Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1992-10-27
1996-07-30
Nakarani, D. S.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
4284744, 4284747, 4284749, 4284758, 4284761, 4284763, 4284769, 428910, B32B 702, B32B 2734
Patent
active
055410111
ABSTRACT:
An oriented splittable film which contains nylon and meta-xylene adipamide at a weight ratio of 40-85:15-60 and which was oriented with a magnification above 2.8 times in both directions of MD and TD. Examples of nylon include nylon 66, nylon 6-66 copolymer and so on. Under this manufacturing method for an oriented splittable film, when a raw film is heated in a biaxially orienting process, such as the tubular method, the heating temperature at the side part of the film, in the direction of film width, when folding the bubbles, is controlled along the circumference direction of the bubbles so that it is lower than the heating temperature of the part of the film which is used later as a product. The heat treatment process for these films includes a first heat treatment step implemented for films at temperatures between 120 degrees C. and 190 degrees C. based on the tubular method or tenter method and a second heat treatment step implemented for films at temperatures between 190 degrees C. and 220 degrees C. based on the tenter method.
REFERENCES:
patent: 4568580 (1986-02-01), Ghirardello et al.
Patent Abstracts of Japan JP-56 062 129 (Toyobo Co. Ltd.) May 27, 1991.
Patent Abstracts of Japan JP-2 302 467 (Teijin Ltd.) Dec. 14, 1990.
Database WPIL--Derwent Publications JP-4 115 926 (Sumitomo Bakelite Co.) Apr. 16, 1992.
Database WPIL--Derwent Publications JP-4 169 231 (Sumitomo Bakelite Co.) Jun. 17, 1992.
Hayashi Takeo
Iwamoto Takehiro
Takashige Masao
Utsuki Katsumi
Idemitsu Petrochemical Co. Ltd.
Nakarani D. S.
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