WO2014002945A1 - 板紙の製造方法 - Google Patents
板紙の製造方法 Download PDFInfo
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- WO2014002945A1 WO2014002945A1 PCT/JP2013/067240 JP2013067240W WO2014002945A1 WO 2014002945 A1 WO2014002945 A1 WO 2014002945A1 JP 2013067240 W JP2013067240 W JP 2013067240W WO 2014002945 A1 WO2014002945 A1 WO 2014002945A1
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- component
- added
- paperboard
- pulping process
- water
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Classifications
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/07—Nitrogen-containing compounds
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/11—Halides
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
- D21H17/375—Poly(meth)acrylamide
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/64—Alkaline compounds
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
- D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
Definitions
- the present invention relates to a method for producing paperboard using waste paper as a main raw material. More specifically, the present invention relates to a paperboard manufacturing method that can more efficiently manufacture paperboard such as corrugated cardboard by using waste paper as a main raw material and reducing the amount of paper strength enhancer added.
- wastepaper In paperboard such as corrugated cardboard, wastepaper accounts for the majority of the raw material.
- the pulping process that uses pulper to disaggregate and beat pulp material that is mainly used paper to obtain pulping process water.
- a paperboard is manufactured through a preparation step of obtaining a prepared pulp raw material by adding an additive containing an enhancer and a papermaking step of obtaining a paperboard by making the obtained raw pulp raw material.
- a paper strength enhancer is added to the preparation process water in order to maintain the strength of the obtained paperboard.
- Patent Document 1 in order to prevent the starch from decomposing in the pulping process water of waste paper, on the premise that the starch is decomposed due to decay due to the propagation of microorganisms, A paper manufacturing method is proposed in which amylase activity, starch concentration, pH, oxidation-reduction potential, and the like of process water are continuously or intermittently measured, and a bactericidal agent is added based on the measurement results.
- Patent Document 2 proposes a method of suppressing slime by adding a bactericide to dilution water for diluting the raw material in the process of manufacturing paper using waste paper or the like as a raw material.
- the time required from the pulping step to the preparation step is about 1 hour to several hours at the longest, although it depends on the target machine. That is, even if starch or paper strength enhancer derived from waste paper is present on the fiber, the pulping process water flows into the preparation process in a short time without stagnation. It is very unlikely that the paper strength enhancer will decompose due to spoilage.
- a large amount of paper strength enhancer needs to be added in the preparation process. This is thought to be due to the physical disaggregation of starch and paper strength enhancer present on the waste paper fibers from the pulping process to the preparation process.
- An object of the present invention is to provide a paperboard manufacturing method capable of manufacturing paperboard such as corrugated cardboard more economically by using waste paper as a main raw material and reducing the amount of paper strength enhancer added.
- the inventors of the present invention are expected to be able to reduce the addition amount of paper strength enhancer if the starch and paper strength enhancer derived from waste paper are retained without being dissociated from the fiber in the pulping process.
- the pulping process water used in the production of paperboard made of waste paper was used as an aqueous solution of hypochlorite such as sodium hypochlorite and ammonium sulfate.
- hypochlorite such as sodium hypochlorite and ammonium sulfate.
- the fact that the amount of the paper strength enhancer added in the preparation process can be significantly reduced by adding such an aqueous solution of a water-soluble inorganic ammonium salt or aqueous ammonia is confirmed in an actual on-site process, and the present invention is completed. It reached.
- Patent Document 2 starch and paper strength enhancer derived from waste paper are less likely to decompose due to decay in a short time from the pulping process to the preparation process and papermaking process.
- a pulping process for obtaining pulping process water by disaggregating and beating fibers from a pulp raw material mainly composed of waste paper, and an additive containing a paper strength enhancer in the obtained pulping process water Is a method for producing paperboard, which includes a preparation step for obtaining a raw material for preparing pulp and a papermaking step for obtaining a paperboard by producing the raw material for prepared pulp, (A) An aqueous solution of hypochlorite and (b) an aqueous solution of a water-soluble inorganic ammonium salt or aqueous ammonia are added to the pulping process water, and the amount of paper strength enhancer added in the preparation process is increased.
- a method for producing paperboard characterized in that the paperboard is produced with a reduced amount.
- the paperboard manufacturing method of the present invention it is possible to provide a paperboard manufacturing method capable of more economically manufacturing paperboard such as corrugated cardboard by reducing the amount of paper strength enhancer using waste paper as a main raw material. it can. That is, the method for producing a paperboard of the present invention is more economical because the amount of paper strength enhancer added in the preparation process can be reduced by effectively using starch (remaining) derived from waste paper and paper strength enhancer. In addition, it is possible to produce a paperboard, which is extremely useful industrially.
- paper strength enhancers examples include paper strength enhancers that can be used in the manufacture of paperboard, such as cationized starch, amphoteric starch, polyvinyl alcohol, polyacrylamide, and polyamide / epichlorohydrin. Paper strength enhancers.
- the method for producing the paperboard of the present invention comprises: (A) Component is an aqueous solution of sodium hypochlorite, potassium hypochlorite or calcium hypochlorite hypochlorite, and (b) component is ammonium chloride, ammonium bromide, phosphoric acid When it is an aqueous solution of water-soluble inorganic ammonium salt of ammonium, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, ammonium sulfate or ammonium nitrate or aqueous ammonia, -When the pulping process water has a pulp concentration of 3-5%, ⁇ (A) component has an effective chlorine concentration of 1000 to 9000 mg / L, (b) component has a concentration of 1000 to 9000 mg / L, and (a) effective chlorine in component (b) and nitrogen in component (b) When the component (a) and the component (b) having a molar ratio of 1: 1 to 1: 2 are added in an amount of 1
- the paperboard manufacturing method of the present invention is a pulping process for obtaining pulping process water by disaggregating and beating fibers from a pulp raw material mainly composed of waste paper, and adding a paper strength enhancer to the obtained pulping process water. It is a method for producing paperboard including a preparation step for obtaining a raw material for preparing pulp by adding an agent, and a papermaking step for obtaining a paperboard by papermaking the raw material for prepared pulp, (A) An aqueous solution of hypochlorite and (b) an aqueous solution of a water-soluble inorganic ammonium salt or aqueous ammonia are added to the pulping process water, and the amount of paper strength enhancer added in the preparation process is increased. It is characterized by producing paperboard with reduced amount.
- the pulping process in which fibers are disaggregated and beaten to obtain pulping process water from pulp raw materials mainly containing wastepaper that is, pulping in which pulp raw materials such as wastepaper are disaggregated and beaten with a pulper.
- pulping process water in the pulp process from the pulper and the pulper chest to the finished chest.
- the pulping process water preferably has a pulp concentration of 3-5%. If the pulp concentration is in the above range, the excellent effect of the present invention can be obtained more efficiently.
- the component (a) used in the present invention is not particularly limited as long as the effects of the present invention are not inhibited.
- an aqueous solution of hypochlorite of sodium hypochlorite, potassium hypochlorite and calcium hypochlorite Is mentioned.
- these aqueous solutions can be suitably used, and among them, a sodium hypochlorite aqueous solution is particularly preferable.
- (B) component used in this invention is not specifically limited unless the effect of this invention is inhibited,
- ammonium chloride, ammonium bromide, ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, ammonium sulfate and Examples thereof include an aqueous solution of a water-soluble inorganic ammonium salt of ammonium nitrate and aqueous ammonia.
- these aqueous solutions and aqueous ammonia can be suitably used, and among them, an aqueous ammonium chloride solution and an aqueous ammonium sulfate solution are particularly preferable.
- the component (a) and the component (b) used in the present invention are not particularly limited as long as the effects of the present invention are not impaired, and a commercially available aqueous solution is used as it is, or a solution obtained by appropriately diluting the aqueous solution with water, or a commercially available product.
- a compound obtained by dissolving a suitable compound with water can be used.
- the sodium hypochlorite aqueous solution of component (a) used in the present invention is not particularly limited as long as it does not inhibit the effects of the present invention, and a commercially available sodium hypochlorite aqueous solution having a concentration of 9 to 14% by weight. Can be suitably used.
- the ammonium sulfate aqueous solution as the component (b) used in the present invention is not particularly limited as long as the effects of the present invention are not impaired, and commercially available ammonium sulfate dissolved in water can be suitably used.
- the concentration is, for example, 10 to 40% by weight, preferably 10 to 35% by weight.
- ammonium chloride aqueous solution of component (b) used in the present invention is not particularly limited as long as the effects of the present invention are not impaired, and commercially available ammonium chloride diluted appropriately with water can be suitably used. .
- the concentration after dilution is, for example, 10 to 30% by weight.
- the component (a) has an effective chlorine concentration of 1000 to 9000 mg / L
- the component (b) has a concentration of 1000 to 9000 mg / L
- component (b) having a molar ratio of nitrogen in the component of 1: 1 to 1: 2 is added to the pulping process water.
- the amount added varies depending on the amount of chlorine required in the pulping process water to be added, but it is added in the preparation process by adding 1 to 40 mg / L in terms of the effective chlorine concentration to the pulping process water. From the viewpoint of the effect of reducing the amount of paper strength enhancer added.
- component has a concentration of 1000 to 3000 mg / L
- component has a concentration of 1000 to 3000 mg / L
- effective chlorine in component and (b) nitrogen in component The molar ratio is 1: 1.1 to 1: 1.6.
- a preferable addition amount to the pulping process water is 1 to 20 mg / L in terms of effective chlorine concentration.
- the effective chlorine concentration of the specific component (a) is 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800. 2900, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, and 9000 mg / L.
- Specific component (b) concentrations are 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900. 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 8500, and 9000 mg / L.
- Specific molar ratios of effective chlorine in component (a) and nitrogen in component (b) are 1: 1.1, 1: 1.2, 1: 1.3, 1: 1.4, 1: 1.5 and 1: 1.6.
- (a) component and (b) component are added to pulping process water simultaneously or separately.
- the order of addition of the component (a) and the component (b) is not particularly limited, but in order to efficiently obtain the excellent effects of the present invention, the pulping process water is used in the order of the component (a) and the component (b). It is preferable to add, and also when preparing a mixed solution beforehand, it is preferable to add to a dilution water in order of (a) component and (b) component.
- a dilution water line flowing into the pulping process water (a) component addition point to the dilution water in the dilution water line, and (a) component addition point and the dilution water line Add component (b) to the dilution water inside Add component (b), add component (a) to component addition point, component (b) add component (b) to component addition point
- Add component (b) to the dilution water inside Add component (b)
- (a) component and (b) component are added to pulping process water continuously or intermittently.
- the concentration of the component (a) and the component (b) may be reduced or the addition frequency may be intermittent within a range that does not impair the effects of the present invention. For example, as described in Examples, intermittent addition for 5 minutes can be mentioned once per hour.
- a chlorine meter for measuring the effective chlorine concentration in the diluted water and the pH of the mixed solution of the component (a) and the component (b) are set. It is preferable to install a pH meter for measurement in the dilution water line and adjust the addition amount of the component (a) and the component (b) based on the measurement results.
- the paper strength enhancer added in the preparation step is to set the pH of the mixed solution to 8 or more. From the viewpoint of the effect of reducing the amount of addition.
- the pH of the mixed solution is less than 8, it is preferable to add to the pulping process water after adjusting the pH of the mixed solution to 8 or more by adding an alkali agent such as sodium hydroxide or potassium hydroxide. .
- the preparation step and the paper making step may be performed using known apparatuses and methods and appropriately setting conditions.
- an appropriate amount of additives other than the paper strength enhancer may be added to the pulping process water in order to obtain a paperboard having desired properties and physical properties.
- the amount of the paper strength enhancer added when manufacturing paperboard from pulp raw materials made mainly of used paper varies depending on the components contained in the pulp raw material, the content thereof, the performance required of the paperboard to be manufactured, etc. Therefore, it can be reduced by 15 to 90% by weight with respect to the usual addition amount.
- Example 1 Using waste paper as the main raw material, machine board A manufacturing machine A that produces 700 tons of cardboard liner (cover) per day was used. In this machine A, normally, 0.75 kg / ton of polyacrylamide-based paper strength enhancer is continuously added to the pulping process water in the preparation process (Comparative Reference Example 1).
- the amount of polyacrylamide paper strength enhancer added in the preparation process was reduced from 0.75 kg / ton to 0.33 kg / ton for pulp (56% reduction during normal operation).
- the above mixed solution is a dilution water line that flows into the pulping process water, (a) component addition point for adding sodium hypochlorite of component (a) to the dilution water (industrial water) in the dilution water line, and (B) Component ammonium sulfate is added (b) Component addition point is provided, and (a) Component addition point and (b) Component addition point of (a) component and (b) component are set to satisfy the above conditions. It prepared by adding each in order.
- Example 2 Using waste paper as the main raw material, a cardboard liner (cover) and a core (paper tube base paper) were manufactured using a paperboard manufacturing factory machine B that produces 470 tons of Nissan. In this machine B, normally, 3.9 kg / ton of a polyacrylamide paper strength enhancer is continuously added to the pulping process water in the preparation process (Comparative Reference Example 2).
- a liner was produced by adding machine once per hour for 5 minutes so that the concentration was 20 mg / L, and operating machine B for 60 days. However, the addition amount of the polyacrylamide paper strength enhancer in the preparation process was reduced from 3.9 kg / ton to 2.9 kg / ton for pulp (25% reduction during normal operation).
- the above mixed solution is a dilution water line that flows into the pulping process water, (a) component addition point for adding sodium hypochlorite of component (a) to the dilution water (industrial water) in the dilution water line, and (B) Component ammonium sulfate is added (b) Component addition point is provided, and (a) Component addition point and (b) Component addition point of (a) component and (b) component are set to satisfy the above conditions. It prepared by adding each in order.
- Example 3 Using the paperboard manufacturing factory machine A of Example 1, it was carried out as follows. In this machine A, usually, 0.75 kg / ton of polyacrylamide paper strength enhancer is continuously added to the pulping process water in the preparation process (Comparative Reference Example 3).
- a liner was manufactured by adding machine once every hour for 5 minutes so that the concentration was 10 mg / L and operating machine A for 90 days. However, the amount of polyacrylamide paper strength enhancer added in the preparation process was reduced from 0.75 kg / ton to 0.33 kg / ton for pulp (56% reduction during normal operation).
- the above mixed solution is a dilution water line that flows into the pulping process water, (a) component addition point for adding sodium hypochlorite of component (a) to the dilution water (industrial water) in the dilution water line, and (B) Component ammonium chloride is added (b) Component addition point is provided, and (a) Component addition point and (b) Component addition point are the (a) component and (b) component so as to satisfy the above conditions In this order, each was added.
- paperboard such as corrugated cardboard can be more economically produced by using waste paper as the main raw material and reducing the amount of paper strength enhancer added.
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Description
古紙を主原料とする板紙の製造では、まずパルパーを用いて古紙を主原料とするパルプ原料を離解・叩解させてパルプ化工程水を得るパルプ化工程、得られたパルプ化工程水に紙力増強剤を含む添加剤を加えて調成パルプ原料を得る調成工程および得られた調成パルプ原料を抄いて板紙を得る抄紙工程などを経て、板紙を製造している。調成工程では、得られた板紙の強度を保持するために、紙力増強剤を調成工程水に添加している。
そこで、特開2010-100945号公報(特許文献1)では、澱粉が微生物の繁殖による腐敗に起因して分解することを前提に、古紙のパルプ化工程水における澱粉の分解を防止するために、工程水のアミラーゼ活性、澱粉濃度、pHおよび酸化還元電位などを連続的または間欠的に測定し、その測定結果に基づいて殺菌剤を添加する紙の製造方法を提案している。
しかしながら、古紙を主原料とする板紙の製造では、調成工程において多量の紙力増強剤の添加を必要としている。これは、パルプ化工程から調成工程に到るまでに、古紙の繊維上に存在する澱粉や紙力増強剤が物理的に離解しているものと考えられる。
しかしながら、古紙に由来する澱粉や紙力増強剤がパルプ化工程から調成工程、抄紙工程に到るまでの短時間に腐敗により分解する可能性が少ないこと、特許文献2において指摘されているように、パルプ濃度が3%以上と高いパルプ化工程水に殺菌剤を直接添加しても十分な殺菌効果が発揮されないことから、次亜塩素酸ナトリウム水溶液と硫酸アンモニウムとの併用による殺菌効果とは別の作用機序により、調成工程における紙力増強剤の添加量の低減効果が発揮されるものと考えられる。
前記パルプ化工程水に(a)次亜塩素酸塩の水溶液と(b)水溶性の無機アンモニウム塩の水溶液またはアンモニア水とを添加して、前記調成工程における紙力増強剤の添加量を低減させて板紙を製造することを特徴とする板紙の製造方法が提供される。
すなわち、本発明の板紙の製造方法は、古紙に由来する(残存する)澱粉や紙力増強剤を有効利用して、調成工程における紙力増強剤の添加量を低減できることから、より経済的に板紙を製造することができ、産業上極めて有用である。
低減できる紙力増強剤としては、板紙の製造において使用し得る紙力増強剤が挙げられ、例えば、カチオン化澱粉、両性澱粉、ポリビニルアルコール、ポリアクリルアミド系、ポリアミド・エピクロロヒドリン系などの公知の紙力増強剤が挙げられる。
・(a)成分が、次亜塩素酸ナトリウム、次亜塩素酸カリウムまたは次亜塩素酸カルシウムの次亜塩素酸塩の水溶液であり、(b)成分が、塩化アンモニウム、臭化アンモニウム、リン酸アンモニウム、リン酸二水素アンモニウム、リン酸水素二アンモニウム、硫酸アンモニウムもしくは硝酸アンモニウムの水溶性の無機アンモニウム塩の水溶液またはアンモニア水である場合に、
・パルプ化工程水が3~5%のパルプ濃度を有する場合に、
・(a)成分が有効塩素濃度として1000~9000mg/Lの濃度、(b)成分が1000~9000mg/Lの濃度を有しかつ(a)成分中の有効塩素と(b)成分中の窒素のモル比が1:1~1:2である(a)成分と(b)成分とを、パルプ化工程水に対して有効塩素濃度に換算して1~40mg/L添加する場合に、
・(a)成分と(b)成分とを混合して混合溶液を調製し、得られた混合溶液をパルプ化工程水に添加する場合に、
・パルプ化工程水に流入する希釈水ライン、該希釈水ライン中の希釈水に(a)成分を添加する(a)成分添加ポイントおよび該希釈水ライン中の希釈水に(b)成分を添加する(b)成分添加ポイントを設け、該(a)成分添加ポイントに(a)成分を、該(b)成分添加ポイントに(b)成分をそれぞれ添加する場合に、
上記の効果がさらに発揮される。
前記パルプ化工程水に(a)次亜塩素酸塩の水溶液と(b)水溶性の無機アンモニウム塩の水溶液またはアンモニア水とを添加して、前記調成工程における紙力増強剤の添加量を低減させて板紙を製造することを特徴とする。
パルプ濃度が上記の範囲であれば、より効率的に本発明の優れた効果を得ることができる。
また、本発明において用いる(b)成分の硫酸アンモニウム水溶液としては、本発明の効果を阻害しない限り特に限定されず、市販されている硫酸アンモニウムを適宜水で溶解させたものを好適に用いることができる。その濃度は、例えば、10~40重量%であり、10~35重量%であるのが好ましい。
さらに、本発明において用いる(b)成分の塩化アンモニウム水溶液としては、本発明の効果を阻害しない限り特に限定されず、市販されている塩化アンモニウムを適宜水で希釈したものを好適に用いることができる。希釈後の濃度は、例えば、10~30重量%である。
より好ましくは、(a)成分が1000~3000mg/Lの濃度、(b)成分が1000~3000mg/Lの濃度を有しかつ(a)成分中の有効塩素と(b)成分中の窒素のモル比が1:1.1~1:1.6である。
また、好ましいパルプ化工程水に対する添加量は、有効塩素濃度に換算して1~20mg/Lである。
(a)成分と(b)成分との添加順序は特に限定されないが、本発明の優れた効果を効率的に得るためには、(a)成分、(b)成分の順にパルプ化工程水に添加するのが好ましく、また予め混合溶液を調製する場合にも、(a)成分、(b)成分の順に希釈水に添加するのが好ましい。
用いる薬剤のコストを低減するために、本発明の効果を阻害しない範囲で、(a)成分と(b)成分の濃度を低下させるか、または添加頻度を間欠的にすればよい。例えば、実施例に記載のように、1時間に1回5分間の間欠添加が挙げられる。
調成工程および抄紙工程は、公知の装置および方法を用い、適宜条件を設定して実施すればよい。調成工程では、所望の性状や物性を有する板紙を得るために、紙力増強剤以外の添加剤を適量、パルプ化工程水に加えてもよい。
古紙を主原料として、段ボールのライナー(表紙)を日産700トン製造する某板紙製造工場マシンAを用いて実施した。このマシンAでは、通常、調成工程においてパルプ化工程水に、ポリアクリルアミド系紙力増強剤を対パルプ0.75kg/トンを連続添加している(比較参考例1)。
上記マシンAの調成工程におけるパルプ化工程水(損紙パルパー、パルプ濃度3.5%)に、12重量%の次亜塩素酸ナトリウム(NaOCl)水溶液を工業用水で60倍に希釈した溶液(有効塩素量:2400mg/L)に35重量%の硫酸アンモニウム水溶液((NH4)2SO4)を混合溶液内の有効塩素と窒素のモル比が1:1.2となるように混合し、これを有効塩素濃度換算として10mg/Lになるように1時間に1回5分間添加してマシンAを90日間操業し、ライナーを製造した。
但し、調成工程におけるポリアクリルアミド系紙力増強剤の添加量を、対パルプ0.75kg/トンを0.33kg/トンに低減した(通常操業時の56%低減)。
また、マシンAからの排水(活性汚泥処理前)のCODを測定したところ、従来の通常操業時の550mg/Lから300mg/Lに低下した。この結果から、本発明の混合溶液を添加することにより、原料古紙中の澱粉や紙力増強剤の繊維からの離脱が抑制されたものと考えられる。
古紙を主原料として、段ボールのライナー(表紙)および中芯(紙管原紙)を日産470トン製造する某板紙製造工場マシンBを用いて実施した。このマシンBでは、通常、調成工程においてパルプ化工程水に、ポリアクリルアミド系紙力増強剤を対パルプ3.9kg/トンを連続添加している(比較参考例2)。
上記マシンBの調成工程におけるパルプ化工程水(完成チェスト、パルプ濃度4%)に、12重量%の次亜塩素酸ナトリウム(NaOCl)水溶液を工業用水で60倍に希釈した溶液(有効塩素量:2400mg/L)に35重量%の硫酸アンモニウム水溶液((NH4)2SO4)を混合溶液内の有効塩素と窒素のモル比が1:1.2となるように混合し、これを有効塩素濃度換算として20mg/Lとなるように1時間に1回5分間添加してマシンBを60日間操業し、ライナーを製造した。
但し、調成工程におけるポリアクリルアミド系紙力増強剤の添加量を、対パルプ3.9kg/トンを2.9kg/トンに低減した(通常操業時の25%低減)。
また、マシンAからの排水(活性汚泥処理前)のCODを測定したところ、従来の通常操業時の600mg/Lから350mg/Lに低下した。この結果から、本発明の混合溶液を添加することにより、原料古紙中の澱粉や紙力増強剤の繊維からの離脱が抑制されたものと考えられる。
実施例1の某板紙製造工場マシンAを用いて以下のように実施した。このマシンAでは、通常、調成工程においてパルプ化工程水に、ポリアクリルアミド系紙力増強剤を対パルプ0.75kg/トンを連続添加している(比較参考例3)。
上記マシンAの調成工程におけるパルプ化工程水(損紙パルパー、パルプ濃度3.5%)に、12重量%の次亜塩素酸ナトリウム(NaOCl)水溶液を工業用水で60倍に希釈した溶液(有効塩素量:2400mg/L)に20重量%の塩化アンモニウム水溶液(NH4Cl)を混合溶液内の有効塩素と窒素のモル比が1:1.2となるように混合し、これを有効塩素濃度換算として10mg/Lになるように1時間に1回5分間添加してマシンAを90日間操業し、ライナーを製造した。
但し、調成工程におけるポリアクリルアミド系紙力増強剤の添加量を、対パルプ0.75kg/トンを0.33kg/トンに低減した(通常操業時の56%低減)。
また、マシンAからの排水(活性汚泥処理前)のCODを測定したところ、従来の通常操業時の550mg/Lから300mg/Lに低下した。この結果から、本発明の混合溶液を添加することにより、原料古紙中の澱粉や紙力増強剤の繊維からの離脱が抑制されたものと考えられる。
Claims (6)
- 古紙を主原料とするパルプ原料から繊維を離解・叩解させてパルプ化工程水を得るパルプ化工程、得られたパルプ化工程水に紙力増強剤を含む添加剤を加えて調成パルプ原料を得る調成工程および得られた調成パルプ原料を抄いて板紙を得る抄紙工程を含む板紙の製造方法であり、
前記パルプ化工程水に(a)次亜塩素酸塩の水溶液と(b)水溶性の無機アンモニウム塩の水溶液またはアンモニア水とを添加して、前記調成工程における紙力増強剤の添加量を低減させて板紙を製造することを特徴とする板紙の製造方法。 - 前記(a)成分が、次亜塩素酸ナトリウム、次亜塩素酸カリウムまたは次亜塩素酸カルシウムの次亜塩素酸塩の水溶液であり、前記(b)成分が、塩化アンモニウム、臭化アンモニウム、リン酸アンモニウム、リン酸二水素アンモニウム、リン酸水素二アンモニウム、硫酸アンモニウムもしくは硝酸アンモニウムの水溶性の無機アンモニウム塩の水溶液またはアンモニア水である請求項1に記載の板紙の製造方法。
- 前記パルプ化工程水が、3~5%のパルプ濃度を有する請求項1に記載の板紙の製造方法。
- 前記(a)成分が有効塩素濃度として1000~9000mg/Lの濃度、前記(b)成分が1000~9000mg/Lの濃度を有しかつ前記(a)成分中の有効塩素と前記(b)成分中の窒素のモル比が1:1~1:2である前記(a)成分と前記(b)成分とを、前記パルプ化工程水に対して有効塩素濃度に換算して1~40mg/L添加する請求項1に記載の板紙の製造方法。
- 前記(a)成分と前記(b)成分とを混合して混合溶液を調製し、得られた混合溶液を前記パルプ化工程水に添加する請求項1に記載の板紙の製造方法。
- 前記パルプ化工程水に流入する希釈水ライン、該希釈水ライン中の希釈水に前記(a)成分を添加する(a)成分添加ポイントおよび該希釈水ライン中の希釈水に前記(b)成分を添加する(b)成分添加ポイントを設け、該(a)成分添加ポイントに前記(a)成分を、該(b)成分添加ポイントに前記(b)成分をそれぞれ添加する請求項1に記載の板紙の製造方法。
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| BR112014032298A BR112014032298A2 (pt) | 2012-06-25 | 2013-06-24 | processo para a fabricação de papelão |
| CN201380031107.6A CN104471148B (zh) | 2012-06-25 | 2013-06-24 | 纸板的制备方法 |
| JP2013548124A JP5621082B2 (ja) | 2012-06-25 | 2013-06-24 | 板紙の製造方法 |
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| US14/407,677 US9546452B2 (en) | 2012-06-25 | 2013-06-24 | Process for manufacturing paperboard |
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| JP7219517B1 (ja) | 2022-03-31 | 2023-02-08 | 株式会社片山化学工業研究所 | 紙力増強剤の効果向上方法 |
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| CN107385992A (zh) * | 2017-06-28 | 2017-11-24 | 吕超 | 一种纸箱包装用耐水环保纸板的制备方法 |
| CN109853296A (zh) * | 2019-01-08 | 2019-06-07 | 广东理文造纸有限公司 | 一种抑菌清洁纸的制备方法 |
| JP7598143B2 (ja) | 2021-04-23 | 2024-12-11 | 株式会社片山化学工業研究所 | 製紙工程における紙力増強剤の効果向上方法 |
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| Publication number | Publication date |
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| EP2865807A1 (en) | 2015-04-29 |
| CN104471148A (zh) | 2015-03-25 |
| KR20150024341A (ko) | 2015-03-06 |
| US9546452B2 (en) | 2017-01-17 |
| KR101689360B1 (ko) | 2016-12-26 |
| BR112014032298A2 (pt) | 2017-06-27 |
| JPWO2014002945A1 (ja) | 2016-05-30 |
| EP2865807A4 (en) | 2016-02-17 |
| JP5621082B2 (ja) | 2014-11-05 |
| CN104471148B (zh) | 2016-08-17 |
| US20150167248A1 (en) | 2015-06-18 |
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