Method of manufacturing plastic bags in a continuous way

Details Method of manufacturing plastic bags in a continuous way Method of manufacturing plastic bags in a continuous way

1975-12-12

1977-06-21

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

93 35R, 156306, B32B 3126

Patent

active

040309568

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: 3388019 (1968-06-01), Thigpen
patent: 3499817 (1970-03-01), Havens et al.
patent: 3622421 (1971-11-01), Cook
patent: 3893884 (1975-07-01), Class

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