JP2011256873A - Method for manufacturing exhaust gas processing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an exhaust gas processing apparatus constituted of holding seal materials for an exhaust gas processing body with identification information imparted on a surface thereof.SOLUTION: Printing is executed on a surface of a sheet-like inorganic fiber mat 14 by a liquid spraying device 13 which is movable in the vertical direction, and the holding seal materials 14a for holding an exhaust gas processing body 21 is cut into a predetermined shape by the punching from the inorganic fiber mat 14 with the identification information for identifying a back side thereof printed thereon. The holding seal materials with the identification information imparted thereon are wound at least around a part of an outer peripheral surface of the exhaust gas processing body, and arranged in a tubular shell.

Description

  The present invention relates to a method for manufacturing an exhaust gas treatment apparatus including a holding seal material for an exhaust gas treatment body having identification information provided on a surface thereof.

  In general, an exhaust gas treatment device is provided with an exhaust gas treatment body 21 for purifying exhaust gas and a tubular shell 23 that accommodates the exhaust gas treatment body 21 as shown in FIG. The Between the shell 23 and the exhaust gas processing body 21, a holding sealing material 14a having a predetermined thickness is disposed for the purpose of blocking a gap in the exhaust gas passage direction, preventing displacement of the exhaust gas processing body, and absorbing vibration. . Conventionally, a holding sealing material as described in Patent Document 1 is known. Such a holding sealing material is prepared by cutting a sheet material containing inorganic fibers having a predetermined thickness and resilience into a predetermined shape such as a substantially rectangular shape. The holding sealing material cut into a predetermined shape is wound around the exhaust gas processing body and introduced into the metal tubular shell together with the exhaust gas processing body.

JP 2002-349256 A

  However, in recent years, the exhaust gas purification filter such as a diesel particulate filter (DPF), a catalyst carrier carrying a catalyst for purifying exhaust gas, and the like are manufactured due to an increase (diversification) of types of exhaust gas treatment systems. The holding sealing material has been required to have distinctiveness such as product name and serial number.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a method of manufacturing an exhaust gas treatment apparatus constituted by a holding seal material for an exhaust gas treatment body having identification information provided on the surface.

  In order to achieve the above object, according to the first aspect of the present invention, the identification information capable of identifying the back surface is printed on the surface of the inorganic fiber mat composed of the sheet material containing the inorganic fibers. The holding sealing material for the exhaust gas treatment body for holding the exhaust gas treatment body by punching from the printed inorganic fiber mat is cut into a predetermined shape, and the identification information is given. The holding sealing material is wound around at least a part of the outer peripheral surface of the exhaust gas treating body and then disposed in a tubular shell.

  Product information, back and front, etc. are mistaken by giving identifiable identification information to the surface (hyomen) of each holding seal material (including the front surface (mote noodle, top surface), back surface (bottom surface), side surface, etc.) There is no fear.

  According to a second aspect of the present invention, in the method for manufacturing an exhaust gas processing apparatus according to the first aspect, the printing means includes a liquid spraying device for spraying a liquid from a liquid spraying head, and a transfer roller having a concavo-convex shape on the surface. It is at least one selected from the rolling transfer device used and the pressure transfer device using a flat plate having a concavo-convex shape on the surface.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the exhaust gas processing apparatus comprised from the holding | maintenance sealing material for exhaust gas processing bodies which provided the identification information on the surface can be provided.

The top view at the time of the relative movement of the holding | maintenance sealing material and liquid spraying apparatus of this embodiment to an X-axis direction. The top view at the time of the relative movement of the holding sealing material and liquid spraying apparatus of this embodiment to a Y-axis direction. 1 is a front view of a holding sealing material and a printing apparatus according to an embodiment. The holding sealing material of this embodiment enclosed in a shell with an exhaust gas processing body. The graph which shows the relationship between the resin adhesion rate in a holding sealing material, and the ink impregnation height in an ink impregnation test.

Hereinafter, an embodiment of a holding sealing material for an exhaust gas treating body embodying the present invention will be described with reference to FIGS.
The holding sealing material (hereinafter referred to as “holding sealing material”) 14 a for the exhaust gas treating body of the present embodiment is subjected to a printing process on the surface by a holding sealing material printing device (hereinafter referred to as “printing device”) 11. Thus, predetermined identification information such as a production number is given. The holding sealing material 14a is created by cutting out from the inorganic fiber mat 14, and the printing process by the printing apparatus 11 is performed on the inorganic fiber mat 14 before cutting out the holding sealing material 14a. The printing apparatus 11 is a liquid spraying apparatus that is an ink jet printing apparatus that performs printing by ejecting the ink composition 15 as a liquid in a granular or mist form in a separated state with respect to the inorganic fiber mat 14 that is a printing target (target). 13 is provided.

  As shown in FIG. 1, the inorganic fiber mat 14 (target) printed by the printing apparatus 11 has a substantially rectangular planar shape, and a sheet material containing inorganic fibers having a certain thickness is cut out with a certain width. It is created by. The inorganic fiber mat 14 is made of felt or non-woven fabric having a certain thickness so as to have a certain resilience. Examples of the fiber material used for the inorganic fiber mat 14 include ceramic fibers such as alumina fibers, alumina-silica fibers, silica fibers, and glass fibers. Of these fiber materials, an alumina-silica fiber excellent in heat resistance, surface pressure retention in a high temperature range, and wind erosion resistance is preferable.

  The manufacturing method of the inorganic fiber mat is not particularly limited. For example, a fiber dispersion obtained by collecting, defibrating, and laminating short fibers of about 0.5 to 10 mm or dispersing the short fibers in water is used. A mat-like fiber aggregate can be obtained by pouring into a mold and pressing and drying. The thickness of the fiber assembly is appropriately set depending on the kind of the inorganic fiber mat 14 to be applied, the kind of the exhaust gas treating body, the bulk density, and the like. The fiber assembly is preferably subjected to needle punching (needling) treatment. The needle punching process is a process performed to make the handling easy by reducing the thickness of the laminated sheet and to strengthen the fiber engagement between the laminated sheets. As the needle punching treatment, it is preferable to quantitatively orient at regular intervals in the longitudinal direction with respect to the fiber lamination direction. As a result, intricately intertwined fibers are oriented in the longitudinal direction, resulting in reinforcement between the laminations of the fiber laminate sheets.

  The inorganic fiber mat 14 uses a binder as a binder for the purpose of imparting a predetermined thickness, resilience and airtightness before cutting and forming, and preventing the scattering of fibers, and for improving the handleability when the exhaust pipe is assembled. An impregnation treatment may be performed. Examples of the binder include inorganic binders and organic binders, and organic binders are preferable from the viewpoint of the clarity of printed characters using ink. Examples of the inorganic binder include clay minerals such as montmorillonite, water glass, synthetic mica, montmorillonite, colloidal alumina, and colloidal silica. Examples of the organic binder include acrylic resins, water-soluble resins such as polyvinyl alcohol, and latexes such as acrylic rubber, nitrile rubber, acrylonitrile-butadiene rubber (NBR), and styrene-butadiene rubber (SBR). These binders may be used alone or in combination of a plurality of types. The amount of attachment (attachment rate) after drying of the organic binder in the laminated sheet is preferably more than 0% by mass and 12% by mass or less, more preferably 0.5 to 10% by mass with respect to the total weight of the holding sealing material. %, More preferably 1.0 to 10% by mass. If the organic binder is not blended in the sheet, the ink wettability is too good with respect to the inorganic fiber mat 14, so that the ink applied by the printing process may soak and the printed characters may become unclear. On the other hand, when the adhesion rate of the organic binder exceeds 12% by mass, the wettability is insufficient, so that the ink applied by the printing process may not be sufficiently adhered to the fibers constituting the inorganic fiber mat 14 and the printed characters may become unclear. There is.

  The amount of organic binder attached to the fiber sheet is represented by weight loss due to heating (heating loss rate (%)). For example, it is measured by the following procedure. First, the weight of the magnetic dish (A) as a container is measured. Next, the sample (fiber mat) after the binder treatment is put in a magnetic dish, and after drying at 110 ° C. for 60 minutes, the weight (B) is measured. Next, the sample magnetic dish is heat-treated at 600 ° C. for 60 minutes. Next, after natural cooling, after drying at 110 ° C. for 60 minutes, the weight (B ′) is measured. The weight loss by heating (%) is expressed as (weight reduction / initial mat weight) × 100, where initial mat weight (BA) −mat weight after heating (B′-A) is a weight decrease.

  The average fiber diameter of the fiber material is appropriately set according to the type of the holding sealing material, etc., but it is possible to obtain a clear print state without greatly decreasing the ink attachment property even if the resin binder attachment amount is increased. A large diameter (6 μm or more) is preferred. If the average fiber diameter is less than 6 μm, there is a risk that the printed characters will become unclear due to a decrease in ink adhesion. Moreover, there exists a possibility that scattering of an inorganic fiber from the holding sealing material 14a cannot fully be suppressed. When producing a fiber mat having a fiber diameter of 6 μm or more, among the ceramic fibers listed above, an alumina fiber is preferably applied from the viewpoint of ease of production.

  The average fiber diameter of the fiber is measured as follows, for example. First, a sample as a fiber material is pulverized under pressure (for example, 20.6 MPa). Next, the sample is homogenized by sieving and adhered to the electron microscope sample stage using double-sided tape or the like. Next, gold, platinum, and carbon were vapor-deposited on the fiber surface with respect to the fiber adhered to the sample stage, and the test body was produced. Next, while taking a photograph of the specimen under a predetermined magnification (for example, 1500 times) using an electron microscope, the fiber diameter is read from the photograph (in the case of measurement at 1500 times, measurement is possible to the 0.1 μm unit). Next, an average fiber diameter is calculated | required from the frequency distribution table which consists of the measured fiber diameter and the number.

  The inorganic fiber mat 14 prepared as described above is cut using a punching blade or the like at a position indicated by a cutting position S as shown in FIG. As shown in FIG. 4, when the holding sealing material 14a cut from the inorganic fiber mat 14 is wound around the exhaust gas treating body 21, in order to completely close the gap in the longitudinal direction of the shell 23, for example, one end in the longitudinal direction. A concave portion 14b is formed at the portion, and a convex portion 14c is formed at the other end portion to be fitted (engaged) with the concave portion 14b. When the side surfaces of the concave portion 14b and the convex portion 14c are in contact with each other, the longitudinal gap of the shell 23 can be closed. The cutting method of the inorganic fiber mat 14 is not particularly limited, and a punching blade, scissors, a cutter or the like created by bending a band-shaped metal plate is used. In consideration of the thickness, hardness, productivity, etc. of the inorganic fiber mat, a punching blade made of carbon steel is preferably used. When one inorganic fiber mat 14 is cut by a punching blade or the like, a plurality of holding sealing materials 14a (row 12 × column 3 = 36 in FIG. 1) and a peripheral portion 14d are cut out at the outer peripheral portion. The printing position on the inorganic fiber mat 14 of the printing apparatus 11 is performed corresponding to the scheduled cutting position of each holding sealing material.

  As shown in FIGS. 1 to 3, the printing apparatus 11 is arranged so as to be separated from the conveyance table 12 that can be moved forward and backward in the left-right direction and the conveyance table 12, and prints the ink composition 15 on the print target. It is comprised from the liquid spraying apparatus 13 as a means.

  The carriage 12 is configured to be able to advance and retreat in a parallel state at a predetermined movement speed by a driving means (not shown). As the material of the surface of the transport table 12, an inorganic fiber mat 14 to be described later can be mounted in a parallel state, and the mounting target is not easily moved due to vibration or the like in the middle of the transport, and particularly when there is no fear of being damaged. It is not limited. For example, a resin plate, a rubber plate, a foam, and a laminated plate in which fibers such as a nonwoven fabric and felt are laminated and coated can be used. The driving means for driving the transport table 12 is controlled by a control means (not shown). In the printing process on the surface of the inorganic fiber mat 14, the conveyance speed of the conveyance table 12 via the driving unit by the control unit and the spraying of the ink composition 15 from the liquid spraying device 13 by the control unit described later are interlocked. Is done. The feed speed of the carriage 12 at the time of printing processing is appropriately set in consideration of the quality (for example, sharpness) of printed characters, productivity, and the like.

  As described above, the liquid spraying device 13 is an ink jet printing device that performs printing by ejecting the ink composition 15 as a liquid in a granular or mist form in a separated state with respect to the inorganic fiber mat 14 that is a printing target (target). It is. The liquid spraying device 13 includes a liquid spraying head 13a that sprays the ink composition 15 onto the inorganic fiber mat 14, and a support member 13b that supports the liquid spraying head 13a. The support member 13b is arranged in a bridging manner in the width direction on the transport table 12, and is configured to be movable in the vertical direction (left and right with respect to the transport direction) by a driving unit (not shown). The liquid spray head 13a is connected to the above-described control means, and is configured to be able to eject ink particles in accordance with an image / character signal from the control means. The printing process for the inorganic fiber mat 14 is performed by the forward / backward control of the transport table 12 by the control means and the ejection control of the ink composition 15 by the control means. The size (dots) of the ink particles from the liquid spray head 13a at the time of the printing process is appropriately set in consideration of the quality of the printed characters (for example, sharpness), productivity, and the like.

  Three liquid spraying heads 13a are embedded at equal intervals in the longitudinal direction in a state in which the discharge portions of the ink composition 15 are exposed to the outside from the lower surface of the support member 13b. The method for discharging the ink composition 15 from the liquid spray head 13a is not particularly limited, and is appropriately set depending on the type of the inorganic fiber mat 14, the print pattern, and the like. For example, a method of spraying the ink composition 15 using a piezoelectric element (piezo element) whose volume is changed by applying a voltage, a bubble is formed by heating the ink composition 15, and the ink composition 15 is generated by the pressure of the bubble. The method etc. which inject | pour. Of these, a method of using a piezoelectric element in which the ink composition 15 is less denatured and head clogging is less likely to occur because no heat is used.

  The ink composition 15 used for the printing process is not particularly limited, and a known ink composition containing a dye, a pigment, or the like is used. The ink composition 15 contains water and an organic solvent as a solvent in addition to dyes and pigments. Examples of the organic solvent include polyalkylene glycols such as polyethylene glycol, alkylene glycols such as propylene glycol, pyrrolidones such as glycerin, alcohols, and the like. Examples of the dye include water-soluble dyes such as direct dyes, acid dyes, and basic dyes. Since the dye is usually used in a state dissolved in water, an organic solvent or the like, inconveniences such as precipitation hardly occur.

  Examples of the pigment include organic pigments and inorganic pigments. Examples of the organic pigment include azo pigments such as azo lake, condensed azo, and chelate azo, polycyclic pigments such as quinacridrin, phthalocyanine, anthraquinone, dioxazine, thioindigo, isoindolinone, and quinophthalone, nitro pigments, nitroso pigments, and anilines. Black etc. are mentioned. Examples of the inorganic pigment include carbon black, titanium dioxide, silica, alumina, iron oxide, iron hydroxide, and tin oxide. The pigment is usually insoluble in water and an organic solvent, and exists in a state of being dispersed as particles in the solvent. In the ink composition 15, other organic / inorganic binders, dispersants, surfactants, pH adjusters, preservatives, antioxidants, and the like can be appropriately blended as necessary.

  The viscosity of the ink composition 15 is 2 to 5 cSt at 20 ° C., preferably 3 to 4 cSt. If the viscosity of the ink composition 15 is less than 2, the ink composition 15 is likely to penetrate into the inorganic fiber mat, so that printed characters and the like may become unclear. When the viscosity of the ink composition 15 is larger than 5 cSt, the ink composition 15 is easily clogged in the liquid spray head 13a. The viscosity of the ink composition 15 can be changed mainly by changing the amount and type of a solvent such as water that dissolves the dye and pigment.

Next, the operation of the holding sealing material 14a configured as described above will be described.
First, the inorganic fiber mat 14 appropriately treated with an organic binder or the like is placed on the transport table 12. Next, the inorganic fiber mat 14 is conveyed under the liquid spraying device 13 (printing position). At that time, the inorganic fiber mat 14 is aligned so as to correspond to the cutting position S, so that each holding sealing material 14 a to be cut out faces the ink spraying position of the liquid spraying device 13.

  Next, the ink composition 15 is sprayed from the liquid spray head 13a onto the surface of the inorganic fiber mat 14, and a printing process is performed. The printing process is performed in accordance with identification information such as character information (for example, ABCDE in FIG. 1) input in advance to the control means. The control means operates the drive means of the transport table 12 in the direction of the arrow X and controls the ejection of the ink composition 15 from the liquid spray head 13a. Thereby, the printing process on the inorganic fiber mat 14 is controlled.

  For example, as shown in FIG. 1, the printing process is performed from the top (left side with respect to the conveyance direction X) to the operation direction of the conveyance table 12 from the top of the first, fifth, and ninth rows. When the printing process for one row (three holding seal materials in the side-by-side parallel state) is completed, as shown in FIG. 2, the second, sixth, and right from the top (left side with respect to the transport direction X) directly below the liquid spray head 13a. The liquid spraying device 13 moves by one row of the holding sealing material in the Y direction so that the top of the tenth row is located. Thereafter, the same printing process is repeated, and the printing process is performed on each holding sealing material on the inorganic fiber mat 14.

  Each holding sealing material 14a is cut off at the cutting position S by a punching blade or the like on the inorganic fiber mat 14 subjected to the printing process. The cut holding sealing material 14a is wound around the outer peripheral surface of the exhaust gas treating body 21, as shown in FIG. 4, and the concave portion 14b and the convex portion 14c are fitted (engaged). At this time, a seal 22 or the like may be attached to the engaging portion of the concave portion 14b and the convex portion 14c. The exhaust gas treatment device 21 around which the holding sealing material 14a is wound is press-fitted into a cylindrical metal shell 23, whereby the exhaust gas treatment device is assembled.

According to the holding sealing material 14a for the exhaust gas treating body of the present embodiment, the following effects can be obtained.
(1) In this embodiment, the inorganic fiber mat 14 is subjected to a printing process by the liquid spraying device 13 to give identification information to the surface. Accordingly, it is possible to impart identification such as a product name and a production number to the holding sealing material. Further, since the identification information is given only to one side, there is no possibility that the front and back of the holding sealing material will be mistaken.

(2) Further, more information can be imparted to the inorganic fiber mat 14 as compared with simple spraying (marking) of a colored resin paint.
(3) Further, there is no need to use a label or a colored resin paint, and there is no possibility of changing the properties of the holding sealing material because it does not cause burning in the shell of the label and the colored resin paint.

  (4) In this embodiment, the inorganic fiber mat 14 is subjected to a printing process by the liquid spraying device 13 that can perform the printing process in a state of being separated from the printing target. Therefore, it is not necessary to consider the length, width, etc. of the holding sealing material as compared with the printing method using a transfer roll, a transfer plate (stamp), etc., and the printing characters can be easily changed. it can. When it is desired to change the size or the like of the holding sealing material, the printing characters input to the control means for controlling the conveying speed of the conveying table 12 via the driving means and the spraying of the ink composition 15 from the liquid spraying device 13 By changing the type / size input information, it is possible to easily change the printed characters.

  (5) Sheet-like inorganic fibers having a predetermined thickness and resilience without pressing the inorganic fiber mat as compared with printing methods using transfer rollers and stamps such as gravure printing and letterpress printing The properties of the mat 14 are not changed further.

  (6) Further, inorganic fibers adhere to the transfer roller and the transfer plate, and the concave portions of the printing plate are clogged, and problems such as fading of printing do not occur. That is, the printing process can be clearly performed as compared with a printing method using transfer rollers and stamps such as gravure printing and letterpress printing. Thereby, the amount of the ink composition required for the printing process can be reduced.

  (7) Even when a nonwoven fabric or felt is used in the inorganic fiber mat 14, the particles of the ink composition 15 penetrate into the inside of the nonwoven fabric or the like in the vertical direction. The printed characters can be clearly confirmed from above.

  (8) In the present embodiment, the inorganic fiber mat was impregnated with an organic binder so as to have a predetermined adhesion rate. Accordingly, since the inorganic fiber mat 14 can be printed more clearly, there is no risk of mistakes such as the production number and the front and back sides.

(9) In the present embodiment, fibers having an average fiber diameter of 6 μm or more were used. Therefore, it is possible to print the inorganic fiber mat 14 more clearly.
(10) In this embodiment, just before the printing operation, the inorganic fiber mat 14 on the transport table 12 is aligned so that the predetermined holding sealing material at the cutting position S faces the printing position of the liquid spraying device 13. Accordingly, a printing process is performed on each surface of each holding sealing material to be cut out.

In addition, you may change the said embodiment as follows.
The color of the ink composition 15 may be a single black color, or may be a color ink composition by adding an ink composition such as cyan, magenta, and yellow.

  -In the said embodiment, each holding sealing material 14a was cut out from the inorganic fiber mat 14 after the printing process. However, printing processing may be performed by the printing apparatus 11 after cutting out each holding sealing material 14 a from the inorganic fiber mat 14.

  In the above embodiment, a printing process is performed on the surface of the inorganic fiber mat 14 by moving the transport table 12 in the X direction and the liquid spraying device 13 in the Y direction. However, a printing process may be performed by fixing the transport table 12 and operating only the liquid spraying device 13. Alternatively, the liquid spraying device 13 may be fixed and the printing process may be performed by operating only the transport table 12.

  The number of liquid spray heads 13a attached to the support member 13b of the liquid spray device 13 is not particularly limited, and may be one or two or more in consideration of printing efficiency and the like. Further, the order of printing on the inorganic fiber mat 14 is appropriately set in consideration of printing efficiency and the like.

-In the said embodiment, the number of the holding sealing materials cut off from an inorganic fiber mat is not specifically limited, What is necessary is just 1 or 2 or more.
-In the said embodiment, the exhaust-gas processing body in which a holding sealing material is used is comprised by exhaust-gas purification filters for collecting PM, such as a diesel particulate filter (DPF), ceramics, etc., and exhaust gas. It may be a catalyst carrier on which a catalyst for purification is supported.

  In the above embodiment, the surface of the inorganic fiber mat 14 is subjected to a printing process using an inkjet method in which the ink composition 15 is sprayed from the liquid spray head 13a. However, the printing process is not limited to the ink jet method, and a rolling transfer device using a transfer roller having a concavo-convex shape on the surface thereof such as gravure printing and letterpress printing, a flat plate having a concavo-convex shape on the surface thereof such as a stamp. The used pressure transfer device may be used. Even when printing processing is performed using a rolling transfer device or a pressure transfer device, a large amount of identification information can be attached to the surface of the inorganic fiber mat 14.

  In the above embodiment, the holding sealing material 14a is wound around the entire outer peripheral surface of the exhaust gas treating body 21 as shown in FIG. However, the holding sealing material may be configured to be wound around at least a part of the outer peripheral surface of the exhaust gas processing body.

  In the above embodiment, the identification information is provided on the inorganic fiber mat 14 by a printing process using the liquid spraying device 13. However, the identification information may be given by a method other than the printing unit. As a method other than the printing means, it may be applied by attaching a seal member (label) on which identification information is recorded (described), attaching an IC chip on which identification information is recorded, or the like. In such a configuration, it is possible to attach without using a printing apparatus or the like, so that identification information can be easily given.

  In the above embodiment, the identification information provided on the sheet material by the printing means is not particularly limited, and may be not only character information but also a number, a symbol, a barcode, a QR code that is a kind of two-dimensional code, and the like. . Also, the content of the identification information is not particularly limited, and examples include product name, product number, serial number, basis weight, product type, weight, product size, applicable vehicle type, and distinction between front and back.

  -In the said embodiment, the provision of the printing character was performed only to the single side | surface of the holding sealing material. However, the printing position is not particularly limited, and printing processing may be performed on both sides, the back surface, the side surface, and the like.

Next, the embodiment will be described more specifically.
About the holding | maintenance sealing material of Test Examples 1-8 shown in Table 1, while creating by the method shown below, the ink impregnation test and the printing test were done. The results are shown in Table 1.

<Method for producing alumina silica fiber mat>
Silica sol is blended in a basic aluminum chloride aqueous solution having an aluminum content of 75 g / l and Al / Cl = 1.8 (atomic ratio) so that the composition of alumina fibers is alumina: silica = 72 ± 2: 28 ± 2. In addition, an alumina fiber precursor is formed. Further, an organic polymer such as polyvinyl alcohol is added to the precursor of alumina fiber. Then, it concentrated and adjusted the spinning solution, and it spun by the blowing method using this spinning solution. Fibers that have been spun were cut so that the average fiber length was 12 mm, and then the alumina fiber precursors folded were stacked to produce a laminated sheet of alumina fibers. The laminated sheet of alumina fibers thus produced is subjected to needle punching at 500 points / 100 square centimeters. This was heated from normal temperature and continuously fired at a maximum temperature of 1250 ° C. to obtain a continuous laminated sheet of alumina fibers having a basis weight of 1160 g / square centimeter. At this time, the average diameter of the fibers was 7.2 μm, and the minimum diameter was 3.2 μm. The cut continuous laminated sheet was impregnated with an acrylic organic binder to obtain the holding sealing material of each test example shown in Table 1.

<Ink impregnation test>
Each holding sealing material prepared as described above is cut into a strip shape. Next, the height of the ink soaked into the holding sealing material is determined every 5 seconds up to 80 seconds with reference to the liquid level of the ink up to 80 seconds with reference to the time when one end of the holding sealing material is immersed in a dish containing 20 ml of water-soluble ink. It was measured. The results are shown in Table 1 and FIG.

<Print test (bleedability)>
About the bleeding property of the printed character at the time of performing a printing process using the inkjet-type printing apparatus on the holding | maintenance sealing material of each test example, five panelists evaluated by visually observing the printed character. Scoring was done in three stages, with 3 points when no blurring occurred on printed characters, 2 points when blurring occurred, and 1 point when blurring occurred. The average score is calculated for the scoring results of five panelists. The score is “Excellent: ◎” when the average score is 2.6 or higher, and “Good: ○” when the average score is 1.6 or higher and 2.5 or lower. In addition, the case of 1.5 points or less was evaluated as “bad: x”, and the evaluation result of the bleeding test was used. The evaluation results are shown in Table 1.

<Print test (attachment)>
Five panelists evaluated the attachment property of the ink to the fiber when the printing treatment was performed on the holding sealing material of each test example using an ink jet printing apparatus by visually observing the printed characters. The scoring was made in three stages: 3 points when the ink was sufficiently attached to the fiber, 2 points when the ink was slightly poorly attached, and 1 point when the ink was not sufficiently attached to the fiber. The average score is calculated for the scoring results of five panelists. The score is “Excellent: ◎” when the average score is 2.6 or higher, and “Good: ○” when the average score is 1.6 or higher and 2.5 or lower. In addition, the case of 1.5 points or less was evaluated as “bad: ×”, and the evaluation result of the adhesion test. The evaluation results are shown in Table 1.

表１に示される結果より、樹脂バインダが添着されていない場合、インク含浸試験において、引き上げ高さが４５ｃｍを超える結果となった。かかる場合、保持シール材に対しインクの濡れ性が良すぎるためインクが染み込みすぎて印刷文字が不鮮明になることが確認された。一方、樹脂バインダが１５質量％（試験例４）の場合、インク含浸試験において、引き上げ高さが３９ｃｍ未満となった。かかる場合、濡れ性が不足するためインクが保持シール材を構成する繊維に十分に添着せずに印刷文字が不鮮明になることが確認された。平均繊維径が７．２μｍの試験例５〜８の方は平均繊維径が５．８μｍの試験例１〜４と比べインクの染み込み高さが高いことが確認される（図５のグラフに示されるように平均繊維径７．２μｍの試験例の方が平均繊維径５．８μｍの試験例と比べインクの含浸高さが高い）。つまり、平均繊維径が太い方がインクの添着性が良好であることが確認される。また、平均繊維径が７．２μｍの試験例５〜８の方は樹脂バインダの添着量が上昇しても添着性が大きく低下しないことが確認される。つまり、図５に示されるように平均繊維径７．２μｍの試験例の方は、添着される樹脂バインダの量によってばらつきが少ないことが確認される。

From the results shown in Table 1, when the resin binder was not attached, the pulling height exceeded 45 cm in the ink impregnation test. In such a case, it was confirmed that the ink wets too much with respect to the holding sealing material, so that the ink soaks up and the printed characters become unclear. On the other hand, when the resin binder was 15% by mass (Test Example 4), the lifting height was less than 39 cm in the ink impregnation test. In such a case, it was confirmed that the printed characters were unclear because the wettability was insufficient and the ink did not adhere sufficiently to the fibers constituting the holding sealing material. It is confirmed that the test examples 5 to 8 having an average fiber diameter of 7.2 μm have a higher ink penetration height than those of Test Examples 1 to 4 having an average fiber diameter of 5.8 μm (shown in the graph of FIG. 5). As shown, the test example with an average fiber diameter of 7.2 μm has a higher ink impregnation height than the test example with an average fiber diameter of 5.8 μm. That is, it is confirmed that the thicker the average fiber diameter, the better the ink attachment property. In addition, it is confirmed that, in Test Examples 5 to 8 having an average fiber diameter of 7.2 μm, the adherability is not greatly reduced even when the amount of resin binder attached is increased. That is, as shown in FIG. 5, it is confirmed that the test example having an average fiber diameter of 7.2 μm has less variation depending on the amount of the resin binder to be attached.

Next, technical ideas that can be grasped from the above-described embodiment and other examples will be described below together with their effects.
(A) In the holding sealing material printing apparatus for printing on the surface of the holding sealing material of the exhaust gas treating body composed of the sheet-like inorganic fiber mat by using the printing means, the printing means includes a liquid spray head. A printing apparatus for holding sealing material, which is a liquid spraying apparatus for spraying liquid.

  (B) In the inorganic fiber mat from which the holding sealing material arranged in a plurality of rows is cut, the printing processing for the holding sealing material is performed for each row. Therefore, according to the invention described in (a), even if the number of holding sealing materials cut from the inorganic fiber mat is increased or decreased, a plurality of liquid spraying heads for spraying liquid (ink composition) are arranged accordingly. do not have to.

  DESCRIPTION OF SYMBOLS 11 ... Printing apparatus for holding sealing materials, 13 ... Liquid spraying apparatus as a printing means, 13a ... Liquid spraying head, 14 ... Inorganic fiber mat, 14a ... Holding sealing material, 15 ... Ink composition, 21 ... Exhaust gas treatment body, 23 ... Shell.

Claims (2)

  On the surface of an inorganic fiber mat composed of a sheet material containing inorganic fibers, identification information that can identify the back surface is printed by a printing means that can move in the vertical direction, and exhaust gas is emitted by punching from the printed inorganic fiber mat. A holding sealing material for the exhaust gas processing body for holding the processing body is cut and formed into a predetermined shape, and the holding sealing material provided with the identification information is wound around at least a part of the outer peripheral surface of the exhaust gas processing body After that, a method for manufacturing an exhaust gas treatment device, which is disposed in a tubular shell.   The printing means includes a liquid spraying device for spraying a liquid from a liquid spraying head, a rolling transfer device using a transfer roller having a concavo-convex shape on the surface, and a pressure transfer device using a flat plate having a concavo-convex shape on the surface. The method for manufacturing an exhaust gas treatment device according to claim 1, wherein the method is at least one selected from the group consisting of:

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