GB991830A - Improvements in or relating to the vacuum-forming and pressure-forming of thermoplastic films - Google Patents

Improvements in or relating to the vacuum-forming and pressure-forming of thermoplastic films

Info

Publication number
GB991830A
GB991830A GB2014163A GB2014163A GB991830A GB 991830 A GB991830 A GB 991830A GB 2014163 A GB2014163 A GB 2014163A GB 2014163 A GB2014163 A GB 2014163A GB 991830 A GB991830 A GB 991830A
Authority
GB
United Kingdom
Prior art keywords
sheet
heater
forming
mould
vacuum
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
GB2014163A
Inventor
Sidney Walter Fagence
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.)
ML Shelley and Partners Ltd
Original Assignee
ML Shelley and Partners Ltd
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 ML Shelley and Partners Ltd filed Critical ML Shelley and Partners Ltd
Priority to GB2014163A priority Critical patent/GB991830A/en
Publication of GB991830A publication Critical patent/GB991830A/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
    • B29C51/04—Combined thermoforming and prestretching, e.g. biaxial stretching
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure
    • 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
    • B29C51/10—Forming by pressure difference, e.g. vacuum

Landscapes

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

Abstract

991,830. Forming thermoplastic sheet material. M. L. SHELLEY & PARTNERS Ltd. April 22, 1964 [May 21, 1963; Feb. 7, 1964], Nos. 20141/63 and 5231/64. Heading B5A. In a pressure or vacuum forming process a heated thermoplastic sheet or film is first preformed in a female mould, by forcing the sheet partially thereinto, and then finally formed by differential fluid pressure, the heating being continued during both the preforming and forming steps. In the embodiment shown in Fig. 2, a sheet or film is clamped around a multi-cavity female vacuum mould 2, heated by heater 5, and partially forced into the mould cavities 3 by superatmospheric air issuing through channels 10 in the heater. The sheet is then fully formed by applying suction to the mould, the heater switched off and the formed sheet removed when cool. In an alternative embodiment, shown in Fig. 5, the sheet 12 is preformed by means of " assist plugs " fixed to the heater 20, the subsequent final forming step being as described above. In a further embodiment (Fig. 8, not shown) the assist plugs are slidable through the heater. In another embodiment (Fig. 9, not shown) the " assist plugs " are located to one side of the forming apparatus and are reciprocable to a position below the heater and above the sheet. In the embodiment shown in Fig. 7 the sheet is clamped above a male vacuum mould 22 and preformed into the interstices 24 by assist plugs 26 mounted on heater 25. In all embodiments the final forming may be done by pressure moulding instead of vacuum moulding.
GB2014163A 1963-05-21 1963-05-21 Improvements in or relating to the vacuum-forming and pressure-forming of thermoplastic films Expired GB991830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2014163A GB991830A (en) 1963-05-21 1963-05-21 Improvements in or relating to the vacuum-forming and pressure-forming of thermoplastic films

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2014163A GB991830A (en) 1963-05-21 1963-05-21 Improvements in or relating to the vacuum-forming and pressure-forming of thermoplastic films

Publications (1)

Publication Number Publication Date
GB991830A true GB991830A (en) 1965-05-12

Family

ID=10141056

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2014163A Expired GB991830A (en) 1963-05-21 1963-05-21 Improvements in or relating to the vacuum-forming and pressure-forming of thermoplastic films

Country Status (1)

Country Link
GB (1) GB991830A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5472660A (en) * 1989-03-08 1995-12-05 Fortex, Inc. Method for the manufacture of shaped products of biaxially oriented polymeric material
US5683648A (en) * 1992-03-25 1997-11-04 Design Technology, Inc. Thermoforming and heat shrinking for forming containers
US6093364A (en) * 1989-03-08 2000-07-25 Fortex, Inc. Method for producing a biaxially oriented open-ended container

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5472660A (en) * 1989-03-08 1995-12-05 Fortex, Inc. Method for the manufacture of shaped products of biaxially oriented polymeric material
US6093364A (en) * 1989-03-08 2000-07-25 Fortex, Inc. Method for producing a biaxially oriented open-ended container
US6555047B1 (en) 1989-03-08 2003-04-29 Fortex, Inc. Method for producing a biaxially oriented open ended container
US5683648A (en) * 1992-03-25 1997-11-04 Design Technology, Inc. Thermoforming and heat shrinking for forming containers

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