EP0039363A1 - Tuyau thermoplastique antistatique - Google Patents

Tuyau thermoplastique antistatique

Info

Publication number
EP0039363A1
EP0039363A1 EP19800902257 EP80902257A EP0039363A1 EP 0039363 A1 EP0039363 A1 EP 0039363A1 EP 19800902257 EP19800902257 EP 19800902257 EP 80902257 A EP80902257 A EP 80902257A EP 0039363 A1 EP0039363 A1 EP 0039363A1
Authority
EP
European Patent Office
Prior art keywords
hose
antistatic
tape
carbon black
hose according
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Withdrawn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
EP19800902257
Other languages
German (de)
English (en)
Inventor
Robert A. Alberts
Robert J. Mckenna
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.)
Polymer Corp
Original Assignee
Polymer Corp
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 Polymer Corp filed Critical Polymer Corp
Publication of EP0039363A1 publication Critical patent/EP0039363A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
    • F16L11/085—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more braided layers
    • F16L11/086—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more braided layers two layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
    • F16L11/127—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting electrically conducting
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges

Definitions

  • This invention relates to antistatic hose which has sufficient conductivity to prevent the accumulation of static electric charges .
  • a limited degree of conductivity is achieved by incorporating within the hose a sintered plastic strip filled with carbon black.
  • the hose of this invention is especially suitable for use in paint spray applications .
  • tube refers to a flexible polymeric inner tubular component of a hose that serves as an impervious conduit for the transmission of fluids.
  • reinforcement refers to one or more plies of high tenacity synthetic yarns or monofilaments that are applied in tensioned relationship (as by spiral wrapping, braiding, knitting or the like) over the tube to increase the burst strength and kink resistance of the tube.
  • cover refers to a con ⁇ tinuous protective layer of polymeric material that envelops the reinforcement.
  • thermoplastic hose refers to a composite structure adapted for the transmission of fluids under pressure, which includes a tube, a reinforcement, and a cover.
  • bonding refers to methods for adhering the several components of the hose to each other as through the use of heat, solvents, or adhesives .
  • thermoplastic hose is used for the transmission of volatile or combustible fluids. Since most thermo ⁇ plastic materials are essentially electrically non- conductive, it is a common practice in these applications to incorporate an element of at least limited conductiv ⁇ ity-within the body of the hose to permit grounding of the hose and the dissipation of static electric charges.
  • a typical application is a paint spray hose in which paints or lacquers are pumped through a flexible hose to a spray gun at relatively high pressures. In some recently developed commercial installations the pressures may reach as much as 700 kg/cm 2 . The flow of fluid materials through the hose may cause static electric charges to build up which, if not discharged to ground, can lead to an explosion of the volatile solvents or other paint vehicles.
  • thermoplastic hoses To avoid the danger of explosions or fire when inflammable fluids are transmitted through thermoplastic hoses, it is conventional to incorporate a conductive element within the wall of the hose.
  • conductive elements variously have been in the form of sinuous wires, both single strand and braided, helically wound conductive wires, flexible conductive elements made by interweaving elastic yarns and copper threads and, most recently, patent 4,059,847 discloses the use of a conductive layer of carbon particles laid down between overlying braided reinforcements.
  • OMPI_ WIP conductive materials such as a copper wire, for the grounding element. While good conductors function well in bleeding the static electric charges , they introduce a possible hazard in that the hose can conduct a sub- stantial current if contact is made with an electrical device.
  • thermoplastic hose that may be grounded to prevent the accumulation of static electric charges .
  • the tape is made from a heat sinterable plastic filled with finely divided carbon particles .
  • the heat sinterable plastic is pol tetrafluoroethylene, ultrahigh molecular weight polyethylene or other thermoplastic having a high melt viscosity.
  • the preferred carbon is a carbon black having a mean particle size of less than a micron and more preferably less than 1/10 of a micron.
  • the conductive tape (which can either be prepared in the form of a tape or small diameter beading) is located within the hose either between the cover and the outer reinforcement o?._r ⁇ layer, between the tube and an inner reinforcement layer, or, when one or more layers of reinforcement are used, between the several reinforcement layers.
  • the antistatic element can be made by blending finely divided carbon black with a powdered heat sinter ⁇ able plastic and forming a billet, as by compression molding or ram extrusion. It is preferred that the melt viscosity of the plastic be sufficiently high so that it will not flow above its melting point and encapsulate the carbon particles. It has been found that a product prepared by using a thermoplastic that has a high melt viscosity has a higher electrical conductivity than can be achieved through the use of a plastic that flows above its melting since a low melt viscosity plastic encapsulates the carbon particles.
  • a hose (or any other article) is generally considered sufficiently conductive to dissipate static electric charges if its total resistance is less than 10**- * ohms. While the length of hose will vary from application to application, ordinary industrial uses usually do not require a hose longer than 30 meters and, therefore, a resistance less than 10 6 ohms per linear 30 centimeters is an acceptable value for most applications.
  • the resistance of the preferred conductive element of this invention can be altered either by changing the amount of carbon black in the tape or the cross sectional area of the tape.
  • a resistance of about 1 to 2 x 10 ⁇ ohms per 30 cm is obtained. This value is sufficiently low to permit the use of lengths of hose in considerable excess of 30 meters and maintain a total resistance of less 10*-** ohms.
  • the cross-sectional configuration of the conductive element of this invention can vary from a small diameter bead to a thin strip but the configuration of a thin, flat tape is preferred. The reason for this is that a thin tape will best preserve the concentricity of a hose and have the least tendency to develop to weak spots in the hose.
  • a flat tape as, for example, a comparatively wide tape is more difficult to cut accidentally than is the case of a small diameter bead. Also, a tape may be more efficient in gathering static electric charges because of its larger contact area.
  • the drawing is a side view of a portion of an anti ⁇ static hose, partially broken away, assembled in accordance with this invention.
  • the hose 1 is comprised of a tube 2, a first braided layer 3, and a second braided layer 4.
  • a protective cover 5 is extruded over the second braided layer 4.
  • a conductive tape 6 is incorporated in the hose 1 between the first braided layer 3 and the second braided layer 4.
  • the conductive tape 6 is illustrated in the drawing covering approximately a quarter of the circumference of the hose but it should be noted that even wider tapes can be used.
  • carbon black (Shawinigan acetylene black) was blended into 8.3 kg of finely divided polytetra- fluoroethylene.
  • the carbon black had an electrical resistivity, at an apparent density of 0.7 grams/cc, of 0.05 ohm-inches and a bulk density at 50% compression of 0.1 grams/cc.
  • the mean particle size of the carbon black was between .04 and .05 microns.
  • the dry blended mixture was charged into a compression mold and placed in an oven at 370°C. for a period of 12 hours to obtain thermal equilibrium.
  • the mold was removed from the oven and placed in a press at a pressure of 200 kg/cm ⁇ until the mold cooled to room temperature.
  • the molded billet approximately 23 cm in diameter and 38 cm in length, was then skived and slit to provide a tape that was approximately 0.1 mm thick and 1.3 mm wide.
  • the resistivity of the tape so prepared was approximately 33,000 ohms per meter, its density was about 2.1, its tensile strength 150 kg/cm 2 and its elongation 175%.
  • a 6.4 mm OD nylon tube was extruded having a wall thickness of 7.6 mm.
  • a layer of high tenacity nylon fibers was then braided as a reinforcement over the tube.
  • the braid was solvent bonded to the tube using the method disclosed in U.S. Patent 2,977,839.
  • a second layer of high tenacity nylon fibers was then braided over the first braid layer while inserting a continuous length of conductive tape made as disclosed immediately above.
  • the hose construction was then com ⁇ pleted by applying a polyurethane cover of about .64 mm inches over the second braid and the cover was bonded to the braid using the method disclosed in U.S. Patent 3,489,631.
  • the completed hose had good concentricity with no objectionable bulges.
  • the resistance of the hose manufactured as above was measured to be between 33,000 and 66,000 ohms per linear meter.
  • the hose was then tested using a standard pressure pulse test. In this test, fittings are mounted on a two foot long sample of the hose and the assembly is subjected to pressure pulses at the rate of 35 cycles per minute in which the pressure during each cycle varies from 3.5 kg/cm 2 to 320 kg/cm 2 . This test is run at a temperature of 50°C.
  • a flex test was superimposed upon the above pressure pulse test by bending the length of hose being tested into a U-shape and changing the bend radius at a rate of 60 cycles per minute at the same time the hose was being pressure pulsed.
  • the bend radius of the hose was changed by moving one fitting through a 20 cm stroke for each cycle in which one fitting was moved alternately from a point 15 cm from the fixed fitting to a position in which it was 36 cm from the fixed fitting.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)

Abstract

Un tuyau en plastique de conductivite limitee est concu pour expulser les charges electriques statiques telles que celles qui se produisent dans l'atomisation de peinture. Le tuyau possede un tube conventionnel (2), un renforcement (3 et 4) et une enveloppe (5). Le nouvel element est un element de drainage d'electricite statique (6) monte entre deux composants du tuyau et consistant en une bande ou bourrelet fabrique avec un materiau thermoplastique frittable a la chaleur rempli de noir de carbone.
EP19800902257 1979-10-16 1980-10-15 Tuyau thermoplastique antistatique Withdrawn EP0039363A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8538679A 1979-10-16 1979-10-16
US85386 2002-02-28

Publications (1)

Publication Number Publication Date
EP0039363A1 true EP0039363A1 (fr) 1981-11-11

Family

ID=22191288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800902257 Withdrawn EP0039363A1 (fr) 1979-10-16 1980-10-15 Tuyau thermoplastique antistatique

Country Status (2)

Country Link
EP (1) EP0039363A1 (fr)
WO (1) WO1981001227A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL100114C (fr) * 1981-07-06 1962-01-15
DE4110279A1 (de) * 1991-03-28 1992-10-01 Alfo Ag Lichtleiter
IT1287373B1 (it) * 1996-12-06 1998-08-04 Fitt Spa Tubo flessibile antistatico.
AUPP228298A0 (en) 1998-03-12 1998-04-09 Spiral Guard Australia Pty Ltd A sheath
ITPR20090035A1 (it) * 2009-05-08 2010-11-09 Atma Flex S R L Tubazione rinforzata conduttiva per liquidi, soluzioni chimiche, vernici, oli e gas
DE102011017811A1 (de) * 2011-04-29 2012-10-31 Evonik Degussa Gmbh Temperierbare Rohrleitung für Offshoreanwendungen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042737A (en) * 1960-05-20 1962-07-03 Moore & Co Samuel Hose assembly incorporating a ground wire
US3828112A (en) * 1973-03-14 1974-08-06 Moore & Co Samuel Composite hose for conductive fluid
US4059847A (en) * 1976-09-01 1977-11-22 Dayco Corporation Hose having an electrically conductive layer for dissipating static electricity and method of making same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8101227A1 *

Also Published As

Publication number Publication date
WO1981001227A1 (fr) 1981-04-30

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH DE FR GB LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19811123

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ALBERTS, ROBERT A.

Inventor name: MCKENNA, ROBERT J.