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How to solve the burn of injection parts?

329 Published by Sabrina wang Apr 07,2020

How to solve the burn of injection parts?

 

Due to some reasons, injection parts often produce burns. According to burns caused by different reasons such as machinery, mold or molding conditions, the solutions adopted are also different.Need to investigate other reasons such as injection molding machine or mold.

 

Next, let me tell you what solutions should be taken for burns caused by different reasons for injection parts.

 

injection parts

 

Common burns and solutions:

 

1. Mechanical reasons, for example, the overheating of the cylinder due to abnormal conditions, the resin is decomposed at high temperature, and is injected into the product after burns, or the stagnation of the resin due to the threads of the nozzle and screw, check valve, etc. It is brought into the product after being decomposed and discolored, with dark brown burn marks in the product. At this time, the nozzle, screw and barrel should be cleaned.

 

2. The reason for the mold is mainly due to poor exhaust. This kind of burn usually occurs in a fixed place, which is easy to distinguish from the first case. At this time, attention should be paid to measures such as adding exhaust slots to the exhaust rods.

 

3. In terms of molding conditions, when the back pressure is above 300MPa, the barrel will be overheated, causing burns. When the screw speed is too high, overheating will also occur, generally in the range of 40 ~ 90r / min. When there is no exhaust groove or the exhaust groove is small, the injection speed is too high will cause burns of superheated gas.

 

injection parts

 

For the problem of burns of injection parts, it is still important to find out in time.Always pay attention to the maintenance of injection molding machines, molds and other equipment.Hope to help you solve the corresponding problem