来源：六合历史开奖记录 发布时间：2019-12-13 18:36:48 点击：
Mold failure because the surface of the plastic part is a replica of the surface of the mold cavity, if the surface of the mold has surface defects such as scars, corrosion, micropores, etc., copying them to the surface of the plastic part will lead to poor glossiness. If the surface of the cavity is greasy and wet, excessive use of demulsifier or improper selection will also make the plastic surface black. Therefore, the surface of the mold cavity should have a good finish, and it is better to use a polished or chrome plated surface. The cavity surface must be kept clean, and oil and water stains shall be removed in time. The type and dosage of release agent shall be appropriate.
Mold temperature also has a great influence on the surface quality of plastic products. Generally speaking, the surface gloss of different types of plastics varies greatly under different mold temperatures. Too high or too low mold temperature will cause poor glossiness. If the mold temperature is too low, the melt solidifies immediately after contacting the cavity, which will reduce the reproducibility of the cavity surface. In order to increase the glossiness, the mold temperature can be increased. It is better to use warm water in the cooling circuit of the mould, so as to transfer heat rapidly in the mould cavity and avoid prolonging the forming cycle. The method can also reduce the residual stress in the die. In addition, the stripping slope is too small, the section thickness is too steep, the rib is too thick, and the section of gate and sprue is too small or changes suddenly. The surface quality of plastic parts will be affected by mold faults such as turbulent flow and poor mold exhaust, which will lead to poor surface gloss.
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