EP2233263A2 - Schlammausstossvorrichtung, Schlammauftragsvorrichtung und Verfahren zur Herstellung einer abgedichteten Wabenstruktur - Google Patents

Schlammausstossvorrichtung, Schlammauftragsvorrichtung und Verfahren zur Herstellung einer abgedichteten Wabenstruktur Download PDF

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Publication number
EP2233263A2
EP2233263A2 EP10250533A EP10250533A EP2233263A2 EP 2233263 A2 EP2233263 A2 EP 2233263A2 EP 10250533 A EP10250533 A EP 10250533A EP 10250533 A EP10250533 A EP 10250533A EP 2233263 A2 EP2233263 A2 EP 2233263A2
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EP
European Patent Office
Prior art keywords
slurry
ejection
longitudinal direction
nozzle portion
ejection port
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10250533A
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English (en)
French (fr)
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EP2233263B1 (de
EP2233263A3 (de
Inventor
Naoto Kouketsu
Yoshinori Mizuno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
NGK Ceramic Device Co Ltd
Original Assignee
NGK Insulators Ltd
NGK Ceramic Device Co Ltd
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Publication of EP2233263A2 publication Critical patent/EP2233263A2/de
Publication of EP2233263A3 publication Critical patent/EP2233263A3/de
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Publication of EP2233263B1 publication Critical patent/EP2233263B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/003—Apparatus or processes for treating or working the shaped or preshaped articles the shaping of preshaped articles, e.g. by bending
    • B28B11/006—Making hollow articles or partly closed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs

Definitions

  • the present invention relates to a slurry ejection apparatus,aslurryapplication apparatus,and a method for manufacturing a plugged honeycomb structure.
  • Exhaust gas discharged from a diesel engine or the like contains a large amount of particulate matter (PM) containing soot (carbon graphite) and the like, and PM causes air pollution.
  • PM particulate matter
  • a filter of a ceramic is mounted for trapping PM, and a plugged honeycomb structure is employed for the filter (see, e.g., JP-A-2001-269585 ).
  • a plugging portion plugs an end portion of each of the cells extending through in the axial direction.
  • the cells having no plugging portions on the inlet side have plugging portions on the outlet side, and the cells having plugging portions on the inlet side have no plugging portions on the outlet side.
  • the plugging portions are disposed in a checkerwise pattern when the plugged honeycomb structure is viewed from an end face.
  • a honeycomb formed article obtained by forming kneaded clay constituted of ceramic raw materials into a honeycomb shape is manufactured, and ceramic slurry (hereinbelow referred to as "slurry") is filled in end portions of cells of the honeycomb formed articles, followed by firing.
  • slurry ceramic slurry
  • a firing shrinkage ratio is different between the slurry and the honeycomb formed article, there is caused a difference in shrinkage ratio upon firing between the portions where the slurry is filled and the portions where no slurry is filled. Therefore, when the slurry is not filled into end portions of the cells with uniform depth, by uneven shrinkage upon firing, a plugged honeycomb structure having a crack or a strain therein is manufactured.
  • the cells having deep plugging have short f low passages to decrease the area of the partition walls where the target gas to be treated can pass, that is, the area of the filter.
  • the filter area also has a variance depending on the cells, a defect may easily be caused as trapping for the target gas to be treated is repeated.
  • JP-A-2007-269007 discloses a method for applying slurry in a state of having a flat interface on a plate-shaped container. In this method, after slurry is ejected on a plate-shaped container, the plate-shaped container is rotated to spread the slurry toward the outer peripheral side of the plate-shaped container by a centrifugal force, and the interface of the slurry is made flat.
  • JP-A-2007-269007 discloses a method for ejecting slurry by a monoaxial eccentric screw pump (mohno pump). The monoaxial eccentric screw pump has the advantage that slurry can be ejected continuously and quantitatively without pulsation.
  • the monoaxial eccentric pump Since the slurry has viscosity, when there is a bias in the flow velocity or the flow amount, unevenness is easily caused on the interface of the slurry on the plate-shaped container. Since the monoaxial eccentric pump is provided with a mechanism of imparting thrust by a rotor having an eccentric motion, it is suitable to quantitatively eject slurry having viscosity. However, when a monoaxial eccentric screw pump is used for the ejection of slurry, since the monoaxial eccentric screw pump covers a part of the discharge port because of the aforementioned mechanism with changing the covered position with the passage of time (see Fig. 15 ), a change in the slurry flow amount is caused in each position with the passage of time. Therefore, when the monoaxial eccentric screw pump is used for the ejection of slurry, unevenness is caused on the interface of the slurry applied on the plate-shaped container in a flat state.
  • the present invention aims to provide a slurry ejection apparatus for ejecting slurry with relaxing the bias in the flow velocity and the flow amount, a slurry application apparatus for applying slurry in a plane state so as to have a flat interface, and a method for manufacturing a plugged honeycomb structure, the method being capable of filling slurry in the cells with uniform depth.
  • the present inventors As a result of the present inventors' earnest study centering around the configuration of the nozzle portion where the slurry is ejected in order to solve the aforementioned problems, they found a configuration of a nozzle portion where the slurry can be ejected almost uniformly, which led to the completion of the present invention. That is, according to the present invention, there are provided the following slurry ejection apparatus, slurry application apparatus, and method for manufacturing a plugged honeycomb structure.
  • a slurry ejection apparatus comprising: a container portion containing slurry therein and having a discharge port for discharging the slurry, a thrust-imparting portion disposed in the container portion and extruding the slurry toward the discharge port, and a nozzle portion provided with a feed port communicating with the discharge port and allowing the slurry to flow into the nozzle portion and a slit-shaped ejection port for ejecting the slurry flowed into the nozzle portion; wherein the ejection port is formed with a fixed length in the width direction of the ejection port in each position in a longitudinal direction of the discharge port to almost uniformalize an ejection amount per unit time of the slurry in each position in the longitudinal direction of the ejection port.
  • a slurry application apparatus comprising: a slurry ejection apparatus according to any one of [1] to [6], and a storage portion having a flat bottom face and receiving the slurry ejected from the slurry ejection apparatus; wherein the nozzle portion is provided over the bottom face, the ejection port of the nozzle portion faces the bottom face, the nozzle portion moves at a fixed speed relatively with respect to the bottom face with ejecting the slurry from the ejection port to apply the slurry in a plane state on the bottom face.
  • the slurry application apparatus comprising a retentive member for retaining a shape of an interface of the slurry while suppressing a flow of the slurry after the slurry is applied on the bottom face, wherein the retentive member is detachable from the bottom face and has a ring-shaped wall portion for surrounding the slurry applied on the bottom face, and the wall portion is provided with a lower face to adhere to the bottom face.
  • a method for manufacturing a plugged honeycomb structure wherein a slurry application apparatus in [7] or [8] is used, and the method has a step where, after the slurry is applied on the bottom face in a plane state, an end face where cells are open of a honeycomb formed article is immersed in the slurry to fill the slurry into the cells.
  • a slurry ejection apparatus of the present invention exhibits an effect in ejecting slurry with relaxing a bias in the flow velocity and the flow amount.
  • a slurry application apparatus of the present invention exhibits an effect in applying slurry in a plane state to obtain a flat interface.
  • a method for manufacturing a plugged honeycomb structure of the present invention exhibits an effect in filling slurry into the cells with uniform depth.
  • FIG. 1 is a view schematically showing a cross section of an embodiment of a slurry ejection apparatus of the present invention.
  • FIG. 2 is a perspective view of the nozzle portion of a slurry ejection apparatus of the present invention when seen from the ejection port side.
  • Fig. 3 is a plan view of the nozzle portion shown in Fig. 2 when seen from the ejection port side.
  • Fig. 4A is a vertical cross-sectional view of the nozzle portion in the A-A' cross section along the longitudinal direction of the ejection port shown in Fig. 2 .
  • Fig. 4B is a vertical cross-sectional view of the nozzle portion in the B-B' cross section along the width direction of the ejection port shown in Fig. 2 .
  • Fig. 5 is an enlarged view showing the ejection port in the plan view of Fig. 3 .
  • Fig. 6 is an enlarged view showing a plan view of a rectangular ejection port.
  • Fig. 7 is a view schematically explaining the ejection amount per unit time of slurry in each position along the longitudinal direction of the ejection port of a slurry ejection apparatus of the present invention.
  • Fig. 8 is a view schematically explaining the ejection amount per unit time of slurry in each position along the longitudinal direction of the ejection port of a slurry ejection apparatus not belonging to the present invention.
  • Fig. 9A is an enlarged plan view of an ejection port of a nozzle portion.
  • Fig. 9B is an enlarged plan view of an ejection port of a nozzle portion.
  • Fig. 9C is an enlarged plan view of an ejection port of a nozzle portion.
  • Fig. 9D is an enlarged plan view of an ejection port of a nozzle portion.
  • Fig. 10 is a horizontal cross-sectional view of a nozzle portion in the C-C' cross section shown in Fig. 2 , showing a cross section of the tip portion of the nozzle portion.
  • Fig. 11 is a schematic view of a slurryejection apparatus provided with a configuration where slurry is allowed to continuously flow to the ejection port in the longitudinal direction.
  • Fig. 12 is a schematic view of a slurryejection apparatus provided with a configuration where slurry is allowed to discontinuously flow in the longitudinal direction to the ejection port.
  • Fig. 13A is a view schematically showing a flow velocity distribution of slurry along the longitudinal direction of the ejection port at the position U in Figs. 11 and 12 .
  • Fig. 13B is a view schematically showing a flow velocity distribution of slurry along the longitudinal direction of the ejection port at the position L in Fig. 11 .
  • Fig. 13C is a view schematically showing a flow velocity distribution of slurry along the longitudinal direction of the ejection port at the position L in Fig. 12 .
  • Fig. 14 isavertical cross section of a container portion provided with an monoaxial eccentric screw pump therein as the thrust-imparting portion.
  • Fig. 15 is a horizontal cross section taken along the A-A' in Fig. 14 of the container portion provided with an monoaxial eccentric screw pump therein as the thrust-imparting portion.
  • Fig. 16 is a view schematically showing a slurry application apparatus of the present invention applying slurry.
  • Fig. 17 is a view of application of slurry shown in Fig. 16 when seen from the top side of the bottom face.
  • Fig. 18 is a view schematically showing a slurry application apparatus with a storage portion having a side wall of the present invention applying slurry.
  • Fig. 19 is a view schematically showing the application of the slurry shown in Fig. 18 when seen from the top side of the bottom face.
  • Fig. 20 is a front view (top) of an embodiment of a retentive member and a vertical cross-sectional view of a A-A' cross section.
  • Fig. 21 is a plan view of a storage portion, schematically showing the retentive member suppressing the flow of the slurry applied on the bottom face when seen from the top.
  • Fig. 22 is a vertical cross-sectional view along the A-A' of the storage portion and the retentive member shown in Fig. 21 .
  • Fig. 23 is a view schematically showing an end face of a honeycomb formed article being immersed in the slurry applied on a bottom face of the storage portion shown in Fig. 22 .
  • the "flow passage” means a cylindrical or tubular member forming a space where the slurry 10 flows inside the slurry ejection apparatus 1.
  • the "flow passage cross section” means a cross section perpendicular to the flow direction of the slurry 10 among the cross sections of the internal space where the slurry 10 flows of the container portion 2 and the nozzle portion 4.
  • the "slurry" here contains at least a ceramic powder and a dispersion solvent, and the composition can be selected in accordance with the purpose of use.
  • the slurry can be prepared by, for example, kneading a mixture of a ceramic powder and a dispersion powder for ceramic.
  • the ceramic powder There is no particular limitation on the kind of the ceramic powder, and examples of the ceramic power include a silicon carbide powder and a cordierite powder.
  • the aforementioned slurry has a viscosity of preferably 50 to 900 dPa ⁇ s, particularly preferably 100 to 500 dPa ⁇ s.
  • a viscosity of the slurry is below 50 dPa ⁇ s, since the flowability of the slurry is too high, the slurry involuntarily flows regardless of the thrust-imparting portion. For example, when the ejection port 12 faces downward as in Fig. 1 , the slurry may flow out under its own weight without being retained in the nozzle.
  • the "slit-shaped" here means that the length in the longitudinal direction 8 of the ejection port 12 is sufficiently larger than the length in the width direction perpendicular to the length in the longitudinal direction.
  • an ejection port 12 where the percentage of the maximum length in the width direction 9 with respect to the length in the longitudinal direction 8 of the ejection port 12 is 20% or less is determined as a slit-shaped ejection port 12. It is further preferable that the percentage of the maximum length in the width direction 9 with respect to the length in the longitudinal direction 8 of the ejection port 12 is 10% or less.
  • the longitudinal direction means the longitudinal direction 8 of the ejection port 12.
  • the width direction 9 means the direction perpendicular to the longitudinal direction 8 and direction of the width of the ejection port 12.
  • Fig. 4A is a cross-sectional view taken along A-A' shown in Fig. 2 , that is, a vertical cross-sectional view of the nozzle portion 4 along the longitudinal direction 8 of the ejection port 12.
  • Fig. 4B is a cross-sectional view taken along B-B' shown in Fig. 2 , that is, a vertical cross-sectional view of the nozzle portion 4 along the width direction 9 of the ejection port 12.
  • the nozzle portion 4 is provided with a feed port 11.
  • the feed port 11 communicates with the discharge port 20. Therefore, the slurry 10 which has flowed to the discharge port 20 through the container portion 2 flows into the nozzle portion 4 from the feed port 11 (see Fig. 1 ).
  • the shape of the feed port 11 can be determined arbitrarily and does not have to the same slit shape as in the ejection port 12.
  • the shape of the feed port 11 has a widely opened shape like the discharge port 20 so that the slurry 10 can easily flow into the nozzle portion 4.
  • a flow passage having a large cross-sectional area In the nozzle portion 4 is formed a flow passage having a large cross-sectional area.
  • a buffer portion 13 is provided, and a configuration capable of storing slurry in the buffer portion 13 may be employed.
  • the feed port 11 In each of the nozzle portions 4 shown in Figs. 4A and 4B , the feed port 11 is widely opened, and the buffer portion 13 is formed in such a manner that the area of the flow passage cross section in the vicinity of the feed port 11 is the same as the opening area of the feed port 11.
  • the configuration of the buffer portion 13 can be determined in accordance with the state of inflow of the slurry 10 from the feed port 11 and properties of the slurry 10. However, since the effect decreases as the slurry viscosity is lowered, a buffer layer is positioned subsidiarily.
  • the buffer portion 13 is formed in such a manner that one of the end portions functions as the feed port 11.
  • the buffer portion 13 does not have to have a configuration as shown in Figs. 4A or 4B .
  • the buffer portion 13 can be formed also in such a manner that the area of the flow passage cross section is gradually reduced toward the ejection port 12 side.
  • Fig. 5 is an enlarged view of the ejection port 12 in the plan view of the nozzle portion 4 of Fig. 3 .
  • the ejection port 12 of the nozzle portion 4 provided on a slurry ejection apparatus 1 can have a configuration capable of ejecting the slurry 10 at an almost uniform flow amount along the longitudinal direction 8 even in the case that the slurry 10 flows to the ejection port 12 with variance in the flow velocity in the longitudinal direction 8.
  • the ejection port 12 is formed with a fixed length in the width direction 9 in each position in the longitudinal direction 8 so that the slurry 10 ejection amount per unit time in each position in the longitudinal direction 8 becomes almost the same.
  • the shape of the ejectionport 12 maybe a simple rectangle (oblong figure) shown in Fig. 6 .
  • This case is also within the range of the aforementioned technical concept because the length in the width direction 9 of the ejection port 12 is fixed so that the slurry 10 ejection amount per unit time in each position in the longitudinal direction 8 becomes almost the same.
  • Fig. 7 is a view schematically showing the relation between the lengths W a and W b in the width direction 9 of the ejection port 12 and the slurry 10 ejection amounts per unit time (hereinbelow referred to as "unit ejection amounts") V a and V b in the positions a and b, respectively, along the longitudinal direction 8.
  • Fig. 7 shows the slurry 10 being ejected for a predetermined unit time from the ejection port 12 drawn on the top side of Fig. 7 toward the horizontal bottom face 22 drawn on the lower side.
  • the flowvelocity (v a ) of the slurry 10 is high in the position a in the center in the longitudinal direction 8, and the flow velocity (v b ) of the slurry 10 is low in the position b on the end side in the longitudinal direction 8.
  • the length W a in the width direction 9 of the ejection port 12 in the position a is made small, and the length 4V b in the width direction 9 of the ejection port 12 in the position b is made large.
  • the unit ejection amount V a in the position a and the unit ejection amount V b in the position b are almost the same, and thereby the height T a of the slurry 10 ejected from the position a and the height T b of the slurry 10 ejected from the position b are almost the same on the bottom face 22. That is, a flat interface 30 of the slurry 10 appears on the bottom face 22.
  • Fig. 8 schematically shows a case that the slurry 10 is ejected from the ejection port 12 having a simple rectangular shape when the flow velocity of the slurry 10 has a bias in the same state as the case of Fig. 7 as an example in contrast to the case shown in Fig. 7 .
  • the unit ejection amount V a of the slurry 10 in the position a is large, and the unit ejection amount V b of the slurry 10 in the position b is small.
  • the height T a of the slurry 10 ejected from the position a is larger than the height T b of the slurry 10 ejected from the position b, and the interface 30 of the slurry 10 has unevenness with the center in the longitudinal direction 8 being higher than a portion on the end side.
  • the shape of the ejection port 12 shown in Figs. 5 and 7 may be changed to the shape shown in Fig. 9A .
  • the unit ejection amount V a in the position a is def ined as the ejection amount of the slurry passing per unit time though the flow passage cross section S a in a gap g set so as to have a predetermined length in the longitudinal direction 8 in the position a. That is, the unit ejection amount V a is shown by a value obtained by multiplying the area of the flow passage cross section S a in the gap by the flow velocity v a of the slurry 10 flowing the cross section S a .
  • the length of the gap g is obtained in accordance with the degree of uniformity of the unit ejection amount obtained for each actual embodiment.
  • the uniformity of the depth of filling of the slurry 10 in the cells in the end portions of a honeycomb formed article depends on the flatness of the interface 30 the slurry 10 (filling of slurry in cells will be described later).
  • the interface 30 of the slurry 10 in the position where the cell is immersed is high, that is, the unit ejection amount of the slurry 10 is large. in this case, based on the depth of filling of the slurry 10, the length in the width direction 9 of the ejection port 12 in the corresponding position can be modified to be small.
  • nozzle portion 4 In order to take advantage of the aforementioned function effect by the configuration of the nozzle portion 4, it is preferable to allow the nozzle portion 4 to have a configuration where the slurry is allowed to flow to the ejection port 12 so that the difference in flow velocity of the slurry 10 in each position in the longitudinal direction 8 is reduced. Therefore, it is preferable that the nozzle portion 4 has a flow passage having a slit-shaped flow passage cross section formed up to the ejection port 12 and is provided with a tip portion 14 which send the slurry 10 to the ejection port 12 continuously in the longitudinal direction 8.
  • Fig. 10 is a cross-sectional view taken along the C-C' shown in Fig. 2 , i.e., a vertical cross-sectional view of the nozzle portion 4. The position of the C-C' cross section is shown in the vertical cross-sectional views of Figs. 4A and 4B .
  • Fig. 13A shows a distribution of the flow velocity of the slurry 10 along the longitudinal direction 8 at the upstream end of the tip portion 14 shown by the position U in Fig. 11 .
  • Fig. 13B shows a distribution of the flow velocity of the slurry 10 along the longitudinal direction 8 at the ejection port 12 shown by the position L in Fig. 11 .
  • the flow of the slurry 10 having high velocity becomes slow by the resistance of the flow of the slurry 10 having low flow velocity.
  • the flow of the slurry 10 having low flow velocity becomes fast by being pulled by the flow of the slurry 10 having high velocity. Therefore, as shown in Fig. 13B , in the ejection port 12, the slurry 10 has a relaxed variance in flow velocity of the slurry 10 along the longitudinal direction 8.
  • the length of the flow passage of the tip portion 14 may be adjusted in accordance with variance in flow velocity of the slurry 10 along the longitudinal direction 8.
  • the variance in the flow velocity of the slurry 10 along the longitudinal direction 8 is large, by increasing the flow passage length of the tip portion 14, the variance in the flow velocity of the slurry 10 can effectively be relaxed.
  • the tip portion 14 having such a configuration is provided on the nozzle portion 4, since the slurry 10 can be ejected with small variance in the flow velocity along the longitudinal direction 8, the length in the width direction 9 of the ejection port 12 described earlier with referring to Fig. 7 can be set more precisely.
  • the tip portion 14 having such a configuration is provided on the nozzle portion 4 (the details will be described later).
  • the tip portion 14 may have a configuration where the continuity of the slurry along the longitudinal direction 8 is temporarily segmentalized in the middle of the flow passage.
  • the tip portion 14 is branched into a comb shape and is not formed to allow the slurry 10 to continuously flow to the ejection port 12 over the longitudinal direction 8.
  • the flow velocity of the slurry 10 at the position U of the tip portion 14 in Fig. 12 is the same as that at the position U of Fig. 11 , since relaxation of the flow velocity of the slurry 10 like the tip portion 14 in Fig. 11 is not conducted, as shown in Fig. 13C , the slurry is ejected from the ejection port 12 with the variance in the flow velocity of the slurry along the longitudinal direction 8 being kept large.
  • a slurry ejection apparatus 1 of the present invention there can effectively be employed a configuration where the slurry 10 is extruded with the thrust-imparting portion 3 causing biases in the flow amount and the flow velocity.
  • a thrust-imparting portion 3 having such a configuration, there is a portion where the discharge port 20 is partially covered to allow the slurry 10 to flow into the nozzle portion 4 by increasing the average flow amount of the slurry in the center in the longitudinal direction 8 and decreasing the average f low amount of the slurry 10 at the ends in the longitudinal direction 8 with changing the position and the area where the discharge port 20 is covered with the passage of time.
  • the length in the width direction 9 is formed to be small in the center in the longitudinal direction 8 and maximized at the ends in the longitudinal direction or in the vicinity of the ends in the longitudinal direction 8 in order to relax the steady bias of the average flow velocity along the longitudinal direction 8.
  • the ejection port 12 of the nozzle portion 4 is formed in such a manner that the length in the width direction 9 is small in the center in the longitudinal direction 8 and maximized at the ends in the longitudinal direction 8 or in the vicinity of the ends in the longitudinal direction 8. Examples of the ejection port 12 of a nozzle portion 4 having such a configuration are shown in Figs. 9C and 9D .
  • the slurry When slurry flows through the tip portion 14, the slurry is subjected to resistance from the flow passage wall face on the end side in the longitudinal direction 8 of the tip portion 14.
  • the ejection port 12 of the nozzle portion 4 when the length in the width direction 9 is formed to be the maximum at the ends in the longitudinal direction 8 or in the vicinity of the ends in the longitudinal direction 8, the ejection amount along the longitudinal direction 8 easily becomes more uniform.
  • the nozzle portion 4 can have a configuration where the length in the width direction 9 of the ejection port 12 is the smallest in the center in the longitudinal direction 8 and increases toward the ends in the longitudinal direction 8.
  • Fig. 14 shows a vertical cross section of the container portion 2 having the monoaxial eccentric screw pump 61 as the thrust-imparting portion 3 therein.
  • screw shaped rotor 62 and stator 63 are disposed inside the container portion 2.
  • Fig. 15 shows a horizontal cross section along A-A' in Fig. 14 and continuously shows a reciprocating motion of the discharge end portion 65 in the rotor 62.
  • the stator 63 has an oblong space cross section.
  • the rotor 62 has a circular cross section and fits into the oblong space of the stator 63.
  • the discharge end portion 65 of the rotor 62 reciprocates along the longitudinal direction 8 when viewed from a horizontal cross section of the discharge port 20.
  • the flow of the slurry 10 has a bias along the longitudinal direction 8. By this mechanism, the slurry 10 is discharged from the discharge port 20 with the bias of the flow being fluctuated.
  • the discharge port 20 is partially covered by the discharge end portion 65, and the slurry 10 flows into the nozzle portion 4 with changing the position and the area where the discharge port 20 is covered by the discharge end portion 65 with the passage of time so that the average flow amount of the slurry 10 is increased in the center of the longitudinal direction 8 and that the average flow amount of the slurry 10 is decreased at the ends in the longitudinal direction 8.
  • the slurry 10 flows into the nozzle portion 4 along the longitudinal direction 8 in the state that the average flow amount in the central portion is large and that the average flow amount on the end sides is small.
  • the velocity of the slurry 10 is high in the center of the ejection port 12 and low on the end sides in the longitudinal direction 8.
  • the unit ejection amount of the slurry 10 becomes almost uniform along the longitudinal direction 8. Since this tendency becomes more remarkable as the percentage of the length in the axial direction 9 with respect to the length in the longitudinal direction 8 of the ejection port 12 increases, in the case that the uniformity of the unit ejection amount of the slurry 10 along the longitudinal direction 8 is strict, as shown in Fig. 5 or Fig. 9A , a configuration where the length in the width direction 9 of the ejection port 12 is also continuously changed along the longitudinal direction 8 is more preferable.
  • a slurry application apparatus completed by the present inventors (hereinbelow referred to as a "slurry application apparatus of the present invention") will be described.
  • Fig. 16 schematically shows a slurry application apparatus 21 of the present invention applying the slurry 10 on the bottom face 22.
  • Fig. 17 is a view of the application of the slurry 10 shown in Fig. 16 when seen from the top side of the bottom face 22.
  • a slurry application apparatus 21 of the present invention has the aforementioned slurry ejection apparatus 1 of the present invention and a flat bottom face 22 and is provided with the storage portion 24 for receiving the slurry 10 ejected from the slurry ejection apparatus 1.
  • the nozzle portion 4 of the slurry ejection apparatus 1 is located over the bottom face 22, and the ejection port 12 of the nozzle portion 4 faces the bottom face 22.
  • a slurry application apparatus 21 of the present invention at least the nozzle portion 4 moves at a relatively fixed velocity with respect to the bottom face 22 with ejecting the slurry 10 from the ejection port 12 of the slurry ejection apparatus 1 toward the bottom face 22.
  • the slurry ejection apparatus 1 is provided in such a manner that the nozzle portion 4 moves lest the slurry 10 newly applied should overlap the slurry 10 already applied on the bottom face 22.
  • the slurry 10 is applied in a plane state on the bottom face 22, and the interface 30 of the applied slurry 10 becomes flat.
  • the moving velocity of the nozzle portion 4 can suitably be selected so as to apply the slurry 10 on the bottom face 22 with a desired height of the slurry 10 with viscosity of slurry 10, length of the ejection port 12 in the width direction 9, and the like in mind.
  • Fig. 18 shows an embodiment of a slurry application apparatus 21 of the present invention.
  • the storage portion 24 of the slurry application apparatus 21 shown in Fig. 19 has a plate shape where the side walls 23 surround the periphery of the bottom face 22.
  • the slurry 10 applied is inhibited from flowing on the bottom face 22.
  • the interface 30 of the slurry 10 is kept flat.
  • the storage portion 24 having such a configuration preferably has a plate shape where the bottom face 22 is surrounded by the side walls 23 forming a rectangle and having a start side and an end side 32 facing each other and having a length larger than the length in the longitudinal direction 8 of the discharge port 12 (see Fig. 19 ).
  • the nozzle portion 4 is provided so as to move at a fixed velocity from the inside of the start side 31 toward the inside of the end side 32 with ejecting the slurry 10. This configuration more securely inhibits the aforementioned flow of the slurry 10.
  • a slurry application apparatus 21 of the present invention can be provided with a retentive member 25 described below in order to inhibit the flow of the slurry 10 applied on the bottom face 22 and keep the flat shape of the interface 30 of the slurry 10.
  • Fig. 20 shows a configuration of the retentive member 20, and the upper view is a front view, while the lower view is a vertical cross-sectional view taken along the A-A'.
  • the retentive member 25 has a ring-shaped wall portion 26 surrounding the slurry 10 applied on the bottom face 22. Further, the lower face 40 of the wall portion 26 can adhere to the bottom face 22.
  • Figs. 21 and 22 show the retentive member 25 inhibiting the flow of the slurry 10.
  • Fig. 21 is a plan view seen from atop the bottom face 22.
  • Fig. 22 is a vertical cross-sectional view taken along the A-A' of Fig. 21 .
  • the slurry 10 is applied in a plane state in a range wider than the region surrounded by the ring of the wall portion 26 on the bottom face 22 (see Fig. 17 ).
  • the retentive member 25 is pressed from above the slurry 10 so that the slurry 10 applied on the bottom face 22 fits in the ring of the wall portion 26 to allow the lower face 40 of the wall portion 26 adhere to the bottom face 22.
  • the flow of the slurry 10 applied on the bottom face 22 is inhibited, and the interface 30 of the slurry 10 is maintained to have the initial flat shape.
  • the ring of the wall portion 26 may have any shape such as a circle, an ellipse, a quadrangle, and a triangle.
  • the shape of the ring of the wall portion 26 can be determined arbitrarily according to the shape and size of the end face of the honeycomb formed article.
  • the aforementioned slurry application apparatus 21 of the present invention may be used in a step for filling the slurry 10 at an end portion of each cell of a honeycomb formed article 51 upon manufacturing a plugged honeycomb structure.
  • the slurry 10 can be applied in a plane state in such a manner that the slurry 10 has a flat interface 30 as shown in Figs. 7 and 22 .
  • the end face 56 of the honeycomb formed article 51 is immersed in the slurry 10 in such a manner that the end face 56 where cells are open of the honeycomb formed article 51 is matched to the flat interface 30 of the slurry 10 to fill the slurry 10 in the cells with uniform depth.
  • the method for filling the slurry 10 into an end portion of each cell of the honeycomb structure 51 may be a conventionally known method which a person of ordinary skill in the art can employ.
  • An example is the method described in JP-A-2001-300922 .
  • a slurry application apparatus 21 provided with a slurry ejection apparatus 1 belonging to the present invention and a slurry application apparatus 21 provided with a slurry ejection apparatus 1 not belonging to the present invention.
  • the slurry 10 was applied in a plane state on the bottom face 22 by the use of these slurry application apparatuses 21, and the slurry 10 was filled into the end portions of the cells of the honeycomb formed article 51 to check variance in depth of filling of the slurry 10 in a plurality of cells arbitrarily selected.
  • the container portion 2 had a circular cylindrical shape, and the same monoaxial eccentric screw pump was used as the thrust-imparting portion 3 (see Fig. 1 ).
  • a buffer portion 13 of the nozzle portion 4 constituted of a cylindrical columnar-shaped flow passage having a diameter of 37 mm and formed up to the length of 3 mm from the feed port 11 toward the tip portion 14 side.
  • the length of the tip portion 14 was 25.3 mm, and the length in the longitudinal direction 8 of the ejection port 12 was 36 mm.
  • Examples 1 to 4 and Comparative Example 1 were determined depending on the shapes of the tip portion 14 and the ejection portion 12.
  • the nozzle portion 4 of Examples 1 to 4 had a shape where the ejection port 12 as shown in Figs. 3 and 5 is slit shaped with the length in the width direction 9 of the ejection port 12 being the smallest in the center in the longitudinal direction 8 and continuously increasing toward both the ends.
  • the shapes of the tip portion 14 and the ejection portion 12 of the nozzle portion 4 of each of Examples 1 to 4 are shown in Table 1.
  • the tip portion 14 was formed to have a comb shape where circular cylindrical pipes are arranged in parallel with one another with the ejection port 12 being formed at the tip of each of the circular cylindrical pipes (Table 1).
  • the slurry application apparatus 21 was provided with a slurry ejection apparatus 1 of one of Examples 1 to 4 and Comparative Example 1 and a plate-shaped storage portion 24 having a rectangular bottom face 22 having a longer side of 38 mm and a shorter side of 38 mm and side walls 23 surrounding the bottom face 22 (see Figs. 18 and 19 ).
  • the slurry application apparatuses 21 each provided with one of the slurry ejection apparatuses 1 of Examples 1 to 4 and Comparative Example 1 were the slurry application apparatus 21 of Examples 1 to 4 or Comparative Example 1.
  • the slurry 10 having the following three kinds of viscosity was prepared.
  • the viscosity of the slurry A was 176 dPa ⁇ s
  • the viscosity of the slurry B was 295 dPa ⁇ s
  • the viscosity of the slurry C was 467 dPa ⁇ s.
  • the "viscosity of the slurry” was measured with a rotary viscometer.
  • the viscometer there was used TVB-10H, rotor H7 produced by Toki Sangyo Co., Ltd. , and the measurement values were taken when 5 minutes had passed after the rotation of the rotor started with a rotation velocity of 30 rpm as the measurement conditions.
  • the slurry 10 was applied in a plane state with the combinations shown in Table 1, and an end portion of a honeycomb formed article 51 was immersed in the slurry for filling of the slurry 10.
  • the honeycomb formed article 51 was of silicon carbide and had a length of 8 inches, an outer diameter of the end faces and a cross section perpendicular to the cell extension direction of a square of 37.5 mm ⁇ 37.5 mm, and a cell density in a cross section perpendicular to the cell extension direction of 46.5 cells/cm 2 (300 cells/inch 2 ), and a partition wall thickness of about 0.3 mm.
  • the evaluation of the degree of variance in filling depth of slurry was performed independently regarding each of the slurries A to C having a difference in the viscosity.
  • the variance in filling depth of the slurry 10 when the slurry 10 applied by the slurry application apparatus 21 of each of the Examples 1 to 4 was filled in cells in an end portion of the honeycomb formed article 51 with respect to the variance in filling depth of the slurry 10 when the slurry 10 applied by the slurry application apparatus 21 of the Comparative Example 1 was filled in cells in an end portion of the honeycomb formed article 51 was obtained in percentage (%), and it was expressed by "relative variance in plugging depth".
  • the variance in the filling depth of the slurry 10 was defined as a standard deviation calculated from the measurement values obtained by arbitrarily choosing 13 cells apart from one another at almost the same interval on the end face of the honeycomb formed article 51 twice independently and measuring the filling depth of the slurry 10 in a total of 26 cells.
  • the present invention can be used as a slurry ejection apparatus, a slurry application apparatus, and a method for manufacturing a plugged honeycomb structure for applying slurry functioning as a material for plugging portions of a plugged honeycomb structure.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Coating Apparatus (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Filtering Materials (AREA)
  • Reciprocating Pumps (AREA)
EP20100250533 2009-03-26 2010-03-22 Schlammausstossvorrichtung, Schlammauftragsvorrichtung und Verfahren zur Herstellung einer abgedichteten Wabenstruktur Active EP2233263B1 (de)

Applications Claiming Priority (1)

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JP2009077822A JP5361490B2 (ja) 2009-03-26 2009-03-26 スラリー吐出装置、スラリー塗布装置、及び目封止ハニカム構造体の製造方法

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Cited By (3)

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CN103237605A (zh) * 2010-12-06 2013-08-07 兵神装备株式会社 吐出宽度可调装置和涂敷装置
CN105636708A (zh) * 2013-10-29 2016-06-01 兵神装备株式会社 吐出系统和流体的补充方法
CN115366238A (zh) * 2022-10-01 2022-11-22 佛山蓝动力智能科技有限公司 一种数码施釉机

Families Citing this family (2)

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JP5994048B2 (ja) * 2012-10-01 2016-09-21 兵神装備株式会社 吐出システム
JP6002957B2 (ja) * 2013-10-29 2016-10-05 兵神装備株式会社 吐出システム

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JP2001300922A (ja) 2000-04-18 2001-10-30 Ngk Insulators Ltd セラミック体の製造方法
JP2007269007A (ja) 2006-03-08 2007-10-18 Ngk Insulators Ltd スラリー塗布装置、及びスラリー塗布欠陥検査装置

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CN103237605A (zh) * 2010-12-06 2013-08-07 兵神装备株式会社 吐出宽度可调装置和涂敷装置
CN103237605B (zh) * 2010-12-06 2016-05-25 兵神装备株式会社 吐出宽度可调装置和涂敷装置
CN105636708A (zh) * 2013-10-29 2016-06-01 兵神装备株式会社 吐出系统和流体的补充方法
CN115366238A (zh) * 2022-10-01 2022-11-22 佛山蓝动力智能科技有限公司 一种数码施釉机
CN115366238B (zh) * 2022-10-01 2023-06-02 佛山蓝动力智能科技有限公司 一种数码施釉机

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JP5361490B2 (ja) 2013-12-04
JP2010228263A (ja) 2010-10-14
EP2233263A3 (de) 2012-05-30

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