In order to produce the high quality optical aspheric lens, the shrinkage of lens should be strictly controlled during the injection process. Serials of experiments are done to find the factors that affect the lens shrinkage during the injection molding process. The study is focused on the effect of gate size, packing time and pressure on the shrinkage. The gate size decides the effective packing time. Only when the effective packing time is enough, the shrinkage size will be decreased along with the packing pressure increased. However the packing time is determined by the gate size. But big gate size is not easily to be cut and the cutting difficulty will cause the part quality problems. The experiments show that packing pressure not only determines the part shrinkage size and also affects the part shrinkage uniformity. When the packing pressure is more than a critical one, the effect of packing pressure on the shrinkage size becomes smaller. And the shrinkage uniformity is guaranteed.

中文翻译：

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填充参数和浇口尺寸对非球面镜片零件收缩的影响

为了生产高质量的光学非球面镜片，在注射过程中应严格控制镜片的收缩率。进行了一系列实验，以发现影响注塑成型过程中镜片收缩的因素。该研究集中在浇口尺寸，填充时间和压力对收缩率的影响上。门的大小决定了有效的包装时间。仅当有效包装时间足够时，收缩尺寸才会随着包装压力的增加而减小。但是，包装时间由浇口尺寸决定。但是大的浇口尺寸不容易切割，切割困难将导致零件质量问题。实验表明，填充压力不仅决定零件的收缩尺寸，而且影响零件的收缩均匀性。当填料压力大于临界压力时，填料压力对收缩尺寸的影响变小。并且保证了收缩均匀性。