The plastics industry is an important industrial part of the national economy, and it is also a new and highly comprehensive industrial system. Plastic is composed of resin synthesis, auxiliary agent production, plastic product molding and application, plastic raw material equipment, plastic recycling, recycling and utilization and corresponding resin synthesis equipment, auxiliary agent production equipment, plastic preparation equipment, plastic molding equipment, plastic secondary processing An industrial system consisting of equipment, plastic auxiliary equipment, plastic recycling and reuse equipment, machine head and mold manufacturing.
Due to the rapid development of the plastic industry and the continuous expansion of the application fields of plastic products, plastic processing equipment has become an important part of the national machinery industry.
Plastic production and processing equipment was developed on the basis of rubber machinery and metal die-casting machines. As early as the 1850s, rubber machinery had reached a certain level. By the 1870s, injection molding technology and equipment appeared. By the 1930s, plastic manufacturing and processing such as injection molding and extrusion formed industrialized processing methods. The development of the plastics industry into a new historical period in the 1970s promoted the continuous improvement of the level of plastic production and processing machinery, regardless of technology, variety, specifications, and output. There has been a great development.
Plastic processing machinery can be divided into plastic preparation and processing equipment, plastic molding production and processing equipment, plastic secondary production and processing equipment, plastic auxiliary production and processing equipment, and waste plastic recycling and processing equipment according to its technological process.
Plastic production and processing preparations mainly include kneaders, closed plastic mills, open plastic mills, mixers, screening machines, tablet presses, pelletizers and other plastic molding processing equipment that are the focus of plastic processing equipment. Mainly include injection molding machine and its auxiliary equipment, extruder and its auxiliary equipment, hollow blow molding machine, calender molding equipment, rotational molding equipment, foam plastic molding equipment. Plastic secondary processing equipment includes thermoforming machines, composite equipment, plastic circular looms, flocking machines, film slitting machines, printing machines, bag making machines, pipe expanding machines, welding machines, etc.
In the molding process, injection molding occupies an important position, and its equipment is an injection molding machine. Compared with extrusion molding, injection molding is to periodically produce a single part, while the extruder is continuous molding, mainly producing continuous products such as tubes, plates, sheets, films, and wires.
The characteristics of injection molding are as follows: plastic parts with complex shapes, precise dimensions and smooth surface can be molded at one time; parts with metal inserts can be molded, so that they have good assembly performance and interchangeability, which is beneficial to the plastic parts Application, standardization, serialization, and injection molding molds can be quickly replaced in order to manufacture products that meet market needs. It is especially suitable for the molding of engineering plastics and special plastics to obtain products with special properties and special purposes. It has high automation, high productivity, high intelligence, and can realize “unmanned” management. Injection molding products are widely used in household appliances, automobiles, machinery, electronics, construction, health, agriculture and forestry, transportation, aerospace and other industries.