GB883702A - Process and apparatus for stretching thermoplastic sheet material - Google Patents

Process and apparatus for stretching thermoplastic sheet material

Info

Publication number
GB883702A
GB883702A GB33715/59A GB3371559A GB883702A GB 883702 A GB883702 A GB 883702A GB 33715/59 A GB33715/59 A GB 33715/59A GB 3371559 A GB3371559 A GB 3371559A GB 883702 A GB883702 A GB 883702A
Authority
GB
United Kingdom
Prior art keywords
sheet
gripped
heated
edges
whilst
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
GB33715/59A
Inventor
Paul Herminghaus Bottoms
Robert Jessup Clapp
Reuben Henry Loggins
John Gilbert Stansbury
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.)
GKN Aerospace Transparency Systems Inc
Original Assignee
Swedlow 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 Swedlow Inc filed Critical Swedlow Inc
Publication of GB883702A publication Critical patent/GB883702A/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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/16—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial simultaneously
    • B29C55/165—Apparatus 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

883,702. Stretching thermoplastic sheets. SWEDLOW Inc. Oct. 5, 1959, No. 33715/59. Class 87(2). [Also in Group XIII] To improve the physical (including optical) properties of a sheet of thermoplastic resin, e.g. polymethyl methacrylate, it is gripped at its edges and cooled at the points where it is gripped, whilst the rest of the sheet is heated and stretched. A sheet 24 is perforated at its edges and gripped by spring clips 51 which surround tubes 47 passing through the perforations. Each clip has flanges 50, 52 extending on each side of the sheet. The sheet suspended from a frame 30 is run into an oven where it is heated by hot air, whilst the parts where it is gripped are cooled by circulating cooling fluid through the pipes 47. Alternatively, it may be heated by infra-red heaters or in a fluid bath of oil or glycerine. After heating, the sheet is removed from the frame 30, and is secured by pins 102, Fig. 9, to cables 90 which are pulled by hydraulically operated pistons to stretch the sheet. The sheet may be heated during stretching by a hot air oven. In a modification, the sheet may be gripped by eccentric clamps with serrated edges. The sheet may be moulded by hot dies, blowing or suction whilst still hot. To compensate for the shrinkage due to cooling, the stretching force may be reduced slightly. The Specification includes several examples, giving the temperatures, and duration of and percentage stretch.
GB33715/59A 1959-10-27 1959-10-05 Process and apparatus for stretching thermoplastic sheet material Expired GB883702A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES0065583 1959-10-27

Publications (1)

Publication Number Publication Date
GB883702A true GB883702A (en) 1961-12-06

Family

ID=7498148

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33715/59A Expired GB883702A (en) 1959-10-27 1959-10-05 Process and apparatus for stretching thermoplastic sheet material

Country Status (3)

Country Link
US (1) USRE24978E (en)
DE (1) DE1404494B2 (en)
GB (1) GB883702A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2023166A3 (en) * 2007-08-08 2009-03-11 Rohm and Haas Denmark Finance A/S Optical Element Comprising Restrained Asymmetrical Diffuser

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3501398A1 (en) * 1985-01-17 1986-07-17 Schott Glaswerke, 6500 Mainz METHOD FOR INCREASING THE PLANITY OF FILMS
US5795267A (en) * 1995-07-21 1998-08-18 Playsmart, Inc. Pre-tensioned floor system
US8342492B2 (en) * 2007-08-24 2013-01-01 Nexolve Corporation Devices for reducing or eliminating defects in polymer workpieces
US7785517B2 (en) * 2007-08-24 2010-08-31 Nexolve Corporation Methods for reducing or eliminating defects in polymer workpieces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2023166A3 (en) * 2007-08-08 2009-03-11 Rohm and Haas Denmark Finance A/S Optical Element Comprising Restrained Asymmetrical Diffuser

Also Published As

Publication number Publication date
USRE24978E (en) 1961-05-02
DE1404494B2 (en) 1972-01-20
DE1404494A1 (en) 1968-10-03

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