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

Update:04 Apr 2019
Summary:

1.solid transport area This section is joined to the fe […]

1.solid transport area

This section is joined to the feed funnel, and the plastic solid particles are tightly compressed to form a solid which is subjected to the shearing effect of the melt cylinder, except that the plastic temperature is gradually increased, and the plastic is transported forward.

2. Melting delay zone

 This section is the end point of the solid transport zone to the former zone of the melt pool. The main feature is that a thin film layer composed of melt rubber is formed on the surface of the solid bed and the melt cylinder, and the melt adhesive in the film layer is subjected to the adhesive force of the melt cylinder. The front screw groove accumulates, and the pressure formed at the end of this zone is large enough to deform the solid bed, and the molten pool is gradually formed in the front screw groove.

 3. Solid solution 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. One is plasticization, and the plasticization mainly comes from the shearing effect of the melt cylinder, and the other is the melt. Conveying, conveying the melt to the melting tank.

4. the melt transfer area

When all the plastics have completely melted, they begin to enter this section and end at the end of the plasticizing screw, maintaining a uniform temperature of the melt and stabilizing the flow of molten plastic.