tpe \ tpr why in the injection molding products appear black spots and solutions.

　　1: melt overheating coking, injection speed is too high, for small gates melt will be degraded due to shear heat generation and degradation, and make the product appear black spots.

　　TPE/TPR injection molding defect problem solutions; can reduce the barrel temperature, adjust to reduce the injection speed, screw speed, back pressure, etc..

　　2: dissolved material in the barrel or mold runner stay too long, and make the products appear black spots.

　　Solutions to TPE/TPR injection molding defect problems.

　　Adjust the injection cycle, check the mold runner, screw, over rubber head, over rubber ring, flange inner wall and other parts of the mold for coked rubber adhesion, if so, it needs to be cleaned.

　　3: The raw material infiltrates impurities and is contaminated, which makes the products appear black spots.

　　TPE/TPR injection molding defect solutions; check whether there are impurities in raw materials, pollution, if so, need to clean up.