Solution to The Problem of Gas Lines in Injection Molding of Center Console

During the injection molding process of center console, gas lines often appear at the water inlet of PC plastic products, mainly because the injection speed is too fast. To solve this problem, we need to reduce the injection speed and avoid the occurrence of vibration lines and material shortage.

1. Increase the melt temperature

First, make sure that the melt temperature is high enough. It is recommended to increase the melt temperature to 310℃ without discoloration or browning, especially for PC7025A and PC1250Y materials.

2. Increase the mold temperature

Secondly, the mold cavity temperature needs to be increased to 90 to 110℃. During the production process, for molds with cores, the purpose of heating can be achieved by turning off the mold cooling water. When the mold temperature reaches above 90℃, the injection speed can be very slow, so that the gas lines at the water inlet will gradually fade as the injection speed decreases until they disappear.

3. Adjust the injection speed

Once the molten glue flows through the area where the gas pattern is formed, it is necessary to switch back to high-speed and high-pressure injection immediately to avoid vibration and material shortage of the injection molded parts.

4. Control the mold temperature

It should be noted that the mold temperature should not exceed 120℃, otherwise the injection molded parts may shrink and the cooling time will be extended, resulting in a decrease in production speed. In addition, the service life of the mold will be shortened due to high temperature, and the surface may appear dull.

5. Safety considerations

For the safety of workers, try to avoid using a hot oil machine to increase the mold temperature. If a hot oil machine must be used, be sure to pay attention to safety and avoid oil leakage accidents.

6. Handling thin and large beer parts

For thin and large injection molded parts, the heat of the molten glue dissipates quickly, and the mold temperature is difficult to increase, which may affect the filling effect. In this case, a heating pipe can be added to the mold for heating, and the width of the water inlet can be increased to increase the flow rate of the molten glue filling and reduce the filling time, thereby helping to fill the cavity and eliminate gas patterns.

7. Hot water inlet design

If the mold can be changed to a hot water inlet design, it will be very helpful to solve the problem of gas marks.

The above method can effectively reduce the gas mark phenomenon at the water inlet during the injection molding process of the center console and improve product quality.