How to efficiently refuel in the injection molding process?

For the replacement of dissimilar materials, before and after material replacement, we use the difference in the melt viscosity of various materials to perform the work. The temperature control of the barrel should be determined in advance. For general thermoplastic materials, high temperature visitors tend to stick to metal surfaces, and low temperatures make them less likely to stick to metal surfaces. Replacement uses this property of the material to make the material that you want to replace (think out) sticky. On the hot wall of the heating cylinder, then supplying the high-viscosity material (replacement material) to the cold screw to remove the material to be extruded, these are our basic considerations. At this time, the temperature on the screw side is kept as low as possible. The temperature is good, making the material that you want to replace stick to the screw is the most important. Therefore, a material with a low fused viscosity is suitable for use in the replacement material, and high-density PS or special replacement materials are generally used. The general sequence and precautions for the replacement of dissimilar materials are shown in the following procedure:
1. The temperature of the heating cylinder is until the end of the replacement operation. It is kept as low as possible compared to the actual forming temperature.
2. The number of screw revolutions is as low as possible. Also, reduce the back pressure of the screw to prevent the temperature of the material from rising due to frictional heat.
3. each time the supply screw in a small amount of replacement material, as much as possible so that the molten resin wrapped around the screw.
4. The screw is advanced in a short stroke, and the resin is ejected in a plurality of times in an impact manner. This kind of operation is very effective.
5. When the outer diameter of the head of the screw is damaged by heating the inner wall of the barrel, melted resin is present in this part, and it becomes difficult to retain the replacement work.