How do manufacturers prevent internal voids in thick PVC sculpture castings?
Internal voids in thick PVC sculpture castings can compromise structural integrity and aesthetics. Manufacturers employ several techniques to prevent these defects:
1. Proper Material Preparation: Ensuring PVC resin and additives are thoroughly mixed eliminates air pockets and inconsistencies.
2. Controlled Pouring Speed: Slow, steady pouring reduces turbulence, minimizing air entrapment.
3. Vacuum Degassing: Applying vacuum pressure removes trapped air bubbles before casting.
4. Optimized Cooling Rates: Gradual cooling prevents shrinkage voids by allowing uniform material contraction.
5. Mold Design: Venting channels and strategic gating systems help air escape during casting.
By combining these methods, manufacturers achieve void-free, high-quality PVC sculptures.
