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    • 6. 发明专利
    • DE68921030T2
    • 1995-07-20
    • DE68921030
    • 1989-08-17
    • CHISSO CORPAGENCY IND SCIENCE TECHN
    • TAKASU HIROSHIARASE SUSUMUYOKOTA JUNICHIRONAKAYAMA KAZUO
    • B29C55/18B29C71/02B29K23/00B29L7/00
    • 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.
    • 7. 发明专利
    • DE68921030D1
    • 1995-03-23
    • DE68921030
    • 1989-08-17
    • CHISSO CORPAGENCY IND SCIENCE TECHN
    • TAKASU HIROSHIARASE SUSUMUYOKOTA JUNICHIRONAKAYAMA KAZUO
    • B29C55/18B29C71/02B29K23/00B29L7/00
    • 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.