Open casting molding polyurethane

  Open casting molding method is the simplest and most commonly used molding method. In this method, the mixture of prepolymer and chain extender is poured into an open mold preheated to 80-120°C and coated with a release agent. After normal pressure vulcanization reaches the strength, it can be demolded and transferred to the post-vulcanization process.

When pouring, you must be careful not to get air in to avoid air bubbles in the molding. It is better to use a casting machine.

For products with strict size requirements, the products need to be cut after molding. Consider the shrinkage of elastomer when designing the mold. Larger products can also be poured by manual batch method if skilled. The mold strength requirement of this method is not high, and it can be processed and manufactured with soft metals such as aluminum, and even can be processed with reinforced plastics. Polyurethane rubber rollers, rubber wheels and other products are commonly produced by this method.