Process for controlling the curl of photographic film

Details Process for controlling the curl of photographic film Process for controlling the curl of photographic film

1989-06-29

1991-02-19

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264134, 264146, 264160, 264171, 2642105, 2642107, 26421118, 2642112, 2642358, 264237, 2642396, 264342RE, B29C 3510, B29C 5512, B29C 7102

Patent

active

049942140

ABSTRACT:
A process of making biaxially oriented polyethylene terephthalate photographic film having a controlled amount of curl in the longitudinal direction, wherein the file is subjected to longitudinal stretching while being asymmetrically heated across its thickness, then wound into a stock roll, and the stock roll thus obtained is heat-tempered. The stock roll after heat-tempering may be longitudinally slit, cut and rewound into smaller rolls in a winding direction opposite to the direction of the longitudinal curl induced in the film during the longitudinal asymmetrical heat-stretching.

REFERENCES:
patent: 3426115 (1969-02-01), Taber
patent: 3873664 (1975-03-01), Curtis et al.
patent: 4093695 (1978-06-01), Heirbaut
patent: 4140740 (1979-02-01), DeSmedt et al.
patent: 4141735 (1979-02-01), Schrader et al.
patent: 4293508 (1981-10-01), Heirbaut et al.
patent: 4892689 (1990-01-01), Van Cappellen et al.

Affiliated with

Also associated with

Rating

Process for controlling the curl of photographic film does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for controlling the curl of photographic film, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for controlling the curl of photographic film will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1141900