Clear Corrugated Plastic Sheets Because the plastic has the light weight, the toughness is good, the molding is easy. Low cost advantages, so in modern industry and daily-use products, Clear Corrugated Plastic Sheets more and more plastic replacement glass, especially for optical instruments and packaging industry, the development is particularly rapid. But it is better to ask for transparency, wear resistance to high, impact toughness is better, so the composition of plastic, injection molding process, equipment, molds, etc., Clear Corrugated Plastic Sheets to make a lot of work to ensure that these are used in lieu of glass plastic (hereinafter referred to as transparent plastic), good surface quality, so as to meet the requirements of use. At present, the general use of transparent plastic in the market is Poly methyl methacrylate (commonly known as the Asian Afterburner or plexiglass, code-named PMMA), polycarbonate (Generation PC). Polyethylene terephthalate glycol fat (code name Pet), transparent nylon. Clear Corrugated Plastic Sheets As (propylene-eye a styrene copolymer), Polysulfone (code PSF) and so on, which we contact most of the PMMA, PC and pet three kinds of plastic, due to the limited space, the following on the three kinds of plastic for example, discuss the characteristics of transparent plastic and injection molding process.
First, transparent plastic performance transparent plastic must have a high degree of transparency, followed by a certain degree of strength and wear resistance, Clear Corrugated Plastic Sheets can resist impact, heat resistance is good, chemical resistant to be superior, bibulous rate is small, only this can meet the requirements of transparency and long-term unchanged, the following list table 1, compared with the performance of PMMA, PC and pet.
Second, transparent plastic injection process should pay attention to common problems transparent plastic due to high transmittance, it is necessary to require the surface of plastic products strict quality, can not have any markings, stomata, white. Fog halo, black spots, discoloration, Clear Corrugated Plastic Sheets gloss and other defects, and thus in the entire injection process of raw materials, equipment. Mold, and even product design, should pay attention to and put forward strict or even special requirements. Secondly, because of the high melting point of transparent plastic, poor fluidity, so as to ensure the surface quality of products, Clear Corrugated Plastic Sheets often in the machine high temperature, injection pressure, injection speed and other technological parameters for fine adjustment, so that injection molding material can be filled with mold, and will not produce internal stress caused by deformation and cracking.
The following is in preparation for the raw material. To the equipment and tooling requirements, injection molding process and raw material handling of several aspects, to discuss matters needing attention.
(a) Preparation and drying of raw materials because of any impurity in the plastic, may affect the transparency of the product, so in the storage, transportation, Clear Corrugated Plastic Sheets feeding process, we must pay attention to seal, to ensure that raw materials clean. In particular, the raw materials contain moisture, heating will cause deterioration of raw materials, so must be dry, and in the injection molding, feeding must use dry hopper. It is also important to note that during the drying process, the input air should preferably be filtered and dehumidification to ensure that it will not contaminate the raw materials.
(ii) The cleaning of cylinders, screws and accessories to prevent raw material contamination and the existence of existing materials or impurities in the screw and attachment sag, special thermal stability of the resin exists, so before and after the use of the screw cleaning agent to clean the pieces, so that it can not be sticky impurities, when there is no screw cleaning agent, the use of PE, Clear Corrugated Plastic Sheets PS resin cleaning screw. When temporary downtime, in order to prevent raw materials at high temperature stay for a long time, causing degradation, should be dryer and barrel temperature reduction, such as PC, PMMA and other barrel temperature to be reduced to 160 Shan below. (Hopper temperature for PC should be reduced to 100 Shan below)
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