8 kinds of multi-color multi-material injection molding process

Common material combination type

Multi-material injection molding products require not only the combination of different color materials, but also the combination of different kinds of plastic materials, including:

(1) the combination of soft and hard products. In most cases, the combination of soft and hard products is formed by the combination of thermoplastic materials and thermoplastic elastomers (such as TUE, TPU, etc.). This combination can make the products with a hard and corrosion resistant matrix, sealed seismic, or a more comfortable feel, such as handle products.

When forming with different materials, the adhesion between raw materials must be considered, and the different shrinkage rate, thermal expansion coefficient and molding treatment temperature must be considered. When the design allows, the binding strength can be enhanced by mechanical connections or chemical reactions of the internal mechanism.

(2) Products combined with liquid silicone rubber (LSR). Compared with thermoplastic elastomer, LSR has better temperature resistance and mechanical properties, and attaches more and more attention to the application of multi-material injection molding process.

Due to the high mode temperature of LSR, the mold heat insulation problem becomes challenging in the mold design. When forming the LSR, the mold usually requires the design of a cold flow channel system, which must be completely insulated from the thermal flow channel system of forming the thermoplastic material.

In addition, the current materials that can withstand the LSR molding temperature are very limited, such as PA, PPS, PETP are more suitable for LSR binding molding materials.

(3) Products combined with electroplating / conductive materials. The combination of electroplating / conductive material and no electroplating / conductive performance makes it possible to manufacture three-direction conductive conductor parts.

(4) Assembly products in the mold. Two incompatible materials can be combined by injection molding to become a connected and moving part, which we call the mold assembly parts. Due to the different size, shrinkage rate and incompatibility of the molded parts, the injection parts of the two materials can be "active", such as applied in the car air outlet, toys and mechanical connected parts.

Different injection molding units

Multi-color multi-material injection molding machine is composed of two or more injection molding units, according to the arrangement of the injection molding unit (auxiliary shooting table), can be classified into V, L, P and W type.

These several types of multi-color multi-material injection molding machine have their own characteristics, users need to choose according to their own needs. Among them, V-type and L-type are widely used in European injection molding machines, while the Japanese and domestic machines are mostly P-type.

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