Introduction to New Technology of Plastic Mould Design and Manufacturing
Plastic molds occupies a very important position in plastics processing. The slow manufacturing ability of mold design has also reflected the industrial level of a country. In recent years, the output and level of plastic molding molds have been developed very quickly, with high efficiency, automation, large-scale, and sophisticated , Long-life molds account for more and more shares. Let’s summarize the development status of molds from the aspects of mold design, processing methods, processing equipment, and appearance treatment.
Gas-assisted molding, gas-assisted molding is not a new skill, but it has been developed rapidly in recent years and some new methods have been presented. The injection assisted by liquefied gas is to inject a preheated, particularly vaporizable liquid into the plastic melt. The liquid is heated in the mold cavity and vaporized and swelled, making the manufacturing hollow, and pushing the melt toward the mold. Cavity appearance, this method can be used for any thermoplastic. Vibrating gas-assisted injection is to apply vibration energy to the plastic melt through the compressed gas of the oscillating product, and then achieve the purpose of controlling the microstructure of the product and improving the function of the product. Some manufacturers convert the gas used in gas-assisted molding into thinner products. It can also produce large hollow products with higher quality and lower cost, but the key point is the leakage of water.
Push-pull molding mold, two or more channels are opened around the mold cavity and connected with two or more injection devices or pistons that can move back and forth. After the injection is completed, the screw or piston of the injection device is before the melt is solidified. Moving back and forth to push and pull the melt in the cavity, this technique is called dynamic pressure holding technique, and its intent is to avoid the problem of large shrinkage when forming thick products with traditional molding methods.