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What are the influences of process conditions on products during Shanghai injection molding process?


Author: MULAN -Plastic Molding Manufacturer

The complexity of the molding process of injection molded products often determines the complexity of material properties. That is recognized. However, the performance of plastic materials varies greatly due to differences in varieties, grades, manufacturers, and even batches.

It is also based on rules. So different performance parameters may lead to completely different molding results. Pay attention to performance parameter settings, this must be kept in mind.

The following Guangdong Plastic Mold Factory will introduce the influence of process conditions on products during Shanghai injection molding process: Pay attention to injection temperature. Due to heat conduction, the melt flows into the cooling cavity and loses heat. At the same time, due to the heat generated by the shearing action, this part of the heat may be more or less than the heat lost by heat conduction. This is caused by many factors and mainly depends on the condition of the injection part.

In addition, the viscosity of the melt decreases with increasing temperature. This changes performance. The higher the injection temperature, the lower the melt viscosity and the lower the filling pressure required.

This is unpredictable, and at the same time, the injection temperature is also limited by the thermal degradation temperature and decomposition temperature. We all know that there are many factors that affect the temperature. The lower the mold temperature of the injection molded part is, the lower the mold temperature will be. The faster the loss rate due to heat conduction is, the lower the melt temperature will be and the worse its fluidity will be. Furthermore, this phenomenon is especially evident when lower injection speeds are used.

Therefore, it is not easy to use the low-rate conditional method. The impact of injection time on the Shanghai injection molding process is mainly manifested in three aspects: shortening the injection time, the shear strain rate of the melt will also increase (1) the injection pressure required for cavity filling. (2) Due to the shear thinning of the plastic melt, the viscosity of the melt is reduced, and the injection pressure required to fill the cavity is also reduced.

(3) The greater the shear heat, the less heat is lost by heat conduction, so the higher the temperature of the melt, the lower the viscosity, and the pressure required to fill the cavity will also decrease. The above three conditions work together to make the pressure curve required to fill the cavity be“u”shape. There is an injection time at which the lowest injection pressure is required.

In this Shanghai injection molding process, various conditions have various effects on the product. Plastic materials have different properties and parameters. In the injection state of injection products, the higher the temperature, the lower the viscosity and the lower the pressure.

It is a multifactorial injection temperature. The factors influencing the temperature are diverse, and as the temperature of the solution decreases, its fluidity becomes worse. Finally, the injection time is mainly manifested in several aspects: If the shear strain rate in the solution increases, the injection pressure needs to be increased.

When the viscosity decreases, the injection pressure decreases, and when the melt temperature is high and the viscosity is low, the injection pressure decreases. The pressure curve is U-shaped. It is the influence of process conditions on products during Shanghai injection molding process.

For more information about injection molds, please visit the official website of Xingye:

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