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WO2007004757A1 - Procede de production de pate a papier a partir du bambou et pate a papier et papiers produits a partir de celui-ci - Google Patents

Procede de production de pate a papier a partir du bambou et pate a papier et papiers produits a partir de celui-ci Download PDF

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Publication number
WO2007004757A1
WO2007004757A1 PCT/KR2005/002118 KR2005002118W WO2007004757A1 WO 2007004757 A1 WO2007004757 A1 WO 2007004757A1 KR 2005002118 W KR2005002118 W KR 2005002118W WO 2007004757 A1 WO2007004757 A1 WO 2007004757A1
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WO
WIPO (PCT)
Prior art keywords
pulp
paper
bamboo
chips
producing
Prior art date
Application number
PCT/KR2005/002118
Other languages
English (en)
Inventor
Kwon-Hyok Lee
Jong-Myoung Won
Original Assignee
Kwon-Hyok Lee
Jong-Myoung Won
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kwon-Hyok Lee, Jong-Myoung Won filed Critical Kwon-Hyok Lee
Publication of WO2007004757A1 publication Critical patent/WO2007004757A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/222—Use of compounds accelerating the pulping processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D21C9/06—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in filters ; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Definitions

  • the present invention relates to a technology for producing high-quality paper-making pulp capable of substituting for wood pulp, and paper products, using a bamboo, and encompasses a technology for producing various paper-making pulps usable in the production of industrial paper, printing and writing paper, thin wrapping paper, toilet paper, non-woven fabric and special purpose paper, from bamboos, as well as a method for producing various papers from said pulps.
  • the method according to the present invention can produce chemical pulp in mild conditions by facilitating the penetration of liquid chemicals in the production of the pulp, simplify a process, maximize pulp yield, and minimize the weakening of pulp fiber to maximize pulp quality.
  • the present invention relates to pulp produced using said method.
  • papermaking pulps are recognized to be produced using wood.
  • non-woody plants include paper mulberry bast fibers, hemps, cottons, and Manila hemps, and Korean Patent Publication Nos. 98-9651 and 93-2604 disclose a method for producing pulp using rice-straw. All such efforts can be considered as efforts to conserve trees, which can prevent environmental pollution.
  • a bamboo which has recently attracted attention and is used as a raw material in the present invention, is produced in large amounts in Southeast Asia countries such as China and Srivaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavaszavasza
  • the use of the bamboo has shortcomings in that, because the compact structure of the bamboo is not considered, the pulping of the bamboo is not satisfactorily achieved, large amounts of chemicals and energy are consumed, and a bleaching process is conducted in strong conditions to reduce yield and to cause the decomposition and destruction of fiber, making the fiber weak.
  • a chlorine bleaching process using elemental chlorine provides the cause of dioxin generation.
  • this processing problem acts as the cause of increasing chemical amount, energy consumption and production cost per unit pulp production.
  • Japanese Patent 3,184,993 invented by Kikuchi Shingo is very disadvantageous in terms of pulp yield, pulp quality and the consumption of liquid chemicals, because bamboo leaves and stalks are all used. Also, the technology of the household industrial level, which is difficult to perform mass production, is applied, because the bamboo is simply treated with an alkali solution in atmospheric conditions.
  • the paper making method in said Japanese Patent is a method for producing a kind of fiber mat for use in special applications such as forest bath, deodorization, air purification and wall papers using household industrial means and is entirely different from a paper production method for mass production, which is suggested in the present invention.
  • a shredder is used to prepare bamboo chips having a length of 10-25 cm or more, which are then chemically digested.
  • the fibers require a wide space for the storage thereof, because their volume is very large. Also, the fibers cannot be treated in large amounts during a digestion process.
  • the fibers are pre-impregnated with black liquor or digestion chemicals at high pressure to facilitate the digestion of chemicals. For this reason, additional processes, facilities and energy are required.
  • the dissociation of the fibers is induced by treatment such as an explosion process by repeating pressurization and depressurization in a digestion process.
  • the present invention has been made to solve the problems occurring in the prior art, and it is an object of the present invention to provide a method for producing high- quality papermaking pulp capable of substituting for wood pulp, and paper products, using a bamboo. More specifically, it is an object of the present invention to provide a method for producing various papermaking pulps using a bamboo, which makes it possible to produce the pulp in mild conditions by facilitating the impregnation of liquid chemicals into the pulp, simplify a process, maximize the pulp yield and minimize the weakening of the pulp fiber to maximize the quality of the pulp, as well as pulp prepared using said method, and a method for producing paper products from said pulp.
  • the pulp which is produced in the inventive method, can be used to produce various paper products, including industrial paper, printing and writing paper, thin wrapping paper, toilet paper, non-woven fabric and special purpose paper. [Technical Solution]
  • the present invention provides a method for producing pulp from a bamboo, the method comprising: a step of removing a leaf from a bamboo and splitting and cutting the leaf-removed bamboo to make bamboo chips; a step of screening the cut bamboo chips to filter out small fragments or impurities from the chips and washing the chips with water to remove contaminants from the bamboo chips; a step of cooking the screened bamboo chips, in which the bamboo chips are introduced into a digester, the ratio of a chemical liquor consisting of water, alkali and anthraquinone to the weight of the bamboo chips is adjusted to 1:3.5-6.0 (bamboo: chemical liquor), and the bamboo chips are cooked in the digester at high temperature, thus softening and pulping the bamboo chips; a step of cleaning the cooked pulp using a centrifugal cleaner so as to remove contaminants introduced together with the bamboo; a step of screening the cleaned pulp, in which contaminants are removed from the cleaned pulp using a pressure screen, and an incompletely cooked of the pulp is fed back into the digester;
  • the present invention provides a method for producing bleached chemical bamboo pulp for the production of tissue paper, wood-free paper, art paper or toilet paper, and a method for producing refiner mechanical pulp for the production of newsprint paper or medium-quality paper, each of the methods having modifications of said method for producing the unbleached chemical and semi- chemical bamboo pulps for industrial paper or liner paper for corrugated boards.
  • the present invention provides a method for producing industrial paper or liner paper for corrugated boards, the method comprising: a step of disintegrating the unbleached chemical or semi-chemical bamboo pulp produced according to said method; a step of refining the disintegrated pulp; a step of adding chemicals
  • sizing agent retention agent, strengthening agent and other additives
  • a step of screening the pulp having the chemicals added thereto a sheet forming step of making the screened pulp into a product (web) in the form of paper or paperboard; a pressing step of pressing the web obtained in the sheet forming step to remove water; a drying step of further removing water from the pressed web; a calendering step of making the thickness of the paper or paperboard uniform; a step of slitting and cutting the calendered paper into a sheet or roll and packing the sheet or roll.
  • the present invention provides a method for producing tissue paper, wood-free paper, art paper or toilet paper from bleached chemical bamboo pulp, and a method for producing newsprint paper or medium-quality paper from refiner mechanical pulp, each of the methods having modifications of said method for producing industrial paper and liner paper for corrugated boards.
  • FIG. 1 is a flow chart showing processes for producing bamboo pulps according to the present invention. [Best Mode]
  • the present invention relates to methods for producing papermaking pulps using a bamboo, as well as pulps produced using said methods, and methods for producing papers using the pulps.
  • the production methods have great characteristics and will now be described in detail.
  • the method for producing unbleached chemical and semi-chemical pulp for the production of industrial paper or liner paper for corrugated boards comprises: a first step of removing a leaf from a bamboo and splitting and cutting the leaf-removed bamboo; and a second step of screening the cut bamboo chips to filter out small fragments or impurities from the bamboo chips and washing the bamboo chips with water to remove contaminants from the bamboo chips .
  • the method comprises: a third step of cooking the washed bamboo chips, in which the bamboo chips are introduced into a digester, the ratio of a chemical liquor consisting of water, alkali and " anthraquinone to the weight of the bamboo chips is adjusted to 1:3.5-6.0 (bamboo: chemical liquor), and the bamboo chips are cooked in the digester at high temperature, thus softening and pulping the bamboo chips; and a fourth step of cleaning the cooked pulp using a centrifugal cleaner to remove contaminants introduced together with the bamboo .
  • the third step comprises conducting the cooking process in mild conditions and then conducting refining instead of the cleaning.
  • the method comprises: a fifth step of screening the chips, in which contaminants are removed from the cooked pulp using a pressure screen, and an incompletely cooked portion of the pulp is fed back into the digester; and a sixth step of washing and thickening the chips, in which a decker is used to wash the pulp, thus removing the chemical liquor, and to squeeze water from the pulp, thus thickening the pulp.
  • the method comprises: a seventh step of forming a sheet from the washed and thickened pulp and drying the sheet, thereby producing unbleached chemical and semi- chemical pulp for industrial paper or liner paper for corrugated boards.
  • the amount of alkali (as Na 2 O) added to water is 10- 30 % based on the oven-dry weight of the bamboo chips (i.e., mass excluding the content of moisture in the bamboo chips), and the anthraquinon (AQ) is added in an amount of 0.01-2%.
  • the bamboo leaf contains a large amount of extracts unnecessary to produce pulp, but has a small amount of essential fibrous material.
  • the bamboo leaf is of help to prepare pulp, but rather can act as the cause of increasing the consumption of chemicals, the bamboo leaf is removed before introducing the bamboo into a process for producing the pulp.
  • the bamboo leaf is not used and only the bamboo stalk is used.
  • the production of the pulp must be started with the crushing of the bamboo.
  • the bamboo is first longitudinally split into half, and the split bamboo is additionally split to a narrower width.
  • the bamboo is preferably split to a width of 1.5-2.0 mm.
  • This longitudinal splitting is a significantly characteristic step of the present invention, and when the bamboo is split at random without considering orientation, fibrous material will not be uniformly split, but rather the fibrous material itself can be broken. This reduces the strength of the produced pulp to reduce the quality thereof.
  • the bamboo is used after it is longitudinally split several times to have narrow width. It is also possible to use a method of splitting the bamboo in a one-step process using a device mounted with a plurality of blades.
  • the split bamboo is transversely cut to a length of 10-30 mm using a blade cutter. If the length of the bamboo chips is too large, they cannot be effectively packed into the digester, and if the bamboo is cut to an excessively short length, large damage to fiber can occur, resulting in the reduction in the strength of the pulp. Then, the second step of screening the cut bamboo chips to filter out small fragments or impurities from the chips and of washing the chips with water to remove contaminants from the chips is carried out.
  • the contaminant, dust and the like attached to the bamboo chips are removed with water.
  • the third step is carried out, in which the bamboo chips are introduced into a digester, the ratio of a chemical liquor consisting of water, alkali and anthraquinone to the weight of the bamboo chips is adjusted to 1:3.5-6.0 (bamboo: chemical liquor), and the bamboo chips are cooked in the digester at high temperature, thus softening and pulping the bamboo chips .
  • a soda- ⁇ Q process is applied in order to promote delignification and to prevent the decomposition of hemicellulose, thus increasing the yield and quality of the pulp.
  • the soda-AQ process comprises adding a liquor consisting of alkali (mainly NaOH) , anthraquinone and water in a liquor ratio of 3.5-6.9 : 1 with respect to the oven-dry weight of the bamboo chips.
  • the amount of alkali (as Na 2 O) added to water is preferably 10-30 % based on the oven- dry weight of the bamboo chips (i.e., mass excluding the content of moisture in the bamboo chips) , and the anthraquinon (AQ) is preferably added in an amount of 0.01-1%.
  • the cooking temperature in this cooking step is preferably 130-210 "C, and the cooking time is preferably controlled within the range of 90-120 minutes depending on the polymerization degree and the quality of pulp to be produced.
  • the term "oven-dry weight” means the mass of the bamboo chips that excludes the content of moisture in the bamboo chips.
  • the fourth step of cleaning the bamboo chips using a centrifugal cleaner so as to remove contaminants introduced together with the bamboo is conducted.
  • the centrifugal cleaner is used to remove contaminants introduced in the process together with the bamboo.
  • a fifth step of screening the pulp is conducted, in which contaminants are removed from the cooked pulp using a pressure screen, and an incompletely cooked portion of the pulp is fed back into the digester.
  • non-disintegrated fibrous portions or contaminants are removed using the pressure screen.
  • a portion passed through the screen is sent to a subsequent process, whereas a rejected portion remaining on the screen is filtered through a vibrating screen, a rejected portion remaining on the vibrating screen is wasted, and a fibrous portion or an incompletely cooked portion is sent back into the digester.
  • a sixth step of washing and thickening the pulp is conducted, in which a decker is used to wash the pulp, thus removing the chemicals from the pulp, and to squeeze water from the pulp, thus thickening the pulp.
  • the decker (not shown) is a machine that serves to wash the pulp and, at the same time, to thicken the pulp by squeezing water. Using this decker, the pulp is washed and thickened to a concentration suitable for the next step.
  • the washing operation is repeated at least three times in order to remove the remaining chemicals, fine powders and parenchyma cells as much as possible.
  • a seventh step of forming the washed pulp into a sheet or roll is conducted, in which the washed pulp is made into a sheet and dried, thus completing the production of unbleached chemical and semi-chemical pulp for industrial paper or liner paper for corrugated boards.
  • the cooking step in the above-described method is preferably carried out in the following conditions milder than those for the production of bleached chemical pulp: the content of active alkali: 12-14%; the content of AQ: 0.01 -
  • said unbleached chemical and semi-chemical pulp for the production of industrial paper or liner paper for corrugated boards bleached chemical pulp for the production of tissue paper, wood-free paper, art paper or toilet paper, and refiner mechanical pulp for the production of newsprint paper or medium-quality paper, can undergo a slitting, cutting and packing step.
  • the pulps should not be subjected to this slitting, cutting and packing step and should be immediately sent to a papermaking process to make paper and paperboard products.
  • the pulps are generally packed in the form of rolls or sheets.
  • the pulp produced in the pulping process is immediately fed into a papermaking process for use as a papermaking raw material without undergoing a drying process.
  • the bamboo pulp fiber has a structure and dimension different from those of wood pulp.
  • the method for producing bleached chemical pulp for the production of tissue paper, wood-free paper, art paper or toilet paper, using a bamboo comprises: a first step of removing a leaf from a bamboo and splitting and cutting the leaf-removed bamboo; and a second step of screening the cut bamboo chips to filter out small fragments or impurities from the chips and washing the chips to remove contaminants from the chips.
  • the method comprises: a third step of cooking the washed bamboo chips, in which the bamboo chips are introduced into a digester, the ratio of a chemical liquor consisting of water, alkali and anthraquinone to the weight of the bamboo chips is adjusted to 1:3.5-6.0 (bamboo: chemical liquor), and the bamboo chips are cooked in the digester at high temperature, thus softening and pulping the bamboo chips; and a fourth step of cleaning the cooked pulp using a centrifugal cleaner so as to remove contaminants introduced together with the bamboo.
  • the method comprises: a fifth step of screening the cleaned pulp, in which contaminants are removed from the cooked pulp using a pressure screen, and an incompletely cooked portion of the pulp is fed back into the digester; and a sixth step of washing and thickening the pulp, in which a decker is used to wash the pulp, thus removing the chemical liquor from the pulp, and to squeeze water from the pulp, thus thickening the pulp.
  • the method comprises: a seventh step of bleaching the thickened pulp; and a eighth step of forming the bleached pulp into a sheets or roll and drying the sheet or roll, thereby producing bleached chemical pulp for the production of tissue paper, wood-free paper, art paper or toilet paper.
  • the method for producing the bleached chemical pulp for the production of tissue paper, wood-free paper, art paper, special purpose paper or toilet paper is the same as the above-described method for producing the unbleached chemical and semi-chemical pulp for the production of industrial paper or corrugated board liner paper with respect to the first step to the sixth step, but it performs the cooking step in conditions stronger than those of the production of the unbleached chemical and semi-chemical pulp and comprises the seventh step of bleaching the pulps.
  • tissue paper, wood-free paper, art paper, special purpose paper or toilet paper must have a good texture and excellent colorful beauty sensations.
  • ECF elementary chlorine free
  • TCF total chlorine free
  • DEZP, DEOP, DEOZ and PEOZ can be selectively applied.
  • a bleaching process, the number of bleaching stages, and bleaching conditions, are determined depending on the degree of required bleaching.
  • D chlorine dioxide bleaching
  • E alkaline extraction
  • P peroxide bleaching
  • 0 oxygen bleaching
  • Z ozone bleaching
  • the metal ions in the pulp will be inactivated by treating the pulp with a chelating agent (EDTA, DTPA, DTPMPA, etc.) to increase bleaching efficiency before conducting the bleaching of the pulp.
  • a chelating agent EDTA, DTPA, DTPMPA, etc.
  • the chelating agent is a chemical for making the reactivity of metal ions impotent, and if large amounts the metal ions are present in the pulp, they will remarkably deteriorate the performance of a bleaching chemical used for bleaching.
  • the pulp is treated with the chelating agent before conducting the bleaching of the pulp.
  • the bleaching stages of DEDD indicate that bleaching is conducted in four sequential steps of: (1) chlorine dioxide bleaching, (2) alkaline extraction, (3) chlorine dioxide bleaching, and (4) chlorine dioxide bleaching.
  • various bleaching stages listed above indicate that a pulp producer may selectively the bleaching stages depending on the brightness or chemical purity required in the pulp to be produced, or the preference of a worker.
  • the number of the bleaching stages may be increased or the amount of chemicals used may be increased. Also, even if the same level is required, a method of reducing the amount of a chemical used in each stage and increasing the number of the stages can be used in order to minimize adverse effects on pulp (pulp damage and decomposition, etc) . Accordingly, even if the quality of the same level is required, it is possible to control the number of the bleaching stages or the amount of chemicals used, and it is difficult to express this control as an absolute numerical value, because the state of pulp supplied into the bleaching process varies depending the degrees of pulping or cooking conducted in the above-described steps.
  • the content of lignin in the pulp produced in the digester be first measured and, based on the measured content, the amount of addition of bleaching chemicals be calculated so as to increase or decrease the amount depending on the required quality.
  • the present invention can prevent the generation of dioxin, an environmental pollutant, using said bleaching agent, and has excellent bleaching effects.
  • the method for producing the bleached chemical pulp for the production of wood-free paper, art paper, non-woven fabric, special purpose paper or tissue paper comprises conducting the cooking process in the following conditions and the ECF or TCF bleaching process: the content of active alkali: 16 - 20%; the content of AQ 0.01-1%; liquor ratio: 3.5-6.0; cooking temperature: 150-180 ° C ; and cooking time: 120 - 200 minutes. Also, the yield of the produced papermaking pulp, the characteristics of the fibers, the papermaking characteristics, etc., are controlled through the combination of cooking conditions, bleaching conditions and methods.
  • the present invention also provides a method for producing refiner mechanical pulps for the production of newsprint paper or medium-quality paper.
  • This method comprises: a first step of removing a leaf from a bamboo and splitting and cutting the leaf-removed bamboo; and a second step of screening the cut bamboo chips to filter out small fragments or impurities from the chips and washing the chips with water to remove contaminants from the chips. Also, the method comprises: a third step of primarily refining the washed bamboo chips, in which the bamboo chips are ground in a disc refiner; and a fourth step of screening the refined bamboo chips, in which contaminants are removed from the bamboo chips using a pressure screen, and an incompletely defibrated portion of the chips is fed back into the disc refiner.
  • the method comprises: a fifth step of secondarily refining the defibrated pulp, in which the defibrated pulp is further ground; and a sixth step of screening the refined pulp, in which contaminants are removed from the pulp using a pressure screen, and an incompletely defibrated portion of the pulp is fed back into the disc refiner.
  • the method comprises: a seventh step of cleaning the defibrated pulp, in which contaminants introduced together with the bamboo are removed using a centrifugal cleaner; and an eighth step of forming the cleaned pulp into a sheet and drying the sheet.
  • the sequence of the steps of this method is substantially the same as that of the above- described method for producing unbleached chemical and semi- chemical pulp for the production of industrial paper or corrugated board liner paper and as that of the above- described method for producing bleached chemical pulp for the production of tissue paper, wood-free paper, art paper, non- woven fabric, special purpose paper or toilet paper, however, it is different in that the cooking step is not carried out and the two refining steps are additionally conducted.
  • refining step refers to a step of producing refiner mechanical pulp, in which the bamboo chips resulting from the previous washing step are ground in the disc refiner to produce the pulp.
  • This refining step in the present invention is repeated two times to grind the chips into very fine pieces.
  • the prepared, screened and washed bamboo chips are defibrated using the refiner so as to prepare refiner mechanical pulp for the production of newsprint paper and medium-quality paper.
  • the high brightness is required in the pulp, single-stage or two-stage peroxide bleaching is preferably carried out.
  • the present invention also provides articles produced according to all the above-described pulp production methods, i.e., pulps produced using a bamboo.
  • the pulps are made into the form of a sheet or roll, in which the sheet pulp has a thickness of 0.1-3 mm, and the roll pulp is obtained by winding a web having a thickness of 0.1-1.5 mm.
  • the sheet or roll pulp is an intermediate product, which will be introduced into a papermaking process to produce paper as described above.
  • the method for producing the industrial paper or corrugated board liner paper comprises: a step of disintegrating the unbleached chemical and semi-chemical bamboo pulp; and a step of refining the disintegrated pulp. Also, the method comprises: a step of adding chemicals (sizing agent, retention agent, strengthening agent and other additives) to the refined pulp; and a step of screening the pulp.
  • the method comprises: a sheet forming step of making the screened pulp into a product (web) in the form of a paper or paperboard; and a pressing step of pressing the web obtained in the sheet forming step to remove water from the web.
  • the method comprises: a drying step of further removing water from the pressed web; and a calendering step of making the thickness of the paper or paperboard uniform.
  • the method comprises a step of slitting and cutting the dried and calendered paper into a sheet or roll and packing the sheet or roll.
  • the pulp sheet is repulped or disintegrated into individual fibers using a pulper or hydrapulper.
  • This repulping or disintegration step may also be omitted, if the pulp is not made into the sheet in the pulp production process and is immediately fed to a papermaking process through pipe lines and the like.
  • wood pulp and bamboo pulp are refined using a disc refiner or cone refiner according to conditions required for the desired paper in order to control the structural, physical and optical properties of the paper.
  • Chemical pulp of broadleaf trees is usually refined at an SEL of about 0.1-5.0 Ws/m.
  • bamboo pulp needs to be treated in a manner different from wood pulp, because it has a relatively low lignin content, and its fiber is thin.
  • the bamboo pulp is either refined at a weak SEL (specific edge load; index indicative of the intensity of energy applied from the refiner to the pulp) of 0.01-2.5 Ws/m depending on the required properties of paper to be produced, or treated using a deflaker.
  • Refiners suitable for refining the bamboo pulp at low SEL include multidisk refiner, Conflo and the like.
  • the refining of the pulp is conducted at a higher SEL.
  • the addition of wet chemicals and additives is performed to adjust a process and to satisfy the properties of paper according to the kind and intended use thereof.
  • any filler is not used, and the addition of chemicals is adjusted only depending on required size degree, wet strength or dry strength.
  • Examples of a chemical, which can be used for the adjustment of sizing degree include rosin emulsion, AKD, ASA and the like, and examples of a wet strength agent, which can be used in the present invention, include urea resin, melamine resin, polyamide epichlorohydrin, acrylamide glyoxal and the like. This chemical is added in an amount of 0.1-3% depending on required wet strength or dry strength.
  • a filler is used in an amount of 10-30% for the improvement of printing quality.
  • the filler which can be used in the present invention, include calcium carbonate, activated clay, and titanium dioxide.
  • sizing agent examples include rosin emulsion, AKD, ASA and the like.
  • microparticle systems e.g., cationic starch, PAM, bentonite, colloidal silica, organic microparticles, etc. are used.
  • the screening step is performed to break aggregates formed in a paper stock preparation process or pipe lines for supplying the paper stock to a papermaking machine and to remove lumps, which are not disintegrated, before supplying the paper stock to the papermaking machine.
  • This screening step is usually performed just before the papermaking machine so as to pass the paper stock.
  • the sheet forming step for producing the paper- or board-like product is a process in which the raw material subjected to the paper stock preparation process is made into the form of a web.
  • the pressing step serves to remove water from the web formed in the sheet forming step, make the web more compact and facilitate the bonding between the fibers.
  • this step it is preferable to remove water as much as large within the range in which the quality of the product is not deteriorated. This reduces the use of steam in a drying section to increase economy.
  • the drying step of further removing water from the web passed through the pressing step is carried out, in which water in the web passed through the sheet forming step and pressing step is further removed to impart the inherent property of paper or paperboard.
  • the calendering step of making the thickness of the paper or paperboard uniform is carried out.
  • the calendering step serves to make the thickness of the paper or paperboard uniform and to smoothen the surface of the paper or paperboard.
  • the step of slitting and cutting the dried and calendered paper into a sheet or roll and packing the sheet or roll is finally performed, thereby producing industrial paper or corrugated board liner paper.
  • the dried and calendered paper or paperboard is finally slit and cut into a sheet or roll according to the demand of consumers, and the sheet or roll is packed.
  • the paper production method according to the present invention is not limited only to said industrial paper and corrugated board liner paper.
  • a method for producing wood-free paper and art paper will now be described in detail.
  • the method for producing wood-free paper and art paper comprises a step of disintegrating the chemical bamboo pulp produced according to the above-described inventive method and a step of refining the disintegrated pulp.
  • a step of blending the refined pulp with wood pulp (bleached chemical pulp of broadleaf trees) and a step of adding chemicals (sizing agent, filler, retention agent, dehydrating agent and other additives) to the blended pulp are carried out.
  • the method comprises a step of screening the chemical-added pulp and a sheet forming step of making the screened pulp into a product (web) in the form of paper or paperboard. Also, the method comprises a pressing step of pressing the web obtained in the sheet forming step to remove water from the web, and a drying step of further removing water from the pressed web. Also, the method comprises a step of sizing the surface of the dried web, a step of drying the sized web, and a calendering step of making the thickness of the paper or paperboard uniform.
  • the method comprises a step of coating the paper or paperboard with a pigment, a step of drying the coated paper or paperboard, and a super-calendering step of imparting surface smoothness and gloss to the paper or paperboard.
  • the dried and super-calendered paper is slit and cut into a sheet or roll shape which is then packed, thus producing wood-free paper and art paper.
  • this method is different in that it comprises the step of blending the refined pulp with wood pulp (board- leaved tree bleached chemical pulp, etc.), the step of sizing the surface of the dried web, the step of coating the paper, and the step of super-calendering the paper.
  • the blending of the pulps is performed to adjust the various properties of paper to be produced, by blending the refined pulp with the bleached craft pulp, thermal mechanical pulp, chemical thermal mechanical pulp or bleached chemical thermal mechanical pulp of broadleaf trees at a suitable ratio according to the required properties of the paper.
  • the bleached craft pulp of broadleaf trees is blended in an amount of about 50-80% to achieve the excellent smoothness and formation of paper so as to provide good printing quality.
  • the bleached craft pulp of needle-leaf trees, the bleached chemical pulp of bamboos, white ledger or CPO (computer printout) deinked pulp is blended in an amount of 10-25%.
  • bamboo pulp In the case of industrial paper, toilet paper and tissue paper, bamboo pulp can be used alone, and in some cases, it can be used in a mixture with wastepaper.
  • the surface sizing is performed to control the impregnation of fluid into paper and improve the surface characteristics of paper so as to improve the surface strength and printing quality of the paper.
  • oxidized starch is usually used, but in some cases, the web can be treated with a coating pigment in a sizing press, such that the print quality of the paper can be further improved without a need for a coating process.
  • the method comprises the pigment coating step and the super-calendering step.
  • the super-calendering step is performed to impart surface smoothness and gloss to the coated base paper.
  • the intermediate product pulp produced in the above-described method for producing the bleached chemical pulp for the production of tissue paper, wood-free paper, art paper or toilet paper is produced into wood-free paper or art paper as a final product.
  • an embodiment of the method for producing printing and writing paper such as wood-free paper or coated base paper will now be described in further detail.
  • the bleached chemical bamboo pulp is blended with wood pulp such as the bleached chemical pulp or bleached chemical thermal mechanical pulp of broadleaf trees.
  • papermaking chemicals such as 10-30% of filler (calcium carbonate, clay, talc, titanium dioxide, etc.), 0.1- 3% of a sizing agent (rosin emulsion, AKD or ASA) and/or a retention agent (cationic starch, PAM, bentonite, colloidal silica, organic microparticles, etc.) can be added to the pulp.
  • filler calcium carbonate, clay, talc, titanium dioxide, etc.
  • a sizing agent rosin emulsion, AKD or ASA
  • a retention agent cationic starch, PAM, bentonite, colloidal silica, organic microparticles, etc.
  • the surface of paper is sized with oxidized starch. If necessary, the surface sizing can also be performed using a coating pigment.
  • the bleached chemical pulp of boardleaf trees is refined at an SEL of about 0.1-5.0 Ws/m, and the chemical bamboo pulp is refined at a weak SEL of about 0.01-2.5 Ws/m depending on the required properties of paper or is simply treated using a deflaker.
  • tissue paper and toilet paper can also be produced using the above- described method for producing the bleached chemical pulp.
  • steps of this method will now be described.
  • this method comprises a step of disintegrating the bleached chemical bamboo pulp and a step of refining the disintegrated pulp.
  • the method comprises a step of adding chemicals (sizing agent, retention agent, strengthening agent and other additives) to the refined pulp and a step of screening the chemical-added pulp.
  • the method comprises a sheet forming step of making the screened pulp into a paper- or paperboard-like product, and a pressing step of pressing the web obtained in the sheet forming step to remove water from the web.
  • the method comprises a drying step of further removing water from the pressed web, and a final step of slitting and cutting the dried paper into a sheet or roll which is then packed, thus producing tissue paper.
  • the present invention also provides a method for producing toilet paper using the bleached chemical bamboo pulp, and the method will now be described in detail.
  • this method for producing toilet paper comprises a step of disintegrating the bleached chemical bamboo pulp produced according to the present invention, and a step of refining the disintegrated pulp.
  • the method comprises a step of adding chemicals (sizing agent, retention agent, strengthening agent and other additives) to the refined pulp, and a step of screening the chemical-added pulp.
  • the method comprises a sheet forming step of making the screened pulp into a paper or sheet product, and a pressing step of pressing the web obtained in the sheet forming step to remove water from the web.
  • the method comprises a drying step of further removing water from the pressed web, and a final step of slitting and cutting the dried paper into a sheet or roll which is then packed, thus producing toilet paper.
  • the tissue paper or toilet paper is dried using a Yankee dryer and prepared to have low weight and thus low strength. For this reason, in order to impart the paper with the ability capable of resisting a force applied during the use thereof, a doctor blade attached to the end of the Yankee dryer is used to form invisible wrinkles on the tissue paper or toilet paper.
  • the present invention provides a method for producing newsprint paper or medium-quality paper using the refiner mechanical pulp of bamboos.
  • this method will now be described in detail.
  • a step of disintegrating the refiner mechanical pulp of bamboos is first carried out.
  • the method comprises a step of disintegrating and refining a strengthening pulp, and a step of blending the refined strengthening pulp with said refined refiner mechanical pulp.
  • the method comprises a step of adding chemicals (sizing agent, filler, retention agent, strengthening agent and other additives) , and a sheet forming step of making the blended pulp into a paper or paperboard product.
  • the method comprises a pressing step of pressing the web obtained in the sheet forming step to remove water from the web, and a drying step of further removing water from the pressed web.
  • the method comprises a step of sizing the surface of the dried web, a step of drying the sized web, and a step of slitting and cutting the dried paper into a sheet or roll which is then packed, thus producing newsprint paper or medium-quality paper.
  • the paper may also be coated with a coating pigment in a sizing press instead of performing the surface sizing.
  • the sizing agent is used in an amount of 0-0.5%
  • the strengthening agent is used in an amount of 0-0.5%.
  • wrinkles are formed on the paper using a doctor blade in a Yankee dryer, or the paper is embossed after the drying step.
  • Example 1 A Vietnamese bamboo was split to a width of about 2 mm and then cut to a length of 15-25 mm. The cut material was screened through a 60-mesh screen to remove contaminants and small bamboo fragments, followed by washing.
  • *Kappa number is used to indicate the amount of lignin remaining in the pulp produced in the digester, and is used as a standard for determining the amount of addition of chemicals in bleaching, and is calculated from the consumed amount of potassium permanganate through oxidation-reduction titration.
  • Example 2 The pretreatment of bamboo was performed in the same manner as in Example 1. Also, the amount of addition of chemical liquor in pulping was adjusted to 16%, 14% and 12%, and as an additive for promoting a reaction and protecting hemicellulose, 0.1% AQ was used. For the evaluation of the possibility of use as industrial paper, the pulp was not bleached. The washed pulp was refined with 400 ml of CSF, thus preparing hand-made paper having a weight of 80 g/m 2 . The properties of the resulting paper are shown in Table 2 below.
  • the split and cut bamboo chips are pulped in the cooking process using the soda-anthraquinon process using anthraquinon as a catalyst.
  • the present invention can have great effects on delignification, the improvement in pulp quality and the increase in pulp yield.
  • the bamboo chips are made thin in the raw material treatment process to facilitate the impregnation of liquid chemicals into the chips and the cooking of the chips.
  • papermaking pulp can be produced in milder conditions by previously eliminating the factors of causing the loss of chemicals and reducing the pulp quality.
  • the soda-AQ process in which anthraquinone is used as a catalyst in a cooking step, is applied for the pulping of bamboo, so that the present invention can have great effects on delignification, the improvement in pulp quality and the increase in pulp yield.
  • an environmental problem such as the generation of dioxin can be solved by applying an ECF and TCF bleaching process, and it is possible to control the quality of paper depending on the properties of paper to be produced, by controlling the cooking and bleaching conditions.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne une technique de production de pâte à papier de haute qualité pouvant remplacer la pâte à papier à base de pâte de bois, qui exploite le bambou, ainsi que des produits obtenus par cette technique. L'invention concerne des techniques de production d'une variété de pâtes à papier à partir du bambou que l'on peut utiliser dans la production de papiers industriels, de papiers d'imprimerie et d'écriture, de papiers d'emballage fins, de papiers hygiéniques et de papiers spéciaux, ainsi que des procédés de production d'une variété de produits en papier à partir du bambou. L'invention concerne également un procédé de production de la pâte à papier qui exploite le bambou, qui permet de produire de la pâte à papier dans des conditions modérées en facilitant la pénétration de produits chimiques liquides dans la production de pâte chimique, de simplifier les procédés de fabrication, et de maximiser le rendement de pâte et minimiser la faiblesse des fibres de pâte, ce qui optimise la qualité de la pâte; l'invention concerne enfin la pâte et les papiers produits suivant ce procédé.
PCT/KR2005/002118 2005-06-30 2005-07-04 Procede de production de pate a papier a partir du bambou et pate a papier et papiers produits a partir de celui-ci WO2007004757A1 (fr)

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KR1020050057464A KR100547492B1 (ko) 2005-06-30 2005-06-30 대나무를 이용하여 생산하는 펄프의 제조방법과 그 펄프 및그 지류 제조방법

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EP2135893A1 (fr) * 2008-05-27 2009-12-23 Wu, Jui-Liang Procédé de fabrication d'une composition de matériau fibreux biodégradable
EP2402504A1 (fr) * 2010-06-29 2012-01-04 M-real Oyj Papier transparent comprenant des matières fibreuses composées de plantes annuelles et/ou d'autres matières fibreuses non dérivées du bois à croissance rapide
WO2013041986A2 (fr) 2011-09-21 2013-03-28 Kimberly-Clark Worldwide, Inc. Produit de papier d'essuyage comportant du bambou
WO2013044347A1 (fr) * 2011-09-28 2013-04-04 Prairie Pulp & Paper Inc. Procédé de préparation d'un papier en fibre non ligneuse
US8795469B2 (en) 2010-06-25 2014-08-05 Prairie Paper Ventures Inc. Method for preparing nonwood fiber paper
WO2016011736A1 (fr) * 2014-07-24 2016-01-28 四川环龙新材料有限公司 Pâte a papier ecrue fabriquee a partir de fibre de bambou et son procede de preparation, et papier de base ecru a usage quotidien fabrique a partir de la pâte a papier
US9816233B2 (en) 2012-09-28 2017-11-14 Kimberly-Clark Worldwide, Inc. Hybrid fiber compositions and uses in containerboard packaging
US9908680B2 (en) 2012-09-28 2018-03-06 Kimberly-Clark Worldwide, Inc. Tree-free fiber compositions and uses in containerboard packaging
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CN109957990A (zh) * 2017-12-25 2019-07-02 福建省青山纸业股份有限公司 一种用竹浆生产复合原纸工艺方法
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US11053643B2 (en) 2017-02-22 2021-07-06 Kimberly-Clark Worldwide, Inc. Layered tissue comprising non-wood fibers
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KR102055423B1 (ko) * 2019-05-02 2019-12-12 국방과학연구소 리파이닝 공정을 적용한 고강도 소진탄피의 제조방법
KR102239395B1 (ko) * 2020-07-06 2021-04-12 대한민국 목섬유를 이용한 난연 섬유판의 제조방법
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CN100441772C (zh) * 2007-02-06 2008-12-10 新邵县广信有限责任公司 热磨机械竹浆的生产工艺
EP2135893A1 (fr) * 2008-05-27 2009-12-23 Wu, Jui-Liang Procédé de fabrication d'une composition de matériau fibreux biodégradable
US8795469B2 (en) 2010-06-25 2014-08-05 Prairie Paper Ventures Inc. Method for preparing nonwood fiber paper
EP2402504A1 (fr) * 2010-06-29 2012-01-04 M-real Oyj Papier transparent comprenant des matières fibreuses composées de plantes annuelles et/ou d'autres matières fibreuses non dérivées du bois à croissance rapide
WO2013041986A2 (fr) 2011-09-21 2013-03-28 Kimberly-Clark Worldwide, Inc. Produit de papier d'essuyage comportant du bambou
CN103814173A (zh) * 2011-09-21 2014-05-21 金伯利-克拉克环球有限公司 包含竹的薄纸产品
EP2758593A4 (fr) * 2011-09-21 2015-04-29 Kimberly Clark Co Produit de papier d'essuyage comportant du bambou
TWI577855B (zh) * 2011-09-21 2017-04-11 金百利克拉克國際公司 含竹材之薄紙製品
WO2013044347A1 (fr) * 2011-09-28 2013-04-04 Prairie Pulp & Paper Inc. Procédé de préparation d'un papier en fibre non ligneuse
US9816233B2 (en) 2012-09-28 2017-11-14 Kimberly-Clark Worldwide, Inc. Hybrid fiber compositions and uses in containerboard packaging
US9908680B2 (en) 2012-09-28 2018-03-06 Kimberly-Clark Worldwide, Inc. Tree-free fiber compositions and uses in containerboard packaging
WO2016011736A1 (fr) * 2014-07-24 2016-01-28 四川环龙新材料有限公司 Pâte a papier ecrue fabriquee a partir de fibre de bambou et son procede de preparation, et papier de base ecru a usage quotidien fabrique a partir de la pâte a papier
US11053643B2 (en) 2017-02-22 2021-07-06 Kimberly-Clark Worldwide, Inc. Layered tissue comprising non-wood fibers
US11634870B2 (en) 2017-02-22 2023-04-25 Kimberly-Clark Worldwide, Inc. Layered tissue comprising non-wood fibers
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