The application of non-stop screen changer in the production process of recycled material granulator

As a professional screen changer manufacturer in Zhengzhou, Bart has many years of experience in R&D and production of screen changer filters (screen changers are also called screen changer filters); special screen changer equipment includes: plastic granulator automatic screen changer, extrusion Screen changer for ex-machine pelletizer, screen changer for waste plastic recycling and granulation, etc., are indispensable equipment in the current plastic recycling and granulation industry.

The screen changer is used in plastic recycling and granulation to filter impurities in the melt, providing a clean and impurity-free melt for the subsequent process, and ensuring the improvement of the quality of the finished product. The plastic recycling granulation screen changer provided by Zhengzhou Bart screen changer manufacturer is a double-column double-station screen changer, and the continuous screen changer is generally composed of the screen changer body and the filter screen. It consists of a porous plate, a plunger and a heater. Its structure is designed as a double-channel double-filter screen, and its function is to work with one screen when changing the screen, and replace the other screen, so as to achieve uninterrupted material flow and non-stop screen change; the plastic recycling granulation screen changer is designed with an exhaust system, its purpose Yes: it can fully remove the gas contained in the melt and the porous plate to be replaced, preventing the gas from forming in the final product and affecting the quality of the product; the plastic recycling granulation screen changer has a large filtering area, strong production capacity, and high output. At 30kg/h-2600kg/h, it can meet the needs of large-scale plastic granulation production lines; the plastic granulation screen changer adopts rigid seals to prolong the service life and other advantages.

The plastic melt flows through the filter screen on the plunger, and impurities gradually accumulate in the filter screen. The melt pressure rises with the accumulation of time, and the filter screen should be replaced in time when the load that the equipment can bear. When replacing the filter screen, first pull out the upper plunger until the filter screen is exposed to the body, and then replace the filter screen. After the upper plunger returns to its original position, replace the filter screen in the lower plunger in the same way to complete a screen replacement process. This type of non-stop screen changer has a simple structure and is suitable for extrusion production with relatively clean raw materials. However, because the waste plastics used to produce recycled materials are difficult to clean thoroughly, during the production of recycled materials, a large amount of melt impurities accumulate on the filter screen in a short period of time, the filtering performance of the filter screen decreases, and the pressure of the machine head increases. When the melt pressure exceeds the limit, it will squeeze through the screen. If this type of screen changer is used, the filter screen will be replaced frequently, and even cause downtime, which will seriously affect the production capacity and yield of the equipment. The backwash screen changer can be used. Its working principle: the plastic melt flows into the screen changer body through the backwash body, the impurities are filtered by the metal filter screen, the impurities on the filter screen gradually accumulate, and the melt pressure rises accordingly. When the melt pressure in front of the mesh reaches the set value, the backwash plunger moves downward under the advancement of the hydraulic cylinder, and a small part of the melt flows backwards. The impurities accumulated on the filter screen are taken out. When the melt backflow time reaches the preset time, the backwash plunger starts to move upward under the effect of the hydraulic cylinder, and a small part of the melt backflow will accumulate in the filter screen. The impurities are brought out, and the backflushing plunger returns to its original position after the backflow reaches the preset time. In this way, a process of actively cleaning the filter screen is completed, and the purpose of cleaning the filter screen is completed. The filter screen can be recycled to greatly extend the time between screen changes, and can be continuously produced for a long time. info@battemachinery.com.