Plastic molding processing equipment is developed on the basis of rubber machinery and du metal die casting machine. Since the emergence of polymer dao injection molding technology and simple molding equipment in the 1870s, as an industry, it has not achieved rapid development until the 1930s. Plastic molding processing equipment has gradually become commercialized. Injection molding and extrusion molding have become Industrialized processing methods. Blow molding is the third largest plastic molding method after injection and extrusion, and it is also the fastest growing plastic molding method.
Plastic molding machine classification:
1. Plastic injection molding machine
Plastic injection molding is a method of injection and molding. Its equipment is called plastic injection molding machine, or injection molding machine for short. Plastic injection molding machine is the main molding equipment that makes thermoplastic and thermosetting plastics into various plastic products. Ordinary plastic injection molding machinePVDF White Swing Non-Return Check Valve refers to the most widely used horizontal, vertical or angular single-station injection molding machine for processing thermoplastic single screw or plunger.
Other types of injection molding machines, such as thermosetting plastics, structural foaming, multi-component, reactive, vented, etc. injection molding machines, refer to those that are quite different from ordinary plastic injection molding machines in terms of materials to be processed and structural features of the machine. Injection molding machine. About 30% of the plastic raw materials in the world are used for injection molding, and injection molding machines account for about 40% of the total output of plastic machinery, and have become an important part of the plastic processing industry and plastic machinery industry, and are the growth of plastic machinery products. One of the fastest models with the most variety and specifications and the largest production quantity.
2. Plastic extruder
In the plastic extrusion molding equipment, the plastic extruder is usually called the main machine, and the subsequent equipment that is matched with the plastic extrusion molding machine is called the auxiliary machine. After more than 100 years of development, the plastic extruder has been derived from the original single-screw, multi-screw, and even non-screw models. The plastic extruder (host) can be used with various plastic molding auxiliary machines such as pipe, film, holding material, monofilament, flat wire, strapping, extruding net, board (sheet) material, profiled material, pelletizing, cable coating, etc. Matching to form various plastic extrusion molding production lines to produce various plastic products. Therefore, plastic extrusion molding machinery is one of the widely used models in the plastic processing industry.
3. Plastic blow molding machine
Blow molding consists of two basic steps: firstly, the parison is formed, and then compressed air (and stretch rod) is used to radially inflate (and axially stretch) the parison to make it close (stretch) blow molding The mold cavity gives the shape and size of the cavity to the product and cools it.
4. Multi-layer blow molding
There are two types of molding: co-extrusion blow molding and co-injection blow molding; stretch blow molding includes injection stretch blow molding and extrusion stretch blow molding. Stretch blow molding can be divided into one-step method and two-step method.
5. Press and transfer molding machine
Compression molding and transfer molding are the main molding methods for thermoset plastics. The press used for compression molding and the transfer molding machine for transfer molding are the main molding equipment for making various plastic products from thermoset plastics. The function of the press is to apply pressure to the plastic through the plastic mold. If a fixed mold is used, it can also open and close the mold and eject the product. The presses used for compression molding are divided into two categories: motorized presses and hydraulic presses. Since the manufacture, operation and repair of motorized presses are more complicated than hydraulic presses, and they are not suitable for compression molding large plastic parts, they are gradually eliminated. The presses used are basically hydraulic presses. The pressure medium of hydraulic press usually includes oil and water. The former is widely used in small and medium-sized equipment. The transfer molding equipment can use the same hydraulic press as the compression molding, or a dedicated transfer molding machine. The transfer molding machine is actually a double-pressure hydraulic press with two hydraulic cylinders. According to its structure, it can be divided into up and down double pressure type and right angle type.
6. Thermoforming machine
There are only three types of plastic thermoforming methods for thermoforming machines, namely, female molding, male molding and pair-molding. The thermoforming machine should be able to repeat the thermoforming production cycle according to a certain procedure to produce exactly the same product. There are many types of thermoforming machines, including manual, semi-automatic and automated thermoforming machines. The volume of thermoformed products is large and the quantity is small, so semi-automatic or manual thermoforming machines are suitable. On the contrary, if the product is small in size and large in quantity, it is more appropriate to choose an automated thermoforming machine.
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