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Raw paper holes can be divided into wet section holes and dry section holes. What should I do when these holes appear? Starting from the cause of the holes, explain one by one.
Holes in Wet End of Base Paper
1. PEO holes: Generally caused by the brewing quality problem and the process of replacing PEO. The shape of the holes is long and there are lace on the periphery. It does not appear in the base paper for a long time. There are no periodic, generally large to small woolen cloths. It will disappear after a period of time.
The solution is to control the brewing quality of PEO and clean the dilution tank filter in time!
2. The dirt on the felt can block the breathable eyes of the felt, which reduces the dehydration ability of the blocked position, making it difficult to sizing at this position, which usually results from the resin in the slurry and the glue of the wet strength agent. Objects come off and adhere to felts and forming nets, and the shape of the holes is the form of the adherent.
The solution is: stop the machine and check or clean the felt and the pulp hanging area!
3. Felt compaction refers to the fact that a certain part of the felt is covered with dirt slurry, PEO blocks, or the idler roller stays on the dryer surface for too long during shutdown, which causes the felt to be burnt. In addition, it is sometimes caused by the cleaning of the felt. As a result, this hole wool cloth appears periodically, with irregular shapes but lacing around it.
Solution: Start the felt high pressure pump for cleaning. You can also find the position and pierce the position with a needle. In severe cases, you can only replace the felt!
4. The wool cloth is used in the late stage, the wool cloth will lose hair seriously, the wool cloth will be difficult to sizing, it will produce holes, the shape is generally long, there are lace around the periphery, there is no fixed periodicity and regularity, often this situation can only be replaced after the wool cloth appears Can be solved!
5. The long life cycle of the felt reduces the dehydration capacity and narrows the usable position. Generally, the holes appear on both sides of the paper, and the shape is generally long. The periphery is laced and has a certain periodicity.
Solution: Regularly adjust the position of the wool using the wool corrector to make it normal!
6. Different cage angles are related to different paper grades and machine speeds. The net speed changes with the speed of the vehicle. At this time, the degree of dehydration is different. The vacuum degree of the three vacuum chambers in the cage needs to be adjusted to apply. change.
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