阅读说明：本技术 一种湿帘纸损纸的处理方法 (Method for treating broken wet curtain paper ) 是由 周金涛 朱宏伟 史梦华 吴恒 何江林 李丹 于 2020-06-06 设计创作，主要内容包括：本发明公开了一种湿帘纸损纸的处理方法,属于造纸技术领域,包括以下步骤：步骤1：将生产中产生的存放24h以下的损纸和废纸均匀投入碎浆机中,加水,打开蒸汽阀门加热至80-85℃进行初步碎解得到浆料；步骤2：将经步骤1处理后得到的浆料送往贮浆池,泵送到盘磨机进行轻微疏解,直至浆料完全碎解；步骤3：将经步骤2处理后的浆料送至打浆机中,再加入非离子表面活性剂和阴离子表面活性剂；步骤4：将经步骤3处理后的浆料送湿帘纸生产系统回用,配用比例为12-20％；该方法不仅回收了制浆纤维,避免了纤维原料浪费,且不影响纸张质量指标,增强了湿帘纸的吸水性和抗霉变性。(The invention discloses a method for treating broken wet curtain paper, which belongs to the technical field of papermaking and comprises the following steps: step 1: uniformly putting broke and waste paper which are produced in production and stored for less than 24 hours into a pulper, adding water, opening a steam valve, heating to 80-85 ℃, and performing primary disintegration to obtain pulp; step 2: sending the pulp obtained after the treatment in the step 1 to a pulp storage pool, and pumping the pulp to a disc grinder for slight defibering until the pulp is completely disintegrated; and step 3: sending the pulp treated in the step 2 to a pulping machine, and adding a nonionic surfactant and an anionic surfactant; and 4, step 4: sending the pulp treated in the step 3 to a wet curtain paper production system for recycling, wherein the blending proportion is 12-20%; the method not only recovers pulping fibers, avoids the waste of fiber raw materials, but also does not influence the quality index of paper, and enhances the water absorption and the mildew resistance of wet curtain paper.)

1. A method for treating broken wet curtain paper is characterized by comprising the following steps:

step 1: uniformly putting broke and waste paper which are produced in production and stored for less than 24 hours into a pulper, adding water, opening a steam valve, heating to 80-85 ℃, and carrying out primary disintegration to obtain pulp, wherein the disintegration time is 2-2.5 hours, and the pulp concentration is 4-5%;

step 2: sending the pulp obtained after the treatment in the step 1 to a pulp storage pool, and pumping the pulp to a disc grinder for slight defibering until the pulp is completely disintegrated;

and step 3: sending the pulp treated in the step 2 to a pulping machine, adding a nonionic surfactant and an anionic surfactant, wherein the pulping concentration is 6-8%, and the pulping beating degree is 35-38 DEG SR;

and 4, step 4: and (3) delivering the pulp treated in the step (3) to a wet curtain paper production system for recycling, wherein the blending proportion is 12-20%.

2. The method for treating the wet curtain paper broke as claimed in claim 1, wherein the broke and the waste paper are paper breakage, rewinding and trimming broke and waste paper with unqualified quality generated in the production process of the wet curtain paper.

3. The method for treating wet curtain paper broke as claimed in claim 1, wherein the steam valve is opened in step 1, the wet curtain paper broke is heated to 82 ℃ for preliminary disintegration to obtain pulp, the disintegration time is 2.5h, and the pulp concentration is 4.3%.

4. The method for treating the wet curtain paper broke as claimed in claim 1, wherein the nonionic surfactant in the step 3 is nonylphenol polyoxyethylene ether; the anionic surfactant is a naphthenate.

5. The method for treating the wet curtain paper broke as claimed in claim 3, wherein the nonylphenol polyoxyethylene ether is added in an amount of 2-5% by mass based on the total mass of the pulp; the naphthenate accounts for 0.5-1.0% of the total mass of the slurry.

6. The method as claimed in claim 1, wherein the blending ratio in step 4 is 13%.

7. The method for treating wet curtain broke according to claim 1, wherein a hydroxyl containing compound is also added to the slurry before being sent to the system for reuse in step 4.

8. The method for treating the wet curtain paper broke as claimed in claim 6, wherein the compound containing hydroxyl is one or more of paeonol and hymexazol, and the mass ratio of the paeonol to the hymexazol is 0.5-0.8: 1 and mixing.

9. The method as claimed in claim 6, wherein the hydroxyl group-containing compound is added in an amount of 0.8-1.5% by weight based on the total weight of the pulp.

Technical Field

The invention belongs to the technical field of papermaking, and particularly relates to a method for treating broken wet curtain paper.

Background

The wet curtain paper for the interlayer of the water-cooling air conditioner has high requirement on wet strength, and a large amount of wet strength agent is added during production, so that broken paper and waste paper produced in the production process are not well treated, obvious paper scraps are produced on the paper surface, and the appearance and the use of the wet curtain paper are influenced. The original broke treatment is carried out by a calendaring paper shredder at normal temperature, the treatment time is long, a plurality of paper sheets which are not disintegrated are provided, the waste of fiber raw materials is caused, and after the paper sheets are recycled, the paper sheets also have paper scraps which have poor appearance and influence the processing and use.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a method for treating broken wet curtain paper, which not only recycles pulping fibers, avoids fiber raw material waste, but also does not influence paper quality indexes, and enhances the water absorption and mildew resistance of the wet curtain paper.

In order to realize the purpose, the invention adopts the technical scheme that:

a method for treating broken wet curtain paper comprises the following steps:

step 1: uniformly putting broke and waste paper which are produced in production and stored for less than 24 hours into a pulper, adding water, opening a steam valve, heating to 80-85 ℃, and carrying out primary disintegration to obtain pulp, wherein the disintegration time is 2-2.5 hours, and the pulp concentration is 4-5%;

step 2: sending the pulp obtained after the treatment in the step 1 to a pulp storage pool, and pumping the pulp to a disc grinder for slight defibering until the pulp is completely disintegrated;

and step 3: sending the pulp treated in the step 2 to a pulping machine, adding a nonionic surfactant and an anionic surfactant, wherein the pulping concentration is 6-8%, and the pulping beating degree is 35-38 DEG SR;

and 4, step 4: and (3) delivering the pulp treated in the step (3) to a wet curtain paper production system for recycling, wherein the blending proportion is 12-20%.

Further, the broke and the waste paper are respectively broken paper, rewinding trimming broke and waste paper with unqualified quality generated in the production process of the wet curtain paper.

Preferably, in the step 1, a steam valve is opened, the mixture is heated to 82 ℃ for preliminary disintegration, so that the pulp is obtained, the disintegration time is 2.5 hours, and the pulp concentration is 4.3%.

Further, the nonionic surfactant in the step 3 is nonylphenol polyoxyethylene ether; the anionic surfactant is a naphthenate.

Further, adding nonylphenol polyoxyethylene ether in an amount which is 2-5% of the total mass of the slurry; the naphthenate accounts for 0.5-1.0% of the total mass of the slurry.

Preferably, the blending ratio in the step 4 is 13%.

Further, a compound containing hydroxyl groups is also added to the slurry before being sent to the system for reuse in step 4.

Further, the compound containing hydroxyl is one or a mixture of more of paeonol and hymexazol, and the mass ratio of the paeonol to the hymexazol is 0.5-0.8: 1 and mixing.

Further, the added mass of the hydroxyl group-containing compound accounts for 0.8-1.5% of the total mass of the slurry.

The invention has the beneficial effects that: (1) the method controls the concentration of the pulp to be 4-5% in the primary disintegrating process, accurately measures the addition of the broken paper, the waste paper and the water, is beneficial to fully wetting the broken paper and the waste paper, has good fluidity, ensures good kneading effect among fibers, is beneficial to dispersion, and prevents the fibers from being cut off and damaged; a steam pipe is additionally arranged during pulping, the temperature is controlled to be 80-85 ℃, so that the pulping temperature is increased, and the breaking of broken paper and waste paper is accelerated;

(2) according to the invention, when pulp is pulped, nonylphenol polyoxyethylene ether and naphthenate are added to serve as a nonionic surfactant and an anionic surfactant, wherein the nonionic surfactant is used for dispersing stickies contained in broke and waste paper, the oleophylic group of the nonylphenol polyoxyethylene ether is combined with the stickies in the pulping process, the stickies are dispersed into smaller particles, then the smaller particles are attached to the surface of pulp fibers through the hydrophilic group at the other end of the nonylphenol polyoxyethylene ether, and the nonionic surfactant and the anionic surfactant are subjected to synergistic action to cause the adsorption of nonionic surface activity, the hydrophilic group chain extends to the pulp, so that the hydrophilicity of the whole pulp is improved, and the water absorption of wet curtain paper is enhanced in the recycling process;

(3) according to the invention, the compound containing hydroxyl is added before the pulp is sent to a wet curtain paper production system for reuse, wherein paeonol is added into the pulp containing the nonionic surfactant and is wrapped by hydrophilic groups, the water solubility is improved, the solubility in water is more than or equal to 9.5g/L, and the antibacterial property of the produced wet curtain paper is improved by adding the compound containing hydroxyl, so that the mildew resistance is enhanced, the wet curtain paper can be used for a long time without generating peculiar smell;

(4) the invention provides a method for treating broken wet curtain paper, which not only recovers pulping fibers, avoids waste of fiber raw materials, but also does not influence the quality index of paper, and enhances the water absorption and the mildew resistance of the wet curtain paper.

Detailed Description

For a better understanding of the present invention, embodiments of the present invention are described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.

The broke and the waste paper in the examples and the comparative examples of the present invention are paper breakage, rewinding and trimming broke and waste paper with unqualified quality, respectively, generated in the production process of wet curtain paper.