Plastic bottles for your introduction, transparent plastic due to higher light transmittance, a necessary requirement plastic surface strict quality requirements, can not have any markings, pores, whiten. Halo fog, black spots, discoloration, poor gloss and other defects, and thus the entire injection molding process for raw materials and equipment. Mold, and even product design, have very strict attention and make even special requirements. Second, because of transparent plastic, mostly high melting point, poor mobility, so as to ensure the quality of the product surface, often at high temperature machine, injection pressure, injection speed and other parameters to make minor adjustments to make when both full of plastic injection mold, without will produce internal stress caused by deformation and cracking products. Plastic bottles to introduce you to, so from raw material preparation, equipment and tooling requirements, raw material injection molding process and product processing aspects of the operation should be carried out strictly.
       First, the material preparation and dry at any point because it contains impurities in plastics, are likely to affect the transparency of the product, therefore, and storage, transportation. Feeding process, we must pay attention to the seal, to ensure that the raw material is clean. Especially raw materials containing water, can cause deterioration of raw materials is heated, so be sure to dry, and during the injection, you must use the drying hopper feeding. Also note that the drying process, the air entered should preferably be filtered, dehumidified, in order to ensure that no contamination of raw materials. Plastic bottles to introduce you to its drying process such as drying process transparent plastic: materials technology drying temperature drying times material thickness Remarks pmma70 ~ 802 ~ 430 ~ 40pc120 ~ 130> 6 <30 using hot air drying cycle pet140 ~ 1803 ~ 4 continuous dry feeding device better
      Second, clean barrel, screw and its attachments to prevent contamination of raw materials or impurities, and there are old screw and accessories depression, especially poor thermal stability of resin exist, so before use, are applied after the shutdown of the screw cleaning agent clean all parts, it may not stick with impurities, when there is no screw cleaning agent, available pe, ps and other resin cleaning screw. When the temporary shutdown to prevent raw material at high temperatures to stay a long time, causing the drop solution should be drier and barrel temperature decreases, such as pc, pmma such as barrel temperature should be reduced to below 160 ℃.
      Third, in the mold design should pay attention to the problem in order to prevent back flow of poor or uneven cooling adverse plastic molding, surface defects and deterioration, usually in the mold design should pay attention to the following points. a = wall thickness should be uniform, stripping slope large enough; b = transition should be gradual. Smooth transition to prevent any sharp corners. Produce sharp edges, especially pc product must not have gaps; c = gate. Runner as large, chunky, and the location of the gate should be set according to the contraction of the condensation process, add cold slug well when necessary; d = mold surface should be smooth, low roughness; e = vent. Tank must be sufficient, and when the exhaust gas air and melt; f = except pet outside, not too thin wall thickness, usually not less than lmm.