GB975633A - Method and apparatus for making polytetrafluoroethylene tubing - Google Patents
Method and apparatus for making polytetrafluoroethylene tubingInfo
- 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
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.
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)
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 |
-
1961
- 1961-10-09 GB GB36162/61A patent/GB975633A/en not_active Expired
Cited By (4)
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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