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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.

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.

Today, we loaded 2x40HQ export to Vietnam.

One is SHJ-50 twin screw extruder, the other is SHJ-72 twin screw extruders. Both extruders are used for making filler masterbatch.

Nanjing Jieya is a leading manufacturer of twin screw compounding extruders with over 20 years experience. We will offer you the top quality with best price.

We warmly welcome your inquiry.

DRIVE SECTION
The drive section of the twin screw extruder consists of 3 parts: motor, clutch, and gearbox.
The reduction and distribution gear unit reduces the motor speed to the screw shaft speed and distributes the input torque to the two output shafts. Clutch is installed between the drive motor and the gearbox drive shaft.
PROCESSING SECTION
The processing section of the twin screw extruder in SHJ series extruder consists of individual barrel sections which are replaceable. Depending on the process tasks, reserve feed port, liquid injection port or twin screw side feed port is available.
Owing to the modular design of the twin screw extruder screw elements and screw barrels, conveying, plasticizing, homogenizing, pressure build-up and devolatilization zones can be established, depending on the process task.
For product intake and conveying, screw elements are used. The extruder can be fed with powder, pellets, chips, melt, paste, etc.
Plasticizing, mixing and dispersing are done by the twin screw extruder kneading elements. By varying the thickness of the kneading disks and their angle of stagger, their mixing, shearing and dispersing action can be adjusted to the individual requirements.
The screw elements are arranged on screw shafts. The co-rotating and closely intermeshing screw shafts have a sealing profile.  
The screw barrels are supported by barrel supports. Axial displacement of the processing section resulting from thermal dilatation is absorbed by these supports.
EXTRUSION PART
The discharge section of the twin screw extruder consists of die head and screen changer, which is installed at the end of twin screw extruder discharging direction. There are several types of die heads and screen changers to meet the requirements of different polymers and processing technology.

underwater pelletizing machine plays an irreplaceable role in the current industrial production process. Only when the underwater pelletizing machine is used correctly can the greatest effect be achieved.

• What problems should be paid attention to when using underwater pelletizing machine?

• What is the cause of the friction clutch failure of the underwater pelletizing machine and its solution?

• How can the underwater pelletizing machine make the pellets cut out by pelletizing have no pores?

What problems should be paid attention to when using underwater pelletizing machine?

1. Pay attention to the temperature change of the underwater pelletizing machine at any time. When touching the sliver with clean hands, the temperature should be raised immediately. Until the sliver touches your hand, it is normal.

2. When the bearing part of the reducer burns, or is accompanied by noise, it should be repaired in time and refueled.

3. When the bearing parts at both ends of the bearing chamber of the underwater pelletizing machine are hot or there is noise, stop the machine for maintenance and add butter. During normal operation, add butter to the bearing chamber every 5-6 days.

4. Pay attention to the operating rules of the underwater pelletizing machine; such as: the machine temperature is high or low, the speed is fast or slow, and it can be dealt with in time according to the situation.

5. When the operation of the underwater pelletizing machine is unstable, pay attention to check whether the gap of the coupling anastomosis is too tight, and adjust it in time to loosen it.

What is the cause of the friction clutch failure of the underwater pelletizing machine and its solution?

Reason analysis: The instantaneous starting voltage of the main motor of the underwater pelletizing machine is too low, the friction disc and the friction disc are overheated, the friction disc and the friction disc are aging, and the air pressure of the friction disc is too low, etc., which can cause the clutch to disengage.

Solution: When starting the main motor of the underwater pelletizing machine, avoid peak power consumption and reduce the feeding load. The minimum restart interval is 30 minutes; in summer, when the main motor is restarted more than twice, it should be extended. Interval time or forced cooling with a fan. Blow with instrument wind and wipe off the dirt on the surface of the friction plate and friction plate with a rag. If the underwater pelletizing machine wears a lot or the surface becomes "vitrified", replace the friction plate and friction plate. Confirm whether the air pressure value can make the friction disc and the friction plate fit together.

How can the underwater pelletizing machine make the pellets cut out by pelletizing have no pores?

One: The different materials used by the underwater pelletizing machine must be separated clearly;

Two: The products produced by the underwater pelletizing machine should be dewatered as much as possible after being crushed and cleaned;

Three: The vent hole on the screw of the underwater pelletizing machine should be unblocked.

Nanjing JlEYA has various underwater pelletizing machines that can provide the increasing of products, and make them more effective, reliable, and consistent.

The twin screw extrudernot only has the characteristics of a single-screw extruder, but also has the advantages of convenient feeding, stable extrusion, and convenient exhaust. It is widely used in the production and processing of extruded products.

Why are twin screw extruders warmly welcomed now?

Choose a single-screw extruder or a twin screw extruder?

What are the technical points of the twin screw extruder?

Why are twin screw extruders warmly welcomed now?

The twin screw extruder can not only add more ingredients to the company's products, but also can choose to quickly complete the manufacturing. Considering that "new crown pneumonia" has put every industry into trouble, the market has been looking for a quick turnaround to pay for healthy food. In addition, you may need to make up for the loss of production and sales or increase production and sales based on the current situation. Twin-screw extension can help you, and considering the lower cost and higher production and sales, it can bring more profits.

Choose a single-screw extruder or a twin screw extruder?

The single-screw extruder is used for extrusion processing technology and equipment, and the particle raw materials stay in the extruder for a long time. This means that a single-screw extruder requires a longer period than a twin screw extruder to produce the products required by the enterprise. In addition, the twin screw extruder allows you to better control the complex operation process and actual operation. As everyone knows, these controls are much more complicated. This is very important for foods that need to be mixed and mixed. The production and manufacturing facilities are complete, and the actual effect of twin-screw extrusion is the best. For polymer materials, twin-screw extrusion is also particularly effective. Considering that the design concept of twin screw extruder has a relatively large flexibility, it can be used in many industries for very specific operation processes.

What are the technical points of the twin screw extruder?

In the extrusion process of the twin screw extruder, the material is transformed from the glass state to the molten state. In addition to the balance between the heat required for plasticization of the material and the amount of heat supplied, the material is melted. Pressure is also a very important control indicator. Because the material is affected by the compression ratio of each section of the die resistance screw during the extrusion process, it does not exist under normal pressure. For different die, the compression ratio of each section of the screw is basically constant and immutable. Under the premise of the same extrusion speed, increase or decrease the feed rate, the volume of the screw material in the feeding section will change, and the volume of the material in the exhaust section will remain unchanged, so the compression section of the feeding section changes with the compression ratio, and its melt pressure follows Increase or decrease; under the premise of the same feed rate, increase or decrease the extrusion rate, the volume of the screw material in the feeding section will also change. The volume of the material in the exhaust section remains unchanged, so the compression section of the feed section changes with the compression ratio, and its melt pressure increases or decreases accordingly; the feed speed increases or decreases simultaneously with the extrusion speed, because the volume of the screw material in the feed section remains unchanged , Only due to the increase or decrease of the speed, the melt pressure change.

Due to different fields and different types of twin screw extruder, they are widely used in many industries. To meet these growing demands, Nanjing JlEYA has committed to providing the increasing of twin screw extruder.

When the single screw extruder is in the extrusion molding process, its extruder screw is divided into 3 sections: feeding section (feeding section), melting section (compression section), metering section (homogenization section), these three sections Correspondingly, three functional areas are composed of materials: solid conveying area, material plasticizing area, and melt conveying area. Each area has different temperature requirements, and specific problems should be analyzed in detail. The temperature of the single screw extruder will be briefly introduced below.

• What is the general temperature of the solid conveying zone in a single screw extruder?

• What is the general temperature in the plasticizing zone of the material in a single screw extruder?

• What is the general temperature of the melt conveying zone in a single screw extruder?

What is the general temperature of the solid conveying zone in a single screw extruder?

The temperature of the barrel in the solid conveying zone of the single screw extruder is generally controlled at 100~1400C. If the feeding temperature is too low, the solid conveying zone will be extended, reducing the length of the plasticizing zone and the melt conveying zone, which will cause poor plasticization of the single screw extruder product and affect product quality.

What is the general temperature in the plasticizing zone of the material in a single screw extruder?

The temperature of the material plasticizing zone in the single screw extruder is controlled at 170~1900C. Controlling the vacuum degree of this section is an important process index. If the vacuum degree is low, it will affect the exhaust effect, resulting in bubbles in the pipe, and seriously reducing the mechanical properties of the pipe. In order to make the gas inside the material easily escape, the plasticization degree of the material in this section should be controlled not to be too high, and the exhaust pipe of the single screw extruder should be cleaned frequently to avoid blockage. The vacuum degree of the barrel is generally 0.08~0.09MPa.

What is the general temperature of the melt conveying zone in a single screw extruder?

The temperature of the melt conveying zone in the single screw extruder should be slightly lower, generally 160~1800C. Increasing the screw speed in this section, reducing the head resistance and increasing the pressure in the plasticizing zone are all conducive to the improvement of the conveying rate. For heat-sensitive plastics such as PVC, the residence time should not be too long in this section. The screw speed is generally 20 ~30r/min. The head of the single screw extruder is an important part of extruded product molding. Its function is to generate a higher melt pressure and make the melt shape into a desired shape. The process parameters of each part of the single screw extruder are: die connector temperature 1650C, die temperature 1700C, 1700C, 1650C, 1800C, 1900C.

This is some information related to the use of single screw extruders. The use of single screw extruders is also closely related to the quality of its products. If you need more information, please contact Nanjing JlEYA.

The plastic extruder is a common plastic machinery equipment, in the process of the daily operation of the extruder, the extruder will have a variety of failures, affecting the normal production of plastic machinery, the following we will analyze the extruder failure.

 

Here is the content list:

• Unstable host current

• The main motor can not start

• The head is not discharged smoothly or blocked

• The main electric starting current is too high

• The main motor makes an abnormal sound

 

Unstable host current

1. Production reasons.

(1) Uneven feeding.

(2) The main motor bearing of the plastic extruder is damaged or poorly lubricated.

(3) A section of the heater is out of order and does not heat up.

(4) The screw adjustment pad is not correct, or the phase is not correct, and the component interferes.

2. Treatment methods.

(1) Check the feeder, troubleshooting.

(2) Overhaul the main motor of the plastic extruder, replace the bearings if necessary.

(3) Check whether each heater is working properly, replace the heater if necessary.

(4) Check the adjustment pad, pull out the screw to check whether there is interference with the screw.

 

The main motor can not start

1. Causes.

(1) There is a mistake in the start-up procedure of the plastic extruder.

(2) The main motor thread has a problem, whether the fuse is burned ring.

(3) The main motor-related chain device to function

2. Treatment methods.

(1) Check the program, reboot the machine in the correct boot sequence.

(2) Check the main motor circuit.

(3) Check whether the lube oil pump of the plastic extruder is started and check the status of the chain device associated with the main motor. The oil pump is not on and the motor cannot be turned on.

(4) The inverter induction power has not been discharged. Turn off the main power and wait for 5 minutes before starting again.

(5) Check whether the emergency button is reset.

 

The head is not discharged smoothly or blocked

1. Causes.

(1) A section of the heater does not work, and the material is not plasticized well.

(2) The operating temperature setting is low, or the molecular weight distribution of plastic is wide and unstable.

(3) There may be foreign substances that do not melt easily.

2. Treatment methods.

(1) Check the heater of the plastic extruder and replace it if necessary.

(2) Verify the set temperature of each section, and if necessary, consult with the technician to increase the temperature setting.

(3) Clean and check the extrusion system and the head.

 

The main electric starting current is too high

1. Causes.

(1) Insufficient heating time and high torque.

(2) A section of the heater does not work.

2. Treatment methods.

(1) Apply hand pan machine when starting, if not easy, extend the heating time or check whether each section heater is working properly.

 

The main motor makes an abnormal sound

1. Produced by.

(1) The main motor bearing of the plastic extruder is damaged.

(2) The main motor silicon controlled rectifier line in silicon controlled damage.

2. Treatment methods.

(1) Replace the main motor bearings.

(2) Check the silicon-controlled rectifier circuit, if necessary, replace the silicon-controlled components.

 

Our company's website is https://www.njjyextrusion.com/. If you still have questions, you can contact us on the official website.

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