Experimental results indicate that(1) the predicted rules accord well with the actual ones;(2) the welding strength improves with the delay time of opening the valve gate;and(3) if the downstream valve gate does not open until the melt from the upstream valve gate passes it,the weldline strength is almost equal to that of the part in the location without weld line.

Influences of Injection Process Parameters on Property of Weld Line of Injecton-molded Part;

Analysis and Countermeasure of Weld Line of Large Injection-moulded Product;

Eliminate weld lines in automotive door handle;

In order to obtain the best gate location addition, the position of air bubbles and weld lines were forecasted.

In order to obtain the best gate location addition,the position of weld lines and the clamp force were forecasted.

A L9 experimental matrix design based on Taguchi method was conducted to reslove the defect of weld lines in fiber-reinforced PA66 injection molding.

Approach to avoid weld mark in large-scale plastic part;

The control principle of valve-injection on weld marks is analyzed based on studying the forming mechanism of weld marks.

The formation principle of weld mark in extrusion product was analyzed finely.

For most of the injection plastics, the seams, like other flaws, result far from one factor.

With regard to the seam problem occurred in PP_R pipe production, through theoretical analysis and calculation, it was found out that the inappropriate design of the feeding system was the main cause of the seam.

On the basis of theoretic analysis and calculation,through optimizing the position of gate and reasonably configuring technical parameters with the help of Plastic Advisor,the seam of PP-R fitting with thick walls will be reduced to the least,thus providing reliable technical assurance.