Problems and Improvement Methods in the Molding Site: Methods for Improving Weld Lines
What is a weld line? Here are various methods to improve it.
A weld line is a phenomenon that occurs when resin splits into two streams and then rejoins in products that have multiple gates or contain windows or holes, due to the fact that the surface of the combined resin is slightly solidified. The basic method to visually eliminate it is to create conditions under which the surface of the joining resin is less likely to solidify. Methods such as "raising the mold temperature to delay solidification under molding conditions" cannot completely eliminate it, but can reduce the visibility of weld lines to a certain extent. To completely eliminate it, it is necessary to heat the mold to a temperature close to that of the resin. This method is called "heat & cool." Since the product will not release while the mold is heated, production is carried out by rapidly cooling the mold. [Methods to reduce the visibility of weld lines] ■ Raising the mold temperature to delay solidification under molding conditions ■ Setting a fast injection speed to thin the surface solidification layer ■ Setting a higher resin temperature ■ Setting a higher resin pressure *For more details, please refer to the PDF document or feel free to contact us.
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