Apparatus for making envelopes from a continuous film sheet

Details Apparatus for making envelopes from a continuous film sheet Apparatus for making envelopes from a continuous film sheet

1982-03-03

1985-03-19

Coan, James F.

Manufacturing container or tube from paper; or other manufacturi

Container making

Pliable container

493248, 493369, B31B 126, B65H 3510

Patent

active

045056994

ABSTRACT:
A continuous film sheet having a width in a horizontal direction is unwound from a film roll with its axis being substantially horizontally kept. The direction of extension of the film sheet is changed so as to have its width in a vertical direction before the film sheet is slit along its center line into two continuous strips. The two continuous strips are superposed on each other and heat-sealed in lengthwise and transverse directions to form a plurality of rectangular sections defined by heat-sealed sides. The heat-sealed sheet is then slit and cut into separated envelopes having their respective three heat-sealed edges.

REFERENCES:
patent: 2435560 (1948-02-01), Richens
patent: 2444685 (1948-07-01), Waters
patent: 2873566 (1959-02-01), Sylvester et al.
patent: 3433136 (1969-03-01), Hartbauer et al.
patent: 3512457 (1970-05-01), Watanabe
patent: 4055109 (1977-10-01), Kan

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