Causes and solutions of pinch lines (welding marks)

Weld marks are an important factor affecting quality of plastic parts. Research has found that under same process conditions, strength of weld line area is only 10-92% of original material, seriously affecting normal use of injection molded products. For example, in automobile industry, unqualified plastic parts directly lead to a decline in automobile quality and even endanger people's lives. Therefore, it is of great practical significance to study formation process and influencing factors of weld marks, find ways to eliminate weld marks.

Four reasons and solutions for weld lines in injection molded parts

Weld lines are an important factor affecting quality of plastic parts. Study found that under same process conditions, strength of weld line area is only 10-92% of original material, which seriously affects normal use of injection molded products. For example, in automobile industry, unqualified plastic parts directly lead to decline of automobile quality, even endanger safety of human life. Therefore, it is of great practical significance to study formation process of weld lines, influencing factors and to find ways to eliminate weld lines.

Mould Design of Decorative Parts of Vacuum Cleaner Panel

Small buckle structure is shown in Figure 1. Material is PP, and there is a long inner hole on the side, which needs to be formed by a side core pulling mechanism. Due to large number of flat surfaces of plastic parts, size of buckle and through hole is more important, and accuracy of other dimensions is relatively low.