The Types of Rubber Molding

    Injection Molding is when an uncured rubber strip is fed through a screw barrel into a heated, closed mold (the mold is specific to the part and may have multiple cavities). The screw pushes a measured amount of rubber through a system of gates and runners into the cavities. The pressure of the press holds the mold closed. The rubber is held in the heated cavity for a specific amount of time to properly cure the rubber into its final shape.

    Compression molding is when a preform (specific size and weight of uncured rubber) is placed into the open mold. The heated mold (specific to the part) is then closed using hydraulic pressure. The rubber is held in the heated cavity for a specific amount of time to properly cure the rubber into its final shape.

    Transfer Molding is molding is when a preform (specific size and weight of uncured rubber) is placed into the transfer pot. The ram is then closed pushing the uncured rubber through the runner and gate system into the part cavity. The pressure of the press holds the mold closed. The rubber is held in the heated cavity for a specific amount of time to properly cure the rubber into its final shape.