现如今，济南注塑加工的技术已经相当成熟，从事济南塑料外壳加工的企业更是越来越多。但是，济南塑料外壳加工毕竟是一件相当复杂的事，其间还是会出现一些小问题的。下面我们便来简单介绍下济南注塑加工的外壳加工表面缩水的原因。Today, Ji'nan injection molding technology has been quite mature, engaged in the processing of plastic shell Tianjin enterprises are more and more. However, the Ji'nan plastic casing processing is a very complex thing, after all, there will be some small problems. Here we will briefly introduce the Ji'nan injection molding processing shell surface shrinkage causes.

济南注塑加工表面缩水是在塑料外壳的表面发生凹坑状，一般出现在体积收缩量较大的肉厚部位。塑料外壳在冷却的过程中，发生体积收缩，由此发生向中心部收缩的拉拽力。Ji'nan injection molding is shrinking surface concave on the surface of the plastic shell, generally appear in the flesh part of large volume shrinkage. During the cooling process, the plastic shell has a volume contraction, and thus the pulling force which is contracted to the center part is generated.

此时受到表面冷料层的刚性和树脂收缩力之间平衡性的影响，冷料层较弱时，向塑料外壳中心部发生拉拽力，出现在产品表面上表现为凹陷状。冷料层较强时，塑料外壳的中心部位会产生真空气泡。At the same time, the effect of the balance between the rigidity of the surface cold material layer and the shrinkage force of the resin is affected, and the pulling force of the central part of the plastic shell is weak when the cold material layer is weak. When the cold material layer is strong, the central part of the plastic shell will produce vacuum bubbles.

济南注塑加工厂家认为，在肉厚较厚区域，冷料表层的刚性和树脂收缩力的平衡性与塑料外壳表面的冷却速度息息相关，冷却速度较快时形成真空气泡。相反，较慢时形成缩水。另外，冷却速度变慢，体积收缩差会变小，缩水状况也会变小。Ji'nan plastic processing factory, in the thick thick area, the cooling speed and the surface of the plastic shell of the surface of the rigid and cold material balance resin shrinkage force is closely related to the cooling rate of vacuum bubble formation. On the contrary, the slow formation of shrinkage. In addition, the cooling rate is slow, the volume contraction difference will become smaller, shrink situation will become smaller.