How to solve the problem of orange peel pattern or pitting on the surface of Dalian blow molding products?

Dalian blow molding products, also known as hollow blow molding, is a rapidly developing plastic processing method. With the birth of high-density polyethylene and the development of blow molding machines, blow molding technology has been widely used.

The volume of hollow containers can reach thousands of liters. Some production has adopted computer control. The plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc. The resulting hollow containers are widely used as industrial packaging containers.

According to the parison production method, blow molding can be divided into extrusion blow molding and injection blow molding. The newly developed ones are multi-layer blow molding and stretch blow molding.

Cause:

① Poor mold exhaust

② Mold leakage or condensation in mold cavity

③ Poor plasticization of parison and melt fracture of parison

④ Insufficient inflation pressure

⑤ Slow inflation rate

⑥ The blowing expansion ratio is too small

Solution:

① Sand blasting treatment shall be carried out for mold blank, and exhaust holes shall be added

② Repair the mold and adjust the cooling temperature of the mold to above the "dew point"

③ Reduce the screw speed and increase the heating temperature of the extruder

④ Increase the inflation pressure

⑤ Clean the compressed air channel and check whether the blowpipe leaks

⑥ Replace the mold sleeve and core to improve the blow expansion ratio of parison

The "orange peel" of injection molded products means that the surface of injection molded products has a pattern like orange peel, with slight depression and bulge.

This phenomenon is mainly caused by the uneven surface tension of injection molding products. It is caused by the uneven surface of materials flowing from places with low surface tension to places with high surface tension.