What are the key points that affect the quality of injection molds

When the injection mold is produced, there are often many factors that will affect the quality of the product. To sum up, there are mainly the following four points. The complexity of the performance of the plastic material determines the complexity of the injection molding process. The performance of plastic materials varies greatly due to different varieties, different brands, different manufacturers, and even different batches. Different performance parameters can lead to completely different molding results.

1. Mold steel

Steel is the decisive factor for the quality of the mold, and choosing a reasonable steel is the top priority. Different plastics need to use different steels, such as the requirements for high polishing and corrosion resistance.

2. Plastic materials

The properties of the plastic material determine the complexity of the injection molding process. Different performance parameters can lead to completely different molding results.

                                                                                                                               Folding milk powder cover mold

3. Injection temperature

The melt flows into the cooled cavity, dissipating heat by conduction. At the same time, heat is generated due to shearing, and this part of the heat may be more or less than the heat lost by thermal conduction, depending on the injection molding conditions. The viscosity of the melt decreases with increasing temperature. Thus, the higher the injection temperature, the lower the viscosity of the melt and the lower the required filling pressure. At the same time, the injection temperature is also limited by the thermal degradation temperature and decomposition temperature.

4. Mold temperature

The lower the mold temperature, the faster the heat loss due to heat conduction, the lower the temperature of the melt, and the worse the fluidity. This phenomenon is especially pronounced when lower injection rates are used.

5. Injection time

(1) By shortening the injection time, the shear strain rate in the melt will also increase, and the injection pressure required to fill the cavity will also increase. The injection pressure required to fill the cavity is also reduced.

                               Stationery ruler mould

6.mold maintenance

Mold maintenance is mainly maintenance and maintenance in the production process. If you do not use it for a long time and do not pay attention to maintenance, the service life of the mold may be shortened, and it will be seriously scrapped. Therefore, comprehensive maintenance should be carried out after each use, especially the rust prevention of the molding parts and the rust prevention of the main moving parts. Make sure the mold is dry, and then brush a layer of oil to protect it.