JP2012254587A - Method and device for cleaning of mask for sealing honeycomb structure, and method for manufacturing honeycomb filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method by which a mask for sealing honeycomb structure can be satisfactorily cleaned.SOLUTION: The cleaning method, the method being a method for cleaning the mask 1 that has a plurality of through-holes 5 running through the thickness direction D1 thereof from a top surface 1a to a bottom surface 1b, is provided with the following steps: a step wherein the mask 1 is conveyed in a conveyance direction D2 perpendicular to the thickness direction D1 of the mask; and a step wherein a cleaning solution 24 is sprayed towards the top surface 1a and bottom surface 1b of the conveyed mask 1, from two-fluid spray nozzles 26a, 26b, in the axial direction of the through-holes 5. The axis A3 along which the cleaning solution 24 is sprayed towards the top surface 1a and the axis A4 along which the cleaning solution 24 is sprayed towards the bottom surface 1b are separated from each other in the conveyance direction D2.

Description

  The present invention relates to a cleaning method and cleaning apparatus for a honeycomb structure sealing mask, and a method for manufacturing a honeycomb filter.

  Conventionally, it is known that a honeycomb filter is used for a DPF (Diesel particulate filter) or the like. The honeycomb filter has a structure in which one end side of some of the through holes of the honeycomb structure having a large number of through holes is sealed with a sealing material, and the other end side of the remaining through holes is sealed with a sealing material.

  When only a desired through hole on one end side of the honeycomb structure is sealed with a sealing material, a sealing mask having a through hole provided at a position corresponding to the through hole to be sealed of the honeycomb structure is used. The following Patent Documents 1 and 2 describe a method of sealing a honeycomb structure using a sealing mask.

JP-A-2004-290766 JP 2008-132749 A

  By the way, the sealing mask used in the sealing step is for removing foreign matters (sealing material remaining in the mask in the sealing step, dust in the air, etc.) attached to the mask from the viewpoint of repeatedly using the mask. Washed. However, with the conventional method for cleaning a sealing mask, it is difficult to sufficiently remove foreign matter adhering to the inner wall of the through hole, and it is difficult to clean the sealing mask well. For this reason, the mask cleaning method is required to clean the mask better than the conventional method.

  The present invention has been made in view of such circumstances, and it is preferable to provide a honeycomb structure sealing mask having a plurality of through holes penetrating in a thickness direction from one main surface to the other main surface. It aims at providing the washing | cleaning method and washing | cleaning apparatus which can be wash | cleaned. Another object of the present invention is to provide a method for manufacturing a honeycomb filter using a mask cleaned by such a cleaning method.

  A cleaning method according to the present invention is a cleaning method for a honeycomb structure sealing mask having a plurality of through holes penetrating in a thickness direction from one main surface to the other main surface, wherein the mask is disposed in the thickness direction. And a step of spraying the cleaning liquid in the axial direction of the through-hole from the two-fluid nozzle on each of one main surface and the other main surface of the mask to be conveyed, The spray axis of the cleaning liquid sprayed on the main surface and the spray axis of the cleaning liquid sprayed on the other main surface are separated from each other in the mask transport direction.

  In the cleaning method according to the present invention, since the cleaning liquid is sprayed from the two-fluid nozzle, it is possible to supply the mist composed of the fine particles of the cleaning liquid to the main surface of the mask and easily remove foreign matters from the mask. . In the cleaning method according to the present invention, the cleaning liquid is easily supplied into the through hole by spraying the cleaning liquid in the axial direction of the through hole, and the inside of the through hole can be sufficiently cleaned. Further, in the cleaning method according to the present invention, the spray axis of the cleaning liquid sprayed on one main surface and the spray shaft of the cleaning liquid sprayed on the other main surface are separated from each other in the mask transport direction. ing. In this case, in the cleaning method according to the present invention, the cleaning liquid is sprayed on each of the one main surface and the other main surface, but the same penetration is made from each of the one main surface side and the other main surface side. Simultaneous supply of the cleaning liquid into the holes is suppressed. Thereby, it is suppressed that the cleaning with the cleaning liquid supplied from one main surface side is hindered by the cleaning liquid supplied from the other main surface side. According to the cleaning method according to the present invention as described above, it is possible to sufficiently remove the foreign matter adhering to the inner wall of the through hole in addition to the foreign matter adhering to the main surface of the mask, and clean the mask satisfactorily. be able to.

  In the cleaning method according to the present invention, the mask is transported with one main surface facing upward and the other main surface facing downward, and the spray axis of the cleaning liquid sprayed onto one main surface is the other. It is preferable to be located downstream of the spray axis of the cleaning liquid sprayed with respect to the main surface. In this case, it is assumed that the cleaning liquid supplied to the inside of the through hole from the other main surface side facing downward passes through the inside of the through hole while removing the foreign matter and adheres to one main surface facing upward. In addition, the cleaning liquid adhering to one main surface can be removed by the cleaning liquid sprayed on the downstream side in the transport direction. Thereby, the mask can be more satisfactorily cleaned.

  A method for manufacturing a honeycomb filter according to the present invention includes a step of cleaning a mask by the above-described cleaning method, and a step of supplying a sealing material to some through holes of the honeycomb structure through the cleaned mask. In the method for manufacturing a honeycomb filter according to the present invention, the sealing material can be supplied to the through-holes of the honeycomb structure through the mask from which foreign matters are sufficiently removed by the above-described cleaning method. A sealed honeycomb filter can be easily obtained.

  A cleaning device according to the present invention is a cleaning device for a honeycomb structure sealing mask having a plurality of through holes penetrating in a thickness direction from one main surface to the other main surface, and the mask is disposed in the thickness direction. And a two-fluid nozzle that sprays the cleaning liquid in the axial direction of the through hole with respect to each of one main surface and the other main surface of the mask to be transferred, The spray axis of the cleaning liquid sprayed on the main surface and the spray axis of the cleaning liquid sprayed on the other main surface are separated from each other in the mask transport direction.

  In the cleaning apparatus according to the present invention, it is possible to supply mist composed of fine particles of the cleaning liquid to the main surface of the mask by spraying the cleaning liquid from the two-fluid nozzle, and it is easy to remove foreign substances from the mask. Moreover, in the cleaning apparatus according to the present invention, the cleaning liquid is easily supplied into the through hole by spraying the cleaning liquid in the axial direction of the through hole, and the inside of the through hole can be sufficiently cleaned. Furthermore, in the cleaning apparatus according to the present invention, the spray axis of the cleaning liquid sprayed on one main surface and the spray shaft of the cleaning liquid sprayed on the other main surface are separated from each other in the mask transport direction. ing. In this case, in the cleaning device according to the present invention, the cleaning liquid is sprayed on each of the one main surface and the other main surface, but the same through hole is formed from each of the one main surface side and the other main surface side. It is possible to prevent the cleaning liquid from being supplied to the inside at the same time. Thereby, it is suppressed that the cleaning with the cleaning liquid supplied from one main surface side is hindered by the cleaning liquid supplied from the other main surface side. According to the cleaning apparatus according to the present invention as described above, it is possible to sufficiently remove the foreign matter adhering to the inner wall of the through hole in addition to the foreign matter adhering to the main surface of the mask, and to clean the mask satisfactorily. be able to.

  According to the cleaning method and the cleaning apparatus of the present invention, the foreign matter attached to the main surface of the mask for sealing a honeycomb structure having a plurality of through holes penetrating in the thickness direction from one main surface to the other main surface. In addition, the foreign matter adhering to the inner wall of the through hole can be sufficiently removed to improve the cleanliness, and the honeycomb structure sealing mask can be washed well. Moreover, according to the cleaning method and the cleaning apparatus of the present invention, it is possible to improve the cleaning efficiency of the honeycomb structure sealing mask, and to shorten the cleaning time. According to the method for manufacturing a honeycomb filter according to the present invention, a honeycomb filter in which desired through holes are reliably sealed can be easily obtained by using a mask cleaned by such a cleaning method.

1 is a drawing showing a honeycomb filter manufactured by a method for manufacturing a honeycomb filter according to an embodiment of the present invention. It is drawing which shows the flowchart of the manufacturing method of the honey-comb filter which concerns on one Embodiment of this invention. 1 is a view showing a mask cleaned by a cleaning method according to an embodiment of the present invention. It is drawing which shows the washing | cleaning apparatus which concerns on one Embodiment of this invention. It is drawing which shows 1 process of the washing | cleaning method which concerns on one Embodiment of this invention. It is drawing which shows 1 process of the washing | cleaning method which concerns on one Embodiment of this invention. It is drawing which shows 1 process of the washing | cleaning method which concerns on one Embodiment of this invention. It is drawing which shows 1 process of the washing | cleaning method which concerns on one Embodiment of this invention. It is drawing which shows 1 process of the washing | cleaning method which concerns on one Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The ratio of dimensions is not limited to that shown in the drawings.

(Honeycomb filter)
FIG. 1 is a drawing showing a honeycomb filter manufactured by the method for manufacturing a honeycomb filter according to the present embodiment. The honeycomb filter 100 can be used as a DPF, for example.

  As shown in FIG. 1, the honeycomb filter 100 is a cylindrical body having a plurality of flow paths 110a and 110b arranged in parallel to each other. The flow paths 110 a and 110 b are partitioned by a partition wall 112 that extends parallel to the central axis of the honeycomb filter 100. One end of the channel 110 a is sealed by a sealing portion 114 on one end surface 100 a of the honeycomb filter 100, and the other end of the channel 110 a is opened as a gas outlet on the other end surface 100 b of the honeycomb filter 100. On the other hand, one end of the flow path 110b is opened as a gas inlet on one end face 100a, and the other end of the flow path 110b is sealed by a sealing portion 114 on the other end face 100b.

  In the honeycomb filter 100, the flow paths 110a and the flow paths 110b are alternately arranged to form a lattice structure. The flow paths 110a and 110b are perpendicular to both end faces 100a and 100b of the honeycomb filter 100, and are arranged in a square shape when viewed from one end face side, that is, the central axes of the flow paths 110a and 110b are respectively located at the apexes of the square. Are arranged as follows. The cross-sectional shape of the flow paths 110a and 110b is, for example, a substantially square shape.

  When the honeycomb filter 100 is a cylindrical body, the length of the honeycomb filter 100 in the longitudinal direction of the flow paths 110a and 110b is, for example, 40 to 350 mm, and the outer diameter of the honeycomb filter 100 is, for example, 100 to 320 mm. The inner diameter of the cross section perpendicular to the longitudinal direction of the flow paths 110a and 110b (the length of one side when the cross-sectional shape is approximately square) is, for example, 0.8 to 2.5 mm. The thickness of the partition 112 is 0.05-0.5 mm, for example.

  The partition 112 is formed from porous ceramics (fired body). Examples of ceramics include alumina, silica, mullite, cordierite, glass, oxides such as aluminum titanate, silicon carbide, silicon nitride, and metal. The aluminum titanate can contain magnesium and / or silicon. The material of the sealing part 114 can be the same material as the partition 112.

  In the above-described embodiment, the cross-sectional shapes of the flow paths 110a and 110b are substantially square, but are not limited thereto, and may be rectangular, circular, elliptical, triangular, hexagonal, octagonal, or the like. Moreover, in the flow paths 110a and 110b, those having different diameters and those having different cross-sectional shapes may be mixed. In addition, the flow path arrangement is a square arrangement in FIG. 1, but is not limited to this, and may be an equilateral triangle arrangement or a staggered arrangement in which the central axis of the flow path is arranged at the apex of the equilateral triangle in the cross section. Good. Furthermore, the honeycomb filter 100 is not limited to a cylindrical body, and may be a triangular prism, a quadrangular prism, a hexagonal prism, an octagonal prism, or the like.

  In the honeycomb filter 100, as shown in FIG. 1B, the gas G supplied from the one end face 100a to the flow path 110b passes through the partition wall 112, reaches the adjacent flow path 110a, and is discharged from the other end face 100b. The At this time, particles in the gas G (for example, fine particles (PM) contained in exhaust gas discharged from an internal combustion engine such as a diesel engine) are removed by the partition walls 112, so that the honeycomb filter 100 functions as a filter. .

  FIG. 2 is a flowchart showing a method for manufacturing a honeycomb filter according to the present embodiment. The manufacturing method of the honeycomb filter 100 according to the present embodiment includes a cleaning step S100 for cleaning the honeycomb structure sealing mask, a preparation step S200 for preparing the honeycomb structure, and the penetration of the honeycomb structure using the cleaned mask. And a sealing step S300 for sealing the holes.

<Washing step S100>
FIG. 3 is a view showing a mask cleaned by the cleaning method according to the present embodiment in the cleaning step S100. The mask 1 has an upper surface (one main surface) 1a and a lower surface (the other main surface) 1b facing each other as the cleaning surface 3, and has a disk shape, for example. The diameter of the mask 1 is, for example, 150 to 500 mm. The thickness of the mask 1 is, for example, 0.1 to 3.0 mm. In addition, the material of the mask 1 is not specifically limited, For example, a metal and resin are mentioned.

  The mask 1 has a plurality of through holes 5 penetrating in the thickness direction from the upper surface 1a to the lower surface 1b. The through holes 5 are arranged in the same manner as the arrangement of the through holes sealed in the honeycomb structure, and are arranged in a zigzag manner, for example. The cross-sectional shape perpendicular to the axial direction of the through-hole 5 has the same cross-sectional shape as the through-hole sealed in the honeycomb structure, and is, for example, a substantially square shape. The inner diameter of the through hole 5 (the length of one side when the cross-sectional shape is substantially square) is, for example, 0.8 to 2.5 mm.

  In the cleaning step S100, the mask 1 is cleaned by removing the foreign substances from the mask 1 by supplying a cleaning liquid and dry air to the mask 1 to which foreign substances such as a sealing material adhere. The foreign matter adheres to, for example, the upper surface 1 a, the lower surface 1 b, and the inner wall of the through hole 5. The cleaning liquid is water, for example.

  As shown in FIG. 2, the cleaning step S100 includes a water washing step S110 and a drying step S120. The water washing step S110 includes a first water washing step S110a for washing the mask 1 with water (pretreatment), a second water washing step S110b for washing the mask 1 with water (main washing), and a third washing step (rinsing) for the mask 1 with water. The washing step S110c is included in this order.

  FIG. 4 is a drawing showing the cleaning device according to the present embodiment, and is a drawing showing the cleaning device 50 used in the cleaning step S100. In FIG. 4, illustration of the through hole 5 in the mask 1 is omitted for convenience.

  The cleaning device 50 includes a wheel conveyor (conveying means) 7, a pretreatment unit 10 in which the first water washing step S110a is performed, a cleaning unit 20 in which the second water washing step S110b is performed, and a third water washing step S110c. The post-processing part 30 to be performed and the drying part 40 in which the drying step S120 is performed are included. In the cleaning apparatus 50, the supply method of the mask 1 is, for example, a single wafer type, and the single mask 1 is sequentially conveyed. The mask 1 has the mask 1 in the order of the pre-processing unit 10, the cleaning unit 20, the post-processing unit 30, and the drying unit 40 by the wheel conveyor 7 with the upper surface 1a facing upward in the vertical direction and the lower surface 1b facing downward in the vertical direction. Is transported in a transport direction (horizontal direction) D2 orthogonal to the thickness direction (vertical direction) D1 (transport process). The supply method of the mask 1 may be a batch method in which a plurality of masks 1 are transported together and washed or dried at the same time. In the cleaning device 50, the mask 1 may be transported continuously by performing the transport operation, or the mask 1 may be transported intermittently by performing the transport operation intermittently.

  In the pre-processing unit 10, the cleaning unit 20, the post-processing unit 30, and the drying unit 40, the wheel conveyor 7 is on each of the upper surface 1a side and the lower surface 1b side of the mask 1 being conveyed so as to face each other in the thickness direction D1. Is arranged. In the pre-processing unit 10, the cleaning unit 20, the post-processing unit 30, and the drying unit 40, the mask 1 is sandwiched by the wheel conveyor 7 in the thickness direction D1 as shown in FIG. The mask 1 is transported in the transport direction D2 and cleaning liquid or drying air is supplied to the cleaning surface 3 of the mask 1.

  The wheel conveyor 7 in the pre-processing unit 10, the cleaning unit 20, the post-processing unit 30 and the drying unit 40 has a pair of wheels 7a and 7b arranged in the transport direction D2. The wheels 7 a and 7 b are, for example, roller-type wheels that are driven to rotate, and face each other in the thickness direction D <b> 1 in the pair of wheel conveyors 7. As shown in FIG. 5B, the pair of wheels 7a and 7b are arranged in a staggered pattern along the transport direction D2. For example, three pairs of wheels 7a and 7b are arranged in a direction (horizontal direction) D3 orthogonal to the thickness direction D1 and the conveyance direction D2, and four pairs of wheels 7a and 7b are arranged in the direction D3. The areas are alternately arranged along the transport direction D2.

  In the pre-processing unit 10, the cleaning unit 20, the post-processing unit 30, and the drying unit 40, it is preferable to transport the mask 1 so that the arrangement direction of the adjacent through holes 5 and the transport direction D2 coincide. Moreover, when the cross-sectional shape perpendicular | vertical to the axial direction of the through-hole 5 is a rectangle, it is preferable that the angle with respect to the conveyance direction D2 of at least one of the long-side direction or the short-side direction of the through-hole 5 is 45 degrees. In these cases, the inside of the through hole 5 can be washed and dried more satisfactorily.

  In a region other than the pretreatment unit 10, the cleaning unit 20, the posttreatment unit 30 and the drying unit 40 (a region before being transported to the pretreatment unit 10 and a region after being transported from the drying unit 40), the wheel conveyor 7 is It is arranged only below the mask 1 to be conveyed (see FIG. 4). The mask 1 is placed on the wheel conveyor 7 and conveyed in the conveyance direction D2 as the wheel rotates.

  In this embodiment, in the pre-processing unit 10, the cleaning unit 20, the post-processing unit 30, and the drying unit 40, the mask 1 is transported in the transport direction D2 while being held in the thickness direction D1 by the wheel conveyor 7. The cleaning liquid or the drying air is supplied to the cleaning surface 3 of 1. Thereby, it can suppress that the arrangement | positioning position of the mask 1 fluctuates because the mask 1 is pressed by the cleaning liquid or the drying air. Moreover, in this embodiment, although the mask 1 is conveyed in the state clamped in the thickness direction D1 by the wheel conveyor 7, a pair of wheel 7a, 7b which comprises the wheel conveyor 7 is the conveyance direction D2. Since they are arranged in a zigzag pattern, the area of the contact area between the mask 1 and the wheel conveyor 7 can be reduced as compared to the case of using a wheel conveyor having a long wheel extending in the direction D3. it can. Thereby, even if the foreign substance has adhered to the wheel conveyor 7, it can suppress that the said foreign substance will be supplied with respect to the wash | cleaned area | region in the cleaning surface 3 while conveying the mask 1. FIG. it can. According to the present embodiment as described above, it is easy to remove the foreign matter adhering to the mask 1, and the mask 1 can be more satisfactorily cleaned.

  In addition, the wheel conveyor 7 is not restricted above, In the pre-processing part 10, the washing | cleaning part 20, the post-processing part 30, and the drying part 40, you may arrange | position only under the mask 1 conveyed. Further, the wheel conveyor 7 includes a plurality of pairs of roller-type wheels opposed to the thickness direction D1 in the conveyance direction D2 in a region other than the preprocessing unit 10, the cleaning unit 20, the postprocessing unit 30, and the drying unit 40. The form which consists of may be sufficient. Furthermore, the wheel conveyor 7 is not limited to being arranged in a staggered manner along the transport direction D2, but is a form in which a plurality of long wheels extending in the direction D3 are arranged in parallel in the transport direction D2. May be.

(First water washing step S110a)
In 1st water washing process S110a, the mask 1 to which the foreign material adhered is conveyed to the pre-processing part 10, and pre-processing is performed to the mask 1 conveyed. As shown in FIG. 6, the pretreatment unit 10 includes a wheel conveyor 7 including a plurality of pairs of wheels 7 a and 7 b, a pair of roller brushes 12 a and 12 b, and a pair of spray nozzles 16 a that supply a cleaning liquid 14. 16b.

  A pair of roller brushes 12a and 12b are disposed so as to face each other in the thickness direction D1, the roller brush 12a is disposed on the upper surface 1a side of the mask 1, and the roller brush 12b is disposed on the lower surface 1b of the mask 1. Arranged on the side. The roller brushes 12a and 12b only need to be rotatable about an axis extending in a direction parallel to the cleaning surface 3 and intersecting the transport direction D2. In this embodiment, the roller brushes 12a and 12b are parallel to the cleaning surface 3 and perpendicular to the transport direction D2. It rotates about an axis extending in the same direction as the direction D3 in this embodiment. An axis A1 that is the rotation center of the roller brush 12a and an axis A2 that is the rotation center of the roller brush 12b extend in the direction D3 in parallel with each other. The roller brushes 12a and 12b only need to have a brush 12c capable of cleaning the mask 1, and are, for example, members having the brush 12c connected to the surface of a long wheel extending in the direction D3. The roller brushes 12a and 12b preferably rotate in the rotation direction D4 so that the brush 12c in contact with the mask 1 moves in the direction opposite to the conveyance direction D2. In this case, the mask 1 can be cleaned more satisfactorily.

  The spray nozzles 16a and 16b are opposed to each other in the thickness direction D1 with the roller brushes 12a and 12b interposed, and the centers of the upper surface 1a and the lower surface 1b pass between the spray nozzles 16a and 16b in the conveying process. Are arranged as follows. The spray nozzle 16a is arranged on the upper surface 1a side of the mask 1, and sprays the cleaning liquid 14 in the axial direction of the through-hole 5 (vertical direction, the same direction as the direction D1 in the present embodiment) to spray the cleaning liquid 14 on the upper surface 1a. Supply. The spray nozzle 16b is disposed on the lower surface 1b side of the mask 1, and sprays the cleaning liquid 14 in the axial direction of the through hole 5 to supply the cleaning liquid 14 to the lower surface 1b.

  The spray nozzles 16 a and 16 b only need to be able to supply the cleaning liquid 14 to the cleaning surface 3. For example, the spray nozzles 16 a and 16 b are one-fluid nozzles or two-fluid nozzles and are connected to a supply source 18 of the cleaning liquid 14. In the case where the spray nozzles 16a and 16b are two-fluid nozzles, the spray nozzles 16a and 16b are further connected to a compressed air supply source (not shown), and the mist composed of fine particles of the cleaning liquid 14 is removed. Can be sprayed. The distance from the tip (spray port) of the spray nozzle 16a to the upper surface 1a and the distance from the tip (spray port) of the spray nozzle 16b to the lower surface 1b are, for example, 50 to 200 mm. The temperature of the cleaning liquid 14 is, for example, 10 to 40 ° C.

  In the present embodiment, after the cleaning liquid 14 is sprayed on the roller brushes 12a and 12b from the spray nozzles 16a and 16b, the cleaning liquid 14 attached to the roller brushes 12a and 12b is caused by the rotation of the roller brushes 12a and 12b or the rollers. By flowing on the surfaces of the brushes 12a and 12b, the brush 12a is supplied between the cleaning surface 3 and the roller brushes 12a and 12b and used for cleaning the cleaning surface 3. In the present embodiment, the inner wall of the through hole 5 can be cleaned by supplying the cleaning liquid 14 supplied from the spray nozzles 16 a and 16 b to the cleaning surface 3 into the through hole 5.

  In the present embodiment, in the first water washing step S110a, the cleaning liquid 14 is supplied to the cleaning surface 3 of the mask 1 that is continuously or intermittently transported in the transport direction D2 by the wheel conveyor 7, and is parallel to the cleaning surface 3. Further, the cleaning surface 3 is cleaned by bringing the brushes 12c of the roller brushes 12a and 12b rotating around the axis extending in the direction D3 orthogonal to the transport direction D2 into contact with the cleaning surface 3 in order from the downstream side to the upstream side in the transport direction D2. To do. Thereby, in this embodiment, it becomes easy to remove the foreign material adhering to the cleaning surface 3, and the mask 1 can be cleaned more satisfactorily.

  In the present embodiment, in the first water washing step S110a, the cleaning surface 3 is cleaned by bringing the brush 12c into contact with each of the upper surface 1a and the lower surface 1b in a state where the cleaning liquid 14 is supplied to each of the upper surface 1a and the lower surface 1b. is doing. In this case, the mask 1 can be cleaned more satisfactorily.

  Note that the first water washing step S110a is not limited to the above, and the pretreatment unit 10 may include a plurality of roller brushes and spray nozzles arranged in the transport direction D2. Further, the pretreatment unit 10 may have a single roller brush or spray nozzle. For example, the spray nozzle is disposed only on either the upper surface 1a side or the lower surface 1b side, These roller brushes may be arranged between a single spray nozzle and the mask 1. The spray nozzles 16a and 16b may be opposed to each other in the thickness direction D1 without interposing the roller brushes 12a and 12b, and may be arranged apart from each other in the transport direction D2. The direction in which the cleaning liquid 14 is supplied from the spray nozzles 16a and 16b may be inclined with respect to the thickness direction D1.

(Second water washing step S110b)
In the second water washing step S110b, the mask 1 that has been pretreated in the first water washing step S110a is transported to the cleaning unit 20, and the mask 1 is finally cleaned. As shown in FIG. 7, the cleaning unit 20 includes a wheel conveyor 7 including a plurality of pairs of wheels 7 a and 7 b, and a pair of spray nozzles 26 a and 26 b that supply the cleaning liquid 24.

  The spray nozzle 26a is disposed on the upper surface 1a side of the mask 1, and is disposed such that the center of the upper surface 1a passes below the spray nozzle 26a in the transport process. The spray nozzle 26 a sprays the cleaning liquid 24 in the axial direction (vertical direction) of the through hole 5 and supplies the cleaning liquid 24 to the upper surface 1 a and the through hole 5. The spray nozzle 26b is disposed on the lower surface 1b side of the mask 1, and is disposed such that the center of the lower surface 1b passes above the spray nozzle 26b in the conveyance process. The spray nozzle 26 b sprays the cleaning liquid 24 in the axial direction of the through hole 5 and supplies the cleaning liquid 24 to the inside of the lower surface 1 b and the through hole 5.

  The spray nozzles 26a and 26b are disposed on the same straight line along the transport direction D2 and are separated from each other in the transport direction D2. The spray nozzle 26a is disposed downstream of the spray nozzle 26b in the transport direction D2. Yes. That is, the spray axis A3 of the cleaning liquid 24 sprayed on the upper surface 1a and the spray axis A4 of the cleaning liquid 24 sprayed on the lower surface 1b are separated from each other in the transport direction D2, and the spray axis A3 is It is located downstream of the spray axis A4 in the transport direction D2. Thereby, the supply position (area where the cleaning liquid 24 is sprayed) P1 on the upper surface 1a is located downstream of the supply position P2 of the cleaning liquid 24 on the lower surface 1b in the transport direction D2.

  The spray nozzles 26a and 26b are two-fluid nozzles capable of spraying the cleaning liquid 24 onto the cleaning surface 3, and are connected to a cleaning liquid supply source 28a and a compressed air supply source 28b. The distance from the tip (spray port) of the spray nozzle 26a to the upper surface 1a and the distance from the tip (spray port) of the spray nozzle 26b to the lower surface 1b are, for example, 10 to 200 mm. The spray spread angle θ1 of the spray nozzles 26a and 26b is, for example, 60 to 80 °. The spray pressure is, for example, 0.1 to 0.7 MPa. The spray amount is, for example, 0.2 to 4.0 liter / min. The temperature of the cleaning liquid 24 is, for example, 10 to 40 ° C. The spray pattern of the spray nozzles 26a and 26b is, for example, a film shape, a fan shape, or a cone shape, and a film shape is preferable from the viewpoint of obtaining a relatively uniform flow rate distribution. The distance D5 in the transport direction D2 between the tip of the spray nozzle 26a and the tip of the spray nozzle 26b prevents the cleaning liquid 24 from being simultaneously supplied into the same through-hole 5 from the upper surface 1a side and the lower surface 1b side. From the viewpoint of facilitating, it is, for example, 5 to 50 mm.

  In the second water washing step S110b, the spray nozzles 26a and 26b extend in the axial direction of the through-hole 5 with respect to the upper surface 1a and the lower surface 1b of the mask 1 that are continuously or intermittently conveyed in the conveyance direction D2 by the wheel conveyor 7, The cleaning liquid 24 is sprayed to clean the upper surface 1a and the lower surface 1b of the mask 1 and the inside of the through hole 5 in order from the downstream side to the upstream side in the transport direction D2.

  In the present embodiment, since the cleaning liquid 24 is sprayed from the spray nozzles 26a and 26b, which are two-fluid nozzles, in the second water washing step S110b, the mist composed of the fine particles of the cleaning liquid 24 is supplied to the cleaning surface 3. It is possible to easily remove foreign substances from the mask 1. Further, in the present embodiment, by spraying the cleaning liquid 24 in the axial direction of the through hole 5, the cleaning liquid 24 is easily supplied into the through hole 5, and the inside of the through hole 5 can be sufficiently cleaned. Furthermore, in this embodiment, the spray axis A3 of the cleaning liquid 24 sprayed on the upper surface 1a and the spray axis A4 of the cleaning liquid 24 sprayed on the lower surface 1b are separated from each other in the transport direction D2. In this case, in this embodiment, although the cleaning liquid 24 is sprayed on each of the upper surface 1a and the lower surface 1b, the cleaning liquid 24 is simultaneously supplied into the same through-hole 5 from each of the upper surface 1a side and the lower surface 1b side. Is suppressed. Thereby, the cleaning liquid 24 supplied from one side of the upper surface 1a side and the lower surface 1b side is prevented from being hindered by the cleaning liquid 24 supplied from the other side. According to the present embodiment as described above, the foreign matter adhering to the inner wall of the through hole 5 in addition to the foreign matter adhering to the cleaning surface 3 of the mask 1 can be sufficiently removed, and the mask 1 can be cleaned well. can do.

  In addition, the cleaning method according to the present embodiment includes a second water washing step S110b after the first water washing step S110a. In this case, since the mask 1 is finally cleaned in the second water washing step S110b after the mask 1 is washed as a pretreatment in the first water washing step S110a, the mask 1 can be further satisfactorily washed.

  In the present embodiment, in the second water washing step S110b, the mask 1 is transported with the upper surface 1a facing upward in the vertical direction and the lower surface 1b facing downward in the vertical direction, and the spray axis A3 is transported in the transport direction D2 rather than the spray axis A4. It is located on the downstream side. In this case, the cleaning liquid 24 supplied to the inside of the through-hole 5 by the spray nozzle 26b from the lower surface 1b side facing downward in the vertical direction passes through the inside of the through-hole 5 while removing foreign matters, and faces upward in the vertical direction. Even if it adheres to the upper surface 1a, the cleaning liquid 24 attached to the upper surface 1a can be removed by the cleaning liquid 24 supplied by the spray nozzle 26a on the downstream side in the transport direction D2. Thereby, the mask 1 can be more satisfactorily cleaned.

  The second water washing step S110b is not limited to the above, and the spray axis A3 is transported more than the spray axis A4 by disposing the spray nozzle 26a upstream of the spray nozzle 26b in the transport direction D2. It may be located upstream of D2. Further, the cleaning unit 20 may have a plurality of spray nozzles arranged in the transport direction D2.

(Third water washing step S110c)
In 3rd water washing process S110c, the mask 1 wash | cleaned by 2nd water washing process S110b is conveyed to the post-processing part 30, and a post-process is performed to the mask 1. FIG. As illustrated in FIG. 8, the post-processing unit 30 includes a wheel conveyor 7 including a plurality of pairs of wheels 7 a and 7 b and a pair of spray nozzles 36 a and 36 b that supply the cleaning liquid 34.

  The spray nozzles 36a and 36b are arranged in a pair so as to face each other in the thickness direction D1, and supply the cleaning liquid 34 in a direction D6 inclined to the upstream side of the transport direction D2 with respect to the thickness direction D1. The spray nozzle 36 a is disposed on the upper surface 1 a side of the mask 1 and sprays the cleaning liquid 34 to supply the cleaning liquid 34 to the upper surface 1 a and the inside of the through hole 5. The spray nozzle 36 b is disposed on the lower surface 1 b side of the mask 1 and sprays the cleaning liquid 34 to supply the cleaning liquid 34 to the inside of the lower surface 1 b and the through hole 5. The supply position (region where the cleaning liquid 34 is sprayed) P3 on the upper surface 1a and the supply position P4 of the cleaning liquid 34 on the lower surface 1b face each other in the thickness direction D1.

  The spray nozzles 36 a and 36 b are only required to be able to spray the cleaning liquid 34 onto the cleaning surface 3. For example, the spray nozzles 36 a and 36 b are one-fluid nozzles or two-fluid nozzles and are connected to a supply source 38 of the cleaning liquid 34. When the spray nozzles 36a and 36b are two-fluid nozzles, the spray nozzles 36a and 36b are further connected to a compressed air supply source (not shown).

  The inclination angle θ2 in the direction D6 for supplying the cleaning liquid 34 in the spray nozzles 36a and 36b is, for example, 10 to 45 ° with respect to the thickness direction D1. The shortest distance from the tip (spray port) of the spray nozzle 36a to the upper surface 1a and the shortest distance from the tip (spray port) of the spray nozzle 36b to the lower surface 1b are, for example, 50 to 200 mm. The spray pressure is, for example, 0.1 to 2 MPa. The spray amount is, for example, 0.2 to 15 liter / min. The temperature of the cleaning liquid 34 is, for example, 10 to 40 ° C. The spray pattern of the spray nozzles 36a and 36b is, for example, a film shape, a fan shape, or a cone shape.

  In the present embodiment, in the third water washing step S110c, the upstream side of the transport direction D2 with respect to the thickness direction D1 with respect to the cleaning surface 3 of the mask 1 that is transported continuously or intermittently by the wheel conveyor 7 in the transport direction D2. The cleaning liquid 34 is supplied in the direction D6 inclined to the side, and the mask 1 is cleaned in order from the downstream side to the upstream side in the transport direction D2. This makes it easier for foreign matter to be removed upstream of the transport direction D2 by the cleaning liquid 34, and suppresses foreign matter from remaining in the region of the cleaning surface 3 downstream of the transport direction D2 as the mask 1 is transported. Can do. Therefore, in this embodiment, it becomes easy to remove the foreign matter adhering to the mask 1, and the mask 1 can be cleaned more satisfactorily.

  In the present embodiment, the cleaning liquid 34 is supplied to each of the upper surface 1a and the lower surface 1b in the third water washing step S110c. In this case, the mask 1 can be cleaned more satisfactorily.

  Further, the cleaning method according to the present embodiment includes the second water washing step S110b before the third water washing step S110c. In this case, since the mask 1 is washed as a post-treatment in the third water washing step S110c after the main washing of the mask 1 in the second water washing step S110b, the mask 1 can be further satisfactorily washed.

  Note that the third water washing step S110c is not limited to the above, and the spray nozzles 36a and 36b are spaced apart from each other in the transport direction D2 so that the supply position P3 and the supply position P4 are in the transport direction D2. May be separated from each other. Further, the post-processing unit 30 may have a plurality of spray nozzles arranged in the transport direction D2, or may have a single spray nozzle only on one of the upper surface 1a side and the lower surface 1b side. Good.

(Drying step S120)
In the drying step S120, the mask 1 that has been post-processed in the third water washing step S110c and has the cleaning liquid attached thereto is conveyed to the drying unit 40, and the cleaning liquid attached to the mask 1 is removed. The cleaning liquid to be removed adheres to, for example, the upper surface 1 a and lower surface 1 b of the mask 1 and the inner wall of the through hole 5. As shown in FIG. 9, the drying unit 40 includes a wheel conveyor 7 including a plurality of pairs of wheels 7a and 7b, a spray nozzle 44 that blows dry air 42a as a first drying process, and a second drying process. Air knives 46a and 46b for blowing the drying air 42b are provided.

  The spray nozzle 44 and the air knives 46a and 46b are connected to a supply source 48 of the drying air 42a and the drying air 42b. The spray nozzle 44 blows the drying air 42 a for drying the mask 1 in the axial direction of the through hole 5, and can blow the drying air 42 a onto the cleaning surface 3. The air knives 46a and 46b blow the drying air 42b for drying the mask 1 in the direction D7 inclined to the upstream side of the transport direction D2 with respect to the thickness direction D1, and the drying air 42b over the entire length of the direction D3 in the mask 1. Can be sprayed onto the cleaning surface 3.

  The drying air 42a is preferably supplied to the mask 1 from only one of the upper surface 1a side and the lower surface 1b side. In this embodiment, the mask 1 is sprayed by the spray nozzle 44 only from the upper surface 1a side of the mask 1. Is supplied against. The spray nozzle 44 is disposed only on the upper surface 1a side, and is disposed such that the center of the upper surface 1a passes below the spray nozzle 44 in the transport process. The spray nozzle 44 blows the drying air 42 a and supplies the drying air 42 a to the upper surface 1 a and the inside of the through hole 5. The distance from the front-end | tip (blower surface) of the spray nozzle 44 to the upper surface 1a is 50-200 mm, for example. The pressure of the drying air 42a is, for example, 0.1 to 1 MPa. The supply amount of the drying air 42a is, for example, 100 to 1000 liters / min. The drying air 42a is, for example, a wind of 5 to 200 ° C. or warm air.

  The drying air 42b is supplied to the mask 1 by air knives 46a and 46b from the upper surface 1a side and the lower surface 1b side, respectively. The air knives 46a and 46b are arranged on the upper surface 1a side and the lower surface 1b side of the mask 1, respectively, and are paired so as to face each other in the thickness direction D1. The air knife 46a is disposed on the upper surface 1a side of the mask 1, and blows the drying air 42b to supply the drying air 42b to the upper surface 1a. The air knife 46b is disposed on the lower surface 1b side of the mask 1, and blows the drying air 42b to supply the drying air 42b to the lower surface 1b. The supply position P5 of the drying air 42b on the upper surface 1a (position where the drying air 42b is blown) P5 and the supply position P6 of the drying air 42b on the lower surface 1b face each other in the thickness direction D1.

  The shortest distance from the tip (air blowing surface) of the air knife 46a to the upper surface 1a and the shortest distance from the tip (air blowing surface) of the air knife 46b to the lower surface 1b are, for example, 1 to 200 mm. The pressure of the drying air 42b is, for example, 0.1 to 1 MPa. The supply amount of the drying air 42b is, for example, 100 to 5000 liters / min. The drying air 42b is, for example, a wind of 5 to 200 ° C. or warm air. The inclination angle θ3 in the direction D7 for supplying the drying air 42b in the air knives 46a and 46b is, for example, 10 to 45 ° with respect to the thickness direction D1.

  In the drying step S120, the drying air 42b is supplied to the region P7 to which the drying air 42a is supplied on the upper surface 1a. Specifically, the region P7 to which the drying air 42a blown from the spray nozzle 44 is supplied is conveyed in the conveying direction D2 as the mask 1 is conveyed in the conveying direction D2 continuously or intermittently by the wheel conveyor 7. Move downstream. The region P7 is supplied with the dry air 42b blown from the air knife 46a. In this way, the drying air 42a and the drying air 42b are supplied to the upper surface 1a while the mask 1 is being transported in the transporting direction D2, whereby the drying air 42a is applied to the upper surface 1a from the downstream side to the upstream side in the transporting direction D2. Then, the drying air 42b is supplied.

  In this embodiment, as a 1st drying process, with respect to the upper surface 1a of the mask 1 conveyed to the conveyance direction D2 continuously or intermittently by the wheel conveyor 7, in order toward the upstream from the downstream of the conveyance direction D2, By supplying the drying air 42 a from the spray nozzle 44 in the axial direction of the through hole 5, in addition to the cleaning liquid attached to the cleaning surface 3, the cleaning liquid attached to the inside of the through hole 5 can be removed.

  Subsequently, as the second drying step, the upper surface 1a and the lower surface 1b of the mask 1 that are continuously or intermittently transported in the transport direction D2 by the wheel conveyor 7 in order from the downstream side in the transport direction D2 toward the upstream side. By supplying the drying air 42b from the air knives 46a and 46b in the direction D7 inclined to the upstream side of the transport direction D2 with respect to the thickness direction D1, the cleaning liquid adhering to the upper surface 1a and the lower surface 1b can be removed.

  In the present embodiment, by performing the first drying process and the second drying process, it is possible to sufficiently remove the cleaning liquid attached to the cleaning surface 3 and the cleaning liquid attached to the inside of the through hole 5. Therefore, in this embodiment, the mask 1 can be cleaned more satisfactorily.

  In the present embodiment, the drying air 42a is supplied to the mask 1 only from the upper surface 1a side in the first drying step. In this case, the drying air 42a supplied from the upper surface 1a side of the through hole 5 is easily removed from the lower surface 1b side. Thereby, it becomes easy to remove the cleaning liquid adhering to the inside of the through-hole 5, and the mask 1 can be cleaned more satisfactorily.

  In the present embodiment, the drying air 42b is supplied from each of the upper surface 1a side and the lower surface 1b side in the second drying step. In this case, since the cleaning liquid adhering to the lower surface 1b can be removed together with the cleaning liquid adhering to the upper surface 1a, the mask 1 can be more satisfactorily cleaned.

  Note that the drying step S120 is not limited to the above. In the above embodiment, the mask 1 is transported in the horizontal direction, but the mask 1 may be transported in a direction inclined from the horizontal direction. For example, the mask 1 may be transported while being inclined such that the downstream side is positioned above the upstream side in the transport direction D2, and the tilt angle is, for example, 5 to 20 ° with respect to the horizontal direction. In this case, the cleaning liquid adhering to the mask 1 is further easily removed to the upstream side in the transport direction D2 by the drying air 42a and 42b, and the cleaning liquid remains in the downstream area of the cleaning surface 3 in the transport direction D2 or is dried. It is possible to prevent the cleaning liquid removed by the winds 42a and 42b from adhering again to the downstream area of the cleaning surface 3 in the transport direction D2. Further, in the drying step S120, a draft facility or a gas-liquid separator may be used from the viewpoint of further suppressing the cleaning liquid remaining in the downstream area of the cleaning surface 3 in the transport direction D2 and adhering again.

  Moreover, in the said embodiment, although the drying air 42b is supplied with respect to the area | region P7 to which the drying air 42a in the upper surface 1a was supplied, air knives 46a and 46b are arrange | positioned rather than the spray nozzle 44 in the upstream of the conveyance direction D2. And you may supply the drying air 42a with respect to the area | region where the drying air 42b in the upper surface 1a was supplied. Further, in the above embodiment, the drying air 42a and the drying air 42b are simultaneously supplied to the cleaning surface 3 of the same mask 1, but the drying air 42a is supplied over the entire length of the cleaning surface 3 in the transport direction D2. Later, the drying air 42b may be supplied over the entire length of the same cleaning surface 3 in the transport direction D2.

  The drying unit 40 may include a plurality of spray nozzles 44 and air knives 46a and 46b arranged in the transport direction D2. The drying unit 40 may have an air knife capable of blowing the drying air 42a over the entire length in the direction D3 in the mask 1 instead of the spray nozzle 44. Further, the spray nozzle 44 may be disposed only on the lower surface 1b side of the upper surface 1a side and the lower surface 1b side of the mask 1, and the drying air 42a may be supplied to the mask 1 only from the lower surface 1b side of the mask 1. .

  A pair of air knives 46a and 46b may be arranged apart from each other in the transport direction D2, and the supply position P5 and the supply position P6 may be separated from each other in the transport direction D2. In this case, since it is suppressed that the dry air 42b is simultaneously supplied into the same through-hole 5 from each of the upper surface 1a side and the lower surface 1b side, it is easier to remove the cleaning liquid adhering to the inside of the through-hole 5. Become. Alternatively, only one of the air knife 46 a and the air knife 46 b may be arranged, and the drying air 42 b may be supplied to the mask 1 from only one side of the mask 1.

<Preparation process S200>
A preparation step S200 subsequent to the cleaning step S100 will be described. In the preparation step S200, a honeycomb structure is prepared. For example, after extruding the raw material mixture to obtain a green honeycomb molded body having a plurality of through holes partitioned by partition walls, the green honeycomb molded body is fired to form a honeycomb structure (unsealed honeycomb fired body). obtain.

  The raw material mixture contains a ceramic material and an organic binder, and contains other additives as necessary. When the honeycomb filter 100 contains aluminum titanate, the raw material mixture contains, for example, an aluminum source powder or a titanium source powder as a ceramic material, and further contains a magnesium source powder or a silicon source powder as necessary. The organic binder is, for example, methyl cellulose. The additive is, for example, a pore-forming agent, a lubricant, a plasticizer, a dispersant, or a solvent.

<Sealing process S300>
In the sealing step S300, the mask 1 provided with the through holes 5 at positions corresponding to the through holes to be sealed in the honeycomb structure is brought into close contact with one end surface of the honeycomb structure, and the masks are formed in some of the through holes of the honeycomb structure. A sealing material is supplied through 1. Next, the mask 1 is brought into close contact with the other end surface of the honeycomb structure, and the sealing material is supplied through the mask 1 to the through hole in which the end portion on the one end surface side of the honeycomb structure is not sealed. As a result, a flow path is formed in which either the end on one end side or the end on the other end side of the honeycomb structure is sealed. In the present embodiment, as shown in FIG. 1, the flow path 110 a in which the end on the one end face 100 a side of the honeycomb filter 100 is sealed, and the flow path in which the end on the other end face 100 b side of the honeycomb filter 100 is sealed. The through-holes of the honeycomb structure are sealed so that 110b is alternately arranged. The sealing material is not particularly limited as long as the through-holes of the honeycomb structure can be sealed, and the same material as the raw material mixture for obtaining the honeycomb structure can be used.

  Subsequently, the honeycomb structure with the through holes sealed is heated, and the sealing material supplied into the through holes is cured to form the sealing portions 114. Thus, the honeycomb filter 100 shown in FIG. 1 can be obtained. In the above embodiment, the through hole is sealed in the sealing step S300 after firing the green honeycomb molded body in the preparation step S200, but after the through hole of the green honeycomb molded body obtained in the preparation step S200 is sealed. The honeycomb filter 100 can also be obtained by firing.

  DESCRIPTION OF SYMBOLS 1 ... Mask, 1a ... Upper surface (one main surface), 1b ... Lower surface (the other main surface), 5 ... Through-hole, 7 ... Wheel conveyor (conveyance means), 24 ... Cleaning liquid, 26a, 26b ... Spray nozzle (2 Fluid nozzle), 50 ... cleaning device, 100 ... honeycomb filter, A3, A4 ... spray axis, D1 ... mask thickness direction, D2 ... mask transport direction, S100 ... cleaning step, S110b ... second water washing step, S300 ... Sealing process.

Claims (4)

A cleaning method for a honeycomb structure sealing mask having a plurality of through holes penetrating in a thickness direction from one main surface to the other main surface,
Transporting the mask in a direction perpendicular to the thickness direction;
Spraying the cleaning liquid in the axial direction of the through hole from a two-fluid nozzle on each of the one main surface and the other main surface of the transported mask, and
A cleaning method in which a spray axis of the cleaning liquid sprayed on the one main surface and a spray axis of the cleaning liquid sprayed on the other main surface are separated from each other in the transport direction of the mask. .   The mask is transported with the one main surface facing upward and the other main surface facing downward, and the spray axis of the cleaning liquid sprayed on the one main surface is the other main surface. The cleaning method according to claim 1, wherein the cleaning method is located downstream of the spray axis of the cleaning liquid sprayed on the main surface in the transport direction. Cleaning the mask by the cleaning method according to claim 1 or 2,
Supplying a sealing material to a part of the through-holes of the honeycomb structure through the washed mask. A cleaning device for a honeycomb structure sealing mask having a plurality of through holes penetrating in a thickness direction from one main surface to the other main surface,
Transport means for transporting the mask in a direction perpendicular to the thickness direction;
A two-fluid nozzle that sprays a cleaning liquid in the axial direction of the through-hole with respect to each of the one main surface and the other main surface of the transported mask,
A cleaning apparatus in which a spray axis of the cleaning liquid sprayed on the one main surface and a spray axis of the cleaning liquid sprayed on the other main surface are separated from each other in the transport direction of the mask .

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