Papermaking tobacco sheet pulp grinding process

Abstract

The invention discloses a papermaking tobacco sheet pulp grinding process. Specifically speaking, under the light beating condition, three-stage light beating flexible pulp grinding is adopted, each stage needs at least two pulp grinding machines, pulp concentration is decreased gradually, and size circulation process is controlled. In prepared size, fibers with the length of 0.5-1.25mm reach more than 63%, bulk degrees of base tabs reach 2.8-3.0cm <3> / g, spreading rates, filling values, burning velocity of finished sheets are improved greatly, tar contents and carbon oxide contents are reduced greatly, and the bulk degrees of the finished sheets reach 2.3-2.5cm<3> / g. The number of pulp grinding machines arranged in the first stage, the second stage and the third stage in a serial connection mode is respectively 4, 3 and 2. The pulp grinding concentration in the first stage, the second stage and the third stage are respectively set to be 4.5-5.0%, 4.0-4.5% and 2.0-2.5%. Times of self-circulation of the size in the first stage, the second stage and the third stage are respectively 1-3 times, 1-2 times and 1-2 times. The times for which mixed size prepared in different components passes through the pulp grinding machines in the whole process are 9-22 times actually, and all nine pulp grinding machines allow constant power regulation independently.

Description

technical field [0001] The invention relates to a paper-making tobacco flake refining process, in particular to preparing tobacco flake pulp by adopting a multi-stage flexible low-concentration refining process under the condition of light knife defrosting, and belongs to the technical field of reconstituted tobacco leaf production in the cigarette industry. Background technique [0002] Tobacco flakes (also known as reconstituted tobacco leaves) by wet papermaking method are mixed with tobacco pulp made of waste materials such as tobacco stems, shredded tobacco leaves and tobacco powder, etc., mixed with a certain amount of wood pulp and fillers, and then made into substrate sheets by paper machine and then dip-coated. Tobacco fiber is made of cotton cloth. Since tobacco fiber is similar to low-grade straw pulp fiber, it is not a good raw material for papermaking fiber. From the composition of tobacco fiber material, it can be seen that its lignin content is low, and the mai...

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Problems solved by technology

Its shortcomings are: (1) In the prepared pulp, the short fiber content of 0.20-0.50 mm is 35.6%, which is relatively high; (2) The content of medium fibers of 0.5-1.25 mm is less than 60%, and this level of refining is still a A medium grade; (3) The bulk thickness of the substrate produced by this process is ≤2.6cm 3 / g, relatively low; (4) In the two-stage refining in the process, each stage uses a disc refiner to cycle repeatedly, and the production efficiency is low; (5) When using a single disc refiner and single-stage refining conditions, all In the same situation, it is difficult to adjust

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