Apparatus and method for forming apertures in film materials

Details Apparatus and method for forming apertures in film materials Apparatus and method for forming apertures in film materials

1984-06-13

1985-12-17

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264154, 425290, 4253021, B29D 904

Patent

active

045591997

ABSTRACT:
A continuous tubular film passes through two opposed vacuum plates. One of the vacuum plates has a heated die formed therein. The film is pillowed and a portion contacts the die. A section is cut from the film and removed and, subsequently, the pillowed film is deflated. These steps are repeated in timed sequence. The apparatus and process allows the forming of apertures or sections in one side of a tubular film alone.

REFERENCES:
patent: 3771938 (1973-11-01), Pinto et al.
patent: 4184831 (1980-01-01), Hegler et al.

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