Celplast needs to be typically dried before molding for best results. Insufficient drying or preheating may lead to following issues while processing.
The drying temperature should be ideally between 70deg C (160deg F) to 85degC (185degF). Drying at temperatures higher than this may be harmful to the plastic.
Drying time depends on the general atmospheric conditions and duration for which the plastic had been stored.
Ideally molds should be vented to avoid surface deformities due to gas trapped in the mold.
Proper temperature differentials need to be maintained between the plastic object and the mold. This must be determined by trial on a case to case basis. If necessary, mold temperatures should be controlled by water circulating systems. If the mold is too hot the material will stick in the mold and if it is insufficiently heated then it will be difficult to fill the mold.