Forming and dryer fabric series

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Forming fabrics
 
Characteristics
Forming fabrics are used for the initial stage of water removal. The characteristics of polyester forming fabric are that they are long-lasting, have good wear endurance, are high strength, have weak alkaline resistance and acid resistance. They also have less wire marks, a better sheet smoothness, are light weight, convenient to transport and are simple to install.
 
Installation 
1. Inspect the facility and the activity of the conveyor system before start-up. The top surface of the fabric should be smooth.
2. The moving direction has to be the same as shown by the arrow indicated on the fabric. Put the fabric in the correct position, keeping the conveyor rolls parallel to each other to prevent the fabric running off.
3. The PM should have a high nip peak pressures arrangement for cleaning the fabric, the hydraulic pressure should not be lower than 1.5-2.0MPa when the paper machine is running at low speed, if the running speed is over 550m/min, the hydraulic pressure should not be lower than 2.0-2.5MPa using over 2.0-2.5MPa of the hydraulic pressure in multilayer forming section. The water should be clean and without minerals or contamination. 
4. Tighten the fabric before start-up, water-lubricate before running, the tension of the fabric should be at ease before pulping. Keep the tension to 3-4KN/M in the low running speed, 4-6KN/M in the average to the high running speed.
 
Operation 
1. The fabric will elongate at the start of running, adjust the tension momentarily after running for one to two days and the tension will stabilize after three days. 
2. The hydraulic pressure cleaning has to run continually during operation. In order to keep the fabric in shape, the hydraulic pressure should be turn off after the paper machine stop.
3. Use a soft brush and add 5 percent of the alkaline solution or 10 percent of the acid solution for large area cleaning, then wash with plenty of water.
4. The fabric should be released if the machine stops for a long period. Take the fabric out during any repair or maintenance done to the machine. Do not run rollers in reverse direction.
 
 
Notes
1. The fabric fitting tools should be kept in a safe place to prevent the fabric getting damaged. 
2. Fabrics cannot operate when dry, do not stress the fabric. Operate within the suggested tension strength the fabric may run off or get damaged.
3. Do not use high pressure cleaning or a metal brush to clean the fabrics. 
4. Keep the fabric away from the high temperature or smoke, do not use strong alkaline or acid to wash.
5. Fabrics should be stored at room temperature they should be used within six months. Keep the fabrics in a dry room.
 
 
Dryer fabrics
 
Function 
Dryer fabrics are constructed of polyester monofilament, their main function is to remove the water on the paper sheet by using evaporation. 
Dryer fabrics are divided into one and a half layer and double layer fabric. They can be pin seam or endless seaming.
 
Characteristics
1. Triple the lifespan compared to felt and canvas.
2. High strength, good rigidity, good wear resistance, corrosion and contamination resistance, dimensional stability.
3. High permeability and smooth surface.
4. Light weight, convenient to transport.
 
 
Notes
1. The loose warp can be trimmed if the edge of the fabric curls in the running process, then use an iron to melt the loose warps together.
2. Any minor damage of the fabric due to the manufacture process, we can use monofilaments to sew it up.
3. Turn off the air valve for any reason to stop the machine. Release the fabric to avoid distressing or aging the fabric. 
4. Use gasoline or detergent to clean the oil dirt on the fabric, use plenty of water to clean it. 
5. Fabrics should be kept far away from: fire, high temperature during transportation, storage, installation, repair and running in order to avoid burning or aging, furthermore, fabrics should be kept away from objects with sharp edges.