JP6281453B2 - An improved system for producing recycled pulp from waste paper. - Google Patents

Description

  The present invention relates to a method for producing recycled pulp using waste paper.

  In recent years, it has been desired that more waste paper is used for both paper and paperboard because of the reduction of waste and increasing interest in environmental problems. At the time of using waste paper, studies have been made on the point that the strength is inferior compared to the case of using the manufactured paper product virgin pulp, and the appearance and operability are improved by removing foreign substances contained in the waste paper. .

  For example, Patent Document 1 provides a method for producing used paper pulp for a paperboard back layer that improves the surface properties and strength of paperboard using used paper pulp containing coated paper without depending on methods such as addition or application of chemicals. It is being studied as an issue to do. And in the preparation method of the used paper pulp containing the coated paper, the used paper pulp separated by the pulper is kneaded and classified, and further beaten as necessary. A manufacturing method is proposed. Moreover, in patent document 2, even if selection of raw material used paper is not enough, it makes it the subject to provide the manufacturing method of used paper pulp which can manufacture used paper pulp with few adhesive foreign materials. Then, it is proposed to sequentially perform a study waste paper disaggregation process, a foreign matter removal process, a coarse dust removal process, a dehydration concentration process, a dilution process, a fine dust removal process, and a cleaning process.

  On the other hand, a field asymmetric ion mobility spectrometer (FAIMS) is attracting attention as a technique for detecting and analyzing chemical substances with high sensitivity. In this device, by changing the DC voltage and AC voltage applied to the sensor, the change in mobility of the ionized chemical substance is detected by a fine filter, and the chemical substance is specified by the difference in the detection results. Is possible (see Patent Document 3). In addition, in this analyzer, attempts have been made to measure microorganisms including viruses and bacteria (see Patent Document 4).

Japanese Patent Laid-Open No. 11-43880 JP 2013-159865 A International Publication WO2012 / 056730 International Publication WO2013 / 035306

  According to the study by the present inventors, multi-colored spots may be seen when white paperboard containing waste paper as a raw material has passed for several months at room temperature. For this reason, in particular, white paperboard for daily necessities such as paper containers and board for food, food, medicine boxes, etc., which are highly safety-oriented for consumers, have caused damaged paper and complaints. Therefore, when the present inventor analyzed in detail, the red spots include a red sublimation dye called Disperse Red 60, and the blue spots include a blue sublimation dye called Disperse Blue 14, It has been found that anthraquinone skeleton compounds having different substituents are included. These dyes are dye components used for sublimation transfer paper.

  On the other hand, the raw material waste paper may contain microorganisms, microorganism conversion products, foamed sheets, and adhesive foreign substances in addition to sublimation transfer paper. These can also cause deterioration in appearance and off-flavor in the final product. However, in either case, as a countermeasure, if it is noticed, it can be removed manually and the order of foreign matter is low (for example, one A4 size paper is included in one ton of used paper). There was no practical technique to effectively remove the slag.

The present invention provides the following.
[1] A method for producing recycled pulp using waste paper as a raw material through a disaggregation treatment step,
A production method comprising a step of analyzing a component derived from a foreign substance in a gas collected from waste paper, a disaggregation treatment step, or recycled pulp.
[2] A method for producing paper or paperboard using waste paper as a raw material, and through a papermaking process,
A manufacturing method comprising a step of analyzing a component derived from a foreign substance in a gas collected from waste paper, a disaggregation treatment step, a recycled pulp or a papermaking step.
[3] The production method according to 1 or 2, wherein the foreign material is any one selected from the group consisting of sublimation transfer paper, microorganisms, microorganism conversion products, foam sheets, and adhesive foreign materials.
[4] The production method according to 1 or 2, wherein the foreign substance-derived component is any one selected from the group consisting of a sublimable dye compound, a musty odor-causing substance, and a foam sheet-derived component.
[5] The component derived from the foreign matter
1,4-diamino-2,3-diphenoxy-9,10-anthracene dione (C.I.Disperse Violet 26), 5- bromo ^{-Δ 2,2 '(3H, 3'} H) - bi [1H-indole ] -3,3′-Dio (CI Vat Blue 34: CasNo. 6492-73-5), 1-methylamino-4-phenylamino-9,10-anthraquinone (C.I. Disperses Blue 24: Cas No. 3179-96-2), 1,4-bis (isopropylamino) -9,10-anthraquinone (CI Disperse Blue 134), 1,4-dimethylaminoanthraquinone (CI Disperse Blue 14) 4- (diethylamino) azobenzene (CI Solvent Yellow 56), bromide or 1,5-dihydrochloride Xy-4,8-diaminoanthraquinone, 1,4-diamino-2,3-dichloroanthraquinone, 1-amino-4-hydroxyanthraquinone, 1-amino-4-hydroxy-2- (β-methoxyethoxy) -anthraquinone, 1-amino-4-hydroxy-2-phenoxyanthraquinone (CI Disperse Red 60), methyl, ethyl, propyl, butyl ester of 1,4-diaminoanthraquinone-2-carboxylic acid, 1,4-diamino-2 -Methoxyanthraquinone, 1-amino-4-anilinoanthraquinone, 1-amino-2-cyano-4-anilino (or cyclohexylamino) -anthraquinone, 1-hydroxy-2- (p-acetaminophenylazo) -4- Methylbenzene, 3-methyl-4- (nitrophenyl) Any sublimable dye compound selected from the group consisting of azo) -virazolone and 3-hydroxyquinophthalone;
Any mold odor-causing substance selected from the group consisting of 2,4,6-trichloroanisole and 2,4,6-tribromoanisole; and any foam selected from the group consisting of isobutane, isopentane and pentane 5. The production method according to 4, which is any one selected from the group consisting of a sheet-derived component.
[6] The production according to any one of 1 to 5, wherein the analysis is performed by at least one method selected from the group consisting of asymmetric field ion mobility spectrometry, mass spectrometry, and ion mobility. Method.
[7] The production method according to any one of 1 to 6, wherein separation by gas chromatography is performed before analysis.
[8] The manufacturing method according to any one of 1 to 7, wherein the collected gas is pretreated.
[9] The production according to any one of 1 to 8, comprising a step of removing at least a part of waste paper, a disaggregation treatment process product, a regenerated pulp, or a papermaking process product when a component derived from a foreign matter is detected. Method.

[10] A system for producing recycled pulp using waste paper as a raw material through a disaggregation treatment process, and means for analyzing a component derived from a foreign substance in a gas collected from the waste paper, the disaggregation treatment process or the recycled pulp Including the system.
[11] A system for producing paper or paperboard using waste paper as a raw material, through a paper making process, wherein a component derived from a foreign substance in a gas collected from the used paper, a disaggregation process, a recycled pulp or a paper making process A system that includes means for analyzing.
[12] The system according to 10 or 11, comprising means for removing at least a part of waste paper, a disaggregation treatment process product, a regenerated pulp or a papermaking process product when a component derived from a foreign substance is detected.

  According to the present invention, when a specific foreign material is contained in a raw material, it can detect effectively. In addition, it is possible to identify raw material waste paper containing foreign substances, waste paper processed in the middle of processing (for example, waste paper processed by pulper etc.), recycled pulp or paper products, and remove them by appropriate means. Can produce the final product with better quality.

FAIMS analysis chart of gas on waste paper including sublimation transfer paper. A peak peculiar to the red sublimation transfer paper that cannot be seen only with the waste paper was confirmed when only the sublimation transfer paper was analyzed and when a mixture (MIX) of waste paper and sublimation transfer paper was analyzed. The FAIMS analysis chart after performing the peak separation of the gas on the waste paper including the sublimation transfer paper with a short column. A peak peculiar to the red sublimation transfer paper that cannot be seen only with the waste paper was confirmed when only the sublimation transfer paper was analyzed and when a mixture (MIX) of waste paper and sublimation transfer paper was analyzed. The FAIMS analysis chart after carrying out peak separation of the gas on the waste paper which consists of PPC paper containing a sublimation transfer paper with a short column. A peak peculiar to the red sublimation transfer paper that cannot be seen in the case of only PPC paper was confirmed when only the sublimation transfer paper was analyzed. A GC-MS chromatogram of gas generated under a predetermined condition from TCA and TBA which are components of mold odor added to a waste paper sample. TCA and TBA peaks were confirmed. The mass spectrum of the 30.371 minute peak (upper) of the chromatogram in FIG. 4 and the mass spectrum of TCA (lower). Both agreed. The mass spectrum of the peak at 34.609 minutes (upper) of the chromatogram in FIG. 4 and the mass spectrum of TBA (lower). Both agreed. A GC-MS total ion chromatogram of gas generated under a predetermined condition from a used paper sample including a foam sheet. The mass spectrum of the peak at 5.316 minutes (upper) and the GC-MS chromatogram of isobutane (lower) of the chromatogram in FIG. Both agreed. The mass spectrum of the peak at 7.492 minutes (upper) and the mass spectrum of isopentane (lower) of the chromatogram in FIG. Both agreed. The mass spectrum of the peak of 8.163 minutes (upper part) and the mass spectrum of pentane (lower part) of the chromatogram of FIG. Both agreed. Total ion chromatogram of waste paper and foamed sheet (upper), foamed sheet (middle), and used paper (lower). Total ion chromatogram of waste paper sample Mass spectrum of mass ions 210, 212, 195, 197 Mass spectrum of mass ions 329, 331, 344, 346 FAIMS analysis chart of gas collected from humidified waste paper (sublimation transfer paper) FAIMS analysis chart of gas collected from humidified waste paper (sublimation transfer paper)

Unless otherwise indicated, “part” and “%” mean “mass (weight) part” and “mass (weight)%”. The numerical range “a to b” includes the values a and b at both ends unless otherwise specified. Although specific embodiments and examples thereof may be described, the scope of the present invention is not limited thereby.
In addition, the mass (dry solid content amount) in the present invention indicates the mass (absolute dry mass) when dried at 110 ° C. in accordance with JIS P 8225. Unless otherwise specified, it is only pulp fiber. The mass includes other coexisting materials such as ash. That is, the dry solid content of 100 g means that the absolute dry mass is 100 g. In order to determine the dry solid content of a sample having a high water content, such as pulp slurry, prior to the drying at 110 ° C., a Buchner funnel was used. Dehydration may be performed using No. 2 filter paper (which has been obtained in advance with an absolute dry mass).

  The present invention provides a method for producing recycled pulp, paper or paperboard (including white paperboard) using waste paper as a raw material, and a system therefor. The production method of the present invention includes a step of analyzing a component derived from a foreign substance in a gas collected from used paper or in a gas collected during the process.

<Recycled paper>
Used paper refers to paper that can be used as a raw material for papermaking, or paper that can be used, of paper and paper products collected after being used once. The used paper that can be used as a raw material in the present invention is not particularly limited. Waste paper as a raw material includes waste paper from various sources, such as those collected from households, shopping streets / commercial facilities, paper processing factories, or offices (offices). Waste paper used as a raw material is of various varieties, such as newspapers, magazines, cardboard, high-quality paper, medium-quality paper, manila balls, beverage paper packs, packaging kraft paper, paperboard board, etc. Includes paper, remaining paper or recovered waste paper.

  Waste paper is usually compressed and packed into an aggregate of about 1 ton by a compression packing machine (baler) in order to increase transport efficiency when shipping to paper makers. The waste paper used as a raw material in the present invention may be in the form of one sheet, or may be in a form in which at least two or more waste papers are stacked (hereinafter referred to as “used paper aggregate”). The waste paper may be torn.

<Target of analysis>
In the present invention, the analysis target is a component derived from a foreign substance. The foreign matter may be contained in the waste paper raw material and is not particularly limited as long as it is preferably removed, but the present invention is effective for foreign matter that generates a sublimable or volatile component that can be analyzed as a gas. Can be applied. Examples of such foreign substances include, but are not limited to, sublimation transfer paper, microorganisms, microorganism conversion products, foam sheets, and adhesive foreign substances.

[Sublimation transfer paper]
Sublimation transfer paper refers to paper printed with dyes containing a sublimation dye compound, and is mainly used when transferring patterns and characters to polyester fibers, and is sometimes called textile printing or iron printing paper. is there. Dye containing a sublimable dye compound is difficult to remove completely by waste paper processing technology such as washing and bleaching.When it is contained in the raw material of white paperboard, It can appear as red-blue spots on the surface of white paperboard in months.

Examples of the sublimable dye compound derived from sublimation transfer paper to be analyzed by the present invention include, but are not limited to, dyes that sublime or evaporate at atmospheric pressure and about 25 to 260 ° C. More specifically, there are dyes such as azo, anthraquinone, quinophthalone, styryl, di or triphenylmethane, oxazine, triazine, xanthene, methine, azomethine, acridine, diazine, etc., and 1,4-diamino-2,3-diphenoxy 9,10 anthracene dione (C.I.Disperse Violet 26), 5- bromo ^{-Δ 2,2 '(3H, 3'} H) - bi [1H-indole] -3,3'-geo (C. I. Vat Blue 34: Cas No. 6492-73-5), 1-methylamino-4-phenylamino-9,10-anthraquinone (CI Disperses Blue 24: Cas No. 3179-96-2), 1, 4-Bis (isopropylamino) -9,10-anthraquinone (CI Disperse Blue 134) 1,4-dimethylaminoanthraquinone (CI Disperse Blue 14), 4- (diethylamino) azobenzene (CI Solvent Yellow 56), bromide or 1,5-dihydroxy-4,8-diaminoanthraquinone chloride 1,4-diamino-2,3-dichloroanthraquinone, 1-amino-4-hydroxyanthraquinone (CI Disperse Red 60), 1-amino-4-hydroxy-2- (β-methoxyethoxy) -anthraquinone 1-amino-4-hydroxy-2-phenoxyanthraquinone, 1,4-diaminoanthraquinone-2-carboxylic acid methyl, ethyl, propyl, butyl ester, 1,4-diamino-2-methoxyanthraquinone, 1-amino- 4-anilinoanthraquinone, 1-amino No-2-cyano-4-anilino (or cyclohexylamino) -anthraquinone, 1-hydroxy-2- (p-acetaminophenylazo) -4-methylbenzene, 3-methyl-4- (nitrophenylazo) -virazolone And 3-hydroxyquinophthalone. Other examples include dye compounds modified with malachite green, methyl violet, sodium acetate, sodium etalate, sodium methylate, and the like. Furthermore, the derivative | guide_body of the said component is also mentioned.

  Although depending on the analyzer used (described later) and the presence or absence of a concentration step, a sublimable dye compound having a concentration of 1 ppb or more can be detected in the collected gas according to the present invention. An asymmetric field ion mobility spectrometer (FAIMS) has the ability to measure up to several ppts for low molecular volatile components.

[Microorganisms and microorganism conversion products]
In the present invention, microorganisms handled as foreign substances in the waste paper raw material are not particularly limited, and examples include molds, eubacteria, archaea, and eukaryotes (algae, protists, fungi, slime molds). In addition, examples of the foreign matter in the waste paper material include insects and extremely small animals. Although it does not specifically limit in microbial conversion material, The causative substance of the mold odor which the antifungal agent for woods 2,4,6-trichlorophenol (TCP) produced | generated by the action of microorganisms is contained.

  Although it does not specifically limit as an example of the musty odor causative substance which this invention makes analysis, Halogenated anisole can be mentioned. Halogenated anisole refers to a compound in which 1 to 5 halogens such as chlorine are bonded to the 2 to 6 positions of anisole. 2,4,6-Trichloroanisole (TCA), which is one of the halogenated anisole, is a sublimable substance known as a cause of mold odor. TCA is produced by O-methylation of the hydroxyl group of 2,4,6-trichlorophenol (TCP), which is an antifungal agent for wood, by the action of fungi and the like. Also, when the pulp is bleached with chlorine, the phenol of the lignin decomposition product is chlorinated to produce TCP, which may become TCA due to the action of mold or the like. Therefore, when processing waste paper, when using a wooden pallet using TCP, or when the waste paper contains packaging material subjected to chlorine bleaching, TCA is generated in the waste paper, or a paper product manufactured using the TCA It is possible that the paperboard product may have a musty odor. It is also known that the TCA sensory threshold is very low (0.3ppt to 1ppb level).

  Another example of halogenated anisole, 2,4,6-tribromoanisole (TBA), is also a volatile material known to cause mold odor. TBA is produced by O-methylation of 2,4,6-tribromophenol (TBP), which is an antifungal agent for wood used in place of TCP, by the action of fungi and the like.

  Although depending on the analyzer used and the presence or absence of the concentration step, the present invention can detect a musty odor causative substance having a concentration of 0.1 ppb or more in the collected gas.

[Foam sheet]
Examples of the foam sheet-derived component to be analyzed by the present invention include, but are not limited to, isobutane, isopentane and pentane. According to the study by the present inventors, these components are not detected from waste paper containing no foamed sheet (see Examples).

  Although depending on the analyzer used and the presence or absence of the concentration step, the present invention can detect a foam sheet-derived component having a concentration of 1 ppb or more in the collected gas.

[Adhesive foreign matter]
In the present invention, the adhesive foreign matter handled as a foreign matter in the waste paper raw material has the adhesiveness used for paper such as adhesives contained in paper labels and seals, packing tape, etc., and hot melt of magazine back glue. It means the substance you have. Adhesive foreign materials are known to exacerbate the appearance of manufactured paper or paperboard products.

  According to the present invention, it is possible to detect an adhesive foreign substance having a concentration of 1 ppb or more in the collected gas.

<Analytical means>
This invention includes the process of analyzing the component derived from a foreign material in the gas extract | collected in the middle of the process in the method of manufacturing a recycled pulp using waste paper. The means for performing the analysis step is not particularly limited as long as an existing method for analyzing a trace component (for example, 1 ppt to 1 ppm) in a gas can be used, and the target component can be analyzed.

  Examples of the analysis method include a method using an analysis device. From the viewpoint that the analysis device is relatively small and capable of highly sensitive measurement, an asymmetric field ion mobility spectrometer (FAIMS) should be used. Is preferred. Other preferable analyzers include a gas chromatograph-mass spectrometer (GC-MS) and an ion mobility spectrometer. It is preferable to separate components by gas chromatography before analysis by the analyzer. By separating the components by gas chromatography and then analyzing the components by the analyzer, the sensitivity of the analysis by the analyzer is improved.

  The stage of collecting the gas is not particularly limited. An example of a preferred stage is the waste paper stage at the beginning of the process. The waste paper may be in the form of a single waste paper or an aggregate of waste paper. Further, from the viewpoint that volatile components derived from foreign substances can be sufficiently contained, it is also preferable to collect gas in the heated process, and examples thereof include a disaggregation process or a papermaking process.

  When collecting gas at the stage of used paper (one piece of paper) or used paper aggregate, it is not particularly limited. For example, the gas derived from the used paper existing around the used paper is recovered by an appropriate means. Sampling can be performed at ambient temperature, and can be performed in a warmed environment as necessary.

  In a preferred embodiment, the gas is collected from the used paper by using a means for supplying a carrier gas (for example, air. Hereinafter, air will be described as an example), and air is used in the used paper, between the used paper, or around the used paper. By collecting and analyzing the gas that has been sent and exhausted. The passage of air between the used paper is advantageous and important for obtaining a sublimable or volatile component that can be analyzed as a gas. As a specific method, for example, when performing on a lab scale, gas is collected by putting waste paper into a bottle with a lid, supplying air to the bottle, and supplying the exhausted gas to the analyzer. And can be analyzed. Moreover, when performing on a commercial scale, you may send air to waste paper and supply exhaust_gas | exhaustion to an analyzer on the belt conveyor which transfers waste paper to a disaggregation process. In addition, a drum-type conveyor may be used as means for transferring the used paper to the disaggregation processing step, air may be sent from one end of the drum to the used paper, and exhaust from the other end may be supplied to the analyzer. The term “gas collected from waste paper” in the present invention includes collecting exhaust gas obtained by supplying air in this way.

  There may be one or a plurality of gas collection points from waste paper. The analysis can be performed in real time, depending on the analyzer used (described later) and the presence or absence of a concentration step.

  When gas is collected at the stage of the disaggregation process, it is not particularly limited. For example, by collecting the gas derived from the pulper existing above the disaggregation layer during or after the disaggregation process by an appropriate means. . According to the study by the present inventors, the component to be analyzed by the present invention can be recovered and analyzed as a gas even when water is added.

  Even in the method or system for producing paper or paperboard (including white paperboard), the stage of collecting gas is not particularly limited. For example, in a method or system for producing white paperboard, gas may be collected in, for example, a papermaking process or a process of forming a coating layer.

  The stage of collecting gas in the paper making process (including wire part, press part, dryer part, coater part, calendar part, reel part) or in the coating layer forming process is not particularly limited. And / or can be a dryer part that is blown. Similarly, when collecting gas in the process of forming the coating layer, it may be a stage for drying. Heating and blowing for drying can be advantageous and important for gas collection.

  The collected gas may be subjected to pretreatment such as separation or concentration of a specific peak as necessary. Although it does not specifically limit as pre-processing, Specifically, you may isolate | separate a specific peak using the column packed with dimethylpolysiloxane etc. Moreover, in the aspect which extract | collects gas from a disaggregation process process product, the liquid extract | collected from the inside of a pulper may be concentrated, and gas may be extract | collected from the concentrated liquid. The gas concentration means and the liquid concentration means that can be used for the pretreatment are not particularly limited, and conventional techniques can be applied.

<Manufacturing method>
The method for producing recycled pulp from waste paper of the present invention includes at least a disaggregation process step for waste paper. If desired, a foreign matter removing step, a dust removing step, a dispersing step, a bleaching step, a deinking step, and a dehydration / washing step may be included. The method for producing paper or paperboard from used paper of the present invention includes at least a disaggregation process step and a papermaking step of the used paper. When the production method of the present invention is a production method of white paperboard, it includes at least a disaggregation process step of used paper, a papermaking step, and a coating layer forming step.

[Disaggregation process]
In the disaggregation processing step, disaggregation processing is performed to disaggregate waste paper to form a slurry. For the disaggregation process, a disaggregator generally called a pulper is used. As the pulper, for example, a low-concentration pulper treated at a dry solid content concentration of 3 to 5% by mass, a medium-concentration pulper treated at a dry solid content concentration of 5 to 18% by mass, and a dry solids concentration of 18 to 25% by mass. Examples include high-concentration pulpers.

  Examples of the low-concentration pulper include those in which a stirring blade called a rotor is attached to the bottom surface or inner wall surface of a tank. The medium concentration pulper is the same as the above low concentration pulper, and includes a rotor with a larger rotor shape and a disaggregation tank with a horizontal drum shape. An example of the high-concentration pulper is a kneading pulper in which stirring blades are installed in multiple stages in the tank. In addition, when used paper is difficult to disaggregate, a defibrating machine can be used in addition to the disaggregating machine.

The disaggregation treatment step in the present invention is not particularly limited, but as a preferable treatment, the raw waste paper is diluted so that the dry solid content concentration is 1 to 18% by mass, more preferably 12 to 18% by mass, or 2 to 5% by mass. Add water. Further, sodium hydroxide may be added in an amount of 0.6 to 3.5% by mass, preferably 1.0 to 2.5% by mass, based on the dry solid content of the raw material waste paper.
The disaggregation treatment time can be 10 to 30 minutes, preferably 10 to 25 minutes, more preferably 10 to 18 minutes, and the disaggregation treatment temperature can be 10 to 50 ° C, preferably 30 to 50 ° C. .

[Foreign substance removal process]
In the foreign matter removal step, foreign matter removal using a cleaner is performed mainly for the purpose of removing large foreign matter generated after the disaggregation processing step. The cleaner has a conical shape, and can remove foreign substances having a specific gravity larger than that of pulp fibers such as sand and metal particles by the principle of centrifugal separation. Since the dry solid content concentration of the slurry when treating with a cleaner is preferably 1 to 7% by mass, more preferably 2 to 5% by mass, if necessary, it is diluted with water after the disaggregation treatment step. Then, the foreign matter removing step can be performed.

[Dust removal process]
In the dust removal process, similarly to the foreign substance removal process, a process using a screen is performed for the purpose of removing foreign substances generated after the disaggregation process. As the screen, for example, a basket type in which holes or slits having a predetermined opening area are formed, slit screens can be used, and coarse screens can be used. Well, you can use a selection screen. Examples of the coarse screen include a round hole screen (1.5 to 2.5 mmΦ) and a slit screen (0.2 to 0.25 mm slit). As an example of a carefully selected screen, the slit width can be 0.10 to 0.25 mm, preferably 0.10 to 0.20 mm, and more preferably 0.1 to 0.15 mm. More preferably, the thickness is 0.1 to 0.13 mm. If the slit width of the selection screen is too wide, it is difficult to sufficiently reduce foreign matter. On the other hand, if the slit width is too narrow, the yield of waste paper pulp decreases.

  Although the dust removal step may be performed a plurality of times, if the number of the fine dust removal step is too large, the yield of waste paper pulp is lowered, and therefore it is preferably 1 to 3 times. Since the dry solid content concentration of the slurry when processing with a screen in the dust removal step is preferably 0.5 to 5% by mass, if necessary, after diluting with water after the foreign matter removal step, the coarse dust removal step I do. When the dry solid content concentration of the slurry is 0.5% by mass or more, foreign matters can be efficiently removed. When the dry solid content concentration of the slurry after the dilution step is 5% by mass or less, clogging of the screen can be prevented.

[Deinking process]
In the case where used printed paper is used, it is preferable to perform a deinking step of performing a deinking process with a floatator or the like before the dehydration concentration step. By the deinking process, coarse inorganic foreign matters can be removed from the slurry together with the remaining ink.

  The dry solid content concentration of the slurry when treating with a floatator is preferably 0.5 to 2% by mass, and more preferably 0.5 to 1% by mass. After the process, it is diluted with water and then treated with a floatator. In the deinking step, a deinking agent may be further added immediately before processing with the floatator. As the deinking agent used immediately before the treatment with the floatator, those having strong ink aggregating properties are preferable. In the case of fatty acids, DI-254 (oleic acid), DI-268, Daiichi manufactured by Kao Corporation. K-4004-D manufactured by Kogyo Seiyaku Co., Ltd. In the case of the fatty acid derivative system, there are DIY-23543 manufactured by Kao Corporation, Paper Aid W manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., Daihope 1000, and the like, but not limited thereto.

  When a deinking agent is added, the deinking agent can be added in an amount of 0.01 to 0.5% by mass, preferably 0.03 to 0.3% by mass, based on the dry solid content of the raw waste paper.

[Dispersing process]
In the dispersion step, a dispersion treatment for dispersing the inorganic filler and the like in the slurry is performed. By the dispersion treatment, not only the inorganic filler but also the remaining ink can be reduced. For example, when using magazine waste paper that contains a large amount of coated paper (especially coated paper with a thick coat layer) that contains an inorganic filler, the inorganic filler that did not disperse sufficiently during the disaggregation process was compared. May remain as a large lump. When this lump is contained in waste paper pulp, the multilayer paper base material obtained by using this lump may accelerate the wear of the mold. Therefore, when used paper containing a large amount of coated paper is used, it is preferable to perform a dispersion process.

  Machines that can be used in distributed processing include, for example, disintegrators such as finalers, conifers, top finalers, conical discs, deflakers, conical flakers, and power finers, refiners such as refiners, double disc refiners, and beaters, kneaders and dispersers. And kneading / dispersing machines such as new dispersers and hot dispersers (hot dispersion equipment). Of these, a disperser or a hot disperser is preferred. When the treatment is performed using a disperser or a hot disperser, the inorganic filler can be made fine with high efficiency without extremely reducing the freeness even in the case of a high concentration slurry having a dry solid content concentration of 25% by mass or more. When processing with a disperser or a hot disperser, it is preferable to heat to 80 to 120 ° C. with a steam / heater because the efficiency of the dispersion process is improved.

[Washing and dehydration process]
The washing step is a step of repeatedly performing a pulp washing treatment alternately with a dehydration treatment as occasion demands as a final step of waste paper pulp production. If the pulp washing treatment is performed, the amount of ash in the waste paper can be easily reduced. Specifically, when a pulp washing treatment is performed after the dispersion treatment, the amount of ash content of the used paper pulp can be easily adjusted to 1 to 15% by mass even if a large amount of used paper having an ash content exceeding 2% by mass is used. Therefore, in the multilayer paper base material 1 in which the middle back layer 20 is formed using waste paper pulp, the ash content of the middle back layer 20 can be easily adjusted to 0.5 to 10% by mass.

Examples of machines that can be used for the pulp cleaning treatment include cleaning devices such as DNT washers, compact washers, fall washers, bario splits, SP filters, DP Cosmo, and gap washers.
Since the ash removal efficiency in the pulp washing process is improved as the dry solid content concentration is lower, it is preferable to dilute the slurry before the pulp washing process. The dry solid content concentration of the slurry before the pulp washing treatment is preferably 0.5 to 5% by mass, more preferably 1 to 4% by mass, and further preferably 1 to 3% by mass. .

[Paper making process]
The pulp slurry thus obtained can be subjected to a papermaking process to produce paper products such as sheet-like paper and paperboard. The production of the paper product is not particularly limited, but can typically be based on the following papermaking method, coating method, or the like.

<Papermaking method>
The papermaking method typically involves cutting the water by filtration while intertwining the fibers on the wire, forming a paper layer, pressing the paper on a filter cloth, pressing between the rolls, and depressing the press part. And a dryer part that dries the paper using multiple dryer syringes and the like.

  The concentration of the slurry used for the papermaking process is not particularly limited, but it is preferably 0.05 to 5% by mass. If the concentration is too low, it takes a long time for filtration. Conversely, if the concentration is too high, a uniform sheet is obtained. This is not preferable because

  The dehydration method that can be used in the present invention is not particularly limited, and examples include a dehydration method that is usually used in paper production, and a method of dehydrating with a roll press is preferable. Although it does not specifically limit as a filter cloth in the case of spin-dry | dehydrating a slurry, It is important that a pulp fiber does not pass and a filtration rate does not become too slow. Although it does not specifically limit as such a filter cloth, The sheet | seat, fabric, and porous film which consist of organic polymers are preferable. The organic polymer is not particularly limited, but non-cellulosic organic polymers such as polyethylene terephthalate, polyethylene, polypropylene, polytetrafluoroethylene (PTFE) and the like are preferable. Specific examples include a porous film of polytetrafluoroethylene having a pore diameter of 0.1 to 20 μm, for example, 1 μm, and polyethylene terephthalate or polyethylene fabric having a pore diameter of 0.1 to 20 μm, for example, 1 μm, but are not particularly limited.

  Further, the drying method is not particularly limited, and examples thereof include methods used in paper production. For example, methods such as a cylinder dryer, a Yankee dryer, hot air drying, and an infrared heater are preferable.

<Coating method>
The coating method is a method of obtaining a sheet by coating a pulp slurry on a substrate and drying the pulp slurry to separate the pulp fiber-containing layer formed from the substrate. By using a coating apparatus and a long base material, sheets can be continuously produced. The quality of the base material is not particularly limited, but the one with higher wettability to the slurry may be able to suppress the shrinkage of the sheet at the time of drying, but the sheet formed after drying can be easily peeled off. It is preferable to select. Among them, a resin plate or a metal plate is preferable, but is not particularly limited. Among them, suitable ones are preferably used alone or laminated. For example, resin plates such as acrylic plates, polyethylene terephthalate plates, vinyl chloride plates, polystyrene plates, polyvinylidene chloride plates, metal plates such as aluminum plates, zinc plates, copper plates, iron plates, etc., and those whose surfaces are oxidized, stainless steel Although a board, a brass board, etc. can be used, it is not specifically limited. In order to apply the slurry onto the substrate, various coaters that can apply a predetermined amount of slurry to the substrate may be used. Although not particularly limited, for example, a roll coater, a gravure coater, a die coater, a curtain coater, a spray coater, a blade coater, a rod coater, an air doctor coater, etc. can be used, among which a die coater, curtain coater, spray coater, air doctor coater can be used. A coating method such as the above is effective for uniform coating.

  Although it does not specifically limit as a drying method, Either a non-contact drying method or the method of drying while restraining a sheet | seat may be sufficient, and these may be combined.

  The non-contact drying method is not particularly limited, but a method of drying by heating with hot air, infrared rays, far infrared rays or near infrared rays (heating drying method) or a method of drying in vacuum (vacuum drying method) is applied. Can do. Although the heat drying method and the vacuum drying method may be combined, the heat drying method is usually applied. Although drying by infrared rays, far infrared rays, or near infrared rays can be performed using an infrared device, a far infrared device, or a near infrared device, it is not particularly limited. Although the heating temperature in a heat drying method is not specifically limited, It is preferable to set it as 40-120 degreeC, and it is more preferable to set it as 40-105 degreeC. If the heating temperature is at least the lower limit, the dispersion medium can be volatilized quickly, and if the heating temperature is not more than the upper limit, the cost required for heating and the discoloration due to the heat of the pulp fibers can be suppressed.

  The thickness of the manufactured sheet is not particularly limited.

[Coating layer formation process]

  White paperboard is generally produced by providing a pigment coating layer mainly composed of a pigment and a binder on the surface of a paper base. The pigment coating layer can be formed on the surface of the base paper by coating and drying the surface of the base paper on which a pigment coating liquid mainly composed of a pigment and a binder is running. As a method for forming the pigment coating layer, various types of coating methods are appropriately selected and used according to the properties of the coating liquid to be coated and various qualities required for the coated paper, This embodiment is not particularly limited. In this embodiment, a coating apparatus used for forming a conventional coating layer can be used. For example, a blade coater, an air knife coater, a plain rod coater, a roll coater, a reverse roll coater, a bar coater, and a die slot coater. Coating apparatuses such as a gravure coater, a champlex coater, a 2 roll size press coater, and a gate roll size press coater can be used.

<Recycled pulp, paper, paperboard (white paperboard)>
The present invention can be applied to the production of recycled pulp. Paper products such as paper and paperboard can be produced from the recycled pulp produced according to the present invention, and the types of paper products are not particularly limited. Specific examples of paper products include newspaper rolls (eg, newsprint), wrapping paper (eg, craft packaging, paper envelopes, paper bags), printing / information paper (copy paper, drawing paper, notebooks, magazine paper, colored paper), hygiene Specific examples of paperboard (for example, tissue, toilet paper) paperboard products include white paperboard, cardboard, paper tube, building materials, and paper containers. According to the present invention, foreign matters are removed and a product having a particularly good appearance can be obtained. Therefore, the present invention can be applied particularly suitably for producing white paperboard. Among white paperboards, it is particularly suitable for printing boxes (for individual packaging such as pharmaceuticals, cosmetics, soap, tobacco, caramel, frozen foods, and liquid foods).

  In the present invention, even when not producing recycled pulp, paper, or paperboard from used paper, it is possible to collect gas from used paper itself and analyze components derived from foreign matters in the collected gas. When a foreign substance-derived component is detected, at least a part of the used paper can be removed.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to the following Example. In addition, the numerical value which shows a mixing | blending, a density | concentration, etc. is a numerical value based on the mass of dry solid content.

<Example 1: Analysis at raw material stage>
Assuming equivalent to one A4 sheet in 50kg of used paper, 2 bottles of sublimation transfer paper (5cm x 2.5cm) and used paper in a stainless steel bottle (large size: inner diameter 14.9cm, depth 24.0cm, 40 ° C) The generated gas when about 82 g was charged was supplied to FAIMS, and the peak was confirmed. (It is important to send the gas that has passed through the paper surface to the detector.)
The gas on the used paper was collected and analyzed with a FAIMS apparatus (asymmetric field ion mobility spectrometer: manufactured by Atnerp). The analysis results are shown in FIG.

  As shown in FIG. 1, red sublimation dye C.I. which is a component of sublimation transfer paper. I. A component derived from Disperse Red 60 (CasNo. 17418-58-5, 1-Amino-4-hydroxy-2-phenanthanthquinone) could be detected with a negative ion peak. Therefore, by collecting and analyzing the gas on the used waste paper, either the target waste paper is not used as a raw material according to the analysis result, or the sublimation transfer paper is removed from the target waste paper (used paper pile). Later, it can be used as a raw material.

<Example 2: Pretreatment of sampling gas>
Collect the gas on the waste paper (put 1cm x 3cm of red sublimation transfer paper and about 1.0g of waste paper into a stainless steel oven (heated at 50 ° C), feed air and collect the collected gas) with a short column (total length 50cm, inner diameter 0) .8 mm) and a filler (silicone and dimethylpolysiloxane), and then gas separation was performed with a FAIMS apparatus (asymmetric field ion mobility spectrometer: manufactured by Atnape). As analysis conditions, continuous mode (field intensity DF value fixed at 60%, peak at compensation voltage (positive 0.16 V) was measured continuously. The analysis results are shown in FIG.

  As shown in FIG. 2, red sublimation dye C.I. which is a component of sublimation transfer paper. I. A component derived from Disperse Red 60 (CasNo. 17418-58-5, 1-Amino-4-hydroxy-2-phenanthanthquinone) could be detected with a positive ion peak. For this reason, by collecting and analyzing the gas on the used waste paper, the target waste paper is not used as a raw material according to the analysis result, or is used as a raw material after the sublimation transfer paper is removed from the used waste paper. be able to.

<Example 3: Analysis of PPC paper>
Collect gas on waste paper made of PPC paper (same concentration as in Example 2), and collect the collected gas using a short column (total length 50 cm, inner diameter 0.8 mm, peaking using a filler (silicone and dimethylpolysiloxane)) Then, the gas was analyzed with a FAIMS apparatus (asymmetric field ion mobility spectrometer: manufactured by Atnerp Co., Ltd.) The analysis conditions were continuous mode (field strength DF value fixed at 60%, compensation voltage (positive 0.16 V)). The peak was measured continuously, and the analysis result is shown in FIG.

  As shown in FIG. 3, red sublimation dye C.I. which is a component of sublimation transfer paper. I. A component derived from Disperse Red 60 (CasNo. 17418-58-5, 1-Amino-4-hydroxy-2-phenanthanthquinone) was detected with a peak of positive ions. From this, by collecting and analyzing the gas on the target PPC waste paper, depending on the analysis result, the PPC waste paper pail is not used as a raw material, or after removing the sublimation transfer paper from the target PPC waste paper, It can be used as a raw material.

<Example 4: Analysis of mold odor component>
Waste paper sample (0.51 g of used paper, 5 μL of 2,4,6-Trichloroanisole (aka TCA, Tokyo Chemical Industry Co., Ltd.) 100 ppm solution and 2,4,6-Tribromoanisole (aka TBA, Tokyo Chemical Industry Co., Ltd.) 100 ppm solution A sample to which 50 μL was added was placed in a sealed container and kept at 45 ° C. for 20 minutes. The generated gas was analyzed by GC-MS (Gas Chromatograph Mass Spectrometer (Agilent HS-GC / MS: HS (7697A), GC (7890A), MS (5975C)) and the analysis results are shown in Fig. 4. The separation conditions were GC column: DB-1 (manufactured by Agilent), maintained at 40 ° C for 10 minutes, and then 260 ° C at 10 ° C / minute. The temperature was raised to ° C.

  As shown in FIG. 4, TCA and TBA, which are components of mold odor, were detected. The mass spectrum of the peak at 30.371 minutes (the upper part of FIG. 5) coincided with the TCA (the lower part of FIG. 5). Furthermore, the mass spectrum of the peak at 34.609 minutes (the upper part of FIG. 6) coincided with the TBA (the lower part of FIG. 6).

  From the above, it was found that the mold odor component contained in the used paper can be analyzed by gas, and depending on the detection result, all or part of the target used paper can be used as a raw material.

<Example 5: Analysis of components derived from foam sheet>
Waste paper sample containing foam sheet (sample containing 0.5 g × 0.2 cm of foamed paper in 0.5 g of waste paper shredded and shredded) placed in a closed container and kept at 45 ° C. for 20 minutes, the generated gas is GC- The product was introduced into MS (gas chromatograph mass spectrometer, manufactured by Agilent) and analyzed.

  The analysis result (total ion chromatogram) is shown in FIG. Separation conditions were GC column: DB-1 (manufactured by Agilent), kept at 40 ° C. for 10 minutes, and then heated to 260 ° C. at 10 ° C./min. As shown in FIG. 7, foamed sheet-derived components (isobutane, isopentane, pentane, and these components were not detected from waste paper) were detected. The mass spectrum of the peak at 5.316 minutes was consistent with isobutane (FIG. 8). Moreover, the mass spectrum of the peak at 7.492 minutes was consistent with that of isopentane (FIG. 9). The mass spectrum of the peak at 8.163 minutes was consistent with pentane (FIG. 10). As a reference, the analysis results under the same conditions for each of the foam sheet and the waste paper are shown in FIG. In addition, from the viewpoint of being detected with high sensitivity, isobutane and isopentane are particularly preferable for detecting the foamed sheet.

  From the above, it was found that the foam sheet-derived component contained in the used paper can be analyzed by gas, and depending on the detection result, all or part of the target used paper can be used as a raw material.

<Example 6: Analysis of mold odor component>
Waste paper samples (0.61 g of waste paper, 5 μL of 2,4,6-Trichloroanisole (aka TCA, Tokyo Chemical Industry Co., Ltd.) 1 ppm solution and 1 ppm solution of 2,4,6-Tribromoanisole (aka TBA, Tokyo Chemical Industry Co., Ltd.) A sample to which 50 μL was added was placed in a sealed container and kept at 45 ° C. for 20 minutes. The generated gas was analyzed by GC-MS (Gas Chromatograph Mass Spectrometer (Agilent HS-GC / MS: HS (7697A), GC (7890A), MS (5975C)) and analyzed, and the analysis results are shown in Fig. 4. In addition, detection is performed in SIM mode (from 29 minutes to 33 minutes, mass ions 210, 212, 195, 197 of TCA are detected, and after 33 minutes, TBA is detected. Mass ions 329, 331, 344, and 346. The separation conditions were GC column: DB-1 (manufactured by Agilent), 10 ° C / min after holding at 40 ° C for 10 minutes. It was heated to 60 ° C..

  As shown in FIGS. 12, 13 and 14, TCA and TBA, which are components of mold odor, were detected. FIG. 12 shows a total ion chromatogram. FIG. 13 shows mass spectra of the mass ions 210, 212, 195, and 197, and a TCA peak of 30.371 minutes was detected. FIG. 14 shows mass spectra of mass ions 329, 331, 344, and 346, and a peak at 34.609 minutes was confirmed.

  From the above, it was found that the mold odor component contained in the used paper can be analyzed by gas, and depending on the detection result, all or part of the target used paper can be used as a raw material.

<Example 7>
A model experiment was conducted assuming that waste paper (containing sublimation transfer paper) was wet. Water was sprayed on the printing surface (containing sublimation dye) of the sublimation transfer paper with a fog blower to humidify the sublimation transfer paper. After adding one sheet of humidified sublimation transfer paper (1cm x 1cm) to a stainless steel bottle (lab scale: inner diameter 3cm, depth 7.5cm, 40 ° C), the generated gas is collected in the stainless steel bottle (top), and FAIMS Components contained in the gas were analyzed with an apparatus (asymmetric field ion mobility spectrometer: manufactured by Atnape). The analysis results are shown in FIG.

  As shown in FIG. 15, red sublimation dye C.I. which is a component of sublimation transfer paper. I. A component derived from Disperse Red 60 (CasNo. 17418-58-5, 1-Amino-4-hydroxy-2-phenanthanthquinone) could be detected with a negative ion peak. From the above results, it was confirmed that the waste paper containing the sublimation transfer paper can be detected by collecting and analyzing the gas on the waste paper even when the waste paper (containing the sublimation transfer paper) is wet with water. . Depending on the analysis result, the target waste paper is not used as a raw material, or can be used as a raw material after the sublimation transfer paper is removed from the target waste paper (pile of waste paper).

<Example 8>
A model experiment was conducted assuming that waste paper (containing sublimation transfer paper) gets wet in the rain or that the pulp is disaggregated with water in the pulper. Both sides of the sublimation transfer paper (containing sublimation dye) were immersed in water. After adding one sheet of sublimation transfer paper (1cm x 1cm) wet with water to a stainless steel bottle (lab scale: inner diameter 3cm, depth 7.5cm, 40 ° C), the generated gas is collected in the stainless steel bottle (top). The components contained in the gas were analyzed with a FAIMS apparatus (asymmetric field ion mobility spectrometer: manufactured by Atnerup). The analysis results are shown in FIG.

  As shown in FIG. 16, red sublimation dye C.I. which is a component of sublimation transfer paper. I. A component derived from Disperse Red 60 (CasNo. 17418-58-5, 1-Amino-4-hydroxy-2-phenanthanthquinone) could be detected with a negative ion peak. From the above results, it was confirmed that the waste paper containing the sublimation transfer paper can be detected by collecting and analyzing the gas on the waste paper even when the waste paper (containing the sublimation transfer paper) is wet with water. . Depending on the analysis result, the target waste paper is not used as a raw material, or can be used as a raw material after the sublimation transfer paper is removed from the target waste paper (pile of waste paper).

Claims (12)

A method for producing recycled pulp using waste paper as a raw material, through a disaggregation process,
A production method comprising a step of analyzing a component derived from a foreign substance in a gas collected from waste paper, a disaggregation treatment step, or recycled pulp. A method of producing paper or paperboard using waste paper as a raw material, through a papermaking process,
A manufacturing method comprising a step of analyzing a component derived from a foreign substance in a gas collected from waste paper, a disaggregation treatment step, a recycled pulp or a papermaking step. The production method according to claim 1 or 2, wherein the foreign matter is any one selected from the group consisting of sublimation transfer paper, microorganisms, microorganism conversion products, foam sheets, and adhesive foreign matter. The production method according to claim 1 or 2, wherein the foreign substance-derived component is any one selected from the group consisting of a sublimable dye compound, a musty odor-causing substance, and a foam sheet-derived component. Components derived from foreign substances
1,4-diamino-2,3-diphenoxy-9,10-anthracene dione, 5-bromo ^{-Δ 2,2 '(3H, 3'} H) - bi [1H-indole] -3,3'-geo, 1-methylamino-4-phenylamino-9,10-anthraquinone, 1,4-bis (isopropylamino) -9,10-anthraquinone, 1,4-dimethylaminoanthraquinone, 4- (diethylamino) azobenzene, bromide or 1,5-dihydroxy-4,8-diaminoanthraquinone chloride, 1,4-diamino-2,3-dichloroanthraquinone, 1-amino-4-hydroxyanthraquinone, 1-amino-4-hydroxy-2- (β-methoxy) Ethoxy) -anthraquinone, 1-amino-4-hydroxy-2-phenoxyanthraquinone, 1,4-diaminoanthraquinone-2-ca Methyl, ethyl, propyl, butyl ester of boronic acid, 1,4-diamino-2-methoxyanthraquinone, 1-amino-4-anilinoanthraquinone, 1-amino-2-cyano-4-anilino (or cyclohexylamino)- Any selected from the group consisting of anthraquinone, 1-hydroxy-2- (p-acetaminophenylazo) -4-methylbenzene, 3-methyl-4- (nitrophenylazo) -virazolone and 3-hydroxyquinophthalone Sublimable dye compounds;
Any mold odor-causing substance selected from the group consisting of 2,4,6-trichloroanisole and 2,4,6-tribromoanisole; and any foam selected from the group consisting of isobutane, isopentane and pentane The manufacturing method of Claim 4 which is either selected from the group which consists of a sheet origin component. The production method according to claim 1, wherein the analysis is performed by at least one method selected from the group consisting of asymmetric field ion mobility spectrometry, mass spectrometry, and ion mobility. . The production method according to any one of claims 1 to 6, wherein separation by gas chromatography is performed before analysis. The manufacturing method of any one of Claims 1-7 by which the extract | collected gas is pre-processed. The manufacturing method of any one of Claims 1-8 including the process of removing at least one part of waste paper, a disaggregation processing process product, a regenerated pulp, or a papermaking process product, when the component derived from a foreign material is detected. . A system for producing recycled pulp from waste paper as a raw material through a disaggregation treatment step, including means for analyzing components derived from foreign matters in the gas collected from the waste paper, the disaggregation treatment step or the recycled pulp, system. A system for producing paper or paperboard from used paper as a raw material, through a papermaking process, and a means for analyzing components derived from foreign substances in gas collected from the used paper, disaggregation process, recycled pulp or papermaking process Including the system. 12. The system according to claim 10 or 11, comprising means for removing at least a part of waste paper, a disaggregation treatment process product, a recycled pulp or a papermaking process product when a component derived from a foreign substance is detected.