Paper Machine Press Felt
The function of the pressing section:
1. Dehydration
2. Transfer paper web
3. Improve the strength of paper
Problems that are prone to occur in the press section
1. Paper feeding is not smooth
2. Paper diseases: discounting, bubbling, layering, sticking paper, edge banding, edge peeling, crushing, etc
3. Vacuum, high-pressure water, speed difference, line pressure
Example for Second Press Felt Design
Second Press Top Felt
Base configuration:
A-layer (MD / CD): 4-ply twisted /monofilament
B-layer (MD /CD): mono/mono
C-layer (MD /CD): mono/mono
Fiber batt distribution:
Paper side: 250 g/m2-11 dtex
400 g/m2-44 dtex
Roll side: 200 g/m2-44 dtex
Treatment: pre-compaction included
Second Press Bottom Felt
Base configuration:
A-layer (MD / CD): 4-ply twisted /monofilament
B-layer (MD /CD): mono/mono
C-layer (MD /CD): mono/mono
Fiber batt distribution:
Paper side: 300 g/m2-11 dtex
450 g/m2-44 dtex
Roll side: 150 g/m2-44 dtex
Treatment: pre-compaction included
Installation of felt
02 Before the felt is flattened on each roll, it is not allowed to drop the top press roll, couch roll or support roll. Never pressurize the press roll until the paper machine is running normally.
03 When the felt is running slowly until it is running well, moisten the felt evenly with water until the water is saturated, then adjust the tension to stretch the felts to the optimum length, width and dehydration condition.
04 There shall be sufficient gap between the spoke and the shaft sleeve or between the spoke and the spoke to make the felt easy to cover and avoid pulling the felt in through the gap.
05 Before starting the machine, check whether there are foreign matters on the top and bottom of the felt, as well as pressing and auxiliary devices.
06 The running direction of the felt on the paper machine shall be marked by the arrow on the felt surface.
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