Haiying mixed two-color injection molding machine leads into the new field of multi-color injection molding technology, the production does not need to re-develop the mold, the use of the original mold to achieve a multi-color function, this model is equipped with twin screw barrel group and special design compound nozzle, twin screw can be controlled by computer exchange injection, simultaneous injection, gradual injection and other multi-function selection operation. The compound nozzle is specially designed to transform and enhance the color mixing effect. It can produce special patterns and multi-layer color plastic parts, and can also change color, pattern and shape arbitrarily. In addition, when the machine does not produce mixed color products, as long as the auxiliary cylinder function is closed, the main cylinder can produce monochrome plastic products as the monochrome injection molding machine. The use of Haiying mixed two-color injection molding machine to produce plastic products, directly enhance the added value of the product, rebuild the second spring of the mold, and create additional profits.

Our company uses plastic injection molding heating section is divided into three sections, four sections, five sections. The temperature control of the cylinder and nozzle of the injection machine is a closed cycle control mode, that is, the heating resistance ring is controlled and adjusted by comparing the verified value of the thermocouple. There are four basic forms of temperature control for injection molding machines: Our factory uses switch control type and proportional differential integral control. (a) switch control (ON/OFF) type This type of heat energy conversion component is a resistance heating ring, and its output state is in the form of a switch. Figure 24 shows the output state and temperature characteristic curve under the switch control mode. It can be seen from the characteristic curve that this switching type temperature control has large overshoot, large temperature fluctuation and instability.

Ratio, integral, differential control (PID) control type, according to the deviation signal generated by continuous temperature measurement, improve the temperature control accuracy. As mentioned earlier, the cylinder wall of the injection molding machine is relatively thick, so the selection of thermocouple detection points must be considered when controlling the temperature of the cylinder, because their temperature curves are very different at different detection points.