Silver grain ": in the process of filling and condensing, the internal stress anisotropy, the vertical direction of the stress, so that the resin flow on the orientation, and the non-flow orientation of the refractive index is different from the flash silk pattern, when its expansion, may cause cracks in the product. In addition to the injection molding process and mold attention outside (see table, the best products for annealing treatment.) If the PC material can be heated to 160 ℃ above to maintain 3-5 minutes, then natural cooling can be. （
"Bubble": the main resin in the water vapor and other gases do not go out, (in the mold condensation process) or due to insufficient filling, condensation surface and too fast condensation formed "vacuum bubble."
"Surface Gloss Difference": The main mold roughness is large, on the other hand condensation premature, so that the resin can not copy the surface of the mold, all these make the surface of the cow small uneven, and the product lost luster.
"Shock pattern": refers to the formation of the direct gate from the center of the dense ripple, the cause of the melt through the large, the front-end material has been in the cavity condensation, and then the material to break through the condensation surface, and the surface of the earthquake pattern. Its overcoming method see table.
"Pan-white": Fog Halo: Mainly due to dust in the air into the raw materials or raw material water content is too large.
"White smoke": black spots: mainly because of plastic in the barrel, due to local overheating and the machine cylinder resin produced decomposition or deterioration of the formation. Its overcoming method see table.