KR930003370B1 - Process for kraft paper - Google Patents

Process for kraft paper Download PDF

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KR930003370B1
KR930003370B1 KR1019900004793A KR900004793A KR930003370B1 KR 930003370 B1 KR930003370 B1 KR 930003370B1 KR 1019900004793 A KR1019900004793 A KR 1019900004793A KR 900004793 A KR900004793 A KR 900004793A KR 930003370 B1 KR930003370 B1 KR 930003370B1
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fiber
paper
line
machine
kraft paper
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KR1019900004793A
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Korean (ko)
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KR910018631A (en
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이순국
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온양펄프 주식회사
김우식
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02Working-up waste paper
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/64Paper recycling

Abstract

The process comprises a series of waste-paper treatment process using: a fiber sorting machine in which the portion of short fibers is removed, and the portion of long fibers is transferred to concentration machine and fiber curling machine; concentration machine; a fiber curling machine, the concentration of raw materials of paper at the inlet of which being controlled to 28-34 %, and the temperature of raw materials of paper at the outlet of which being controlled to 85-95 deg.C so that the formulation ratio of waste paper increases by 60-80 %, and a tower.

Description

크라프트종이(kraft paper) 제조시 고지활용을 증대시키는 공정Process to increase high paper utilization in kraft paper production

도면은 원료라인 1에서 버진펄프가 처리되어 라인 7이나 라인 8로 진행되고, 라인 9에선 고지가 처리되어 섬유분류기(14)에서 단섬유부를 제거하고, 농축기(18)에서 또는 정선장치(27)에서 버진펄프(virgin pulp)와 혼합되어 제조되는 간략화된 공정 유출도.The figure shows that the virgin pulp is processed in raw material line 1 and proceeds to line 7 or line 8, and the waste paper is processed in line 9 to remove short fibers in the fiber sorter 14, and in the concentrator 18 or in the selection apparatus 27. Simplified process runoff prepared by mixing with virgin pulp at.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

6,25 : 고해기 14 : 섬유분류기6,25: confessional 14: fiber sorter

12,27 : 정선장치 18 : 농축기12,27: Selection device 18: Thickener

21 : 섬유커링기 23 : 타워21: fiber curling machine 23: tower

본 발명은 버진펄프(virgin pulp)와 박스 고지를 사용하여 크라프트종이 제조시, 박스 고지의 배합비를 증가시키는 공정에 관한 것이다. 보통 크라프트종이를 제조하는 공정은 최대 고지활용율이 50% 이하이다. 그 이유는 고지중의 섬유는 자체강도가 버진펄프에 비하여 많이 떨어지고, 1회 이상의 고해작업을 받아 많은 단섬유가 존재하게 되기 때문이다.The present invention relates to a process for increasing the mixing ratio of box paper when kraft paper is manufactured using virgin pulp and box paper. Usually, the process for producing kraft paper has a maximum high paper utilization of 50% or less. The reason is that the fiber in the high paper is much lower in strength than the virgin pulp, and many short fibers are present after one or more beatings.

따라서 종래의 크라프트종이 제조 공정을 이용한 최종제품이 크라프트종이의 강도에 대한 KS 규격인 KSM 7501과 소비자가 원하는 색상때문에 고지 활용도를 50% 이하로 사용할 수 밖에 없었다. 그러나 본 발명에서는 강도 및 색상에 대한 문제를 해결함과 동시에 원가절감을 높이기 위한 고지활용을 80%까지 재고시키는 새로운 공정을 개발하여 고지의 배합비를 증대시킬 수 있었다.Therefore, the final product using the conventional kraft paper manufacturing process was forced to use the high paper utilization of less than 50% because of KSM 7501, the KS standard for the strength of kraft paper, and the color desired by the consumer. However, the present invention was able to increase the mixing ratio of the waste paper by developing a new process for resolving the problem of strength and color, and at the same time to reclaim the use of waste paper up to 80% to increase cost reduction.

우선 본 발명의 흐름도를 간략히 설명하면, 첫째 섬유분류기(14)로 박스 고지중에 함유하고 있는 단섬유부를 제거하고, 둘째 섬유분류기(14)에서 회수되는 장섬유부를 섬유커링(curling)기(21)(섬유를 접히고 주름지게 하는 장치)와 적절한 약품(20)을 이용하여 섬유 자체 강도를 향상시키고, 셋째 고지의 배합비율을 증가시키므로써 야기되는 색상도 적정량의 약품(20)을 투입하고, 타워(23)에서 자료를 숙성시키는 공정이다.First, the flow chart of the present invention will be briefly described. First, the fiber sorter 14 removes the short fiber part contained in the box paper, and the second fiber sorter 14 recovers the long fiber part recovered from the fiber sorter 14. (The device that folds and wrinkles the fibers) and the appropriate chemicals 20 to improve the strength of the fibers themselves, and increase the compounding ratio of the third paper, the amount of color caused by adding the appropriate amount of the chemicals 20, tower (23) is the process of ripening data.

이하 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

버진펄프 라인중 라인 8로 처리되는 흐름도는 기존의 크라프트종이 제조 라인과 동일하나 라인 7로 처리되는 흐름도는 고지와 함께 섬유커링기(21)를 통과하므로 고해기(6)의 작업조건이 중요하다. 라인 7에서 버진펄프의 적정 고해도는 라인 15에서의 고지 고해도 보다 어느 정도 높아야 하며, 이는 버진펄프와 박스고지의 배합비에 영향을 받는다.The flow chart processed by line 8 of the virgin pulp line is the same as the existing kraft paper production line, but the flow chart processed by line 7 passes through the fiber curler 21 with the notice, so the working condition of the blast furnace 6 is important. . The optimum altitude of virgin pulp in line 7 should be somewhat higher than the altitude of altitude in line 15, which is affected by the blending ratio of virgin pulp and box waste.

고지라인은 본 발명에서 특히 중요하며 강력한 정선장치가 필요하다. 정선장치(12)는 고지중에 함유하고 있는 많은 불순물을 충분히 처리할 수 있는 장치여야 하며, 특히 왁스등의 경 불순물을 충분히 제거시켜야 한다. 그리고 섬유분류기(14)는 박스고지의 섬유를 장섬유부와 단섬유부인 두부분으로 분류하는 장치로 고지중에 함유하고 있는 10-30%의 단섬유부를 제거하는 공정이다. 여기에서 제거되는 단섬유부는 다른 초지기(30)로 보내어 특수한 용도로 사용되며, 필요시 이 단섬유부는 고해기(25)를 수행하지 않고 라인 17로 보내어진다. 고지중에 함유하고 있는 단섬유는 강도를 떨어뜨리는 주요인이며, 섬유커링기(21)의 작업효율을 크게 떨어뜨리기도 하므로 분리처리를 해야 한다.The notification line is particularly important in the present invention and requires a strong selection device. The selector 12 should be a device capable of sufficiently processing a large amount of impurities contained in the high land, and in particular, the light impurities such as wax should be sufficiently removed. The fiber classifier 14 is a device for classifying the fiber of box paper into two parts, a long fiber part and a short fiber part, and is a step of removing 10-30% of the short fiber part contained in the high paper. The short fiber portion removed here is sent to another paper machine 30 to be used for a special purpose, and if necessary, the short fiber portion is sent to line 17 without performing the crusher 25. The short fibers contained in the high paper is the main cause of dropping the strength, and because the work efficiency of the fiber curling machine 21 is greatly reduced, it must be separated.

농축기(18)에 유입되는 지료는 라인 7에서의 버진펄프와 라인 15에서의 고지를 혼합하여 사용할 수 있고, 라인 15의 고지만을 처리할 수 있다. 농축기(18)에선 스팀으로 온도를 조절하여 섬유커링기(21)의 최대작업조건을 유지하도록 수행되어야 한다. 섬유커링기(21)의 최대 작업조건은 입구 지료 농도가 28-34%, 출구 지료온도가 85-95℃를 유지되도록 하여 섬유커링효과와 약품반응효과를 극대화시켜야 한다. 이 작업 조건에서 섬유커링기(21)는 섬유간에 많은 전단변형, 비틀림, 가압 및 감압을 주어 섬유에 높은 탄성과 신축성을 주면서 섬유를 접히고 주름이 지게 한다. 이때 라인 20의 케미칼의 주약품은 산소계 표백과 염소계 표백등으로 일반적인 표백약품이며 고농도 표백을 이용하여 약품효과를 극대화했다.The feedstock flowing into the concentrator 18 can be used by mixing the virgin pulp in line 7 and the paper in line 15, and can process only the paper in line 15. In the concentrator 18, the temperature must be controlled by steam to maintain the maximum working conditions of the fiber curler 21. The maximum working condition of the fiber curler 21 is to maintain the inlet feedstock concentration of 28-34%, the outlet stock temperature of 85-95 ℃ to maximize the fiber curling effect and chemical reaction effect. In this working condition, the fiber curler 21 gives a lot of shear deformation, torsion, pressurization and decompression between fibers to give the fibers high elasticity and elasticity while allowing the fibers to be folded and wrinkled. At this time, the main chemicals of line 20 are oxygen bleaching and chlorine bleaching, and they are general bleaching chemicals.

타워(23)는 라인 20에서 투입된 약품이 지료와 함께 섬유커링기(21)를 통과한 후 충분한 약품반응을 위해 설치되었으며, 약품과 지료사이의 충분한 반응시간은 1-2시간이 효율적이다. 고해기(25)는 섬유커링기(21)을 통과하여 기계적·화학적으로 처리된 지료가 섬유 자체의 최대강도를 유지하기 위해선 가장 효율적으로 작업이 운영되어야 한다.The tower 23 is installed for sufficient chemical reaction after the chemical introduced in line 20 passes through the fiber curling machine 21 with the stock, the sufficient reaction time between the chemical and the stock is effective for 1-2 hours. The crusher 25 is passed through the fiber curling machine 21, the mechanically and chemically processed paper material must be operated most efficiently in order to maintain the maximum strength of the fiber itself.

[실시예 1]Example 1

기존 공정은 미극 박스 고지를 100% 사용하여 실시하였고, 본 발명 공정은 같은 고지를 100% 사용하여 섬유분류기(14)에서 농축기(18), 섬유커링기(21), 타워(23), 고해기(25)를 수행하는 공정으로 여기에서 각 장치의 작업조건은 섬유분류기(14)에선 장섬유부의 중량 평균 섬유장이 약 0.2mm 증가하도록 단섬유부를 제거하였으며, 농축기(18)에선 섬유커링기(21)의 출구 지료 농도가 28-34%의 범위를 유지하도록 조절하였고, 스팀을 사용하여 섬유커링기(21)의 출구온도를 85-95℃로 조절하였다. 라인 20에서는 표백약품을 투입하였으며, 타워(23)의 반응시간은 1-2시간으로 조절하였다. 이때 기존 공정을 수행한 크라프트종이의 강도를 기준으로 하여 섬유분류기(14)에서 라인 24까지와 본 발명 공정을 수행한 크라프트종이의 강도를 같은 고해도에서 측정된 결과는 다음과 같은 강도 상승효과가 있었다.Existing process was carried out using 100% of the microporous box notification, the present invention using 100% of the same notice in the fiber sorter 14, concentrator 18, fiber curling machine 21, tower 23, blast furnace In the process of (25), the working condition of each device is that in the fiber classifier 14, the short fiber part is removed so that the weight average fiber length of the long fiber part is increased by about 0.2 mm, and in the concentrator 18, the fiber curling machine 21 ), The outlet stock concentration was adjusted to maintain the range of 28-34%, and the outlet temperature of the fiber curler 21 was adjusted to 85-95 ° C using steam. In line 20, bleach was added, and the reaction time of the tower 23 was adjusted to 1-2 hours. At this time, based on the strength of the kraft paper that performed the existing process, the result of measuring the strength of the fiber sorter 14 to line 24 and the strength of the kraft paper which performed the present invention at the same high altitude is as follows. there was.

[표 1]TABLE 1

Figure kpo00001
Figure kpo00001

단. 평균강도=

Figure kpo00002
only. Mean intensity =
Figure kpo00002

[실시예 2]Example 2

기존 공정은 미극 박스 고지를 40%, 버진펄프인 UKP를 60%로 배합하여 크라프트종이를 제조하였고, 본 발명 공정은 기존공정에서 사용했던 원료를 사용했으며, 농축기(18)에서 라인 7의 버진펄프인 UKP를 20%, 라인 15의 미극 박스 고지를 80%로 배합하여 크라프트종이를 제조하였다. 본 발명 공정에서의 작업은 섬유분류기(14)에서 단섬유부를 20.0%, 장섬유부를 80.0%로 각각 분류하여 단섬유는 라인 16으로 처리하였고 장섬유부인 라인 15는 고해기(6)를 통과한 라인 7과 농축기(18)에서 혼합되어 섬유커링기(21), 타워(23), 고해기(25)를 수행하는 공정으로 농축기(18)에선 실시예 1과 같은 작업조건으로 농도를 30-36%로 조절하였고, 스팀을 사용하여 섬유커링기(21)의 출구온도를 85-95℃로 조절하였다. 라인 20에서는 표백약품을 투입하였으며, 타워(23)의 반응시간은 1-2시간으로 조절하였다. 이때 기존 공정에서 미극 박스 고지를 40%, UKP를 60% 사용하여 수행한 크라프트종이의 강도를 기준으로 하여, 미극 박스 고지 80%, UKP 20%를 각각 라인 15와 라인 7로 이용하여 본 발명 공정을 수행한 크라프트종이의 강도 결과는 다음과 같다.Existing process was prepared kraft paper by mixing 40% of the microporous box and 60% of the virgin pulp UKP, the process of the present invention using the raw material used in the existing process, the virgin pulp of line 7 in the concentrator 18 Kraft paper was prepared by blending 20% phosphorus UKP and 80% microbox box waste in line 15. In the process of the present invention, in the fiber classifier 14, the short fibers were classified into 20.0% and the long fibers into 80.0%, respectively, and the short fibers were treated in line 16, and the long fibers in line 15 were passed through the crusher 6. The process of mixing the line 7 and the concentrator 18 to perform the fiber curler 21, the tower 23, and the beating device 25. In the concentrator 18, the concentration is 30-36 under the same operating conditions as in Example 1. %, And the outlet temperature of the fiber curler 21 was adjusted to 85-95 ℃ using steam. In line 20, bleach was added, and the reaction time of the tower 23 was adjusted to 1-2 hours. At this time, based on the strength of the kraft paper performed using 40% microporous box notice and 60% UKP in the existing process, the present invention process using 80% microporous box notice and 20% UKP as line 15 and line 7, respectively. The result of the strength of the kraft paper is as follows.

[표 2]TABLE 2

Figure kpo00003
Figure kpo00003

단. 평균강도=

Figure kpo00004
only. Mean intensity =
Figure kpo00004

Claims (1)

섬유분류기, 농축기, 섬유커링기, 타워를 포함하는 일련의 고지처리 공정으로서 섬유분류기 사용시 고지중에 함유하고 있는 단섬유부를 제거하고 장섬유부를 농축기 및 섬유커링기로 보내며, 섬유커링기의 입구지료 농도가 28-34%, 출구지료 온도를 85-95℃로 조절하여 고지배합비를 60-80% 증대시키며, 크라프트종이의 강도를 상승시키는 공정.It is a series of paper processing processes including fiber sorter, thickener, fiber currying machine, and tower. When using fiber sorter, short fiber part contained in paper is sent, long fiber part is sent to thickener and fiber currying machine. 28-34%, the exit feed temperature is adjusted to 85-95 ℃ to increase the high paper blending ratio 60-80%, the process of increasing the strength of kraft paper.
KR1019900004793A 1990-04-07 1990-04-07 Process for kraft paper KR930003370B1 (en)

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