Before (改善前)

If the gate is placed on the base of the syringe of a plastic injection molded product, the gate mark will remain in a prominent position. The gate marks become noticeable, so the appearance also worsens.

V

After (改善後)

By changing the design of the plastic mold, changing the gate position moves the gate mark to a position that is less noticeable, thereby avoiding the appearance deterioration. In the case of a syringe, a metal cap is inserted into the head and used, so by changing the gate position on the syringe head side, the gate mark will be hidden by the metal cap.

POINT(要約)

Considering the gate position as well as the product shape when designing medical plastic molds will greatly affect the appearance of the final product.

By paying attention to the following three points, a plastic injection molded product with a beautiful appearance can be manufactured.

1) Determine the gate position for the product in consideration of the fluidity of the resin

2) The design should take into account the strength and load of the mold gate.

(For example, if a gate is placed near a thin core pin, a load will be applied to the core pin of the mold  every time at the injection is performed. It may result the occurrence of burr and shorten the life time of the core pin.)

3) When it is finally implemented into other plastic products or equipment, the appearance is improved by designing to keep the gate invisible position.