JP2021008131A - Bellows-like corrugated cardboard sheet laminate, connected body of bellows-like corrugated cardboard sheet laminate, and continuous manufacturing method of cardboard sheet - Google Patents

Abstract

To provide a method and an apparatus for supplying a long cardboard sheet without stopping a cardboard box manufacturing apparatus.SOLUTION: The corrugated bellows-like cardboard sheet laminate 11 includes; a bellows-like lamination part 13 where a long cardboard sheet 12 is folded and laminated in a corrugated manner in every desired length; and a splice margin part 12a which is a portion extending from an end of the long cardboard sheet 12 at the undermost layer of the bellows-like lamination part 13 and is projected from the bellows-like lamination part 13.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bellows-shaped corrugated cardboard sheet, which is a kind of long corrugated cardboard sheet used when a large number of corrugated cardboard boxes are continuously manufactured.

Corrugated cardboard boxes are manufactured by folding and assembling blanks (corrugated cardboard blanks) cut out from a corrugated cardboard sheet into a predetermined shape, and vary from standard-sized products with standard length, width, and height to non-standard-sized products. There are types. The corrugated cardboard blank is usually manufactured by cutting out from one plate-shaped corrugated cardboard sheet and making slits and ruled lines at necessary places. When manufacturing corrugated cardboard blanks for manufacturing standard corrugated cardboard boxes, a large amount of corrugated cardboard blanks can be cut out to a certain length and slits and ruled lines can be made continuously and at high speed. Can be manufactured at low cost.

However, in recent years, there has been an increasing demand for so-called on-demand corrugated cardboard box manufacturing, in which cardboard boxes of different sizes are individually manufactured for various items to be packed. In such a case, if corrugated cardboard blanks having various developed shapes are manufactured from a plate-shaped corrugated cardboard sheet of a certain size, there is a lot of waste in cutting out.

Therefore, a device has been proposed in which a long corrugated cardboard sheet is manufactured and stored in advance, pulled out by a required length when required, and a corrugated cardboard blank corresponding to a corrugated cardboard box of a desired size is cut out (for example). See Patent Document 1). This corrugated cardboard blank manufacturing apparatus includes a transport device that pulls out and transports a stocked long corrugated cardboard sheet little by little, a cross-cutting device that makes a cut in a direction orthogonal to the transport direction, and a cut along the transport direction. It is equipped with a vertical cutting device, and the vertical cutting device can move in the width direction (direction orthogonal to the transport direction). The long corrugated cardboard sheet pulled out from the stock was first cut to the required length by a cross-cutting device, and further cut and slit by a cross-cutting device and a vertical cutting device at appropriate positions. Corrugated board blanks of shape and size are manufactured. In many cases, a ruled line is further added at an appropriate place.

In such on-demand corrugated cardboard box manufacturing, if the long corrugated cardboard sheet used as a material is single-sided corrugated cardboard, it can be rolled up and stocked. However, in the case of double-sided corrugated cardboard, which is usually used as a material for corrugated cardboard boxes, it is difficult to wind it into a roll. Therefore, it has been proposed to fold a continuously manufactured double-sided corrugated cardboard into a bellows shape, stock it in that state, and use it for the above-mentioned on-demand corrugated cardboard box manufacturing (for example, Non-Patent Document 1). See). By folding in a bellows shape in this way, both double-sided corrugated cardboard and single-sided corrugated cardboard can be stored as long corrugated cardboard sheets.

International Publication No. WO2014 / 119439

BOX ON DEMAND MACHINE, Panotec S.R.L, [Searched January 9, 2019], Internet <URL: http://www.boxondemand.it/en/box-on-demand-machines/>

In the above-mentioned on-demand corrugated cardboard box manufacturing, corrugated cardboard blanks are sequentially cut out from the front end side of one long corrugated cardboard sheet (bellows-shaped corrugated cardboard sheet) folded in a bellows shape, and the remaining bellows-shaped corrugated cardboard sheet is used. When the length is less than the desired length for the corrugated board blank, a new long corrugated board sheet needs to be replenished. When performing such a replenishment work, it is necessary to temporarily stop the corrugated cardboard box manufacturing apparatus, which lowers the corrugated cardboard box manufacturing efficiency and requires extra manual work. Further, since the remaining bellows-shaped corrugated cardboard sheet is discarded, a small amount of waste of paper occurs.

An object of the present invention is to make it possible to replenish a long corrugated cardboard sheet without stopping the corrugated cardboard box manufacturing apparatus.

One aspect of the present invention made to solve the above problems is
A bellows laminated part in which long corrugated cardboard sheets are folded and laminated in a bellows shape at predetermined lengths,
A portion extending from the end of the long corrugated cardboard sheet in the lowermost layer of the bellows laminated portion, and a joint margin portion protruding from the bellows laminated portion.
It is a bellows-shaped corrugated cardboard sheet laminated body characterized by the above.

When the bellows-shaped corrugated cardboard sheet laminated body according to the present invention is used, another bellows used in the corrugated cardboard box manufacturing apparatus is pulled out from the bellows laminated portion by an appropriate length. By connecting to the joint portion of the corrugated cardboard sheet laminate, a new long corrugated cardboard sheet can be smoothly replenished to the corrugated cardboard box manufacturing apparatus. Further, it can be supplied to the corrugated cardboard box manufacturing apparatus in a state in which a plurality of bellows-shaped corrugated cardboard sheet laminates are connected in advance.

Further, the bellows-shaped corrugated cardboard sheet laminated body according to the present invention is located at the end of the long corrugated cardboard sheet in the uppermost layer of the bellows laminated portion, with respect to the bellows laminated portion, on the side opposite to the protruding side of the joint margin portion. It is preferable to have a second joint margin portion that protrudes and has a length between the height of the bellows laminated portion and a value obtained by subtracting the length of the joint margin portion from the height.

By using these joints and the second joint, when connecting another (next) bellows-shaped corrugated cardboard sheet laminate to one bellows-shaped corrugated cardboard sheet laminate, the connection between the two can be smoothly performed. it can.

It is preferable that the thickness of each of the joint portion and the end portion of the second joint portion is half or less of that of the other portion of the long corrugated cardboard sheet. Since all of these are made of corrugated cardboard, the thickness can be easily reduced to half or less by pressing.

As a result, when one joint margin portion and the other second joint margin portion of the two bellows-shaped corrugated cardboard sheet laminates are connected, there is no significant difference in thickness between the connection portion and the regions before and after the connection portion. Therefore, the long corrugated cardboard sheet can be smoothly supplied to the corrugated cardboard box manufacturing apparatus.

In addition, one of the other aspects of the present invention made to solve the above problems is
A method for producing a continuous corrugated cardboard sheet by connecting two bellows-shaped corrugated cardboard sheet laminates having a joint margin as described above.
The tip of the joint margin portion of one of the two bellows-shaped corrugated cardboard sheet laminates is abutted with the tip of the long corrugated cardboard sheet on the uppermost layer side of the bellows laminated portion of the other bellows-shaped corrugated cardboard sheet laminate. It is a method for manufacturing a continuous corrugated cardboard sheet, which comprises a step and a step of attaching an adhesive tape to the abutted portion.

Furthermore, another one of the other aspects of the present invention made to solve the above problems is
A method for producing a continuous corrugated cardboard sheet by connecting two bellows-shaped corrugated cardboard sheet laminates having a joint portion and a second joint margin portion as described above.
The step of abutting the tip of one joint of the two bellows-shaped corrugated cardboard sheet laminates with the tip of the second joint of the other bellows-shaped corrugated cardboard sheet laminate, and the abutted portion. It is a method for manufacturing a continuous corrugated cardboard sheet, which includes a step of attaching an adhesive tape.

By using the bellows-shaped corrugated cardboard sheet laminate according to the present invention, or by using the method for producing a continuous corrugated cardboard sheet according to the present invention, a long corrugated cardboard sheet can be used for a long time without stopping the corrugated cardboard box manufacturing apparatus. It can be supplied continuously.

The whole view of 1st Embodiment of the bellows-shaped corrugated cardboard sheet laminated body which concerns on this invention. An enlarged view of a joint portion of a long corrugated cardboard sheet constituting the bellows-shaped corrugated cardboard sheet laminate of the first embodiment. The schematic diagram which shows the state of manufacturing the corrugated cardboard blank using the bellows-shaped corrugated cardboard sheet laminated body of 1st Embodiment. FIG. 3 is an enlarged view of two bellows-shaped corrugated cardboard sheet laminates of the first embodiment in which the first joint margin portion and the second joint margin portion of the long corrugated cardboard sheet of the bellows laminated portion are connected. State before connection of the end portion of one first joint margin portion and the end portion of the other second joint margin portion to which one first joint portion of the bellows-shaped corrugated cardboard laminate of the two first embodiments is connected. The figure which shows (a) and the state (b) after connection. The whole view of the 2nd Embodiment of the bellows-shaped corrugated cardboard sheet laminated body which concerns on this invention.

<First Embodiment>
Hereinafter, the first embodiment of the bellows-shaped corrugated cardboard sheet laminate according to the present invention will be described with reference to FIGS. 1 to 5.

<1. Configuration>
FIG. 1 shows the overall configuration of the bellows-shaped corrugated cardboard sheet laminate 11 of the present embodiment. The bellows-shaped corrugated cardboard sheet laminate 11 extends from the edge of the bellows laminated portion 13 in which the double-sided corrugated cardboard sheets 12 are folded and laminated in a bellows shape at predetermined lengths and the bottom layer of the bellows laminated portion 13. It is provided with a joint margin portion 12a, which is a protruding portion and protrudes from the bellows laminated portion 13. The double-sided corrugated cardboard sheet 12 corresponds to the long corrugated cardboard sheet of the present invention. Usually, one bellows-shaped corrugated cardboard sheet laminate 11 is stored on one pallet P in a state of being placed.

The bellows-shaped corrugated cardboard sheet laminate 11 can be manufactured by the following procedure using a double-sided corrugated cardboard sheet (hereinafter referred to as a long double-sided corrugated cardboard sheet) continuously supplied from a double-sided corrugated cardboard manufacturing apparatus (not shown). it can.
First, one fold rule is added to a portion of a predetermined length L1 from the end of the long double-sided corrugated cardboard sheet, and a plurality of fold lines are added for each predetermined length L2 from there. The fold rule may be applied to the entire width direction of the long double-sided corrugated cardboard sheet, or may be a part thereof. Further, creases may be provided intermittently at the center and both ends in the width direction. As shown in FIG. 1, the length L1 corresponds to the protruding length of the joint margin portion 12a (hereinafter referred to as the first joint margin portion), and the length L2 corresponds to the width length of the bellows laminated portion 13. Correspond. The side to be folded may be either one side or both sides of the long double-sided corrugated cardboard sheet, but by making the creases on both sides, the long double-sided corrugated cardboard sheet can be placed on either the front side or the back side. Can be folded in the same way.

Next, the long double-sided corrugated cardboard sheet is long, starting from the fold rule provided at the portion of length L1 from the end thereof, and at the plurality of fold lines provided for each length L2 from there. Fold it in a bellows shape on the pallet P so that the front side and the back side of the double-sided corrugated cardboard sheet are alternately on top. The number of times to fold with the fold rule is set in advance, and the long double-sided corrugated cardboard sheet is cut at the place of the fold rule next to the fold rule to be folded last. In the present embodiment, for example, the number of times of folding is set to an even number so that the cut portion is located on the opposite side of the folding rule that is the starting point described above. As a result, the double-sided corrugated cardboard sheet 12 having a predetermined length is folded in a bellows shape on the upper surface of the pallet P, and the layers are laminated in a substantially horizontal state.

The double-sided corrugated cardboard sheet 12 is folded and laminated in a bellows shape as described above to form the bellows laminated portion 13. In the present embodiment, the number of times the double-sided corrugated cardboard sheet 12 is folded is set so that the height L3 of the bellows laminated portion 13 is slightly longer than twice the length L2 between the fold lines. Further, an end portion having a length L1 protrudes from the lowermost layer of the bellows laminated portion 13, and this portion serves as a first joint margin portion 12a. After that, as shown in FIG. 2, the end portion 121 of the first joint margin portion 12a is pressed in the thickness direction to reduce the thickness to half or less of the original thickness.

Further, the end portion 12b (hereinafter, referred to as the joint margin end portion) of the uppermost layer double-sided corrugated cardboard sheet 12 of the bellows laminated portion 13 is also pressed in the thickness direction to reduce the thickness to half or less of the original thickness. At this time, the length of the joint margin end 12b is made to be substantially the same as the length of the end 121 of the first joint margin 12a. The length of the joint margin portion 12b and the length of the end portion 121 of the first joint margin portion 12a are preferably about 1/2 to 1/5 of the length L1 of the first joint margin portion 12a.

<2. Usage>
The usage mode of the bellows-shaped corrugated cardboard sheet laminate 11 will be described with reference to FIGS. 3 to 5.

FIG. 3 shows a paper feed unit 50 and a transport path 51, which are a part of the corrugated cardboard box manufacturing apparatus M. In this corrugated cardboard box manufacturing apparatus M, the bellows-shaped corrugated cardboard sheet laminate 11 is joined to the installation portion 52 on the upstream side of the transport path 51 (on the left side of the paper feed unit 50 in FIG. 3), and the margin end 12b is on the paper feed unit 50 side. A double-sided corrugated cardboard sheet 12 is supplied to the paper feeding unit 50 so as to be arranged toward the above surface and pulled out from the uppermost layer of the bellows laminated unit 13. The double-sided corrugated cardboard sheet 12 supplied to the paper feeding unit 50 is conveyed to the corrugated cardboard blank manufacturing unit (not shown) by the paper feeding unit 50 and the transport path 51, and the corrugated cardboard blank is cut out from the double-sided corrugated board sheet 12. The cut out cardboard blank is then sent to a cardboard box assembly (not shown) for assembly in a cardboard box.

As shown in FIGS. 3 and 4, a plurality of bellows-shaped corrugated cardboard sheet laminates 11 can be arranged in the installation portion 52. When the installation portion 52 is replenished with the new bellows-shaped corrugated cardboard sheet laminate 11, the user pulls out two layers of the double-sided corrugated cardboard sheet 12 from the uppermost layer of the bellows laminated portion 13 and hangs them down in advance. Since the joint margin end 12b is located on the opposite side of the first joint margin 12a in the uppermost layer of the bellows laminated portion 13, the joint margin end 12b is on the side opposite to the first joint margin 12a. It hangs down along the side surface of the bellows laminated portion 13. At this time, the length L2 and the height L3 are set so that the tip of the joint margin end portion 12b is located near the lowermost layer of the bellows laminated portion 13.

Next, another bellows-shaped corrugated cardboard sheet laminate 11 in which two layers of double-sided corrugated cardboard sheets 12 hang down is provided, and another bellows-shaped corrugated cardboard sheet laminate 11 whose joint margin end 12b is already arranged in the installation portion 52. It is arranged in the installation portion 52 so as to come close to the first joint margin portion 12a of the corrugated cardboard. Then, the joint margin end 12b of the bellows-shaped corrugated cardboard sheet laminate 11 is overlapped and connected to the end portion 121 of the first joint margin portion 12a of another bellows-shaped corrugated cardboard sheet laminate 11. In this case, the other bellows-shaped corrugated cardboard sheet laminate 11 may be in a state in which the double-sided corrugated cardboard sheet 12 is supplied to the paper feeding unit 50 (that is, in a used state), or may be in an unused state. A double-sided tape, an adhesive, a stapler, a stud, or the like can be used to connect the end portion 121 of the first joint margin portion 12a and the joint margin end portion 12b. Further, the end portion 121 of the first joint margin portion 12a and the joint margin end portion 12b may be manually connected or may be automatically connected by using an appropriate connection device.

5 (a) and 5 (b) show a state before connecting the end portion 121 of the first joint margin portion 12a and the joint margin end portion 12b, and a state in which they are connected. As can be seen from these figures, the thickness of the end portion 121 and the joint margin end portion 12b of the first joint margin portion 12a is about half of the original thickness, so that even if both are overlapped and connected, they may be connected. The thickness of the connecting portion is substantially the same as the thickness of the double-sided corrugated cardboard sheet 12.

As described above, in the present embodiment, a plurality of bellows-shaped corrugated cardboard sheet laminates 11 can be connected in advance, and the double-sided corrugated cardboard sheet 12 is continuously manufactured in a corrugated cardboard box in a state where there is no break and there is no large difference in thickness. It can be sent to the paper feed unit 50 of the device M.

<Second Embodiment>
Hereinafter, a second embodiment of the bellows-shaped corrugated cardboard sheet laminate according to the present invention will be described with reference to FIG. 6, focusing on a portion different from the first embodiment. The same parts as those in the first embodiment are designated by the same reference numerals.

The bellows-shaped corrugated cardboard sheet laminated body 21 of the present embodiment includes a bellows laminated portion 23, a first joint margin portion 12a, and a second joint margin portion 22b, and the configuration of the second joint margin portion 22b is the same as that of the first embodiment. It's different.

As shown in FIG. 6, the second joint margin portion 22b is formed from the uppermost layer to the lowest layer of the bellows laminated portion 23 along the side surface of the bellows laminated portion 23 on the side opposite to the protruding side of the first joint margin portion 12a. It consists of a part that hangs down to the vicinity. The length L5 of the second joint margin portion 22b is set to a length between the height L4 of the bellows laminated portion 23 and the value obtained by subtracting the length L1 of the first joint margin portion 12a from the height L4. ing.

The bellows-shaped corrugated cardboard sheet laminate 21 is basically manufactured by the same procedure as the bellows-shaped corrugated cardboard sheet laminate 11 of the first embodiment, but the final step is different. That is, a long double-sided corrugated cardboard sheet with folds is folded at a plurality of folds starting from the folds given to the length L1 from the end thereof, and the bellows laminated portion having a height of L4. After forming the 23, the bellows laminated portion 23 is cut at a length L5 from the crease at the end of the uppermost layer. The portion of the length L5 protruding from the crease at the end of the uppermost layer of the bellows laminated portion 23 becomes the second joint margin portion 22b, and this second joint margin portion 22b is downward along the side surface of the bellows laminated portion 23. Bend. After that, the end portion of the second joint margin portion 22b is pressed in the thickness direction to reduce the thickness to half or less of the original thickness. As described above, the bellows-shaped corrugated cardboard sheet laminate 21 is completed.

With the above configuration, in the present embodiment, it is possible to save the trouble of pulling out the second joint margin portion 22b to the lowest layer of the bellows laminated portion 23.

<Modification example>
In the above embodiment, the bellows-shaped corrugated cardboard sheet laminate is constructed by using the double-sided corrugated cardboard sheet, but the single-sided corrugated cardboard may be used.
In the above embodiment, both the thickness of the end portion 121 of the first joint margin portion 12a and the thickness of the end portion of the joint margin portion 12b or the second joint margin portion 22b are reduced to half or less of the original thickness. The thickness of only one joint margin portion 12a, or only the end portion of the joint margin portion 12b or the second joint margin portion 22b may be reduced to half or less of the original thickness. Further, either the end portion 121 of the first joint margin portion 12a and the end portion of the joint margin end portion 12b or the second joint margin portion 22b may be at least half the original thickness, or the thickness may be reduced. You don't have to. For example, when the tip of the first joint and the end of the joint or the tip of the second margin are abutted and connected, it is not necessary to reduce the thickness of any of them.

In the first embodiment, two layers of double-sided corrugated cardboard sheets are pulled out from the uppermost layer of the bellows-shaped corrugated cardboard sheet laminate 11 newly replenished to the installation portion 52 and hung down, and the joint margin end portion 12b is the bellows laminated portion. It was connected to the end portion 121 of the first joint margin portion 12a of another bellows-shaped corrugated cardboard sheet laminate 11 already arranged in the installation portion 52 so as to be located near the bottom layer of 13, but is newly replenished. In a state where three or more layers of double-sided corrugated cardboard sheets are pulled out from the bellows-shaped corrugated cardboard sheet laminate 11, the joint margin end portion 12b and the end portion 121 of the first joint margin portion 12a of another bellows-shaped corrugated cardboard sheet laminate 11 You may connect. In this case, the joint margin end portion 12b and the end portion 121 of the first joint margin portion 12a are not brought close to the newly replenished bellows-shaped corrugated cardboard sheet laminate 11 and another bellows-shaped corrugated cardboard sheet laminate 11. You can connect.

Further, in the first embodiment, when two layers of double-sided corrugated cardboard sheets are pulled out from the uppermost layer of the newly replenished bellows-shaped corrugated cardboard sheet laminate 11 and hung down, the joint margin end portion 12b becomes the bellows laminated portion 13. The length L2 and the length L3 are set so as to be located near the bottom layer of the corrugated cardboard, but the lengths of both may be set independently of each other.

11, 21 ... Bellows-shaped corrugated cardboard sheet laminate 12 ... Double-sided corrugated cardboard sheet 12a ... 1st joint margin 121 ... 1st joint margin end 12b ... Joint margin end 13, 23 ... Bellows laminate 22b ... 2nd joint Margin L1 ... Length of the first joint margin L2 ... Length from the fold rule of the bellows laminated portion to the fold rule L3, L4 ... Height of the bellows laminated portion L5 ... Length of the second joint margin

Claims (11)

A bellows laminated part in which long corrugated cardboard sheets are folded and laminated in a bellows shape at predetermined lengths,
A portion extending from the end of the long corrugated cardboard sheet in the lowermost layer of the bellows laminated portion, and a joint margin portion protruding from the bellows laminated portion.
A bellows-shaped corrugated cardboard sheet laminate with. The length of the joint margin is not more than half of the predetermined length.
The bellows-shaped corrugated cardboard sheet laminate according to claim 1. At the end of the long corrugated cardboard sheet on the uppermost layer of the bellows laminated portion, it protrudes to the side opposite to the protruding side of the joint margin portion, and the height of the bellows laminated portion and the length of the joint margin portion from the height. With a second seam having a length between the reduced values,
The bellows-shaped corrugated cardboard sheet laminate according to claim 1 or 2. A connector of a bellows-shaped corrugated cardboard sheet laminate, which is formed by joining a plurality of bellows-shaped corrugated cardboard sheet laminates according to claim 1 or 2.
The length of the tip of one of the joint margins of two adjacent bellows-shaped corrugated cardboard sheet laminates and the length of the uppermost layer side of the bellows laminate of the other bellows-shaped corrugated cardboard sheet laminate. A connecting body of bellows-shaped corrugated cardboard sheet laminates that are abutted and connected to the tip of a corrugated cardboard sheet. A connecting body of bellows-shaped corrugated cardboard sheet laminates, which is formed by joining a plurality of bellows-shaped corrugated cardboard sheet laminates according to claim 3.
The tip of one joint of two adjacent bellows-shaped corrugated cardboard sheet laminates and the tip of the second joint of the other bellows-shaped corrugated cardboard sheet laminate are thrust from each other. A composite of bellows-shaped corrugated board sheet laminates that are joined together and connected. A connector of a bellows-shaped corrugated cardboard sheet laminate, which is formed by joining a plurality of bellows-shaped corrugated cardboard sheet laminates according to claim 1 or 2.
One end of the joint margin of two adjacent bellows-shaped corrugated cardboard sheet laminates and the uppermost layer side of the bellows laminate of the other bellows-shaped corrugated cardboard sheet laminate. A connecting body of bellows-shaped corrugated cardboard sheet laminates in which the ends of long corrugated cardboard sheets are overlapped and connected. A connecting body of bellows-shaped corrugated cardboard sheet laminates, which is formed by joining a plurality of bellows-shaped corrugated cardboard sheet laminates according to claim 3.
The end of one joint of two adjacent bellows-shaped corrugated cardboard sheet laminates and the end of the second joint of the other bellows-shaped corrugated cardboard sheet laminate. A connecting body of bellows-shaped corrugated cardboard sheet laminates, which are overlapped and connected. A method for producing a continuous corrugated cardboard sheet by joining two bellows-shaped corrugated cardboard sheet laminates according to claim 1 or 2.
The tip of the joint margin portion of one of the two bellows-shaped corrugated cardboard sheet laminates is abutted with the tip of the long corrugated cardboard sheet on the uppermost layer side of the bellows laminated portion of the other bellows-shaped corrugated cardboard sheet laminate. A method for manufacturing a continuous corrugated cardboard sheet, which comprises a step and a step of attaching an adhesive tape to the abutted portion. A method for producing a continuous corrugated cardboard sheet by joining two bellows-shaped corrugated cardboard sheet laminates according to claim 3.
The step of abutting the tip of one joint of the two bellows-shaped corrugated cardboard sheet laminates with the tip of the second joint of the other bellows-shaped corrugated cardboard sheet laminate, and the abutted portion. A method for manufacturing a continuous corrugated cardboard sheet, which comprises a step of attaching an adhesive tape. A method for producing a continuous corrugated cardboard sheet by joining two bellows-shaped corrugated cardboard sheet laminates according to claim 1 or 2.
The end of the joint margin of one of the two bellows-shaped corrugated cardboard sheet laminates and the end of the long corrugated cardboard sheet on the uppermost layer side of the bellows laminate of the other bellows-shaped corrugated cardboard sheet laminate. A method for manufacturing a continuous corrugated cardboard sheet, which comprises a step of superimposing and a step of connecting the superposed portions. A method for producing a continuous corrugated cardboard sheet by joining two bellows-shaped corrugated cardboard sheet laminates according to claim 3.
A step of superimposing the end of one joint of the two bellows-shaped corrugated cardboard sheet laminates and the end of the second seam of the other bellows-shaped corrugated cardboard sheet laminate, and the superposition thereof. A method for manufacturing a continuous corrugated cardboard sheet, which comprises a step of connecting the parts.

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