Title:
【発明の名称】圧延熱処理フィルムまたはシートの製造方法
Document Type and Number:
Japanese Patent JP2606894
Kind Code:
B2
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 through between 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 temperture which is higher than the rolling temperature but lower than the melting point of the resin material, the aforesaid process comprising that the heat treatment is carried out for a time (t: seconds) satisfying the formula wherein d is a thickness (mm) of the rolled films or sheets, r is a thickness reduction rate of the rolled films or sheets, Tr is the rolling temperature ( DEG C),Ta is the heat treatment temperature ( DEG C), and Tm is the melting point ( DEG C) of the crystalline resin.
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Inventors:
Hiroshi Takasu
Arase Susumu
Junichiro Yokota
Kazuro Nakayama
Arase Susumu
Junichiro Yokota
Kazuro Nakayama
Application Number:
JP20374788A
Publication Date:
May 07, 1997
Filing Date:
August 18, 1988
Export Citation:
Assignee:
Chisso Co., Ltd.
Director of Industrial Technology
Director of Industrial Technology
International Classes:
B29C55/18; B29C71/02; B29K23/00; B29L7/00; (IPC1-7): B29C55/18; B29C71/02
Domestic Patent References:
| JP5682235A | ||||
| JP58199114A | ||||
| JP6093625A |
Attorney, Agent or Firm:
Hiromitsu Fujimoto (2 outside)