Specification for surface finish of plastic parts

The surface roughness of plastic parts affects the appearance quality of plastic parts. The lower the surface roughness of the plastic part, the higher the appearance quality of the plastic part. So what are the factors that affect the surface roughness of injection mold parts?

1) Injection mold forming process

The factors that affect the surface roughness of injection molded plastic parts are to avoid defects such as cold scars, moiré lines, and blisters during the molding process as much as possible.

2) Surface roughness of injection mold parts

The surface roughness of plastic parts is generally 1.6~02μm. There are no requirements on the surface roughness of plastic parts. Its roughness is generally 1-2 grades higher than the surface roughness of plastic parts.

NBCHAO reminds you: During the molding process, due to the wear of the injection mold cavity, the surface roughness of the mold continues to increase, and the surface roughness of the plastic parts also increases, so it should be polished and restored after a period of use. For transparent plastic parts, the cavity of the injection mold and the surface roughness of the core material are required to be the same.