Views: 0 Author: Site Editor Publish Time: 2022-06-18 Origin: Site
Due to the high light transmittance of the PETG jar, the surface quality of PETG products must be strict, without any markings, pores, and whitening, haze, black spots, discoloration, poor gloss, and other defects, so PETG scraps and equipment are used throughout the injection molding process. The design of PETG jar molds and even products must pay great attention to and put forward strict and even special requirements. Secondly, because most PETG jars have high melting points and poor fluidity, to ensure the surface quality of the products, manufacturers of PETG scraps often need to make fine adjustments to process parameters such as temperature, injection pressure, and injection speed, so that the PETG can be filled with the mold. It will not produce internal stress and cause product deformation and cracking. So what are the points of attention in PETG jar injection molding? Let's take a look together next.
The following is a list of contents:
Preparation and drying of PETG jar scraps
Cleaning of PETG jar barrel, screw, and accessories
Problems that should be paid attention to in the design of PETG jar mold
Since any impurities in the PETG jar may affect the transparency of the product, the PETG jar must be sealed during storage, transportation, and feeding to ensure that the PETG scraps are clean. Especially PETG leftovers contain water, which will cause PETG leftovers to deteriorate after heating, so it must be dried, and when PETG jar injection molding, a drying hopper must be used for feeding. It should also be noted that during the drying process, the input air should be filtered and dehumidified to ensure that the PETG jar scraps will not be polluted.
Buying PETG jar scraps manufacturers to prevent PETG scraps pollution and old materials or impurities in the recesses of the screw and accessories, especially the presence of resin with poor thermal stability, so the screw cleaner should be used to clean all parts before using the PETG jar and after stopping the machine. Make it free of impurities. When there is no screw cleaning agent, the PETG jar screw can be cleaned with pe, ps, and other resins. When temporarily shutting down, to prevent the PETG jar scraps from staying at a high temperature for a long time, causing the solution to drop, the temperature of the dryer and barrel should be lowered.
Buying PETG jar scraps manufacturers to prevent poor backflow or uneven cooling, resulting in the poor molding of PETG jar, surface defects, and deterioration, generally, the following points should be paid attention to when designing the mold.
1. The wall thickness of the PETG jar should be as uniform as possible, and the draft angle should be large enough.
2. The transition part should be gradually and smoothly transitioned to prevent the PETG jar from having sharp corners and sharp edges, especially for PC products.
3. The gate and runner of the PETG jar should be as wide and short as possible, and the gate position should be set according to the shrinkage condensation process, and a cold well should be added if necessary.
4. The surface of the PETG jar mold should be smooth and low in roughness (preferably lower than 0.8).
5. PETG jar vent holes and vent slots must be sufficient to discharge air and gas in the melt promptly.
6. Except for pets, the wall thickness should not be too thin, generally not less than 1mm.
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