JP2006272443A - Production method for corrugated sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To narrow pitches to a desired corrugated sheet shape without deforming the corrugated sheet with slit holes in the portions of the slit holes. <P>SOLUTION: A corrugated sheet material 10 having perforated sections 12 in which the plurality of rows of slit holes 20 are formed and holeless sections 22 in which the slit holes 20 are not formed is charged from the holeless sections 22 side of the corrugated sheet material 10 into the corrugated sheet production apparatus 100 equipped with a molding roll section 11, a pitch narrowing roll section 12 and a shape profiling roll section 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for producing a metal carrier used in a catalytic converter that purifies exhaust gas.

  An exhaust system such as an internal combustion engine is equipped with a catalytic converter for purifying exhaust gas. As a catalyst carrier used in such a catalytic converter, a metal carrier made of a thin metal plate such as Fe-Cr-Al ferrite stainless steel foil material is widely used.

  This type of metal carrier is composed of a core having a substantially circular cross section by alternately winding a corrugated plate and a flat plate made of a thin metal plate, and a metal outer tube on which the core is mounted, By passing the exhaust gas through a plurality of cell passages formed between the corrugated plate and the flat plate, harmful components contained in the exhaust gas are removed by the catalytic reaction of the catalyst layer formed on the core surface. It is a thing.

  Conventionally, for the purpose of improving the exhaust purification performance of the metal carrier, a plurality of slit holes are formed on the surface of the corrugated plate to generate turbulent flow when the exhaust gas passes through the metal carrier. Those in which the catalyst layer is more in contact are known (see Patent Document 1 and Patent Document 2).

Moreover, as a corrugated sheet manufacturing apparatus, fin material formed into corrugated plates by a corrugating machine is continuously processed in the order of a pitch filling machine, an intermediate filling machine, and a pitching machine, thereby adjusting the fin pitch. What was adjusted is known (refer patent document 3).
JP 2002-143893 A JP 2004-188328 A JP 11-147149 A

  In the manufacturing method disclosed in the above Japanese Patent Application Laid-Open No. 11-147149, pitch filling is performed by meshing the pitch filling roll and the fin top, so that the pitch cannot be packed until the fin tops are in contact with each other. With a material having a large repulsive force, the crest returns after molding, and it has been difficult to mold the fin into a desired corrugated shape.

  On the other hand, the applicant of the present application is a corrugated fin manufacturing apparatus in which pitch filling is performed by press-contacting the tops of the fins between the forming roll and the pitch filling roll by using the fin discharge force of the forming roll. (Japanese Patent Application No. 2004-042598). In the corrugated fin manufacturing apparatus described above, fin guides are provided between the forming roll and the pitch filling roll, and between the pitch filling roll and the shaping roll, respectively, for preventing the skew of the fins. In this fin guide, a plurality of jumping plates for separating the fins from the forming teeth of each roll are arranged along the width direction of the fins. And the front-end | tip of this jumping board is formed in a wedge shape, and it is comprised so that it may engage with the groove part formed in each roll.

  And in this corrugated fin manufacturing apparatus, since the corrugated plate is pitch packed until the corrugated plate tops are pressed against each other using the corrugated sheet discharging force of the forming roll in the pitch filling roll that is a secondary forming step, Even when a material having a large repulsive force such as a material is used, the crest does not return after molding, and the corrugated plate shape can be made uniform.

  In this way, in the corrugated sheet material without a normal slit hole, a force is applied evenly to the rigid member, and the ridge line direction of the corrugated sheet material that is pitch-packed is parallel to the groove shape of the pitch-packed roll, so that they are aligned. Pitch filling can be performed in the state. However, in the case of a corrugated sheet having slit holes (hereinafter referred to as corrugated sheet with slit holes), the corrugated sheet material itself has low rigidity, so that it interferes with the fin guide near the exit of the forming roll, and the vicinity of the slit hole is the center. The phenomenon of bending or stretching occurs, and it is difficult to pack the pitch with the corrugated sheet aligned with the pitch packing roll.

  An object of the present invention is to provide a corrugated sheet manufacturing method capable of pitch-packing corrugated sheets with slit holes into a desired corrugated sheet shape.

  In order to solve the above-mentioned problems, the invention according to claim 1 includes a forming roll pair for forming a strip-like corrugated sheet material having a plurality of rows of slit holes along the forming direction into a first corrugated shape, and the forming roll pair. The corrugated plate tops of the corrugated sheet material discharged from the pressure plate are pressed together to form a second corrugated shape, and the corrugated plate top portions of the corrugated sheet material are separated from each other so that the corrugated plate pitch is higher than that of the second corrugated shape. A pair of pitch stuffing rolls having a wide third corrugated shape, and a corrugated plate top of the third corrugated shape of the corrugated sheet material discharged from the pair of pitch stuffing rolls is expanded to make the corrugated sheet material a target corrugated shape. A corrugated sheet manufacturing method using a corrugated sheet manufacturing apparatus, comprising a pair of shape forming rolls to be formed into a shape, and a fin guide disposed between the pair of forming rolls and the pair of pitch filling rolls, wherein the plurality of rows of slits Hole opening with holes formed , Using a wave plate with a free hole is not formed in the slit hole is from the hole without side of the wave plate which is characterized in that to put into the wave plate manufacturing apparatus.

  In the present invention, since the corrugated sheet material is introduced into the corrugated sheet manufacturing apparatus from the corrugated sheet material side, when the first corrugated portion of the perforated portion reaches the pitch-packed roll pair, it is near the exit of the forming roll pair. Since the holeless portion is pitch-packed to create a steady state, the portion of the first corrugated shape formed in the perforated portion is deformed to the second corrugated shape so as to follow this steady state. For this reason, the portion having the second corrugated shape of the perforated portion does not interfere with the fin guide in the vicinity of the exit of the forming roll pair, and a phenomenon such as bending does not occur. It is possible to pack the pitch with the corrugated sheets arranged in between. Therefore, the corrugated plate with slit holes can be pitch-packed into a desired corrugated plate shape without causing a problem of deformation at the slit hole portion.

  Embodiments of the corrugated sheet manufacturing method according to the present invention will be described below with reference to the drawings.

  1 is an exploded perspective view of a forming roll unit and a pitch filling roll unit of a corrugated sheet manufacturing apparatus, FIG. 2 is a schematic configuration diagram of the corrugated sheet manufacturing apparatus, and FIGS. 3A to 3B are plan views of corrugated sheet materials. 4-6 is the elements on larger scale of each roll part.

  As shown in FIG. 2, the corrugated sheet manufacturing apparatus 100 shown in the present embodiment includes a forming roll unit 11, a pitch filling roll unit 12, and a shaping roll unit 13. Although not shown, a supply roller around which a strip-like corrugated sheet material 10 is wound is disposed on the upstream side of the forming roll unit 11, and the corrugated sheet material 10 set on the supply roller is connected to a feed roll (not shown). Etc., and is continuously sent to the forming roll unit 11. In FIG. 2, only the main part which comprises this manufacturing apparatus 100 is shown, and illustration is abbreviate | omitted about other parts (for example, drive mechanism etc.).

  The forming roll unit 11 includes a pair of upper and lower forming rolls 11a and 11b, and a plurality of forming teeth 110a and 110b are formed on the surfaces of these forming rolls 11a and 11b, respectively, as shown in FIG. The corrugated sheet material 10 is fitted into the forming teeth 110a and 110b at predetermined intervals, and the corrugated sheet material 10 is supplied between the rolls while being rotationally driven in the direction of the arrow. Is called a wave shape). The formed teeth 110a and 110b have a corrugated plate height higher than the corrugated shape of the target corrugated plate height and corrugated pitch (hereinafter referred to as the target corrugated shape) so that the corrugated sheet material 10 does not break during molding. It is set so that it is low and the pitch of the mountain is wide.

  The pitch filling roll unit 12 includes a pair of upper and lower pitch filling rolls 12a and 12b. As shown in FIG. 5, formed teeth 120a and 120b are formed on the surfaces of the pitch filling rolls 12a and 12b, respectively. The corrugated sheet material 10 discharged from the upstream forming roll section 11 has a corrugated shape in which the corrugated plate tops are pressed against each other by being temporarily dammed on the inlet side of the pitch filling roll section 12 (hereinafter referred to as a second corrugated sheet). Called shape). In this second corrugated shape, each corrugated plate top is substantially semicircular. In this state, when the pitch filling rolls 12a and 12b are rotationally driven in the direction of the arrow, the crest portions of the forming teeth 120a and 120b enter between the corrugated corrugated plate top portions, and the corrugated plate top portions while pressing the corrugated plate top portions over the entire surface. Separate each other. As a result, the corrugated plate tops are separated from each other on the exit side, resulting in a corrugated shape having a corrugated pitch wider than the second corrugated shape (hereinafter referred to as a third corrugated shape).

  Here, if the top of the corrugated sheet is moved while being partially pressed, the corrugated sheet material 10 may be deformed. However, in this embodiment, as shown in FIG. 5, the corrugated plate tops are separated from each other while holding the corrugated plate tops over the entire surface, so that the corrugated sheet material 10 can be prevented from being deformed.

  The shaping roll section 13 is composed of a pair of upper and lower shaping rolls 13a and 13b, and molding teeth 130a and 130b are formed on the surfaces of the shaping rolls 13a and 13b, respectively, as shown in FIG. The crest portions of the forming teeth 130a and 130b enter between the corrugated plate tops of the corrugated sheet material 10 formed in the third corrugated shape, and push the gaps between the corrugated plate tops so that the corrugated plate pitch is widened. Here, using the elastic region of the corrugated sheet material 10, the corrugated sheet pitch is expanded so as to be wider than the target value. The corrugated sheet material 10 discharged from the shape forming roll unit 13 is formed into a final target corrugated shape by the corrugated sheet pitch that has been spread reduced by the elastic force.

  Between the forming roll part 11 and the pitch filling roll part 12 and between the pitch filling roll part 12 and the shaping roll part 13, while suppressing the skew in the thickness direction and the width direction of the corrugated sheet material 10, Fin guides 14 and 15 for separating the corrugated sheet material 10 from the formed teeth formed on the roll are arranged.

  Next, the configuration of the fin guides 14 and 15 will be described with reference to FIG. Here, although the fin guide 14 arrange | positioned between the forming roll part 11 and the pitch filling roll part 12 is demonstrated, since the basic structure is the same also about the fin guide 15, description is abbreviate | omitted.

  As shown in FIG. 1, the fin guide 14 includes a plurality of guide blocks 140 stacked in the width direction of the corrugated sheet material 10, and a plurality of jumping plates 141 stacked so as to be sandwiched between the guide blocks 140. The corrugated plate 10 is provided with corrugated side pressing plates 142 attached to both ends in the width direction of the corrugated plate material 10.

  The guide block 140 is a guide member for suppressing the skew (the escape behavior in the vertical direction) of the corrugated sheet material 10 in the vertical direction (thickness direction), and is laminated with every other spring plate 141 interposed therebetween. Has been. The guide block 140 has two positioning holes 140a penetrating in the stacking direction.

  By providing the guide block 140, it is possible to prevent the corrugated sheet material 10 from skewing in the vertical direction when performing pitch packing, particularly between the forming roll unit 11 and the pitch packing roll unit 12. The plate top portions can be reliably brought into pressure contact with each other.

  The spring plate 141 is a guide member for separating the corrugated sheet material 10 that is in close contact with the surface thereof from the forming teeth 110a, 110b, 120a, 120b of each roll. As shown in FIG. 1, when the corrugated sheet material 10 is conveyed in the molding direction, the jumping plate 141 is disposed so that the tip end portion 141 a is positioned between the rows of slit holes 20 formed in the corrugated sheet material 10. Yes. The arrangement interval of the spring plates 141 can be adjusted by the width of the guide block 140.

  In the forming teeth of each roll shown in FIG. 1, a plurality of groove portions are formed along the roll circumference for fitting with the wedge-shaped tip portion 141 a of the spring plate 141. That is, the forming teeth 110a and 110b of the forming rolls 11a and 11b have four groove portions 111a and 111b at positions where they are fitted with the tip end portion 141a of the spring plate 141, and the forming teeth 120a of the pitch filling rolls 12a and 12b. , 120b are formed with four groove portions 121a, 121b at positions where they are fitted with the tip portion 141a of the spring-out plate 141, respectively. Each jumping plate 141 has two positioning holes (not shown) penetrating in the stacking direction.

  The corrugated side pressing plates 142 are guide members for suppressing the skew of the corrugated sheet material 10 in the lateral direction (width direction), and are disposed at both ends of the integrated block in the width direction. The corrugated side pressing plate 142 has four positioning holes 142a that communicate with the positioning holes formed in the guide block 140 and the spring-out plate 141, respectively.

  Since the corrugated side pressing plate 142 can suppress the escape of the corrugated sheet material 10 in the left-right direction when performing pitch packing, particularly between the forming roll unit 11 and the pitch packing roll unit 12, The two can be reliably pressed against each other.

  As shown in FIG. 1, the fin guide 14 according to the present embodiment prepares two blocks in which guide blocks 140 and jumping plates 141 are alternately stacked, and is disposed so as to face each other. 142 is attached, and bolts 143 are passed through the four positioning holes and fastened with nuts 144. An internal space (conveyance path) for allowing the corrugated sheet material 10 to pass therethrough is formed between the blocks arranged vertically.

  In the fin guide 14 configured as described above, the grooves 121a and 121b formed in the pitch filling rolls 12a and 12b and the tip portion 141a of the spring-out plate 141 are fitted to each other. Even when the teeth and the corrugated sheet material 10 are in close contact with each other, the corrugated sheet material 10 is surely secured from the formed teeth of each roll by the tip portion 141a of the jumping plate 141 that has entered between the groove parts 121a and 121b and the corrugated sheet material 10. Can be separated.

  And since the jumping plate 141 is arranged so that the tip part 141a is located between the rows of slit holes 20 formed in the corrugated sheet material 10, the tip part of the jumping plate 141 is placed at the time of pitch packing. It is possible to prevent a trouble that the corrugated sheet material 10 is caught in the slit hole 20 of the corrugated sheet material 10 and is deformed at the slit hole 20 portion.

  Next, a procedure for manufacturing a corrugated sheet using the corrugated sheet manufacturing apparatus 100 configured as described above will be described.

  First, the corrugated sheet material 10 will be described. As shown in FIG. 3A, the corrugated sheet material 10 is formed with a perforated portion 21 in which a plurality of rows of slit holes 20 are continuously formed along the molding direction (the arrow direction in the figure), and the slit holes 20 are formed. It is comprised with the holeless part 22 which is not made. The holeless portion 22 is disposed on the front side in the molding direction with respect to the hole-opening portion 21, and each end portion is connected to the joint portion 23 by soldering. The length L of the holeless portion 22 needs to be at least an initially set length for pitch packing. Specifically, it sets so that it may become the length more than the center distance of the forming roll part 11 and the pitch filling roll part 12. FIG.

  You may connect the perforated part 21 and the non-hole part 22 by another structure. For example, as shown in FIG. 3B, both end portions may overlap each other, and an adhesive may be applied to the overlap portion 24 so as to be connected. Further, as shown in FIG. 3C, the perforated portion 21 and the non-perforated portion 22 are configured by not forming the slit hole 20 by a length L from the tip of one plate material. You may make it do.

  Further, in this embodiment, the slit holes 20 are formed in a plurality of rows along the molding direction, and are formed so that the slit holes 20 overlap when viewed from the width direction of the corrugated sheet material 10 (direction perpendicular to the molding direction). Has been. However, the slit holes 20 need only be formed in a plurality of rows along the molding direction, and the formation position in the width direction is not limited to the example of FIG. 3 (for example, the slit holes 20 are formed in a lattice shape). May be).

  When the perforated part 21 and the non-perforated part 22 are made of the same material, the rigidity of the perforated part 22 is higher than that of the perforated part 21 where the slit hole 20 is formed. Further, different materials may be combined for the perforated portion 21 and the non-perforated portion 22, but even in that case, the perforated portion 22 is set to have a higher rigidity than the perforated portion 21.

  Next, a specific procedure for manufacturing the corrugated sheet will be described.

  First, the forming roll 11a (or other roll) is lifted upward, and the corrugated sheet material 10 is introduced from the holeless portion 22 side, and the tip of the holeless portion 22 passes to the vicinity of the exit of the pitch filling roll portion 12. Let Then, as shown in FIG. 2, the forming roll 11a (or other rolls) is returned to a fixed position, and the forming rolls 11a and 11b of the forming roll unit 11 are rotationally driven in the arrow direction. Thereby, as shown in FIG. 4, the corrugated sheet material 10 is shape | molded by the 1st waveform shape (primary shaping | molding process).

  At this time, the rolls of the pitch filling roll unit 12 and the shape forming roll unit 13 are stopped. In these roll parts, since there is a gap between the rolls, the part of the holeless part 22 that is not formed into the corrugated shape passes through as it is.

  And the holeless part 22 formed in the 1st waveform shape eventually reaches the pitch packing roll part 12, and abuts between the pitch packing rolls 12a and 12b. Thereafter, when the forming rolls 11a and 11b are further driven to rotate, the corrugated sheet material 10 formed into the first corrugated shape is temporarily dammed on the inlet side of the forming roll section 11, and the corrugated sheet is discharged from the forming roll section 11. The tops of the corrugated plates are pressed against each other by force to form a second corrugated shape (this process is called pitch packing). At this time, the pitch filling rolls 12a and 12b may be rotationally driven by a predetermined angle in the direction of the arrow so that the second corrugated portion meshes with the forming teeth 120a and 120b of the pitch filling rolls 12a and 12b.

  Further, as the pitch filling of the holeless portion 22 of the corrugated sheet material 10 proceeds, the unprocessed hole portion 21 reaches the forming roll portion 11 and is formed into the first corrugated shape, and the next pitch filling roll portion 12 is formed. Sent to. At this time, a rigid holeless portion 22 is pitch-packed near the exit of the forming roll portion 11 to create a steady state of the second corrugated plate shape, so that it is formed in the non-rigid hole portion 21. The portion of the first waveform shape is transformed into the second waveform shape so as to follow this steady state. For this reason, the part which becomes the 2nd waveform shape of the perforated part 21 does not interfere with the guide block 140 of the fin guide 14 in the vicinity of the exit of the forming roll part 11, and is bent or stretched around the slit hole. The phenomenon does not occur, and the pitch packing can be performed in a state where the corrugated sheet material 10 is aligned between the forming roll unit 11 and the pitch packing roll unit 12.

  Thereafter, when the forming rolls 11 a and 11 b are continuously driven to rotate, the second corrugated hole portion 21 is accumulated between the forming roll portion 11 and the pitch filling roll portion 12. Then, at the stage where the second corrugated perforated portion 21 is accumulated up to the vicinity of the exit of the forming roll portion 11, the forming roll portion 11, the pitch filling roll portion 12, and the shaping roll portion are driven synchronously, and each of the roll portions The corrugated sheet material 10 is discharged to the downstream side one mountain at a time. After starting this synchronous driving, it is not necessary to temporarily dam the corrugated sheet material 10 between the forming roll unit 11 and the pitch filling roll unit 12, and the first corrugated shape 1 discharged from the forming roll unit 11. The crests are sequentially pressed between the forming roll unit 11 and the pitch filling roll unit 12 to form the second corrugated shape one by one.

  As shown in FIG. 5, with the synchronous drive, as shown in FIG. 5, in the forming teeth 120a and 120b formed on the pitch filling rolls 12a and 12b, the crests enter between the corrugated plate tops where the corrugated sheet material 10 is pressed, and the troughs are corrugated. The corrugated plate tops are separated from each other while pressing the plate tops over the entire surface, and formed into a third corrugated shape having a corrugated plate pitch wider than the second corrugated shape (secondary forming step).

  Subsequently, as shown in FIG. 6, the corrugated sheet material 10 is spread between the tops of the corrugated sheets formed into the third corrugated shape by the forming teeth 130 a and 130 b of the shaping rolls 13 a and 13 b. Thereafter, the corrugated sheet material 10 discharged from the shape forming roll section 13 has a corrugated sheet pitch reduced and is formed into a target corrugated shape (tertiary forming step).

  Thereafter, the corrugated portion formed in the holeless portion 22 of the corrugated sheet material 10 is cut by a cutting machine to complete the corrugated sheet with slits.

  As described above, according to the corrugated sheet manufacturing method according to the present embodiment, the corrugated sheet pitch is changed until the corrugated sheet tops are pressed together by using the corrugated sheet discharging force of the forming roll section 11 in the secondary forming step. Since the material is packed, even when a material having a large repulsive force such as a stainless material is used, the crest does not return after molding, and the corrugated plate shape can be made uniform.

  Further, when the first corrugated portion of the perforated portion 21 reaches the pitch filling roll portion 12, the holeless portion 22 is pitch packed near the outlet of the forming roll portion 11 to create a steady state. The portion of the first waveform shape formed in the non-rigid hole 21 is deformed to the second waveform shape so as to follow this steady state. For this reason, the portion having the second corrugated shape of the perforated portion 21 does not interfere with the guide block 140 of the fin guide 14 in the vicinity of the outlet of the roll portion 11, and a phenomenon such as bending does not occur. And the corrugated sheet material 10 can be pitch-packed in a state where they are aligned between the pitch-packing roll unit 12 and the pitch-packing roll unit 12. Therefore, the corrugated plate with slit holes can be pitch-packed into a desired corrugated plate shape without causing a trouble of deformation at the slit hole 20 (effect of claim 1).

  Therefore, in the corrugated sheet manufacturing method of the present embodiment, there is no variation in the corrugated sheet shape after pitch filling molding, and the corrugated sheet material 10 has slit holes without causing trouble that the corrugated sheet material 10 deforms at the slit hole 20 portion. The corrugated sheet can be pitch-filled into a desired shape.

  Incidentally, in the manufacturing method disclosed in Japanese Patent Application Laid-Open No. 11-147149, the corrugated sheet forming is provided with four steps, and among these, the corrugation is pulled in two steps. However, in this embodiment, since the shape forming process can be reduced by one process, the production line can be shortened.

  In addition, since the corrugated sheet can be processed by corrugated pitch filling (corrugated sheet height> corrugated sheet pitch), the corrugated sheet becomes dense and the material area per volume of the metal carrier increases. Then, the volume can be reduced, and the metal carrier can be downsized. Further, since the angle formed by the flat plate and the corrugated plate after molding is increased, the propagation of the compression force is increased, the drawing process at the time of manufacturing the carrier is omitted, and the brazing characteristics by diffusion bonding can be improved.

  Furthermore, the number of turns is reduced by increasing the height of the corrugated plate, the number of fillets formed by the flat plate and the corrugated plate per unit area of the carrier material is reduced, and the amount of catalyst can be reduced.

  In addition, although the present Example demonstrated the manufacturing method of the corrugated sheet used for the core of a metal support | carrier, this invention is not limited to these uses, It applies to other industrial products generally using the corrugated sheet. be able to.

The disassembled perspective view of the forming roll part and pitch packing roll part of a corrugated sheet manufacturing apparatus. The schematic block diagram of a corrugated sheet manufacturing apparatus. (A)-(b) is a top view of a corrugated sheet material. The elements on larger scale of a forming roll. The partial enlarged view of a pitch filling roll. The elements on larger scale of a shaping roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Corrugated sheet material 11 ... Forming roll part 11a, 11b ... Forming roll 12 ... Pitch filling roll part 12a, 12b ... Pitch filling roll 13 ... Shape shaping roll part 13a, 13b ... Shape shaping roll 14, 15 ... Fin guide 20 ... Slit Hole 21 ... Hole opening part 22 ... No hole part 23 ... Joint part 24 ... Overlapping part 100 ... Corrugated sheet manufacturing apparatus 110a, 120a, 130a ... Molded teeth 111a, 121a ... Groove part 140 ... Guide block 141 ... Bounce plate

Claims (1)

A pair of forming rolls (11a, 11b) for forming a strip-like corrugated sheet material (10) formed with a plurality of rows of slit holes (20) along the forming direction into a first corrugated shape, and the pair of forming rolls (11a, 11b) The corrugated plate tops of the corrugated sheet material (10) discharged from the corrugated plate are pressed together to form a second corrugated shape, and the corrugated plate top portions of the corrugated sheet material (10) are separated from each other to form the second corrugated sheet. The third corrugated roll pair (12a, 12b) having a third corrugated shape having a corrugated sheet pitch wider than the shape, and the third wave of the corrugated sheet material (10) discharged from the pitch compacting roll pair (12a, 12b). A pair of forming rolls (13a, 13b) for forming the corrugated sheet material (10) into a target corrugated sheet shape by spreading between the plate-shaped corrugated sheet tops, the forming roll pair (11a, 11b) and the pitch packing Roll pair (12a, 12 ) A corrugated board manufacturing method according to the arranged guide part (14) corrugated board manufacturing apparatus and a (100) between,
Using a corrugated sheet material (10) comprising a perforated part (21) in which the plurality of rows of slit holes (20) are formed and a holeless part (22) in which no slit holes are formed, The corrugated sheet manufacturing method is characterized in that the corrugated sheet manufacturing apparatus (100) is charged from the holeless portion (21) side of 10).

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