The rotational speed of the screw significantly affects […]
The rotational speed of the screw significantly affects the degree of stability of the injection moulding process and the amount of heat acting on the plastic. The faster the screw rotates, the higher the temperature. When the screw rotates at a high speed, the friction (shear) energy transmitted to the plastic increases the plasticizing efficiency, but at the same time increases the unevenness of the melt temperature.
Due to the importance of the surface speed of the screw, the screw rotation speed of the large injection moulding machine should be small for the smaller injection moulding machine, because the shear heat generated by the large screw is much higher than that of the small screw at the same rotation speed. Due to the difference in plastics, the speed at which the screw rotates is also different.
The evaluation of the syringe press is usually based on the amount of PS that can be injected per injection and may be measured in ounces or grams. Another type of aligning system is based on the volume of melt that the injection moulding machine can inject. The evaluation of the injection moulding machine is usually based on the amount of PS that can be uniformly melted in one hour or heated to a uniform melt temperature (in pounds and kilograms). This is called plasticizing ability.