How to avoid the Air Traps Defects
As plastic fills the mold cavity, it compresses the air that is in the cavity. The pressure of the air pocket increases until the required pressure is achieved to push air out of the mold vents. If the areas where the air is trapped do not have a vent, the pressure of the air pocket will approach the pressure of the injection pressure causing several quality issues. The high pressure air pocket could cause a short shot and/or a poor weld line, and/or burn marks or small black spots on the part.
Because air traps defects are seldom thought of in the design process, it is almost […]