How to use bottle cap mould to produce high quality bottle cap products

The cavity size of the cap mold is obtained from the size of the plastic product plus the estimated shrinkage rate, and the shrinkage rate is a value within a range recommended by the plastic manufacturer or the engineering plastics manual, which is not only related to the casting of the mold. The form of the gate and the location of the gate are related to the distribution, and are related to the crystal orientation (anisotropy) of the engineering plastic, the shape and size of the plastic product, and the distance and position to the gate. The main factors affecting the plastic shrinkage are thermal shrinkage, phase change shrinkage, orientation shrinkage, compression shrinkage and elastic recovery, and these influencing factors are related to the molding conditions or operating conditions of precision injection molding products.

Therefore, the relationship between these influencing factors and injection conditions and their apparent factors must be considered when designing the mold, such as injection pressure and cavity pressure and filling speed, injection melt temperature and mold temperature, mold structure and gate form and distribution. , and the influence of gate cross-sectional area, product wall thickness, content of reinforcing fillers in plastic materials, crystallinity and orientation of plastic materials and other factors. The influence of the above factors is also different due to different plastic materials, other molding conditions such as temperature, humidity, continuous crystallization, internal stress after molding, and changes in injection molding machines.