Several methods of reducing resistance of meltblown cloth are taught in detail, and the master summarizes

Maintaining the working efficiency of the meltblown machine and reducing the resistance of the meltblown cloth as much as possible has become a new issue that the current meltblown cloth factory needs to overcome. For example, for a meltblown cloth weighing 25 grams, the single-layer resistance is controlled below 60pa at a flow rate of 85L/min, and the double-layer resistance is controlled below 120pa. At a flow rate of 95L/min, the single-layer resistance is controlled at 60-70pa, and the double-layer resistance is controlled at Below 150pa is ideal.

How to achieve a balance between maintaining efficiency and reducing resistance is a test of the level of the tuner. The following is the experience of 12 strokes shared by an actual combat machine adjustment master, which can be referred to as appropriate by all cloth factory owners.

1. Reduce the speed of the main engine and reduce the volume of the metering pump.

How to control the reduction of metering requires you to record carefully and debug patiently. Assuming that your meltblown machine is 1600mm wide, it is generally divided into 9 rolls and a width of 175mm as an example. Some customers are not calculated at 175 and so on.

For example, for a meltblown cloth with a gram weight of 25 (g/m2), you should basically keep your sample (sampling a circular cloth with a diameter of 100 square centimeters ≈ 11.3 centimeters, as shown in the picture above) at a gram weight of 0.25 to 0.28 grams. Assuming that the meltblown cloth we are going to do now is between 0.25-0.28, use a grammeter to test the weight of a single piece. Record the data, and mark each roll by 1~9. At this time, put the total amount of 1~9 on the grammeter to obtain a total data.

For example, let's say we have 1 roll 0.27, 2 roll 0.28, 3 roll 0.27, 4 roll 0.29, 5 roll 0.26, 6 roll 0.26, 7 roll 0.28, 8 roll 0.25, 9 roll 0.25, then put all the original films The weight meter calculates the weight divided by 9, and we calculate an average of 0.268. Assuming your weight/9, the calculated average is between 0.25 and 0.28, which proves that your measured weight is correct. Adjust the gram weight of each roll later. According to the 4th roll above, 0.29 exceeds the gram weight. Here, each roll is adjusted individually, remember this sentence: the small gram will heat up, and the heavy gram will cool down.

2. The above steps are completed to control your amount. The weight of each roll is different, and the tested values are also different. It is to ask you to adjust, within the controllable range, to increase the efficiency of the cloth, and the gram weight is heavy. The efficiency of spraying is also high, but the resistance is also increased.

3. Increase the flow of hot air and increase the hot air.
4. The above elements are basically to control your cloth with high filtration efficiency. Let's deal with the most critical resistance problem.

5. Increase the DCD (receive distance), assuming your distance is 16 cm, the DCD is changed to 16.5 cm, and so on, record the data for fine-tuning.

6. The distance is changing, and the air suction volume at the bottom of the net also changes, because polypropylene is entangled into fibers by its own heat. The closer the distance, the greater the heat, and the air suction at the bottom of the net should be increased; the farther the distance, the lower the suction at the bottom of the net.

When you move the distance, you must control the suction air volume at the bottom of the net, adjust it slightly, and do not reduce it in a large range. Record the data when you move, adjust step by step to the best, the resistance will decrease, and the spraying efficiency will be reduced. Within a controllable range, maintain efficiency and reduce resistance, and strike a balance between the two.

7. Reduce the speed of the conveyor belt and the speed of winding, within the controllable range.

8. The temperature of the hot air is controlled in a state of no flying flowers, and the temperature of the hot air will decrease when the distance is close.

9. The most important factor of resistance is DCD, the gram weight of cloth. It is convenient to do more detailed articles here. DCD is changing, and so must the data. When the efficiency decreases, the air volume and air temperature are increased, the main engine speed is slowed down, and so on. All of the above are detailed.

10. The resistance is low in efficiency. As long as the air volume and air pressure are increased, the speed of the main machine is reduced, and the temperature of each area of the mold is maintained at the gram weight. If the gram weight is insufficient, the temperature can be increased slightly. Keep the gram weight within the adjustable range.

11. The electrostatic electret does not need to be repeated, it is enough to basically keep it free of sparks.

12. Note that the filter should be changed every 2 hours, and the resistance will also be affected for a long time.