2000KG/H Underwater Pelletizing System- Suppliers Factory Manufacturers From China

 

In plastic extrusion molding equipment, the plastic extruder is usually called the main machine, while its subsequent equipment plastic extrusion molding machine is called the auxiliary machine. Plastic extruders can produce a variety of plastic products. Therefore, the plastic extrusion molding machine is one of the widely used machines in the plastics processing industry, both now and in the future. So what are the characteristics of plastic extruders? The following is a detailed introduction.

 

Here is the content list:

• Modularity and specialization

• High efficiency and multi-functionalization

• Enlargement and precision

• Intelligent and networked

 

Modularity and specialization

The modular production of plastic extruders can adapt to the special requirements of different users, shorten the research and development cycle of new products, and strive for a larger market share; while specialized production can arrange the production of each system module component of extrusion molding equipment at a fixed point or even for global procurement, which is very beneficial to ensure the quality of the whole period, reduce costs and accelerate the capital turnover.

 

High efficiency and multi-functionalization

The high efficiency of plastic extruders is mainly reflected in the high output, low energy consumption, and low manufacturing cost. In terms of function, the screw plastic extruder has been used not only for extrusion molding and mixing processing of polymer materials but its use has been broadened to food, feed, electrode, explosives, building materials, packaging, pulp, ceramics, and other fields.

 

Enlargement and precision

Achieving the large-scale plastic extruder can reduce the production cost, which is a more obvious advantage in the large twin-screw plastic pelletizing set, film blowing set, pipe extrusion set, etc. National key construction services required for major technical equipment, large-scale ethylene project supporting one of the three key equipment of large extrusion pelletizing unit long-term dependence on imports, so we must accelerate the localization process to meet the development needs of the petrochemical industry.

 

Intelligent and networked

Plastic extruders in developed countries have generally used modern electronic and computer control technology, the entire extrusion process parameters such as melt pressure and temperature, the temperature of each section of the body, the main screw and feeding screw speed, feeding volume, the ratio of various raw materials, motor current and voltage and other parameters for online detection, and the use of microcomputer closed-loop control. This is extremely beneficial to ensure the stability of process conditions and improve the precision of products.

 

If you need to buy a plastic 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, 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.

 

The composition of the single screw extruder: mainly consists of servo motor, reduction box, screw cylinder, nozzle head, filter air, heating and cooling system, touch screen, and SPS control. It is the extrusion host to form.

• What are the reasons why the main engine of the single screw extruder cannot be started and the solutions?

• What are the reasons and solutions for the high inlet flow of the single screw extruder?

• What is the design concept of the single screw extruder?

What are the reasons why the main engine of the single screw extruder cannot be started and the solutions?

1. Reasons:

(1) The driving program of the single screw extruder is wrong.

(2) There is a problem with the main engine thread and whether the fuse is blown.

(3) The locking device for the single screw extruder and the main engine works.

2. Treatment:

(1) Check the program of the insert extruder and restart in the correct order.

(2) Check the main engine circuit.

(3) Check whether the lubricating oil pump has started and check the status of the locking device concerning the main engine. The oil pump cannot be turned on and the engine cannot be turned on.

(4) The inverter has not discharged the induction current, turn off the main power supply and wait five minutes before starting.

(5) Check if the emergency button of the single screw extruder has been reset.

What are the reasons and solutions for the high inlet flow of the single screw extruder?

1. Reasons: (1) The single screw extruder has an insufficient heating time and a large torque. (2) A certain section of the heating does not work.

2. Treatment method: (1) Use the handwheel when driving the single screw extruder. If it is not easy, extend the heating time or check that the heaters of the individual sections work properly.

The main engine makes an abnormal noise:

1. Reasons: (1) Main engine stock damaged. (2) A specific SCR in the SCR DC power supply of the main engine is damaged.

2. Treatment method: (1) Replace the main engine stock of the single screw extruder. (2) Check the thyristor alignment and replace the thyristor component if necessary.

What is the design concept of the single screw extruder?

1. High-speed and high-Yield extrusion based on high quality.

2. The design concept of low-temperature plasticization ensures the extrusion of high-quality products.

3. The two-stage overall design of the single screw extruder reinforces the plasticization function to ensure the adjustment of the high-performance extrusion.

4. Special barrier, comprehensive mixing design to ensure the mixing effect of materials.

5. High torque drop, extra-large pressure bearing.

6. Gears and shafts are made of high-strength alloy steel, cooled, and chipped.

7. High hardness, high finish, extremely quiet.

8. PLC-intelligent control can realize the connection between main and auxiliary machines.

9. The easy-to-monitor human-machine interface makes it easy to understand the processing and machine status.

10. The control method (temperature device) can be changed if necessary.

11. The material is 38CrMoAL/A nitric treatment, wear-resistant.

12 Strict temperature control accuracy, combined with air cooling and water cooling.

13. The single screw extruder has a unique inlet design and complete water cooling.

14. An single screw extruder with a grooved surface of the lower shell has an improved feed function that guarantees a high speed and a high yield of extrusion.

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.

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.

With the development of modern industry, the underwater pelletizing machine has become an important production equipment used in all aspects of production.

• What is the working principle of the underwater pelletizing machine?

• What is the operating procedure of the underwater pelletizing machine?

• What are the reasons why people choose underwater pelletizing machine?

What is the working principle of the underwater pelletizing machine?

The material using the underwater pelletizing machine will pass through the feeding port, and under the action of the rotating screw, it will be rolled into a dough and roll forward along the screw groove. Due to the shear, compression and agitation of the screw, the material will be further mixed and plasticized. , The temperature and pressure gradually increase, showing a state of viscous flow, and passing through the machine head with a certain pressure and temperature, and finally a product of the desired shape is obtained.

What is the operating procedure of the underwater pelletizing machine?

(1) Check the rotation direction of the impeller of the underwater pelletizing machine. From the feed inlet, the impeller should turn counterclockwise, otherwise the motor connection should be adjusted.

(2) The starting sequence of the underwater pelletizing machine and the material conveying equipment is as follows:

Discharge belt conveyor→PL vertical impact crusher→feeding belt conveyor

The crusher must be started without load, and the material can only be fed after the crusher is running normally.

(3) The feed size is strictly in accordance with the feed size specified by the various models. It is forbidden to enter the underwater pelletizing machine with the size of the material larger than the specified size, otherwise it will cause the impeller imbalance and excessive wear of the impeller, and even block the impeller flow path and The central feed pipe prevents the crusher from working normally. When a large piece of material is found, it should be removed in time.

(4) When the discharge belt conveyor stops running, the feeding should be stopped immediately, so the discharge belt conveyor should be interlocked with the feeding system to open and stop. Otherwise, the impeller will be crushed and the motor will be burnt.

(5) The feeding of the underwater pelletizing machine should be uniform and continuous.

(6) During the operation of the underwater pelletizing machine, there must be no violent vibration or abnormal noise, otherwise, it should be stopped immediately for inspection, and the machine can only be driven in order after the fault is removed.

(7) The observation door should be sealed tightly during the working process of the underwater pelletizing machine.

What are the reasons why people choose underwater pelletizing machine?

The difference between the underwater pelletizing machine and other similar products is that it has a steady stream of water flowing through the mold surface, and it is in direct contact with the mold surface. The size of the pelletizing chamber is just enough to allow the pelletizing knife to rotate freely across the die surface without restricting the temperature of the water flow. The molten polymer has been extruded from the die, and the rotating knife cuts the pellets. And then the pellets are taken out of the pelletizing chamber by the temperature-regulated water and enter the centrifugal dryer. In the dryer of the underwater pelletizing machine, the water will be drained back to the storage tank, cooled and recycled; the pellets pass through the centrifugal dryer to remove the water.

This is how we see the irreplaceable role of underwater pelletizing machine in our daily lives and industrial production. Nanjing JlEYA, the pioneer of underwater pelletizing machine producing company in China, knows that every application is special. You can go and get more information about them

The structure of the engineering plastic twin screw extruder barrel is basically similar to that of the single-screw extruder screw barrel. From the appearance structure, the twin-screw extruder barrel is also divided into an integral barrel and a segmented barrel. The engineering plastic twin screw extruder is an upgrade of the single screw extruder, which has also greatly improved the efficiency of use.

• What are the reasons why people choose engineering plastic twin screw extruder?

• What is the workflow of engineering plastic twin screw extruder?

• What are the essential devices in the engineering plastic twin screw extruder?

What are the reasons why people choose engineering plastic twin screw extruder?

1. Improve labor efficiency

When the equipment is repaired, engineering plastic twin screw extruder only needs to loosen a few bolts, turn the worm gear box handle device to lift the upper part of the barrel to open the entire barrel, and then perform repairs. This not only shortens the maintenance time, but also reduces the labor intensity.

2. High torque and high speed

The development trend of engineering plastic twin screw extruder in the world is towards high torque, high speed, and low energy consumption. The effect of high speed is high productivity. engineering plastic twin screw extruder belongs to this category, and its speed can reach 500 rpm. Therefore, it has unique advantages in processing high-viscosity, heat-sensitive materials.

3. Wide range of applications

engineering plastic twin screw extruder has a wide range of applications and can be applied to the processing of a variety of materials

4. High output, high quality

engineering plastic twin screw extruder has other advantages of ordinary extruder, and can achieve high output, high quality and high efficiency.

What is the workflow of engineering plastic twin screw extruder?

The engineering plastic twin screw extruder used for profile extrusion is usually tightly meshed and rotated in different directions, although a few also use co-rotating twin screw extruders, generally operating at a relatively low screw speed, about 10 r/ min. The high-speed meshing co-rotating engineering plastic twin screw extruder is used for compounding, venting or as a continuous chemical reactor. The maximum screw speed of this type of extruder is 300-600r/min. Non-intermeshing extruder is used for mixing, venting and chemical reaction. Its conveying mechanism is quite different from intermeshing extruder, which is closer to the conveying mechanism of single screw extruder, although there are essential differences between the two.

What are the essential devices in the engineering plastic twin screw extruder?

Among the straightening devices used in engineering plastic twin screw extruder, the most common one is eccentric, and various types of bending of the core are one of the important reasons for the insulation eccentricity. In sheath extrusion, scratches on the sheath surface are often caused by the bending of the cable core. Therefore, the straightening device in various engineering plastic twin screw extruder is indispensable. The main types of straightening devices are: drum type (divided into horizontal and vertical); pulley type (divided into single pulley and pulley block); winch type, which has multiple functions such as dragging, straightening, and tension stabilization; Press wheel type (divided into horizontal type and vertical type), etc.

The engineering plastic twin screw extruders are used more and more widely in daily life, but its quality has a great influence on the experience of use. Nanjing JlEYA has focused on the production and development of engineering plastic twin screw extruders for more than several years, and they have always put the needs of customers as their top priority.

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 screw can be said to be the heart of the injection molding machine. The quality of the screw determines the quality of the product. The plasticizing screw of the engineering plastic twin screw extruder has the functions of conveying, melting, mixing, compression, metering and exhausting. It plays an important role in the quality of plasticization and is a key factor affecting the quality of plasticization.

• What is the difference between engineering plastic twin screw extruder and single screw extruder?

• What are the characteristics of engineering plastic twin screw extruder?

• What are the structural principles of engineering plastic twin screw extruder?

What is the difference between engineering plastic twin screw extruder and single screw extruder?

1. Price: single screw extruder has simple structure and low price; Engineering plastic twin screen expander is complex and expensive

2. Plasticizing capacity: single screw extruder is suitable for plasticizing and extruding polymers and granular materials. The shear degradation of polymer is small, but the residence time of material in extruder is long; The engineering plastic twin screw extruder has good mixing and plasticizing ability, and the residence time of materials in the extruder is short, which is suitable for powder processing.

3. In terms of processing capacity and energy consumption: the engineering plastic twin screw extruder has large output, fast extrusion speed and low energy consumption per unit output, while the single screw extruder is poor.

4. Operability: the single screw extruder is easy to operate and the process control is simple; The operation of engineering plastic twin screen expander is relatively complex and the process control requirements are high.

What are the characteristics of engineering plastic twin screw extruder?

1. engineering plastic twin screw extruder is divided into parallel and conical according to the relative position of the two axes;

2. engineering plastic twin screw extruder is divided into meshing type and non-meshing type according to the two screw meshing procedures;

3. engineering plastic twin screw extruder is divided into the same direction and the opposite direction according to the rotation direction of the two screws, and there are inward and outward points in the opposite direction;

4. engineering plastic twin screw extruder is divided into high speed and low speed according to the screw rotation speed;

5. engineering plastic twin screw extruder is divided into whole and combination according to the structure of screw and barrel.

What are the structural principles of engineering plastic twin screw extruder?

For the basic mechanism of the engineering plastic twin screw extruder process, in simple terms, a screw rotates in the barrel and pushes the plastic forward. The screw structure is an inclined surface or slope wound on the center layer, the purpose of which is to increase the pressure in order to overcome the greater resistance. As far as the engineering plastic twin screw extruder is concerned, there are three kinds of resistance that need to be overcome during work: one is friction, which includes the friction of solid particles (feeding) against the barrel wall and the first few revolutions of the screw (feeding zone). There are two kinds of mutual friction forces; the second is the adhesion of the melt on the cylinder wall; the third is the internal logistics resistance of the melt when it is pushed forward.

Nanjing JlEYA has focused on the development and production of engineering plastic twin screw extruders for several years. And it commits to provide perfect service for every customer from all over the world.

 A plastic extruder performs all of the following processes through a barrel with a screw and auger channel. The plastic pellets enter the barrel through a hopper at one finish of the barrel and are then transferred through the screw to the opposite finish of the barrel. What are the working principle and molding principles of a plastic extruder? The following is a detailed description.

 

Here is the content list:

• Working principle

• Forming principle

 

Working Principle

Pressure and shearing, etc., convert the solid plastic into a uniform and consistent melt and send the melt to the next process. The production of the melt involves processes such as mixing additives such as masterbatches, blending resins, and re-crushing. The finished melt must be homogeneous in consistency and temperature. The pressurization must be high enough to extrude the viscous polymer.

 

To have sufficient pressure, the depth of the threads on the screw decreases as the distance to the hopper increases. The external heating and the internal heat generated in the plastic and the screw due to friction softens and melts the plastic. The design requirements for plastic extruders often vary from polymer to polymer and from application to application. Many options involve discharge ports, multiple loading ports, special mixing devices along the screw, cooling and heating of the melt with or without an external heat source (adiabatic plastic extruders), the relative size of the gap variation between the screw and the barrel, and the number of screws. For example, twin-screw plastic extruders allow for more thorough mixing of the melt than single-screw plastic extruders. Tandem extrusion uses the melt-extruded from the first plastic extruder as feedstock for the second plastic extruder, which is typically used to produce extruded polyethylene foam.

 

D L the characteristic dimensions of plastic extruders are the diameter of the screw (D) and the ratio of the length of the screw (L) to the diameter D L/D (D) (L/D. Plastic extruders usually consist of at least three segments. The first section, near the L/D) filling hopper, is the filling section. Its function is to allow the material to enter the plastic extruder at a relatively smooth rate. In general, this section will be kept at a relatively low temperature to avoid clogging the charging channels. The second section is the compression section, where the melt is formed and the pressure is increased. The transition from the charging section to the compression section can be abrupt or gradual (gentle). The last half, the metering section, is adjacent to the plastic extruder outlet and its main operate is that the uniformity of the fabric flowing out of the plastic extruder. In this section, the material should have sufficient residence time to ensure uniformity of composition and temperature.

 

At the end of the barrel, the plastic melt leaves the plastic extruder through a head that is designed in an ideal shape for the extruded melt stream to pass through.

 

Another important part is the drive mechanism of the plastic extruder. It controls the rotational speed of the screw, which determines the output of the plastic extruder. The power required is determined by the viscosity (flow resistance) of the polymer. The viscosity of the polymer depends on the temperature and flow rate and decreases with increasing temperature and shear. Plastic extruders are equipped with screens that keep impurities out of the screen. To avoid downtime, the screens should be able to be changed automatically. This is especially important when processing resin with impurities, such as recycled material. The extruder's screw is divided into feeding section, plasticizing, melting section, temperature according to the process parameters of the plastic particles, the model according to the diameter of the screw 20, 36, 52, 65, 75, 95, 120, 135. Plastic particles heated by the movement of the screw to change the original state, there are many types, depending on the specific application. The capacity of the frequency conversion is proportional to the diameter of the screw and then adjusted according to the different raw materials.

 

Forming principle

The extrusion method of plastic extruders generally refers to the melting of plastic at a high temperature of about 200°C. The melted plastic is then passed through a die to form the desired shape. Extrusion molding requires a deep understanding of the characteristics of plastics and extensive experience in mold design and is a technically demanding molding method.

Extrusion molding is a method of a continuous flow of material through a die by heating and pressurizing in an extruder, also known as "extrusion molding". Compared with other molding methods, it has the advantages of high efficiency and low unit cost.

Extrusion is mainly used for molding thermoplastics, but it can also be used for some thermosets. Extruded products are continuous profiles, such as tubes, rods, wires, sheets, films, wire, and cable cladding, etc. In addition, it can also be used for mixing, plasticizing and granulating, coloring, blending, etc. plastics.

 

The extruded products can be called "profiles", which are also called "profiles" because of their irregular cross-sectional shape.

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