1 模具方面 1 mould aspect 1）浇口太小，应考虑调整浇口尺寸或增设辅助浇口。 1) if the gate is too small, you should consider adjusting the gate size or adding auxiliary 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 diversion channel is too small or improperly configured, it should be arranged in a reasonable and reasonable way to increase the size of the shunt. 3）模具结构不良造成注塑周期反常。塑料增韧剂 3) abnormal mold structure caused the abnormal cycle of injection molding. Plastic toughening agent 2 设备方面 2. 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 obstacle 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 machine plasticizing capacity is too small, plastic in the machine tube is plasticized inadequate; The machine is too plastic, the plastic can be heated and cut in the cylinder for too long, the plastic can age easily and make the products brittle. 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 inclined or unbalanced, with a small area or improper distribution. 3 原料方面 3 raw materials 1）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 raw material is mixed with other impurities or adulterated with improper or excessive solvents or other additives. 2）有些塑料如ABS等，在受潮状况下加热会与水汽发生催化裂化反应，使制件发生大的应变。 2) some plastics, such as ABS, can be heated in the condition of moisture to catalyze the cracking reaction of the water vapor, making the making of the making a big strain. 3）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。 3) too much plastic regeneration or too high content of raw materials, or too long heating time in the tube, can cause brittle fracture. 4）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。 4) the quality of the plastic itself is not good, such as the distribution of molecular weight, the number of components with uneven structures such as rigid chains is too large; It is also caused by other plastic adulteration, bad additives and dust contamination. 4 工艺方面 4 technological aspects 1）机筒、喷嘴温度太低，调高它。如果物料容易降解，则应提高机筒、喷嘴的温度。 1) the temperature of the nozzle and nozzle is too low. If the material is easy to degrade, the temperature of the cylinder and nozzle should be raised. 2）降低螺杆预塑背压压力和转速，使料稍为疏松，并减少塑料因剪切过热而造成的降解。 2) reduce the pressure and speed of the screw preplasticized back pressure and speed, make the material slightly loose, and reduce the degradation caused by the shear overheating of plastic. 3）模温太高，脱模困难；模温太低，塑料过早冷却，熔接缝融合不良，容易开裂，特别是高熔点塑料如聚碳酸酯等更是如此。 3) the mold temperature is too high. The mold temperature is too low, the plastic is cooled prematurely, the fusion seam is not good, it is easy to crack, especially the high melting point plastics such as polycarbonate etc. 4）型腔型芯要有适当的脱模斜度。型芯难脱模时，要提高型腔温度，缩短冷却时间；型腔难脱时，要降低型腔温度，延长冷却时间。 4) the cavity type core should have proper deformability. When the core is hard to die, the cavity temperature should be raised to shorten the cooling time. When the cavity is difficult to remove, reduce the cavity temperature and lengthen the cooling time. 5）尽量少用金属嵌件，象聚苯乙烯这类脆性的冷热比容大的塑料，更不能加入嵌件注塑. 5) minimize the use of metal, such as polystyrene, such as large plastic, which can not be added into the injection molding.