PP rainwater storage module

Common problems and solutions of PP rainwater module

1、 Concave holes and varying colors

Concave holes often occur in PP rainwater module products. For such products, a model design with injection ports or flow channels around it should be adopted. In response to the phenomenon of uneven color distribution in molded products, it is necessary to increase the screw back pressure and strengthen the mixing of fillers.

2、 Overflow edge

Sometimes PP material overflowing from the mold cavity can cause burrs. At this point, it is necessary to first reduce the filling amount, lower the holding pressure, and shorten the holding time, and pay attention to repairs.

3、 Poor demolding performance

Poor demolding performance refers to the difficulty in removing PP rainwater module molded products from the mold or deformation during the removal process. Materials with adhesive properties are prone to this problem, but it can be improved by adding release agents to the material or coating them on the mold before molding. Insufficient cooling (insufficient curing) of molded products can also lead to such problems, so it is necessary to thoroughly cool the molded products. In addition, unreasonable mold design can also become a reason for difficulty in demolding, especially in areas such as injection ports and injection channels that are easy to stick to the mold. Increasing the extraction angle of the injection port and widening the injection channel are very effective.