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

In order to prevent the oxidation of the abrasive tool and the blockage of the nozzle, the furnace must be cleaned by the melt-blown cloth nozzle (spinneret) which can be vacuum or atmosphere



Spinneret cleaning and sintering curve setting:

A vacuum sintering:

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

2. Heat at 350℃ for 1 hour.

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

4. Heat at 450℃ for 2 hours.

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

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

B Protective atmosphere sintering:

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

2. Heat at 350℃ for 1 hour.

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

4. Heat 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 after calcination of spinneret:

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 ultrasonic cleaning machine can be opened.

2. The cleaning time depends on the power of the cleaning machine, and it is generally recommended that it be 1 to 2 hours. When cleaning, a small amount of sodium hydroxide can be appropriately added to improve the cleaning effect.

3. 300,450 spinneret is recommended to add 0.1 kg, 600,800 is recommended to add 0.2~0.3 kg. 1.6m spinneret is recommended to add 0.4~0.6 kg. 3.2 m spinneret is recommended to add 0.8~1.2 kg. After cleaning, the spinneret must be washed immediately with clean running water.

4. All parts of the spinneret must be dried with oil-free and water-free compressed air immediately after washing.

After cleaning the spinneret, assemble:

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

2. The screws must be coated with high-temperature grease that can withstand a temperature of more than 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 hot. That is, when the temperature of the touch head reaches more than 200, install and tighten the first screw. Then open the hot air, and raise the temperature of the feeler head and the hot air temperature to no more than 5 from the normal operating temperature. After the temperature is reached, the constant temperature is not less than 40 minutes, and then the second heat tightening.

6. Use: When checking the air seam of the spinneret, scraper, scraper, etc., special tools made of purple copper plate with appropriate thickness must be used. Do not substitute other materials. Before cleaning, spray some spray silicone oil on special tools properly, and the effect is better.

7. In the work of the spinneret, the temperature is strictly prohibited from being too high or too low. The temperature of the head and the hot air should be between 200 and 270. The pressure of the spinneret is not allowed to exceed 2MPa. The melting finger of the melt-blown raw material is recommended to be 1500. The maximum positive and negative fluctuation is 200. Plate disassembly: the disassembly of the spinneret must be carried out at high temperature, and the temperature is appropriate for normal use. Cold disassembly of spinnerets is not allowed. The special tool made of purple copper plate in the disassembly process cleans up the attached solution in time to avoid burning during sintering, which leads to uncontrolled temperature.