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Mixed pulp with high bulk, air permeability and tear index and cultural paper made thereof

A technology of cultural paper and tear index, applied in textiles and papermaking, natural cellulose pulp/paper, papermaking, etc., can solve the problems of short fibers, poor tear strength of straw pulp, and low tear strength

Active Publication Date: 2012-07-04
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 "Reevaluation of Straw Papermaking" ("Shanghai Paper" 1974, No. 5, p38), straw pulp can be compared with hardwood pulp, because the fiber Both are short, so the tear strength is low, which limits the application of straw pulp

Method used

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  • Mixed pulp with high bulk, air permeability and tear index and cultural paper made thereof
  • Mixed pulp with high bulk, air permeability and tear index and cultural paper made thereof
  • Mixed pulp with high bulk, air permeability and tear index and cultural paper made thereof

Examples

Experimental program
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Effect test

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.

Embodiment 7

[0189] Example 7 is through oxygen delignification, and the oxygen delignification process also refers to any oxygen delignification method in the prior art.

[0190] 2. Examples 9-15 are examples using the caustic soda method. Grass and other straw materials are prepared, pretreated, cooked, and then squeezed and washed to obtain the high air permeability straw pulp or unbleached straw pulp.

[0191] Table 2, caustic soda method

[0192]

[0193] 3. Examples 16-22 are examples of preparing unbleached grass pulp by using the caustic soda-AQ method. Grass and other straw materials are prepared, pretreated, cooked, and then squeezed and washed to obtain the high air permeability grass pulp. pulp or unbleached grass pulp.

[0194] Table 3. Caustic soda-AQ method

[0195]

[0196] 4. In Examples 23-28, unbleached straw pulp was prepared by the alkaline sodium nitrite-AQ method, wherein the properties of the unbleached straw pulp were measured by conventional methods on the...

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Abstract

The invention relates to mixed pulp with high bulk, air permeability and tear index and cultural paper made thereof. The air permeability of the novel straw pulp is 300-6500ml / min, the bulk is 2-3cm<3> / g and the tear index is 3.5-6mN.m<2> / g. Preferably, the air permeability is 500-5500ml / min, the bulk is 2.3-2.8cm<3> / g and the tear index is 4.6-5.6mN.m<2> / g. More preferably, the air permeability is 1000-5000ml / min, the bulk is 2.4-2.6cm<3> / g and the tear index is 4.8-5.4mN.m<2> / g. Since the bulk, the tear index and the air permeability of the mixed pulp provided by the invention are high, thebulk and the opacity of the paper made of the mixed pulp are improved, the stiffness and the like of the paper are increased, and the papermaking speed is greatly improved because the air permeability is improved.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a high bulk, 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 burn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/00D21C3/02
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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