The precision injection mold refers to a device that obtains products with a certain shape after the resin material is injected into the metal model. In fact, in order to control the temperature of the mold, there are cooling holes, heaters and other devices on the mold to pass the refrigerant. The material that has become the melt enters the main channel, and is injected into the mold cavity through the runner. After the cooling stage, the mold is opened, and the ejector on the molding machine will eject the ejector rod and push the product out.
The molded product is composed of a main flow path that allows molten resin to flow, a flow path and a product that guide the molten resin into the mold cavity. We usually design the length of the shunt to be equal. Use of recycled materials The main channel and shunt channel in the molded product are not products, and sometimes are discarded or crushed and used again as a molding material. We call it backfeed. Recycled material is generally not used alone as a molding material, but is usually used after being mixed with new materials. This is because after a single molding, the mechanical properties, fluidity, color and other characteristics of the resin will change.
Precision injection molding means that the appearance accuracy of injection molded products should meet strict dimensional tolerances, geometric tolerances and surface roughness. There are many relevant conditions for precision injection molding, and the most essential are the four basic factors of plastic materials, injection molds, injection molding process and injection equipment. When designing plastic products, engineering plastic materials should be selected first, and engineering plastics capable of precision injection molding must select materials with high mechanical properties, stable dimensions, good creep resistance, and resistance to environmental stress cracking. Secondly, the appropriate injection molding machine should be selected according to the selected plastic material, finished product dimensional accuracy, part weight, quality requirements and the expected mold structure.
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