Why do bubbles appear in the injection mold?

Why do bubbles appear in the injection mold?

I believe that many friends have encountered the problem of bubbles in the injection mold during the production of the injection mold. Especially as some friends who have just entered the industry, they will be helpless when they encounter this problem for a while. Dongguan Yuzhuo has 10 A professional injection mold manufacturer with many years of experience in injection molds, today will analyze the causes and solutions of bubbles in injection molds.

Defects in the mold design caused bubbles in the injection mold

For example: poor injection gate position of injection mold, too small gate, asymmetric gate arrangement of multi-gate parts, small flow channel, unreasonable mold cooling system, too large difference in mold temperature, etc., resulting in molten material in the mold cavity The flow is discontinuous, blocking the passage of air.

The mold parting surface lacks necessary exhaust holes or insufficient exhaust holes

Blockages, poor location, and there are no processing gaps such as inserts and thimble to exhaust, resulting in the air in the cavity can not be at the same time when the plastic enters Leave. These reasons can also cause bubbles in the injection mold.

Finally, if the surface roughness of the injection mold is poor and the frictional resistance is large, local hot spots are caused, and the decomposition of the passing plastic will also cause bubbles to appear.

Of course, in addition to the reasons for the mold, there will be equipment, process, raw materials and other reasons; so every process in the production process of injection molds needs to be very careful, try to avoid the occurrence of bubbles in the injection mold, and reduce product production. The defective rate in the process can increase the competitiveness of injection mold manufacturers in the increasingly competitive mold industry.

Plastic Mold
the authorPlastic Mold