Hopper stuffer

IM machines are available that can process BMC using stuffer mechanisms in the hopper (as in certain extrusion operations see Chapter 3). Depending on the stiffness of the BMC, these machines use a plunger rather than a screw. 

While injection molding machines designed specifically for processing thermoset materials are available, a number of manufacturers offer replacement screw and barrel assemblies and stuffer hoppers to convert conventional thermoplastic injection moulding machines to process thermosets. 

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