Flash defect: There are extra thin slices on the edge of the injection molded parts. The reason is that the mold is not closed tightly or the injection pressure is too high. The solution is to inspect the mold, adjust the clamping force, and appropriately reduce the injection pressure to ensure that the plastic melt does not overflow.
Bubble problem: There are bubbles inside the product. It may be due to insufficient drying of the plastic, and the moisture vaporizes during injection. It is necessary to fully dry the raw materials, increase the barrel temperature, and extend the injection cycle to allow the gas to be fully discharged and improve the product quality.
Sink mark phenomenon: The product surface is sunken. Usually, it is due to insufficient holding pressure and the plastic shrinks during cooling. The holding time and pressure should be increased, and the mold cooling system should be improved to make the product cool evenly and reduce sink marks to ensure a flat appearance.
Visible weld lines: There are marks at the junction of two plastic melt streams. Low mold temperature and slow injection speed are likely to cause this problem. Increase the mold temperature, speed up the injection speed, and optimize the gate position to promote good fusion of the melt and fade the weld lines.
Silver streaks: There are streaky patterns on the surface. Mostly, it is because the plastic is decomposed or mixed with impurities. Replace clean raw materials, reduce the barrel temperature to prevent the plastic from overheating and decomposing, and clean the screw and barrel to avoid impurity mixing.
Dimension deviation: The size of the injection molded part does not match the design. The reasons include mold wear and fluctuations in process parameters. Regularly maintain the mold, accurately control injection temperature, pressure, and time, and use measuring tools to monitor to ensure accurate dimensions.
Deformation defect: The shape of the product is irregularly distorted. Uneven cooling is the main cause. Optimize the mold cooling channels, balance the cooling efficiency of each part, and reasonably design the wall thickness of the product to reduce internal stress and prevent deformation.
