WO2012070644A1 - 紙を製造する方法 - Google Patents

紙を製造する方法 Download PDF

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Publication number
WO2012070644A1
WO2012070644A1 PCT/JP2011/077191 JP2011077191W WO2012070644A1 WO 2012070644 A1 WO2012070644 A1 WO 2012070644A1 JP 2011077191 W JP2011077191 W JP 2011077191W WO 2012070644 A1 WO2012070644 A1 WO 2012070644A1
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Prior art keywords
amount
paper
water
measuring
water quality
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PCT/JP2011/077191
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English (en)
French (fr)
Japanese (ja)
Inventor
仁樹 桂
要 原田
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栗田工業株式会社
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Priority to JP2011552239A priority Critical patent/JP5655796B2/ja
Priority to KR1020137012532A priority patent/KR101543733B1/ko
Priority to CN201180056193.7A priority patent/CN103370471B/zh
Publication of WO2012070644A1 publication Critical patent/WO2012070644A1/ja

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/08—Controlling the addition by measuring pulp properties, e.g. zeta potential, pH
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/78—Controlling or regulating not limited to any particular process or apparatus
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/04—Oxidation reduction potential [ORP]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/05—Conductivity or salinity
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/11—Turbidity

Definitions

  • the present invention relates to a paper manufacturing method for paper making from paper raw materials.
  • Paper-making water systems that make paper from paper raw materials contain high concentrations of organic matter and are warm environmental conditions, so that slime (biofilm) is generated by bacteria, resulting in decreased productivity such as paper breakage, Causes problems such as deterioration of quality such as spots and defects.
  • foaming in manufacturing processes such as papermaking also adversely affects product quality and productivity.
  • Patent Document 1 discloses that when the oxidation-reduction potential is an abnormal value, the cause is identified as a microorganism and a slime inhibitor is added.
  • Patent Document 2 discloses the degree of foaming in white water. Is abnormal, it is disclosed that the cause is identified as bubbles in white water and an antifoaming agent is added.
  • the conventional method is an approach that is implemented after paper quality degradation has occurred, and as described above, there are a variety of potential causes of paper quality degradation. May be required. For this reason, it has been difficult to sufficiently maintain the paper production efficiency.
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a paper manufacturing method capable of improving the manufacturing efficiency of high-quality paper.
  • the present inventors have found that by measuring a plurality of water quality parameters in parallel with the operation of the papermaking system, it is possible to quickly grasp an anomaly that may cause a decrease in paper quality. It came. Specifically, the present invention provides the following.
  • a method for producing paper In a papermaking aqueous system for making paper from a paper raw material, a method comprising measuring two or more water quality parameters related to water quality in parallel with the operation of the papermaking system and performing water treatment based on the measured values.
  • the water quality parameters are oxidation-reduction potential, glucose amount, organic acid amount, pH, calcium ion amount, electrical conductivity, turbidity, cation requirement, temperature, foaming degree, COD (chemical oxygen requirement)
  • BOD biochemical oxygen demand
  • dissolved oxygen content starch content
  • residual chlorine content residual chlorine content
  • the measurement of the water quality parameter includes a raw material system for producing pulp from a paper raw material, a preparation / papermaking system for preparing the pulp to make paper, a recovery system for recovering white water from the preparation / papermaking system, and the above
  • the present invention by measuring a plurality of water quality parameters in parallel with the operation of the papermaking system, it is possible to quickly grasp an anomaly that may cause a decrease in paper quality, and to perform an appropriate water treatment based on that, Paper quality deterioration can be prevented or highly suppressed.
  • 1 is a block diagram of a papermaking system in which a method according to an embodiment of the present invention is performed. It is a block diagram of the papermaking type
  • FIG. 1 is a block diagram of a papermaking system 10 in which the method according to the present invention is implemented.
  • the papermaking system 10 includes a raw material system 20, a preparation / papermaking system 30, a recovery system 40, a chemical injection system 50, and a control system 60.
  • the raw material system 20 produces pulp from paper raw materials.
  • the raw material system 20 in this embodiment has a chemical pulp tank 21, a regenerated pulp tank 22, and a broke tank 23.
  • the chemical pulp tank 21 has chemicals such as softwood bleached kraft pulp (LBKP) and hardwood bleached kraft pulp (NBKP).
  • the pulp and recycled pulp tank 22 contain recycled pulp such as deinked pulp (DIP), and the broke tank 23 contains broke pulp as paper raw materials.
  • An apparatus for producing and supplying each paper raw material may be provided upstream of the chemical pulp tank 21 and the recycled pulp tank 22.
  • a digester for digesting wood chips, a device for bleaching pulp, a screen for removing foreign matter, and the like may be provided upstream of the chemical pulp tank 21, and used paper is dissolved upstream of the recycled pulp tank 22.
  • a pulper, a floater for removing ink, a device for bleaching pulp, a screen for removing foreign matter, and the like may be provided.
  • the broke tank 23 is supplied with broke pulp produced in the preparation / papermaking system 30 or produced in another system.
  • Pulp accommodated in the chemical pulp tank 21, the regenerated pulp tank 22 and the broke tank 23 is supplied to the mixing chest 24 at an appropriate ratio, and is mixed in the mixing chest 24.
  • the mixed pulp is transferred to the seed box 26 after adding papermaking chemicals such as a sticky agent in the machine chest 25.
  • the chemical pulp tank 21, the regenerated pulp tank 22, the broke tank 23, the mixing chest 24, the machine chest 25, and the seed box 26 constitute the raw material system 20 of the present invention.
  • the preparation / papermaking system 30 prepares pulp and makes paper.
  • the pulp accommodated in the seed box 26 is sequentially supplied to the screen 32 and the cleaner 33 by the pump 31 together with the white water from the white water silo 38 to be described later, where the foreign matter is removed and then supplied to the inlet 34.
  • the inlet 34 suppresses flocs and flow stripes by supplying pulp to the wire of the wire part 35 at an appropriate concentration, speed, and angle.
  • the supplied pulp is dehydrated with a wire part 35 and a press part 36, and then dried with a dryer part (not shown), and then subjected to appropriate processing to produce paper.
  • the water from the water tank 37 is sprinkled on the wire part 35 and the press part 36 in order to clean the wire and felt.
  • the water dehydrated from the pulp by the wire part 35 and the press part 36 and the water after watering are received by the white water silo 38 as white water.
  • Part of the white water received by the white water silo 38 is supplied to the pump 31 and the rest is supplied to the seal pit 41.
  • the elements from the pump 31 to the white water silo 38 constitute the preparation / papermaking system 30 of the present invention.
  • the collection system 40 collects white water from the preparation / papermaking system.
  • the supplied white water is transferred to the recovery device 42 through the seal pit 41, and is filtered and solid-liquid separated by the recovery device 42.
  • the filtrate is recovered into the recovered water tank 43 and stored.
  • a part of the filtrate is further filtered, returned from the primary treated water tank 44 to the water tank 37 or discharged to the outside, and the other parts to the chemical pulp tank 21, the recycled pulp tank 22 and the broke tank 23. Returned and each reused.
  • the seal pit 41, the recovery device 42, and the recovery water tank 43 constitute the recovery system 40 of the present invention.
  • the primary treated water tank 44 constitutes a drainage system that performs drainage treatment on a part of white water collected by the collection system.
  • the portion through which water circulates constitutes the water system according to an embodiment of the present invention, and is a portion where slime is likely to be formed through various causes. Therefore, in the papermaking system 10, an oxidizing disinfectant is added to the aqueous system from the chemical injection device 51 of the chemical injection system 50 to suppress slime.
  • the location where the oxidizing disinfectant is added is not particularly limited, but is preferably a portion where slime is easily formed, or an efficient portion for suppressing slime in the entire aqueous system. Also good. Specifically, in FIG.
  • the water derived from the primary treated water tank 44 is introduced into the wet broke tank 45, and a part of the water from the seal pit 41 is cut out of the coated paper. Then, the paper is introduced into a CB (coat broke) tank 46 for storing paper (damaged paper) in which a defect has occurred.
  • the slurry derived from the CB tank 46 and the slurry derived from the wet broke tank 45 are transferred to the broke tank 23.
  • the oxidizing disinfectant from the chemical injection device 51 is added to the white water silo 38 through the addition pipe 53 and to the primary treated water tank 44 through the addition pipe 55.
  • the compound which produces hypochlorous acid and / or hypobromite in water is preferable, for example, chlorine, chlorine dioxide, highly bleached powder, hypochlorous acid, sodium hypochlorite , Potassium hypochlorite, calcium hypochlorite, ammonium hypochlorite, magnesium hypochlorite, hypobromite, sodium hypobromite, potassium hypobromite, calcium hypobromite, hypochlorous acid
  • hypobromite by simultaneously reacting inorganic bromides such as sodium bromide, potassium bromide, ammonium bromide and calcium bromide with oxidizing compounds such as chlorine, chlorine dioxide and ozone.
  • oxidizing compounds such as chlorine, chlorine dioxide and ozone.
  • organic fungicides include 2-bromo-2-nitropropane-1,3-diol, 2,2-dibromo-2-nitro-1-ethanol, 2,2-dibromo-3-nitrilopropionamide, 1 , 4-bis (bromoacetoxy) -2-butene and the like.
  • These oxidizing disinfectants may be used alone or in combination of two or more.
  • the chemical injection device 51 may be an appropriate facility depending on the type of oxidizing disinfectant used.
  • the method of the present invention includes a step of measuring two or more water quality parameters related to water quality in parallel with the operation of the papermaking system 10 and performing water treatment based on the measured value. Thereby, it is possible to prevent or highly suppress the deterioration of the paper quality by grasping the abnormality that may cause the deterioration of the paper quality at an early stage and performing the appropriate water treatment based thereon. Note that the measurement may be performed continuously or intermittently.
  • the water quality parameter is not particularly limited, and may be appropriately selected according to the circumstances of the aqueous system in which the method of the present invention is performed.However, the oxidation-reduction potential, glucose amount, organic acid amount, pH, calcium ion amount, electrical conductivity, Two or more selected from the group consisting of turbidity, cation requirement, temperature, degree of foaming, COD, BOD, dissolved oxygen content, starch content, residual chlorine content, and respiration rate are preferred.
  • the oxidation-reduction potential is a parameter that reflects the anaerobic or aerobic state in the aqueous system, and the lower the value, the easier the slime is formed.
  • the lower the measured redox potential value the greater the treatment level of bactericidal (eg, addition of oxidizing bactericides) or bacteriostatic (eg, water-based cooling), and the higher the measured value, the higher the bactericidal or bacteriostatic treatment level. cut back.
  • ORP meters 63 and 65 for measuring the oxidation-reduction potential are provided in the broke tank 23 and the seed box 26, and these ORP meters 63 and 65 transmit the measured values to the control device 61 of the control system 60. Send to.
  • the control device 61 controls the chemical injection system 50 based on the received measurement value, and adjusts the addition amount of the oxidizing disinfectant from the chemical injection device 51 to the white water silo 38 and the recovered water tank 43.
  • ORP meters 63A, 65A, 67 for measuring the oxidation-reduction potential are provided in the seal pit 41, the wet broke tank 45, and the CB tank 46, and the control device 61 moves from the chemical injection device 51 to the white water silo 38, primary.
  • the amount of oxidizing disinfectant added to the treated water tank 44 is adjusted.
  • the control apparatus 61 increases / decreases the opening degree and opening time length of the valve (not shown) provided in the addition pipes 53 and 55, for example.
  • the adjustment of the addition amount is not limited to such automatic control, and may be artificial control.
  • glucose is a degradation product of starch by microorganisms
  • the amount of glucose reflects the degree of propagation of microorganisms. The higher the measured value of the glucose amount, the higher the treatment level of bactericidal or bacteriostatic, and the lower the measured value, the lower the treatment level of bactericidal or bacteriostatic.
  • glucose starch decomposition product and nutrient source of microorganisms
  • microorganisms grow and decrease dissolved oxygen, and the ORP value decreases.
  • microbial contamination cannot be grasped when glucose is consumed by microorganisms and the value is low.
  • the ORP value together, microbial contamination is also observed. Can be grasped.
  • organic acids are also degradation products of starch by microorganisms
  • the amount of organic acids reflects the degree of propagation of microorganisms.
  • the organic acid include one or more of formic acid, acetic acid, propionic acid, butyric acid, oxalic acid, valeric acid and the like.
  • an organic acid is generated, and an organic acid salt is generated by combining this organic acid with calcium. Therefore, by measuring the ORP value together with the amount of organic acid, Organic acid salt pitch generation can be predicted.
  • the increase in the amount of glucose and the amount of organic acid indicates the degradation of starch by microorganisms
  • generation of organic acid salt derived from organic acid can be predicted by measuring both.
  • the measured pH value in the present invention refers to the measured pH value at each time point, and is clearly different from the amount of change in pH over time as disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-1000094. Based on the measured pH value, the ORP measured value having pH dependence can be appropriately corrected.
  • the ORP measurement value is higher than the true ORP value in the system to which the oxidant is added, but the true ORP value is calculated by correcting the ORP measurement value based on the pH measurement value, and an appropriate drug injection is obtained. Control can be performed.
  • generation of organic acid is estimated from the fall of pH, and if it is judged from the ORP value that it is an anaerobic state, generation
  • the occurrence of calcium carbonate defects after starch degradation can be predicted by measuring the amount of glucose together with the amount of calcium ions.
  • the amount of organic acid or pH together with the amount of calcium ion increases through a decrease in pH due to the organic acid, and the occurrence of calcium carbonate defects can be predicted.
  • the electrical conductivity reflects the amount of ionic substances in the water system and is considered as a factor that affects the fixing efficiency of chemicals such as polymers on paper products. For this reason, the higher the measured value of electrical conductivity, the higher the level of sterilization or bacteriostatic treatment, and the lower the measured value, the lower the level of sterilization or bacteriostatic treatment.
  • an instrument for measuring electrical conductivity is provided alongside the ORP meters 63 and 65. If the electrical conductivity increases under anaerobic conditions, starch degradation is expected. The starch adhering to the fiber is broken down, and a release of the pitch contained between the fiber and starch occurs. For this reason, this pitch can be predicted by measuring the ORP value together with the electrical conductivity.
  • the ionic substances increase with the decrease in pH due to the organic acid generated after starch degradation, and the calcium carbonate defect and the inorganic substance defect It can be predicted that it will occur.
  • Turbidity reflects the amount of components that give turbidity (for example, anionic trash components) and affects the efficacy of drugs (for example, bactericides). For this reason, the treatment level of sterilization or bacteriostasis and coagulation (for example, addition of a coagulant) is increased as the measured value of turbidity is higher, and the treatment level of sterilization or bacteriostasis is decreased as the measurement value is lower. If turbidity increases under anaerobic conditions, starch degradation is expected. The starch adhering to the fiber is broken down, and a release of the pitch contained between the fiber and starch occurs. For this reason, this pitch can be predicted by measuring the ORP value together with turbidity.
  • Requirement of cation reflects the possibility of anion trash and affects the efficacy of drugs (for example, bactericides). For this reason, the treatment level of bactericidal or bacteriostatic or coagulation (for example, addition of a coagulant) is increased as the measured value of the cation requirement amount is higher, and the treatment level of bactericidal or bacteriostatic is reduced as the measured value is lower. If the cation requirement is increased under anaerobic conditions, starch degradation is expected. The starch adhering to the fiber is broken down, and a release of the pitch contained between the fiber and starch occurs. For this reason, this pitch can be predicted by measuring the ORP value together with the required cation amount.
  • the cation requirement increases when the amount of glucose or organic acid increases, starch degradation is expected, so by measuring the glucose amount, organic acid amount or pH together with the cation requirement, the occurrence of pitch defects can be prevented. Can be predicted. By measuring the amount of calcium ions, electrical conductivity, or turbidity together with the required amount of cation, it is possible to predict the occurrence of defects of inorganic substances such as calcium through the production of organic acids due to starch degradation.
  • the temperature varies depending on various factors including the propagation of microorganisms, but the efficacy of drugs (for example, bactericides and antifoaming agents) often depends on the temperature. For this reason, it is preferable to adjust temperature so that temperature may fall in a predetermined preferable range according to the chemical
  • the higher the measured value of the degree of foaming the higher the processing level of antifoam (for example, addition of antifoaming agent), and the lower the measured value, the processing level of antifoaming (for example, addition of antifoaming agent).
  • the degree of foaming is typically measured by foaming in the white water silo 38. Due to the increase in pH, the amount of foaming increases and foam defects occur. For this reason, by measuring foaming with pH, addition of an antifoamer can be optimized and generation
  • COD and BOD reflect the anaerobic nature of the water system depending on the amount of deinked pulp (DIP) used, etc., and affect the load level of the drainage system.
  • DIP deinked pulp
  • COD or BOD tends to increase if the fixing efficiency of polymer or starch to paper deteriorates. Based on the measured value of COD or BOD, grasp the transition of fixing efficiency of polymer or starch to paper. be able to. An increase in COD and BOD under anaerobic conditions suggests starch degradation and drug colonization inhibition.
  • medical agent can be estimated by measuring ORP value, the amount of glucose, or the amount of organic acids with a COD and BOD value.
  • ORP value By measuring pH together with COD or BOD, it is possible to improve the yield of chemicals and to suppress defects caused by excess chemicals.
  • An increase in calcium ions closes the anion group of the drug, leading to a decrease in its effect, but in a system with a large amount of filler, measuring the amount of COD or BOD together with the calcium ion amount or electrical conductivity, predicts unfixed drug be able to.
  • the amount of dissolved oxygen reflects the amount of oxygen consumed by microorganisms.
  • the treatment level of sterilization or bacteriostasis is increased as the measured value of the dissolved oxygen amount is lower, and the treatment level of sterilization or bacteriostasis is decreased as the measurement value is higher.
  • An increase in glucose and a decrease in dissolved oxygen indicate starch degradation by microorganisms under anaerobic conditions. By measuring the amount of glucose together with dissolved oxygen, microbial growth due to starch degradation is expected, and slime defects can be predicted. It becomes.
  • Starch is one of the components of paper, but it is degraded by enzymes secreted by microorganisms, so the amount of starch reflects the degree of propagation of microorganisms. The lower the measured amount of starch, the higher the level of sterilization or bacteriostatic treatment, and the higher the measured value, the lower the level of sterilization or bacteriostatic treatment. When measuring only the amount of starch, it is difficult to grasp the microbial contamination when starch and glucose are consumed by microorganisms, but by measuring the ORP value, the microbial contamination in such a case can also be predicted. be able to. By measuring the amount of starch together with the amount of glucose, microbial growth can be predicted even when the amount of glucose varies due to hydrogen peroxide contamination.
  • the amount of residual chlorine reflects the amount of disinfectant that suppresses the growth of microorganisms.
  • the amount of residual chlorine decreases, the growth of microorganisms is expected, so the level of sterilization or bacteriostatic treatment is increased.
  • the ORP value becomes high due to the mixing of the oxidant and it is difficult to predict the propagation of microorganisms
  • the propagation of microorganisms can be predicted by measuring the residual chlorine amount.
  • Even when the amount of glucose varies due to hydrogen peroxide contamination, microbial growth can be predicted by measuring the amount of residual chlorine.
  • microbial growth In a system with many fillers, it is difficult to grasp microbial growth only by measuring the amount of calcium ions, but microbial growth can be predicted by measuring the amount of residual chlorine. In a system in which industrial water is mixed, it is difficult to grasp the increase in electrical conductivity, but microbial growth can be predicted by measuring the amount of residual chlorine together with the electrical conductivity. Even when it is difficult to measure turbidity such as high-concentration pulp, microbial growth can be predicted by measuring the residual chlorine amount together with the turbidity. In a system containing a lot of bubbles, it is difficult to predict the growth of microorganisms by measuring only the amount of dissolved oxygen, but the growth of microorganisms can be predicted by measuring the amount of residual chlorine. In a system to which starch is added, it is difficult to predict microbial growth by measuring only the amount of starch, but microbial growth can be predicted by measuring the amount of residual chlorine.
  • Respiration rate reflects the amount of microorganisms. As the respiration rate increases, the growth of microorganisms is expected, so the level of disinfection or bacteriostatic treatment is increased. Even when an oxidizing agent and a reducing agent are added and the ORP value fluctuates, microbial growth can be predicted by measuring the respiratory rate together with the ORP value. Even when the amount of glucose fluctuates due to hydrogen peroxide contamination, microbial growth can be predicted by measuring the respiration rate together. Even in a system to which a pH adjuster is added, microbial growth can be predicted by measuring the respiration rate together with the amount of organic acid or pH.
  • the measurement accuracy of the respiration rate may be lowered, but microbial growth can be predicted by measuring the amount of calcium ions.
  • microbial growth can be predicted by measuring the respiration rate together with the electrical conductivity.
  • a system containing a lot of bubbles it is difficult to predict microbial growth by measuring only the dissolved oxygen amount, but microbial growth can be predicted by measuring the respiratory rate together.
  • starch it is difficult to predict microbial growth by measuring only the amount of starch, but microbial growth can be predicted by measuring the respiration rate together.
  • the location where the water quality parameter is measured is not particularly limited, but it is preferably 1 or more types selected from the group consisting of a raw material system, a preparation / papermaking system, a recovery system, and a drainage system, more preferably 2 More than a seed system.
  • a raw material system a preparation / papermaking system
  • a recovery system a recovery system
  • a drainage system more preferably 2 More than a seed system.
  • the measurement value of the water quality parameter is not particularly limited, but can be browsed at a remote location via the Internet through a server, and remote control based on the received measurement value may be performed. Further, in a remote place, there may be means for outputting the measurement value, the mode of water treatment (for example, the amount of added bactericidal agent), and the result (for example, presence or absence of paper break).
  • Example 1 Using the papermaking system 10 shown in FIG. 1, the slime suppression method according to the examples and comparative examples was carried out.
  • an Example and a comparative example were common about the following conditions, and differed in the timing of the measurement of an oxidation reduction potential and an electrical conductivity, and addition of an oxidizing disinfectant.
  • the oxidizing disinfectant is periodically added at a frequency of once every hour, and in the example, the oxidation-reduction potential and the electrical conductivity are measured at a frequency of once every 15 minutes.
  • the amount of the oxidizing bactericide added was adjusted according to the increase / decrease.
  • FIG. 3 shows changes in the oxidation-reduction potential and electrical conductivity in the seed box 26 in the comparative example
  • FIG. 4 shows changes in the oxidation-reduction potential and electrical conductivity in the seed box 26 in the example.
  • the oxidation-reduction potential decreased rapidly, the electrical conductivity increased rapidly, and paper breaks occurred frequently.
  • the oxidation-reduction potential and the electrical conductivity followed a substantially constant transition regardless of the change in the amount of DIP, and no paper break was observed.
  • the amount of the oxidizing bactericide used was 20% smaller than that of the comparative example.
  • Example 2 Using the papermaking system 10A shown in FIG. 2, the slime suppression method according to the examples and comparative examples was carried out.
  • an Example and a comparative example were common about the following conditions, and differed in the timing of the measurement of an oxidation reduction potential and an electrical conductivity, and addition of an oxidizing disinfectant.
  • the oxidizing disinfectant is periodically added at a frequency of once every 4 hours, and in the example, in addition to the addition at a frequency of once every 4 hours, the oxidation-reduction potential in the wet broke tank 45 and The amount of the oxidizing bactericide added was adjusted according to the increase or decrease in the measured electric conductivity.
  • FIG. 5 shows changes in the oxidation-reduction potential and electrical conductivity in the seal pit 41, the wet broke tank 45 and the CB tank 46 in the comparative example, and the oxidation-reduction in the seal pit 41, the wet broke tank 45 and the CB tank 46 in the embodiment.
  • the transition of the electric potential and the electric conductivity in the wet broke tank 45 is shown in FIG.
  • Example 3> Using the papermaking system shown in FIG. 2, the slime suppression method according to the examples and comparative examples was carried out.
  • an Example and a comparative example are common about the following conditions, and differ in the timing of two measurements among oxidation-reduction potential, electrical conductivity, foam height, and broke turbidity, and the addition timing of an oxidizing disinfectant. It was.
  • Oxidizing disinfectant Liquid prepared by mixing 1.3% by mass ammonium bromide aqueous solution and 2.0% by mass sodium hypochlorite aqueous solution immediately before the addition.
  • an example was performed over 4 days, and then a comparative example was performed over 4 days.
  • the oxidizing disinfectant is periodically added at a frequency of once every 4 hours.
  • the oxidation-reduction potential ORP meter 67 in the CB tank 46. The amount of the oxidizing disinfectant added is adjusted according to the increase / decrease of the measured value of the electrical conductivity at the seal pit 41, the height of the foam at the seal pit 41, and the turbidity measured at the broke tank 23. did.
  • the threshold values were 250 mV for the redox potential, 150 mS / m for the electrical conductivity, 8 cm for the bubble height, and 300 NTU for the broke turbidity, and when both of the measured values exceeded the threshold (electrical conductivity Only when the above threshold values were exceeded for foam height and broke turbidity, and when the oxidation-reduction potential was below the above threshold values), the addition amount of the oxidizing disinfectant was increased until both did not exceed the threshold values.
  • (A) shows the transition of each water quality parameter in the example
  • (B) shows the transition of each water quality parameter in the comparative example.
  • 26 paper breaks occurred in 4 days whereas in the example, only 8 paper breaks occurred in 4 days.

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
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PCT/JP2011/077191 2010-11-25 2011-11-25 紙を製造する方法 WO2012070644A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2011552239A JP5655796B2 (ja) 2010-11-25 2011-11-25 紙を製造する方法
KR1020137012532A KR101543733B1 (ko) 2010-11-25 2011-11-25 종이를 제조하는 방법
CN201180056193.7A CN103370471B (zh) 2010-11-25 2011-11-25 制造纸的方法

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Application Number Priority Date Filing Date Title
JP2010261914 2010-11-25
JP2010-261914 2010-11-25

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JP2021505787A (ja) * 2017-12-08 2021-02-18 ケミラ・オーワイジェイＫｅｍｉｒａ Ｏｙｊ 製紙もしくは板紙製造プロセスの微生物の状態を予測または制御するための方法
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JP2017106157A (ja) * 2012-06-05 2017-06-15 バックマン・ラボラトリーズ・インターナショナル・インコーポレーテッドＢｕｃｋｍａｎ Ｌａｂｏｒａｔｏｒｉｅｓ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｉｎｃｏｒｐｏｒａｔｅｄ パルプ中のデンプンを保存する方法、並びにカルシウムの沈殿及び／又はスケーリングを制御する方法
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JP2017506707A (ja) * 2014-02-27 2017-03-09 エコラブ ユーエスエイ インク 紙の製造において殺生物剤を使用するリサイクル繊維の保存法およびリサイクル繊維を用いた紙の製造法
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JP7393009B2 (ja) 2017-12-08 2023-12-06 ケミラ・オーワイジェイ 製紙もしくは板紙製造プロセスの微生物の状態を予測または制御するための方法
JP2021505787A (ja) * 2017-12-08 2021-02-18 ケミラ・オーワイジェイＫｅｍｉｒａ Ｏｙｊ 製紙もしくは板紙製造プロセスの微生物の状態を予測または制御するための方法
JP7072436B2 (ja) 2018-04-26 2022-05-20 アクアス株式会社 製紙設備の環境臭気抑制方法、および、製紙工場の環境臭気抑制方法
JP2019189974A (ja) * 2018-04-26 2019-10-31 アクアス株式会社 製紙設備における殺菌剤の添加方法
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US11857939B2 (en) 2020-09-04 2024-01-02 Buckman Laboratories International, Inc. Predictive systems and methods for proactive intervention in chemical processes
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