Collapsible core system, unscrewing ejection demoulding together with curve sliding system, and PPR over molding, are the main technics during plastic piping injection molding.
If you still prefer to get the best fitting mold from Taizhou, please contact me.
Fine solution to solve PPR molding shrinkage problem due to thickness; fast unscrewing demoulding tech, etc.
Offer you quality molds with delivery, with competitive cost.
Lucia
focaremould@yahoo.com