GB988975A - Improvements in or relating to the shaping of thermoplastic organic polymeric sheet - Google Patents

Improvements in or relating to the shaping of thermoplastic organic polymeric sheet

Info

Publication number
GB988975A
GB988975A GB2458263A GB2458263A GB988975A GB 988975 A GB988975 A GB 988975A GB 2458263 A GB2458263 A GB 2458263A GB 2458263 A GB2458263 A GB 2458263A GB 988975 A GB988975 A GB 988975A
Authority
GB
United Kingdom
Prior art keywords
mould
sheet
carries
base
blow
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
GB2458263A
Inventor
George Edward Pentney
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries 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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB2458263A priority Critical patent/GB988975A/en
Priority to NL6403601A priority patent/NL6403601A/xx
Priority to FR979001A priority patent/FR1399894A/en
Publication of GB988975A publication Critical patent/GB988975A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • 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
    • B29C51/30—Moulds
    • B29C51/34—Moulds for undercut articles

Landscapes

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

Abstract

988,975. Moulding hollow articles. IMPERIAL CHEMICAL INDUSTRIES Ltd. March 25, 1964 [June 20, 1963], No. 24582/63. Heading B5A. In a blow moulding process, in which part of the mould cavity wall is formed by at least two intersecting planes, the sheet material is urged towards said part of the mould by a plunger which contacts only the small area of the sheet which will be formed by said mould part. In this way undue thinning of the sheet in this region is avoided. In the embodiment shown in the Figures, a cover, for use with a light fitting, having a re-entrant portion (see Fig. 4, not shown) is formed by clamping a heat softened sheet of thermoplastic material 15 against a base 5 by a female mould, comprising a box-like member 1 clamped by clips 4 to a two-piece base frame 2, and blowing the sheet into the mould. The base 5 carries four piston and cylinder mechanisms 7, each of which carries a wedge 9 of e.g. rubber, the wedges being biased to a retracted position by e.g. springs 13. In operation, air is introduced at a relatively low pressure through aperture 6 to blow the sheet partly into the mould, the pistons 7 then being actuated to push the appropriate portions of the sheet material into the corners of the mould. Increased air pressure is then applied to the sheet to completely shape it against the mould wall, the mould being disassembled and then withdrawn and the formed article removed when the sheet has sufficiently cooled.
GB2458263A 1963-06-20 1963-06-20 Improvements in or relating to the shaping of thermoplastic organic polymeric sheet Expired GB988975A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2458263A GB988975A (en) 1963-06-20 1963-06-20 Improvements in or relating to the shaping of thermoplastic organic polymeric sheet
NL6403601A NL6403601A (en) 1963-06-20 1964-04-03
FR979001A FR1399894A (en) 1963-06-20 1964-06-19 A method of producing a metal surface having a design

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2458263A GB988975A (en) 1963-06-20 1963-06-20 Improvements in or relating to the shaping of thermoplastic organic polymeric sheet

Publications (1)

Publication Number Publication Date
GB988975A true GB988975A (en) 1965-04-14

Family

ID=10213930

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2458263A Expired GB988975A (en) 1963-06-20 1963-06-20 Improvements in or relating to the shaping of thermoplastic organic polymeric sheet

Country Status (2)

Country Link
GB (1) GB988975A (en)
NL (1) NL6403601A (en)

Also Published As

Publication number Publication date
NL6403601A (en) 1964-05-25

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