Apparatus for applying transverse weld seams to superposed webs

Details Apparatus for applying transverse weld seams to superposed webs Apparatus for applying transverse weld seams to superposed webs

1979-03-02

1981-01-13

Drummond, Douglas J.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With cutting, punching, piercing, severing, or tearing

1565835, B32B 3100, B30B 504

Patent

active

042447720

ABSTRACT:
In the production of transverse weld seams at intervals along a web of travelling superposed plastics films, the problem of weaknesses caused by shrinkage of each seam as it cools is solved by forming a loop in the web adjacent the intended seam and slackly clamping the web on each side of the loop before the seam is applied and the web released again.

REFERENCES:
patent: 3622421 (1971-11-01), Cook
patent: 4115183 (1978-09-01), Achelpohl

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