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    • 3. 发明授权
    • Method of press-molding thermoplastic resin
    • 压塑热塑性树脂的方法
    • US6001287A
    • 1999-12-14
    • US97595
    • 1998-06-16
    • Masahito MatsumotoMasaaki TsutsubuchiTakeo KitayamaYukito NakamuraYoshiaki Togawa
    • Masahito MatsumotoMasaaki TsutsubuchiTakeo KitayamaYukito NakamuraYoshiaki Togawa
    • B29C43/58B29C45/56
    • B29C43/58
    • A thermoplastic resin is molded by a press-molding method wherein a thermoplastic resin in a molten state is compressed to flow between a pair of female and male molds so as to be formed into a predetermined shape. A compression rate of the mold is controlled so that the following expression (1) is satisfied:0.5.ltoreq.B/A.ltoreq.2 (1)wherein A (mm/s.sup.2) is an acceleration which is realized at a time when the compression rate is 75% of a maximum rate in a compression-acceleration region, which region is defined as a period of time from a moment when the compression of the molten thermoplastic resin is started to a moment when the compression rate reaches the maximum rate; and B (mm/s.sup.2) is a deceleration which is realized at a time when the compression rate is 75% of the maximum rate in a compression-deceleration region, which region is defined as a period of time from a moment when the compression rate reaches the maximum rate to a moment when the closing of the molds is complete. By this method, a molded article having excellent surface appearance free from unevenness of gloss and surface irregularity can be obtained.
    • 热塑性树脂通过压制成型法成型,其中熔融状态的热塑性树脂被压缩以在一对阴模和阳模之间流动,从而形成预定的形状。 控制模具的压缩率,使得满足以下表达式(1):其中A(mm / s2)是在时间上实现的加速度, 压缩率是压缩加速区域的最大速率的75%,该区域被定义为从熔融热塑性树脂的压缩开始到压缩率达到最大速度的时刻的时间段 ; B(mm / s2)是在压缩率为压缩 - 减速区域的最大速率的75%时实现的减速度,该区域被定义为从压缩比 当模具的关闭完成时达到最大速率。 通过该方法,可以获得具有优异的表面外观的光泽不均匀性和表面不均匀性的成型体。
    • 6. 发明授权
    • Method of press-molding thermoplastic resins
    • 压塑热塑性树脂的方法
    • US5795510A
    • 1998-08-18
    • US728315
    • 1996-10-09
    • Masahito MatsumotoMasaaki TsutsubuchiTakeo KitayamaYukito NakamuraYoshiaki Togawa
    • Masahito MatsumotoMasaaki TsutsubuchiTakeo KitayamaYukito NakamuraYoshiaki Togawa
    • B29C43/36B29C43/58B29C45/56
    • B29C43/58B29C2043/5833B29K2101/12
    • A thermoplastic resin is molded by a press-molding method wherein a thermoplastic resin in a molten state is compressed to flow between a pair of female and male molds so as to be formed into a predetermined shape. A compression rate of the mold is controlled so that the following expression (1) is satisfied: 0.5.ltorsim.B/A.ltorsim.2 (1) wherein A (mm/s.sup.2) is an acceleration which is realized at a time when the compression rate is 75% of a maximum rate in a compression-acceleration region, which region is defined as a period of time from a moment when the compression of the molten thermoplastic resin is started to a moment when the compression rate reaches the maximum rate; and B (mm/s.sup.2) is a deceleration which is realized at a time when the compression rate is 75% of the maximum rate in a compression-deceleration region, which region is defined as a period of time from a moment when the compression rate reaches the maximum rate to a moment when the closing of the molds is complete. By this method, a molded article having excellent surface appearance free from unevenness of gloss and surface irregularity can be obtained.
    • 热塑性树脂通过压制成型法成型,其中熔融状态的热塑性树脂被压缩以在一对阴模和阳模之间流动,从而形成预定的形状。 控制模具的压缩率,使得满足以下表达式(1):0.5无关B / A大致2(1)其中A(mm / s2)是在压缩率为 压缩加速区域的最大速率的75%,该区域被定义为从熔融热塑性树脂的压缩开始到压缩率达到最大速率的时刻的时间段; B(mm / s2)是在压缩率为压缩 - 减速区域的最大速率的75%时实现的减速度,该区域被定义为从压缩比 当模具的关闭完成时达到最大速率。 通过该方法,可以获得具有优异的表面外观的光泽不均匀性和表面不均匀性的成型体。