Plastic and nonmetallic article shaping or treating: processes – Disparate treatment of article subsequent to working,... – Effecting temperature change
Patent
1989-08-17
1991-12-03
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Disparate treatment of article subsequent to working,...
Effecting temperature change
2642102, 264280, 425363, B29C 7102
Patent
active
050698559
ABSTRACT:
The present invention provides a process for preparing rolled heat-treated films or sheets of a crystalline thermoplastic resin in which heat shrinkage is notably improved, formability is excellent and tensile strength in a transverse direction is increased. The process of the present invention comprises the steps of rolling a crystalline thermoplastic resin material between at least one pair of rolls at a temperature which is lower than the melting point of the resin material but higher than room temperature, and then successively subjecting the resin material to a heat treatment at a temperature which is higher than the rolling temperature but lower than the melting point of the resin material. The heat treatment is carried out for a time (t: seconds) satisfying the formula ##EQU1## wherein d is the thickness (mm) of the rolled films or sheets, r is the thickness reduction rate of the rolled films or sheets, Tr is the rolling temperature (.degree.C.), Ta is the heat treatment temperature (.degree.C.), and Tm is the melting point (.degree.C.) of the crystalline resin.
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Arase Susumu
Nakayama Kazuo
Takasu Hiroshi
Yokota Junichiro
Agency of Industrial Science and Technology
Chisso Corporation
Thurlow Jeffery
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