Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Reexamination Certificate
2007-01-09
2007-01-09
McDowell, Suzanne E. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
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.
Hatashi Katsunori
Miyata Takahiro
Sunamoto Tatsuya
Yoshikawa Tadao
Kuraray Co. Ltd.
McDowell Suzanne E.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
LandOfFree
Method for making inflation films does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for making inflation films, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for making inflation films will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3797194