Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1976-09-20
1978-01-24
Dixon, Jr., William R.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
156290, 156581, 215 12R, 428 57, 428157, 428195, B32B 300, B65D 1116
Patent
active
040705137
ABSTRACT:
The disclosure relates to an improved seal bar used with a mandrel-turret machine for winding a sheet blank of heat shrinkable plastic in end overlapping relationship and sealing the overlapped ends by heat and pressure as a side seam of a sleeve. The seal bar includes plural rows of islands disposed along the heated nose surface through its length, the islands consisting of either raised portions or indented portions. The islands interrupt the heated sealing surface providing a series of hot and relatively colder spots. This prevents burning failures in the seam and permits a wider latitude of operating temperatures for the sealing mechanism.
There is also a new and novel seamed sleeve of heat shrinkable polymer of the foamed or foam/film type, the seam having corresponding islands appearing as outer surface variations along the seal-seam area corresponding with the placement of the islands on the seal bar nose surface used in making the seam.
REFERENCES:
patent: 3013930 (1961-12-01), Serbin
patent: 3017315 (1962-01-01), Doyle
patent: 3258385 (1966-06-01), Lake
patent: 3914152 (1975-10-01), Amberg et al.
Dixon Jr. William R.
Nelson John R.
Owens--Illinois, Inc.
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