| 塑料周转箱为什么会发脆？ |
| 添加时间：2018/9/25 15:56:41 浏览次数： |
| 一、模具方面 First, mold aspects （1）浇口太小，应考虑调整浇口尺寸或增设辅助浇口。 (1) gate is too small, we should consider adjusting 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 shunt is too small or misconfigured, we should try to arrange a reasonable balance or increase the size of the bypass. （3）模具结构不良造成注塑周期反常。 (3) the mold structure is not good, resulting in abnormal injection cycle. 二、设备方面 Two, equipment （1）机筒内有死角或障碍物，容易促进熔料降解。 (1) there are dead corners or obstacles in the barrel, which is easy to promote the degradation of molten materials. （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) Machine plasticizing capacity is too small, plastics in the barrel is not fully plasticized, machine plasticizing capacity is too large, plastics in the barrel is heated and sheared for too long, plastics are easy to aging, so that products become 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 ejection device is tilted or unbalanced, with small cross section or improper distribution. 三、原料方面 Three. 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 raw materials of plastic turnover boxes are mixed with other impurities or improper or excessive 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) Too many times of plastic regeneration, too high content of recycled materials, or too long heating time in the barrel, will promote the brittle cracking of parts. （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) Poor quality of plastics, such as high molecular weight distribution, excessive proportion of components with non-uniform structures such as rigid molecular chains, or contaminated by other plastics doping, bad additives, dust and other impurities are also the causes of brittleness. 四、工艺方面 Four. 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 cylinder and nozzle is too low to raise it. If the material is easy to degrade, the temperature of the cylinder and nozzle should be increased. （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 back pressure and rotational speed of screw pre-plastics, make the material slightly loose, and reduce the degradation of plastics due to shear overheating. （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, it is difficult to demould; the mold temperature is too low, the plastic is too early to cool, the fusion seam is not good, easy to crack, especially for high melting point plastics such as polycarbonate. （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 core of the cavity should have an appropriate release angle. When the core is difficult to demolde, the cavity temperature should be increased and the cooling time shortened. When the cavity is hard to escape, the cavity temperature should be reduced and the cooling time prolonged. （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 inserts, such as polystyrene, such as brittle plastics with large specific capacity of cold and heat, not to add the insert injection molding. 五、制品设计方面 Five. Product design （1）塑料周转箱带有容易出现应力开裂的尖角、缺口或厚度相差很大的部位。 (1) The plastic revolving box has sharp corners, notches or parts with great thickness difference which are prone to stress cracking. （2）塑料周转箱设计太薄或镂空太多。 (2) the plastic turnover box is too thin or hollow. |
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