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PE Pipe Fitting Mould Injection Molding
- Aug 30, 2017 -

PE pipe mold injection molding The most important three conditions are temperature, pressure and time: Temperature: PE pipe is a thick-walled parts, in order to avoid the cooling temperature is too large lead to internal stress, barrel temperature should take a lower value. Barrel temperature distribution, generally from the hopper to the nozzle temperature from low to high, so that the smooth rise of plastic temperature to achieve the purpose of uniform plasticization. To prevent plastic overheating, so the temperature near the nozzle section is slightly lower. Mold temperature on the inherent performance of products and the appearance of a great impact on the quality of PE, in addition to filling speed, the mold temperature will also directly affect the product of the crystallinity and crystal configuration. Therefore, the polyethylene (PE) pipe mold suitable for the use of medium mold temperature, for polyethylene (PE) materials, the cooling rate is appropriate, the plastic crystallinity is moderate, with good physical and mechanical properties. Pressure: The pressure in the injection process includes both back pressure and injection pressure. When using a screw type injection molding machine, the pressure at the top of the screw when the screw rotates is called back pressure.

In general, the increase in back pressure increases the temperature uniformity and mixing uniformity of the polyethylene (PE) melt. Increasing the back pressure also facilitates the removal of the gas from the melt and increases the melt density to increase the injection volume of the machine. For polyethylene (PE) raw materials, increasing back pressure increases the melt's temperature, composition and color uniformity. Time: During the entire molding cycle, the injection time and the cooling time have a decisive influence on the quality of the product.