What are the differences between injection molding machines and plastic extruders

1、 From the perspective of forming process analysis:
1. Plastic extruder is a machine that extrudes molten plastic through a fixed shaped extrusion port under the action of a screw, and then cuts it open after being water-cooled and shaped under the action of a traction machine. It is mainly used for the continuous production of various products with the same cross-section, such as pipes, rods, profiles, etc. It can also be used for plastic modification granulation. Its plastic processing is called extrusion molding process.
2. An injection molding machine injects molten plastic into a mold and cools it down to produce the product. It has a wide range of uses, and depending on the plastic, it is also used in different places. This process is called injection molding process.
Analysis from processing materials
There are also differences in the processed materials between extruders and injection molding machines, as the viscosity of the materials is different. Injection molding requires that plastic raw materials can flow in the mold, and the flow channels are generally tortuous and narrow, thus requiring good fluidity of plastic raw materials.
3、 From the perspective of operational principles
1. An injection molding machine injects plastic particles into a closed mold cavity after melting them. After filling the mold cavity, the operation is suspended first, and the plastic is shaped into its shape through cooling. After opening the mold, the operation is resumed. Various plastic products such as plastic cups, plastic pots, etc
2. A plastic extruder is a continuous extrusion process that involves melting plastic particles through a mold, such as plastic pipes, plastic sheets, etc., and then cutting them off in the subsequent process. The two types of machines not only process different materials, but also have different structures for the screw.
Plastic extruders can be divided into twin screw extruders and single screw extruders. Next, let's take a look at the differences between the two types of extruders. Differences between twin screw extruders and single screw extruders:
Single screw machines and twin screw machines; One is a screw, and the other is two screws. They are all driven by a motor, and the power varies depending on the screw. The power of the 50 cone twin is about 20kW, and the power of the 65 cone twin is about 37kW. The output is related to the material and screw. The output of 50 cone pairs is about 100-150kg/h, and that of 65 cone pairs is about 200-280kg/h. The output of a single screw is only half.