Analysis on the causes of the vibration of injection molding products

PS and other rigid plastic parts in the gate near the surface, to the gate as the center of the formation of dense corrugations, sometimes known as vibration. The reason is that when the melt viscosity is too large and the mold is filled in the form of stagnant flow, the material in the front end will condense and contract as soon as it contacts the surface of the cavity, while the later melt will expand the contracted cold material and continue to move forward, which makes the material flow form the surface vibration pattern in the process of moving forward.

Resolvent:

(1) improve the size of runner and gate to prevent excessive resistance.

(2) the mold exhaust shall be good, and a large enough cold well shall be set.

(3) do not design the parts too thin.

(4) raise the temperature of the barrel, especially the nozzle, and also the mold.

(5) increase the injection pressure and speed to make it fill the model cavity quickly.