Challenges

• The part has a thickness of less than 4 mm and a length of over 700 mm. The mold design features a fan gate structure, resulting in a high flow length ratio of nearly 200.
• The structural part is multicolored, and visible weld lines and color variations occur at the junction of multiple gates.

The following valve gating process parameters were implemented:

These parameters ensure that the product is easily filled without any visible weld lines, resulting in a satisfactory surface finish.

By implementing the valve gating technique with delay times, the challenges of difficult filling and poor surface finish were effectively resolved. This solution proves to be the preferred option for injection molding large-area, flat structural products.