Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1988-07-14
1990-01-09
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264129, 264134, 264146, 2642105, 2642358, 264285, 2642896, 2642902, 264346, 264DIG65, B29C 3510
Patent
active
048926892
ABSTRACT:
In a known process of making biaxially oriented polyethylene terephthalate photographic film, a certain amount of curl in the longitudinal direction can be imparted to the film by carrying out the longitudinal stretching step of that process while the film is asymmetrically heated across its thickness to a temperature gradient Delta T across the film of at least 10.degree. C. while the longitudinal stretching tension applied to the film is less than 10 N/sq.mm.
REFERENCES:
patent: 3873664 (1975-03-01), Curtis et al.
patent: 4093695 (1978-06-01), Heirbaut
patent: 4140740 (1979-02-01), De Smedt et al.
patent: 4141735 (1979-02-01), Schrader et al.
patent: 4293508 (1981-10-01), Heirbaut et al.
patent: 4617164 (1986-10-01), Kanesaki et al.
De Groot Luc M.
De Keyzer Jan K.
Van Cappellen Jan B.
Vancoppenolle Gery
Vandenbrande Daniel G.
AGFA-GEVAERT N.V.
Daniel William J.
Thurlow Jeffery
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