In recent years, the development of our country 's paper industry is very rapid, for the continuous improvement of the papermaking dry net fabrication technology, to meet the rapid development of the paper industry, also put forward higher requirements for manufacturers in the design. This kind of equipment is mainly used in airtight hood, so what requirements are put forward for the design of paper dry net?
Paper dry web is mainly used in the dry part of the paper machine. Its main function is to transfer the wet paper and dry the paper through the front drying cylinder during the transfer process. Due to its high fabric strength, good air permeability and high drying efficiency, double warp flat wire dry mesh is more widely used in ordinary packaging paper with low surface performance requirements.
Spiral dry net
Spiral dry mesh is characterized by dirt resistance, nearly seam free design, high wear resistance and easy cleaning; the side effect is obvious paper mesh mark
At present, the main material of dry mesh is polyester monofilament, polyester filament is divided into round filament and flat filament, and the woven mesh is divided into round filament dry mesh and flat filament dry mesh. From the perspective of customer use effect, the effect of flat filament is better than that of round filament, flat filament can contact paper more comprehensively, reduce the occurrence rate of mesh marks, on the other hand, it is easier to clean the adhesion of adhesive fabric.
In addition to the design of the geometry of the silk thread to avoid the pollution of the dry net, the adhesion of the stickies also needs to reduce the surface energy by adding fluorine in the polyester material, so that the pollutants are not easy to adhere to the surface, so it greatly reduces the black particles of the Stickies caused by the dirt collection and scaling of the dry net, the lack of drying ability caused by the decrease of air permeability, and the paper The occurrence of paper diseases such as uneven moisture and black spots on the banner of the machine.
Because the operation environment of the dry network is mainly inside the airtight hood, the environment is in a high temperature and high humidity environment. In addition, the pH value of some base paper is not neutral, so the corrosion of polyester material is very serious. The end of the service life of most dry nets is not due to the wear of dry nets (almost all of them are rolling friction, which is different from formed nets and woollen cloth), but to the hydrolysis of dry nets caused by the dirty or corrosion of dry nets. In order to reduce the risk of hydrolysis, anti hydrolytic agents are usually added to the dry wire to reduce this trend.
Precautions for use of dry network
The joint is the weakest part of the strength of dry mesh, so we should pay attention to the strength of threading and the operation of dry mesh joint;
In addition to changing the type selection of the dry mesh joint, reducing the tension of the dry mesh, reducing the large wrapping angle and bending path can effectively avoid such problems.
Due to the constant collision of the correction touch palms on the edge of the dry mesh, if the edge of the dry mesh is poorly woven or hydrolyzed, it is easy to have the problem of the edge wire dropping, and attention shall be paid to the inspection every time the machine is stopped;
In many cases, the production personnel will think that the same or similar length of dry network can be interchanged at will. Here, it should be noted that when selecting the dry network, the manufacturer has matched the design of the dry network to a certain extent, and the dry network in the high evaporation section often has a certain anti hydrolysis ability. Therefore, unless there is a lack of spare parts, it is not recommended to change the use position of the dry network at will.
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