Plastic injection molding defects remedial

Plastic injection molding defects remedial  

Most causes and countermeasures with most of the problems related to the stabilization period.
Forming a drawback, someplace in the machine performance, injection mold design, or material properties outside itself, most reliable adjustments to resolve the problem. Some of the reasons for the shortcomings and limited to certain reasons, some disadvantage is that excess and deficiency of the same reasons.

Warpage

Warpage is a common defect in plastic injection molding where the part becomes distorted or bent out of shape. This is usually caused by uneven cooling or shrinkage during the molding process. To prevent warpage, the mold temperature should be increased or the part should be designed with thicker walls. If warpage has already occurred, it can be remedied by using a secondary operation like heat treatment or applying pressure to the affected area.

Shrinkage and sink

Use the fastest speed to make plastic injection mold surface has begun to harden hit, can not
replenish shrinking. Reduce the injection rate and increased injection pressure, mold venting, etc.
Increase in plastic injection molding pressure measurement and improve or increase the dwell time
Reduce mold temperature
Maintain or increase the pressure filling pressure

Short Shots

Short shots occur when the plastic does not completely fill the mold cavity during the injection molding process. This is usually caused by insufficient injection pressure or cooling time. To prevent short shots, the injection pressure and cooling time should be increased. If short shots have already occurred, they can be remedied by adding more material to the affected area or using a secondary operation like welding or gluing.

Compressed air tank to produce high temperature, if the shooting appeared to lack of insufficient
the pressure to improve the filling pressure appears burned black.
Improve stomatal
Reduce the rate of fire and the end of the plastic temperature
Avoid the use of recycled materials
Runner increase

Burn mark

Burn marks are discolorations or black spots that appear on the surface of a plastic part. They are caused by overheating or burning of the plastic during the molding process. To prevent burn marks, the mold temperature and injection speed should be reduced. If burn marks have already occurred, they can be remedied by sanding or polishing the affected area.

Flash

Flash is the excess plastic that is pushed out of the mold and onto the parting line during the molding process. This defect is caused by excessive injection pressure or clamping force. To prevent flash, the injection pressure and clamping force should be reduced. If flash has already occurred, it can be remedied by trimming the excess material with a knife or using a secondary operation like sanding or polishing.