Circulation-type waste water treatment system

Abstract

Provided is a waste water treatment system suitable for the treatment of water-based flexographic printing ink waste water, waste water generated in a cardboard sheet production process, or the like.

Description

[0001 ] This invention relates to waste water treatment systems, and more particularly, to a waste water treatment system suitable for treatment of, for example, aqueous-flexographic-ink waste water and waste water that is generated in a corrugated-cardboard-sheet manufacturing process. Background Art

[0002] Aqueous flexographic printing is mainly used for printing on packaging materials, specifically, printing on paper-based packaging materials, more specifically, paper containers such as corrugated cardboard and cartons, and paper bags such as shopping bags.

[0003] Aqueous flexographic inks to be used for the aqueous flexographic printing are waterbased, and hence various apparatuses, devices, and so forth used in processes of manufacturing the aqueous flexographic inks can be cleaned with water. In addition, also when printing is performed by using the aqueous flexographic inks, various printers and auxiliary devices can be cleaned with water. Thus, the aqueous flexographic inks are widely used for the printing on the paper-based packaging materials.

[0004] However, the aqueous flexographic inks contain petroleum-derived resins, pigments, and so forth, and hence cleaning waste water to be generated in processes of the cleaning is not allowed to be discharged directly into the natural environment. Thus, it is necessary to perform waste water treatment to separate and remove the resins, the pigments, and so forth mixed in the cleaning waste water.

[0005] Various proposals have hitherto been made with regard to the waste water treatment.

[0006] For example, Patent Literature 1 proposes a method of treating organic waste water, the method including a coagulation process of aggregating suspended solid matter in flexographic-ink cleaning waste water into flocs (coagulates) having a size of 3 mm or greater by using two or more ionic polymer flocculants having different ionic properties, and a solid-liquid separation process of filtering (dewatering) and recovering the aggregated flocs as a cake.

[0007] In addition, Patent Literature 2 proposes a method of treating waste water of an aqueous flexographic ink, the method including precipitating resin components constituting the aqueous flexographic ink by adding an aqueous solution of a treatment agent having a pH of 4 to 5 to a waste liquid containing the resin components, and separating aggregates by using a polymer flocculant. Citation List Patent Literature

[0008] [PTL 1] Japanese Patent Application Laid-open No. 2005-7246 [PTL2] Japanese Patent Application Laid-open No. 2007-14934 [PTL 3] Japanese Patent No. 7061473 Summary of Invention Technical Problem

[0009] Proposed is a circulation-type waste water treatment system that is suitable for treatment of, for example, aqueous-flexographic-ink waste water and waste water which is generated in a corrugated-cardboard-sheet manufacturing process, that reduces an amount of sludge to be generated by the waste water treatment, and that enables treated water to be reused for various purposes. Solution to Problem

[0010] To solve the problems as described above, a circulation-type waste water treatment system according to the invention of the present application includes: a primary water-treatment tank in which primary treatment is performed on water to be treated; a secondary water-treatment tank to which primary treated water after the water to be treated has been subjected to the primary treatment in the primary water-treatment tank is supplied, and in which secondary treatment is performed on the primary treated water; a sedimentation tank to which secondary treated water after the primary treated water has been subjected to the secondary treatment in the secondary water-treatment tank is supplied; and a treated-water tank to which sediment-treated water after sedimentation has occurred by settling the secondary treated water in the sedimentation tank is supplied as treated water.

[0011] Here, both the primary treatment and the secondary treatment are treatment including mixing micro-nano bubbles being ultrafine bubbles having a diameter of 40 pm or less and containing ozone into the water to be treated withdrawn from the primary water-treatment tank and the secondary water-treatment tank, and jetting the water to be treated in this state into the water to be treated in the primary water-treatment tank and the secondary water-treatment tank.

[0012] In addition, sediment that has been generated by the sedimentation in the sedimentation tank is returned to the primary water-treatment tank, and part of the treated water stored in the treated-water tank is returned to the primary water-treatment tank, and is supplied into the water to be treated that has been subjected to the primary treatment in the primary water-treatment tank.

[0013] To solve the problems as described above, the invention of the present application can be exemplified as follows. [ 1 ] A circulation-type waste water treatment system, including: a primary water-treatment tank in which primary treatment is performed on water to be treated; a secondary water-treatment tank to which primary treated water after the water to be treated has been subjected to the primary treatment in the primary water-treatment tank is supplied, and in which secondary treatment is performed on the primary treated water; a sedimentation tank to which secondary treated water after the primary treated water has been subjected to the secondary treatment in the secondary water-treatment tank is supplied; and a treated-water tank to which sediment-treated water after sedimentation has occurred by settling the secondary treated water in the sedimentation tank is supplied as treated water, the primary treatment being treatment including withdrawing the water to be treated stored in the primary water-treatment tank, causing the water to be treated to flow through a first micro-nano-bubble generation apparatus that generates micro-nano bubbles being ultrafine bubbles having a diameter of 40 pm or less while mixing ozone as a gas for generating the micro-nano bubbles into the water to be treated that flows through the first micro-nano-bubble generation apparatus, and jetting the water to be treated as ozone-containing micro-nano-bubble-mixed water to be treated in which the ozone-containing micro-nano bubbles generated by the mixing have been mixed, and which flows through the first micro-nano-bubble generation apparatus at a flow velocity of 15 m / sec to 25 m / sec, the jetting being performed from the first micro-nano-bubble generation apparatus into the water to be treated in the primary water-treatment tank, the secondary treatment being treatment including withdrawing the primary treated water stored in the secondary water-treatment tank, causing the primary treated water to flow through a second micro-nano-bubble generation apparatus that generates the micro-nano bubbles being the ultrafine bubbles having the diameter of 40 pm or less while mixing the ozone as the gas for generating the micro-nano bubbles into the primary treated water that flows through the second micro-nano-bubble generation apparatus, and jetting the primary treated water as ozone-containing micro-nano-bubble-mixed primary treated water in which the ozone-containing micro-nano bubbles generated by the mixing have been mixed, and which flows through the second micro-nano-bubble generation apparatus at the flow velocity of 15 m / sec to 25 m / sec, the jetting being performed from the second micro-nano-bubble generation apparatus into the primary treated water in the secondary water-treatment tank, sediment in the sedimentation tank, the sediment having been generated by the sedimentation in the sedimentation tank, being returned to the primary water-treatment tank.

[0014] [2] The circulation-type waste water treatment system according to [1], in which part of the treated water stored in the treated-water tank is returned to the primary water- 5 treatment tank, and is supplied into the water to be treated that has been subjected to the primary treatment in the primary water-treatment tank.

[0015] [3] The circulation-type waste water treatment system according to [1] or [2], in which the water to be treated is aqueous-flexographic-ink waste water that is generated when an apparatus and a device to be used for aqueous flexographic printing using aqueous flexographic ink are cleaned with water, or waste water that is generated in a corrugated-cardboard-sheet manufacturing process. Advantageous Effects of Invention

[0016] According to this invention, it is possible to provide a circulation-type waste water treatment system that is suitable for treatment of, for example, aqueous-flexographic-ink waste water and waste water which is generated in a corrugated-cardboard-sheet manufacturing process, that reduces an amount of sludge to be generated by the waste water treatment, and that enables treated water to be reused for various purposes. Brief Description of Drawings

[0017] [FIG. 1] An explanatory diagram showing an overview of a configuration of a circulationtype waste water treatment system according to an embodiment of this invention. [FIG. 2] An explanatory diagram showing an example a configuration of piping between a side where a raw-water tank that stores water to be treated which is treated in the circulationtype waste water treatment system according to the embodiment of this invention, and ozone generation apparatuses that generate ozone to be supplied to first and second micro-nano-bubble generation apparatuses are present, and a side where a water treatment mechanism including a primary water-treatment tank is present. [FIG. 3] An explanatory diagram showing an example of a configuration of an arrangement of the primary water-treatment tank and a secondary water-treatment tank in the circulation-type waste water treatment system according to the embodiment of this invention. [FIG. 4] An explanatory diagram showing an example of a configuration of an arrangement of a sedimentation tank and a treated-water tank in the circulation-type waste water treatment system according to the embodiment of this invention. Description of Embodiments

[0018] An embodiment of the present invention is described with reference to the accompanying drawings.

[0019] As shown in FIG. 1, a circulation-type waste water treatment system according to this embodiment includes a primary water-treatment tank 3, a secondary water-treatment tank 4, a sedimentation tank 5, and a treated-water tank 6.

[0020] The primary water-treatment tank 3 is a tank in which primary treatment is performed on water that is treated by the circulation-type waste water treatment system according to this embodiment. Below, herein, the water that is treated by the circulation-type waste water treatment system according to this embodiment is referred to as "water to be treated."

[0021] As examples of the water to be treated by the circulation-type waste water treatment system according to this embodiment, there may be mentioned aqueous-flexographic-ink waste water that is generated when apparatuses and devices to be used for aqueous flexographic printing using aqueous flexographic ink are cleaned with water, and waste water that is generated in a corrugated-cardboard-sheet manufacturing process.

[0022] In the embodiment shown in FIG. 1 and FIG. 2, the water to be treated stored in a rawwater tank 1 is transferred as indicated by an arrow 70 by fluid transfer means 30 such as a pump to the primary water-treatment tank 3 through a fluid transfer pipe 31.

[0023] In order that water treatment is performed on a scale of, for example, approximately 1,000 liters per day, the water to be treated is transferred from the raw-water tank 1 to the primary watertreatment tank 3 through the fluid transfer means 30 and the fluid transfer pipe 31.

[0024] The above-mentioned primary treatment to be performed on the water to be treated in the primary water-treatment tank 3 is treatment including withdrawing the water to be treated stored in the primary water-treatment tank 3, causing the water to be treated to flow, in a direction indicated by an arrow 71a, through a first micro-nano-bubble generation apparatus 7a that generates micro-nano bubbles being ultrafine bubbles having a diameter of 40 pm or less while mixing ozone as a gas for generating the micro-nano bubbles into the water to be treated that flows through the first micro-nano-bubble generation apparatus 7a, and jetting the water to be treated as ozone-containing micro-nano-bubble-mixed water to be treated in which the ozone-containing micro-nano bubbles generated by the mixing have been mixed, and which flows through the first micro-nano-bubble generation apparatus 7a at a flow velocity of 15 m / sec to 25 m / sec, the jetting being performed from the first micro-nano-bubble generation apparatus 7a into the water to be treated in the primary water-treatment tank 3.

[0025] In the shown embodiment, by fluid transfer means 8a such as a pump provided to the primary water-treatment tank 3, the water to be treated stored in the primary water-treatment tank 3 is withdrawn and pumped as indicated by an arrow 72a into the first micro-nano-bubble generation apparatus 7a through a fluid transfer pipe 12a connected to the primary water-treatment tank 3.

[0026] At this time, the ozone generated by an ozone generation apparatus 2a is supplied as indicated by an arrow 73a to the first micro-nano-bubble generation apparatus 7a through a fluid transfer pipe 32a.

[0027] With this, the ozone generated by the ozone generation apparatus 2a is mixed into the water to be treated flowing through the first micro-nano-bubble generation apparatus 7a at the flow velocity of 15 m / sec to 25 m / sec by being pumped into the first micro-nano-bubble generation apparatus 7a by the fluid transfer means 8a as described above. Then, the ozone-containing micro-nano-bubble-mixed water to be treated in which the micro-nano bubbles being the ultrafine bubbles having the diameter of 40 pm or less and containing the ozone have been mixed is jetted as indicated by the arrow 73a from the first micro-nano-bubble generation apparatus 7a into the water to be treated in the primary water-treatment tank 3.

[0028] In this way, the water to be treated in the primary water-treatment tank 3 is efficiently treated by using the micro-nano-bubble-mixed water to be treated in which the micro-nano bubbles being the ultrafme bubbles having the diameter of 40 gm or less and containing the ozone have been mixed, which has flowed through the first micro-nano-bubble generation apparatus 7a at the flow velocity of 15 m / sec to 25 m / sec, and which is jetted as indicated by the arrow 73a into the water to be treated in the primary water-treatment tank 3.

[0029] Primary treated water that has been subjected to the above-described primary treatment in the primary water-treatment tank 3 is supplied to the secondary water-treatment tank 4, and secondary treatment is performed on this primary treated water in the secondary water-treatment tank 4.

[0030] The secondary treatment to be performed on the primary treated water in the secondary water-treatment tank 4 is fundamentally the same as the above-described primary treatment to be performed on the water to be treated in the primary water-treatment tank 3. As described below, a configuration and a structure of the secondary water-treatment tank 4 are the same as the configuration and the structure of the above-described primary water-treatment tank 3.

[0031] In the shown embodiment, the primary treated water is supplied as indicated by an arrow 74 from the primary water-treatment tank 3 to the secondary water-treatment tank 4 through a fluid transfer pipe 13 that connects the primary water-treatment tank 3 and the secondary watertreatment tank 4 to each other.

[0032] The above-mentioned secondary treatment to be performed on the primary treated water in the secondary water-treatment tank 4 is treatment including withdrawing the primary treated water stored in the secondary water-treatment tank 4, causing the primary treated water to flow, in a direction indicated by an arrow 71b, through a second micro-nano-bubble generation apparatus 7b that generates the micro-nano bubbles being the ultrafme bubbles having the diameter of 40 pm or less while mixing the ozone as the gas for generating the micro-nano bubbles into the primary treated water that flows through the second micro-nano-bubble generation apparatus 7b, and jetting the primary treated water as ozone-containing micro-nano-bubble-mixed primary treated water in which the ozone-containing micro-nano bubbles generated by the mixing have been mixed, and which flows through the second micro-nano-bubble generation apparatus 7b at the flow velocity of 15 m / sec to 25 m / sec, the jetting being performed from the second micro-nano-bubble generation apparatus 7b into the primary treated water in the secondary water-treatment tank 4.

[0033] In the shown embodiment, by fluid transfer means 8b such as a pump provided to the secondary water-treatment tank 4, the primary treated water stored in the secondary watertreatment tank 4 is withdrawn and pumped as indicated by an arrow 72b into the micro-nano-bubble generation apparatus 7b through a fluid transfer pipe 12b connected to the secondary watertreatment tank 4.

[0034] At this time, the ozone generated by an ozone generation apparatus 2b is supplied as indicated by an arrow 73b to the second micro-nano-bubble generation apparatus 7b through a fluid transfer pipe 32b.

[0035] With this, the ozone generated by the ozone generation apparatus 2b is mixed into the primary treated water flowing through the micro-nano-bubble generation apparatus 7b at the flow velocity of 15 m / sec to 25 m / sec by being pumped into the second micro-nano-bubble generation apparatus 7b by the fluid transfer means 8b as described above. Then, the ozone-containing micro-nano-bubble-mixed primary treated water in which the micro-nano bubbles being the ultrafine bubbles having the diameter of 40 pm or less and containing the ozone have been mixed is jetted as indicated by the arrow 73b from the second micro-nano-bubble generation apparatus 7b into the primary treated water in the secondary water-treatment tank 4.

[0036] In this way, the primary treated water in the secondary water-treatment tank 4 is efficiently treated by using the micro-nano-bubble-mixed primary treated water in which the micro-nano bubbles being the ultrafine bubbles having the diameter of 40 pm or less and containing the ozone have been mixed, which has flowed through the second micro-nano-bubble generation apparatus 7b at the flow velocity of 15 m / sec to 25 m / sec, and which is jetted as indicated by the arrow 73b into the primary treated water in the secondary water-treatment tank 4.

[0037] As the first micro-nano-bubble generation apparatus 7a and the second micro-nano bubble generation apparatus 7b described above in each of which the ozone is mixed as the gas for generating the micro-nano bubbles into the fluid that flows through a corresponding one of the first micro-nano-bubble generation apparatus 7a and the second micro-nano-bubble generation apparatus 7b at the flow velocity of 15 m / sec to 25 m / sec, and from which the fluid in which the ozone-containing micro-nano bubbles being the ultrafine bubbles generated by the mixing and having the diameter of 40 pm or less have been mixed is jetted together with the micro-nano bubbles into fluid treatment tanks, known micro-nano-bubble generation apparatuses in the related art, which have such a function, may be used.

[0038] For example, the apparatus described in Patent Literature 3 can be exemplified as such a micro-nano-bubble generation apparatus.

[0039] The sedimentation tank 5 is a tank to which the secondary treated water after the abovedescribed primary treated water has been subjected to the above-described secondary treatment in the secondary water-treatment tank 4 is supplied.

[0040] In the shown embodiment, the secondary treated water is supplied as indicated by an arrow 75 from the secondary water-treatment tank 4 to the sedimentation tank 5 through a fluid transfer pipe 14 that connects the secondary water-treatment tank 4 and the sedimentation tank 5 to each other. With this, the secondary treated water is stored and settled in the sedimentation tank 5. [0041 ] The treated-water tank 6 is a tank to which sediment-treated water after sedimentation has occurred by settling the secondary treated water in the sedimentation tank 5 is supplied as treated water.

[0042] In the shown embodiment, the sediment-treated water is supplied as indicated by an arrow 76 from the sedimentation tank 5 to the treated-water tank 6 through a fluid transfer pipe 15 that connects the sedimentation tank 5 and the treated-water tank 6 to each other. With this, the supplied sediment-treated water is stored and settled as treated water 21 in the treated-water tank 6.

[0043] The treated water 21 in the treated-water tank 6 has been treated by using the micro-nano bubbles being the ultrafine bubbles having the diameter of 40 gm or less and containing the ozone in the primary treatment and the secondary treatment described above. Thus, the treated water 21 has become water that is disinfected, sterilized, deodorized, and decolorized. In addition, no chemical agents are used in the primary treatment and the secondary treatment described above, and hence the treated water 21 can be obtained without using chemical agents while being disinfected, sterilized, deodorized, and decolorized.

[0044] The treated water 21 in the treated-water tank 6, which can be discharged, has been treated by using the micro-nano bubbles being the ultrafine bubbles having the diameter of 40 pm or less and containing the ozone in the primary treatment and the secondary treatment described above. The treated water 21 has become activated water, and hence is reusable as the activated water for various purposes instead of being discharged. One of functions of the activated water is a cleaning effect, and the treated water 21 is reusable for such purposes.

[0045] Since the treated water 21 in the treated-water tank 6 is reusable for various purposes in such a way, an amount of water to be used, for example, in the circulation-type waste water treatment system according to this embodiment, or in facilities equipped with the circulation-type waste water treatment system according to this embodiment can be reduced. Thus, water utility costs can be reduced.

[0046] In the circulation-type waste water treatment system according to this embodiment, sediment in the sedimentation tank 5, the sediment having been generated by the above-described sedimentation in the sedimentation tank 5, is returned to the primary water-treatment tank 3.

[0047] In the shown embodiment, a fluid transfer pipe 16 is disposed between a bottom portion of the sedimentation tank 5 and the primary water-treatment tank 3. Sediment 20 in the sedimentation tank 5 is withdrawn from the bottom portion of the sedimentation tank 5 by fluid transfer means 10 such as a pump, and transferred (returned) as indicated by an arrow 77 to the primary water-treatment tank 3 through fluid transfer means 9 such as a pump and the fluid transfer pipe 16.

[0048] The sediment 20 in the sedimentation tank 5, the sediment 20 having been generated by the above-described sedimentation in the sedimentation tank 5, is transferred (returned) to the primary water-treatment tank 3, mixed into the water to be treated, and then subjected to the primary treatment and the secondary treatment described above. With this, an amount of the sediment 20 in the sedimentation tank 5, the sediment 20 being generated by the above-described sedimentation in the sedimentation tank 5, can be progressively reduced, and ultimately substantially eliminated.

[0049] With this, the circulation-type waste water treatment system according to this embodiment is capable of treating, substantially without generation of sludge, the aqueous-flexographic-ink waste water that is generated when apparatuses and devices to be used for aqueous flexographic printing using aqueous flexographic ink are cleaned with water, and the waste water that is generated in the corrugated-cardboard-sheet manufacturing process.

[0050] The configuration of the circulation-type waste water treatment system according to this embodiment enables part of the treated water stored in the treated-water tank 6 to be supplied into the water to be treated that has been subjected to the above-described primary treatment in the primary water-treatment tank 3.

[0051] In the shown embodiment, a fluid transfer pipe 17 is disposed between the treated-water tank 6 and the primary water-treatment tank 3. Part of the treated water 21 stored in the treated-water tank 6 is withdrawn from the treated-water tank 6, and is transferred (returned) as indicated by an arrow 78 to the primary water-treatment tank 3 through fluid transfer means 11 such as a pump and the fluid transfer pipe 17.

[0052] As described above, since the treated water 21 in the treated-water tank 6 has been treated by using the micro-nano bubbles being the ultrafine bubbles having the diameter of 40 pm or less and containing the ozone in the primary treatment and the secondary treatment described above, the treated water 21 has become the activated water.

[0053] The treated water 21 being the water that has been activated in such a way is transferred (returned) to the primary water-treatment tank 3, and mixed into the water to be treated that is subjected to the primary treatment. With this, the primary treatment on the water to be treated in the primary water-treatment tank 3 can be performed further efficiently and effectively.

[0054] In addition, by reusing the treated water 21 in the treated-water tank 6 in such a way, an amount of water to be used, for example, in the circulation-type waste water treatment system according to this embodiment, or in facilities equipped with the circulation-type waste water treatment system according to this embodiment can be reduced. Thus, water utility costs can be reduced.

[0055] The present invention is not limited to the embodiment described hereinabove, and may be variously modified within the technical scope as defined by the claims.

Claims

1. A circulation-type waste water treatment system, comprising:a primary water-treatment tank in which primary treatment is performed on water to be treated;a secondary water-treatment tank to which primary treated water after the water to be treated has been subjected to the primary treatment in the primary water-treatment tank is supplied, and in which secondary treatment is performed on the primary treated water;a sedimentation tank to which secondary treated water after the primary treated water has been subjected to the secondary treatment in the secondary water-treatment tank is supplied; anda treated-water tank to which sediment-treated water after sedimentation has occurred by settling the secondary treated water in the sedimentation tank is supplied as treated water,the primary treatment being treatment includingwithdrawing the water to be treated stored in the primary water-treatment tank,causing the water to be treated to flow through a first micro-nano-bubble generation apparatus that generates micro-nano bubbles being ultrafine bubbles having a diameter of 40 pm or less while mixing ozone as a gas for generating the micro-nano bubbles into the water to be treated that flows through the first micro-nano-bubble generation apparatus, andjetting the water to be treated as ozone-containing micro-nano-bubble-mixed water to be treated in which the ozone-containing micro-nano bubbles generated by the mixing have been mixed, and which flows through the first micro-nano-bubble generation apparatus at a flow velocity of 15 m / sec to 25 m / sec, the jetting being performed from the first micro-nano-bubble generation apparatus into the water to be treated in the primary water-treatment tank, the secondary treatment being treatment includingwithdrawing the primary treated water stored in the secondary water-treatment tank,causing the primary treated water to flow through a second micro-nano-bubble generation apparatus that generates the micro-nano bubbles being the ultrafine bubbles having thediameter of 40 pm or less while mixing the ozone as the gas for generating the micro-nano bubbles into the primary treated water that flows through the second micro-nano-bubble generation apparatus, andjetting the primary treated water as ozone-containing micro-nano-bubble-mixed primary treated water in which the ozone-containing micro-nano bubbles generated by the mixing have been mixed, and which flows through the second micro-nano-bubble generation apparatus at the flow velocity of 15 m / sec to 25 m / sec, the jetting being performed from the second micro-nano-bubble generation apparatus into the primary treated water in the secondary water-treatment tank,sediment in the sedimentation tank, the sediment having been generated by the sedimentation in the sedimentation tank, being returned to the primary water-treatment tank.

2. The circulation-type waste water treatment system according to Claim 1, wherein part of the treated water stored in the treated-water tank is returned to the primary watertreatment tank, and is supplied into the water to be treated that has been subjected to the primary treatment in the primary water-treatment tank.

3. The circulation-type waste water treatment system according to Claim 1 or 2, whereinthe water to be treated isaqueous-flexographic-ink waste water that is generated when an apparatus and a device to be used for aqueous flexographic printing using aqueous flexographic ink are cleaned with water, orwaste water that is generated in a corrugated-cardboard-sheet manufacturingprocess.INTERNATIONAL SEARCH REPORT International application No. PCT / JP2024 / 026297A. CLASSIFICATION OF SUBJECT MATTER C02F 1 / 78(2023.0l)r,B01F 23^32(2022.01)1: B01F23 / 2373(2022.0l)r,B01F25 / 20{2022.0}.)r,B01F25 / 50{2022.0\)i FI: C02F1 / 78; B01F23 / 2373; B01F25 / 20; B01F25 / 50; B01F23 / 232 According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) C02F1 / 70-1 / 78: B01F23 / 232; B01F23 / 2373; B01F25 / 20; B01F25 / 50 Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Published examined utility model applications of Japan 1922-1996 Published unexamined utility model applications of Japan 1971-2024 Registered utility model specifications of Japan 1996-2024 Published registered utility model applications of Japan 1994-2024 Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) C. DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. A JP 2018-516753 A (NABAS GROUP, INC.) 28 June 2018 (2018-06-28) claims, drawings 1-3 A A JP 2022-169414 A (SUYAMA, Yoshimasa) 09 November 2022 (2022-11-09) claims, drawings JP 2007-069091 A (MITSUBISHI KAKOKI KK) 22 March 2007 (2007-03-22) claims, drawings 1-3 1-3 A JP 2016-159241 A (SWING CORP.) 05 September 2016 (2016-09-05) claims, drawings 1-3 A CN 109110917 A (TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY) 01 January 2019 (2019-01-01) claims, figures 1-3 | | Further documents are listed in the continuation of Box C. | J | See patent family annex. * Special categories of cited documents: “T” later document published after the international filing date or priority “A” document defining the general state of the art which is not considered date and not in conflict with the application but cited to understand the to be of particular relevance principle or theory underlying the invention “D” document cited by the applicant in die international application “X” document of particular relevance; the claimed invention cannot be “E" earlier application orpatent but published on or after the international considered novel or cannot be considered to involve an inventive step filing date when the document is taken alone •SL” document which may throw doubts on priority claim(s) or which is “Y” document of particular relevance; the claimed invention cannot be cited to establish the publication date of another citation or other considered to involve an inventive step when the document is special reason (as specified) combined with one or more other such documents, such combination “O” document referring to an oral disclosure, use, exhibition or other being obvious to a person skilled in the art means document member of the same patent family “P” document published prior to the international filing date but later than the priority date claimed Date of the actual completion of the international search 06 September 2024 Date of mailing of the international search report 24 September 2024 Name and mailing address of the ISA / JP Japan Patent Office (ISA / JP) 3-4-3 Kasumigaseki, Chiyoda-ku, Tokyo 100-8915 Japan Authorized officer Telephone No.Form PCT / ISA / 210 (second sheet) (July 2022)

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