Mixed pulp with high opacity, air permeability and tearing index and cultural paper prepared from the same

A technology of tear index, cultural paper, applied in the field of papermaking, can solve the problems of low tear strength, poor straw pulp tear strength, short fiber and so on

Active Publication Date: 2010-06-30
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This severely limits the improvement of production efficiency and increases the production cost
[0010] In addition, the tear strength of straw pulp is also worse than that of wood pulp. As mentioned in "Reevalua...

Method used

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  • Mixed pulp with high opacity, air permeability and tearing index and cultural paper prepared from the same
  • Mixed pulp with high opacity, air permeability and tearing index and cultural paper prepared from the same
  • Mixed pulp with high opacity, air permeability and tearing index and cultural paper prepared from the same

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preparation example Construction

[0183] 1. Preparation of unbleached straw pulp

[0184] 1. Examples 1-8 are examples of unbleached straw pulp prepared by the sulfate method. Grass and other straw raw materials are prepared, pretreated, cooked, and then squeezed and washed to obtain the high air permeability straw pulp Or unbleached grass pulp.

[0185] Table 1. Sulfate method

[0186]

[0187] The unit of bulk thickness in the table is cm 3 / g, air permeability unit ml / min, breaking length unit Km, folding endurance unit N.m / g, tear degree unit mN, tear index unit mN.m 2 / g. The table below is the same.

[0188] Wherein the straw pulp embodiment 1 is bleached by adding 1 / 8 amount of hydrogen peroxide in the prior art, and the bleaching process refers to any hydrogen peroxide bleaching process in the prior art. Example 7 is through oxygen delignification, and the oxygen delignification process also refers to any oxygen delignification method in the prior art.

[0189] 2. Examples 9-15 are examples us...

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Abstract

The invention relates to mixed pulp with high opacity, air permeability and tearing index and paper with the mixed pulp. The air permeability of the high-efficient straw pulp is between 300 and 6500 ml/min, the opacity is between 88 to 100 percent, and the tearing index is between 3.5 and 6 mN*m<2>/g; preferably, the air permeability is between 500 and 5500 ml/min, the opacity is between 90 and 99 percent, and the tearing index is between 4.6 and 5.6 mN*m<2>/g; more preferably, the air permeability is between 1000 and 5000 ml/min, the opacity is between 94 and 98 percent, and the tearing index is between 4.8 and 5.4 mN*m<2>/g. The mixed pulp provided by the invention has high opacity, air permeability and tearing index, so the opacity of the paper with the mixed pulp is improved, and the stiffness and the like of the paper are improved. Because of the improvement of the air permeability, the papermaking speed is greatly improved.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a high opacity, air permeability and tear index mixed pulp and cultural paper prepared therefrom. Background technique [0002] The shortage of raw materials is one of the three major problems faced by the world's paper industry, and this problem is particularly prominent in my country's paper industry. The development of non-wood fiber raw materials for pulping and papermaking is one of the effective ways for my country's paper industry to solve the shortage of raw materials and reduce environmental pollution. [0003] However, at the same time, China faces the problem of straw disposal every year. China is a large planting country of grass crops such as wheat and rice, and a large amount of straw is produced every harvest season. At present, most people burn straw and put it into the river to reduce the pressure of a large amount of straw piles. [0004] The harm caused by straw b...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21H11/00D21C3/02D21H27/00
Inventor 李洪法宋明信王建民毕衍金徐金香
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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