Heat sealing platen

Details Heat sealing platen Heat sealing platen

1978-06-21

1980-08-05

Wityshyn, Michael G.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With stretching or tensioning means

53557, 53281, 53341, 53357, 156581, 1565834, B30B 1502, B30B 1534

Patent

active

042160502

ABSTRACT:
A platen including an annular surface adapted to heat seal a piece of film to the lip of a cup, and a central projection which is hotter than the annular surface to cause greater shrinkage in a central portion than in the surrounding portion of the sealed piece of film. This shrinkage of the central portion and the resultant gathering of the surrounding portion results in a planar central portion of the sealed film with radially projecting ridges and grooves around its periphery. The ridges and grooves draw visual attention to the central portion and features, such as perforations for a straw-hole, located therein.

REFERENCES:
patent: 2588604 (1952-03-01), Archer
patent: 3414181 (1968-12-01), Sloan
patent: 3792181 (1974-02-01), Mahaffy et al.
patent: 4092817 (1978-06-01), Rist
patent: 4143587 (1979-03-01), Fujii

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