很多人会疑惑，为什么注塑模具的高温会产生高光泽的塑件呢？现在我们从两个方面来解释这个问题。
Many people will wonder why the high temperature of injection mold will produce high gloss plastic parts? Now let's explain this problem from two aspects.
模具温度对外观的影响：
Effect of mold temperature on appearance:
模具温度过低，熔体流动性降低，可能出现欠注现象；模具温度会影响塑料的结晶度。对于ABS，如果模具温度过低，产品光洁度就会低。与塑料和填料相比，塑料在高温下更容易迁移到表面。
If the mold temperature is too low, the melt fluidity will be reduced, and underinjection may occur; Mold temperature will affect the crystallinity of plastic. For ABS, if the mold temperature is too low, the product finish will be low. Compared with plastics and fillers, plastics are easier to migrate to the surface at high temperatures.
因此，当注塑模具温度较高时，塑料成分更接近注塑模具表面，填充性会更好，亮度和光泽度也会更高。但注塑模具的温度不宜过高。如果过高，容易粘模，塑件部分会出现明显的亮点。如果注塑模具温度过低，也会造成塑件抱得太紧，脱模时容易拉伤塑件，尤其是塑件表面的花纹。
Therefore, when the temperature of the injection mold is high, the plastic composition is closer to the surface of the injection mold, the filling property will be better, and the brightness and gloss will be higher. But the temperature of the injection mold should not be too high. If it is too high, it is easy to stick to the mold, and there will be obvious bright spots in the plastic part. If the temperature of the injection mold is too low, it will also cause the plastic parts to be held too tightly, and it is easy to pull the plastic parts during demoulding, especially the patterns on the surface of the plastic parts.
多段注塑可以解决位置问题。例如，如果产品进胶时有气纹，可以采用分段注塑的方法。在注塑行业，对于有光泽的产品，模具温度越高，产品表面的光泽度越高。相反，如果温度低，表面的光泽度也较低。但是，对于阳光纹理PP材料制成的产品，温度越高，产品表面的光泽度越低。光泽度越低，色差越大，光泽度与色差成反比。
Multi stage injection molding can solve the position problem. For example, if the product has gas lines when it is injected, the method of sectional injection molding can be adopted. In the injection molding industry, for shiny products, the higher the mold temperature, the higher the gloss of the product surface. On the contrary, if the temperature is low, the surface gloss is also low. However, for products made of sun textured PP materials, the higher the temperature, the lower the gloss of the product surface. The lower the gloss, the greater the color difference, and the gloss is inversely proportional to the color difference.
对产品尺寸的影响：
Impact on product size:
如果模具温度过高，熔体会热分解。产品出来后，空气中的收缩率会增加，产品尺寸会变小。模具在低温下使用时，如果零件尺寸变大，一般是由于模具表面造成的。温度过低引起的。这是因为模具表面温度太低，制品在空气中收缩少，所以尺寸要大一些！
If the mold temperature is too high, the melt will be thermally decomposed. After the product comes out, the shrinkage in the air will increase and the product size will become smaller. When the mold is used at low temperature, if the part size becomes larger, it is generally caused by the mold surface. Caused by low temperature. This is because the mold surface temperature is too low, the product shrinks less in the air, so the size should be larger!
原因是：低模温加速了分子的“冻结取向”，增加了模腔内熔体冻结层的厚度，同时低模温阻碍了晶体的生长，从而降低产品的成型收缩率。反之，模具温度高时，熔体冷却慢，松弛时间长，取向度低，同时有利于结晶，制品的实际收缩率为大的。
The reason is that low mold temperature accelerates the "freezing orientation" of molecules, increases the thickness of the melt freezing layer in the mold cavity, and at the same time, low mold temperature hinders the growth of crystals, thus reducing the forming shrinkage of products. On the contrary, when the mold temperature is high, the melt cooling is slow, the relaxation time is long, the degree of orientation is low, and it is conducive to crystallization. The actual shrinkage of the product is large.
如果在尺寸稳定之前启动过程太长，这表明模具温度没有很好地控制，因为模具需要很长时间才能达到热平衡。
If the start-up process is too long before the size is stable, it indicates that the mold temperature is not well controlled, because the mold takes a long time to reach thermal equilibrium.
济南注塑加工厂家认为模具某些部位散热不均匀会大大延长生产周期，从而增加成型成本！恒定的模具温度减少了成型收缩的波动并提高了尺寸稳定性。对于结晶性塑料，模具温度高有利于结晶过程，完全结晶的塑件在储存或使用过程中不会发生尺寸变化。
Jinan injection molding manufacturers believe that uneven heat dissipation in some parts of the mold will greatly prolong the production cycle, thus increasing the molding cost! Constant die temperature reduces the fluctuation of forming shrinkage and improves dimensional stability. For crystalline plastics, high mold temperature is conducive to the crystallization process, and fully crystallized plastic parts will not change in size during storage or use.
但是，高结晶度会导致大的收缩。对于较软的塑料，成型时应采用较低的模具温度，有利于尺寸稳定性。对于任何材料，模具温度恒定，收缩率一致，有利于提高尺寸精度！
However, high crystallinity will lead to large shrinkage. For softer plastics, lower mold temperature shall be adopted during molding, which is conducive to dimensional stability. For any material, the mold temperature is constant and the shrinkage rate is consistent, which is conducive to improving the dimensional accuracy!
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