Injection molding process products

The complexity of the properties of plastic materials often determines the complexity of the injection molding process. Under normal circumstances, the complexity of the material is not the result we want. The performance of plastic materials varies greatly due to different varieties, different brands, different manufacturers of injection moulded parts, and even different batches. Therefore, it is necessary to make corresponding adjustments according to the properties of the material. Different performance parameters may lead to completely different molding results. This is also a different situation that everyone is happy to see.

Second is the injection temperature. This is a very important item. The melt flows into the cooled cavity and loses heat by heat conduction. A certain amount of heat is lost. At the same time, due to the heat generated by shearing, this part of the heat may be more than the heat lost by heat conduction, or it may be less, mainly depending on the conditions of the injection parts. This also causes some heat loss. The viscosity of melt decreases with increasing temperature. In this way, the higher the injection temperature, the lower the viscosity of the melt and the smaller the filling pressure required. At the same time, the injection temperature is also limited by the thermal degradation temperature and decomposition temperature. This limitation causes a change in temperature.

The third is the mold temperature of injection parts. Is the mold temperature the higher the better or the lower the better? The lower the temperature of the injection mold, the faster the heat loss due to heat conduction, the lower the temperature of the melt, the worse the fluidity. The level of temperature also affects the speed of liquidity. This is especially true when lower injection rates are used. If you don't believe me, if conditions permit, don't bother to do a test.

Injection time. The length of time has a certain impact on the injection molding industry. The influence of injection time on the process of injection parts is reflected in three aspects: 1, shorten the injection time, the shear strain rate in the melt will also increase, so the injection pressure required to fill the cavity will also increase. 2, shorten the injection time, the shear strain rate in the melt is increased, due to the shear thinning characteristics of the plastic melt, the viscosity of the melt is reduced, and the injection pressure required to fill the cavity is also reduced. This is exactly the opposite of the first point.

3, shorten the injection time, the shear strain rate in the melt increases, the larger the shear heat is, and the less heat is lost due to heat conduction, so the temperature of the melt is higher, the viscosity is lower, and the injection pressure required to fill the cavity is also reduced. As a result of the combined action of the above three conditions, the curve of injection pressure required to fill the cavity shows a "U" shape. That is, there is an injection time when the injection pressure required is low. This is the impact of injection time on the injection molding process.

The effect of injection molding process conditions on the product is described above. Injection molding has certain special significance for plastic materials, injection temperature, mold temperature, and injection time. The plastic material determines the complexity of injection molding. The injection temperature causes the viscosity to rise or fall. The mold temperature causes the difference in fluidity. Injection time is different, injection pressure is also different.

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