2-shot injection molding
From Plastics Wiki, free encyclopedia
This technology produces a part with two different raw materials or colors in a single operation. The machine has two injection units: one vertical and one horizontal. By using a rotating mold, the machine automatically produces a substrate of one resin or color and overmolds the part with the second resin or color.
Contents |
Raw Materials
Most raw materials can be used. The resin is in pellet form before processing.
Tooling
High pressures are involved, so steel tooling is used.
Cost
Insert molding and complex secondary operations are eliminated. Painting (which can rub off) is eliminated. Strong substrates can be molded with soft-feel materials on the outside. Two-color applications can enhance appearance.
Advantages
Insert molding and complex secondary operations are eliminated. Painting (which can rub off) is eliminated. Strong substrates can be molded with soft-feel materials on the outside. Two-color applications can enhance appearance.
Disadvantages
High tooling cost.
Applications
Handles, triggers, knobs, dials and switches.
Process: Injection molding cycle Reaction injection molding, Reinforced reaction injection molding, Liquid injection molding, Gas-assist injection molding, Coinjection molding, 2-shot injection molding, Fusible core injection molding, Rapid injection molding, Micro injection molding
Equipment: Injection molding machine(Vertical, Horizontal), Injection molding press, Injection mold (Hot runner, Cold runner), Injection unit (Injection ram, Injection screw), Clamping unit (Toggle , Hydraulic, Hydromechanical), Plunger injection molding, Injection molding machine manufacturers, Types of injection molding machines
Terms: Injection pressure, Injection rate, Clamping pressure
See also: Plastic thermoforming • Blow molding • Plastic welding • Plastic extrusion • Rotational molding
