很多人（rén）會疑惑，為什麽注塑模具的（de）高溫會產生高光澤的塑件呢？現在（zài）我們從兩個方麵來解釋這個問題。
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（mó）具溫度對外觀的影響：
Effect of mold temperature on appearance:
模具溫（wēn）度過低，熔體流動性（xìng）降（jiàng）低，可能出現欠注現象；模具溫度會影響塑（sù）料（liào）的結晶（jīng）度。對於ABS，如果模（mó）具溫度過低，產品光潔度（dù）就（jiù）會低。與塑料和填料相比，塑料（liào）在高溫（wēn）下更容易遷移到表麵。
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，當注塑模具溫度（dù）較高時，塑料成分更接近注塑模具表麵，填（tián）充性會更好，亮度和光澤度也（yě）會更高。但注塑模具的溫度不宜過（guò）高。如果過高，容易粘模，塑件（jiàn）部（bù）分會出現（xiàn）明顯的亮點。如果注塑模具溫（wēn）度過低，也會造成塑件抱得太緊，脫模時容易拉傷塑件，尤其是塑件表麵的花紋。
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.
多段注塑可以解決位（wèi）置問（wèn）題（tí）。例如，如果產品進膠時有氣紋，可以采用分段注塑的方法。在注塑行業，對於有光澤的（de）產品，模具溫度越高，產品表麵的光澤度越高。相（xiàng）反，如果溫度低（dī），表麵的光澤度也較低。但是，對於陽光紋理（lǐ）PP材料製（zhì）成的產品，溫度越高，產品表麵的光澤度越低。光澤度越低，色差越大，光澤（zé）度與色差成反比。
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.
對產品尺（chǐ）寸的影響：
Impact on product size:
如果（guǒ）模具溫度（dù）過（guò）高，熔體會熱分解。產品出來後，空氣中的收縮率會增（zēng）加，產品尺寸會變小。模具在低溫下使用時，如果零件尺寸變大，一般是（shì）由（yóu）於模具表麵造成的。溫度過低引起的。這是因為模具表麵溫度（dù）太低，製品在空氣中收縮少（shǎo），所以尺寸（cùn）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（shì）：低（dī）模溫加速了分子的“凍結取向”，增加了模腔（qiāng）內（nèi）熔體凍結層的厚度，同時低模溫阻礙了晶體的生長，從而降低產品的成型收縮率。反之，模具溫度高時（shí），熔體（tǐ）冷卻慢（màn），鬆弛時（shí）間長（zhǎng），取向度低（dī），同時有利於結晶（jīng），製品的實際收（shōu）縮率為大的。
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.
如果在尺寸穩定之前（qián）啟動過程太長，這表明模具溫度（dù）沒有（yǒu）很好地控製（zhì），因為模具需要很長時間才（cái）能達到熱平（píng）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.
濟（jì）南注塑加（jiā）工廠家認為（wéi）模具某些（xiē）部位散熱不均勻會大大延長生產周期，從而（ér）增加成型成本！恒定的模具溫度減少了成型收（shōu）縮的波動並（bìng）提高（gāo）了尺寸穩定性。對於結晶性塑料（liào），模具溫度高有利於（yú）結晶過程，完全結晶的（de）塑件在儲存或（huò）使用（yòng）過程中不會發生尺寸（cùn）變化。
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，高結晶度會導致大（dà）的收縮。對於（yú）較軟的塑料，成型時應采用較低的模具溫度，有利於尺寸穩（wěn）定性。對於任何材料，模具溫度恒定，收縮（suō）率一致，有（yǒu）利於（yú）提高尺寸精（jīng）度（dù）！
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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