Method for making inflation films

Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length

Reexamination Certificate

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C264S573000

Reexamination Certificate

active

10650847

ABSTRACT:
An inflation film is formed by extruding a raw resin in a molten state through a circular die to form a tubular film, expanding the tubular film by the pressure of a gaseous medium introduced into an inner space of the tubular film, while the tubular film is being cooled to be solidified by blowing a cooling gas to the outer surface of the tubular film, and drawing the film while being progressively flattened by guide members. During the manufacture, the temperature Tf (° C.) of the solidified tubular film at the time it contacts the guide member for the first time is so adjusted as not to be higher than Tr (5) [° C.]; wherein Tr (5) represents the temperature at which the thermal deformation ratio of the solidified tubular film becomes 5% when it is measured, being loaded with a stress of a value equal to the frictional force received from the guide members under the conditions of manufacture of the film.

REFERENCES:
patent: 4330501 (1982-05-01), Jones et al.
patent: 5468444 (1995-11-01), Yazaki et al.
patent: 5525277 (1996-06-01), Joseph
patent: 9-109274 (1997-04-01), None
patent: 10-29243 (1998-02-01), None
patent: 2001-239583 (2001-09-01), None
U.S. Appl. No. 10/843,308, filed May 12, 2004, Yoshikawa, et al.
U.S. Appl. No. 10/650,847, filed Aug. 29, 2003, Miyata, et al.

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