Current location：Modernization and large-scale production are only about 40 years old. At present, in addition to some materials that require high pressure in the process of recycling plastic particles, or materials that are not suitable for screw extrusion (such as polytetrafluoroethylene plastic, etc.). Other materials are mainly screw extruder, and formed a series of production in various countries. In the 1930s, the first plunger injection molding machine with high mechanization level appeared.
In the 1940s, screw extruders began to be used in injection molding pre plasticizing devices. Until the appearance of reciprocating screw injection molding machine in 1956, recycling plastic particles made the plastic molding technology began to develop by leaps and bounds, which indicates that the plastic molding technology has developed to a new historical stage. Recycled plastic particle calender was developed on the basis of rubber calender and appeared in the middle of 19th century. In the 1970s, the wide, high precision, high productivity, high automation of Z, s type, as well as special diameter, multi roller plastic calendering molding machine, also marks the plastic calendering technology has reached the modern level.
In the 1970s, the whole plastic industry has entered a new development period. The technical level, varieties, specifications and output of plastic molding processing equipment have been rapidly developed and tend to be mature. At present, plastic molding processing equipment has developed into a complete category, standardization, serialization, highly automated products. It includes plastic raw material preparation equipment, plastic molding equipment, plastic secondary processing equipment, plastic recycling equipment and other equipment types.
