If there is Chinese plastic mold injection pressure or hold time the molecules will not be constrained, which allows them to move around uncontrolled during the mold cooling process. This causes the part to cool at different rates and results in injection mold warpage. Tips to possible solution on some common plastic injection molding problems in China. The conditions for injection molding will of course depend on the design of the article, the ratio of the longest glow path to section thickness, and the injection molding machine on which it is molded. The following brief summary of the range of conditions typically met although deviation are possible depending on circumstances in a China mold making factory.

Warping is a distortion in the intended shape of the injection molded part that occurs during cooling. Warping can make the parts twist, fold, bend and bow. Injection mold design should consider the potential for part warping which can be caused by non-uniform mold cooling in a Chinese molding company. The injection molding cycle consists of the injection phase, the pack phase, the hold phase and the cooling phase. At the end of the Hold phase the screw begins to recover and pickup the plastic for the next shot. The set cooling time also begins at the end of the hold phase.The injection molding process consists of various Speeds, Pressures, Times and Temperatures. These process variables determine the quality of the injection molded product in China and therefore, each of these variable must be optimized in order to have an optimized quality of the part. Optimized part quality leads to less scrap, efficient cycle times and an overall improved part quality for a China made mold.