Defects And Solutions Of Transparent Plastic Parts

(1) Silver streaks: due to the influence of internal stress anisotropy during the filling and condensation process, the stress generated in the vertical direction causes the resin to have a flow-up orientation, and the refractive index is different from that of the non-flow orientation, resulting in shiny silk lines. When it expands, it may crack the product.

(2) Bubbles: Mainly because the water vapor and other gases in the resin cannot be discharged. During the condensation process of the mold or due to insufficient filling of the mold, the condensation surface condenses too quickly to form a "vacuum bubble"

(3) Poor surface gloss: mainly due to the large roughness of the mold, on the other hand, the condensation is too early, so that the resin cannot copy the state of the mold surface, all of which make the surface produce small unevenness and make the product lose its luster.

(4) Vibration lines: refers to the dense corrugations formed from the sprue as the center. The reason is that the front-end material has condensed in the cavity due to the excessive viscosity of the melt, and the later material breaks through the condensation surface, resulting in vibration lines on the surface .

(5) Whitening, halo: mainly caused by dust falling into the raw material in the air or the raw material has too much water content.

(6) White smoke, black spots: mainly due to the decomposition or deterioration of the resin in the barrel due to local overheating of the plastic in the barrel.