GB656300A - Production of rods, tubes and the like from polytetrafluorethylene - Google Patents

Production of rods, tubes and the like from polytetrafluorethylene

Info

Publication number
GB656300A
GB656300A GB25684/48A GB2568448A GB656300A GB 656300 A GB656300 A GB 656300A GB 25684/48 A GB25684/48 A GB 25684/48A GB 2568448 A GB2568448 A GB 2568448A GB 656300 A GB656300 A GB 656300A
Authority
GB
United Kingdom
Prior art keywords
mandrel
pellet
tube
plunger
tool
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
GB25684/48A
Inventor
Stanley Thomas Deakin
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.)
British Mechanical Productions Ltd
Original Assignee
British Mechanical Productions 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
Application filed by British Mechanical Productions Ltd filed Critical British Mechanical Productions Ltd
Priority to GB25684/48A priority Critical patent/GB656300A/en
Publication of GB656300A publication Critical patent/GB656300A/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
    • 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
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/08—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polymers of halogenated hydrocarbons
    • D01F6/12—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polymers of halogenated hydrocarbons from polymers of fluorinated hydrocarbons
    • 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
    • B29C48/06—Rod-shaped
    • 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
    • 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)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

656,300. Moulding polytetrafluorethylene. BRITISH MECHANICAL PRODUCTIONS, Ltd. Oct. 1, 1948, No. 25684. [Class 87 (ii)] Rods, tubes and like elongated articles are produced by preparing a polytetrafluorethylene pellet of rod or tube-like form by compacting the material in powdered, granulated or flocculent form, sintering the compacted material at above 327‹ C., and then extruding the pellet to decrease its cross-sectional dimension with a corresponding increase in length, To avoid disintegration of the pellet, the reduction in cross-sectional dimension may be limited to one-half. The extrusion may be carried out at a temperature below that at which the material becomes substantially elastic, e.g. normal atmospheric temperature, or at a temperature higher than that at which the material becomes elastic, in which latter case the material is constrained in the extruded form during cooling. The articles produced by the invention are under internal stress, and by releasing this stress they can be restored in part to the original shape of the pellet. The release may be effected successively along the length of the article, to produce in effect one or more local increases in cross-section dimension. The release may be effected by heating or by mechanical means such as shock, vibration or bending. The drawing shows an apparatus for extruding tubes, comprising a body 1 having a socket 2 in which the pellet is placed, a bottom die 3 having a bore 4 into which the pellet is to be extruded, and a top tool 5 which carries a plunger 6 and mandrel 7. The plunger and mandrel are removably held in the tool by a spring-pressed pin 8 which is forced inwardly by a ramp 9 as the body and tool are brought together. In use, a succession of pellets are placed in socket 2, the mandrel 7 is pushed through them, and the pellets are successively extruded into bore 4 by pressure of plunger 6 on the uppermost pellet. To extract the tube, the top tool is removed, carrying with it the mandrel and tube, the pin 8 releases the mandrel, the mandrel is withdrawn carrying the tube, and the tube is removed from the mandrel. Specification 592,127 is referred to.
GB25684/48A 1948-10-01 1948-10-01 Production of rods, tubes and the like from polytetrafluorethylene Expired GB656300A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB25684/48A GB656300A (en) 1948-10-01 1948-10-01 Production of rods, tubes and the like from polytetrafluorethylene

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25684/48A GB656300A (en) 1948-10-01 1948-10-01 Production of rods, tubes and the like from polytetrafluorethylene

Publications (1)

Publication Number Publication Date
GB656300A true GB656300A (en) 1951-08-22

Family

ID=10231623

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25684/48A Expired GB656300A (en) 1948-10-01 1948-10-01 Production of rods, tubes and the like from polytetrafluorethylene

Country Status (1)

Country Link
GB (1) GB656300A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161802A2 (en) * 1984-04-13 1985-11-21 National Research Development Corporation Solid phase deformation process
US5096654A (en) * 1987-07-24 1992-03-17 The National Research And Development Corporation Solid phase deformation process
CN105133064A (en) * 2015-08-31 2015-12-09 江苏泓彦塑料制品有限公司 Preparation method for PTFE short fiber
CN113480817A (en) * 2021-06-11 2021-10-08 湖北宇辰新材料有限公司 Preparation method of polytetrafluoroethylene rod

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161802A2 (en) * 1984-04-13 1985-11-21 National Research Development Corporation Solid phase deformation process
EP0161802A3 (en) * 1984-04-13 1986-01-08 National Research Development Corporation Solid phase deformation process
US4938913A (en) * 1984-04-13 1990-07-03 National Research Development Corporation Solid phase deformation process
US5096654A (en) * 1987-07-24 1992-03-17 The National Research And Development Corporation Solid phase deformation process
CN105133064A (en) * 2015-08-31 2015-12-09 江苏泓彦塑料制品有限公司 Preparation method for PTFE short fiber
CN105133064B (en) * 2015-08-31 2017-06-20 江苏泓彦塑料科技有限公司 A kind of preparation method of PTFE chopped fibers
CN113480817A (en) * 2021-06-11 2021-10-08 湖北宇辰新材料有限公司 Preparation method of polytetrafluoroethylene rod

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