KR860001293B1 - Process for the manufacture of paper pulp from waster paper - Google Patents

Abstract

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Description

The way of the silence

1 is a process chart showing the deinking process of the present invention.

2 is a process chart showing a conventional deinking process.

The present invention relates to a deoiling method of waste paper which is deoxidized by Xerox Copy and other hard-to-desorb waste paper to be regenerated into high-quality pulp.

Conventionally, in the manufacture of paper by deoiling the waste paper and recycling the pulp, the use of 100% of the waste paper was not possible due to the decrease in the strength of the pulp during the deinking process, and 30-40% of the high quality pulp had to be mixed.

In the conventional deodorization method of the high paper, as shown in FIG. 2, the paper and water are put in a pulp, and 0.5% of a surfactant, 3% of caustic or sodium carbonate, and 3% of sodium silicate are added to foam. To separate contaminants, to protect the fibers while washing, to bleach with hydrogen peroxide in the chest, to remove primary coarse matter from the coarse screen, and to further entangle the tangled fibers in the deflaker. It dissociates finely, filters out smaller items contained in raw materials in the rough screen, removes various printing ink and carbon contents contained in the raw materials in the flotation cells, and fine screens. Filter small fines by passing through 0.1 ~ 0.15㎜ fine slots at, and lighter than fiber using Low Density Cleaner It would be to store the processed material is completed by washing off the printing ink or minute impurities such as carbon after removing the impurities remaining in raw material to a washer (Washer) to the machine chest (Machine Chest).

The pulp treated as described above was deficient in whiteness and not completely deinked in printing ink, and due to the decrease in the strength of the pulp, the use of 100% high paper was impossible. 30-40% of the high quality pulp had to be mixed.

The present invention is a deodorization method of a paper that can be produced by using a 100% paper to demux the Xerox Copy paper or other hard papers that are difficult to deink, and is attached thereto. When described in detail according to the process chart shown in the following.

The first process: water and high paper are added to the first pulper, and solvent (benzene, benzene, naphthalin chloride, cyclohexane, cyclohexanol, decalin, isoacetate, phenyl ether tetra) 0.5% of lean or toruline and another solvent (xylene, Diphenyl-Metahane, Diphenyl-ethyl, Diphenyl, dodecanol 1-C ₁₂ , octanol 1-C ₈ , tetralin C) ₄ using select one type from) by an input of 0.5% and then, 3-5% sodium silicate, 3% sodium hydroxide or carbonate, sodium and polyethylene geurayi call, glacial acetic acid, formalin, EDTA, DTPA, CMC, CMS, such as a small amount Dissolve the highland at a constant concentration by input.

At this time, polyethylene glycol is an antistatic and stabilizer between the dispersant and the fiber, and the solvent penetrates evenly between the paper fibers and dissolves the pigment or the adhesive of the ink powder which is difficult to dissolve with the surfactant. It does not break the fibers, so the ink particles are removed from the fibers so that they do not break, and formalin helps glacial acetic acid to soften the keratinization of the fibers, and because it is a regenerated fiber, it kills bacteria between the fibers that are likely to occur in summer or rainy season. .

In addition, EDTA and DTPA promote the separation of ink as a dispersant, CMC and CMS are hydrophilic substances with hydrophilic groups, which prevent the sticking of fibers once they are removed again, and sodium silicate protects the fibers and protects the fibers. By doing so, the notice is well dissociated.

Second step: Deinking the ink not deinking in the first step by adding the same chemicals as the first paper and the dissociated paper in the first step into the second pulper,

3rd process: 3% of paper and surfactant demelted in 2nd process in third pulper, 3 ~ 5% of sodium silicate, 3% of sodium hydroxide or sodium carbonate, polyethylene glycol, glacial acetic acid, formalin EDTA, DTPA Dissolve the highland in a constant concentration by adding small amounts of CMC, CMS, etc.

At this time, the surfactant, caustic soda or sodium carbonate separates various contaminants from the fiber, such as when not deinking in the second step, and generates bubbles.

4th process: The raw material dissociated in the 1st-3rd process is temporarily stored in the chest,

5th process: Pass rough course to remove rough goods,

6th step: Concentrate the raw material in high concentration up to 25% with thickener,

The 7th process: It is a steam mixer (Steam Mixer) to increase the temperature by mixing steam and raw materials to activate the action of various chemicals injected from the pulper,

8th process: Aging raw materials and chemicals at elevated temperature in Soaking Towe for a certain time,

Ninth step: through a 0.45mm slot in a rough screen to filter out smaller items contained in the raw material,

10th step: remove the printing ink and carbon contained in the raw material in the flotation cells

Step 11: Squeeze the first dirty water from the raw material with a Velveless Filter,

12th process: Filter fine particles by passing a fine slot (0.1 ~ 0.15㎜) in the fine screen (Fine Screen),

Process 13: removes lighter than the fiber in the low density cleaner (Low Density Cleaner),

Step 14: Wash and remove impurities such as printing ink powder or carbon powder remaining in the raw material with a washer,

Process 15: Reconcentrate the raw material to high concentration with thickener,

Step 16: Add white acid by adding H ₂ SO ₄ and Na ₂ SO ₃ in an acidification mixer to further improve whiteness,

Step 17: Sodium Hydrosulfite (Na ₂ S ₂ O ₄ ) was added in a Mixer,

Process 18: Bleaching Tower (Bleaching Tower) to further increase the whiteness,

Process 19: Regenerated fiber by introducing into the machine chest (Methyl alcohol) (CH ₃ OH), sodium silicate (Na ₂ SiO ₃ ), white carbon (polycarbonate), and a small amount of polyvinyl alcohol Because of this, the bulgeness, stiffness and printability strength, which are reduced, are compensated for and stored and then transferred to the papermaking process.

In the deinking method of the present invention as described above, by using two to four pulpers, the swelling time of the fibers in the alkaline solution is extended, and the old paper, which was previously difficult to degreaser, such as Xerox copied paper, is the same as the original pulp. It is possible to manufacture a paper that can be used as newspaper paper or pulp paper by using 100% of the recycled pulp treated by the present invention by deinking to have a whiteness.

Claims (2)

Solvent (benzene, first naphthalin, cyclohexane, cyclohexanol, decalin, isoacetate, phenyl ether tetralin, tolu Use one type of lean) 0.5% and another type of solvent (xylene, Diphenyl-Metahane, Diphonyl-ethyl, Diphenyl, dodecanol 1-C ₁₂ , octanol 1-C ₈ , tetralin C ₄₎ 0.5% is added, and then 3 ~ 5% of sodium silicate, 3% of sodium hydroxide or sodium carbonate, polyethylene glycol, glacial acetic acid, formalin, EDTA, DTPA, CMC, CMS, etc. Dissociated to a concentration, 0.5% of the paper and surfactant degreased in the second step in the third step, 3-5% of sodium silicate, 3% of sodium hydroxide or sodium carbonate, and polyethylene glycol, glacial acetic acid, formalin, EDTA , DTPA, CMC, CMS, etc. Methyl alcohol (CH ₃ OH), sodium silicate (Na ₂ SiO _3), white carbon (White Carbon) to that following, the fourth process to notice is passed through a 18 step dissociation at a constant concentration in the machine chest of claim 19, step a And, by adding a small amount of polyvinyl alcohol and the like as recycled fibers, supplemented with bulkyness, stiffness and printability strength, which are reduced, and stored and transported to a papermaking process. Deinking method. The deoiling method of used paper according to claim 1, wherein solvent is used in the first pulper and the second pulper of the first step and the second step, and desolvation of the used paper is carried out using a surfactant in the third pulper of the third step.

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