During the process of mold manufacturing, various problems can arise. Today, we will discuss the solutions to plastic mold forming defects and flow marks based on poor mold forming. Flow marks are traces of residual molten resin flowing through the surface of the formed product. For shaped products such as household appliances and cosmetic containers that value appearance, they can be considered quality issues based on their severity. During the flow process of molten resin in the mold cavity, if the temperature difference between the contact part of the mold surface and the front end of the resin is too large, flow marks will be generated.

Countermeasures for molds

1、 Increase the surface temperature of the mold cavity.

2、 Expand the size of the mold gate.

3、 Expand the size of the flow channel.

4、 Ensure the size of the cold material cavity.

Countermeasures for injection molding process

1、 Increase injection pressure.

2、 Increase injection speed.

3、 Fully ensure measurement and increase buffer capacity.

4、 Extend the pressure holding time.

5、 Increase the resin temperature.

6、 Increase the diameter of the front end of the nozzle.

Countermeasures for the design of formed products

Reduce the change in wall thickness of the formed product.