Single-screw and partial twin-screw extruders are determined by their structure, plasticizing capacity, and whether to use porous plates according to actual conditions.

The plasticization of the material in the barrel is related to the heating and the rolling shear of the screw. Under the same conditions, the higher the heating temperature, the greater the shear strength and the better the plasticization.

It is better to fill the screw with 2/3 of the material. Because there are too few filling screws, there is no material at the bottom of the screw, and there is no material above the screw. The material has low shear strength and poor plasticization, which affects the product quality. On the contrary, if it is too much, it will cause the material to enclose the screw with poor exhaust. Even the material from the vent will affect the quality of the product.

Too good or insufficient plasticization will weaken the impact performance. Therefore, if the impact performance is unqualified, the correct measures must be taken in the adjustment of the process parameters based on the symptoms of the cross section of the inner wall of the product appearance.

Both will cause the inner wall to be rough. If the inner wall is shiny or rough, and the outer surface is discolored, the temperature is higher, especially the third and fourth sections of the barrel; if there are raw meal particles on the inner wall and the surface is dark, the temperature is lower. Therefore, if the small product is rough, it must be cut and judged clearly to avoid mis-breaking.

The product entering the sizing sleeve is easy to be blocked.

Available: 

A. Check whether the cooling water is blocked; 

What effect does the sizing sleeve have when it is not concentric with···

It is determined by the gap between the mold and the mandrel, the pulling speed and the extrusion speed (extrusion amount).

A. The recycled material contains decomposed material or other red crushed materials; 

B. The accumulated material falls and is brought out after the vacuum exhaust hole is blocked for a period of time; 

C. The mat···

A. If the temperature of the mold is too high or too low, the surface gloss will be dim; 

B. The inner surface of the mold is rough and the accuracy is too low; 

C. The extrusion speed is too fast and the···

A. The temperature of the mold or mandrel is too low; 

B. The extrusion speed is too fast, and the melt is not plasticized in the mold body; 

C. The mold structure design is unreasonable and the compression ra···

A. There are impurities in the raw materials; 

B. The processing temperature is too low, it is not plasticized or the temperature is too high, and it is caused by the gas after decomposition; 

C. The ingremoldnt st···

1. Reasons for the decomposition of the inner wall of the product and adjustment methods

A.If the product temperature is too high, reduce the temperature of each area of the fuselage and the mixing material; 

B.The screw oil temperature is too high, reduce the screw oil temperature; 

C.Too much feeding, vacuum feeding, reduce feeding speed, control feeding; 

D.Body string temperature, reduce the synchronization speed and look for machine repair; 

E.The synchronization speed is higher, and the synchronization speed should be redu···

The function of the filter plate: 

A. Establish the head pressure; 

B. Transform the screw head material from spiral flow to axial flow along the filter hole.

Prevent the material from being heated and agglomerate, causing the material at the screw feeding section to be unable to be transported forward in time, which is the so-called ‘’not eating material’’

The shear strength of the same material depends on the filling degree of the material in the screw groove. The size of the screw gap, the larger the diameter of the screw and the depth of the screw groove, the faster the screw speed, the greater the shearing effect.