What is an injection screw- Zhoushan Jiading Plastic Machinery Co., Ltd.

The application of plastic products is closely related to our life. Injection molding and extrusion molding are currently processed as energy-saving processing methods. Among them, the plastic plasticizing screw is the most important key component, and each plastic has its own physical characteristics, which makes the design of the plastic plasticizing screw different. For the design of plastic plasticizing screw, the rule of thumb has been used in the past, and the cost is high and the problem cannot be solved. Therefore, some details in the design of plastic plasticizing screw are worthy of our discussion and analysis.

Introduction of plastic plasticizing screw

The solid plastic raw material enters the screw channel from the feeding funnel. Due to the high-speed rotation of the screw, the shearing effect occurs with the melt barrel, so that the plastic raw material is mixed and transported along the screw channel, so that the solid The plastic raw material is heated by the electric heating sheet on the outside of the melting barrel and the shear heat generated by the screw, so that the inside of the melting barrel is heated up and melted into a melt state.

The plasticizing screw can be divided into four zones according to its function:

1. Solid conveying area

This section is connected with the feeding funnel, the plastic solid particles are tightly compressed to form a solid bed, and under the shearing effect of the melt tube, the plastic temperature is gradually increased, and the plastic is transported forward.

2. Melting delay zone

This section is the area from the end point of the solid conveying area to the area before the melting pool is formed. The front screw channel accumulates, and the pressure formed at the end of this zone is high enough to deform the solid bed, and the accumulation in the front screw channel gradually forms a melting pool.

3. Solid melting zone

This section is the end of the melting delay zone until the plastic is completely melted. This zone can be divided into two parts to discuss, one is plasticization, and plasticization mainly comes from the shearing effect of the melt tube, and the other is the melt glue Transport, transport the melted glue to the melting pool.

4. Melt glue conveying area

When injection screw barrel for injection machine all the plastic is completely melted, it begins to enter this section and ends at the end of the plasticizing screw to maintain a uniform temperature of the melt and stabilize the flow of the molten plastic.