de tuyaux en plastique et raccords thermosoudes pour ces derniers

Country Status (3)

Country Link
AU (1) AU5854199A (fr)
GB (1) GB2340904B (fr)
WO (1) WO2000010796A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1520684A1 (fr) * 2003-10-03 2005-04-06 Uponor Innovation Ab Assemblage par soudure
FR2879121A1 (fr) * 2004-12-15 2006-06-16 Inergy Automotive Systems Res Procede pour la connexion d'une piece tubulaire en matiere plastique a une goulotte d'un reservoir a carburant egalement en matiere plastique
FR2917481A1 (fr) * 2007-06-15 2008-12-19 Nobel Plastiques Soc Par Actio Procede de liaison de tubes par soudage magnetique
TWI571588B (zh) * 2015-06-24 2017-02-21 Ian Larsen 大口徑沉水管的結合裝置及其結合方法
CN116077800A (zh) * 2022-12-08 2023-05-09 美度可医疗科技(上海)有限公司 一种解决多段导管对接强度和密封性的桥接方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2415024B (en) * 2002-05-14 2006-03-29 Uponor Innovation Ab Composite electrofusion fitting
GB2388635B (en) * 2002-05-14 2006-03-29 Uponor Innovation Ab Composite electrofusion fitting

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EP0458957B1 (fr) 1989-12-15 1996-08-14 Raychem Corporation Systeme de raccord par fusion de tuyaux et procede s'y rapportant
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JPH1061868A (ja) * 1996-08-13 1998-03-06 Hitachi Metals Ltd プラスチック製埋設配管

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CH336980A (de) * 1955-09-16 1959-03-15 Fischer Ag Georg Verfahren zum Zusammenschweissen von Rohrleitungselementen aus Kunststoff
US3238346A (en) 1963-08-05 1966-03-01 George P Savko Apparatus for making joint between thermo plastic pipe and fittings thereof
FR1473009A (fr) 1964-07-14 1967-03-17 Tecalemit Procédé de soudage de tuyaux en matière plastique de préférence de petit diamètre et joint réalisé selon ce procédé
US4090899A (en) * 1974-12-06 1978-05-23 Georg Fischer A.G. Thermoplastics welding method
WO1980002124A1 (fr) 1979-04-05 1980-10-16 Haxey Eng Ltd Procede pour connecter des tuyaux en matiere plastique thermodurcissable et leurs raccords
US4256945A (en) 1979-08-31 1981-03-17 Iris Associates Alternating current electrically resistive heating element having intrinsic temperature control
GB2083406A (en) * 1980-08-29 1982-03-24 Sturm Werner Thermoplastic welding sleeve and a mold assembly for making same
EP0333379A2 (fr) * 1988-03-12 1989-09-20 Victaulic Plc Procédé pour la liaison de corps en polyoléfine
EP0337037A1 (fr) * 1988-04-11 1989-10-18 Societe Alphacan Tubes à base de résine polyoléfinique pour la réalisation de canalisations, manchons pour leur assemblage, et procédé pour leur fabrication
EP0458957B1 (fr) 1989-12-15 1996-08-14 Raychem Corporation Systeme de raccord par fusion de tuyaux et procede s'y rapportant
EP0480053A1 (fr) * 1990-03-30 1992-04-15 Kubota Corporation Joint forme par fusion electrique
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CH683026A5 (de) * 1991-06-18 1993-12-31 Gunzenhauser Ag J & R Schweissmuffe für Kunststoffrohre.
EP0566316A2 (fr) 1992-04-16 1993-10-20 Raychem Corporation Améliorations pour des corps de chauffe
JPH07151289A (ja) * 1993-11-30 1995-06-13 Mitsubishi Plastics Ind Ltd 電気融着継手
JPH09257182A (ja) * 1996-03-21 1997-09-30 Torii Kasei Kk 合成樹脂管及びその接続方法
JPH1061868A (ja) * 1996-08-13 1998-03-06 Hitachi Metals Ltd プラスチック製埋設配管

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1520684A1 (fr) * 2003-10-03 2005-04-06 Uponor Innovation Ab Assemblage par soudure
FR2879121A1 (fr) * 2004-12-15 2006-06-16 Inergy Automotive Systems Res Procede pour la connexion d'une piece tubulaire en matiere plastique a une goulotte d'un reservoir a carburant egalement en matiere plastique
WO2006064005A1 (fr) 2004-12-15 2006-06-22 Inergy Automotive Systems Research (Societe Anonyme) Procede de raccord d’une piece tubulaire en plastique au col d’un reservoir de carburant egalement en plastique
FR2917481A1 (fr) * 2007-06-15 2008-12-19 Nobel Plastiques Soc Par Actio Procede de liaison de tubes par soudage magnetique
WO2009007537A1 (fr) * 2007-06-15 2009-01-15 Nobel Plastiques Procede de liaison de tubes par soudage magnetique
TWI571588B (zh) * 2015-06-24 2017-02-21 Ian Larsen 大口徑沉水管的結合裝置及其結合方法
US10260658B2 (en) 2015-06-24 2019-04-16 Jan Larsen Underwater pipe assembly and method for assembling underwater pipes
CN116077800A (zh) * 2022-12-08 2023-05-09 美度可医疗科技(上海)有限公司 一种解决多段导管对接强度和密封性的桥接方法

Also Published As

Publication number Publication date
GB2340904B (en) 2003-05-21
AU5854199A (en) 2000-03-14
GB9818249D0 (en) 1998-10-14
GB2340904A (en) 2000-03-01

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