Production of stretch plastic film

Details Production of stretch plastic film Production of stretch plastic film

B - Operations, Transporting

29

C

B29C 47/20 (2006.01) B29C 47/00 (2006.01) B29C 47/78 (2006.01) B29C 47/88 (2006.01) B29C 55/02 (2006.01) B29C 55/28 (2006.01) B29C 65/02 (2006.01)

Patent

CA 2324042

A method of producing stretch plastic film includes extruding suitable plastic material from an annular die as a tubular film, and forming the extruded film into a bubble with air entrapped therein by simultaneously collapsing and bonding the tubular film bubble at a predetermined distance from the annular die. The temperature of the tubular film when collapsed is sufficiently high to cause opposite sides of the collapsed film to become bonded together and form a single layer stretch plastic film, which may be subsequently stretched to reduce its thickness.

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