1, Causes of poor finish of products
1-1 mold finish is not high
1-2 mold temperature too low
2, Associated knowledge
2-1 because the surface finish of the product (the total area in contact with the mold) is determined by the surface finish of the mold, if the mold finish is not good, the surface finish of the product will be poor due to the small concave and convex surfaces, so in the transparent material products, the light transmittance will also drop, and the transparency will drop.
2-2 because the mold temperature is high, the finish will be better, so a large number of warm water circulation is used in the mold to keep the mold temperature at a certain value, so that the heat of the products is transferred immediately, so that the cycle can be shortened and the products with small residual stress can be obtained.
2-3 in order to get the mold with high finish, it is necessary to plating hard chromium on the surface of mold products, but it is difficult to repair the damaged mold.
3, Solutions
3-1 instant: increase mold temperature
3-2 short term: improve the surface finish of mold products
3-3 long term: use hard mold material and diamond grinding powder for grinding.
4, Due to material differences:
4-1 because the materials with poor fluidity contact with the mold product surface, that is to say, they are solidified immediately, and cannot be well said with the mold product surface. In addition, the evaporation of volatiles in the materials and materials with insufficient pre drying exists between the products and the molds after contact and condensation with the molds, which makes the products become poor finish.
4-2 materials with good forming finish: GPPS, ABS, pp
