Introduction to Categories and Forming Principles of Plastic Extruders

Categories of plastic extruder

Plastic extruder can be divided into single-screw extrusion machines, twin-screw extrusion machines, and multi-screw extrusion machines based on the number of screws. Single-screw extrusion machines are the most widely used and suitable for the extrusion processing of general materials. Twin-screw extrusion machines generate less heat from friction, result in more uniform material shearing, have larger conveying capacity, stable extrusion output, and mix the material thoroughly due to longer residence time in the barrel. 

Single-screw extrusion machines have an important place as plasticizing granulation machinery and molding processing machinery. In recent years, single-screw extrusion machines have made great progress.

Twin-screw extrusion machines have good feeding characteristics, suitable for powder processing, and have better mixing, exhaust, reaction, and self-cleaning functions than single-screw extrusion machines. Their advantage shows when processing plastics and blended materials with poor thermal stability. Multi-screw extrusion machines are developed based on twin-screw extrusion machines to make it easier to process blended materials with poor thermal stability. As a top plastic extruder supplier, jwell exruder provides all types of extrusion machines.

• Based on the number of screws, they are divided into single-screw extrusion machines, twin-screw extrusion machines, and multi-screw extrusion machines;
  

• Based on whether the extruder machine has a screw, they are divided into screw-type extrusion machines and plunger-type extrusion machines;

• Based on the screw's speed, they are classified as ordinary extrusion machines with speeds<100r/min, high-speed extrusion machines with speeds of 100-300r/min, and ultra-high-speed extrusion machines with speeds of 300-l500r/min;

• Based on the assembly structure of extrusion machines, there are integral extrusion machines and separated extrusion machines;

• Based on the screw's spatial position in the machine, they are divided into horizontal extrusion machines and vertical plastic extruder;

• Based on whether the machine vents during the processing, they are divided into vented extrusion machines and non-vented extrusion machines.

Principles of plastic extruder molding

The extrusion method of plastic extrusion equipment for sale generally refers to melting the plastic at around 200℃, and then forming the required shape through the mold. Extrusion molding requires a deep understanding of the plastic's properties and rich experience in mold design, making it a molding method with high technical requirements.

Extrusion molding is a method in which the material is continuously molded through the die in a flowing state by heating and pressurizing the material in the extrusion machine. It is also called "extrusion molding." Compared with other molding methods, it has the advantages of high efficiency and low unit cost.

The extrusion method is mainly used for the molding of thermoplastic materials and can also be used for some thermosetting plastics. The products extruded are all continuous profiles, such as pipes, rods, wires, plates, films, wire and cable covering layers, etc. In addition, it can also be used for plastic blending, plasticizing granulation, coloring, and blending. The extruded products can be called "profiles," and because most of the cross-sectional shapes are irregular, they are also called "non-standard profiles."