Injection mold manufacturersdefects in product production are caused by the injection mold cavity not being filled. The plastic starts to cool and cure without waiting for the cavity to be filled with plastic due to its high viscosity and poor flowability, a phenomenon known as underfilling. This is a common phenomenon of injection molded products, the causes of which may be a variety of, mold is a professional injection mold manufacturer, for the solution of injection mold underfilling problem has a detailed and effective solution.

1 ) Insufficient injection molding machine capacity or insufficient injection volume is a common reason for insufficient loading. A suitable injection molding machine should be selected for the material according to the weight of the product.

2 ) Low injection pressure and material temperature, high plastic viscosity and reduced plastic flow. This phenomenon can increase the temperature of the cylinder or mold, thus increasing the injection pressure.

3 ) The injection speed is slow, and the plastic flowing in the mold takes longer to cool down and rapidly loses its fluidity, resulting in insufficient filling of the mold. The injection speed can be increased appropriately to make the plastic enter the cavity fully before cooling.

4) When the inflow port of the runner is too small, the pressure drop becomes bigger and the flowability of plastic becomes poor. Increase the size of the runner and gate will be fine.

5 ) The mold exhaust is not smooth. For the phenomenon that the residual air pressure in the mold causes the plastic not to be completely filled, it is necessary to open the exhaust slot and moderately reduce the injection speed at the same time to give sufficient time for the exhaust.

There are several main reasons for underfilling of injection molds as mentioned above. We need to know more about injection molds, plastic molds, home appliance molds and other issues. Please call.