FR2374153A1 - Porous PTFE articles esp. bands prodn. - by sintering particulate PTFE and rotationally machining a band off - Google Patents

Porous PTFE articles esp. bands prodn. - by sintering particulate PTFE and rotationally machining a band off

Info

Publication number
FR2374153A1
FR2374153A1 FR7737212A FR7737212A FR2374153A1 FR 2374153 A1 FR2374153 A1 FR 2374153A1 FR 7737212 A FR7737212 A FR 7737212A FR 7737212 A FR7737212 A FR 7737212A FR 2374153 A1 FR2374153 A1 FR 2374153A1
Authority
FR
France
Prior art keywords
ptfe
mould
oven
porous
sintering
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.)
Granted
Application number
FR7737212A
Other languages
French (fr)
Other versions
FR2374153B1 (en
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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
Priority claimed from GB5301976A external-priority patent/GB1567055A/en
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of FR2374153A1 publication Critical patent/FR2374153A1/en
Application granted granted Critical
Publication of FR2374153B1 publication Critical patent/FR2374153B1/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/28—Splitting layers from work; Mutually separating layers by cutting
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
    • B29C67/205—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising surface fusion, and bonding of particles to form voids, e.g. sintering
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/24—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by surface fusion and bonding of particles to form voids, e.g. sintering
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/006—Pressing and sintering powders, granules or fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

Porous PTFE articles are mfd. by charging particulate PTFE to a mould, in bulk density such that the charge is non-self-supporting; placing mould with charge into an oven held at between gel point of the PTFE and 475 degrees C; and sintering the polymer in the mould while still in the oven to cause the particle to adhere together. A porous PTFE web is mfd. by moulding a cylinder according to this process; rotating the resulting cylinder upon a lathe and producing the intended porous web by helically shaving a continuous sliver using a knife. Specifically, the oven temp. is 360-400 degrees C. The mould is kept in the oven so long that all PTFE particles reach or exceed gel temp. The mould is chosen so that one of its dimensions is 25mm. It is kept in the oven for 1-2 hr. When sintering is complete it is cooled to room temp.
FR7737212A 1976-12-20 1977-12-09 Porous PTFE articles esp. bands prodn. - by sintering particulate PTFE and rotationally machining a band off Granted FR2374153A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB5302076 1976-12-20
GB5301976A GB1567055A (en) 1976-12-20 1976-12-20 Method of making articles of porous polytetrafluorothylene

Publications (2)

Publication Number Publication Date
FR2374153A1 true FR2374153A1 (en) 1978-07-13
FR2374153B1 FR2374153B1 (en) 1980-08-22

Family

ID=26267178

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7737212A Granted FR2374153A1 (en) 1976-12-20 1977-12-09 Porous PTFE articles esp. bands prodn. - by sintering particulate PTFE and rotationally machining a band off

Country Status (4)

Country Link
JP (1) JPS5378269A (en)
DE (1) DE2756644C2 (en)
FR (1) FR2374153A1 (en)
IT (1) IT1114693B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541693A1 (en) * 1983-02-28 1984-08-31 Chemplast Inc PROCESS AND APPARATUS FOR MANUFACTURING FLUOROCARBON RESIN FILAMENTS
EP0247771A1 (en) * 1986-05-29 1987-12-02 National Research Development Corporation Porous PTFE

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6434408A (en) * 1987-07-30 1989-02-03 Toray Industries Porous membrane of polytetrafluoroethylene-base resin and production thereof
JPS6434407A (en) * 1987-07-30 1989-02-03 Toray Industries Porous membrane of polytetrafluoroethylene-base resin and production thereof
AT501770B1 (en) * 2005-04-07 2007-10-15 Michel Wolfgang Ing METHOD FOR PRODUCING A PROFILED TRAIL FROM POLYTETRAFLUOROETHYLENE
DE102007019447B4 (en) * 2007-04-25 2009-05-07 Spinner Gmbh High frequency device with low dielectric losses
US20110200813A1 (en) * 2008-10-23 2011-08-18 Kaneka Corporation Process for producing thermoplastic resin foam film and thermoplastic resin foam film
DE102009020621B4 (en) * 2009-05-09 2011-03-03 Fecken-Kirfel Gmbh & Co. Kg Film peeling method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR920221A (en) * 1944-09-20 1947-04-01 Du Pont Process for shaping polytetrafluoroethylene objects, resulting products and their applications

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1199972B (en) * 1956-11-20 1965-09-02 Montedison Spa Process for the production of micro-porous, gas-permeable products from polytetrafluoroethylene
DE1115441B (en) * 1958-02-01 1961-10-19 Ewald Merkel Dipl Ing Method and device for manufacturing hollow bodies, in particular porous ones, from materials based on polyhalohydrocarbons using sintering
DE1769315C3 (en) * 1968-05-07 1973-09-13 Farbwerke Hoechst Ag, Vormals Meister Lucius & Bruening, 6000 Frankfurt Foams made from tetrafluoroethylene polymers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR920221A (en) * 1944-09-20 1947-04-01 Du Pont Process for shaping polytetrafluoroethylene objects, resulting products and their applications

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541693A1 (en) * 1983-02-28 1984-08-31 Chemplast Inc PROCESS AND APPARATUS FOR MANUFACTURING FLUOROCARBON RESIN FILAMENTS
EP0247771A1 (en) * 1986-05-29 1987-12-02 National Research Development Corporation Porous PTFE

Also Published As

Publication number Publication date
JPS5378269A (en) 1978-07-11
IT1114693B (en) 1986-01-27
DE2756644C2 (en) 1982-08-12
FR2374153B1 (en) 1980-08-22
DE2756644A1 (en) 1978-06-22

Similar Documents

Publication Publication Date Title
IT1115545B (en) PROCEDURE FOR THE PRODUCTION OF CABLE BODIES MADE OF THERMOPLASTIC ARTIFICIAL MATERIAL WITH UNIFORM PARIETAL THICKNESS AND DEVICE FOR IMPLEMENTING THE PROCEDURE
IL43231A0 (en) Process and apparatus for continuously extruding coated section members,particularly formed of thermoplastic materials
EP0030664A3 (en) Pourable sinter powder with particular properties based on tetrafluorethylene polymers, and process for their preparation
AU468664B2 (en) Method of and apparatus for producing tubular bodies of thermoplastic synthetic resin material
FR2374153A1 (en) Porous PTFE articles esp. bands prodn. - by sintering particulate PTFE and rotationally machining a band off
ES447113A1 (en) Method of molding polytetrafluoroethylene
GB2053788B (en) Extruder for producing particles of expanded foodstuff material
IL54705A (en) Process for producing metallic articles including particles of thermoplastic polymeric material
PT71333A (en) Process and device for the manufacture of moldings from synthetic foamable thermoplastic materials
FR2228588A1 (en) Thermoplastic waste reprocessed from fibres or shreds - by extruding through narrow ducts to cause partial fusion
ES8308251A1 (en) Moulds conceived for making objects of expanded non-polar plastics using ultra-high frequency radiation.
AU464906B2 (en) Method for forming and vulcanizing vulcanizable materials and articles vulcanized thereby
EP0228654A3 (en) Method of producing multicoloured flat articles of thermoplastics materials
CA1017514A (en) Method and apparatus for pre-conditioning solid particle resin material for plastic forming
ES320526A1 (en) Improvements in or relating to a double layer sintered product
BE829194A (en) PROCESS FOR THE MOLDING OF OBJECTS IN PLASTIC MATERIAL AND MOLDS SUITABLE FOR ITS REALIZATION
IL33950A (en) Thermosetting resin moulding material,method of producing the same and articles moulded therefrom
CA996781A (en) Mould for manufacturing plastic articles, and method of manufacturing the mould
CA1019126A (en) Method of moulding an article from resin-impregnated material
BR7505222A (en) PHOTOCHROMIC PARTICLES, PHOTOCHROMIC PLASTIC MATERIAL AND PROCESS FOR THE PRODUCTION OF THE ULTIMATE
AU476239B2 (en) Method and apparatus for the production of thermoplastic mouldings with a solid skin and a cellular core
CA1023100A (en) Process for producing polyethylene resin particles and foamable polyethylene resin particles
IT962841B (en) PROCEDURE FOR MANUFACTURING SMOOTH SHAPED PARTS OF ARTIFICIAL MATERIAL FROM ARTIFICIAL MATERIALS WITH PERFORMANCE IN PARTICULAR PROPELLEN T BY INJECTION MOLDING OR MOLD SUITABLE FOR THE IMPLEMENTATION OF THE PROCEDURE AND SHAPED PART PRODUCED ACCORDING TO THE PROCESS
FR2263099A1 (en) Screw extruder for explosive powders - e.g. for use as fuses, with plastic extrusion cylinder and/or screw
JPS5337762A (en) Process and apparatus for continuous production of thermoplastic resin composition for molding

Legal Events

Date Code Title Description
ST Notification of lapse