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PVC compounding extruder is divided into two types of hard and soft RPVC pipes, RPVC pipes are chemically resistant and insulating, mainly transporting various fluids and used as wire sleeves, etc. SPVC pipes are manufactured by extruding PVC resin with a large amount of plasticizer and a certain amount of stabilizer and other additives after granulation. The following is a detailed description of the equipment functions of the PVC compounding extruder.

 

Here is the content list:

• High Speed Mixer High-Speed Mixing

• Accurate matching of feeding device

• Water tank for pipe forming

• Traction machine frequency conversion speed control

• Automatic cutting

• Unloading the material from the turning frame

 

High Speed Mixer High-Speed Mixing

Raw material intermixture is to feature PVC stabilizer, softener, inhibitor, and different auxiliary materials to the high-speed mixer in proportion and sequence to the method.

Accurate matching of feeding device

The PVC compounding extruder part is equipped with a quantitative feeding device to match the extrusion volume with the feeding volume to ensure stable extrusion of products. Due to the characteristics of the conical screw, the feeding section has a larger diameter, and the heat transfer area and sheer speed of the material are larger, which is contributive to the plasticization of the fabric and also the little diameter of the screw within the metering section reduces the warmth transfer space and also the sheer speed of the soften so that the melt can be extruded at a lower temperature. When the screw rotates in the barrel, the PVC mixture is plasticized and pushed to the head to achieve compaction, melting, mixing, and homogenization and to achieve the purpose of exhaust and dehydration. The feeding device and screw drive device adopt frequency conversion to realize synchronous speed regulation.

PVC compounding extruder dies head part of the compacted, molten, blended, and homogenized PVC has subsequent materials through the screw to the die head extrusion die head is the key component of pipe forming.

Water tank for pipe forming

The vacuum shaping water tank of PVC compounding extruderis used for pipe shaping and cooling, the vacuum shaping water tank is equipped with vacuum system for shaping and cooling and water circulation system stainless steel box body circulating water spray cooling, the vacuum shaping water tank is equipped with front and rear moving device and left and right, high and low adjustment manual device.

Traction machine frequency conversion speed control

The traction machine is used to continuously and automatically lead the cooled and hardened pipe from the head with frequency control.

Automatic cutting

The cutting machine is controlled by the travel switch according to the required length and then automatically cut and delay the turning frame to implement the flow of production, the cutting machine with a fixed-length work switch signal as a command to complete the whole process of cutting in the cutting process and pipe running synchronization cutting process is completed by electric and pneumatic drive, the cutting machine is equipped with a dust suction device to suck out the cutting debris and recycling.

 

Unloading the material from the turning frame

The material turning action is controlled by the cylinder through the air circuit to achieve the material turning frame is equipped with a limit device when the cutting saw cut off the pipe after the pipe continues to transport after a delay, the cylinder into the work of turning action to achieve the purpose of unloading. After unloading, it will be automatically reset after a delay of several seconds to wait for the next cycle.

 

Nanjing JlEYA is the leading manufacturer extruder manufacturer specializing in twin screw extruder, mini twin screw extruder, plastic extruder and parallel twin screw extruder in China, which is widely used in compounding, modification, polymerization, devolatilization, reaction, recycling, etc. After 17 years development, now we have 20,000 square meters workshop with annual sales over 300+ sets, export over 60 countries.

JIEYA has the most experienced technical core team, with extensive experience in system integration of the development manufacturing, materials processing, application technology andother fields.

Nanjing JIEYA attend Chinaplas 2021 held in Shenzhen. We sincerely welcome your visiting.

Our booth no.: 7Q25

Time: April 13-16, 2021

Address: Shenzhen World Exhibition Center

Look forward to meet you at there.

The special refining effect and excellent performance of the single screw extruder have been proved in practice. Practice has proved that the reciprocating single-screw mixing extruder is a new type of plastic extrusion equipment. The emergence of single screw extruder provides a high-performance plastic processing equipment for the majority of users. Made a huge contribution to the development of the plastics industry.

• What is the function of the single screw extruder operation screen?

• What is the significance of the emergence of a single screw extruder?

• What are the application fields of single screw extruder?

What is the function of the single screw extruder operation screen?

The operating panel is installed above the single screw extruder and can be rotated within 60 degrees for easy operation. There is a power indicator and emergency stop button on the right side of the touch screen. In an emergency, press the emergency stop button to stop immediately, which is used to protect the safety of the operator and the single screw extruder. The data recording, parameter setting, operation control and other operations of the entire instrument are all completed in this operation screen.

What is the significance of the emergence of a single screw extruder?

In the process of polymer processing, in order to give the polymer certain processing characteristics or to give the product specific use performance, it is often necessary to blend different polymers or blend the polymer with various additives and pigments. The single-screw extruder has the characteristics of uniform shearing, high dispersion, high filling, and stretching of the melt. And it combines the advantages of single and twin screw extruders. The unique working principle, coupled with a complete set of threaded components and supporting equipment, makes it more widely used. On a single screw extruder, it can achieve mixing, Mixing, plasticizing, dispersing, shearing, stretching, degassing, and granulation make the interface area of the melt flow in the machine far larger than the general shear flow.

What are the application fields of single screw extruder?

The reciprocating single-screw mixing extruder is a new type of plastic mixing processing equipment, which is widely used in the filling, blending, modification, crosslinking, grafting, color masterbatch, functional masterbatch, and resistance of various plastics. Production of fuel masterbatch, conductive material, degradable masterbatch, reinforcement, toughening and other special plastic materials.

Blending different types of polymers to obtain brand new polymer alloys with specific uses.

Various mineral fillers are added to the polymer melt to make high-filling materials with excellent performance and low price.

Production of various glass fiber reinforced and flame retardant products, with the addition of glass fiber up to 50%.

It is suitable for the production of various cable sheathing materials, insulating materials, cross-linking materials, semiconductors, shielding materials, and conductive materials.

Production of thermoplastic elastomers and hot melt adhesives.

The single screw extruder is increasingly used in industrial production.Nanjing JlEYA has committed itself to offering the best-suited single screw extruders at a reasonable price, and all that is necessary to meet the needs of the customer.

The single screw extruder is mainly composed of 3 parts: extrusion system, transmission system, and heating and cooling system. The following is a detailed introduction to the basic structure of the single screw extruder.

 

Here is the content list:

• Extrusion system

• Transmission system

• Heating and cooling system

 

Extrusion system

The main role of the extrusion system of the single-screw extruder is to melt and plasticize the polymer material to form a uniform melt, to realize the transformation from the glassy state to the viscous flow state. And in this process to establish a certain pressure, by the screw continuous extrusion delivery to the head die. Thus, the extrusion system plays an important role in the molding quality and output of the extrusion process.

The extrusion system mainly includes the feeding device, screw, and barrel, which is the most critical part of the extruder, of which the screw is the heart of the extruder, the material through the rotation of the screw in order to move in the barrel and get pressurized and part of the heat.

 

Transmission system

The drive system of a single screw extruder is usually composed of a motor, reducer, and bearing, whose role is to drive the screw and supply the torque and torque required by the screw in the extrusion process. During the extrusion process, the screw speed is required to be stable and does not change with the change of screw load to ensure the uniform quality of the product. However, in different situations, the screw is required to be able to achieve variable speed in order to achieve a machine that can adapt to the requirements of extruding different materials or products of different shapes. In most extruders, the change of screw speed is achieved by adjusting the motor speed. The drive system of the single-screw extruder is also equipped with a good lubrication system and a device for rapid braking.

 

Heating and cooling system

The heating and cooling system of a single screw extruder consist of a heating device and cooling device, which are necessary for the extrusion process to be carried out smoothly. The heating and cooling devices must ensure that the polymer materials are melted and plasticized and the temperature conditions during the molding process meet the process requirements.

The cooling device is generally set up in the extruder barrel, screw and hopper bottom, and other parts. Barrel cooling can be water-cooled or air-cooled, air-cooled is generally used for small and medium-sized single-screw extruders; large single-screw extruders are mostly water-cooled or a combination of the two forms. The cooling device at the bottom of the hopper is mainly to strengthen the solid material conveying effect, to prevent the material particles from becoming sticky due to the heating, blocking the material mouth and thus affecting the feeding. Generally, for extruders with a screw diameter of 90mm or more and high-speed extruders, a cooling device must be installed at the bottom of the hopper.

 

Our company focuses on twin-screw extruders, micro twin-screw extruders, plastic extruders, parallel twin-screw extruders, and other kinds of research and development and manufacturing as the core of the isotropic rotary twin-screw compounding extruder. If you still want to know more, you can consult our company.

The single screw extruder is mainly used for extruding soft and hard polyvinyl chloride, polyethylene, and other thermoplastic. It can be a variety of plastic products such as bubble sheets, extruded pipes, press plates, ribbons, etc. process and can also be used for melting granulation. The plastic extruder is characterized by advanced design, high quality, good plasticization, and low energy consumption. It uses an evolutionary drive and is characterized by low noise development, stable operation, great durability, and long service life.

• What are the relevant parameters of a single screw extruder?

• What are the properties of a single screw extruder?

• For which materials can a single screw extruder be used?

What are the relevant parameters of a single screw extruder?

The relevant parameters of the insertion extruder are arranged from left to right: the first field is the plastic machine code as S; the second box is the extruder code as J; the third field is the code for the different construction firms of the extruder. The three bars are combined, the plastic extruder is SJ; the ventilated plastic extruder is SJP; the plastic foam extruder is SJF; the extruder with plastic input is SJW; the plastic shoe extruder is SJE; The cascade plastic extruder is SJJ; the double-screw extruder is SJS; the conical double-screw extruder is SJSF; the multi-screw extruder is SJD. The fourth box is for auxiliary machinery with the code name F; in the case of an extruder unit with the code name E. The fifth parameter refers to the snail diameter and the ratio of length to snail diameter. The sixth field refers to the product's pattern sequences, which in the order of letters A, B, C... is arranged and the sample number is not given in the first sample.

What are the properties of a single screw extruder?

(1) The material support of the inlet extruder is mainly based on friction, which limits the conveyance performance of the inlet extruder. The addition of powder, paste, fiberglass, and inorganic fillers is difficult.

(2) If the head pressure of the inlet extruder is high, the counter current increases, which reduces the productivity of the inlet extruder.

(3) Injected exhaust gas extruder material has a low surface regeneration effect in the suction zone, so the suction effect of the inlet extruder is poor.

(4) Injection extruder is used for certain processes, such as polymer dyeing, heat-resistant powder processing, etc. not suitable. The single screw extruder is a high-speed and high-yield extrusion based on a high level.

For which materials can a single screw extruder be used?

single screw extruder series, single screw extruders can be used for the processing of PP, PE, PS, ABS, PMMA, PVC, and other thermoplastic tubes, plates, plates, rods, profile materials, and plastic granulation products. For different raw materials and product specifications, the screw assumes different length-diameter ratios and compression ratios, and the flow assumes different structures. Choose the right cylinder, screw, and drive mechanism to meet the processing requirements of high-quality products.

The use of single screw extruders is becoming increasingly widespread. Nanjing JlEYA has been concentrating on single screw extruders for several years. They will make every effort to meet the needs of users.

The development and application of twin screw extruders are increasingly eye-catching. Many aspects of the performance of single and twin screw extruders that dominate the extrusion industry can no longer meet the requirements of blending, filling, reinforcement, toughening and other modifications.

• What is the structure of the twin screw extruder?

• How does the twin screw extruder prevent material degradation?

• What are the structural characteristics of the twin screw extruder?

What is the structure of the twin screw extruder?

The twin screw extruder, a unique modular screw block is designed on the screw shaft, which is broken three times within a pitch, called a mixing screw block. Corresponding to these gaps, there are three rows of mixing blocks arranged on the inner sleeve of the barrel. The pin and the screw reciprocate in the axial direction at the same time in the process of radial rotation. The twin screw extruder moves in the axial direction once every time it rotates. Due to this special movement mode and the effect of mixing and sorting screws and pins, the material is not only sheared between the mixing pins and the irregular trapezoidal mixing blocks. And it is transported back and forth. The countercurrent movement of the material adds a very useful axial mixing movement to the radial mixing. The melt is continuously cut, turned, kneaded and stretched, and the twin screw extruder regularly interrupts the simple Layered shear mixing.

How does the twin screw extruder prevent material degradation?

Due to the simultaneous mixing in the radial and axial directions of the twin screw extruder, the mixing effect is enhanced and the best dispersion mixing and distributed mixing are ensured, so the homogenization time is short. In addition, the mutual engagement of the mixing pin and the screw block also improves the self-cleaning ability of the barrel. The twin screw extruder can ensure stable working pressure through proper screw block combination, without uncontrollable pressure and temperature fluctuations, and prevent material degradation in the barrel.

What are the structural characteristics of the twin screw extruder?

1. The main machine barrel and screw are assembled by building blocks

The barrel of the twin screw extruder is composed of multiple sets of open and closed barrels. The split barrel can be opened quickly and conveniently for easy cleaning and maintenance; the screw is composed of various mixing sleeves on the mandrel Composed of screw block and conveying screw block. The barrel and screw can be flexibly formed into an ideal form according to different types of materials and different technological requirements.

2. Unique design of gear box and swing box

The twin screw extruder realizes the axial reciprocating movement of the screw while rotating. Every time the screw rotates, it reciprocates once, and the thread is interrupted three times, thus producing a strong mixing effect. The mixing effect is in the axial direction rather than the radial direction, and occurs between the thread and the pin. All materials in the screw channel are subjected to uniform shear stress, instead of a thin layer of material being sheared.

Great products begin with the best engineering staff, and Nanjing JlEYA is ready to assist you with your technical requirements for twin screw extruder.

PVC compounding extruder is divided into RPVC pipe and SPVC pipe, RPVC pipe is easy to cut, welding, bonding, heating can be bent and therefore very easy to install and use. SPVC pipe has excellent chemical stability excellent electrical insulation and good flexibility and colorability this pipe is often used to replace rubber pipe to transport liquid and corrosive media also used as cable casing and wire insulation pipe, etc. So how do choose raw materials and the operation of PVC compounding extruder? The following is a detailed introduction

 

Here is the content list:

• Raw material selection

• Safety operating procedures

 

Raw material selection

PVC compounding extruder in the production of hard pipe resin should be selected from the lower polymerization degree of SG-5 resin polymerization degree of the higher its physical and mechanical properties and heat resistance is better, but the resin liquidity is poor to bring some difficulties in processing, so generally choose viscosity of 1.7 ~ 1.8 × 10-3Pa-s SG-5 resin is appropriate. Hard pipe generally uses lead-based stabilizers whose thermal stability is good commonly used trisodium lead but its lubricity is poor usually and good lubricity of lead, barium soap type and use. Processing hard tube lubricant selection and use are very important to consider both internal lubrication to reduce intermolecular forces to reduce the viscosity of the melt are conducive to molding and to consider external lubrication to prevent the melt and hot metal adhesion to make the product surface shiny. Internal lubrication is generally used metal soap type external lubrication with low melting point wax. Filler mainly with calcium carbonate and barium barite powder calcium carbonate to make the pipe surface performance of good barium can improve the molding of the pipe easy to shape both can reduce costs but the amount of too much will affect the performance of the pipe pressure pipe and corrosion-resistant pipe is best not to add or add less filler.

 

Safety operating procedures

1. Personnel without induction test and operation training cannot operate the extruder independently. 

2. People who have poor eyesight and slow response can not be on duty to operate. 

3. Before starting the machine to do a good job of environmental health around the PVC compounding extruder equipment, equipment around the pile of items not related to production. 

4. Check the safety settings of the extruder before production for damage and test whether it can work effectively. Check whether the connection bolts are loose and whether the safety guards are firm. 

5. Check the lubrication parts, remove the dirt, and refill the lubricant. 

6. PVC compounding extruder barrel and die heating constant temperature time to ensure that the material temperature does not reach the process requirements when driving production. 

7. Before starting the screw drive motor to use the hand plate support V pulley, should be flexible rotation, no blocking phenomenon; then start the lubricating oil pump work 3min before starting the screw rotation at low speed. 

8. Screw airlift time should not exceed 2 ~ 3min. 

9. PVC compounding extruder barrel before adding material to check the barrel, hopper, there is no foreign matter; raw materials should be free of metal, sand, and other impurities to Prevent damage to the screw. 

10. The screw starts, the transmission parts work sound normal, the main motor current within the allowable rated value, before allowing the barrel to add material, adding material should first be a small amount of evenly added material. 

11. When adjusting the die gap or clearing the dirty material, the operator should wear gloves and not face the barrel and die to prevent the molten material from spraying out of the die and scalding the body. 

12. Extruder driving operation is not allowed to repair, and no one is allowed to do any work on the equipment at this time. 

13. In case of the following phenomena, should be an emergency stop. 

Bearing parts of the high temperature, lubricating oil (grease) out; motor odor, smoke, or shell temperature is too high; speed box lubricating oil temperature, smoke; transmission parts emit irregular abnormal sound; machine work produces violent vibration; screw suddenly stop rotating.

14. PVC compounding extruder equipment on the safety cover and the location of the safety alarm device is not allowed to change at will, not to mention artificially caused by the malfunction. 

15. Find that the equipment leakage, oil leakage phenomenon should be timely maintenance troubleshooting, no water, oil flow around the machine.

 

If you have questions about how to use the PVC composite extruder, you can contact us on the official website. We are happy to answer for you.

A twin screw extruder is composed of several parts such as a transmission device, feeding device, barrel, and screw, etc. The role of each part is similar to that of the single screw extruder. So what are the main differences between the twin screw extruder and single screw extruder? The following is the detailed introduction

 

Here is the content list:

l Cross sectional profile

l The way of material transfer

l The material flow velocity field

 

Cross sectional profile

The difference from the single screw extruder is that the twin screw extruder has two parallel screws in an "∞" shaped cross section. Twin screw extruders for profile extrusion are usually closely meshed and heterogeneously rotating, although a few also use co rotating twin screw extruders, which generally operate at relatively low screw speeds of about 10 r/min. High speed meshing co rotating twin screw extruders are used for blending, venting, or as continuous chemical reactors, with maximum screw speeds ranging from 300 600 r/min. Non engaging extruders are used for mixing, venting, and chemical reactions, and their conveyors are very different from those of engaging extruders, and are closer to those of single screw extruders, although they are fundamentally different.

 

The way of material transfer

In the single screw extruder, the solid conveying section is friction dragging and the melt conveying section is viscous dragging. The frictional properties of solid materials and the viscosity of molten materials determine the conveying behavior. If some materials have poor frictional properties, it is more difficult to transfer the material to the single screw extruder if the feeding problem is not solved. In twin screw extruders, especially meshing twin screw extruders, the material transfer is to some extent a positive displacement transfer, the degree of positive displacement depending on the proximity of the screw prongs of one screw to the relative screw grooves of the other screw. The screw geometry of a closely meshed anisotropic rotary extruder yields a high degree of positive displacement transport characteristics.

 

The material flow velocity field

The flow velocity distribution of the material in a single screw extruder has been described fairly well, whereas the flow velocity distribution of the material in a twin screw extruder is quite complex and difficult to describe. Many researchers have analyzed the velocity field of the material without considering the material flow in the engagement zone, but the results of these analyses are very different from the actual situation. This is because the mixing characteristics and overall behavior of a twin screw extruder depend mainly on the leakage flow that occurs in the engagement zone, yet the flow in the engagement zone is quite complex. The complex flow spectrum of the material in a twin screw extruder exhibits macroscopic advantages that cannot be matched by a single screw extruder, such as adequate mixing, good heat transfer, high melting capacity, good venting capacity, and good control of the material temperature.

 

If you want to know more, you can consult our company. Nanjing JlEYA is the leading manufacturer extruder manufacturer specializing in a twin screw extruder, mini twin screw extruder, plastic extruder, and parallel twin screw extruder in China, which is widely used in compounding, modification, polymerization, devolatilization, reaction, recycling, etc. After 17 years of development, now we have a 20,000 square meters workshop with annual sales of over 300+ sets, export over 60 countries.

 

JIEYA has the most experienced technical core team, with extensive experience in system integration of the development manufacturing, materials processing, application technology, and other fields.

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