How to replace different materials during injection molding?

How to replace different materials during injection molding ?

For general thermoplastic materials, it is easy to stick to the metal surface when the temperature is high, and it is not easy to stick to the metal surface when the temperature is low. The replacement operation is to use the nature of the material to stick the material to be replaced on the inner wall of the hot heating material cylinder. Above, rotate the high-viscosity material (replacement material) to remove the material that you want to extrude. These are our basic considerations. In this case, it is recommended to keep the temperature on the screw side as low as possible, and do not replace the material that you want to replace. Material.

Sticking to the screw is the most important thing.

Therefore, high-density PS or special replacement materials are used in replacement materials.

The general sequence and precautions for the replacement of dissimilar materials are as follows:

1. The temperature of the heating cylinder should be kept lower than the actual forming temperature as much as possible before the replacement operation is completed.

2. The number of screw rotations is as low as possible. In addition, the back pressure of the screw is reduced to prevent the temperature rise of the material caused by frictional heat.

3. Use a small amount of replacement material every time the screw is supplied, and try to avoid the dissolved resin entangled on the screw.

4. Make the screw advance in a short stroke and inject resin with multiple impacts. This operation is very effective.

5. If the inner wall of the heating barrel, the outer diameter of the screw head and other parts are damaged, there is dissolved resin in this part, and it is difficult to replace it.

Yisheng is a comprehensive technology company specializing in research and development, production, sales and operation of micro-energy harvesting, passive and risk-free kinetic energy technology. The company has strong capabilities in R&D and design of various injection products, mold processing, surface treatment and final assembly. Since its establishment, it has been adhering to the trust concept of "honesty, credibility, prudence, and effectiveness", taking "integrity-based and compliance management" as the core philosophy of the company, and continuously improving the company's asset management capabilities and risk control capabilities. Welcome to inquire!