Twin and Single Screw Compounding Extruder Pelletizing Line- China Suppliers Factory Manufacturers

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.

The Underwater pelletizing machine cuts pellets on the plastic steel ejection surface without centrifugal action to eject them, but direct water pressure flows through the nozzle surface to drain.

• What is contained in the extrusion system of the Underwater pelletizing machine?

• What is the use of the Underwater pelletizing machine?

• What are the causes and solutions for the high melting of the Underwater pelletizing machine?

What is contained in the extrusion system of the Underwater pelletizing machine?

The extrusion system includes a snail, a cylinder, a funnel, a nozzle, and a nozzle. Through the extrusion system, the plastic is plasticized into a uniform melt and continuously extruded by the screw under the resulting pressure.

(1) Screw: It is the most important part of the Underwater pelletizing machine. It is directly related to the scope and productivity of the extruder. It consists of high-strength corrosion-resistant alloy steel.

(2) Cylinders: The cylinder is a metal cylinder that is generally made of alloy steel or composite steel tubes clad with alloy steel, heat resistant, high-pressure resistant, strong, wear-resistant, and corrosion-resistant. The cylinder and the screw are matched to each other to realize the crushing, grinding, melting, plasticization, suction, and compaction of the plastic as well as the continuous and uniform supply of the rubber material to the molding system. In general, the barrel length of an Underwater pelletizing machine is 15-30-fold its diameter, so that the plastic is completely heated and plasticized.

What is the use of the Underwater pelletizing machine?

Underwater pelletizing machines can be used for chemical fertilizers, white soot, inorganic salts, chlorinated isocyanic acid, bleaching powder, pesticides, oxides, etc. as well as for industrial recycling dust: such as cast iron dust, lead, zinc, aluminum dust, converter dust, filter dust, grinding dust, etc. The material is forced to be pressed and molded by mechanical pressure without adding a net, and the purity of the product is guaranteed. The process process process is short, energy consumption is low, and performance high. The dry powder is directly granulated without a subsequent drying process, which is more conducive to the connection and transformation of the existing production process. The granular strength is high and the increase in bulk density is more significant than in other granulation processes. The Underwater pelletizing machine is particularly suitable for occasions to increase the specific weight of the product collection. The operating flexibility is great, the range of applications is wide and the crushing force can be adjusted by hydraulic pressure.

What are the causes and solutions for the high melting of the Underwater pelletizing machine?

Causes analysis: high filter masks, low melting index of polypropylene powder and high feed volume, low temperature of each section of the Underwater pelletizing machine results in the material being incompletely melted, and a low opening rate of the template impede the extrusion of the nozzle head material, etc. The reasons may cause the melting pressure to be too high.

Solution: If the Underwater pelletizing machine produces products with a low melting index, a filter with a low mesh width should be used and the throttle opening should be enlarged to reduce backpressure; the filter should be replaced in time and the quality of different additives and polypropylene powder should be monitored. Contains medium ash. Reduce the feed load. Without compromising the quality of the extruded product, increase the temperature of each section of the cylinder to increase the temperature of the polypropylene melt and increase the flow capacity of the material. After the extruder has been stopped, increase the temperature of the head of the Underwater pelletizing machine and keep it at a constant temperature for a while and rinse and then thoroughly clean the template.

The underwater pelletizing machine have been used in many fields Nanjing JlEYA maintains close relationships with customers in underwater pelletizing machine industry, and is committed to strengthening production and operation, improving quality and safety.

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.

In terms of the principle of motion, there are different types of twin-screw extruderswith isotropic and anisotropic meshing and non-meshing types. So what are the types of twin-screw extruders? And what are the application areas? The following is a detailed introduction.

 

Here is the content list:

l Isotropic twin-screw extruder

l Anisotropic twin-screw extruder

l Non-Engaging Twin-Screw Extruders

l SHJ-20 twin-screw laboratory extruder

l Application areas

 

Isotropic twin-screw extruder

These extruders are available at low and high speeds, the former mainly for profile extrusion, while the latter is used for special polymer processing operations.

(1) Close-meshing extruder. Low-speed extruders have a closely meshed screw geometry, where the profile of one screw is closely matched to the profile of the other screw, i.e., a conjugate screw profile.

(2) Self-cleaning extruder. High-speed co-rotating extruders have a closely matched screw-prong profile. This screw can be designed to have a fairly small screw gap so that the screw has a closed self-cleaning effect, this twin-screw extruder is called a tight self-cleaning co-rotating twin-screw extruder.

 

Anisotropic twin-screw extruder

The tightly meshed anisotropic twin-screw extruder has a small gap between the two screw grooves (much smaller than that in a co-engaged twin-screw extruder) so that a positive conveying characteristic can be achieved.

 

Non-Engaging Twin-Screw Extruders

The center distance between the two screws of a non-engaging twin-screw extruder is greater than the sum of the radii of the two screws.

 

SHJ-20 twin-screw laboratory extruder

It is suitable for universities, colleges, and scientific research laboratories for process and formula development, etc. It has the features of beautiful appearance, compact structure, easy to use and maintain, and precise control of process conditions. Gearbox homemade torque level: T/A3≤8 national standard main parts, twin-screw extruder new structure design, and hardened gear teeth of high precision grinding, to ensure that the gearbox works efficiently for a long time. Screw self-made: Screw elements with tightly meshed design, block type, can be easily replaced to suit different materials. Barrel captive: The precision grade of the twin-screw extruder can reach T6， favorable to energy saving, and the block type design makes various combinations possible.

 

Application areas

The two main areas of application of twin-screw extruders are extrusion of thermosensitive materials such as PVC pipes and profiles and processing of special polymers such as blending, venting, chemical reactions, etc. Twin-screw extruders for profile extrusion have intermeshing screw ribs and grooves and operate at a low speed of about 10/min or less. Compared to single screws, twin-screw extruders have much better feeding and conveying performance, especially for those difficult to feed and easy to slip, such as fibrous, powdery, and greasy materials. The short and uniform material retention time, better mixing, and larger heat transfer area allow for good material temperature control, which is especially important for processing heat-sensitive materials.

 

If you want to buy a twin-screw extruder, you can consider our cost-effective products.

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, After 17 years of development, now we have 20,000 square meters workshop with annual sales over 300+ sets, export over 60 countries.

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.

The engineering plastic twin screw extruder consists of a transmission device, a feed device, a barrel, and a screw. The function of each component is similar to that of a single-screw extruder. The difference to the single screw extruder is that in the engineering plastic twin screw extruder two parallel snails are arranged in the "cross-section" of the material.

• What is the working principle of the engineering plastic twin screw extruder?

• How do you treat a engineering plastic twin screw extruder?

• Why is the cooling device particularly important when using engineering plastic twin screw extruders?

What is the working principle of the engineering plastic twin screw extruder?

From the point of view of the principle of movement, the engineering plastic twin screw extruder distinguishes between the straight and uneven, and non-foaming types.

1. Double screw extruder of technical plastic

This type of engineering plastic twin screw extruder has a low speed and a high speed. The former is mainly used for profile extraction, while the latter is used for special polymer processing operations.

(1) Tightly machined extruder. The slow-running extruder has a closely combining screw geometry, in which the spiral antenna shape of one snail closely matches the spiral antenna shape of the other snail, i.e. the conjugated snail shape.

(2) Self-cleaning extruder. The simultaneous high-speed extruder has a closely tuned spiral shape. This type of snail can be executed with a relatively small snail split so that the snail has a closed self-cleaning effect. This type of engineering plastic twin screw extruder is called a compact self-cleaning engineering plastic twin screw extruder.

The gap between the two screw edges of the closely combining, opposing engineering plastic twin screw extruder is very small (much smaller than the gap in the evenly rotating engineering plastic twin screw extruder) so those positive conveying properties can be achieved.

2. Non-reciprocating double screw extruder of technical plastic

The axis distance between the two snails of the non-foaming engineering plastic twin screw extruder is greater than the sum of the radii of the two snails.

How do you treat a engineering plastic twin screw extruder?

1. After using the engineering plastic twin screw extruder for 500 hours, iron chips or other impurities from the gears are in the gearbox. Therefore, the gears should be cleaned and the gear lubricant replaced.

2. The engineering plastic twin screw extruder should carry out a comprehensive inspection of the extruder after an operating period to check the density of all snails.

3. If the double screw extruder is suddenly switched off during production, the main drive, and the heating stops, if the power supply is restored, each section of the cylinder shall be reheated to the specified temperature and kept for a specified period, before you can start the extruder.

4. If the display and the display of the engineering plastic twin screw extruder are full, check if the contact of the thermocouple, etc. is good.

Why is the cooling device particularly important when using engineering plastic twin screw extruders?

After the molded plastic extrusion layer has left the engineering plastic twin screw extruder, it should be cooled and formed immediately, otherwise, it will deform under the influence of gravity. The cooling method normally uses water cooling and is divided into quick cooling and slow cooling according to the different water temperatures. Fast cooling is the direct cooling by cold water. Rapid cooling is advantageous for the design of the extruded plastic layer, but in the case of crystalline polymers, due to sudden heat cooling, it is easy to leave internal stresses in the extruded layer structure, which leads to cracks during use. Generally PVC The plastic layer is deterred. Slow cooling should reduce the inner tension of the product. Water with different temperatures is given in the cooling water tank to gradually reduce the temperature and shape of the product. The extrusion of PE and PP takes place under slow cooling, i.e. through hot water, hot water, and cold water, which is called three-stage cooling.

Nanjing JlEYA is the leading manufacturer extruder manufacturer specializing in twin screw extrude. If you want to get more information, just go and connect them.

The extrusion system of a single screw extruder includes a screw, a cylinder, a funnel, a head, and a nozzle. The plastic is plasticized by the extrusion system into a uniform melt and is continuous under the resulting pressure through the screw of the extruder head.

• What is the relevant information about single screw extruders?

• How to improve the product quality of the single screw extruder?

• What role does the heating and cooling system play in the single screw extruder?

What is the relevant information about single screw extruders?

Each product type in the production line for single screw extruders has its operating characteristics. Only if you know their operating characteristics can you fully measure the efficiency of the machine.

Slug extruder's one of the guys. Record the operating points of single screw extruders and use single screw extruders correctly and sensibly.

The use of a single screw extruder includes several connections such as machine setup, adjustment, test run, operation, maintenance, and repair. Its use has the common characteristics of general machines, mainly in the drive engine and in the speed reduction device.

The working system of the single screw extruder, however, is the extrusion system, which has unique characteristics. When using the single screw extruder, pay particular attention to its properties.

How to improve the product quality of the single screw extruder?

1. About the extrusion product quality of the single screw extruder:

Injection extruders must conform to the raw material formula and process, the product size must correspond to the extrusion equipment and the raw materials must be sufficiently mixed and plasticized to ensure stable extrusion pressure and product quality.

2. Improve extrusion efficiency:

It is related to the selection of the single screw extruder, the screw structure, and the material properties, which are relative and must be considered comprehensively. Simple method, you can choose a larger extruder, the nozzle is opened into a nozzle and several forms.

What role does the heating and cooling system play in the single screw extruder?

The heating and cooling system of the inlet extruder consists of a heating device and a cooling device. It is a necessary condition for the smooth running of the extrusion process. The heater and cooling system shall ensure that the polymer material is melted and plasticized and that the temperature conditions during the molding process meet the process requirement.

The cooling system is generally installed in the cylinder, in the screw, and the bottom of the funnel of the inlet extruder. The cylinder cooling may be water-cooled or air-cooled. In general, small and medium extruder air cooling is used; Large series single screw extruders usually use water cooling or a combination of both. The main use of sludge cooling is a central water cooling system, the purpose of which is to increase the rate of solidification of the material, to stabilize the volume of discharges, and, at the same time, to improve product quality. The cooling system at the bottom of the funnel serves mainly to enhance the conveying effect of solids and to prevent the material particles from sticking due to the increase in temperature, blocking the material opening and impairing the supply. In general, in the case of extruders with screw diameters over 90 mm and fast-running screw extruders, a cooling device shall be installed at the bottom of the funnel.

Nanjing JlEYA has worked for many years to meet every customers’ need for single screw extruder. Just connect them.

Twin-screw extruders have barrels with an extension range of 4 and 6D, allowing for precise process design to meet specific customer requirements. All barrels allow for precise temperature control. Cooling is achieved by cooling water injection and high-performance electric heating rods for direct and fast heating. The auxiliary equipment of the twin-screw extruder consists of a straightening device, a preheating device, and a cooling and heating device. The following is a detailed description of the auxiliary equipment.

 

Here is the content list:

l Straightening device

l Preheating device

l Cooling device

 

Straightening device

One of the most common types of plastic extrusion rejects is eccentricity, and bending of the wire core in various patterns is one of the most important causes of insulation eccentricity. In sheath extrusion, scratches on the sheath surface are also often caused by the bending of the cable core. Therefore, a variety of extrusion units in the straightening device is essential. The main types of straightening devices are roller type (divided into horizontal and vertical type); pulley type (divided into single pulley and pulley group); stranded pulley type, which plays a variety of roles such as dragging, straightening, and stabilizing tension; pressure pulley type (divided into horizontal and vertical type), etc.

 

Preheating device

Cable core preheating is necessary for both insulation extrusion and sheath extrusion. For the insulation layer, especially the thin layer of insulation, the existence of pores should not be allowed, the core can be completely removed from the surface of the water, oil, and dirt through high temperature preheating before extrusion. For the sheath extrusion, the main role is to dry the cable core, to prevent the role of moisture (or moisture around the bedding layer) to make the sheath in the possibility of porosity. Preheating can also prevent the plastic from being extruded due to sudden cooling and residual internal pressure. In the process of extruding plastic, preheating can eliminate the cold line into the high-temperature heat, in contact with the plastic at the mouth of the die to form a disparity in temperature, to avoid fluctuations in plastic temperature and lead to fluctuations in extrusion pressure, to stabilize the amount of extrusion and ensure the quality of extrusion. Extrusion unit is used in the electric heating core preheating device, requires sufficient capacity, and ensures rapid temperature rise, so that the core preheating and cable core drying efficiency. The preheating temperature is restricted by the speed of wire release, generally similar to the temperature of the head.

 

Cooling device

The formed plastic extrusion layer after leaving the head should be immediately cooled and shaped, otherwise, deformation will occur under the action of gravity. The way of cooling usually uses water cooling, and according to the water temperature is different, divided into rapid cooling and slow cooling. Rapid cooling is the direct cooling of cold water, rapid cooling of plastic extrusion layer sizing is beneficial, but for crystalline polymers, due to sudden heat cooling, easy to internal residual stress in the extrusion layer organization, resulting in the use of the process of cracking, general PVC plastic layer using rapid cooling. Slow cooling is to reduce the internal stress of the product, in the cooling water tank placed in sections of different temperatures of water, so that the product gradually cool down and set, PE, PP extrusion on the use of slow cooling, that is, after hot water, warm water, cold water three cooling.

 

If you are engaged in a twin-screw extruder-related industry, you can consider our cost-effective products.

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