GB975633A - Method and apparatus for making polytetrafluoroethylene tubing - Google Patents

Method and apparatus for making polytetrafluoroethylene tubing

Info

Publication number
GB975633A
GB975633A GB36162/61A GB3616261A GB975633A GB 975633 A GB975633 A GB 975633A GB 36162/61 A GB36162/61 A GB 36162/61A GB 3616261 A GB3616261 A GB 3616261A GB 975633 A GB975633 A GB 975633A
Authority
GB
United Kingdom
Prior art keywords
mandrel
die
annular
billet
fibres
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.)
Expired
Application number
GB36162/61A
Inventor
Winton Lloyd Slade
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.)
Raybestos Manhattan Inc
Original Assignee
Raybestos Manhattan Inc
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 Raybestos Manhattan Inc filed Critical Raybestos Manhattan Inc
Priority to GB36162/61A priority Critical patent/GB975633A/en
Publication of GB975633A publication Critical patent/GB975633A/en
Expired 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
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams
    • 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
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C48/03—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
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • 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
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

975,633. Moulding polytetrafluoroethylene tubing. RAYBESTOS-MANHATTAN Inc. Oct. 9, 1961, No. 36162/61. Heading B5A. In a method of forming polytetrafluoroethylene tubing, having an improved resistance to seepage by low viscosity fluids, an annular billet, comprising finely divided polytetrafluoroethylene particles and a volatile extrusion aid, e.g. white oil or naphtha, is forced by a ram 18 between a hollow mantle 10 and a mandrel 15 and through an annular space bounded by a tapered circular surface 12 of the die, and mandrel 15 in which the cross-sectional area of the preform is reduced by at least 90%, thus forming the resin particles into longitudinally extending fibres, the outer and inner layer fibres then being displaced in opposite directions relative to each other by means of grooves 16 and 19 in the mandrel and the die, the crosssectional area in this grooved region up to the cylindrical annular die formed by opposed surfaces 14, 17 being further reduced by between 50 and 95%, thus making the respective surface layer fibres lie at an angle of at least 15 degrees with respect to each other, passing said billet through said annular die opening to form a tube, removing the extrusion aid, and sintering the tube. There may be provided rotational movement between the die and the mandrel, or the latter may remain in fixed relationship. Alternative apparatus is described with reference to Figs. 3 and 5 (not shown), the latter being for the wall tubes of large diameter.
GB36162/61A 1961-10-09 1961-10-09 Method and apparatus for making polytetrafluoroethylene tubing Expired GB975633A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB36162/61A GB975633A (en) 1961-10-09 1961-10-09 Method and apparatus for making polytetrafluoroethylene tubing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB36162/61A GB975633A (en) 1961-10-09 1961-10-09 Method and apparatus for making polytetrafluoroethylene tubing

Publications (1)

Publication Number Publication Date
GB975633A true GB975633A (en) 1964-11-18

Family

ID=10385545

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36162/61A Expired GB975633A (en) 1961-10-09 1961-10-09 Method and apparatus for making polytetrafluoroethylene tubing

Country Status (1)

Country Link
GB (1) GB975633A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197870A (en) * 1986-11-13 1988-06-02 Gore & Ass Apparatus and method for extruding and expanding polytetrafluoroethylene tubing and the products produced thereby
DE102006035960A1 (en) * 2006-08-02 2008-02-07 Biotronik Vi Patent Ag Device for producing stranded goods
CN114261032A (en) * 2021-12-22 2022-04-01 江苏百择高分子有限公司 Multiple color matching and cold press molding process for producing teflon

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197870A (en) * 1986-11-13 1988-06-02 Gore & Ass Apparatus and method for extruding and expanding polytetrafluoroethylene tubing and the products produced thereby
DE102006035960A1 (en) * 2006-08-02 2008-02-07 Biotronik Vi Patent Ag Device for producing stranded goods
EP1884341A3 (en) * 2006-08-02 2011-11-16 Biotronik VI Patent AG Method for manufacturing strand shaped articles
CN114261032A (en) * 2021-12-22 2022-04-01 江苏百择高分子有限公司 Multiple color matching and cold press molding process for producing teflon

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