EP2242630A2 - Procédé de fabrication de profilés extrudés - Google Patents

Procédé de fabrication de profilés extrudés

Info

Publication number
EP2242630A2
EP2242630A2 EP09701971A EP09701971A EP2242630A2 EP 2242630 A2 EP2242630 A2 EP 2242630A2 EP 09701971 A EP09701971 A EP 09701971A EP 09701971 A EP09701971 A EP 09701971A EP 2242630 A2 EP2242630 A2 EP 2242630A2
Authority
EP
European Patent Office
Prior art keywords
extruded profile
thermoplastic material
rubber
elastomeric material
extruded
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.)
Withdrawn
Application number
EP09701971A
Other languages
German (de)
English (en)
Inventor
Reiner Lay
Paul Wynen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2242630A2 publication Critical patent/EP2242630A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/10—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation for articles of indefinite length
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/304—Extrusion nozzles or dies specially adapted for bringing together components, e.g. melts within the die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B29K2105/002—Agents changing electric characteristics
    • B29K2105/0023—Agents changing electric characteristics improving electric conduction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/305—Wipers

Definitions

  • the invention relates to a method for producing extruded profiles from an elastomeric material.
  • Extruded profiles of an elastomeric material are used, for example, as a wiper blade for windscreen wipers in motor vehicles.
  • the squeegee are injection molded or extruded endless.
  • a previously mixed together starting material for example an unvulcanized natural or synthetic rubber, shaped and vulcanized.
  • double profiles are produced for economic reasons.
  • the double profiles are separated after vulcanization and during the optionally subsequent treatment along a cutting edge, which generally represents the subsequent wiping edge.
  • a wiper blade comprising a squeegee
  • a coating is applied to the squeegee.
  • coatings for example, films or granules are used.
  • the coating can be applied before or after vulcanization.
  • the wiper blade has a squeegee with a squeegee lip.
  • the wiper blade lip is partially made of polyethylene.
  • the polyethylene can either be applied as a coating on the wiper blade or be included in the volume of the wiper blade.
  • the coating enters into a non-detachable adhesive bond with the material of the wiper blade rubber.
  • a disadvantage of the known from the prior art method for the production of wiper rubbers is that the not yet vulcanized after shaping profile is permanently deformed by gravity and buoyancy forces in the salt bath used for vulcanization.
  • squeegee profiles with high wall thicknesses are produced to minimize deformation.
  • the high wall thicknesses limit the functional properties of the wiper blade, such as turning noise, in a negative way.
  • the process according to the invention for the production of extruded profiles from an elastomeric material comprises the following steps:
  • thermoplastic material (d) removing the thermoplastic material after vulcanizing the elastomeric material.
  • the extruded profile can be produced, for example, by an injection molding process or an extrusion process.
  • the extruded profile is preferably shaped by an extrusion process.
  • the complete or partial encasing of the extruded profile with the thermoplastic material preferably takes place during the extrusion of the extruded profile.
  • the as yet non-dimensionally stable elastomer composition is supported by the thermoplastic material until complete vulcanization.
  • the elastomeric material is covered by the thermoplastic material, whereby the injection swelling of the elastomeric material is reduced because there is no direct contact of the ambient air with the elastomeric material. This leads to an improvement in the surface quality, whereby the extrusion speed can be increased.
  • Another advantage is that in a complete sheathing of the extruded profile of the elastomeric material, the surface of the elastomeric material is protected from oxygen during vulcanization. This allows the production of peroxide mixtures also in the hot air process. This is not possible with the methods known from the prior art. According to the prior art, it is necessary to vulcanize peroxide mixtures in a salt bath.
  • a coextrusion process is preferably used to form the extruded profile and to completely or partially encase the extruded profile.
  • the already coated extruded profile exits directly from the tool nozzle.
  • thermoplastic material used for the jacket is preferably reused after removal. By reusing the thermoplastic material, only a small amount is required, so that the production costs can be kept low. Another advantage is that the thermoplastic material is not produced as waste in the production of the extruded profile of the elastomeric material.
  • the elastomeric material for the extruded profile is preferably selected from natural rubber, butadiene rubber, chloroprene Katuschuk, ethylene-propylene rubber, ethylene-propylene-diene rubber, urethane rubber, nitrile rubber, styrene-butadiene rubber, cis -1,4-polyisoprene rubber, silicone rubber, methyl silicone rubber, methyl silicone rubber with fluorine groups or mixtures thereof.
  • the elastomeric material for the extruded profile selected from ethylene-propylene-diene rubber, ethylene-propylene rubber, chloroprene rubber, natural rubber, silicone rubber and mixtures thereof.
  • thermoplastic material does not form an adhesive bond with the elastomeric material.
  • Thermoplastic polymers are particularly suitable as thermoplastic material. Suitable thermoplastic polymers which do not form an adhesive bond with the elastomeric material are, for example, polyethylene terephthalate (PET), polypropylene (PP), preferably isotactic polypropylene, polycarbonate (PC), polyamide, preferably polyamide 6 (P A6) and high molecular weight polyethylenes (PE-HMW).
  • the extrudate temperatures even at high temperature-, preferably remains dimensionally stable in the range from 120 0 C to 200 0 C, the thermoplastic material is preferably used filled.
  • the filler for example, chalk, glass fibers, glass spheres or silicates are used as the filler.
  • the thermoplastic material is extruded with a high wall thickness and a high temperature.
  • the temperature is preferably in the range above 180 0 C, in particular in the range of 180 0 C to 200 0 C.
  • the large wall thickness of the jacket of the thermoplastic material serves as a heat storage, wherein the heat is used to vulcanize the elastomeric material.
  • the temperature of the elastomeric material during sheathing is preferably in the range of 90 0 C to 120 0 C. In this way, it is no longer necessary to perform the vulcanization of the elastomer material in a salt bath or a hot air oven. Thus it can be dispensed with a costly Vulkanisationslit.
  • the thermoplastic material used for the cladding is electrically conductive, so that the thermoplastic material can be used as resistance heating for the vulcanization.
  • the electrically conductive thermoplastic material has a sufficiently large resistance to be used as a resistance heater.
  • Such an electrically conductive thermoplastic material usually contains an electrically conductive filler.
  • At least one friction-reducing substance is added to the thermoplastic material, which migrates to the surface of the extruded profile of the elastomeric material.
  • the addition of the friction-reducing substance reduces the dry-friction value due to the migration to the surface of the extruded profile.
  • the friction-reducing substance bonds between the thermoplastic material and the elastomeric material reduced, preferably prevented. This also facilitates a subsequent separation of thermoplastic material and elastomer material.
  • stearic acid amide As a friction-reducing substance which may be added to the thermoplastic material, stearic acid amide is suitable, for example.
  • the stearic acid amide does not dissolve in the thermoplastic material and therefore migrates to the surface and interface with the elastomeric material.
  • the stearic acid amide is mixed together with the filler with the thermoplastic material.
  • the proportion of stearic acid amide is preferably in the range of 1 to 5 wt .-%, based on the mass of the thermoplastic material.
  • the extruded profile produced by the method according to the invention is preferably a profile for a squeegee.
  • Wiper blades can be used for example in windscreen wipers for motor vehicles.
  • wiper rubbers are also used in pullers for window panes.
  • door or window seals are, for example, door or window seals.
  • Such door or window seals can be used for example in buildings or preferably in motor vehicles.
  • the extruded profile produced according to the invention is a squeegee for a windscreen wiper of a motor vehicle
  • the extruded profile for the squeegee is preferably designed as a double strip.
  • two wiper blades are connected to each other at their wiper edge.
  • the wiping edge thus acts as a line of symmetry. After completion of the double strip for the production of individual wiper rubbers along the wiping edge, that is the symmetry line is separated. This has the further advantage of producing a sharp edge that results in a better wiping result than a rounder edge, as would arise when a single squeegee is made.
  • FIG 3 shows a section through a double strip for a squeegee with a thin jacket.
  • FIG. 1 shows a section through a double strip for a squeegee with a complete sheathing.
  • a double strip 1 for a squeegee is an extruded profile 3, in which two wiper rubbers are formed, which are connected to one another at their wiper edge 5. To produce individual wiper rubbers of the double strip 1 is separated at the wiper edge 5. The wiping edge 5 simultaneously represents a symmetry line 7 of the double strip 1.
  • the wiper edge 5 In order to improve the functional properties of the wiper blade rubber, in particular in order to reduce, for example, transfer noise, it is desirable to form the wiper edge 5 with the smallest possible wall thickness.
  • a small wall thickness of the wiping edge 5 leads in known from the prior art manufacturing process that the extruded profile 3 due to gravity and buoyancy forces in the salt bath in which the double strip 3 is vulcanized, permanently deformed.
  • the extruded profile 3 is enclosed according to the invention with a jacket 9. In the embodiment shown in FIG. 1, the casing 9 encloses the extruded profile 3 completely.
  • the extruded profile 3 and the casing 9 can be produced by any manufacturing method known to the person skilled in the art. Usually, the production takes place by an injection molding process or an extrusion process. Particularly preferred for the production of the extruded profile 3, however, is an extrusion process.
  • the casing 9 is preferably formed in a production process with the extruded profile 3.
  • the extruded profile 3 together with the casing 9 is preferably produced by a coextrusion process.
  • the material for the extruded profile 3 and the material for the casing 9 are pressed simultaneously by the tool for forming the extruded profile 3.
  • the extruded profile 3 is thus enclosed during the manufacturing process with the sheath 9.
  • the material for the extruded profile 3 and the casing 9 is generally added via two separate screw machines, which are connected to a common coextrusion tool.
  • the material for the casing 9 is preferably chosen so that this is dimensionally stable after a very short distance behind the tool and so a deformation of the extruded profile 3 is avoided.
  • a thermoplastic material is preferably used. Particularly suitable are, for example, polyethylene terephthalate (PET), polypropylene (PP), preferably isotactic polypropylene, polycarbonate (PC), polyamide, preferably polyamide 6 (P A6) and high molecular weight polyethylene (PE-HMW).
  • thermoplastic material is used for the casing, which makes no connection with the material of the extruded profile 3 in order to remove the casing 9 after vulcanization of the extruded profile of the elastomeric material can again.
  • the material for the casing 9, for example, friction substances are buried, which are to migrate to the surface of the extruded profile 3, it is preferable to leave the casing even after vulcanization for a predetermined storage time to allow the reibwertmindernden substances on the Surface of the extruded profile 3 to migrate. Migration can be accelerated, for example, by the application of heat, as is the case during vulcanization.
  • additives that are to migrate to the entire surface of the squeegee should not be used because too little area of the squeegee is sheathed.
  • the vulcanization of the elastomer material of the extruded profile 3 takes place after the jacket.
  • the vulcanization takes place by any method known to the person skilled in the art. Usually, the vulcanization is carried out in the salt bath or in the hot air or infrared channel.
  • the sheath 9, the support 11 and the thin sheath 13 is removed again.
  • the removal takes place, for example, by peeling or stripping off the casing 9, the support 11 or the thin shell 13.
  • notches 15 are provided in the shell 9.
  • thermoplastic material from which the sheath 9, the support 11 and the thin sheath 13 are formed can be remelted and reused.
  • thermoplastic material of the sheath or the thin shell 13 in addition to the vulcanization in salt bath or hot air or infrared channel, it is also possible, for example, the thermoplastic material of the sheath or the thin shell 13 to add an electrically conductive additive, so that the thermoplastic material is made electrically conductive. With sufficient resistance, the material of the sheath 9 or of the thin sheath 13 can then be used as a resistance heating source for the vulcanization.
  • thermoplastic material of the casing 9, of the support 11 or of the thin casing 13 is preferably used which does not form an adhesive bond with the elastomer material of the extruded profile.
  • the method according to the invention can also be used to produce any other extruded profile made of an elastomeric material. It is thus possible, for example, to produce extruded profiles for sealing rubbers or very thin-walled tubes by the method according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Toxicology (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication de profilés extrudés (3) en matériau élastomère, selon lequel, dans une première étape, le profilé extrudé (3) est formé à partir du matériau élastomère, puis le profilé extrudé (3) est enveloppé entièrement ou partiellement d'un matériau thermoplastique et le matériau élastomère enveloppé du matériau thermoplastique est vulcanisé, enfin, le matériau thermoplastique est enlevé après vulcanisation du matériau élastomère.
EP09701971A 2008-01-16 2009-01-13 Procédé de fabrication de profilés extrudés Withdrawn EP2242630A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008004636A DE102008004636A1 (de) 2008-01-16 2008-01-16 Verfahren zur Herstellung von Strangprofilen
PCT/EP2009/050293 WO2009090157A2 (fr) 2008-01-16 2009-01-13 Procédé de fabrication de profilés extrudés

Publications (1)

Publication Number Publication Date
EP2242630A2 true EP2242630A2 (fr) 2010-10-27

Family

ID=40740108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09701971A Withdrawn EP2242630A2 (fr) 2008-01-16 2009-01-13 Procédé de fabrication de profilés extrudés

Country Status (4)

Country Link
US (1) US8728367B2 (fr)
EP (1) EP2242630A2 (fr)
DE (1) DE102008004636A1 (fr)
WO (1) WO2009090157A2 (fr)

Families Citing this family (16)

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Publication number Priority date Publication date Assignee Title
US9457768B2 (en) 2011-04-21 2016-10-04 Pylon Manufacturing Corp. Vortex damping wiper blade
CA2843527C (fr) 2011-07-28 2018-11-27 Pylon Manufacturing Corp. Adaptateur, raccord et ensemble d'essuie-glace
US9108595B2 (en) 2011-07-29 2015-08-18 Pylon Manufacturing Corporation Windshield wiper connector
US20130219649A1 (en) 2012-02-24 2013-08-29 Pylon Manufacturing Corp. Wiper blade
MX385411B (es) 2012-02-24 2025-03-18 Pylon Mfg Corp Escobilla limpiaparabrisas.
US10723322B2 (en) 2012-02-24 2020-07-28 Pylon Manufacturing Corp. Wiper blade with cover
DE102012204748A1 (de) 2012-03-26 2013-09-26 Robert Bosch Gmbh Reibwertreduziertes Wischgummi
US10829092B2 (en) 2012-09-24 2020-11-10 Pylon Manufacturing Corp. Wiper blade with modular mounting base
US10166951B2 (en) 2013-03-15 2019-01-01 Pylon Manufacturing Corp. Windshield wiper connector
US9505380B2 (en) 2014-03-07 2016-11-29 Pylon Manufacturing Corp. Windshield wiper connector and assembly
US10363905B2 (en) 2015-10-26 2019-07-30 Pylon Manufacturing Corp. Wiper blade
CN109311450A (zh) 2016-05-19 2019-02-05 电缆塔制造有限公司 挡风玻璃雨刮器连接器
AU2017268008A1 (en) 2016-05-19 2018-11-22 Pylon Manufacturing Corp. Windshield wiper connector
CN109311452A (zh) 2016-05-19 2019-02-05 电缆塔制造有限公司 挡风玻璃雨刮器连接器
EP3458315B1 (fr) 2016-05-19 2021-09-08 Pylon Manufacturing Corp. Balai d'essuie-glace
US11040705B2 (en) 2016-05-19 2021-06-22 Pylon Manufacturing Corp. Windshield wiper connector

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JPS5793132A (en) * 1980-12-01 1982-06-10 Togawa Gomme Seizosho:Kk Production of rubber hose
JPS6172507A (ja) * 1984-09-17 1986-04-14 Meiji Gomme Kasei:Kk ホ−スの連続加硫方法

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Publication number Priority date Publication date Assignee Title
JPS5793132A (en) * 1980-12-01 1982-06-10 Togawa Gomme Seizosho:Kk Production of rubber hose
JPS6172507A (ja) * 1984-09-17 1986-04-14 Meiji Gomme Kasei:Kk ホ−スの連続加硫方法

Also Published As

Publication number Publication date
US8728367B2 (en) 2014-05-20
US20100276845A1 (en) 2010-11-04
DE102008004636A1 (de) 2009-07-23
WO2009090157A2 (fr) 2009-07-23
WO2009090157A3 (fr) 2009-09-11

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