GB726911A - Improvements in or relating to a method and apparatus for making polyamide rod stock - Google Patents

Improvements in or relating to a method and apparatus for making polyamide rod stock

Info

Publication number
GB726911A
GB726911A GB5358/52A GB535852A GB726911A GB 726911 A GB726911 A GB 726911A GB 5358/52 A GB5358/52 A GB 5358/52A GB 535852 A GB535852 A GB 535852A GB 726911 A GB726911 A GB 726911A
Authority
GB
United Kingdom
Prior art keywords
tube
polyamide
cooling
rate
entrance
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
GB5358/52A
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 GB726911A publication Critical patent/GB726911A/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
    • B29C48/03—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
    • B29C48/022—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

Abstract

726,911. Extruding polyamide. POLYMER CORPORATION. Feb. 29, 1952 [March 13, 1951], No. 5358/52. Class 87 (2) Elongated shapes, such as rods C, are formed from a high-melting polyamide by feeding the material towards the open end of an elongated tube 20 and cooling it at a rate sufficient to effect solidification throughout a major portion of its cross-section prior to emergence at the discharge end of the tube, the polyamide being under pressure sufficiently high to fill the entrance end of the tube and to cause pressure to be exerted against the tube wall at this point. The polyamide is first dried, preferably by warming under vacuum, then delivered by means of a hopper 18 to a screw-feeder 16 heated by elements 19, where it is melted and fed through a perforated breakerplate (not shown) to the tube 20. The tube may be cooled by means of a water-cooling coil 21. As the polyamide advances along the tube it solidifies radially inwardly and shrinks from the tube wall. The rate of feed and the rate of cooling are so adjusted that the frictional engagement of the solidified annulus near the entrance of the tube causes a substantial pressure to be maintained in the molten material and thus prevents development of porosity due to shrinkage. Small quantities of fillers, e.g. graphite, anti-oxidants or modifiers, may be added to the polyamide. To initiate the extruding process the tube is provided with a plug which is initially placed in the entrance end of the tube and is forced towards the exit end by the advancing polyamide.
GB5358/52A 1951-03-13 1952-02-29 Improvements in or relating to a method and apparatus for making polyamide rod stock Expired GB726911A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US726911XA 1951-03-13 1951-03-13

Publications (1)

Publication Number Publication Date
GB726911A true GB726911A (en) 1955-03-23

Family

ID=22109196

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5358/52A Expired GB726911A (en) 1951-03-13 1952-02-29 Improvements in or relating to a method and apparatus for making polyamide rod stock

Country Status (1)

Country Link
GB (1) GB726911A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237237B (en) * 1989-01-10 1992-09-30 Nat Res Dev Improvements in or relating to methods and apparatus for the continuous formation of an extruded product

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237237B (en) * 1989-01-10 1992-09-30 Nat Res Dev Improvements in or relating to methods and apparatus for the continuous formation of an extruded product

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