What are the injection mold exhaust problems?

What are the injection mold exhaust problems?

In the injection molding process, exhaust is a very important problem. Poor exhaust will lead to bubbles, short shots, burning and other defects, affecting the quality of the product.

The following introduces 7 common injection mold exhaust problems and solutions:

(1) Mold design is unreasonable:

The exhaust problem may be caused by unreasonable mold design, such as unreasonable structure of mold cavity and mold core, poor exhaust channel or no exhaust groove.
Solution: Optimize the mold design, ensure the mold cavity, mold core structure is reasonable, set the appropriate exhaust channel and exhaust groove.

(2) Exhaust channel blockage:

The exhaust channel is the channel used to discharge air in the mold, if the exhaust channel is blocked, it will lead to poor exhaust.
Solution: Clean the exhaust channel to ensure that the channel is unimpeded.

(3) Rough mold surface:
The roughness of the mold surface will increase the generation and accumulation of bubbles and affect the exhaust effect.
Solution: Improve the finish of the mold surface, and use polishing and other methods to reduce the generation of bubbles.

(4) Injection molding temperature is too high:
Too high injection temperature will lead to gas inside the molten plastic and affect the exhaust effect.
Solution: Reduce the injection temperature, control the melting state of the molten plastic, and reduce the generation of bubbles.

(5) Injection speed is too fast:
Too fast injection speed will cause the flow of plastic in the mold is not smooth, affecting the exhaust effect.
Solution: Adjust the injection speed to meet the exhaust requirements of the mold to ensure that the plastic can flow smoothly and expel air.

(6) Mold damage or wear:
Mold damage or wear will lead to mold gap increase, affect the exhaust effect.
Solution: Repair or replace the damaged mold parts in time to ensure that the mold clearance meets the requirements and ensure that the exhaust is smooth.

(7) Plastic material problems:
Some plastic materials themselves contain volatile substances and are prone to bubbles.
The solution: Choose the right plastic material, avoid materials containing volatile substances, or take other measures to reduce the formation of air bubbles.

To sum up, the solution of the injection mold exhaust problem needs to be comprehensively considered from the aspects of mold design, exhaust channel, injection temperature, injection speed, mold condition and plastic materials. By optimizing the mold design, keeping the exhaust channel smooth, controlling the injection temperature and injection speed, repairing or replacing the damaged mold parts in time, selecting the appropriate plastic materials, etc., the injection mold exhaust problem can be effectively solved and the product quality can be improved.