How To Protect Press Felt
Reason of Felt Lint
There are many reasons for the damage and the lint of the felt, mainly two of which are scraped by machine parts and chemical damage.
1.The most common reason is that the surface of the press felt torn loosened by high pressure water.
2.Lack of lubricating water between the vacuum panel and the blanket, which causes the temperature rise and the fiber is damaged.
3.Material of Vacuum suction cover is bad,large in friction coefficient, the edges of the cover and the seam has burrs or with sharp blade shaped, without rounding out the edges,the wrap Angle between the vacuum box and blanket is too large, high vacuum degree, local surface irregularities,fixed screw exposed,the above will lead to blanket abrasion.
4.Supporting roller surface with burrs, iron molds , the roller surface wrapped with slurry, or expander roller rubber thread stand is too high or stand has obvious edges and corners,no sharp edges exists between eight openings and rubber roller body or the high and low transition zone is too short, etc are likely to cause felt abrasion .
Solution to Protect Felt
1.For paper machine especially middle speed or high speed paper machine,the rational use of lubricating water now only benefit to the clean degree of the blanket but also produce a water film between the vacuum panel and felt which play a role as a lubrication, sealing and cooling effect.
2.Vacuum panel slit between the two strips should be used the same material as the panel material or lower wear-resisting performance than the panel material. From the outside of the vacuum area from dense to sparse and with appropriate amount of lubricating water.
3.All supporting roller surfaces should be smooth without burrs and rust,and copper rollers, stainless steel rollers and rubber rollers are options.
4.There is a speed difference between the relevant transmission points, causing the felt to rub and wear out.Adjust the speed ratio of each transmission point correctly to avoid the abnormal speed difference.
Single Layer paper machine felt is made up of single base layer fabric and fiber layer. Base layer is woven from synthetic filament or multi-filament. The structure is designed base on different paper machine, different press position and different type of paper.
Double Layer paper machine felt includes 1+1 composite structure and double layer of MD yarn structure. 1+1 composite structure BOM is consisted of two different thickness of base material. Both of these base materials can be changed to different construction and sizes to suit the requirement of different paper machines.
Triple layer paper machine felt includes 1 +2, 2 +1 and 1 +1 +1 composite BOM felt.
Applying to high speed of the paper machine for suction complex press, large diameter nip roll press and shoe press and can produce high-grade newsprint, write paper, paperboard etc.
1.Water filtering function:As a dehydration medium, when the paper sheet is dehydrated in the vacuum box and press area, the paper blanket absorbs and filters out the water from the paper sheet.
2. Leveling effect:In the process of web transfer and dehydration, it can smooth and modify the paper surface.
3. Function of conveyor belt:The paper is transferred from the net part to the drying shaft through the pressing part, and the passive roller and net cage are driven to run.
| Felt series |
Application |
Technical Parameter |
| Single Layer BOM Felt |
Single Layer Forming BOM Felt |
Paper machine |
Cylinder, Super Forming, Fourdrinier, Inclined Wire Machine, Nip Wire Machine etc. |
Felt GSM |
700-1200g/m2 |
| Single Layer Press BOM Felt |
Working speed |
≤800m/min |
Felt GSM Tolerance |
≤±4% |
| Air Permeability |
30-120cfm |
| Single Layer Top BOM Felt |
Paper kind |
≥8g/m2 all kinds of paper |
Tensile Strength |
≥2000N/5cm |
| Elongation Percentage |
≤1% |
| 1.5 Layer BOM Pulp(Paper) Felt |
Line pressure |
≤80KN/m |
Width Variation |
≤±2cm |
1.Forming Fabric https://sunhong.en.made-in-china.com/product-group/dormXeQCbuhn/Forming-Fabric-1.html
2.Paper Machine Felt https://sunhong.en.made-in-china.com/product-group/dbYmvynchuVQ/Paper-Machine-Felt-1.html
3.Dryer Fabric https://sunhong.en.made-in-china.com/product-group/ZoUEKFQvCPWx/Dryer-Fabric-1.html
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