Apparatus for manufacturing plastic bags in a continuous way

Details Apparatus for manufacturing plastic bags in a continuous way Apparatus for manufacturing plastic bags in a continuous way

1977-03-11

1978-05-16

Drummond, Douglas J.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With work cooling means

156499, 156555, B32B 3100, B31F 500

Patent

active

040897290

ABSTRACT:
Plastic bags are obtained from a tubular foil of thermoplastics by means of heatsealing. The heatsealing member acts upon a lower wall of the flattened non-tensioned tubular foil, and without a counter pressure to the upper wall of the foil. The entire thickness of the lower wall is plasticized but only a portion of the thickness of the upper wall is plasticized. The assembly of heated lower wall and partly heated upper wall facing each other is passed through two pressure rolls, the roller surface contacting the surface which has not been in contact with the heat sealing member consisting of metal is cooled.

REFERENCES:
patent: 2952299 (1960-09-01), Finke
patent: 2971874 (1961-02-01), Canno
patent: 2975824 (1961-03-01), Schenkengel
patent: 3153607 (1964-10-01), Ambler
patent: 3388019 (1968-06-01), Thigpen
patent: 3499817 (1970-03-01), Hauens et al.
patent: 3622421 (1971-11-01), Cook
patent: 3708377 (1973-01-01), Finke et al.
patent: 3893884 (1975-07-01), Class

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