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Mold making and casting is a fascinating activity which can take varied forms. From clay modeling to making simple one-part molds or the more complicated approach of two-part molds. In fact, mold makers even make multi-part molds at times to capture all facets and other details of the model. The procedure of making molds also varies from pouring the mold making material to spraying it or even brushing it on the model.Apart from the regular blanket, glove and even shell type, another making and casting technique is injection molding. It is actually a simple procedure in which the casting material is forced into this under pressure!Injection molding can be done in single or multi-part molds. Since it is favored for capturing minute details, generally complicated two-part molds feature in injection molding. Tiny holes (called sprues) are bored into the mold all along its surface. This is where the casting material will be injected into this.The casting material like polyurethane resin is filled in a syringe and the large hypodermic needle is inserted into the mold sprues.
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