SINGLE-COMPONENT AND TWO-COMPONENT INJECTION OF PLASTIC
Single-component and two-component injection of plastic
The basic material for the production from plastics is a plastic material that is transported in a form of granulation by suckers from the transport packages into the hoppers located in the to part of the injection press. Material suction into the hoppers of injection presses is preceded by the granulation drying. Prepared granulation is consequently withdrawn by the auger located in the plasticization chamber. In the plasticization chamber, the material is melted by the induction heating elements. Consequently, the melt is homogenized by the slowly rotating auger and, under the high pressures, the melted plastic is injected through a so called laminar flow into the compression mould. The injected plastic material is consequently stabilized and cooled down by the cooling system. After the plastic product has been stabilized the mould opens for the plastic part to be removed. After the injection compression mould has been closed again the injection cycle is repeated.
The cycle runs in the same manner as in the single-component operation, however, the two-component injection technology allows combination of two material types or two colours of one plastic type in one moulded piece. The two-component technology differs from the conventional injection by the fact that two injection units are attached to the injection mould.