Colored kraft paper and production method thereof

Abstract

The invention discloses colored kraft paper and a production method thereof. The production method comprises the following steps: pulping waste paper, screening, purifying, floating, concentrating, dewatering, carrying out heat dispersion, and bleaching to obtain waste paper deinked pulp; mixing the waste paper deinked pulp with beaten commercial softwood pulp; and desanding, blending (including color mixing), screening, purifying, carrying out net shaping, squeezing, drying, calendering, winding, rewinding, and packing, wherein the absolute dry mass ratio of the waste paper deinked pulp to the commercial softwood pulp is 70-80%:20-30%. The colored kraft paper produced by the method has high physical strength, low production cost and good tissue evenness, the color of the paper can be adjusted in accordance with user preferences by adding dyes, and the appearance quality is obviously improved; as the used waste paper pulp is subjected to TCF (Total Chlorine Free) bleaching in the pulping process, organic halides (AOX) and dioxin which are difficult to biodegrade can not be produced in the production process, thereby having the advantage of realizing clean production; and 70% of regenerated fibers are used to reduce the consumption of virgin fibers, thereby saving wood and being environment friendly.

Description

technical field [0001] The invention relates to a paper and its production method, in particular to a color kraft paper produced by using waste paper deinked pulp and coniferous wood pulp as fiber raw materials and its production method. Background technique [0002] Colored kraft paper is special paper. In addition to the high strength, good appearance quality and certain printing performance of high-quality kraft paper and ordinary kraft paper to meet the needs of the growing paper packaging industry, it also needs specific colors to meet customers' pursuit of beauty. . The research literature on kraft paper that has appeared in recent years is as follows: [0003] Chinese patent application No. 931009932 discloses a process for manufacturing refined kraft paper, including the preceding process consisting of peeling, chipping, cooking, washing and slag removal, followed by beating, netting, pressing, light pressing, drying, calendering, and curling. And the subsequent pr...

AI Technical Summary

Problems solved by technology

[0007] The scheme disclosed in Chinese Patent Application No. 93109932 uses larch as raw material, adopts hypochlorite bleaching, produces organic chlorides that are not easy to biodegrade during the existence process, and pollutes the environment. The scheme of Chinese Patent Application No. 98106862 uses 100% Russian bleached softwood pulp is used as raw material, which has the disadvantages of high production cost and high dependence on foreign countries; Chinese patent application number 200610047147 proposes a method for producing refined kraft paper using American waste paper, and its waste paper pulping process is very backward and unscientific

Chinese patent application number 200810093391 proposes to use masson pine, fir and hardwood as raw materials, all of which are virgin fibers, which is not conducive to environmental protection, and the product color is single

[0008] The refined kraft paper produced according to the above cannot meet the quality requirements of relevant national departments on food packaging and the special requirements of users for color, and its use is restricted to a certain extent.

Moreover, the raw material is single or all virgin fibers are used, which cannot achieve resource saving and environmental friendliness, and the product color is relatively single and the cost is high