THE EFFECT OF VAPOR CHAMBER IN AN INJECTION MOLDING PROCESS ON PART TENSILE STRENGTH

Abstract

Weld lines can be eliminated using three methods. First, the melt temperature may be increased. The viscosity of the molten plastic decreases with increasing temperature, which improves the flow pattern of the plastic, and reduces the depth of the V-notch of the welding lines. However, degradation of the material strength sometimes occurs if the melt temperature is too high. The second method involves increasing the number of vents. Increasing the number of vents (ejecting pins or inserts) at the vicinity of the weld line will enable air to be dispelled from the mold cavity more easily. Nevertheless, extra vents will leave marks on the product surfaces, especially with transparent plastics. Finally, the mold temperature can be raised. Raising the mold temperature increases the viscosity of the material, which in turn can reduce the depth of the V-notch. However, increased mold temperature also increases the cycle time of the injection molding process, thus increasing production costs. If increased cycle time is not a problem, then raising the mold temperature is the simplest of the three methods for eliminating weld lines discussed above. There are several methods for raising the mold temperature. Replacing the water in the mold temperature controller with oil can increase the mold temperature roughly 100