KR20130096710A - Method for producing paper - Google Patents

Abstract

(식 중에서 R₁은 수소원자 또는 메틸기, R₂ 및 R₃은 각각 탄소수 1∼4의 알킬기, R₄는 수소원자, 탄소수 1∼4의 알킬기 또는 벤질기이며, Y는 Ｏ 또는 ＮＨ이고, n은 2∼5이며, Z￣는 할로겐 이온, 설페이트 이온, 포스페이트 이온, 보레이트 이온 또는 유기산 음이온이다.)It provides a method of making paper which reduces the load on drainage and also obtains paper and cardboard of constant lipids. A polymer having a slime control agent and a cationic functional group is added to the papermaking process water containing starch. At this time, the polymer having a cationic functional group is a polymer of a monomer alone represented by the following general formula (A) or a copolymer of this monomer and acrylamide or styrene, and a monomer unit derived from a monomer represented by the following general formula (A) 20 to 100 mol%, at least one of the diaryldimethylammonium halide polymer, polyethyleneimine and epichlorohydrin polymer, and the intrinsic viscosity (η) in a 25 ° C 1N saline solution is 0.05 to 5 d. Use / g

(Wherein R ₁ is a hydrogen atom or a methyl group, R ₂ and R ₃ are each an alkyl group having 1 to 4 carbon atoms, R ₄ is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a benzyl group, Y is O or NH, n Is 2 to 5, and Z 'is a halogen ion, sulfate ion, phosphate ion, borate ion or organic acid anion.)

Description

Manufacturing method of paper {METHOD FOR PRODUCING PAPER}

The present invention relates to a method for producing paper and cardboard. More specifically, the present invention relates to a technique for improving the water quality of wastewater discharged from a paper manufacturing process using starch.

In the paper manufacturing process, starch is used as a paper strength enhancer, surface strength enhancer, or an interlayer adhesive for maintaining paper strength and printing titration. In recent years, the use rate of old paper is increasing when paper is manufactured. For example, most of old paper used, such as a coating layer of old paper and a paste of old corrugated paper, contains starch.

For this reason, papermaking process water contains a large amount of starch, but when these starches are used as a nutrient source and microorganisms such as bacteria multiply, the walls of the pipes and tanks and the filter phase are filtered. A biofilm called "slime" is formed on the back. This slime is a viscous, gelatin-like film formed on a solid surface containing both aquatic and non-living organisms. It is known to cause slime disorders, such as 紙質 劣 化).

In addition, microorganisms included in slime are bacteria with high ability to produce amylase, the most of which is starch degrading enzyme. Therefore, when slime is formed, the amylase released from the papermaking process water hydrolyzes the starch attached to the pulp fiber or insoluble starch particles dispersed in the water, thereby producing glucose. And organic acids such as formic acid, lactic acid, acetic acid and butyric acid.

Since glucose and organic acids have low molecular weights, they are difficult to remove, which is a factor in increasing drainage load. In addition, since the added starch is removed from the pulp slurry by the action of amylase for the purpose of improving paper strength, printing titration, etc., it is necessary to add, spray, or apply new starch to produce it. It also leads to an increase in costs.

Therefore, in the paper manufacturing process, the slime control agent which suppresses slime formation is generally used (for example, refer patent documents 1-4). Furthermore, in the conventional method for producing paper in which starch is added to raw materials, a method for producing paper in which amylase activity is measured at a predetermined point in the manufacturing process and a slime control agent is added based on the measured value is also proposed. (Refer patent document 5). According to the manufacturing method of the paper described in this patent document 5, quality deterioration etc. by a slime disorder in the starch use paper can be prevented.

On the other hand, the technique which prevents the slime disorder in a papermaking process is also proposed by adding predetermined amount of water soluble cation polymer and cation surfactant (refer patent document 6). In addition, from the viewpoint of reducing the amount of starch used, a technique using a cationic polymer instead of or in combination with cationic starch as a fixing agent of anionic size agent has been proposed. (See patent document 7).

Japanese Patent Laid-Open No. 6-009307 Japanese Patent Laid-Open No. 10-120509 Japanese Patent Laid-Open No. 2003-012413 Japanese Patent Publication No. 2004-537412 Japanese Patent Laid-Open No. 2008-169499 Japanese Patent Laid-Open No. 8-260392 Japanese Patent Laid-Open No. 2002-249995

In recent years, the use of starch has rapidly increased in the manufacturing process of paper, and as a result, the problem that the load on drainage by starch and starch decomposition products becomes high, and the cost of drainage treatment is increasing. . In addition, in order to replenish starch removed from the pulp slurry due to the action of amylase by microorganisms in the slime, starch and an intensifier are added to obtain a constant lipid, further increasing the drainage load. At the same time, the cost of manufacturing is increasing.

However, a simple slime prevention treatment such as the method described in the above-mentioned Patent Document 6 cannot inhibit amylase activity, and thus prevents a decrease in the operability such as defects or complexes caused by slime. Even if it can, it cannot suppress starch degradation by amylase. In addition, even when the cationic polymer is used alone, as in the method described in Patent Document 7, a sufficient starch adsorption effect is not obtained and the intelligence expression effect is not obtained under the situation where starch decomposition occurs.

The present invention thus aims to reduce the load on drainage and to provide a process for producing paper from which paper and cardboard of constant lipids are obtained.

The manufacturing method of the paper which concerns on this invention is equipped with the process of adding a slime control agent to the papermaking process water containing a starch, and the process of adding the polymer which has a cationic functional group to the said papermaking process water, The said cationic As a polymer provided with a functional group, it is a polymer of the monomer only represented by following General formula (1), or a copolymer of the monomer represented by following General formula (1), and acrylamide or styrene, and is represented by following General formula (1) Containing 20 to 100 mol% of monomer units derived from the monomer, a polymer having a diaryldimethylammoniumhalide unit, a polymer having a polyethyleneimine and an epichlorohydrin unit At least one selected from the group Reamer, and also the intrinsic viscosity (η) in the 25 ° 1N saline solution of the seed used in that 0.05~5dl / g.

In formula (1), R ₁ is a hydrogen atom or a methyl group, R ₂ and R ₃ are each an alkyl group having 1 to 4 carbon atoms, R ₄ is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a benzyl group, and Y is O or NH, n is 2 to 5, and Z 'is a halogen ion, sulfate ion, phosphate ion, borate ion or organic acid anion. In addition, paperboard is contained in the "paper" manufactured in this invention.

In the present invention, since a specific polymer having a slime control agent and a cationic functional group is added to the papermaking process water, the slime control agent suppresses the slime growth, and the polymer adsorbs the starch during the paper making process. Settles in paper stock.

In this paper production method, the slime control agent may be added to a raw material slurry.

In that case, the amylase activity or the redox potential of the paper-making process water may be measured, and the slime control agent may be further added based on the measurement result.

As a slime control agent, the mixture of an oxidizing agent and an ammonium salt can be used, for example.

What is necessary is just to add the polymer provided with the said cationic functional group so that solid content concentration in the said papermaking process water may be 0.1-100 mg / L, for example.

According to the present invention, since a specific polymer having a slime control agent and a cationic functional group is added to the papermaking process water, it is possible to suppress the degradation of lipids and to reduce the load on drainage.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated in detail. In addition, this invention is not limited to embodiment described below.

In the paper manufacturing method according to the embodiment of the present invention, a decomposition suppression step of adding a slime control agent to papermaking process water containing starch, and an adsorption step of adding a polymer having a cationic functional group to the papermaking process water Conduct. In addition, the order which performs these decomposition suppression process and adsorption process is not specifically limited, Either may be ahead of you, and you may carry out simultaneously.

[Decomposition suppression process]

In the decomposition suppression step, a slime control agent is added to the papermaking process water to suppress the decomposition of the starch adsorbed to the pulp fiber or the starch dispersed in the papermaking process, for example, by the microorganism amylase contained in the slime. As a result, it is possible to prevent the growth of slime and to inhibit the degradation of starch by amylase.

The slime control agent used in this step may be one that does not decompose starch, and may be appropriately selected from known compounds. Specific examples thereof include bromoamide-based compounds such as 2,2-dibromo-3-nitrilopropionamide and n-bromoacetamide, 1,2 Bromoacetic acid ester type compounds, such as -bis (bromoacetoxy) ethane and 1, 4-bis (bromoacetoxy) -2-butene, 2-methyl-4- isothiazolin-3-one (2- methyl-4-isothiazolin-3-on), 5-chloro-2-methyl-4-isothiazolin-3-one or a metal salt thereof and 4,5-dichloro-2-octyl4-isothiazolin-3-one Bromonitroalcohol compounds such as isothiazolone compounds, 2-bromo-2-nitro-1,3-propanediol and 2,2-dibromo-2-nitroethanol and esters thereof, 4,5- Dichloro-1,2-dithiolane-3-one (4,5-dichloro-1,2-dithiolane-3-on), 3,3,4,4-tetrachlorotetrahydrothiophene-1,1-diox Cyclic sulfur compounds such as seeds (3,3,4,4-tetrachlorotetrahydrothiophene-1,1-dioxide) Renbisthiocyanate, 5-chloro-2,4,6-trifluoroisophthalonitrile (5-chloro-2,4,6-trifluoroisophthalonitrile), orthophtalaldehyde, dichloroglyoxime, Hydantoin compounds such as 5,5-dimethylhydantoin, N-chloro-5,5-dimethylhydantoin and 1-bromo-3-chloro-5,5-dimethylhydantoin, The reactant sterilizer obtained by mixing an oxidizing agent and ammonium, etc. are mentioned, These may be used independently, but it can also use combining several compound.

Among these slime control agents, it is particularly preferable to use inorganic slime control agents. As a specific example of an inorganic slime control agent, the mixture of an oxidizing agent and an ammonium salt, the compound which produces hypochlorous acid and hypobromic acid, etc. are mentioned, for example.

Although the oxidizing agent used here is not specifically limited, A chlorine-type oxidizing agent is preferable, More preferably, it is sodium hypochlorite. Moreover, an ammonium salt is not specifically limited, either, Ammonium halides, such as ammonium bromide, ammonium sulfate, ammonium nitrate, etc. can be used, It is especially preferable to use ammonium bromide. By using such a reactant fungicide, it is possible to economically and inexpensively suppress the growth of slime in subsequent steps.

On the other hand, the position where the slime control agent is added is not particularly limited, and a place where slime propagation tends to occur or a place where slime tends to proliferate can be appropriately selected and added. However, it is preferable that the slime control agent be included in the raw material slurry containing a lot of starch, such as at least old paper raw material or process loss paper (that was added or coated with starch but could not be shipped as a product).

In addition, when the slime control agent is not added to the raw material slurry and the effect cannot be maintained until the subsequent step, for example, the slime control agent may be appropriately added based on the water quality measurement result of the papermaking process. For example, when the water used in the papermaking process is reused for dilution of raw materials, the slime control agent may be added to the dilution water again if necessary even when the slime control agent is added in the manufacturing process. . Accordingly, the effect of inhibiting the growth of slime can be further enhanced.

In the case where the slime control agent is further added here, the addition position is preferably set such that starch decomposition is suppressed in all subsequent steps. The slime control agent may be added continuously, but is preferably added intermittently as necessary while managing the water quality of the papermaking process water such as amylase activity or Oxidation-reduction Potential (ORP).

Although the addition amount and the frequency | count of addition of a slime control agent at this time are not specifically limited, either, For example, 2-50 mg / L of addition amount is 1-48 times / day. The addition amount and the frequency | count of addition of this slime control agent can be set suitably based on the water quality measurement result of papermaking process water, such as amylase activity or ORP.

For example, in the case of controlling the amount and the number of additions of the slime control agent on the basis of amylase activity, the amylase activity of the papermaking process water collected throughout the manufacturing process is regularly and preferably continuously measured and monitored. It is good to increase the addition amount of a slime control agent when it exceeds the predetermined threshold. Although the threshold value at this time is not specifically limited, For example, it can be 0.002 CPa / g.

On the other hand, in the case of managing the amount and the number of times of addition of the slime control agent on the basis of ORP, the growth of slime is monitored by measuring the ORP of the papermaking process water regularly, preferably continuously, and the measured value is lower than the predetermined threshold. In this case, the amount of slime control agent may be increased. At this time, a slime control agent may be added so as to maintain the ORP value of the papermaking process water in a positive aerobic condition, thereby inhibiting starch decomposition by microorganisms promoted under anaerobic conditions.

In addition, in the case of continuously measuring the ORP of the papermaking process water, it is possible to grasp the oxidative decomposition of starch due to the introduction of strong oxidants. Although the value of this OPR is not specifically limited, In general, it is preferable to keep it in the range of 0- + 500mV.

Thus, the slime growth can be efficiently suppressed by setting the addition amount and the frequency | count of addition of a slime control agent based on the water quality measurement result of a papermaking process water.

Adsorption process

In the adsorption step, the starch dispersed in the papermaking step is adsorbed by a polymer having a cationic functional group added to the papermaking process water and fixed to the paper stock. This can reduce the amount of starch shifted to multiples.

In this step, the polymer having a cationic functional group, which is (a) a polymer of a monomer alone represented by the following general formula (2) or a polymer of this monomer and acrylamide or styrene, which is derived from a monomer represented by the following general formula (2) At least one selected from the group consisting of 20 to 100 mol% of monomer units, (b) a polymer having a diaryldimethylammonium halide unit, (c) a polyethyleneimine and a polymer having an (d) epichlorohydrin unit One kind of polymer and one having a intrinsic viscosity (η) in 1 N saline at 25 degrees C is used.

In formula (2), R ₁ is a hydrogen atom or a methyl group, R ₂ and R ₃ are each an alkyl group having 1 to 4 carbon atoms, R ₄ is a hydrogen atom, an alkyl group or benzyl group having 1 to 4 carbon atoms, and Y is O or NH, n is 2-5, Z 'is a halogen ion, a sulfate ion, a phosphate ion, a borate ion, or an organic acid anion.

When a polymer having a cationic functional group has an intrinsic viscosity η of less than 0.05 dEL / g, sufficient adsorption effect on the pulp fibers is not obtained, and the amount of chemicals used is increased. In addition, the addition of a large amount of the drug causes deterioration of the operability such as filtrate and deterioration of paper quality. Intrinsic viscosity (eta) prescribed | regulated here is the value computed using the Canon Penske type | mold viscometer and measuring fall time, and using the formula of Hug lg Ni nis and the formula of the figure from the measured value.

A polymer having a cationic functional group is a copolymer of the monomer represented by the formula (2) with acrylamide or styrene, and has a monomer content of less than 20 mol% derived from the monomer represented by the formula (2). When is used, sufficient adsorption effect on the pulp fibers is not obtained. As a result, the amount of chemicals used increases, leading to a decrease in operability, such as deterioration of freeness and paper quality. Therefore, in the case of using a copolymer of the monomer represented by the formula (2) with acrylamide or styrene as the polymer having a cationic functional group, the content of the monomer unit derived from the monomer represented by the formula (2) is 20 mol. The thing of% or more is used.

Although the addition position of the polymer provided with this cationic functional group is not specifically limited, Although it can set suitably according to the objective, it is preferable to add continuously to the place containing much starch. For example, in order to reduce the drainage load, it is preferable to add to the cloudy water recovery process discharged from the papermaking process, and to add to the raw material line of the papermaking process for the purpose of improving the intelligence. .

The addition amount of the polymer having a cationic functional group can be appropriately set according to the starch concentration in the papermaking process water or the properties of the raw material, but it is preferable to add the polymer concentration so that the polymer concentration is 0.1 to 100 mg / L as the solid content concentration in the papermaking process water. And, more preferable solid content concentration is 0.5-50 mg / L. As a result, the starch contained in the process water is adsorbed, and the effect of reducing the drainage load due to the improvement of lipids and the decrease of the starch concentration in water is obtained.

In the manufacturing method of the paper of this embodiment, in addition to the above-mentioned polymer which has a slime control agent and a cationic functional group, for example, a sulfuric acid band, a size agent, an intelligence enhancer, and a yield / freeness improver are added. You may also do it.

As described in detail above, in the paper manufacturing method of the present embodiment, since a specific polymer having a slime control agent and a cationic functional group is added to the papermaking process water, not only the growth of the slurry is suppressed but also the drainage The amount of starch introduced can also be reduced. Thereby, since the quantity of the starch contained in waste water and the organic substance component derived from the decomposition | disassembly product reduces, COD of waste water can be kept low. As a result, it is also possible to proceed with saving water to further reduce the water source unit in the paper manufacturing process, thereby preventing out-of-system leakage of the humidified paper manufacturing process water in addition to reducing the water cost. Energy saving effect by can be expected.

In addition, according to the paper manufacturing method of the present embodiment, it is possible to keep the starch in the papermaking process water in the paper raw material, so that the amount of the starch or the strength enhancer added can be further reduced. As a result, paper products of equivalent strength can be produced with less starch amount than before.

Example

EMBODIMENT OF THE INVENTION Hereinafter, the effect of this invention is concretely demonstrated to the Example and comparative example of this invention. In the present Example, the environmental load reduction effect and the performance of the paper manufactured when this invention is applied by the method shown below were evaluated.

<Preparation of test pulp slurry>

330 g of old corrugated cardboard was dispersed in 15 L of tap water, dissociated and beaten with a beater, and a pulp slurry (standard Canadian freeness: CSF = 315 ml) having a solid content concentration of 2% by mass was dissolved. It prepared.

And starch adsorption evaluation used this pulp slurry as it is, and in other evaluation tests, what added 2 mass% starch aqueous solution to 15 L of this solids concentration 2 mass% pulp slurry was made into the pulp slurry for a test. At this time, the starch used the reagent grade manufactured by Kishida Chemical. The degree of anionization by the colloidal equivalent measurement of this starch was -0.15 milli / g, and showed slightly anionicity. In addition, the starch was melt | dissolved by the hot plate stirrer by heat, and it prepared it by the 2 mass% starch solution.

<Preparation of Sheets>

From the above-mentioned pulp slurry for test, a paper sheet having a basis weight of 120 g / m ² was prepared in accordance with the method specified in JIS P 8029.

<Evaluation of Adsorption of Starch>

The test slurry before adding starch was prepared so that the solid content concentration might be 2000 mg / L. Thereafter, the starch pool solution was added so that the starch concentration in the slurry became 100 g / L while stirring the slurry at 150 rpm, and then each polymer was added to measure the starch concentration in water and the solubility COD (Mn).

<Measurement of Starch Concentration in Water, Amylase Activity, and COD (Mn)>

To 3.2 ml of the filtrate suctioned and filtered with 5 A filter paper, 10-fold dilute hydrochloric acid: 4 ml, 0.002N iodine solution: 0.4 ml, and pure water: 0.4 ml were added, and a spectrophotometer was used. The absorbance of 580 nm was measured. And the starch concentration was computed from the analytical curve which was prepared based on the starch sample of the known concentration.

In addition, amylase activity was measured for the filtrate using a commercially available amylase assay kit (manufactured by Megazyme International Ireland). In addition, the measurement of COD (Mn) was performed based on the measuring method in 100 degreeC prescribed | regulated to JISW0102 using the supernatant liquid of the papermaking process water.

<Measurement of starch concentration in paper and strength of paper>

Sewage paper: 1.0 g of water was immersed in 50 ml of pure water, which was soaked in hot water of 90 degrees, and allowed to stand for 30 minutes to extract hot water from the starch contained in the paper. And starch concentration in water was computed according to the above-mentioned method, and this was made into the starch concentration in paper. In addition, the evaluation of the strength of the paper measured the burst strength based on the method prescribed | regulated to JIS P 8112 using the sheet paper.

<Preparation of slime control agent>

Ammonium sulfate and sodium hypochlorite were mixed at a molar ratio of 1: 1 to prepare a slime control agent having a chlorine equivalent concentration of 1000 mg / L.

[Addition Effect of Slime Control Agent]

First, the test pulp slurry prepared by the method described above was allowed to stand for 3 days under a temperature condition of 30 ° C., and 20 mg / L of slime control agent was added to the test pulp slurry at a frequency of once / day, and the temperature condition was 30 ° C. After standing for 3 days, the difference between the water quality and the number of bacteria was confirmed. The results are shown in Table 1 below.

Day 0
After three days of politics
Addition of Slime Control
－
none
has exist
ＯＲＰ （ｍＶ）
+24
-320
+120
Number of bacteria (pieces / MM)
1.5 × 10 ^７
2.1 × 10 ^８
1.0 × 10 ³
Amylase Activity (CＵ / g)
0.0004
0.0041
0.0006

As shown in Table 1, in the slurry without addition of the slime control agent, microorganisms proliferated, the ORP value decreased, and the amylase activity increased.

[Addition Effect of Polymer Having Cationic Functional Group]

Next, the starch adsorption test described above was carried out using polymers A to H shown in Table 2 below. The results are shown in Table 3 below. In addition, polymer A (DAM / ST) in Table 2 is dimethylaminoethyl methacrylate / styrene, and polymer B (DAM / AM) is dimethylaminoethyl methacrylate / acrylamide, and polymer C (FIOXY-DAMMAC). Is polydiaryldimethylammonium chloride, polymer D (EMA / EiI) is dimethylamine / epichlorohydrin, polymer E (PEI) is polyethyleneimine, polymer F (DAA / Am) is dimethylaminoethylacrylate / acrylamide, Polymer G (DAM) is dimethylaminoethyl methacrylate, and polymer H (AA / AM) is acrylic acid / acrylamide.

Polymer
Intrinsic viscosity （η）
Estimated molecular weight
Monomer A ０．０９ 200,000 DAM / St = 50/50 mol% B 3 20 million DAM / AAM = 50/50 mol% C 0.5 10 million Poly-DADMAC = 100 mol% D 0.1 25 million EMA / Epi Polycondensation E 0.1 20 million PEI F 13 150 million DAA / AAm = 15/85 mol% Ｇ 13 150 million DAM = 100 mol% H 17 20 million AA / AAm = 20/80 mol%

Type of polymer Addition amount
(Mg / L) Underwater
Starch concentration
(Mg / L) Starch
Adsorption rate (%) COD （Ｍｎ）
(Mg / L) COD （Ｍｎ）
Reduction rate (%)
Reference Example adding
none
0
94
-
55
- Example 1 A 2.5 60 36 37 33 Example 2 A 5 49 48 30 45 Example 3 B 2.5 57 27 35 36 Example 4 B 5 48 49 29 47 Example 5 C 2.5 44 53 26 53 Example 6 C 5 41 56 27 51 Example 7 D 2.5 65 31 40 27 Example D 5 55 41 32 42 Example 9 E 2.5 72 23 42 24 Example 10 E 5 54 43 33 40 Comparative Example 1 F 2.5 89  5 54  2 Comparative Example 2 F 5 84 11 53  4 Comparative Example 3 Ｇ 2.5 89  5 55  0 Comparative Example 4 Ｇ 5 79 16 49 11 Comparative Example 5 H 2.5 90  4 55  0 Comparative Example 6 H 5 89  5 55  0

The COD reduction rate shown in the said Table 3 is the value calculated | required by following formula (1).

As shown in Table 3, Examples 1 to 10 using polymers A to E had superior starch adsorption and COD reduction effects as compared to Comparative Examples 1 to 6 using polymers F to H.

[Addition Effect of Polymer Having a Slime Control Agent and a Cationic Functional Group]

Furthermore, the polymer A shown in the said Table 2 was added to the sample after standing still for 3 days used for evaluation of the addition effect of the said slime control agent, and the effect was evaluated. The results are shown in Table 4 below.

Slime
Control Polymer
Addition amount
(Mg / L) Underwater
Starch concentration
(mg / L) COD (Ｍｎ)
(Mg / L) Out of paper
Starch
(g ／ ｋｇ) Non-rupture strength
(JPP · m ² / g) Example 11 U 5 310 230 67.2 3.32 Example 12 U 10 230 189 105 3.85 Comparative Example 7 U 0 430 280 19.5 2.51 Comparative example radish 0 5 67 10.8 2.06 Comparative example radish 5 5 70 10.8 2.02 Comparative Example 10 radish 10 5 70 10 2.05

As shown in Table 4, Examples 11 and 12 in which the slime control agent was added to inhibit starch decomposition by amylase derived from microorganisms, and the starch was adsorbed by the cationic polymer and settled on the grass paper were slime. Compared with Comparative Examples 7 to 10 in which no one of the polymer having the control agent or the cationic functional group was added, the amount of starch and the COD in the water were significantly reduced. In addition, the sheet paper obtained in Examples 11 and 12 had more starch amount and higher strength than the sheet paper obtained in Comparative Examples 7 to 10.

From the above results, it was confirmed that the present invention can reduce the load on drainage water without lowering lipids.

Claims (5)

Adding a slime control agent to the papermaking process water containing starch;
Adding a polymer having a cationic functional group to the papermaking process water
Respectively,
As a polymer having the cationic functional group, a polymer of a monomer alone represented by the following formula (A) or a copolymer of a monomer represented by the following formula (A) with acrylamide or styrene A polymer having 20 to 100 mol% of monomer units derived from a monomer represented by the following general formula (A), and a diaryl dimethyl ammonium halide unit, and polyethyleneimine (polyethylene imine) and at least one polymer selected from the group consisting of polymers having epichlorohydrin units, and in a 1N saline solution at 25 degrees Celsius. The manufacturing method of the paper using the thing whose intrinsic viscosity ((eta)) is 0.05-5 d? / G.

Wherein R ₁ is a hydrogen atom or a methyl group, R ₂ and R ₃ are an alkyl group having 1 to 4 carbon atoms, R ₄ is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a benzyl group, Y is O or NH, and n is 2 to 5, and Z 'is a halogen ion, sulfate ion, phosphate ion, borate ion or organic acid anion.
The method of claim 1,
The slime control agent is added to a raw material slurry.
The method of claim 2,
Amylase activity or redox potential of the paper-making process water is measured, and the slime control agent is further added based on the measurement result.
The method according to any one of claims 1 to 3,
A paper manufacturing method characterized by using a mixture of an oxidizing agent and an ammonium salt as a slime control agent.
The method according to any one of claims 1 to 4,
A method for producing paper, wherein the polymer having the cationic functional group is added so as to have a solid content concentration of 0.1 to 100 mg / L in the papermaking process water.