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    • 3. 发明授权
    • Process for molding plastic lenses
    • 塑料镜片成型工艺
    • US5415817A
    • 1995-05-16
    • US141136
    • 1993-10-22
    • Po-Ling ShiaoChien-Tsung WuChi-Shen TuanTzong-Ming Yeh
    • Po-Ling ShiaoChien-Tsung WuChi-Shen TuanTzong-Ming Yeh
    • B29C45/26B29C45/56B29D11/00
    • B29D11/00413B29C45/2669B29C45/561B29C2045/5615B29C2045/565B29L2011/0016Y10S425/808
    • An improved injection/compression molding process for the manufacturing of high quality concave optical lenses of thin thickness. A thermoplastic material is injected into a mold cavity of an injection/compression molding machine, the mold cavity is designed to have adjustable thickness and is initially set at a thickness greater than the lens to be produced. After the amount of the plastic injected fills the enlarged cavity, the thickness of the cavity is gradually reduced by exerting a compressional force on the thermoplastic material inside the mold cavity. During the compression stage, the injection continues and the excess thermoplastic material is squeezed into an overflow pocket inside the injection/compression mold. The injection apparatus can be switched into a pressure holding mode during and after the compression stage to prevent any backflow and post-injection shrinkage. The process disclosed in the present invention offers many significant advantages over prior art processes, including avoidance of the commonly encountered weld line and birefrigence problem, substantially improved quality control, elimination of external heating or cooling needs, increased production rate, and reduced production cost.
    • 改进的注射/压缩成型工艺,用于制造厚度较薄的高品质凹型光学透镜。 将热塑性材料注射到注射/压缩成型机的模腔中,模腔被设计成具有可调节的厚度,并且最初设定为比要生产的镜片更大的厚度。 在注入的塑料的量填充了扩大的空腔之后,通过对模具腔内的热塑性材料施加压缩力来逐渐减小空腔的厚度。 在压缩阶段期间,喷射继续,并且多余的热塑性材料被挤压入注射/压缩模具内的溢流口袋中。 注射装置可以在压缩阶段期间和之后切换到压力保持模式,以防止任何回流和后注射收缩。 本发明公开的方法与现有技术方法相比具有许多显着的优点,包括避免通常遇到的焊接线和双束问题,显着改进质量控制,消除外部加热或冷却需求,提高生产率和降低生产成本。