For high-precision plastic parts and difficult to master shrinkage, the following methods are generally used to design the mold:
The outer diameter of plastic parts is smaller than that of plastic parts.
To determine the form, size and molding conditions of the casting system.
The size change of the plastic parts to be reprocessed is determined after reprocessing (measurement must be made 24 hours after demoulding.
Adjust the mold according to the actual shrinkage.
Die retest and change process conditions to slightly correct shrinkage value to meet the requirements.