Paper web double wire forming process

Abstract

The invention provides a paper web dual-net forming technology. In order to solve the technical problem that the influence is generated by bubbles in pulp in the papermaking process, the technology comprises the steps of feeding, injecting, twisting, water extruding, water absorbing and forming output; by improving the traditional papermaking technology, after pulp is injected into a first forming net and a second forming net, by adding the twisting step, bubbles in the pulp are twisted out by twisting the pulp; meanwhile, by means of the gravity of the pulp, the follow-up pulp has the punning effect on previous pulp, and the quality of paper webs is improved.

Description

technical field [0001] The invention relates to the technical field of paper web and cardboard forming, in particular to a paper web double-wire forming process. Background technique [0002] In the manufacture of paper from aqueous lignocellulosic feedstock, initial forming takes place on a forming wire, such as a Fourdrinier wire section, or in a twin-wire former, such as a so-called batch former, in which a pair of opposing wire loops moving in the same direction forms a closed interval , the jet of stock is fed from the stock box into the batch into the space between the forming wires; in order to start forming the web, by leaving the stock randomly distributed over the forming wires or between the forming wires moving together , removes the moisture in the slurry passing through the forming wire, and gradually dehydrates the slurry to form a paper web. [0003] However, due to increasing the speed of paper machines to improve the economical manufacture of paper product...

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Problems solved by technology

[0003] However, as a result of increasing paper machine speeds to improve the economical manufacture of paper products, new phenomena have emerged related to the operating capabilities of paper machines, and these phenomena also involve the appearance and internal structure of the paper products produced. Most of these changes are not caused by people. Desirable, for example, non-uniform distribution of debris and fillers on the surface or inside of paper products, thereby reducing acceptable retention or excellent retention, these variations and defects are extremely bad for paper products, and affect its ability to sell

[0004] In the international invention patent from Finland to China with the patent number CN100371528C, a method in the twin-wire forming area of ​​a paper machine or a board machine is disclosed, which uses a forming shoe or blade element on the forming area of ​​the paper machine , eliminate or reduce the above-mentioned defects and shortcomings to improve the output and the quality of paper products, but it cannot solve the impact of the air bubbles in the papermaking raw material slurry on the papermaking process, and the bubbles burst in the forming wire, resulting in local slurry vacancies , causing paper quality to suffer

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