Kraft paper and making method thereof

A manufacturing method and technology for kraft paper, applied in the field of pulp and paper making, can solve the problems of poor paper quality, insufficient hardness of ordinary kraft paper, unstable and uniform slurry, etc., and achieve the effects of easy operation, easy industrial production, and strong flocculation ability.

Inactive Publication Date: 2013-12-25
句容市植保植检站
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The hardness of ordinary kraft paper is not strong enough. In addition, in the preparation process of kraft paper, in order to obtain b

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of manufacture method of kraft paper, comprises the following steps:

[0025] 1) Pretreatment of wood fibers;

[0026] 2) Add sodium hydroxide and sodium sulfide to the black liquor remaining in step 1) for the second cooking to obtain slurry;

[0027] 3) Bleaching the slurry prepared in step 2);

[0028] 4) Add sizing materials, dyes, paper retention and drainage aids and perform enhanced evolutionary screening to remove impurities;

[0029] 5) The pulp is mixed with American waste and made into paper in a paper machine.

[0030] The pretreatment of the wood fiber comprises the following steps: placing the wood fiber in an impregnation screw machine after dry treatment, adding sulfurized soda or caustic soda to the screw machine to obtain an impregnation solution, and the alkali content in the impregnation solution is 40g / l , after rotating in the dipping screw machine for 30 minutes, transfer to steaming balls and cook for 50 minutes at 100° C., the rotating...

Embodiment 2

[0038] A kind of manufacture method of kraft paper, comprises the following steps:

[0039] 1) Pretreatment of wood fibers;

[0040] 2) Add sodium hydroxide and sodium sulfide to the black liquor remaining in step 1) for the second cooking to obtain slurry;

[0041] 3) Bleaching the slurry prepared in step 2);

[0042] 4) Add sizing materials, dyes, paper retention and drainage aids and perform enhanced evolutionary screening to remove impurities;

[0043] 5) The pulp is mixed with American waste and made into paper in a paper machine.

[0044] The pretreatment of the wood fiber comprises the following steps: placing the wood fiber in an impregnation screw machine after dry treatment, adding sulfurized soda or caustic soda to the screw machine to obtain an impregnation solution, and the alkali content in the impregnation solution is 40g / l , after rotating in the dipping screw machine for 30 minutes, transfer to steaming balls and cook for 50 minutes at 120° C., the rotating...

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PUM

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Abstract

The invention discloses a making method of kraft paper. The making method comprises the following steps: 1) pre-treating wood fibers; 2) adding sodium hydroxide and sodium sulfide in residual black liquor from the step 1) and performing secondary digestion to obtain a pulp material; 3) bleaching the pulp material obtained from the step 2); 4) adding a sizing material, a dye and a paper making retention and drainage agent, and performing reinforced evolution screening to remove impurities; and 5) mixing pulp with America waste paper and making the mixed pulp into paper in a paper making machine. The adopted bleaching technology allows paper whiteness to meet paper requirements, but does not reduce the mechanical strength of paper, and meanwhile the paper is not yellowed easily and is stable in quality. A Sirain paper making retention and drainage agent with high branch chain density adopted in the method has a flocculation capability more powerful than that of linear molecules and especially has an extremely strong retention capability for fine fibers. High strong positive charge density is also helpful to retain more filler. The method is simple in preparation technology and easy to operate and for industrial production.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to kraft paper and a manufacturing method thereof. Background technique [0002] Kraft paper (kraftpaper), used as packaging material. The intensity is high. Usually yellowish brown. Semi-bleached or fully bleached kraft pulp is light brown, cream or white. Quantitative 80~120g / m 2 . The fracture length is generally above 6000m. Tear strength, work of rupture and dynamic strength are high. Mostly roll paper, but also flat paper. Using kraft softwood pulp as raw material, after beating, it is made on fourdrinier paper machine. It can be used as cement bag paper, envelope paper, glue-sealing paper, asphalt paper, cable protection paper, insulating paper, etc. [0003] The hardness of ordinary kraft paper is not strong enough. In addition, in the preparation process of kraft paper, in order to obtain better whiteness, the mechanical strength of paper is reduced. The qua...

Claims

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Application Information

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IPC IPC(8): D21H27/10D21C5/00D21C9/10
Inventor 陈海波梁明华
Owner 句容市植保植检站
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