Patent US2163411A successfully refreshed from Google Patents.
EP0157601A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Tubular materials
Assignee: BTG International Ltd
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Filing: 1985-03-28
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Granted: —
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Expires: 2005-03-28
Abstract
Abstract A process for the deformation of a hollow workpiece comprising an orientable, thermoplastic polymer by passage in the solid phase through a die having both an entry side and an exit side, which process comprises providing the hollow workpiece at the entry side of the die; applying to the hollow workpiece from the exit side of the die a tension insufficient to cause tensile failure of the workpiece but sufficient to deform the hollow workpiece by drawing it with reduction in its bulk cross-sectional area in the solid phase simultaneously through the die and over an internally positioned former having a cross-sectional area greaterthan the initial internal coss-sectional area of the hollow workpiece; and collecting the deformed hollow workpiece from the exit side of the die.
Inventors
- 👤 Ian Macmillan Ward
- 👤 Alan Selwood
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 13:26
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/30; B29C55/22; B29C55/26; B29K; B29K2027/00; B29K2027/12
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
127 words
A process for the deformation of a hollow workpiece comprising an orientable, thermoplastic polymer by passage in the solid phase through a die having both an entry side and an exit side, which process comprises providing the hollow workpiece at the entry side of the die; applying to the hollow workpiece from the exit side of the die a tension insufficient to cause tensile failure of the workpiece but sufficient to deform the hollow workpiece by drawing it with reduction in its bulk cross-sectional area in the solid phase simultaneously through the die and over an internally positioned former having a cross-sectional area greater than the initial internal cross-sectional area of the hollow workpiece; and collecting the deformed hollow workpiece from the exit side of the die.
Claim 2
Dependent Claim
127 words
A process for the deformation of a hollow workpiece comprising an orientable, thermoplastic polymer by passage in the solid phase through a die having both an entry side and an exit side, which process comprises providing the hollow workpiece at the entry side of the die; applying to the hollow workpiece from the exit side of the die a tension insufficient to cause tensile failure of the workpiece but sufficient to deform the hollow workpiece by drawing it with reduction in its bulk cross-sectional area in the solid phase simultaneously through the die and over an internally positioned former having a cross-sectional area greater than the initial internal cross-sectional area of the hollow workpiece; and collecting the deformed hollow workpiece from the exit side of the die.
Claim 3
Dependent Claim
17 words
A process according to Claim 1 wherein the polymer comprising the hollow workpiece is a semicrystalline polymer.
Claim 4
Dependent Claim
28 words
A process according to Claim 2 wherein the polymer is an unsubstituted or mono- or poly halo-substituted vinyl polymer, unsubstituted or hydroxy-substituted polyester, a polyamide or a polyacetal.
Claim 5
Dependent Claim
23 words
A process according to Claim 3 wherein the polymer is a linear homo-or copolymer of ethylene or propylene with at least on comonomer.
Claim 6
Dependent Claim
24 words
A process according to Claim 4 wherein the polymer is a linear homo- or copolymer of ethylene of M w from 50,000 to 500,000.
Claim 7
Dependent Claim
25 words
A process according to Claim 5 wherein the hollow workpiece is heated to a temperature within 60 C below the melting point of the polymer.
Claim 8
Dependent Claim
24 words
A process according to Claim 4 wherein the polymer is a linear homo- or copolymer of propylene of M w from 150,000 to 800,000.
Claim 9
Dependent Claim
20 words
A process according t Claim 7 wherein the hollow workpiece is heated to a temperature from 20 C to 170°C.
Claim 10
Dependent Claim
12 words
A process according to Claim 3 wherein the polymer is a polyoxymethylene.
Claim 11
Dependent Claim
20 words
A process according to Claim 9 wherein the hollow workpiece is heated to a temperature from 80°C to 170 C.
Claim 12
Dependent Claim
14 words
A process according to Claim 3 wherein the polymer is a vinylidene fluoride polymer.
Claim 13
Dependent Claim
22 words
A process according to Claim 11 wherein the hollow workpiece is heated to a temperature from 80 C to 16 5 C.
Claim 14
Dependent Claim
12 words
A process according to Claim 3 wherein the polymer is a polyester.
Claim 15
Dependent Claim
24 words
A process according to Claim 13 wherein the hollow workpiece is heated to a temperature from 5 5 0 C to 12 0 C.
Claim 16
Dependent Claim
14 words
A process according to any preceding claim wherein the hollow workpiece comprises a filler.
Claim 17
Dependent Claim
16 words
A process according to any preceding claim wherein the hollow workpiece is essentially unoriented before deformation.
Claim 18
Dependent Claim
20 words
A process according to any preceding claim wherein the hollow workpiece is an open-ended elongate workpiece of substantially constant cross-section.
Claim 19
Dependent Claim
15 words
A process according to Claim 17 wherein the hollow workpiece has an axis of symmetry.
Claim 20
Dependent Claim
19 words
A process according to Claim 18 wherein the hollow workpiece has a circular, elliptical, square, rectangular or triangular cross-section.
Claim 21
Dependent Claim
40 words
A process according to any preceding claim wherein at the die and, optionally, downstream therefrom there is positioned within the hollow workpiece a former having a cross-sectional area of at least the initial internal cross-sectional area of the hollow workpiece.
Claim 22
Dependent Claim
12 words
A process according to any preceding claim wherein the die is heated.
Claim 23
Dependent Claim
21 words
A process according to any preceding claim wherein the oriented thermoplastic material passes through a heated chamber downstream from the die.
Claim 24
Dependent Claim
29 words
A process according to any preceding claim wherein the hollow workpiece is drawn through the die in the solid phase at a nominal deformation ratio of at least 3:1.
Claim 25
Dependent Claim
16 words
A process according to Claim 23 wherein the draw speed is greater than 50 cm min.
Claim 26
Dependent Claim
11 words
A process according to Claim 23 or 24 which is continuous.
Claim 27
Dependent Claim
13 words
A toughened oriented polymer material prepared by the process of any preceding claim.
References Cited (Backward Citations)
No citation records indexed.
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