GB774417A - Improved machine for bending or folding sheets of plastic material - Google Patents

Improved machine for bending or folding sheets of plastic material

Info

Publication number
GB774417A
GB774417A GB2669854A GB2669854A GB774417A GB 774417 A GB774417 A GB 774417A GB 2669854 A GB2669854 A GB 2669854A GB 2669854 A GB2669854 A GB 2669854A GB 774417 A GB774417 A GB 774417A
Authority
GB
United Kingdom
Prior art keywords
sheet
platen
bending
zones
heated
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
GB2669854A
Inventor
Thomas Frederick Rawls
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.)
MILFORD ASTOR Ltd
Original Assignee
MILFORD ASTOR 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 MILFORD ASTOR Ltd filed Critical MILFORD ASTOR Ltd
Priority to GB2669854A priority Critical patent/GB774417A/en
Publication of GB774417A publication Critical patent/GB774417A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02Bending or folding
    • B29C53/04Bending or folding of plates or sheets

Abstract

Thermoplastic sheet material is bent or folded by applying heat to narrow strip-like zones and then bending or folding the sheet along the zones so rendered pliable before there is any substantial transfer of heat to adjacent zones. A press may be used, of the kind intended for printing markings on cloth, in which a lower platen moves upwards against a fixed upper platen. The sheet is placed on the lower platen which is fed forward into position beneath the upper platen, to which a hot bar is attached. The lower platen is then raised to press the sheet against the hot bar, where it is held long enough to soften the strip of material in contact with it sufficiently for bending, without the adjacent parts of the sheet being appreciably heated. The sheet is removed and bent manually along the heated zone. By the use of more than one heated bar the strip-like zones may be heated simultaneously, for which purpose a metal plate with areas in relief may be used. The bars may be clamped to the upper platen or attached thereto by being magnetized, or by adhesive. Templates may be used to position the sheet on the lower platen and ensure that it is bent in the correct places. The sheet may have printed matter added between the bending operations. Specification 653,665 [Group XVI] is referred to.
GB2669854A 1954-09-15 1954-09-15 Improved machine for bending or folding sheets of plastic material Expired GB774417A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2669854A GB774417A (en) 1954-09-15 1954-09-15 Improved machine for bending or folding sheets of plastic material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2669854A GB774417A (en) 1954-09-15 1954-09-15 Improved machine for bending or folding sheets of plastic material

Publications (1)

Publication Number Publication Date
GB774417A true GB774417A (en) 1957-05-08

Family

ID=10247803

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2669854A Expired GB774417A (en) 1954-09-15 1954-09-15 Improved machine for bending or folding sheets of plastic material

Country Status (1)

Country Link
GB (1) GB774417A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072070A (en) * 1989-12-01 1991-12-10 Peter J. Balsells Device for sealing electromagnetic waves

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072070A (en) * 1989-12-01 1991-12-10 Peter J. Balsells Device for sealing electromagnetic waves

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