• Rotationally Molded Anesthesia Masks
  • Mooring Balls

What is Rotational Molding?

Often referred to as 'roto molding' in the dip molding industry, rotational molding with plastisol is used to create hollow parts like: 

  • Disposable anesthesia masks
  • Boating bumpers
  • Mooring balls
  • Plastic doll parts

What Steps are Involved in the Rotational Molding Process?

A thermoplastic process that uses a clamshell mold to manufacture hollow plastic pieces from plastisol, rotational molding follows these steps to create PVC products: 

  1. Open clamshell mold and pour in the plastisol material.
  2. Rotate mold to heat the liquid within.
  3. As the material moves and heats, it will coat the inside of the mold, sticking to the walls.
  4. When all material has covered the walls of the mold, continue rotating until the liquid plastisol gels and fuses. 
  5. Let the mold cool.
  6. When completely cool, the mold can be opened to reveal a solid plastic piece that is hollow in the middle.

How Does Piper Plastics Rotational Mold with Plastisol?

Here at Piper Plastics, we can develop custom clamshell molds for the items our customers would like to develop. We fill our two-piece clamshell molds with just the right amount of plastisol and rotate them carefully, using multiple axes for optimal consistency.

Our unique process allows us to product intricate, hollow parts made from PVC. For more information about the rotational molding process and other processes we offer, please contact us at 800-966-9919