How to clean the screw of extruder effectively?

There are many cleaning methods for extruders. The following are usually used: resin cleaning is made of resin, such as polyester resin or epoxy resin. This method is generally used in cleaning or extruding machine of new equipment for a period of time. Because some materials are glued on screw or screw drum, the extrusion speed of materials becomes slower, and the color difference of color change varieties is large, this method can be used.

After resin cleaning, the resin used for powder coatings to be produced is used to further clean the machine without reinforcing agent or curing resin. When the extrudate is considered clean, it can be put into production formally. If the color difference of powder coatings is small and the cleaning time is not too long, only resin cleaning machine will be used to produce powder coatings. In order to increase the friction of resin and benefit the cleaning machine, some fillers can be added to the cleaning machine.

The non-resin cleaning method uses materials such as paddy, corn, sawdust and toilet paper which have certain friction and are easy to crush. When the extruder is heated to the normal extrusion temperature, the friction between these materials and screw and screw barrel is used to remove powder coating colloids adhering to the surface of screw and screw barrel. Experience shows that rice husk has high hardness and great friction, compared with the effect of cleaning machine is ideal. After cleaning with this method, it is necessary to open the screw drum again to check the cleaning situation. Normally, it is necessary to clean the machine with resin for powder coatings according to the above method before the production of formal products can be carried out.

In plastic machinery, in the equipment of plastic foam extruder, the plastic extruder is usually called the main machine, while the plastic extruder is called the auxiliary machine. After more than 100 years of development, plastic extruder has been derived from the original single screw twin screw, multi-screw, even no screw and other models. Plastic extruder can match various plastic forming auxiliary machines such as pipe, film, holding material, single wire, flat wire, packing belt, extrusion net, plate, profiled material, granulation, cable coating, etc. to form various plastic extrusion forming production lines and produce various plastic products. Therefore, plastic extrusion moulding machinery is one of the widely used machines in plastic processing industry or has become the application of machinery.

For extruders used in manufacturing thermosetting powder coatings, it is necessary to clean the extruders in order to prevent interference between the varieties of powder coatings and ensure the quality of the products produced when changing the varieties of paint resins or colors. When the extruder is not cleaned thoroughly, the most obvious effect is on the color of powder coatings, which can be directly observed; in addition, the production of fine powder coatings without leveling agent in front of the extruder, when the high-gloss powder coatings are reproduced without cleaning the extruder, due to the interference of the front materials, the film capacity of the products produced later is made. It is easy to produce shrinkage and other disadvantages. Therefore, thorough cleaning is very important when changing the varieties of paint resins and colors.