Critical Points For PVC Injection Molding Process

Product design and mold design should pay attention to the following points: 1. The product should not have sharp corners or mutations as far as possible, and the thickness should not change much to prevent PVC degradation.

2. The die should have a drawing inclination of more than 10 degrees, and reserve about 0.5% shrinkage.

3. The flow channel design of the mold should pay attention to several points. The injection port of the mold should be slightly larger than the nozzle hole and larger than the diameter of the main channel, so that the PVC material does not flow into the mold cavity and the pressure can be balanced. Try to use a cut gate to prevent slag from flowing into the product and also to keep the temperature of the product from being cooled. The gate should be designed at the thickest wall of the product, and the width is sufficient, and the length is preferably between 6-8mm to make the PVC material flow smoothly. In order to support the pressure drop and easy release, the flow channel is preferably round, and the diameter is between 6-10mm according to the size and weight of the product.

4. The mold temperature should have a cooling water control device, so that the mold temperature can be controlled between 30 ° C and 60 ° C.

5. The surface of the mold should be smooth and chrome-plated to prevent corrosion.