JP2006182569A - Sagger for firing ceramics, and calcination furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sagger for firing ceramics capable of effectively utilizing the atmospheric gas for firing while improving the stacking efficiency of a ring-like ceramic formed body. <P>SOLUTION: The sagger 1 for firing ring-like ceramics is provided with a pair of support plates 10 for supporting a plurality of rods 22 for disposing the ring-like ceramic formed bodies. The support plates 10 each have a plurality of holes 101 formed so as to be inserted with the rods 22 at the positions corresponding to each other, and are held so that the plurality of holes 101 formed thereon face each other. The holes 101 are disposed along the first and second directions crossing with each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ceramic firing sheath for firing a ring-shaped ceramic molded body, and a firing furnace using the ceramic firing sheath.

Conventionally, as a ceramic firing sheath for firing a ring-shaped ceramic molded body, a plate-shaped one provided with a plurality of grooves for supporting a rod on which the ring-shaped ceramic molded body is arranged is known (for example, See Patent Document 1 below). In the case of firing a ring-shaped ceramic molded body using a sheath for ceramic firing described in Patent Document 1 below, first, a rod in which the ring-shaped ceramic molded body is skewered is prepared. Subsequently, the skewered bar is placed in the groove, and then the bar is removed, leaving only the ring-shaped ceramic molded body in the groove between the grooves. Thereafter, a plurality of ceramic firing sheaths in which only the ring-shaped ceramic molded body is arranged are stacked and fired.
JP-A-8-128789

  In the above-described conventional ceramic firing sheath, the ceramic firing sheaths are stacked and fired after the ceramic compacts are arranged. Also, since it is convenient for manufacturing and management of the ceramic firing sheaths to have the same shape for each ceramic firing sheath, each ceramic firing sheath is placed in the same position in the horizontal direction one step at a time. It becomes the form to arrange. When viewed from the direction in which the arranged ceramic molded bodies are aligned, the ratio of the projected area of the ceramic molded body to the projected area of the ceramic firing sheath is not necessarily high. Therefore, the ratio of the volume of the ceramic molded body that can be disposed to the volume occupied by the sheath for ceramic firing is not necessarily high.

  In the above-mentioned ceramic firing sheath, the atmosphere gas (gas constituting the firing atmosphere) is introduced into the ceramic firing sheath from the direction in which the arranged ceramic compacts are aligned. The above-described conventional ceramic firing sheath is provided with a bank around the ring so that the ring-shaped ceramic molded body does not fall off from the ceramic firing sheath after the rod is removed. Therefore, the atmosphere gas introduced into the firing furnace in which the ceramic firing sheath is conveyed may not be smoothly introduced into the ceramic firing sheath, and the atmosphere gas may be discharged without being fully utilized.

  Moreover, in the above-mentioned ceramic firing sheath, since it is necessary to form a groove in which the ceramic molded body is arranged, there are many components as a structure and it is heavy. Therefore, the heat capacity of the sheath for ceramic firing is increased, and the amount of atmospheric gas required for increasing the temperature of the ceramic molded body is increased.

  Therefore, an object of the present invention is to provide a ceramic firing sheath and a firing furnace that can effectively use the atmosphere gas for firing while increasing the loading efficiency of the ring-shaped ceramic molded body.

  The ceramic firing sheath of the present invention is a ceramic firing sheath for firing a ring-shaped ceramic molded body, and includes a pair of support plates for supporting a plurality of rods on which the ring-shaped ceramic molded body is arranged, Each of the pair of support plates is formed with a plurality of holes into which a plurality of bars can be inserted at positions corresponding to each other, and the pair of support plates are opposed to each other so that the plurality of holes formed in each face each other. It is hold | maintained and the some hole is arrange | positioned along each of the 1st direction and 2nd direction which mutually cross | intersect.

  According to the present invention, since the plurality of holes formed in the pair of support plates are arranged along the first direction and the second direction intersecting each other, the support plate is effectively used. Can support the rod. Since the ring-shaped ceramic molded body is arranged on a rod and the rod is held by a pair of support plates, when the ceramic firing sheath is exposed to an atmospheric gas, the atmospheric gas is spread over the ring-shaped ceramic molded body. It becomes easy.

  Further, in the case of the ceramic firing sheath of the present invention, when the ring-shaped ceramic molded body is disposed on each of the plurality of rods and the plurality of disposed rods are supported by a pair of support plates, the ceramic firing sheath is disposed on the one supported rod. It is also preferable that the positions of the holes in each of the pair of support plates are determined so that the formed ring-shaped ceramic molded body does not come into contact with the ring-shaped ceramic molded body disposed on the other supported rod. Since it can hold | maintain so that the ring-shaped ceramic molded objects arrange | positioned on a different stick | rod may not contact, atmospheric gas can be made to contact each ring-shaped ceramic molded object effectively.

  Moreover, in the ceramic firing sheath of the present invention, the support plate is preferably formed of a material having a through hole penetrating from its main surface to a surface facing the main surface. Since the through hole is formed in the support plate, it is easy to introduce the atmospheric gas into the ring-shaped ceramic molded body from the support plate side even when the rod is held by the support plate.

  In the sheath for ceramic firing of the present invention, the support plate is preferably a circular plate. When the support plate is a circular plate, the shape is similar to that of the ring-shaped ceramic molded body, so that the loading efficiency can be further increased.

  In the ceramic firing sheath of the present invention, it is also possible to provide a cylindrical outer cylinder part along the circumferential part of each of the pair of support plates, and hold the circumferential part of each of the pair of support plates by the outer cylinder part. preferable. Since the circumferential portion of each of the pair of support plates is held by the outer cylinder portion, a cylindrical sheath can be formed by the pair of support plates and the outer cylinder portion, and a rod with a ring-shaped ceramic molded body is accommodated in the cylinder it can.

  In the ceramic firing sheath of the present invention, it is also preferable to provide at least three support bars for holding the pair of support plates at a predetermined interval. Since the pair of support plates are held by the three support rods, the pair of support plates can be accurately held at a predetermined interval.

  Further, in the ceramic firing sheath of the present invention, the support bar penetrates the support plate, and a locking member is provided so as to sandwich the support bar between the main surface of the support plate and the surface facing the main surface. It is also preferable. Since the support rod penetrating the support plate is fixed by the locking member so as to be sandwiched with the support plate, the support plate and the support rod can be more reliably fixed.

  The firing furnace of the present invention includes the above-described ceramic firing sheath, a tubular passage formed so that the ceramic firing sheath can be inserted, and a heater disposed around the tubular passage.

  According to the present invention, a tubular path into which a ceramic firing sheath with good loading efficiency can be inserted is provided, and the inside of the tubular path is raised to a predetermined temperature by a heater arranged outside the tubular path. The atmospheric gas can be used effectively while increasing.

  In the firing furnace of the present invention, it is also preferable to include a rotating means for rotating the ceramic firing sheath around its axis. Since the ceramic firing sheath is rotated, the ring-shaped ceramic molded body disposed in the ceramic firing sheath can be fired without spots.

  In the firing furnace of the present invention, it is also preferable to provide a gas introduction means for introducing an atmosphere gas constituting an atmosphere for firing the ceramic molded body into the tubular passage. Since the atmospheric gas can be introduced into the tubular passage, the atmospheric gas can be effectively applied to the sheath for firing the ceramic in the tubular passage.

  Moreover, in the baking furnace of this invention, it is also preferable to provide the substitution chamber connected with each of the one end and multiple ends of a tubular channel. Since the replacement chamber connected to both ends of the tubular passage is provided, the ceramic firing sheath can be put into the tubular passage without affecting the furnace temperature and the furnace atmosphere in the tubular passage as much as possible.

  In the firing furnace of the present invention, it is also preferable to provide an extrusion means for advancing the ceramic firing sheath in the tubular path. Since the ceramic firing sheath can be advanced in the tubular passage, the ceramic firing sheath can be sequentially fed into the tubular passage.

  ADVANTAGE OF THE INVENTION According to this invention, the rod which arrange | positioned the ring-shaped ceramic molded object can be supported effectively using the support plate of a ceramic baking sheath. In addition, the atmospheric gas can be effectively spread over the ring-shaped ceramic molded body. Accordingly, it is possible to provide a ceramic firing sheath that can effectively use the atmosphere gas for firing while increasing the loading efficiency of the ring-shaped ceramic molded body.

  The teachings of the present invention can be readily understood by considering the following detailed description with reference to the accompanying drawings shown for illustration only. Subsequently, embodiments of the present invention will be described with reference to the accompanying drawings. Where possible, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  The sheath for ceramic firing which is an embodiment of the present invention will be described with reference to FIG. FIG. 1A is a perspective view showing the structure of a sheath 1 for ceramic firing. FIG. 1B is a perspective view showing a state in which a rod 22 in which a ring-shaped ceramic molded body 21 is arranged on a sheath 1 for ceramic firing is accommodated.

  The ceramic firing sheath 1 includes a pair of support plates 10 and three support rods 12. The support plate 10 is a circular plate and is held by three support rods 12 so as to maintain a predetermined interval. A hole 101 and a hole 102 are respectively formed in the support plate 10. The hole 101 is a hole for inserting the rod 22 provided with the ceramic molded body 21. The hole 102 is a hole for inserting the support rod 12.

  The holes 101 and 102 will be described in more detail with reference to FIG. (A) of FIG. 2 is the figure which looked at the sheath 1 for ceramic baking from the arrow A direction in (b) of FIG. FIG. 2B is an enlarged view of a part of the support plate 10 of the ceramic firing sheath 1.

  As shown in FIG. 2A, the hole 101 is arranged along three concentric circles 10a, 10b, and 10c with the center of gravity of the support plate 10 as a reference. The diameter of the hole 101 is formed to be larger than the diameter of the rod 22. Therefore, the rod 22 inserted into the hole 101 is located below the hole 101. The inner diameter of the ring-shaped ceramic molded body 21 arranged on the rod 22 is larger than the diameter of the rod 22. Therefore, the position of the ceramic molded body 21 with respect to the hole 101 is shifted downward as shown in FIG.

  As shown in FIG. 2A, the positions of the holes 101 are such that when the rod 22 provided with the ceramic molded body 21 is inserted, the ceramic molded body 21 arranged on one rod 22 is connected to the other rod 22. It is determined so as not to come into contact with the ceramic molded body 21 disposed on the surface. Further, since the hole 101 is arranged along the three concentric circles 10a, 10b, and 10c as described above, when viewed from the center of gravity of the support plate 10, a plurality of substantially radial directions (first direction, second direction) (Direction).

  The hole 102 is formed so as to be adjacent to the hole 101 on the concentric circle 10 c where the hole 101 is disposed. The diameter of the hole 102 is slightly larger than the diameter of the support bar 12, and the support bar 12 is inserted into the hole 102.

  The support plate 10 is formed of a porous material having a plurality of through holes penetrating from the main surface to the opposing surface. Therefore, as shown in FIG. 2B, a plurality of through holes 103 are provided in addition to the hole 101 (hole 102). Therefore, when the ceramic firing sheath 1 is exposed to the atmospheric gas, the atmospheric gas passes through the through-hole 103 and fires the ceramic molded body 21 disposed inside.

  Next, the manner of fixing the support plate 10 and the support rod 12 will be described with reference to FIG. 3A is a diagram showing an example of a fixing mode between the support plate 10 and the support rod 12, and FIG. 3B is a diagram showing another example of a fixing mode between the support plate 10 and the support rod 12. It is.

  According to the example shown in FIG. 3A, two holes 121 are formed in the support rod 12 penetrating the support plate 10. One of the holes 121 is formed at a position along the main surface 104 of the support plate 10, and one of the holes 121 is formed at a position along the surface 105 facing the main surface 104. A pin 23 (locking member) is inserted into each of the two holes 121.

  The pin 23 includes a cylindrical portion 23 a that is longer than the diameter of the support rod 12 and a head portion 23 b that is larger than the diameter of the hole 121. Accordingly, the pin 23 inserted into the hole 121 protrudes from the support rod 12 at the head 23 b and the tip of the cylindrical portion 23 a. Since the hole 121 into which the pin 23 is inserted is formed at a position sandwiching the support plate 10, the support plate 10 can be sandwiched and fixed by inserting the pin 23 into the hole 121.

  According to the example shown in FIG. 3B, a groove 122 is formed in the support rod 12 penetrating the support plate 10. A pair of grooves 122 is formed in the diameter direction of the support rod 12. Further, the pair of grooves 122 is formed at each of a position along the main surface 104 of the support plate 10 and a position along the surface 105 facing the main surface 104. A clip 24 is inserted into each groove 122.

  A pair of legs 24 a is formed so that the clip 24 is inserted into each of the pair of grooves 122. Further, when the clip 24 is inserted into the groove 122, the outer periphery of the clip 24 is formed so as to protrude outward from the outer periphery of the support rod 12. Therefore, the support plate 10 can be sandwiched and fixed by inserting the clip 24 into the groove 122.

  Next, a modification of the ceramic firing sheath 1 will be described with reference to FIG. FIG. 4 is a perspective view showing the structure of a ceramic firing sheath 2 as a modification. The ceramic firing sheath 2 includes a pair of support plates 15 and an outer cylinder portion 14. The support plate 15 is a circular plate member similar to the ceramic support sheath 10 already described. In the support plate 15, only the hole 101 for inserting the rod 22 provided with the ceramic molded body 21 is formed, and the hole 102 for inserting the support rod 12 is not formed.

  The outer cylinder portion 14 is formed so as to form a cylindrical shape along the circumferential portions of the pair of support plates 15. Support plates 15 are inserted into one end and the other end of the outer cylinder portion 14, respectively. Therefore, the outer cylinder portion 14 holds the support plate 15 at a predetermined interval by holding the circumferential portion of the support plate 15.

  Next, a firing furnace using the ceramic firing sheath 1 (2) of this embodiment will be described with reference to FIG. FIG. 5 is a view for explaining the configuration of the firing furnace 5, and is a view schematically showing the cross-sectional shape of the firing furnace 5. The firing furnace 5 includes a furnace body 51, a tubular passage 52, a heater 53, and a replacement chamber 54.

  The tubular passage 52 is disposed in the furnace space 51 a in the furnace body 51. The tubular passage 52 is connected from one end to the other end of the furnace body 51 to form a series of tubular passages. The heater 53 is disposed in the furnace space 51 a outside the tubular passage 52, and surrounds the tubular passage 52.

  A replacement chamber 54 is disposed at one end and the other end of the tubular passage 52. The configuration of the replacement chamber 54 will be described with reference to FIG. 6A and 6B are diagrams for explaining the behavior of the ceramic firing sheath 1 (2) in the replacement chamber 54. FIG. As shown in FIG. 6A, when a new ceramic firing sheath 1 (2) is introduced into the tubular passage 52, the pusher 55 (extrusion means) is retracted.

  Next, the inlet 52 a formed at the portion where the tubular passage 52 faces the replacement chamber 54 is opened, and the ceramic firing sheath 1 (2) is introduced from the replacement chamber 54 to the tubular passage 52. When the ceramic firing sheath 1 (2) is introduced from the replacement chamber 54, the inlet 52a of the tubular passage 52 is closed. In a series of processes in which the ceramic firing sheath 1 (2) in the replacement chamber 54 is introduced into the tubular passage 52, the inlet 54a of the replacement chamber 54 is closed.

  Next, the pusher 55 is advanced into the tubular passage 52, and the newly introduced sheath 1 for ceramic firing advances through the tubular passage 52 ((b) of FIG. 6). As shown in FIG. 6 (b), while the ceramic firing sheath 1 (2) is advanced into the tubular passage 52 by the pusher 55, the inlet 54a of the replacement chamber 54 is opened and the next ceramic firing sheath is opened. Prepare 1 (2). By repeating the above-described procedure, the ceramic molded body held continuously by the sheath for firing ceramic 1 (2) in the firing furnace 5 can be fired.

  Subsequently, another example of the firing furnace using the ceramic firing sheath 1 (2) of the present embodiment will be described with reference to FIG. FIGS. 7A and 7B are views for explaining the configuration of the firing furnace 7 and schematically showing the cross-sectional shape of the firing furnace 7. More specifically, FIG. 7A shows a cross section in the direction crossing the axis of the tubular path 72 of the firing furnace 7, and FIG. 7B shows a cross section in the direction along the axis of the tubular path 72. ing. The firing furnace 7 includes a furnace body 71, a tubular path 72, and a heater 73.

  The tubular path 72 is disposed in a furnace space 71 a in the furnace body 71. The tubular passages 72 are arranged in three rows of three each so as to penetrate the other wall from one wall of the furnace body 51. The heater 73 is disposed in the in-furnace space 71 a outside the tubular passage 72 and enters between the tubular passages 72.

  A gas introduction path 74 (gas introduction means) is connected to one end of each of the nine tubular paths 72, and a gas discharge path 75 is connected to the other end. The ceramic molded body held by the ceramic firing sheath 1 (2) inserted into the tubular passage 72 is fired by the atmospheric gas introduced from the gas introduction passage 74. The atmospheric gas obtained by firing the ceramic molded body is discharged from the gas discharge path 75.

  As shown in FIG. 7, the gas introduction path 74 includes an introduction pipe 74a and a lid 74b. The lid 74 b is a lid for sealing the tubular path 72 after inserting the ceramic firing sheath 1 (2) into the tubular path 72. The introduction pipe 74a is connected to the lid 74b, and is configured to be able to introduce atmospheric gas into the tubular path 72 when the lid 74b is attached to the tubular path 72.

  The tubular path 72 is configured to be rotatable about its axis. A configuration for rotating the tubular path 72 will be described with reference to FIG. 9A shows a cross-sectional configuration in a direction intersecting the axis of the tubular path 72, and FIG. 9B shows a cross-sectional configuration in a direction along the axis of the tubular path 72.

  A pair of rollers 76 are provided along the tubular path 72. Each of the rollers 76 is in contact with the tubular path 72, and when each roller 76 rotates in the same direction, the tubular path 72 rotates in the opposite direction.

  Each roller 76 is supported by bearings 77 in the vicinity of both ends. A sprocket 78 is fixed to one end of each roller 76. A chain 79 is hung on the sprocket 78, and when the chain 79 is rotated by rotation of a motor (not shown), the sprocket 78 is rotated. When the sprocket 78 rotates, the roller 76 also rotates, so that the tubular path 72 can be rotated. Accordingly, the roller 76, the bearing 77, the sprocket 78, and the chain 79 shown in FIGS. 9A and 9B constitute rotating means.

  As described above, according to the ceramic firing sheath 1 (2) of the present embodiment, the plurality of holes 101 formed in the pair of support plates 10 are arranged along different concentric circles. The support plate 10 can be used more effectively to support the rod 22. Since the ring-shaped ceramic molded body 21 is disposed on the rod 22 and the rod 22 is held by the pair of support plates 10, when the ceramic firing sheath 1 is exposed to the atmospheric gas, The atmosphere gas becomes easy to spread.

  Moreover, in the ceramic firing sheath 1 (2), since the ceramic molded bodies 21 arranged on the different rods 22 can be held so as not to contact each other, the atmosphere gas can be effectively brought into contact with each ceramic molded body 21.

  Moreover, in the ceramic firing sheath 1 (2), since the through hole 103 is formed in the support plate 10, the atmosphere gas is supplied from the support plate 10 side to the ceramic molded body 21 even when the rod 22 is held by the support plate 10. Easy to introduce.

  In addition, in the ceramic firing sheath 1 (2), since the support plate 10 is a circular plate, the shape is similar to the ring-shaped ceramic molded body 21, and the loading efficiency can be further increased.

  Further, in the ceramic firing sheath 1, since the pair of support plates 10 are held by the three support rods 12, the pair of support plates 10 can be accurately held at a predetermined interval.

  Further, in the ceramic firing sheath 1, since the support rod 12 penetrating the support plate 10 is fixed by the pin 23 and the clip 24 so as to be sandwiched together with the support plate 10, the support plate 10 and the support rod 12 are more reliably connected. Can be fixed.

  Further, in the ceramic firing sheath 2 which is a modified example, since the circumferential portion of each of the pair of support plates 10 is held by the outer cylinder portion 14, a cylindrical sheath is formed by the pair of support plates 10 and the outer cylinder portion 14. It is possible to accommodate the rod 22 provided with the ceramic molded body 21 in the cylinder.

  According to the firing furnace 5 (7) of this embodiment, the ceramic firing sheath 1 (2) with high loading efficiency is provided with the tubular passage 52 (72) that can be inserted, and is disposed outside the tubular passage 52 (72). Since the inside of the tubular passage 52 (72) is raised to a predetermined temperature by the heater 53 (73), the atmospheric gas can be used effectively while increasing the loading efficiency.

  Also, in the firing furnace 5 (7), the ceramic firing sheath 1 (2) is rotated by the rotating means (roller 76, bearing 77, sprocket 78, and chain 79). The arranged ceramic molded body 21 can be fired without spots.

  In the firing furnace 7, the tubular passage 72 is provided with a gas introduction passage 74 for introducing an atmosphere gas constituting an atmosphere for firing the ceramic molded body, and the atmosphere gas can be introduced into the tubular passage 72. Therefore, the atmospheric gas can be effectively applied to the sheath for firing ceramic in the tubular path 72.

  In addition, since the firing furnace 5 includes the replacement chambers 54 connected to both ends of the tubular passage 52, ceramic firing is performed in the tubular passage 52 without affecting the furnace temperature and the furnace atmosphere in the tubular passage 52 as much as possible. Use sheath 1 (2) can be inserted.

  Further, the firing furnace 5 is preferably provided with a pusher 55 for advancing the ceramic firing sheath 1 (2) in the tubular passage 52. Since the ceramic firing sheath 1 (2) can be advanced in the tubular passage 52, the ceramic firing sheath 1 (2) can be sequentially fed into the tubular passage 52.

It is a perspective view which shows the structure of the sheath for ceramic baking which is embodiment of this invention. It is a figure for demonstrating the support plate of FIG. It is a figure for demonstrating the attachment part of the support plate and support bar of FIG. It is a figure which shows the modification of FIG. It is a figure which shows the structure of the baking furnace which is embodiment of this invention. It is a figure for demonstrating the replacement chamber of FIG. It is a figure which shows the structure of the baking furnace which is embodiment of this invention. It is a figure which shows the structure of the gas introduction path of FIG. It is a figure which shows the structure which rotates the tubular path of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Ceramic firing sheath 10 ... Support plate, 12 ... Support rod, 101 ... Hole, 102 ... Hole, 21 ... Ceramic compact, 22 ... Bar

Claims (12)

A ceramic firing sheath for firing a ring-shaped ceramic molded body, comprising a pair of support plates for supporting a plurality of rods on which the ring-shaped ceramic molded body is disposed,
Each of the pair of support plates is formed with a plurality of holes into which the plurality of bars can be inserted at positions corresponding to each other,
The pair of support plates are held facing each other so that a plurality of holes formed in each of the pair of support plates face each other.
The plurality of holes are arranged along a first direction and a second direction intersecting each other,
A ceramic firing pod characterized by that. When the ring-shaped ceramic molded body is arranged on each of the plurality of rods, and the plurality of arranged rods are supported by the pair of support plates,
The position of the hole in each of the pair of support plates so that the ring-shaped ceramic molded body disposed on the supported one rod does not contact the ring-shaped ceramic molded body disposed on the other supported rod. The sheath for ceramic firing according to claim 1, wherein the sheath is determined. 3. The ceramic firing sheath according to claim 1, wherein the support plate is formed of a material having a through hole penetrating from a main surface thereof to a surface opposed to the main surface. 4. The sheath for ceramic firing according to any one of claims 1 to 3, wherein the support plate is a circular plate. 5. A cylindrical outer cylinder portion is provided along the circumferential portion of each of the pair of support plates, and the circumferential portion of each of the pair of support plates is held by the outer cylinder portion. The sheath for ceramic firing described. 5. The ceramic firing sheath according to claim 1, comprising at least three support rods for holding the pair of support plates at predetermined intervals. The support bar penetrates the support plate, and a locking member is provided so as to sandwich the support bar between a main surface of the support plate and a surface facing the main surface. The sheath for ceramic firing according to claim 6. The sheath for ceramic firing according to any one of claims 1 to 7, a tubular passage formed so that the sheath for firing ceramic can be inserted, and a heater disposed around the tubular passage; A firing furnace. The firing furnace according to claim 8, further comprising a rotating means for rotating the ceramic firing sheath about its axis. The firing furnace according to claim 8 or 9, further comprising gas introduction means for introducing an atmosphere gas constituting an atmosphere for firing the ceramic compact into the tubular path. The firing furnace according to any one of claims 8 to 10, further comprising a replacement chamber connected to each of one end and multiple ends of the tubular passage. The firing furnace according to any one of claims 8 to 11, further comprising extrusion means for advancing the sheath for firing the ceramic in the tubular path.

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