什么是氣泡？氣泡是空氣無法從模具中逃出而殘留在制品中而構成的。 氣體被前鋒冷料包住而不能從模具間隙，入子孔，排氣孔等排出。 氣泡方位通常在充填的區域。構成氣泡的緣由通常是由于在充填區沒有排氣孔或排氣孔不夠大。 另一個通常緣由是產品有急速的肉厚變化（肉厚的地方優先充溢）。
What is a bubble? Bubbles are formed when air cannot escape from the mold and remains in the product. The gas is surrounded by the front cold material and can not be discharged from the center of die gap, inlet sub hole, exhaust hole, etc. The bubble orientation is usually in the filling area. The reason for forming bubbles is usually that there is no vent hole in the filling area or the vent hole is not large enough. Another common reason is that there is a rapid change in the thickness of the product (where the thickness of the meat is preferred to overflow).
The cause of bubbles
未逃逸的氣領會在產品內構成真空或氣泡， 短射了（未充溢） ,未排出的氣領會在產品內構成氣泡，或由于熄滅而在制品外表產生污點。為了除掉氣泡， 我們能夠經過減小打針速度， 添加排氣， 或者在恰當的方位設置排氣孔來改良充溢方式。
The air that has not escaped forms a vacuum or bubble in the product, shoots (not overflowing), and the air that has not been discharged forms a bubble in the product, or causes stains on the surface of the work in progress due to quenching. In order to remove bubbles, we can improve the filling method by reducing the injection speed, adding exhaust gas, or setting exhaust holes in the proper position.
In the following illustration, the bubble is due to the excessive flow length to wall thickness share. In this case, the exhaust can be added by changing the thickness share or by setting an exhaust hole (for example, adding a thimble) in the bubble forming area.
1. Product design
Change product design to reduce thickness share. This reduces the effect of flow length.
2. In mold design
Pay attention to the setting of the air vent.
Add vent holes in the overflow area.
在零件間特意設置排氣孔， 例如， 分型面， 入子孔，頂針孔，滑塊。
Specially set vent holes between parts, such as parting surface, sub hole, thimble hole and slide block.
3. Design the sprue system from scratch
The way of filling can be changed by changing the sprue system. The method is to make the post filling area located in the proper exhaust position.
4.排氣孔足夠大 ,要確保在注塑時氣體能及時逃逸但是，要留意的是，排氣孔太大就會產生毛邊。 舉薦排氣孔尺度結晶性塑料是 0.025 毫米 （ 0.001 英吋）， 非結晶性塑料是0.038 毫米 （ 0.0015 英吋）。
4. The vent hole is large enough to ensure that the gas can escape in time during injection molding. However, it should be noted that if the vent hole is too large, there will be burr. It is recommended that 0.025 mm (0.001 inch) of crystalline plastic and 0.038 mm (0.0015 inch) of non crystalline plastic should be used for vent size.
5. Adjust forming conditions
Reduce the injection speed.
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