Reusable Bag Molding

reusable bag molding - a low cost closed molding system

Reusable Bag Molding (RSBM) is the fastest and easiest closed mold process to implement in a production shop. With excellent part-to-part consistency and ease of conversion from open molding, RSBM has become a viable alternative to open molding for numerous applications. Reusable Bag Molding incorporates a rigid “A” side or base mold and a flexible “B” side or counter mold that is made with silicone, latex or other rubber-like products. The bag may be made by brushing or spraying silicone material on the base mold and incorporating seals where the bag meets the mold flange. Like other closed mold processes, the base mold is charged with fiberglass, the flexible counter mold is put in place and a vacuum is drawn through ports incorporated into the bag. Catalyzed resin is introduced through the resin ports using a low pressure injection pump and the cavity is filled and cured. The advantages of Reusable Bag Molding include low tooling costs (existing open mold tooling can be easily converted), a reusable and repairable bag, significant reduction in HAP emissions, and ease in training operators with a relatively simple technology.

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