Apparatus for making bottom seal thermoplastic bags

Details Apparatus for making bottom seal thermoplastic bags Apparatus for making bottom seal thermoplastic bags

1973-07-25

1978-08-08

Drummond, Douglas J.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With cutting, punching, piercing, severing, or tearing

156583, B32B 3100, B30B 1534

Patent

active

041054890

ABSTRACT:
According to the present disclosure, tubular thermoplastic material is intermittently fed between opposed transversely extending seal bars operating in timed relation with the intermittent feeding of the web to sequentially perform cutting and sealing of the web during its period of repose. To insure a clean straight transverse cut, which occurs momentarily before transverse sealing, the web is held under tension between longitudinally spaced draw and feed rolls. Immediately after the web is transversely severed, the seal bars are brought into pressure engagement transversely sealing the web along a margin which will define the bottom of the bag. Before the web is fed an additional increment, it is momentarily fed rearwardly to avoid the possibility of adherence to the seal bars.

REFERENCES:
patent: 2882956 (1956-04-01), Weist
patent: 2947345 (1960-08-01), Schjedahl
patent: 3043729 (1962-07-01), Seiden
patent: 3060075 (1962-10-01), Kincaid
patent: 3162564 (1964-12-01), Buchner
patent: 3483061 (1969-12-01), Takahshi et al.

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