Extruders are one of the types of plastic machinery. The extruder can be divided into right-angle heads and beveled heads according to the head flow direction and the angle of the screw centerline. The screw extruder relies on the pressure and shear force generated by the rotation of the screw, so that the material can be fully plasticized and evenly mixed, and molded through the mouth mold.
Plastic extruders can be basically classified as twin screw extruders, single screw extruders, and less common multi-screw extruders and screwless extruders.
II. Principle of jwell extruders
In JWELL extruder twin screw extruder, the material transfer is drag type. Frictional drag in the solid conveying section, and viscous drag in the melt conveying section. The frictional properties of solid materials and the viscosity of molten materials determine the conveying behavior. If some materials have poor friction performance and do not solve the feeding problem, it is difficult to feed the material into the single-screw extruder. Therefore, granular raw materials are suitable for feeding single-screw extruders.
In jwell extruder twin-screw extruders, especially meshing twin screw extruders, the material is conveyed to a certain extent by forward displacement. The degree of forward displacement depends on the proximity of the screw of one screw to the relative slot of the other screw.
The extrusion method of jwell extruder twin screw extruder generally refers to melting the plastic at a high temperature of about 200 degrees, and forming the required shape when the melted plastic passes through the mold. The function of a twin-screw extruder is to transform solid plastic into a uniform melt by heating, pressurizing, and shearing, and feeding the melt to the next process.
III. The difference between two types of extruders
Single-screw machines and twin-screw machines: one is one screw, the other is two screws. They are all driven by a motor. The power varies depending on the screw. The output of a single screw is only half.
Extruders can be divided into single-screw, twin-screw and multi-screw extruders according to the number of screws. Nowadays, single-screw extruders are the most widely used, and are suitable for extrusion processing of general materials.
Jwell extruder twin screw extruder has the characteristics of forced extrusion, high quality, wide adaptability, long life, small shear rate, not easy to decompose materials, good mixing and plasticizing performance, direct powder forming, temperature automatic control, vacuum exhaust and other devices. It is suitable for the production of pipes, plates, profiled materials and other products.
Jwell extruder twin-screw extruder has good feeding characteristics, is suitable for powder processing, and has better mixing, exhaust, reaction and self-cleaning functions than single-screw extruder. It is characterized by its superiority when processing plastics and blends with poor thermal stability.
Ⅳ. Advantages of jwell extruder twin screw extruder
Larger twin-screw extruders can reduce production costs, which have obvious advantages in large twin-screw plastic granulation units, film blowing units, pipe extrusion units, etc.
The modular production of jwell extruder twin screw extruder can adapt to the special requirements of different users, shorten the research and development cycle of new products, and strive for greater market share.
Jwell extruder twin screw extruder has adopted modern electronic and computer control technology to automatically control the process parameters of the whole extrusion process, such as melt pressure and temperature, body temperature of each section, etc.
Twin-screw extruder has the characteristics of energy saving, high output, low energy consumption and low manufacturing cost.
Ⅴ. How to clean jwell extruders
1. How to properly clean the screw
1) Choose the right heating device
Using fire or roasting to remove the plastic stuck to the screw is the most common and effective way for plastic processing units, but acetylene flames should never be used to clean the screw. The acetylene flame temperature can reach 3000°C. Cleaning the screw with an acetylene flame will not only destroy the metallic properties of the screw, but will also significantly affect the mechanical tolerance of the screw.
2) Choose the right cleaning agent
Whether to use commercialized cleaners depends on different manufacturers and production conditions; plastic processing enterprises can also use different resins to make screw cleaners according to their own production conditions, saving a lot of money.
3) Choose the right cleaning method
The first step in cleaning the screw is to turn off the feed insert, that is, close the discharge port at the bottom of the hopper; then reduce the screw speed to 15-25r/min and maintain this speed until the melt flow at the front end of the die stops flowing. The temperature of all heating zones of the barrel should be set to 200°C. As soon as the barrel reaches this temperature, start cleaning.
2. How to properly clean the barrel
1) When preparing to wash the barrel, the barrel temperature is also set to 200°C.
2) Screw the round steel brush to the drill rod and the electric drill into a cleaning tool, and then wrap the steel brush with copper wire mesh.
3) Before inserting the cleaning tool into the barrel, sprinkle some stearic acid into the barrel, or sprinkle stearic acid on the copper wire mesh of the cleaning tool.
4) When the copper wire enters the barrel, start the electric drill to rotate it, and at the same time artificially make it move back and forth until this front and rear movement becomes free of resistance.
5) After the copper wire mesh is removed from the barrel, use a cotton cloth to wipe it back and forth in the barrel to remove any cleaning resin or fatty acid residue; after several such back and forth wiping, the cleaning of the barrel is considered complete. Thoroughly cleaned screws and barrels are ready to be assembled for the next production.