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High-gram-weight regenerated craft paper and preparation method thereof

A kraft cardboard, weight percentage technology, applied in the field of papermaking, can solve problems such as difficulties in regenerating kraft cardboard, many times of recycling, and short fibers

Active Publication Date: 2021-10-22
LIANSHENG PAPER IND LONGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with American waste and European waste, domestic waste has the characteristics of short fibers, many times of recycling, and low strength.
Under the pressure of the shortage of raw materials and the market pressure of poor quality and rising prices of domestic waste, the use of the original technology can no longer meet the current raw material conditions, which brings great difficulties to the production of high-performance recycled kraft linerboard.

Method used

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  • High-gram-weight regenerated craft paper and preparation method thereof
  • High-gram-weight regenerated craft paper and preparation method thereof
  • High-gram-weight regenerated craft paper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] A kind of preparation method of high grammage regenerated kraft cardboard described in the second aspect of the present invention, it comprises the following steps:

[0042] S10, preparation of national waste OCC pulp:

[0043] S101: After feeding, shredding, high-concentration slag removal, and coarse screening, the domestic OCC waste paper with a formula amount is subjected to fiber classification and sorting into national waste OCC long fiber, national waste OCC medium fiber and national waste OCC short fiber;

[0044] S102: After the national waste OCC long fiber is subjected to heavy deslagging, fine screening, light deslagging, multi-disk concentration, heat dispersion, and fine pulping, the national waste OCC long fiber pulp is obtained, and sent to the mixing pulp tank for blending pulp;

[0045] S103: After the national waste OCC medium fiber is subjected to heavy slag removal, light slag removal, multi-disc concentration, and heat dispersion, the national was...

Embodiment 1

[0077] Example 1 Slice Test of American Waste, European Waste and National Waste Raw Materials

[0078] In this example, the raw materials of American waste, European waste and domestic waste are crushed, slag removed, screened and purified, and then concentrated into a slurry, the slurry is decomposed to uniformity, and then the slices are tested separately, and the quantification of the slices is 100g / cm 2 , the test results are the average value after three determinations. The test results are shown in Table 1.

[0079] Table 1 The results of the copying test of American waste, European waste and national waste

[0080]

[0081] It can be seen from Table 1 that American waste fiber has good length and high fiber strength, and American waste OCC raw material sheets have high bursting strength and folding resistance; European waste is second in all aspects of performance; while domestic waste OCC raw material sheets The average length is low, the fiber bonding force is...

Embodiment 2

[0083] The sheet test of embodiment 2 wood pulp

[0084] In this embodiment, unbleached kraft softwood pulp (unbleached softwood pulp), unbleached kraft broadleaf pulp (unbleached eucalyptus pulp), reel recycled pulp (reel substitute wood pulp, fiber content is 100%) Chemical pulp) was crushed, slag removed, disc-milled and beaten into a slurry, and then the sheet test was carried out respectively, and the test results were shown in Table 2; at the same time, different wood pulps were carried out in the proportion sheet test, and the test results were shown in Table 3. Show. The test results are averaged after three determinations.

[0085] Sheet test results of table 2 wood pulp

[0086]

[0087] It can be seen from Table 2 that the unbleached kraft softwood pulp has the best burst index and folding strength. Although the bursting index and folding strength of unbleached eucalyptus pulp and reel wood pulp are lower than those of unbleached coniferous wood pulp, they are...

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Abstract

The invention relates to a regenerated craft paper. The regenerated craft paper comprises a surface layer, a core layer and a bottom layer, wherein the regenerated craft paper is prepared from the following pulp in percentage by weight: 80-90% of national waste OCC pulp in China and 10-20% of wood pulp, wherein the raw material of the national waste OCC pulp in China is domestic OCC waste paper, and the domestic OCC waste paper comprises 70%-80% of national waste A-grade paper and 20%-30% of national waste BC-grade paper; the wood pulp comprises one or a mixture of more than one selected from unbleached softwood pulp, unbleached eucalyptus pulp and rolled wood pulp in any ratio; and the basis weight of the regenerated craft paper is 95-210 g / cm<2>. The invention also relates to a preparation method of the regenerated craft paper. According to the preparation method, American waste OCC and European waste OCC are not used, national waste OCC in China is used as a main raw material; and the craft paper with the basis weight of 95-210 g / cm<2> can be produced by optimizing a wood pulp ratio, and the craft paper is tough and stable in quality, so the problem of difficulty in production of the craft paper with the basis weight of 95-210 g / cm<2> and with the same quality by using the national waste OCC in China as a material after import waste paper is prohibited in China is overcome.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a high grammage recycled kraft cardboard and a preparation method thereof. Background technique [0002] Recycled kraftboard is generally made of all waste paper or the main raw material is waste paper pulping and remanufacturing. Its raw material cost and production energy consumption are relatively low, and it has very obvious advantages in the field of packaging paper. [0003] The sources of waste paper mainly include domestic waste paper and imported waste paper. With the deepening of the implementation of the national environmental protection policy, the country has begun to completely ban the import of waste paper, and domestic waste paper will undoubtedly become the main raw material for papermaking from waste paper. However, compared with American waste and European waste, domestic waste has the characteristics of short fibers, many times of recycling, and low stren...

Claims

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Application Information

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IPC IPC(8): D21H27/10D21H11/14D21H11/08D21C5/02D21F11/00
CPCD21H27/10D21H11/14D21H11/08D21C5/02D21F11/00Y02W30/64
Inventor 陈光军张永春朱琦李全勇王才林卢奇遇袁福玉张维连吴建敏熊俊华
Owner LIANSHENG PAPER IND LONGHAI
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