一、模具方面 One, mould aspect （1）浇口太小，应考虑调整浇口尺寸或增设辅助浇口。 (1) the gate is too small, and you should consider adjusting the size of the gate or adding a secondary gate. （2）分流道太小或配置不当，应尽量安排得平衡合理或增加分流道尺寸。 (2) if the channel is too small or improperly configured, it should be arranged to balance reasonable or increase the size of the shunt channel. （3）模具结构不良造成注塑周期反常。 (3) the mould structure is bad and the injection cycle is abnormal. 二、设备方面 equipment （1）机筒内有死角或障碍物，容易促进熔料降解。 (1) there is a dead Angle or obstruction in the cylinder, which facilitates the degradation of the melting material. （2）机器塑化容量太小，塑料在机筒内塑化不充分，机器塑化容量太大，塑料在机筒内受热和受剪切作用的时间过长，塑料容易老化，使制品变脆。 (2) the plasticizing capacity of the machine is too small, plastic plasticizing inadequate within the barrel, plasticizing capacity of the machine is too large, the plastic is heated and the shearing action in the barrel time is too long, plastic easy to aging, make the products become fragile. （3）顶出装置倾斜或不平衡，顶干截面积小或分布不当。 (3) the top of the device is tilted or unbalanced, with a small or poorly distributed roof. 三、原料方面 Third, raw materials （1）塑料周转箱原料混有其它杂质或掺杂了不适当的或过量的溶剂或其它添加剂时。 (1) when the materials of the plastic circulating box are mixed with other impurities or adulterated with inappropriate or excess solvents or other additives. （2）塑料再生次数太多或再生料含量太高，或在机筒内加热时间太长，都会促使制件脆裂。 (2) the amount of plastic regenerated is too high or too high, or too long in the tube to make the product brittle. （3）塑料本身质量不佳，例如分子量分布大，含有刚性分子链等不均匀结构的成分占有量过大，或受其它塑料掺杂污染、不良添加剂污染、灰尘杂质污染等也是造成发脆的原因。 (3) the quality of the plastic itself, such as molecular weight distribution, contains the uneven structure such as molecular chain rigidity is too large in the number of components, or other plastic pollution, dust, impurity doping pollution, bad additive pollution is the cause of brittle.