Qingdao Trusty Plastic Machinery Co.,Ltd.

Sometimes there is no material at the feeding mouth of twin screw extruder

Release time:2022-10-21 09:00

Qingdao Trusty Plastic Machinery Co., Ltd., as an enterprise with many years of experience in the production of extruders and related equipment, provides a large number of plastic extruders and extruder production line equipment for our customers. Sometimes we receive feedback from customers that the feeding port of the twin-screw extruder sometimes fails to discharge, which seriously affects the quality of the products produced by the company.

First of all, the editor needs to explain in advance that modern twin-screw extruders generally adopt the mode of forced feeding and starvation extrusion, so under normal circumstances, the feeding port of this extruder will not fail to discharge. However, in the actual production process, there will still be unloading situations.

If the plastic twin-screw extruder does not discharge the material, there are generally three reasons:

1. The material particles used in production are large, which is easy to cause blanking blockage for the size of the  feeding port;

2. The temperature of the barrel at the blanking port is too high, and the materials at the blanking port appear adhesion;

3. The screw structure design of the extruder equipment is unreasonable, and the screw pitch is too small.

Finally, in order to solve this phenomenon, the editor recommends solving the problem from the following points:

1. The material is screened or re-crushed to remove coarser particles;

2. The eccentric feeding port shall be selected as much as possible, and this design is more conducive to blanking;

3. Reduce the temperature near the feeding port of the barrel and cool it. This method has been mentioned a long time ago. This is a commonly used auxiliary feeding method for some large-diameter single-screw extruders, and the effect is good;

4. The screw feeding section adopts large pitch and deep groove screw elements, which requires modification or replacement of the screw, and requires detailed technical communication with the equipment manufacturer before modification, otherwise unforeseen problems will occur.

If there is more demand, we welcome you to call for detailed inquiries or on-site inspections, and we will provide you with professional technical guidance and equipment procurement suggestions.