Generally speaking, the complexity of plastic material properties determines the complexity of injection molding process. The properties of plastic materials vary greatly due to different varieties, different processing conditions for producing injection molded parts, different brands and even different batches, which is regular. Therefore, different performance parameters may lead to completely different molding results. Attention must be paid to the setting of performance parameters.

注射时间需要注意，注射时间对注塑件过程的影响表现在三个方面：缩短注射时间，熔体中的剪切应变率也会提高。(1)由于塑料熔体的剪切变稀特性，熔体的粘度降低，为了充满型腔所需要的注射压力也要降低。(2)为了充满型腔所需要的注射压力也要提高(3)剪切发热越大，同时因热传导而散失的热量少,因此熔体的温度高,粘度越低，为了充满型腔所需要的注射压力也要降低。以上三种情况共同作用的结果，使充满型腔所需要的注射压力的曲线呈现“U”形。存在一个注射时间，此时所需的注射压力小

Injection time should be paid attention to. The influence of injection time on the injection process is reflected in three aspects: shortening the injection time will also improve the shear strain rate in the melt. (1) 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. (2) The injection pressure required to fill the cavity should also be increased. (3) the greater the shear heating, and the less the heat lost due to heat conduction, so the higher the temperature of the melt and the lower the viscosity, the lower the injection pressure required to fill the cavity. As a result of the joint action of the above three cases, the curve of the injection pressure required to fill the cavity presents a "U" shape. There is an injection time when the required injection pressure is small

注射温度也是需要注意的。熔体流入冷 却的型腔，因热传导而散失热量。与此同时，由于剪切作用而产生热量，这部分热量可能较热传导散失的热量多，也可能少，这是多方面的因素导致的，主要取决于注塑件条件。另外熔体的粘性随温度升高而变低。性能如此变化。这样，注射温度越高，熔体的粘度越低，所需的充填压力越小。这种变化不一而语，同时，注射温度也受到热降解温度、分 解温度的限 制。

The injection temperature also needs attention. The melt flows into the cooled cavity and loses heat due to heat conduction. At the same time, the heat generated by shear may be more or less than that lost by heat conduction, which is caused by many factors and mainly depends on the conditions of injection molded parts. In addition, the viscosity of the melt decreases with the increase of temperature. Performance changes like this. 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 thermal degradation temperature and decomposition temperature.

在这个注塑加工中，不同条件对制品的影响是多样化的。塑料的材料性能不同，参数不同导致的。注塑制品的注塑条件，温度越高，粘度也就越低，压力越小。这是注射温度，在多因素下的表现。影响温度的因素是多样化的，溶体温度越低，流动性就越差。就是注射时间，它有几大表现需要注意，若溶体中的剪切应变速率提高，则所需注射压力也要提高。若粘度降低，则注射压力要降低;若溶体温度高，

In this injection molding process, the effects of different conditions on products are diverse. It is caused by different material properties and parameters of plastics. For injection molding conditions of injection molded products, the higher the temperature, the lower the viscosity and the lower the pressure. This is the performance of injection temperature under multiple factors. The factors affecting the temperature are diverse. The lower the solution temperature, the worse the fluidity. It is the injection time. There are several major manifestations that need to be paid attention to. If the shear strain rate in the solution increases, the required injection pressure also increases. If the viscosity decreases, the injection pressure should be reduced; If the solution temperature is high,

粘度低，注射压力也要降低。这个压力曲线呈U型存在。这是注塑加工对产品的影响。

If the viscosity is low, the injection pressure should also be reduced. The pressure curve is U-shaped. This is the impact of injection molding on products.