Four tips to improve the precision of thin-wall injection molding The application range of plastic parts is becoming more and more extensive, from simple tableware and kitchen utensils to complex mechanical parts and electronic product shells. However, for plastic parts with high precision requirements such as electronic product shells, the precision requirements should be paid attention to from the mold manufacturing during injection molding.
What factors determine the precision of plastic parts during the injection molding process? How can we improve the precision of thin-walled injection molded parts?
- Mold closing pressure: In principle, it should be greater than the total pressure of plastic injection into the mold, with no burrs as the benchmark.
- Pressure and speed have a partial similar relationship. The purpose of acting in the mold is to make the raw materials enter the mold evenly, thoroughly, and fill every corner appropriately. Too low will cause short shot, shrinkage, too high will cause burrs, oversaturation, sticking to the mold, burning, easy to damage the mold and high internal stress.
- The speed determines the condition of the raw materials in the mold runner and the finished product. Fast will cause burrs, oversaturation, burning, slow will cause short shot, shrinkage, poor combination and easy breakage, etc.https://solidcomould.com/product-category/injection-mould/
- The temperature of raw materials is different, and the temperature is different. If the temperature is too low, the melt glue will not be transparent, resulting in uneven color and increased internal stress of the finished product. If the temperature is too low and the pressure is too high, the screw may break. If the temperature is too high, the product will have burrs. The temperature difference caused by cooling will cause shrinkage. The raw materials will decompose, turn yellow, change color, and break easily. The cooling time will be longer, and the gas will not be easy to discharge.
