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Method for manufacturing unbleached paper

A manufacturing method and technology of uncolored paper, applied in pulp beating method, non-woody plant/crop pulp, pulping with inorganic alkali, etc., can solve the problems of excessive white color, stains, dust falling off, etc., and achieve the improvement of cellulose Content, the effect of improving appearance characteristics

Inactive Publication Date: 2016-07-20
ANHUI GEYI CYCLIC ECONOMY IND PARK
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AI Technical Summary

Problems solved by technology

In addition, in order to improve the hand feel, talcum powder is added to make it too slippery or dust often falls off during use
In addition, over-bleaching is performed to increase whiteness, making the color excessively white or stained
However, these methods cannot fundamentally solve the problems especially caused by herbal raw materials

Method used

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  • Method for manufacturing unbleached paper
  • Method for manufacturing unbleached paper
  • Method for manufacturing unbleached paper

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Embodiment

[0055] 50 tons of wheat straw is used as raw material, and the raw material is pretreated by dust removal, cutting and crushing, and then sent to the cooking tank through the conveying equipment, and steamed with about 2.0MPa steam for about 5 minutes, after cooking, multi-stage cleaning with water is carried out, and passed Precipitation is used for solid-liquid separation, the upper liquid containing hemicellulose is separated, and the solid content of the lower layer after cooking is recovered.

[0056] Next, add 4% to 10% sodium hydroxide aqueous solution to the obtained cooked solid content, cook at about 100°C for about 1 hour, precipitate after cooking, and recover the lower solid, which is cellulose product.

[0057] After analysis, the cellulose product obtained above is about 13 tons, and its various indicators are: concentration 28.63%, K value 5.32, percussion degree 26.5°SR, wet weight 2.93g, whiteness 44.13°, pH value 8.07.

[0058] Using the above-mentioned cel...

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Abstract

The invention provides a method for manufacturing environment-friendly unbleached paper. The method comprises a pulp preparing step, a pulp kneading step and a pulping step. In the pulp preparing step, a cellulose product obtained through carrying out three-pigment separation on herbaceous plant materials serves as a raw material. The cellulose product has the properties as follows: based on the total weight of the cellulose product, the concentration of cellulose is 28.63%, the K-factor is smaller than 5.5, the beating degree is 20 to 30 degrees SR, the wet weight is 2g to 3.5g, the whiteness is smaller than 44.5 degrees, and the pH value is 7 to 9. The environment-friendly unbleached paper manufactured by the method has higher cellulose content and has more excellent appearance characteristics compared with similar products. In addition, the paper manufactured by the method has no chemical preparations and is not subjected to bleaching treatment, so that the paper is free of residual and is harmless to human when in use.

Description

technical field [0001] The invention relates to the field of high-efficiency and comprehensive utilization of biomass resources, in particular to a method for manufacturing environment-friendly natural color paper from cellulose products obtained by separating three elements. Background technique [0002] The raw material for papermaking is mainly plant fibers. In economically developed countries, coniferous or broad-leaved wood is mainly used, accounting for more than 95% of the total consumption. There are relatively many types of plant fiber raw materials used in China, including (1) coniferous wood, such as larch, red pine, masson pine, Yunnan pine, sylvestris pine, etc.; (2) broad-leaved tree wood, such as poplar and birch (3) Herbaceous plants, such as reed, bamboo, miscanthus, wheat straw, straw, asparagus, sorghum stalk, bagasse, etc.; (4) Bast fibers, such as flax, jute, kenaf, sandalwood Bark, mulberry bark, cotton stalk bark, etc.; (5) Wool fibers, such as cotto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C1/02D21C3/02D21D1/02D21H11/12C08B37/14
CPCD21C1/02C08B37/14D21C3/02D21D1/02D21H11/12
Inventor 邹海平刘志刚梅虎王涛
Owner ANHUI GEYI CYCLIC ECONOMY IND PARK
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