Plastic during the injection molding, in-house products sometimes bloomings appear, and if plastics are transparent member, it will seriously affect the quality of plastic products, resulting in product failure, so why have plastic blooming it? When the product bloomings, plastic products factory is generally how to solve these problems?
1. The vacuum blooming, this blooming is mainly caused due to plastic shrinkage, plastic wall thickness at the time of cooling, since the cooling speed of the surface than the intermediate cooling faster, which would lead to lack of adhesive at the center of the plastic article , creating a vacuum-like. Solve such vacuum bloomings by reducing the injection speed, increase the injection pressure, increased feeding, high melt viscosity grade materials to improve.
2. As the rubber compound ingredients to hit the gas. Such bloomings can be solved in two ways, 1. lengthen drying material time, of plastic materials sufficiently dry. 2. Reduce the temperature of rubber, plastic decomposition avoid more gas.
3. Since the gas illiquid plastic produced, these bloomings we can be resolved by increasing the resin and plastic mold temperature, increase the injection rate.
These are the injection molding process, because plastic bloomings generated and solutions.