GB739436A - Improvements in drawing sheet plastic - Google Patents

Improvements in drawing sheet plastic

Info

Publication number
GB739436A
GB739436A GB4485/54A GB448554A GB739436A GB 739436 A GB739436 A GB 739436A GB 4485/54 A GB4485/54 A GB 4485/54A GB 448554 A GB448554 A GB 448554A GB 739436 A GB739436 A GB 739436A
Authority
GB
United Kingdom
Prior art keywords
sheet
polyethylene
rubber
drawn
mould
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
GB4485/54A
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.)
Uniroyal Inc
Original Assignee
United States Rubber Co
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 United States Rubber Co filed Critical United States Rubber Co
Publication of GB739436A publication Critical patent/GB739436A/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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/28—Component parts, details or accessories; Auxiliary operations for applying pressure through the wall of an inflated bag or diaphragm
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
    • B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

739,436. Drawing sheet plastic to form containers &c. UNITED STATES RUBBER CO. Feb. 16, 1954 [April 6, 1953], No. 4485/54. Class 87 (2). A thin sheet (e.g. 0.05 inches thick) of a plastic material which normally ruptures or thins unevenly when drawn (e.g. polyethylene, polyvinylidene chloride) is adhered to a cured elastic rubber or synthetic rubber sheet 2, less than 0.05 inches thick by pressing between flat platens 3 and 4 (see Fig. 1). The resulting laminate is heated, in the case of polyethylene, to 210- 230‹ F. and drawn to the desired shape, after which it is cooled and the rubber stripped from the shaped plastic. When drawing polyethylene the initial laminate may be formed by drawing a vacuum at the interface between the polyethylene and the rubber. The face of the rubber sheet adjacent the plastic sheet may have a coating of a silicone oil. Gas under pressure may be used to force the laminate into conformity with a mould, and vacuum within the mould may be employed in addition, or it may be drawn as in Fig. 3 in which the plug 13 forces the sheet 1, 2 held by C-clamps 12 to the dotted line position. "Snap-back" drawing methods in which the sheet laminate is deformed by differential gas pressure beyond the shape desired and the gas pressure adjusted to allow the sheet to retract into conformity with an inserted shape may also be used or a "leader plug" forming operation in which a plug is used to push the sheet into a mould and differential gas pressure then used to carry the sheet beyond the plug into conformity with the interior of the mould. In an example, a polyethylene hemisphere 4 inches in diameter was drawn from a sheet of polyethylene as follows: a cured sheet of gum stock rubber 0.02 inches thick was affixed to a sheet of polyethylene 0.02 inches thick and the assembly was heated to 210‹ F. and drawn by vacuum to hemispherical shape, cooled, and the rubber sheet stripped from the shell. The invention may be applied to making such hollow articles as shoes, one-piece containers, to drawing very thin sheets from thicker ones produced in a calender or extruder or to expanding plastic tubes to form linings inside pipes.
GB4485/54A 1953-04-06 1954-02-16 Improvements in drawing sheet plastic Expired GB739436A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US739436XA 1953-04-06 1953-04-06

Publications (1)

Publication Number Publication Date
GB739436A true GB739436A (en) 1955-10-26

Family

ID=22116743

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4485/54A Expired GB739436A (en) 1953-04-06 1954-02-16 Improvements in drawing sheet plastic

Country Status (1)

Country Link
GB (1) GB739436A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470291A (en) * 1966-06-30 1969-09-30 Shell Oil Co Forming thermoplastic articles
US3546221A (en) * 1966-06-30 1970-12-08 Shell Oil Co Forming thermoplastic articles
US4141771A (en) 1976-04-28 1979-02-27 Imperial Chemical Industries Limited Method of thermoforming
WO2012095247A2 (en) 2011-01-12 2012-07-19 Unilever Plc Process for producing infusion packets
CN110450391A (en) * 2018-05-07 2019-11-15 嘉兴优逸客智能家居有限公司 The production method of integral type bag multiple layer combination body

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470291A (en) * 1966-06-30 1969-09-30 Shell Oil Co Forming thermoplastic articles
US3546221A (en) * 1966-06-30 1970-12-08 Shell Oil Co Forming thermoplastic articles
US4141771A (en) 1976-04-28 1979-02-27 Imperial Chemical Industries Limited Method of thermoforming
US4220683A (en) 1976-04-28 1980-09-02 Imperial Chemical Industries Limited Method of thermoforming and product made therefrom
WO2012095247A2 (en) 2011-01-12 2012-07-19 Unilever Plc Process for producing infusion packets
CN110450391A (en) * 2018-05-07 2019-11-15 嘉兴优逸客智能家居有限公司 The production method of integral type bag multiple layer combination body

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