什么是气泡？气泡是空气无法从模具中逃出而残留在制品中而构成的。 气体被前锋冷料包住而不能从模具间隙，入子孔，排气孔等排出。 气泡方位通常在充填的区域。构成气泡的缘由通常是由于在充填区没有排气孔或排气孔不够大。 另一个通常缘由是产品有急速的肉厚变化（肉厚的地方优先充溢）。
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
未逃逸的气领会在产品内构成真空或气泡， 短射了（未充溢） ,未排出的气领会在产品内构成气泡，或由于熄灭而在制品外表产生污点。为了除掉气泡， 我们能够经过减小打针速度， 添加排气， 或者在恰当的方位设置排气孔来改良充溢方式。
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.
在零件间特意设置排气孔， 例如， 分型面， 入子孔，顶针孔，滑块。
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.排气孔足够大 ,要确保在注塑时气体能及时逃逸但是，要留意的是，排气孔太大就会产生毛边。 举荐排气孔尺度结晶性塑料是 0.025 毫米 （ 0.001 英吋）， 非结晶性塑料是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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