Envelopes – wrappers – and paperboard boxes – Envelope – Blanks
Patent
1981-06-29
1982-11-02
Price, William
Envelopes, wrappers, and paperboard boxes
Envelope
Blanks
229 43, 229DIG12, 220 902, 220359, B65D 4302
Patent
active
043569552
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: 3402874 (1968-09-01), Sternau
patent: 3501896 (1970-03-01), Von Stoeser et al.
patent: 4092817 (1978-06-01), Rist
Alexander Cruzan
Elkins Gary E.
Huebsch William L.
Minnesota Mining and Manufacturing Company
Price William
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