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Tools Dipped
Injection Moulding
Injection Molding is the technique of injecting molten plastic into a cold mold and forming a part. A schematic of the main elements of a molding machine are shown in figure. It consists of a hopper that holds the raw plastic pellets.
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Dip moulding is a low cost alternative to mould any shape using Plastisol (i.e., Liquid Poly Vinyl Chloride). A mold with mandrel having the shape of the object are first heated to certain temperature and then dipped into plastisol. The heated tools are allowed to remain in the plastisol for certain time, where the plastisol gels on the tools to a thickness of required. The mandrel then is carefully withdrawn from the plastisol and then the plastisol-covered tools are cured at certain temperature for the material to withstand. The final step is to cool the mandrel in water and then strip the finished part from the tool for Quality Check, before packing.

The process of dip moulding technology encompasses a wide variety of products. It remains a viable production process, as the tooling costs are low compared to injection moulding, compression moulding, and rotational moulding. Additionally, dip moulding process has an ability to manufacture multiple numbers of pieces per machine cycle, hence the production costs are typically lower than the others moulding technologies.

Dip molding offers the following advantages over other molding processes
  • It works for high as well as low temperature grades
  • It has excellent thermal & electrical properties
  • It offers a range of grades–anti-static, flame retardant, Medical, Food Grade etc
  • Quick and inexpensive prototypes
  • Significantly low tooling costs
  • Short lead times