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Where can I solve the problems encountered in the papermaking process?

October 12, 2020

 


Question 1 Paper falling off the paper threading blanket


The main reason for the paper dropping of the paper-drawing blanket is that the initial air permeability of the felt is too high, the swelling and saturation of the felt is insufficient, and the surface of the felt cannot form a water film to absorb the wet paper; the flatness of the carpet surface is not enough, and the floating hair is also the paper-drawing One of the reasons for the paper to fall off the blanket.

 

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Question 2 Threaded blanket through pulp


The main reason for the penetration of paper-making paper-making blanket may be that the initial air permeability of the blanket is too large, the blanket is difficult to swell and saturate, the blanket's basis weight is too low, and the water capacity space is insufficient, the blanket’s basis weight is too high, and the blanket itself has too much water content. It is not ruled out that the fiber selection of the blanket or the fiber amount is not enough to retain water when the quantification is reasonable, which leads to the penetration.

 

 

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Question 3 Pinholes, holes, and pulp on paper


The pinholes and holes of special tissue paper are usually caused by the net, but the holes caused by the felt slurry and inlay are not excluded. The blanket mainly solves the needling density of the paper connecting surface to prevent fluffing.

At the same time, it can improve the flatness and fineness of the felt surface to prevent the needle marks from inserting the slurry and forming holes in the paper.

 

 

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Question 4 The blanket is shed and worn


For the special tissue paper that needs printing and coating, the lint and abrasion of the felt are as serious as the paper powder falling off, which will cause the paper to interrupt the paper during the printing and coating process, and the color of the paper will be poor.

In particular, the speed of printing presses and coating machines are getting faster and faster, and the requirements for paper defects are higher. Therefore, the interweaving density and tightness of the paper surface of the felt is particularly important, and it is necessary to prevent fuzzing, linting and abrasion.

 

 

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Question 5 Vacuum marks, groove marks, and carpet marks


Generally, the quantitative design of the blanket is not reasonable enough, the insufficient water-holding space of the blanket and the reduced dehydration capacity will cause the blanket to appear vacuum marks, groove marks, and carpet marks in the middle and late stages.

Strengthen the cleaning of blankets, and proper loosening can help alleviate such paper diseases. The focus of the blanket is to improve the dehydration capacity.

 

 

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Question 6 Bubbles between the paper blankets when entering the positive press


This kind of phenomenon mainly occurs in the flat press, especially in the press area after long-distance paper blanket contact.

This requires that the blanket must have a smooth, delicate surface and a suitable initial air permeability.

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