Collect    |   Contact    |  中文 / EN

SERVICE SUPPORT



Service Centre

Tel: 0371-6320 2801
0371-6320 2805
Sale Service: 0371-6320 2805
Duty Manager:
MR. CAI: 181 0371 5723
Email : nbd@nbdkj.com
    FAQ Current Location:Home > FAQ

Melt-blown cloth nozzle (plate) mold disjunction cleaning and installation precautions

Release time:2020-05-03  Number of views:2933

Melt-blown cloth nozzle (plate) mold disjunction cleaning and installation notes:

In order to prevent the oxidation of abrasive tools and the blockage of the nozzle, the furnace must be cleaned with the nozzle of meltblowout cloth (spinneret) which can be vacuum or atmosphere.

 

Setting of cleaning and sintering curve of spinneret:

A Vacuum sintering:

1. The vacuum degree of the cleaning furnace should reach 100 ~200Pa during sintering, and the temperature should rise from room temperature to 350℃ in 60 minutes. The vacuum will start when the temperature reaches 100℃;

2. Keep warm at 350℃ for 1 hour.

3. Raise the temperature from 350℃ to 450℃ for another 30min.

4. Keep the temperature at 450℃ for 2 hours.

5. When the temperature in the furnace is less than 100℃, the air intake valve is opened at the temperature, so that the air is slowly discharged into the furnace.

6. After atmospheric pressure, open the door of the cleaning furnace and cool it naturally.

B protective atmosphere sintering:

1. Close the furnace door and send protective nitrogen. At the beginning, the gas flow is larger and is used to push the oxygen in the furnace. 10 minutes later, reduce the air intake, clean the furnace began to heat up, 60 minutes to raise the temperature from room temperature to 350℃

2. Keep warm at 350℃ for 1 hour.

3. Raise the temperature from 350℃ to 450℃ for another 30min.

4. Keep the temperature at 450℃ for 2 hours.

5. When the temperature in the furnace is less than 100℃, close the intake valve, open the cleaning furnace door, and cool it naturally.

Ultrasonic cleaning of spinneret after calcination:

1. Ultrasonic cleaning: When the temperature of the spinneret is below 50°, it can be put into the ultrasonic cleaning machine. After the water level is completely submerged the spinneret, the ultrasonic cleaning machine can be opened.

2. The cleaning time depends on the power of the cleaning machine. Generally, 1~2 hours is recommended. A small amount of sodium hydroxide can be properly added to improve the cleaning effect.

3. It is recommended to add 0.1 kg to 300 and 450 spinnerets and 0.2~0.3 kg to 600 and 800 spinnerets. It is recommended to add 0.4~0.6 kg to 1.6 meter spinneret. It is recommended to add 0.8~1.2 kg to 3.2 meter spinneret. Rinse the spinneret with clean running water immediately after cleaning.

4. All parts of the spinneret must be dried with compressed air without oil and water immediately after the end of washing.

After cleaning the spinneret, assemble:

1. Before installing the spinneret head, the joint surface between the spinneret and the tapping head must be checked to ensure that there is no foreign matter.

2. The screw must be coated with high-temperature grease that can withstand a temperature exceeding 350.

3. Tighten the screws in steps from the middle to both sides.

4. When fastening screws, it is recommended to use 30~40 nm torque for the first time and 70~80 nm torque for the second time.

5. It is recommended to install the spinneret in hot charge. That is, when the temperature of the head reaches more than 200, install and tighten the first time screw. Then turn on the hot air and raise the temperature of the sensor and the hot air to no more than 5 from the normal operating temperature. When the temperature is reached, the constant temperature is not less than 40 minutes, and then the second heat tightening.

6. Use: Special tools with appropriate thickness made of purple copper plate must be used when inspecting the air seam, scraper and air scraper of the spinneret. Do not use other materials instead. Cleaning before the special tools appropriate spray some silicone oil, the effect is better.

7. It is strictly prohibited that the temperature of the spinneret is too high or too low when working. The temperature of the touch head and hot air should be between 200 and 270. The pressure of the spinneret is not allowed to exceed 2MPa. It is recommended that 1500 be used as the melting finger of the melt-blown raw material. The maximum positive and negative fluctuation is 200. Plate disassembly: The spinneret disassembly must be carried out at high temperature, and the temperature should be the normal operating temperature. Cold disassembly of spinneret is not allowed. Special tools made of purple copper plate are used in the disassembly process to clean up the attached solution in time to avoid combustion during sintering, which leads to uncontrolled temperature.

Next article:After-sales service