Manufacturers supply screw original plastic granulator twin-screw extruder machine spare parts
Product Description
The function and working principle of plastic extruder:
A plastic extruder is a device that heats and extrudes plastic raw materials.
It is mainly composed of screw, barrel, head, transmission system and other parts, its working principle is to push forward the plastic through the rotation of the screw, and at a certain pressure and temperature, the plastic is extruded into various shapes of products, such as pipes, plates, profiles and so on.
Plastic extruder (host) can be matched with pipe, film, holding material, monofilament, flat wire, packing belt, extrusion mesh, plate (sheet) material, profile, granulation, cable coating and other plastic molding auxiliary machines to form a variety of plastic extrusion molding production line to produce a variety of plastic products.
The working principle of the plastic extruder mainly includes the following steps:
1. Feeding: Add plastic raw materials to the hopper.
2. Conveying and compression: the screw rotates in the barrel, transporting the raw materials forward and gradually compacting.
3. Heating and plasticizing: the heater outside the barrel heats the raw material, and the shearing and mixing of the screw plasticizes the raw material into a molten state.
4 Extrusion molding: Under the push of the screw, the molten plastic is extruded through the head to form the required product shape.
5. Cooling and shaping: The extruded products are cooled and shaped by the cooling device and finally processed.
Forming principle of plastic extruder:
The extrusion method of plastic extruder generally refers to the melting of plastic at a high temperature of about 200 degrees, and the melted plastic forms the required shape when passing through the mold. Extrusion molding requires a deep understanding of plastic characteristics and rich experience in mold design, and is a molding method with high technical requirements.
Extrusion molding is the method of making the material flow through the mouth mold continuously by heating and pressurizing in the extruder, also known as "extrusion". Compared with other molding methods, it has the advantages of high efficiency and low unit cost.
The extrusion method is mainly used for the molding of thermoplastics and can also be used for some thermosetting plastics. Extruded products are continuous profiles, such as tubes, rods, wires, plates, films, wire and cable cladding. In addition, it can also be used for plastic mixing, plasticizing granulation, coloring, blending and so on.
Extruded products can be called "profiles", because the cross-section shape is mostly irregular, so it is also called "profile"
Plastic extruder (host) can be matched with pipe, film, holding material, monofilament, flat wire, packing belt, extrusion mesh, plate (sheet) material, profile, granulation, cable coating and other plastic molding auxiliary machines to form a variety of plastic extrusion molding production line to produce a variety of plastic products.
The difference between twin screw extruder and single screw extruder is mainly reflected in the following two aspects:
How materials are transported:
In a single screw extruder, friction drag is used in the solid conveying section and viscous drag is used in the melt conveying section. The frictional properties of solid materials and the viscosity of molten materials determine the conveying behavior. If some materials have poor friction performance, if the feeding problem is not solved, it is more difficult to feed the material into the single screw extruder. In twin-screw extruders, especially meshing twin-screw extruders, the transfer of materials is to some extent a positive displacement transfer, and the degree of positive displacement depends on the proximity of the screw edge of one screw to the relative screw groove of another screw. The geometry of the screw of the tightly engaged cross-rotating extruder can obtain high forward displacement transport characteristics.
Flow velocity field of material:
At present, the flow velocity distribution of the material in a single screw extruder has been described quite clearly, but the flow velocity distribution of the material in a twin screw extruder is quite complicated and difficult to describe. Many researchers just do not consider the material flow in the meshing zone to analyze the material flow velocity field, but these analysis results are very different from the actual situation. Because the mixing characteristics and the overall behavior of the twin-screw extruder mainly depend on the leakage flow in the meshing zone, the flow situation in the meshing zone is quite complex. The complex flow spectrum of the material in the twin screw extruder shows the advantages that the single screw extruder can not compete in the macro, such as sufficient mixing, good heat transfer, large melting capacity, strong exhaust capacity and good temperature control of the material.
Plastic extruder properties specification:
| Model No: |
S65 |
Assembly Structure: |
Integral Type Extruder |
| Product Type: |
Molding Molding Machine |
Plastic Processed: |
PVC PP PE PPR Pipe |
| Origin: |
Dongguan Province, China |
Trademark: |
Shengsai |
| Transport Package: |
Film and wood package |
Specification: |
201*90*122cm |
FAQ
Q1: Are you a trading company or a manufacturer?
A1: We are a manufacturer, we provide factory prices, good quality, welcome to visit!
Q2: What are your quality guarantees if we buy your machines?
A2: We provide you with high quality machines with a one-year warranty and lifetime technical support.
Q3: When can I get my machine after payment?
A3: Usually production time is around 20-30 days, depending on the type of machine you order. Transit time is based on
At your port of destination.
Q4: What about spare parts?
A4: We will ship a year's worth of vulnerable spare parts with the machine. During the warranty period, we will provide spare parts at a cost including shipping.
The transmission system of the plastic extruder is usually driven by a motor, and the main working process is as follows:
1. Motor operation: The motor is connected with the screw of the extruder through a coupling.
2. Power transmission: the motor drives the screw to rotate, and the screw rotates in the barrel.
3. Speed control: The motor speed can be adjusted through the inverter and other devices, so as to achieve accurate control of the screw speed to adapt to different production needs.
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