Aug. 24, 2019
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In recent years, the paper-making dry network has developed very rapidly in China. The weaving manufacturers of the dry mesh and the paper mills have closely communicated and exchanged, and continuously improved and improved the weaving process of the net to meet the rapid development of the paper-making industry. The manufacturers of net looms have put forward more requirements in design. Shijiazhuang Textile Machinery Co., Ltd. always meets the requirements of customers, constantly communicates with manufacturers, and constantly improves the design of dry looms according to customer requirements. Higher requirements for customers.
The paper-making dry net is mainly used in the drying part of the paper machine. Its main function is to convey the wet paper and the paper is dried by the front drying oven during the transfer.
Double warp flat wire:
Due to its high fabric strength, good air permeability and high drying efficiency, the double warp flat screen is more suitable for ordinary wrapping paper which does not require high surface performance.
Spiral dry network:
The spiral dry net is characterized by dirt resistance, almost seamless design, high wear resistance and easy cleaning; side effects are obvious on the paper surface.
The main material of the dry mesh is polyester monofilament, the polyester yarn is divided into round wire and flat wire, and the woven mesh is divided into a round wire dry wire and a flat wire dry net. From the customer's use effect, the flat wire The effect is better than round wire. The flat wire can contact the paper more comprehensively, reducing the chance of mesh marks, and on the other hand, it is easier to clean the adhesion of the adhesive.
In addition to the design of the wire geometry to avoid dry mesh pollution, the adhesion to the adhesive substance needs to reduce the surface energy by adding fluorine-based substances to the polyester material, thereby causing the pollutants to not adhere to the surface easily. Therefore, the black matter of the stickies caused by the dry mesh dirt, the decrease of the air permeability, the insufficient drying ability, the unevenness of the paper machine banner, and the black spots are caused.
3. Resistance to hydrolysis
Since the dry network operating environment is mainly inside the closed hood, the environment is in a severely high temperature and high humidity environment. In addition, some raw papers are non-neutral in pH and therefore very corrosive to polyester materials. The end of the life of most dry nets is not due to dry net wear (dry net is different from forming net and felt, almost all rolling friction), but due to dry net hydrolysis caused by dirty or corroded dry net. In order to reduce the risk of hydrolysis, an anti-hydrolysis agent is usually added to the dry mesh to reduce this tendency.
Dry network use precautions:
The joint is the weakest link of the dry mesh strength, so the strength of the threading and the dry mesh joint operation should be paid attention to;
Dry mesh joints are also the most prone to dry paper marks on the paper surface. In addition to changing the selection of dry mesh seams, reducing the tension of the dry mesh, reducing the large wrap angle of the dry net, and greatly bending the path can effectively avoid such problem.
Due to the constant collision of the palms at the edge of the dry mesh, if the edge of the dry mesh is poorly woven or hydrolyzed, it is easy to have a problem of edge crepe.
In many cases, the production staff will think that the same or similar length of the dry network can be interchanged at random. It should be noted that in the dry network selection, the manufacturer has already matched the dry network design. The dry network in the high evaporation section often contains It must be resistant to hydrolysis, so it is not recommended to change the position of the dry mesh unless there is a shortage of spare parts.