Oriented film easy to split and method of producing the same

Details Oriented film easy to split and method of producing the same Oriented film easy to split and method of producing the same

1996-03-15

1999-07-20

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264146, 2642095, 2642102, 2642105, 2642107, 2642358, 2642896, 2642902, 264342RE, 264346, 264567, B29C 5528, B29C 5308

Patent

active

059253053

ABSTRACT:
An oriented splittable film which contains nylon and meta-xylylene 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: 3678546 (1972-07-01), Matsugu et al.
patent: 3946089 (1976-03-01), Furukawa et al.
patent: 4978484 (1990-12-01), Takashige et al.
patent: 5094799 (1992-03-01), Takashige et al.
patent: 5158637 (1992-10-01), Takashige et al.

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