Exquisite kraft paper and producing method thereof

Abstract

The invention relates to a exquisite kraft paper and the preparation method, which is that: more than 60% masson pine, less than 15% Chinese fir and less than 40% hardwood are prepared, steamed and boiled, washed and screened, oxygen delignified and blesched, then is made into a sulfate micro-bleaching pulp, the whiteness of the pulp is 24-34%, the beating consistensy is 3.5-4.0%, the beating degree is 26-34 degree SR, and the wet weight is 10-15 g. after carried on beating, the kraft paper is made by that the pulp is carried on desanding, flavoring, the fine screening of a pressure screen, molding, pressing, drying, curling, rewinding and packing. The quantitative product is 40-120 g / M<2>, the broke resistance index is less than 1.7 Kpa.m<2> / g, the surface water absorption is 25-45 g / M<2>, the whiteness is 21.5-30%, the water content is 6-11%, the lead content (weighting as Pb) is less than or equal to 3 mg / kg, the arsenic content (weighting as As) is less than or equal to 0.8 mg / kg, the fluorescent substances are 254 nm and 365 nm, the decolorization test (water, n-hexane) shows negative, the coliform group content is less than or equal to 30 per 100 g, and the pathogenic bacteria content is 0.

Description

Technical field: [0001] The present invention relates to a kind of paper and its production method, especially relates to a kind of high-quality kraft paper and its production method. Background technique: [0002] Fine kraft paper is an updated product of ordinary kraft paper. In addition to the high strength of ordinary kraft paper, it also needs to have better appearance quality and certain printing performance to meet the needs of the growing paper packaging industry. In recent years, related research has emerged literature: [0003] Chinese Patent Application No. 93109932 discloses a refined kraft paper manufacturing process, which includes a pre-order process consisting of peeling, flaking, cooking, washing and slag removal, followed by beating, netting, pressing, light pressing, drying, calendering, The subsequent process of crimping and rewinding is characterized in that the moisture content is less than 35%, the cold water extract is less than 2.21%, the hot water ...

AI Technical Summary

Problems solved by technology

[0006] The scheme disclosed in Chinese Patent Application No. 93109932 uses larch as raw material, adopts hypochlorite bleaching, and has the disadvantage of producing organic chlorides that are not easy to biodegrade in the bleaching 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,

[0007] The refined kraft paper produced according to the above cannot meet the quality requirements of the relevant national departments for food packaging base paper, and its use is restricted to a certain extent

And the fiber raw materials used are relatively simple, and the cost is high