Causes and solutions for failure of transparent plastic parts
The defects are probably as follows:
(1) Silver streak: During the filling and condensing process, the internal stress anisotropy affects the stress generated in the vertical direction, causing the resin to flow upwardly, and the non-flowing orientation produces a different refractive index and produces a flashing silk thread. When it is expanded, it may cause cracks in the product. In addition to the attention in the injection molding process and mold (see the table, the best product for annealing treatment. If the pc material can be heated to 160 ° C or more for 3 to 5 minutes, then naturally cool.
(2) Bubbles: The water vapor and other gases in the resin are not discharged, (during the mold condensation process) or due to insufficient filling, the condensation surface is too fast to condense to form a "vacuum bubble". The method of overcoming is shown in the table.
(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 can not copy the surface of the mold, all of which makes the surface of the cattle produce small unevenness, which makes the product tarnish. The method of overcoming is shown in the table.
(4) Seismic pattern: refers to the dense corrugation formed from the sprue center. The reason is that the melt viscosity is too large, the front end material has been condensed in the cavity, and then the material is broken through the condensation surface, and the surface is damaged. . The method of overcoming is shown in the table.
(5) Whitening. Haze: mainly caused by dust falling into the raw material in the air or the moisture content of the raw material is too large. The method of overcoming is shown in the table.
(6) White smoke. Black spots: mainly due to plastics in the barrel, due to local overheating, the barrel resin is decomposed or deteriorated. In order to clearly illustrate the measures taken to overcome these deficiencies, a list is provided for your reference.
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