Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Bending or twisting of work
Patent
1988-06-14
1989-06-13
Dawson, Robert A.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Bending or twisting of work
156227, 156479, 425398, 425403, 493167, B29C 5304
Patent
active
048391263
ABSTRACT:
A method and apparatus for simultaneously folding the edges of a sheet of material, particularly the rigid plastic sheets of material having concave sections therein which are used as covers in "blister" packages. It utilizes a die having walls on the sides and a shelf inside the walls, a compressible layer which rests on top of the shelf over which the sheet of material is placed, and a heating plate which presses down on the sheet of material causing the edges of the sheet to become pliable and to bend upward against the walls of the die, and then folding the upright edges over a plate.
REFERENCES:
patent: 1326826 (1919-12-01), Anthony
patent: 1365648 (1921-01-01), Anthony
patent: 1811871 (1931-06-01), Anthony
patent: 2487494 (1949-11-01), Taber
patent: 2620854 (1952-12-01), Wetherell
patent: 2740458 (1956-04-01), Wold
patent: 2756805 (1956-07-01), Silverman
patent: 2808099 (1957-10-01), Silverman
patent: 3089536 (1963-05-01), Bolles
patent: 3147172 (1964-09-01), Wesa
patent: 3580770 (1971-05-01), Dyal
patent: 3753831 (1973-08-01), Copithorne
patent: 3978191 (1976-08-01), Allen et al.
patent: 4019944 (1977-04-01), Tomita
patent: 4239572 (1980-12-01), Tomita
patent: 4347091 (1982-08-01), Hauck et al.
patent: 4443398 (1984-04-01), Martinelli et al.
patent: 4601689 (1986-07-01), Finkle et al.
Bamber Jeffrey V.
Dawson Robert A.
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