Twin Screw Extruder

▏Product Vedio

▏Basic definition

Plastic twin-screw extruder is an efficient and high-quality plastic processing equipment, which relies on two meshing screws to achieve the transportation, mixing, plasticizing and extrusion of plastic raw materials. The equipment is widely used in the plastic processing industry and is one of the important equipment for the production of various plastic products.

▏Structure composition

Plastic twin screw extruder is mainly composed of transmission device, feeding device, barrel, twin screw, heating and cooling system, control system and extrusion mold.

Transmission device: including motor, reducer and drive shaft, responsible for driving the twin screw rotation.

Feeding device: composed of hopper and feeder, responsible for feeding plastic raw materials into the barrel.

Barrel: Provides room for twin-screw rotation and is usually designed to be split for easy screw replacement and cleaning.

Twin screw: composed of two screws meshing each other, responsible for the conveying, mixing and plasticizing of materials.

Heating and cooling system: used to adjust the temperature of the barrel and the twin screw to ensure uniform heating and cooling of plastic raw materials.

Control system: including electric cabinet and control panel, responsible for equipment operation monitoring and fault alarm.

Extrusion mold: According to the product shape and size requirements, the molten plastic extrusion molding.

▏How it works

The working principle of the plastic twin screw extruder is to rotate the plastic raw materials from the feeding port into the barrel through the rotation of the twin screw. In the barrel, the rotation of the twin screw produces shear and friction, so that the plastic raw materials gradually soften, melt and mix evenly. At the same time, the heating and cooling system regulates the temperature of the barrel and the twin screw to ensure the appropriate plasticizing temperature of the plastic raw materials. Finally, the molten plastic is extruded through an extrusion mold pushed by a twin screw.

▏Main types

According to the rotation direction of the screw, the degree of engagement and the structural characteristics, the plastic twin screw extruder can be divided into a variety of types, such as the meshing type, the opposite meshing type and the non-meshing type.

Simultaneous meshing type: the twin screw rotates in the same direction, which is suitable for strong mixing and dispersing of materials.

Opposite engagement type: the twin screw rotates in the opposite direction, which is suitable for the processing process with low shear force requirements for the material.

Non-meshing type: the center distance between the twin screws is greater than the sum of the screw radius, suitable for the shear force is not high, the need for gentle processing of materials.

▏Performance characteristics

Plastic twin screw extruder has the following performance characteristics:

Easy feeding: can directly add ribbon material, powder, etc., high conveying efficiency.

Good mixing effect: the mutual meshing of the twin screws makes the material subject to complex shear, tensile and extrusion between the screws, and the mixing is sufficient and the heat transfer is good.

Excellent exhaust performance: the effective mixing of the mesh part of the twin screw and the self-cleaning function of the exhaust part, so that the material can get a complete surface renewal in the exhaust section.

Strong plasticizing ability: Under the combined action of the rotation of the screw and the heating and cooling system, the plastic raw materials can be quickly softened, melted and plasticized.

High output: The output of twin-screw extruder mainly depends on the feeding amount, the screw characteristic line is hard, and the output is not sensitive to pressure.

▏Application field

Plastic twin-screw extruder is widely used in the plastic processing industry, such as the production of plastic products such as pipe, profile, plate, film, wire and cable sheath, as well as plastic composite materials, plastic recycling and other fields.

▏Innovation and technology

With the continuous development of science and technology, plastic twin-screw extruders have made remarkable progress in technological innovation. For example, the use of advanced screw design, improve the mixing effect and plasticizing ability of materials; The precise heating and cooling system is adopted to realize the precise control of the temperature of the barrel and the twin screw. The intelligent control system is used to realize the automatic operation and fault alarm of the equipment.

▏Advantage analysis

Compared with single screw extruders, plastic twin screw extruders have the following advantages:

Good mixing effect: the mutual meshing of the twin screws makes the material subject to stronger shearing and mixing between the screws, and the mixing effect is better.

Strong plasticizing ability: The combination of the rotation of the twin screw and the heating and cooling system enables plastic raw materials to be plasticized more quickly and evenly.

High yield: The twin screw extruder has a higher yield and is suitable for mass production.

Adaptable: able to handle many types of plastic raw materials, including high viscosity, high filling or high reactive plastic raw materials.