Do you know the development history of plastic extruder?

Twenty years ago, the feeding of extruders was usually done manually and it was difficult to get many pellets of raw material from one place into the hopper of the extruder. However, with the introduction of automation in plastics processing, people can escape the heavy manual work and dusty environment. Work that was previously done manually is now done automatically by transport equipment, for example.

1, extruders can be divided into single-screw, twin-screw and multi-screw extruders according to the number of screws

At present, the single-screw extruder is more widely used, suitable for the general granular material extrusion processing. Twin-screw extruders have less frictional heat, uniform material shear, stable plasticisation, large screw conveying capacity, stable extrusion volume, long residence time in the barrel and uniform mixing. The conical twin-screw extruder is characterised by forced extrusion, wide adaptability, long life, low shear rate, difficult material decomposition, good mixing and plasticising properties, direct powder forming, automatic temperature control and vacuum exhaust. It is suitable for the production of pipes, plates, profiles and other products.

Single-screw extruders play an important role in both plastic pelletizing and forming machines. In recent years, single-screw extruders have made great progress. Currently, Germany produces a large pelletizing machine with a diameter of 700 mm and a capacity of 36 t/h. The development of the single-screw extruder mainly marks the further development of plastic extruders, of which the screw is a key component.

In recent years, many plastic extruder companies have carried out a lot of theoretical and experimental research on extruder screws, and to date there are nearly 100 types of screw, such as separating, shearing, barrier, diverting and corrugating types. From the point of view of single-screw development, although single-screw extruders have been relatively well developed in recent years, new screws and single-screw extruders with special features will emerge as polymer materials and plastic products continue to develop.

After many years of development, plastic extruders have been derived from the original single-screw extrusion on the original twin-screw, multi-screw, and even no-screw models. Plastic extruders can be combined with various plastic forming auxiliary machines to produce a wide variety of plastic products, such as pipes, films, sheets, support materials, monofilaments, flat wires, winding tapes, extrusion nets, plates, profiles, granulation, cable coating, etc., forming various plastic extrusion lines. Therefore, whether now or in the future, plastic extruder is one of the more widely used equipment in the plastics processing industry.

2, plastic extruder processing molding

Plastic product forming is an important production step in the whole production line. The raw material of polymer is prepared by mixing equipment, then it enters the barrel of the screw of the extruder through the loading machine for shearing, melting, plasticizing and other processing, then the raw material gets a certain pressure in the mould of the extruder and can be extruded from the mould. Different moulds are used for different shapes, sizes and raw materials.

After the mould has extruded the product, it must be shaped and cooled to get the product we want. For example, plastic pipes need to be vacuum formed using a vacuum shaping table to ensure the shape of the pipe and the wall thickness of the pipe; hence, different technical choices have to be made for different pipe extrusion machine for sale depending on the specific product.

Extruders from Jwell extrusion machinery are renowned for their quality and performance, making them the perfect choice for plastic production. Advanced technology and top-notch materials make these machines reliable and efficient.