JP6911990B2 - Cardboard material and cardboard boxes using it - Google Patents

Description

The present invention relates to a bellows-folded corrugated cardboard material and a corrugated cardboard box using the same.

Corrugated cardboard material with bellows fold (also called "fan fold") is known as a material for box making. The corrugated cardboard material is provided with creases between continuous rectangular sheets, and the sheets are alternately folded back at the folds. In such a bellows-folded corrugated cardboard material, continuous sheets are stacked one above the other and folded into a rectangular parallelepiped packaging.

The above cardboard materials are box-making systems (“automatic packaging system”, “three-side variable system”, “three-side automatic packaging”, and “on-demand packaging” that manufacture boxes of the optimum size according to the size of the object to be packaged. It is also used as a packaging material. In this box making system, the following three steps are carried out.
・ Feed process: Process of feeding out bellows-folded cardboard material ・ Cutting process: Process of cutting out flat cardboard material fed in the feed process ・ Folding process: Process of assembling a box from the cardboard material cut out in the cutting process

Special Table 2013-513869

However, in the bellows-folded corrugated cardboard material, "deflection" may occur in which the upper central portion of the rectangular parallelepiped packaging is sunk in the vertical direction. The sheet may be broken at the bent part. In addition, when a bellows-folded corrugated cardboard material is used as a material for a box-making system, depending on the state of deflection of the corrugated cardboard material, the sheet may not be satisfactorily fed out from the corrugated cardboard material, resulting in poor paper feed stability (feedability). May be compromised.

This case was created in view of the above issues, and one of the purposes is to achieve both suppression of deflection and ensuring feedability. Not limited to this purpose, it is also possible that the actions and effects derived from each configuration shown in the “mode for carrying out the invention” described later and which cannot be obtained by the conventional technique are exhibited. It can be positioned as another purpose.

The cardboard material disclosed here is a second piece that is orthogonal to the first direction in a plane along the fold at each of the folds in which a rectangular sheet extends linearly along the first direction in continuous cardboard. It is a bellows-folded cardboard material that is folded back in a direction and the sheets are stacked along a third direction that is orthogonal to both the first direction and the second direction and is along the vertical direction.
In the plurality of folds of the corrugated cardboard material, there are two folds of the first shape in which the sheet is folded over only one of the plurality of ridges forming the corrugated cardboard. It includes a second-shaped crease having a shape in which the sheet is folded over the mountain. Among all the folds, the ratio of the folds of the second shape is 0.5 [%] or more and 13 [%] or less.

According to this case, it is possible to suppress the deflection of the corrugated cardboard material in the central portion and to secure the feedability of the corrugated cardboard material in the box making system.

It is a perspective view which shows the corrugated cardboard material of a bellows fold. It is a schematic diagram explaining the structure A. It is a schematic diagram explaining the configurations B to D. It is a schematic diagram explaining the structure E. It is a schematic diagram explaining the structure F. (A) and (b) are schematic views explaining the shape of the OK fold with respect to the configuration F. (A) and (b) are schematic views explaining the shape of the NG fold with respect to the configuration F. It is a schematic diagram explaining the deflection of the central part with respect to the structure F.

Hereinafter, a corrugated cardboard material and a corrugated cardboard box as embodiments will be described.
The corrugated cardboard material of the present embodiment is a bellows-folded box-making material in which a rectangular sheet is folded in continuous corrugated cardboard. As this corrugated cardboard material, double-sided corrugated cardboard having liners on both sides with respect to the core is used.

The above double-sided cardboard includes single-flute cardboard composed of three base papers (materials) corresponding to one core and two liners, as well as so-called "double-sided cardboard" and "double-sided cardboard". Also included are multi-flute cardboard composed of three or more cores (including one or more middle liners) and five or more base papers corresponding to each of the two liners. In this embodiment, a corrugated cardboard material made of double-sided corrugated cardboard of a single flute is mainly exemplified.

When the cardboard material is made into a box, it becomes a cardboard box. Specifically, the corrugated cardboard material used as the box-making material of the box-making system has a feed process in which the sheets are sent out in sequence, a cutting process in which the sent-out sheets are cut out in a box development pattern, and folding into a box shape. It is made into a cardboard box through various processes such as a folding process in which it is erected. The box-making system for assembling the cardboard box is not particularly limited, but for example, "Carton Wrap 1000 manufactured by CMC" and "CVP-500 manufactured by Neopost", which are fully automatic systems (fully automatic machines) of the automatic packaging system. , "TXP-600 made by OS Machinery", "EM7 made by Pack Size" of semi-automatic system (semi-automatic machine) that performs from feed process to cutting process, "Compack made by Panotec", "made by HOMAG" "PAQTEC C-200" and "PAQTEC C-250 manufactured by HOMAG" can be used.

In the present embodiment, it is assumed that the corrugated cardboard material is placed on a horizontal plane by giving an example in which the following directions I and II correspond as shown in Table 1 below.
-Direction I: Direction in the corrugated cardboard placed on the horizontal plane-Direction II: Direction in the semi-finished product in the middle of manufacturing the cardboard material

The vertical direction (first direction, marked as "CD" in the figure) and the horizontal direction (second direction, marked as "MD" in the figure) are horizontal directions and along the sheet (crease). The direction in which the plane extends. These vertical and horizontal directions are orthogonal to each other. The height direction (third direction, indicated by "TD" in the figure) is a direction along the vertical direction and is orthogonal to both the vertical direction and the horizontal direction. This height direction corresponds to the direction in which the sheets are overlapped.

The MD (Machine Direction) direction is also referred to as a "flow direction", and is a direction in which the corrugated cardboard material manufacturing process progresses from upstream to downstream. The CD (Cross Direction) direction is a direction orthogonal to the MD direction in a plane along the MD direction. The TD (Transverse Direction) direction is a direction orthogonal to both the MD direction and the CD direction.
In addition, unless otherwise specified, the expression "numerical value X to numerical value Y" in this embodiment means a range of numerical value X or more and numerical value Y or less.

[I. One Embodiment]
In one embodiment below, the configuration of the corrugated cardboard material will be described in items [1] and [2]. Item [1] describes a structure in which the corrugated cardboard material is folded (hereinafter referred to as “folded structure”). Item [2] describes the parameters related to the folding of the corrugated cardboard material.
Then, the actions and effects of the configurations of items [1] and [2] will be described in item [3].

[1. Folding structure]
As shown in FIG. 1, the corrugated cardboard material 1 is a box-making material having a rectangular parallelepiped shape.
In the corrugated cardboard material 1, the continuous rectangular sheet 2 (partially marked in FIG. 1) is folded back at the fold F (only partly coded in FIG. 1), and the folded sheet 2 is Stacked in the height direction.
In the corrugated cardboard material 1 folded in this way, a plurality of folds F extend linearly along the vertical direction on a pair of side surfaces along both the vertical direction and the height direction.

Here, the folding structure of the corrugated cardboard material 1 will be described by focusing on three consecutive sheets 2 (indicated by a two-dot chain line in FIG. 1).
1st sheet 21: Sheet 2 continuous on one side of the 2nd sheet 22
Second sheet 22: Sheet 2 continuous with both the first sheet 21 and the third sheet 23
3rd sheet 23: Sheet 2 continuous with the other side of the second sheet 22

The first fold F1 is provided between the first sheet 21 and the second sheet 22, and the sheets 21 and 22 are continuous via the first fold F1. A second fold F2 is provided between the second sheet 22 and the third sheet 23, and the sheets 22 and 23 are continuous via the second fold F2.
The first fold F1 is a fold F in which the second sheet 22 is folded back toward one side (right side in FIG. 1) with respect to the first sheet 21, and the other side in the corrugated cardboard material 1 (right side in FIG. 1). It is arranged on the left side in FIG. The second fold F2 is a fold F in which the third sheet 23 is folded back toward the other side in the lateral direction (left in FIG. 1) with respect to the second sheet 22, and the second fold F2 is one in the lateral direction (one in the corrugated cardboard material 1). It is arranged on the right side in FIG.

_{In the first sheet 21, the corrugated cardboard wave 10 is formed in the first} end edge E 1 (in FIG. 1, only the front edge is marked) extending in the lateral direction (the direction intersecting the crease F). Be exposed. _{Similarly, on the second sheet 22, the cardboard is provided on the second edge E 2} extending in the lateral direction (the direction intersecting the crease F) (in FIG. 1, only the front edge is marked). Wave 10 is exposed.
In the sheet pair 20 composed of the first sheet 21 and the second sheet 22, the first end edge E ₁ and the second end edge E ₂ are arranged adjacent to each other in the height direction.

According to the corrugated cardboard material 1 having the above-mentioned folding structure, even a material that is difficult to wind in a roll shape can be folded into a rectangular parallelepiped shape. That is, the corrugated cardboard sheet 2 having a higher strength than the material that can be wound in a roll shape can be made into a compact packaging. The corrugated cardboard material 1 in which the sheet 2 whose strength is ensured is folded in this way is suitable for use as a packaging material for a box-making system for manufacturing a box in which strength is required.

In addition, the fold F is provided along the corrugated cardboard wave 10. In other words, the corrugated cardboard material 1 having a wave 10 perpendicular to the MD direction is manufactured.
The corrugated cardboard material 1 is preferably wrapped (wrapped) with a packaging film in order to prevent stains and collapse of the load.

[2. Parameters]
Hereinafter, the parameters of the corrugated cardboard material 1 will be described.
First, basic parameters such as the size of the corrugated cardboard material 1 and the thickness dimension of the sheet 2 will be described. After that, the parameters related to the folding of the corrugated cardboard material 1 will be described in detail.

[2-1. Basic parameters]
<Size>
The size of the corrugated cardboard material 1 is determined from the following dimensions L1 to L3.
-Vertical dimension L1: Vertical dimension (first dimension)
-Horizontal dimension L2: Horizontal dimension (second dimension)
-Height dimension L3: Dimension in the height direction (third dimension)
The smaller the dimensions L1 to L3, the greater the restrictions on the size and shape of the box to be manufactured, and the larger the size, the lower the workability such as transportation and delivery. From these viewpoints, the dimensions L1 to L3 are preferably in the range shown in Table 2 below.

<Thickness dimension>
The sheet 2 in the cardboard material 1 has an A flute with a thickness dimension of 5 [mm], a B flute with a thickness dimension of 3 [mm], a C flute with a thickness dimension of 4 [mm], and a thickness dimension of 1.5 [mm. ] E flute, double flute that combines any two types of flute (thickness dimension is 6 to 10 [mm]), and various standard thickness dimensions can be adopted, and non-standardized thickness dimensions are adopted. You may.

The larger the thickness dimension, the better the cushioning property, but the stronger the sheet 2, the more easily it is crushed. In consideration of these tendencies, the thickness dimension used for the sheet 2 of the corrugated cardboard material 1 is preferably 1 [mm] to 10 [mm], and is 1.5 [mm] to 8 [mm]. Is more preferable.

<Others>
In addition, if the number of folds F in the corrugated cardboard material 1 is N [sheets], the number of sheets 2 is N + 1 [sheets]. In this case, the N + 1 [stage] sheets 2 are overlapped on the cardboard material 1.
Furthermore, the height dimension per step corresponding to one sheet 2 can be calculated by dividing the height dimension L3 of the corrugated cardboard material 1 by the number of steps N + 1 of the sheet 2. The height dimension per step calculated in this way corresponds to the thickness dimension of the sheet 2 in the corrugated cardboard material 1.

For example, as the number of stages of the corrugated cardboard material 1, for example, various stages of 10 to 1000 [stages] can be mentioned. For the corrugated cardboard material to which the parameters related to folding, which will be described in detail later, are measured, it is preferable to measure the parameters at each of all the stages for the measurement target having less than a predetermined number of stages (for example, 100 [stages]). On the other hand, for the measurement target having a predetermined number of stages (for example, 100 [stages]) or more, the parameters are measured partially (for example, a portion divided into parts or a set area).

From the relationship between the height dimension L3 and the number of steps as described above, it is possible to calculate a preferable range set for the number N of folds F in the corrugated cardboard material 1. Specifically, the range of the value obtained by subtracting "1" from the value obtained by dividing the height dimension L3 in the preferable range by the thickness dimension of the sheet 2 is approximated as a preferable range set in the number N of the folds F. be able to.

An arbitrary basis weight can be set for the sheet 2 used for the corrugated cardboard material 1. The range of the basis weight adopted for the sheet 2 includes a range of 50 to 1500 [g / m ² ], preferably a range of 100 to 1000 [g / m ² ], and more preferably 200 to 200. The range of 800 [g / m ² ] is mentioned, and more preferably the range of 200 to 600 [g / m ² ] is mentioned.
The weight of the corrugated cardboard material 1 is calculated by adding the step ratio of the core to the above basis weight and multiplying the vertical dimension L1 and the horizontal dimension L2 by the number of steps N + 1 of the sheet 2.

[2-2. Folding parameters]
The corrugated cardboard material 1 of the present embodiment has a predetermined configuration regarding folding of the sheet 2 based on at least one of the viewpoints I to VIII listed below.
・ Viewpoint I: Ensuring the appearance (appearance) of the boxed box ・ Viewpoint II: Ensuring the strength of the boxed box ・ Viewpoint III: Ensuring the feedability of the corrugated cardboard material 1 to be boxed -Viewpoint IV: Suppressing damage to the packaging film-Viewpoint V: Improving the safety of the cardboard material 1 for the handler-Viewpoint VI: Ensuring the stability of the placed cardboard material 1 -Viewpoint VII: Ensuring the accuracy of the box made-Viewpoint VIII: Suppressing deflection with the cardboard material 1.

The above viewpoints I to VIII are viewpoints for solving the following problems I to VIII in which the common ordinal numbers I to VIII are described.
・ Problem I: The appearance of the boxed box deteriorates ・ Problem II: The strength of the boxed box is insufficient ・ Problem III: The feedability of the corrugated cardboard material to be boxed deteriorates ・ Problem IV : The packaging film is damaged-Problem V: There is room for improvement in the safety of the cardboard material 1 for the handler-Problem VI: The placed cardboard material 1 is unstable-Problem VII: The accuracy of the box made is reduced. ・ Problem VIII: There is room for improvement in suppressing deflection with cardboard material 1.

It can be said that the problems I and II are caused by the fact that when the cardboard material 1 is assembled into a box, a portion different from the ruled line for box making is folded. The viewpoints I and II can be said to be based on ensuring box-making property in order to solve such problems I and II.
Problem III can be said to be a problem that the sheet 2 is not satisfactorily fed out from the corrugated cardboard material 1 and the paper feed stability is lowered. It can be said that the viewpoint III is based on ensuring the paper feed stability in order to solve the problem III.
Problem IV can be said to be a problem that the film that wraps the corrugated cardboard material 1 may be torn. The viewpoint IV can be said to be a viewpoint based on suppressing the tearing of the film in order to solve such a problem IV.

Problem VI can also be said to be a problem that when the corrugated cardboard material 1 is transported for use in a box-making system, the corrugated cardboard material 1 may deteriorate in transportability such as formability and stability. The viewpoint VI can be said to be a viewpoint based on ensuring transportability in order to solve such a problem VI.
Further, it can be said that the problem VI is a problem that when a work machine or other materials collide with the stationary cardboard material 1, the uprightness such as the shape and stability of the cardboard material 1 may be deteriorated. .. The viewpoint VI can be said to be a viewpoint based on ensuring uprightness in order to solve such a problem VI.
Problem VIII can be said to be a problem that the bending of the corrugated cardboard material 1 may cause the sheet to be bent or bent.

The predetermined configuration specified from the above viewpoints I to VIII includes at least one of the configurations A to F'shown below.
-Structure A: The ratio of the folds F forming a predetermined defective state is equal to or less than the predetermined ratio-Structure B: The variation in the position of the fold F when viewed from the vertical direction is within the predetermined position range-Construction C : The polymerization dimension is within the predetermined thickness magnification range with respect to the reference dimension.-Structure D: The interval between the folds F is within the predetermined distance magnification range with respect to the reference dimension.-Structure E: Sheet to 20 Edge edges E ₁ and E ₂ have a predetermined orientation ・ Configuration F: The ratio of the fold F of the predetermined shape is within the predetermined first ratio range ・ Configuration F ′: Of the crease F of the predetermined shape The ratio is within the specified second ratio range

<Structure A>
As described above, the configuration A is "the ratio of the folds F forming a predetermined defective state is equal to or less than the predetermined ratio".
The "crease F forming a defective state" of the configuration A includes a state in which a gap exists between the sheets 2 around the fold F.

For example, as shown on the lower side of FIG. 2, when a fold FA is generated in addition to the set fold F, it should be folded in two at the fold F, but other than the fold F. It will be in a state where it is folded at a point or a state where the folded part is doubled (so to speak, "tri-fold"). In such a state, if the sheet 2 is in a good state, it extends in a plane as shown on the upper side of FIG. 2, whereas the sheet 2 is folded and bent by FA, and the first sheet of the sheet to 20 is formed. A gap S (so-called "eye") may occur between the 21 and the second sheet 22.
The "vacancy S" referred to here is a void existing 15 [mm] inside from the folded end portion of the corrugated cardboard material 1, and the void included in the "crease F forming a defective state" is the area thereof. Refers to those whose (side area) is 25 [mm ^{2] or more.}
In addition, the "fold F that forms a defective state" in the configuration A may include a state in which the fold F is damaged.

Examples of the state in which the fold F is damaged include the following states 1A and 1B.
・ State 1A: There is a thread or crush in the fold F ・ State 2A: The state where the fold F is torn

The inventors of the present application have found that if the proportion of the fold F in the above-mentioned defective state among all the folds F is lower than the predetermined proportion, the above-mentioned problems I and II tend to be suppressed. rice field. Conversely, it was found that if the proportion of the fold F in the defective state among all the folds F is higher than the predetermined proportion, problems I and II tend to occur.
That is, the corrugated cardboard material 1 is provided with the configuration A based on the above-mentioned viewpoints I and II. In addition, according to the configuration A, the cardboard material 1 is provided with the configuration A based on the viewpoint III from the finding that the above-mentioned problem III also tends to be suppressed.

The "predetermined ratio" of the configuration A is a percentage of the number n of the folds F, which is a defective state with respect to the total number N of the folds F, and may be referred to as a defective rate or a defect rate of the folds F.
This predetermined ratio is 10 [%], preferably 8.0 [%], and more preferably 2.0 [%] from the above-mentioned viewpoints I, II or III.

<Structure B>
The configuration B is “the variation in the position of the fold F when viewed from the vertical direction is within a predetermined position range” as described above.
The "position of the fold F" of the configuration B is a position in the lateral direction.
Further, as shown in FIG. 3, the “variation in the position of the crease F” is the variation in the dimension (hereinafter referred to as “separation dimension”) BL in which the crease F is laterally separated from the reference position BS. .. The "variation in the position of the crease F" can be said to be the deviation of the end face of the corrugated cardboard material 1.

The reference position BS is preset as a standard position of the fold F. For example, the reference position BS is set on a vertical line passing through the fold F which is the most recessed in the vertical direction when observed from the horizontal direction.
The inventors of the present application have found that the above-mentioned problem IV tends to be suppressed if the variation of the separation dimension BL is within a predetermined position range. Conversely, it has been found that if the variation of the separation dimension BL is outside the predetermined position range, the problem IV tends to occur.

That is, the corrugated cardboard material 1 is provided with the configuration B based on the above-mentioned viewpoint IV.
In addition, according to the configuration B, the cardboard material 1 is provided with the configuration B based on the viewpoint III, V, VI from the finding that the above-mentioned problems III, V, and VI also tend to be suppressed.
A part of the corrugated cardboard material 1 is excluded from the measurement target of the separation dimension BL. This is because the end face is likely to be displaced during artificial work such as transportation work or installation work of corrugated cardboard material, which is likely to cause disturbance (factor) that lowers the accuracy of the measurement result. For example, in the case of corrugated cardboard material of 330 [stage], 30 [stage] from the top is excluded from the measurement target of the separation dimension BL, and in the case of corrugated cardboard material of 60 [stage], the upper and lower 5 [stage] are the separation dimension BL. Excluded from measurement.
The “within a predetermined position range” of the configuration B is less than 50 [mm], preferably less than 22 [mm], and more preferably less than 15 [mm].

<Structure C>
The configuration C is “the polymerization dimension is within a predetermined thickness magnification range with respect to the reference dimension” as described above.
As shown in FIG. 3, the "polymerization dimension CL" of the configuration C is the thickness dimension of the sheet pair 20 at the portion folded back by a predetermined dimension LP (here, 5 [mm]) along the lateral direction from the crease F. be. On the other hand, the "reference dimension TS" of the configuration C is the thickness dimension of the sheet 2 per sheet.

The inventors of the present application have found that if the polymerization dimension CL is within a predetermined thickness magnification range with respect to the reference dimension TS, the above-mentioned problem VI tends to be suppressed. Conversely, it has been found that if the polymerization dimension CL is outside the predetermined thickness magnification range with respect to the reference dimension TS, the problem VI tends to occur.
That is, the corrugated cardboard material 1 is provided with the configuration C based on the above-mentioned viewpoint VI.
In addition, according to the configuration C, based on the finding that the above-mentioned problems II, III, IV, and V also tend to be suppressed, the configuration C is provided in the corrugated cardboard material 1 based on the viewpoints II, III, IV, and V. There is.

The “within a predetermined thickness magnification range” of the configuration C is 1.0 [times] or more and less than 3.0 [times], and 1.25 [times] or more and less than 2.5 [times]. Is more preferable, and more preferably 1.5 [times] or more and less than 2.0 [times].
Speaking of specific dimensions, when the reference dimension TS is 4 [mm], the polymerization dimension CL is 4 [mm] or more and less than 12 [mm], and 5 [mm] or more. It is preferably less than 10 [mm], more preferably 6 [mm] or more and less than 8 [mm].

<Structure D>
The configuration D is “the distance between the folds F is within a predetermined distance magnification range with respect to the reference dimension” as described above.
As shown in FIG. 3, the “distance DI” of the configuration D is the distance between the folds F adjacent to each other in the height direction and separated from each other in the height direction. The "reference dimension TS" of the configuration D is the same as the "reference dimension TS" described above in the configuration C.

The inventors of the present application have found that if the interval DI is within a predetermined distance magnification range with respect to the reference dimension TS, the above-mentioned problem VI tends to be suppressed. Conversely, it has been found that if the interval DI is outside the predetermined distance magnification range with respect to the reference dimension TS, the problem VI tends to occur.
That is, the corrugated cardboard material 1 is provided with the configuration D based on the above-mentioned viewpoint VI. In addition, from the finding that the above-mentioned problems III and V tend to be suppressed, the corrugated cardboard material 1 is provided with the configuration D based on the viewpoints III and V.

The “within a predetermined distance magnification range” of the configuration D is 1.0 [times] or more and less than 3.0 [times], and 1.25 [times] or more and less than 2.5 [times]. It is preferable that it is 1.8 [times] or more and less than 2.0 [times].
Speaking of specific dimensions, when the reference dimension TS is 4 [mm], the interval DI is 4 [mm] or more, less than 12 [mm], and 5 [mm] or more. It is preferably less than 10 [mm], and more preferably 7.2 [mm] or more and less than 8 [mm].

<Structure E>
The configuration E is “the edges E ₁ and E _{2 of the} sheet to 20 are in a predetermined orientation” as described above.
As shown in FIG. 4, the "predetermined orientation" of the configuration E is determined by the angle (hereinafter referred to as "intersection angle") θ formed by the _first end edge E 1 and the second end edge E _{2 of the seat pair 20.} Is less than the crossing angle of.

The inventors of the present application have found that if the intersection angle θ is less than a predetermined intersection angle, the above-mentioned problem III tends to be suppressed. Conversely, it was found that if the crossing angle θ is equal to or greater than a predetermined crossing angle, Task III tends to occur.
That is, the corrugated cardboard material 1 is provided with the configuration E based on the above-mentioned viewpoint III. In addition, from the finding that the above-mentioned problems II, V, VI, and VII also tend to be suppressed, the corrugated cardboard material 1 is provided with the configuration E based on the viewpoints II, V, VI, and VII.
The "predetermined crossing angle" referred to here is 0.30 [°], preferably 0.25 [°], more preferably 0.15 [°], and 0.05 [°]. ] Is even more preferable.

<Structure F>
As described above, the configuration F is "the ratio of the fold F of the predetermined shape is within the predetermined first ratio range". The fold F having the “predetermined shape” of the configuration F is a fold of the first shape having a shape in which the sheet 2 is folded over only one of the plurality of ridges forming the corrugated cardboard wave 10. Fb (hereinafter referred to as "OK fold").

As shown in FIG. 5, the fold F provided in the bellows-shaped cardboard material 1 includes an OK fold Fb, and the sheet 2 has a shape in which the sheet 2 is folded over two or more ridges 27. Two-shaped folds (hereinafter referred to as "NG folds") FBs may also be included.
As shown in FIGS. 6 and 7, in the double-sided corrugated cardboard, a front liner 24 and a back liner 25 are provided with respect to the core 26. The core 26 is a sheet having a plurality of ridges 27 which are continuous in a wavy shape, and forms a wave 10 (see FIG. 1) of double-sided corrugated cardboard.

When the sheet 2 is folded back from the two points P1 on both sides of one mountain 27 in the MD direction as shown in FIG. 6 (a), the sheet 2 straddles only one mountain 27 as shown in FIG. 6 (b). An OK fold Fb having a folded shape is formed.
On the other hand, when the sheet 2 is folded back from the two points P2 on both sides in the MD direction of the two peaks 27 adjacent to each other in the MD direction as shown in FIG. 7 (a), the two sheets 2 are folded back as shown in FIG. 7 (b). An NG fold FB having a shape in which the sheet 2 is folded back over the mountain 27 is formed.

When the sheet 2 is folded back via the folds Fb and FB, either the front liner 24 or the back liner 25 of the sheet 2 faces each other via the folds Fb and FB. In the example shown in FIG. 6 (b), the gap between the facing front liners 24 is smaller than the gap in FIG. 7 (b) around the OK fold Fb. On the other hand, in the example shown in FIG. 7 (b), the gap between the front liners 24 is larger than the gap in FIG. 6 (b) around the NG fold FB.
Therefore, the thickness dimension of the sheets 2 stacked vertically via the OK fold Fb is smaller than the thickness dimension of the sheets 2 stacked vertically via the NG fold FB.

Here, with respect to the dimensions in the height direction of the corrugated cardboard material 1 placed on the horizontal plane, three types of dimensions shown in FIG. 8 are defined. The corrugated cardboard material 1 is a bellows-shaped corrugated cardboard material folded in a rectangular parallelepiped shape.

The dimensions in the height direction specified here are the following three types.
"Height SH of end portion": A dimension in the height direction at each end portion (that is, a corner portion in the corrugated cardboard material 1) in the lateral direction of a pair of side surfaces along the lateral direction and the height direction.
"Height MH of the central portion": A dimension in the height direction in the lateral central portion of a pair of side surfaces along the lateral direction and the height direction.
"Deflection height DH": The difference between the height SH at the end and the height MH at the center.

The heights SH and MH of the end portion and the central portion are dimensions in which the lower surface of the lowermost sheet 2 and the upper surface of the uppermost sheet 2 are vertically separated from each other.
Deflection height DH "deflection" means that the lateral center of a pair of sides along the lateral and height directions is relative to the lateral ends of the pair of sides along the lateral and height directions. It is a deformation that bends in the vertical direction and sinks. The amount of sinking in the vertical direction at this deformed portion is the height of deflection DH.
When the height SH of the end portion is different between one side and the other side in the lateral direction, the difference between the height SH of the end portion having a large dimension and the height MH of the central portion is the deflection height DH. And.

If the corrugated cardboard material 1 has a large deflection, the sheet 2 may be broken due to the deflection. Therefore, if a corrugated cardboard material with a large deflection is used in a box-making system, it may cause various problems such as deterioration of the appearance of a box assembled from the corrugated cardboard material and insufficient assembly accuracy of the box. There is. Therefore, it is desirable to suppress the deflection of the corrugated cardboard material 1.

As the number of OK folds Fb increases, the height SH of the end portion is suppressed, so that the difference between the height SH of the end portion and the height MH of the central portion becomes smaller and the height DH of the deflection is suppressed. NS. On the other hand, as the number of NG fold FBs increases, the height SH of the end portion increases, so that the height SH of the end portion becomes larger than the height MH of the central portion, and the height DH of the deflection becomes larger. Increase.
In the assumed ideal corrugated cardboard material 1, there are no NG folds FB, and all folds F are OK folds Fb. In such a corrugated cardboard material 1, the height SH at the end and the height MH at the center become substantially equal, and the height DH of the deflection disappears or becomes extremely small.

The inventors of the present application have determined that the ratio of OK fold Fb to all folds F in the corrugated cardboard material 1 is equal to or more than a predetermined lower limit ratio and the ratio of NG fold FB is equal to or less than a predetermined upper limit ratio. It was found that the above-mentioned problem VIII tends to be solved if it is within the ratio range. Conversely, it was found that if the ratio of OK fold Fb is smaller than the predetermined lower limit ratio and the ratio of NG fold FB is larger than the predetermined upper limit value, the above-mentioned problem VIII tends to occur. ..
That is, the corrugated cardboard material 1 is provided with the configuration F based on the above-mentioned viewpoint VIII.

The "predetermined lower limit ratio" is 90 [%], preferably 95 [%], and more preferably 99 [%]. The "predetermined upper limit ratio" is 10 [%], preferably 5 [%], and more preferably 1 [%].
The thickness dimension of the cardboard material 1 having the configuration F is not particularly limited, but the thickness dimension is preferably 2.0 [mm] or more and 6.0 [mm] or less, and A flute, B flute and C flute. It is more preferable that it is 3.0 [mm] or more and 5.0 [mm] or less from the viewpoint of including.

In the corrugated cardboard material 1 having the configuration F, it is preferable that the ratio of the height MH of the central portion to the height SH of the end portion is larger than the predetermined height ratio. The predetermined height ratio is 99.0 "%", preferably 99.2 "%", and more preferably 99.4 "%". In other words, the ratio of the deflection height DH to the edge height SH is preferably less than 1.0 "%", more preferably less than 0.8 "%", and more preferably 0.6 "%". It is more preferably less than%. Further, in the corrugated cardboard material 1 having the configuration F, it is preferable that the difference in the height MH of the central portion (that is, the height DH of the deflection) from the height SH of the end portion is less than a predetermined difference. The predetermined difference is 20 [cm], preferably 18 [cm], and more preferably 16 [cm].

<Structure F'>
The configuration F'is, as described above, "the ratio of the fold F of the predetermined shape is within the predetermined second ratio range".
The “predetermined shape fold F” of the configuration F ′ is the NG fold FB described above in the configuration F (a second shape fold having a shape in which the sheet 2 is folded over two or more ridges 27). ).

The inventors of the present application can secure the above-mentioned problem III and suppress the problem VIII if the ratio of the NG fold FB to all the folds F in the cardboard material 1 is within the predetermined second ratio range. We obtained the finding that there is a tendency. Conversely, it was found that if the NG fold FB is outside the predetermined second ratio range, at least one of Task III and Task VIII tends to occur.
That is, the corrugated cardboard material 1 is provided with the configuration F'based on the above-mentioned viewpoints III and VIII.

When the ratio of the NG fold FB to all the folds F is larger than the predetermined second ratio range, the height SH of the end portion of the corrugated cardboard material 1 becomes large, and the height of the deflection of the corrugated cardboard material 1 DH. Tends to increase (leading to Challenge VIII above).
In that case, as described above in the configuration F, the sheet 2 is likely to be broken due to the deflection, the appearance of the box assembled from the cardboard material is deteriorated, and the assembly accuracy of the box is insufficient. It may lead to various problems such as.

Further, in the corrugated cardboard material 1, if the stacked sheets 2 are in close contact with each other too much, the amount of air between the sheets 2 is reduced, and the sheets 2 may be difficult to separate from each other. In that case, when the sheet 2 is unwound in the feed process of the box-making system, 2 [sheets] are simultaneously lifted and unfolded without being sufficiently unfolded (“double feeding”). be. When the sheet 2 is double-fed, the sheet is not satisfactorily fed out from the cardboard material 1, and the paper feed stability tends to be impaired (the feedability is lowered, which causes the above-mentioned problem III).
Therefore, if the ratio of the NG fold FB to all the folds F is smaller than the predetermined second ratio range, the sheets 2 are more likely to adhere to each other although the deflection is suppressed, so that the sheets from the cardboard material 1 are good. It tends to lead to the above-mentioned problem III without being delivered to.

Therefore, in the corrugated cardboard material 1 having the configuration F'that "the ratio of the fold F of the predetermined shape is within the predetermined second ratio range", it is possible to both secure the problem III and suppress the problem VIII. ..
In the "predetermined second ratio range", the ratio of NG fold FB to all folds F is 0.5 [%] or more and 13.0 [%] or less, and 3.5 [%] or more. It is preferably 11.5 [%] or less, and more preferably 7.5 [%] or more and 11.5 [%] or less.

Further, the higher the flexibility of the core constituting the corrugated cardboard material 1, the easier it is to fold the corrugated cardboard material 1, and the NG fold FB tends to be less likely to occur. Conversely, the harder the core, the more difficult it is to fold the corrugated cardboard material 1, and the more likely it is that NG folds FB will occur.
One of the factors that affect the hardness of the core is the fiber length of the base paper (core base paper) used for the core and the runkel ratio of the core base paper.

The fiber length of the core base paper is a parameter corresponding to the average value of the lengths (fiber lengths) of the pulp fibers constituting the core base paper.
When the value of the fiber length of the core base paper is large, the pulp fibers tend to be entangled with each other, and a hard core tends to be obtained. When the value of the fiber length of the core base paper is small, the pulp fibers are less likely to be entangled with each other, and the flexibility of the core tends to increase.
The fiber length of the core base paper used for the core in the corrugated cardboard material 1 having the configuration F'is 0.75 [mm] or more, 1.35 [mm] or less, and 0.85 [mm] or more. It is preferably 1.25 [mm] or less, and more preferably 1.00 [mm] or more and 1.20 [mm] or less.

The runkel ratio is a parameter indicating the shape of the pulp fibers constituting the core base paper.
When the value of the runkel ratio of the core base paper is small, the flexibility of the fiber is increased, and a supple core tends to be obtained. When the value of the runkel ratio of the core base paper is large, the rigidity of the fiber increases and the core tends to be hard.
The runkel ratio of the core base paper used for the core in the corrugated cardboard material 1 having the configuration F'is 0.9 or more and 1.3 or less, and 1.0 or more and 1.2 or less. More preferred.

In addition, the larger the basis weight of the core base paper, the harder the core, and the more likely it is that NG creases FB will occur. Further, the larger the basis weight of the liner base paper used for the liner constituting the corrugated cardboard material 1, the more rigid the liner becomes, the more difficult it is to fold the corrugated cardboard material 1, and the more likely the NG fold FB tends to occur.
The basis weight of the core base paper used for the core in the corrugated cardboard material 1 having the configuration F'is preferably 110 [g / m ² ] or more and 200 [g / m ² ] or less, and the configuration F'is defined. The basis weight of the liner base paper used for the liner in the corrugated cardboard material 1 to be provided is preferably 110 [g / m ² ] or more and 270 [g / m ² ] or less.

Further, the thickness dimension of the corrugated cardboard material 1 having the configuration F'is not particularly limited, but from the viewpoint of including A flute, B flute, C flute and E flute, and a double flute combining any two types of flutes. It is more preferably 5 [mm] or more and 10.0 [mm] or less.

<Others>
By the way, in the assumed ideal corrugated cardboard material 1, there are no folds F in a defective state, and all the positions of the folds F coincide with the reference position BS. However, almost all of the actual corrugated cardboard material 1 has creases F in a defective state, and defective portions such as the positions of the folds F vary.

Therefore, an ideal configuration that cannot exist in the actual corrugated cardboard material 1 may be excluded from the above configurations A to E. For example, a lower limit value such as 0.1 [%] may be set for a predetermined ratio of the configuration A, or a lower limit value such as 1 [mm] or 2 [mm] may be set for the separation dimension BD of the configuration B. ..
In addition, in places where the fold F is crushed or the intersection angle θ is equal to or greater than a predetermined intersection angle, it may be impossible to measure the polymerization dimension CL, the interval DI, and the like. When such an unmeasurable part exists, parameters such as the polymerization dimension CL and the interval DI are measured at the part excluding the unmeasurable part (that is, all the measurable parts).

[3. Action and effect]
By providing the corrugated cardboard material 1 of the present embodiment at least one of the above-mentioned configurations A to F', it is possible to secure the box-making property when it is used as a box-making material.
According to the configuration A, since the defective fold F is equal to or less than a predetermined ratio, the fold F is included in the appearance of the box assembled from the corrugated cardboard material 1 cut out by the cut line straddling the fold F. Even so, it is possible to suppress the occurrence of a fold line corresponding to the fold FA in addition to the fold F. Therefore, the appearance of the box can be ensured (solving the above-mentioned problem I), and the strength of the box can be ensured (solving the above-mentioned problem II).

According to this configuration A, it is possible to suppress a defect when the corrugated cardboard material 1 is fed out. Specifically, it is possible to suppress clogging of the corrugated cardboard material that is delivered in the feed process in the box making system. In this way, it is possible to secure the feedability of the corrugated cardboard material to be manufactured (solve the above-mentioned problem III).

Even with the configuration B, since the variation in the position of the fold F is within the predetermined position range, it is possible to suppress a defect when the corrugated cardboard material 1 is unwound, and the feedability of the corrugated cardboard material to be boxed is ensured ( The above-mentioned problem III can be solved).
Further, according to the configuration B, since the protrusion of the crease F in the corrugated cardboard material 1 is suppressed, it is possible to prevent the film packaging the corrugated cardboard material 1 from being damaged by the crease F (solving the above-mentioned problem IV). can.

By suppressing the breakage of the film, the exposure of the fold F is also suppressed. This makes it possible to improve the safety of the cardboard material 1 for the handler (solve the above-mentioned problem V). As a result, it is possible to suppress the load collapse of the corrugated cardboard material 1, and it is also possible to suppress stains such as wetting (risk of water ingress) and dirt. By suppressing the load collapse, the stability of the corrugated cardboard material 1 can be ensured (solving the above-mentioned problem VI).
In addition, according to the configuration B, the variation in the lateral position of the fold F is suppressed, so that the fold F is prevented from being crushed by colliding with another object during the transporting action or the installation work of the corrugated cardboard material 1. be able to. In this way, it is possible to suppress the appearance defect of the corrugated cardboard material 1.

According to the configuration C, since the lower limit value is set in the thickness magnification range of the polymerization dimension CL with respect to the reference dimension TS, the crease is formed in the box assembled from the corrugated cardboard material 1 cut out by the cut line straddling the crease F. It is possible to secure the strength of the portion corresponding to F (solve the above-mentioned problem II). If the thickness magnification is smaller than the lower limit of the predetermined thickness magnification range, the stress on the crease F is excessively concentrated, and the strength of the portion corresponding to the crease F becomes insufficient in the manufactured box. It is presumed that there is a risk.
Further, according to the configuration C, since the upper limit value is set in the predetermined thickness magnification range, the gap S is less likely to be generated around the crease F, so that a defect when the corrugated cardboard material 1 is unwound can be suppressed. Can be done. Therefore, it is possible to secure the feedability of the corrugated cardboard material to be manufactured (solve the above-mentioned problem III).

According to this configuration C, since the lower limit value of the predetermined thickness magnification range is set, the sharpness of the crease F in the corrugated cardboard material 1 is suppressed, so that the film packaging the corrugated cardboard material 1 is damaged by the crease F. Can be suppressed (solving the above-mentioned problem IV).
By suppressing the breakage of the film, the exposure of the fold F is also suppressed. This makes it possible to improve the safety of the cardboard material 1 for the handler (solve the above-mentioned problem V). As a result, it is possible to suppress the load collapse of the corrugated cardboard material 1, and it is also possible to suppress stains such as wetting (risk of water ingress) and dirt. By suppressing the load collapse, the stability of the corrugated cardboard material 1 can be ensured (solving the above-mentioned problem VI).

According to the configuration D, since the interval DI of the fold F is within a predetermined distance magnification range with respect to the reference dimension TS, the gap S is less likely to occur around the fold F, so that the cardboard material 1 is fed out. It is possible to suppress problems when the cardboard is used. Therefore, it is possible to secure the feedability of the corrugated cardboard material to be manufactured (solve the above-mentioned problem III).
According to this configuration D, since the variation DI in the interval DI between the folds F is suppressed, the polymerization state of the sheet 2 is stable (the cargo is stable). Therefore, the stability of the placed corrugated cardboard material 1 can be ensured (solving the above-mentioned problem VI). Therefore, even if the corrugated cardboard material 1 is not wrapped with a film, it is possible to suppress the load collapse of the corrugated cardboard material 1 and improve the safety for the operator of the corrugated cardboard material 1 (solving the above-mentioned problem V). be able to.

According to the configuration E, the _{intersection angle θ formed by the first} end edge E 1 and the second end edge E ₂ of the seat pair 20 is less than a predetermined intersection angle, so that the positions of the end _{edges E 1} and E _{2 are located.} Variations are suppressed. Therefore, it is possible to suppress a defect when the corrugated cardboard material 1 is unwound, and to secure the feedability of the corrugated cardboard material to be manufactured (solve the above-mentioned problem III).
Further, by stabilizing the polymerization state of the sheet 2 (stable cargo), the stability of the placed corrugated cardboard material 1 can be ensured (solving the above-mentioned problem VI). As a result, even if the corrugated cardboard material 1 is not wrapped with a film, it is possible to prevent the corrugated cardboard material 1 from collapsing. Therefore, it is possible to improve the safety of the cardboard material 1 for the handler (solve the above-mentioned problem V).

According to this configuration E, it is possible to suppress a defect of being folded at a place other than a desired ruled line in the folding process of the box-making system, and it is also possible to improve the box-making accuracy. Thereby, the strength of the box can be secured (the above-mentioned problem II can be solved).
In addition, according to the corrugated cardboard box using the corrugated cardboard material 1, the same action and effect as the corrugated cardboard material can be obtained.

According to the configuration F, the OK fold Fb straddles only one mountain 27 and the sheet 2 has a folded shape, so that the dimension of the height SH of the end portion of the placed corrugated cardboard material 1 can be increased. It can be suppressed (solving the above-mentioned problem VIII). Then, when the ratio of the OK fold Fb to all the folds F in the cardboard material 1 is equal to or more than the predetermined lower limit ratio and the ratio of the NG fold FB is equal to or less than the predetermined upper limit ratio, the deflection of the cardboard material 1 is increased. It is possible to remarkably suppress the occurrence.

According to the configuration F', the ratio of the NG fold FB to all the folds F in the corrugated cardboard material 1 is within a predetermined second ratio range, so that the occurrence of deflection in the corrugated cardboard material 1 is suppressed (the above-mentioned problem VIII). (Solution) and ensuring the feedability of the corrugated cardboard material in the box-making system (solving the above-mentioned problem III) can be compatible with each other.

[II. Example]
Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. However, the present invention is not limited to the following examples.
In this item [II], items common to the examples and comparative examples of the configurations A to F'(partly excluding the configuration F') are described in the item [1], and the implementation corresponding to each of the configurations A to F is carried out. An example and a comparative example will be described in item [2]. Further, an example in which three configurations of the configurations A to F'are combined will be described in item [3].

[1. Common subject matter]
--Measurement target--
In the examples and comparative examples of the configurations A to F (excluding the configuration F'), the configurations common to the corrugated cardboard materials (hereinafter referred to as "measurement cardboard materials") for which the parameters are measured will be described.
The corrugated cardboard material to be measured is a double-sided corrugated cardboard sheet for A flute.

The measurement corrugated cardboard materials of configurations A to F (excluding configuration F') consist of the following base papers and have the following sizes.
-Core base paper: 160 [g / m ² ] [S160: manufactured by Oji Materia Co., Ltd.]
-Liner base paper: 170 [g / m ² ] [OFK170: manufactured by Oji Materia Co., Ltd.]
・ Size: Vertical dimension 1300 [mm],
Horizontal dimension 1150 [mm],
Height dimension 1800 [mm]

Further, the corrugated cardboard materials having the configurations A to F'are produced by using a corrugated cardboard having a stepping roll having the specifications shown below.
・ Step height: 4.5 [mm]
・ Number of steps: 34 steps [mountain / 30 cm]
The "step height" is the height of the step in the sheet of the corrugated cardboard material to be measured, and is a dimension corresponding to the amplitude of the wave. The "number of steps" is the number of peaks (steps) per 30 [cm] on the sheet, and corresponds to a value obtained by dividing 30 [cm] by the wavelength of the wavefront.

The measurement corrugated cardboard material or a part thereof, which is the measurement target of the parameters, was subjected to a treatment of adjusting the humidity for 24 [hours] in an RH environment with a temperature of 23 [° C.] and a humidity of 50 [%]. This process is referred to as "pre-processing" in the following description.
In addition, a commonly used one-tank type starch paste was used as the adhesive for corrugated cardboard to bond the liner base paper and the core base paper.

--evaluation--
Each of the examples and comparative examples, which will be described in detail later in the next item [2], was evaluated on a four-point scale of “◎”, “○”, “△”, and “×”. In the configurations A to F, the highest evaluation “⊚” and the next highest evaluation “◯” were regarded as good evaluations. On the other hand, "x" with the lowest evaluation and "Δ" with the next lowest evaluation were regarded as poor evaluations. In the configuration F', "Δ" and above were evaluated as good, and "x" was evaluated as poor.

[2. Configuration A to F']
<Structure A>
--Measurement target--
In Examples A1 to A3 and Comparative Examples A4 and A5 relating to the configuration A, the amount of voids in the stationary measurement cardboard material was compared. Specifically, 101 [stages] in the middle stage of the corrugated cardboard material to be measured was set as the measurement target. That is, the middle section where the sheets are adjacent to each other at 100 [locations] in the height direction was measured.

The "void" is a space existing in a range of 15 [mm] along the horizontal direction (MD direction) from the folded end of the sheet in the measurement cardboard material, and is an area viewed from the vertical direction (hereinafter, "gap"). The side area) is 25 [mm ² ] or more.

The voids were determined by the procedures Aa to Ae shown below.
-Procedure Aa: In the measured corrugated cardboard material, the folded end of the sheet and its surroundings
Observe the presence or absence of space in.
-Procedure Ab: A 10 [mm] square standard piece of paper is attached to the corrugated cardboard material near the gap.
Take a picture so that both the void and the standard piece of paper fit in.
-Procedure Ac: Enlarge and print the photograph taken in Procedure Ab, and use scissors to insert standard paper pieces and gaps.
cut out.
-Procedure Ad: Pretreat the cut sample and weigh the pretreated sample.
NS.
-Procedure Ae: From the weight ratio, assuming that the side area (flat area) of the standard test piece is 100 [mm ^2].
Calculate the side area of the void.

For example, a right-angled triangular space having two sides of 11 [mm] and 10 [mm] excluding the hypotenuse when viewed from the vertical direction has a side area of 55 [mm ² ] and is 15 from the folded end of the sheet. If it exists in the range of [mm], it is judged to be a void.
The points to be observed in the above procedure Aa are the following points Ac.
-Location Ac: All (4 [locations]) corners of the measured corrugated cardboard material, that is, the total number of locations observed in the location Ac is 400 [locations] (4 [locations] x 100 [locations]).

Then, in Examples A1 to A3 and Comparative Examples A4 and A5, the corrugated cardboard materials for measuring the porosity shown in Table 3 below were used.
The "porosity" corresponds to the "predetermined ratio" of one embodiment and is the ratio at which voids exist between the stacked sheets. Specifically, the porosity is a percentage of "the number of places where voids exist" with respect to "the number of all measurement points", and was calculated by the following formula AI.
Porosity = number of places where voids exist / number of all measurement points ... Equation AI

--evaluation--
The box-making properties of the measured corrugated cardboard materials of Examples A1 to A3 and Comparative Examples A4 and A5 were evaluated.
The "box-making property" here refers to the accuracy of a box in which cardboard pieces (hereinafter referred to as "evaluation cardboard pieces") cut out by a cut line straddling the folds of the measured corrugated cardboard material are assembled by hand (handmade). It is an evaluation standard corresponding to the quality of the cardboard. As a manual assembly method, the cut corrugated cardboard piece was folded at a predetermined ruled line, attached with a hot melt adhesive, and boxed.
The method of assembling the evaluation cardboard pieces by the box-making system is the same regardless of whether the evaluation cardboard pieces are assembled by hand or by the box-making system. Therefore, it is presumed that the box-making property of the evaluation cardboard piece assembled by hand has a correlation with the box-making property of the evaluation cardboard piece assembled by the box-making system.

The "evaluation cardboard piece" is a test piece in which the measurement cardboard material is punched into the following shape and size with a sample cutter (CF2-1218 manufactured by Mimaki Engineering Co., Ltd.).
-Shape: Pattern in which the A-type cardboard box is developed-Size: Width dimension of the side plate of the A-type cardboard box 356 [mm],
Width dimension of the end plate of the A type cardboard box 159 [mm],
Height dimension of A type cardboard box 256 [mm]
・ Number of sheets: 100 [sheets]

The above evaluation cardboard pieces were evaluated according to the following criteria.
-⊚: All (100 [sheets]) evaluation cardboard pieces have good box-making properties.
-○: Evaluation of 100 [sheets] Of the cardboard pieces, 1 to 2 [sheets] have poor box-making properties.
-Δ: Evaluation of 100 [sheets] 3 [sheets] of the corrugated cardboard pieces have poor box-making properties.
-X: Evaluation of 100 [sheets] Of the cardboard pieces, 4 [sheets] or more are poor in box-making property.

The term "good box-making property" as used herein means that the distance dimension between the following folded portions A and B in the evaluated corrugated cardboard piece is less than the predetermined distance dimension.
-Folded part A: A part where a ruled line for box making (an element different from the crease) is provided.

The "predetermined distance dimension" is 2.0 [mm] for the dimension in the direction perpendicular to the crease of the evaluation cardboard piece (MD direction), and the dimension in the direction parallel to the crease (CD direction). Is 5 [mm].
On the other hand, "poor box-making property" means that the distance dimension between the folded portions A and B in the evaluated corrugated cardboard piece is equal to or larger than the predetermined distance dimension.

In Examples A1 to A3 having a porosity of 10 [%] or less, good box-making property was obtained. Among them, in Example A1 having a porosity of 2 [%] or less, excellent box-making property was obtained.
On the other hand, in Comparative Examples A4 and A5 in which the porosity was larger than 10 [%], poor box-making property was obtained. Among them, in Comparative Example A5 in which the porosity was larger than 14 [%], particularly poor box-making property was obtained.
From the evaluation results of Examples A1 to A3 and Comparative Examples A4 and A5, the evaluation corrugated cardboard pieces cut out from the measurement corrugated cardboard material having a void ratio of 10 [%] or less can suppress the distance dimension between the folded portions A and B. It can be seen that box-making property is ensured.

<Structure B>
--Measurement target--
In Examples B1 to B3 and Comparative Examples B4 and B5 relating to the configuration B, the variation in the position of the crease (hereinafter referred to as “end face deviation”) in the stationary measurement corrugated cardboard material was compared. The measurement corrugated cardboard material according to Examples B1 to B3 and Comparative Examples B4 and B5 has 360 [stages].
The “end surface deviation” is the distance at which the creases of the measured corrugated cardboard material are displaced in the horizontal direction (MD direction) when viewed from the vertical direction (CD direction).

The deviation of the end face was measured by the procedures Ba to Be shown below.
-Procedure Ba: Measure 330 [stages] of the measured corrugated cardboard material, excluding 30 [stages] from the top.
It is a fixed target.
-Procedure Bb: Draw a reference line with a marker on the corrugated cardboard material to be measured in step Bb.
This reference line corresponds to the above-mentioned reference position BS in one embodiment, and is from the lateral direction.
Observe and make a vertical line that passes through the most recessed part in the vertical direction.
-Procedure Bc: The corrugated cardboard material to be measured in procedure Bb is divided into three parts, upper, middle and lower.
, About each of the 20 [stages] where the deviation is the largest in each part
Then, the distance from the reference line in the lateral direction is measured. "Reference line" here
The "distance separated from the lateral direction" corresponds to the "distance dimension BD" of one embodiment.
do.
-Procedure Bd: A disturbance that reduces the accuracy of the measurement result from the distance measured in the procedure Bc (required)
Exclude numerical values that can be (cause) (so to speak, those with a large distance).
-Procedure Be: The maximum value of each distance excluding some measurement results in procedure Bd is the end face.
It will be misaligned.

In step Bd, "Exclusion of numerical values that can cause disturbance", when the deviation of the end face measured in all stages of the measured corrugated cardboard material is used as the population, the value whose standard deviation of the population deviates from ± 3σ is excluded. NS.
Then, in Examples B1 to B3 and Comparative Examples B4 and B5, the corrugated cardboard materials for measuring the deviation of the end faces shown in Table 4 below were used.

--evaluation--
The measurement corrugated cardboard materials of Examples B1 to B3 and Comparative Examples B4 and B5 were wrapped in a film, and the tearing of the film was evaluated.
As the film used in this evaluation, a stretch film of the following product and size was used.
・ Product: Super Telite Slim (manufactured by Tsukasa)
-Size: Width dimension 500 [mm],
Length dimension 500 [mm]

The above film was wound around the measurement cardboard material in the following procedure Be, and the film tear was observed in the following procedures Bf and Bg.
-Procedure Be: Each part of procedure Bc is manually wound around the same place for three laps.
-Procedure Bf: After 10 minutes from the implementation of Procedure Be, the film is peeled off from the measurement cardboard material.
Then, the presence or absence of tearing of the film was visually confirmed.

The presence or absence of film tear was evaluated according to the following criteria.
・ ◎: No tear is observed in the film.
-○: A tear of 1 [mm] or more is observed only in the first layer from the inside of the film.
-Δ: A tear of 1 [mm] or more is observed in the first and second layers from the inner layer of the film.
-X: A tear of 1 [mm] or more is observed in all three layers of the film.

In Examples B1 to B3 in which the deviation of the end face was less than 50 [mm], a good evaluation that the film was not easily torn was obtained. Among them, in Example B1 in which the deviation of the end face was less than 15 [mm], the film was not torn, and a good evaluation was obtained.
On the other hand, in Comparative Examples B4 and B5 in which the deviation of the end face was 50 [mm] or more, a poor evaluation that the film was easily torn was obtained. Among them, in Comparative Example B5 in which the deviation of the end face was 60 [mm] or more, a particularly poor evaluation was obtained.
From the evaluation results of Examples B1 to B3 and Comparative Examples B4 and B5, it can be seen that the measurement corrugated cardboard material having an empty end surface deviation of less than 50 [mm] suppresses the damage of the film packaging the measurement corrugated cardboard material.

<Structure C>
--Measurement target--
In Examples C1 to C3 and Comparative Examples C4 and C5 relating to the configuration C, the thickness ratios of the sheets in the measured corrugated cardboard material that had been allowed to stand were compared. Specifically, 101 [stages] in the middle stage of the corrugated cardboard material to be measured was set as the measurement target. That is, the middle section where the sheets are adjacent to each other at 100 [locations] in the height direction was measured.

The "thickness magnification" as used herein means, as described above in one embodiment, a sheet thickness that is vertically overlapped with respect to a reference sheet thickness (referred to as "reference dimension TS" as in one embodiment) (one embodiment). It is a magnification of (referred to as "polymerization dimension CL") as in the form. That is, the thickness magnification is calculated by the following formula C.
Thickness magnification = Polymerization dimension CL / Reference dimension TS ... Formula C
The polymerization dimension CL is a thickness dimension of a pair of sheets that are continuous through the fold at a portion folded back by 5 [mm] in the lateral direction from the fold. The reference dimension TS is the thickness dimension of the sheet 2 per sheet.

The thickness magnification was calculated by the above formula C by measuring the reference dimension TS and the polymerization dimension CL and using the measured reference dimension TS and the polymerization dimension CL.
The reference dimension TS was measured by the following procedures Ca and Cb.
・ Procedure Ca: Select a part of the corrugated cardboard material that is not crushed and make it 10 [cm] square.
It was cut out and pretreated.
-Procedure Cb: After pretreatment with procedure Ca, measure the thickness of each sheet with a ruler, and measure the result.
The average value of the fruits was taken as the reference dimension TS.

The polymerization dimension CL was measured by the following procedures Cc to Cf.
-Procedure Cc: The entire measurement cardboard material is pretreated in the same manner as in procedure Ca.
-Procedure Cd: After pretreatment in procedure Cc, all in the measured corrugated cardboard material (4 [locations]]
), The polymerization dimension CL was measured with a ruler. That is, 400 [locations]
Measure the polymerization dimension CL at each of (4 [locations] x 100 [locations]).
..
-Procedure Ce: Decrease the accuracy of the measurement result from the polymerization dimension CL measured in the procedure Cd.
Exclude numerical values that can cause disturbance (factor).
-Procedure Cf: Maximum value and maximum of polymerization dimension CL excluding some measurement results in procedure Ce
From the small value, the maximum value and the minimum value of the thickness magnification were calculated by the above formula C.

In the procedure Ce, "Exclusion of numerical values that can cause disturbance", as in the above procedure Bd, when the polymerization dimension CL measured in all stages of the measured corrugated cardboard material is used as the population, the standard of the population is used. Values whose deviation deviates from ± 3σ are excluded.
Then, in Examples C1 to C3 and Comparative Examples C4 and C5, the corrugated cardboard materials for measuring the thickness magnification shown in Table 5 below were used.

--evaluation--
The transportability of the measured corrugated cardboard materials of Examples C1 to C3 and Comparative Examples C4 and C5 was evaluated.
The term "transportability" as used herein is an evaluation standard corresponding to the quality and stability of the measured corrugated cardboard material when it is conveyed.

The transportability was evaluated based on the deviation of the measured corrugated cardboard material obtained by the transport test by carrying out a transport test on the measured corrugated cardboard material (so to speak, bare measurement corrugated cardboard material) not wrapped in a film.
The transfer test was carried out under the following conditions.
-Loading conditions: Place on a transport pallet.
・ Transportation conditions: Transport 10m at a speed of 15km with a forklift (manufactured by Toyota, gene B)
(Transport).
The deviation of the measured corrugated cardboard material corresponds to the degree of load collapse of the measured corrugated cardboard material, and is the distance at which the measured corrugated cardboard material is displaced before and after the transfer test (hereinafter referred to as “deviation distance”).

The above transportability was evaluated according to the following criteria.
-⊚: The deviation distance is less than 25 [mm].
◯: The deviation distance is 25 [mm] or more and less than 50 [mm].
-Δ: The deviation distance is 50 [mm] or more and less than 100 [mm].
-X: The deviation distance is 100 [mm] or more. Or, the measurement cardboard material completely collapses.
Break it.

In Examples C1 to C3 in which the thickness ratio was 1.0 [times] or more and less than 3.0 [times], good evaluation of transportability was obtained. Among them, in Example C3 in which the thickness ratio was 1.5 [times] or more and less than 2.0 [times], excellent transportability was evaluated.
On the other hand, in Comparative Example C4 containing a thickness magnification of less than 1.0 [times] and Comparative Example C5 containing a thickness magnification of 3.0 [times] or more, an evaluation of poor transportability was obtained.
According to the evaluation results of Examples C1 to C3 and Comparative Examples C4 and C5, the measured corrugated cardboard material having a thickness magnification of 1.0 [times] or more and less than 3.0 [times] was transported. It can be seen that the deviation distance is suppressed and the transportability is ensured.

<Structure D>
--Measurement target--
In Examples D1 to D3 and Comparative Examples D4 and D5 regarding the configuration D, the magnifications of the intervals between the folds in the stationary measurement cardboard material were compared. Specifically, 101 [stages] in the middle stage of the corrugated cardboard material to be measured was set as the measurement target. That is, the upper portions where the sheets are adjacent to each other at 100 [locations] in the height direction were measured.

The "magnification of the interval" as used herein means, as described above in one embodiment, the interval between creases with respect to the reference sheet thickness (referred to as "reference dimension TS" as in one embodiment) (one implementation). It is a magnification of (referred to as "interval DI") as in the form. That is, the magnification of the interval is calculated by the following formula D.
Magnification of interval = interval DI / reference dimension TS ... Equation D

The magnification of the interval was calculated by the above formula D by measuring the reference dimension TS and the interval DI and using the measured reference dimension TS and the interval DI. The reference dimension TS was measured by the same procedure as the above-mentioned procedures Ca and Cb. The interval DI was measured by the following procedures Da to Dd.
-Procedure Da: Similar to the above-mentioned procedure Cc, the entire measurement cardboard material is pretreated.
-Procedure Db: Similar to the above-mentioned procedure Cd, the entire measurement cardboard material is pretreated by procedure Da.
After that, the interval D at all (4 [locations]) corners of the measured corrugated cardboard material.
Measure I with a ruler.
-Procedure Dc: As in the above-mentioned procedure Ce, the measurement result is obtained from the interval DI measured in the procedure Db.
Exclude numerical values that can be a disturbance (factor) that reduces the accuracy of the fruit.
-Procedure Dd: Maximum and minimum values of interval DI for which some measurement results were excluded in procedure Dc.
Therefore, the maximum value and the minimum value of the magnification of the interval were calculated by the above formula D.

In the "exclusion of numerical values that can cause disturbance" in the procedure Dc, the interval DI measured in all stages of the measured corrugated cardboard material is used as the population as in the above-mentioned procedures Bd and Ce. Then, for the larger value of the interval DI, the value whose population standard deviation deviates from ± 4σ is excluded. For smaller values of the interval DI, values whose population standard deviation deviates from ± 3σ are excluded.
Then, in Examples D1 to D3 and Comparative Examples D4 and D5, the corrugated cardboard materials for measuring the magnification of the intervals shown in Table 6 below were used.

--evaluation--
The uprightness of the measured corrugated cardboard materials of Examples D1 to D3 and Comparative Examples D4 and D5 was evaluated.
The term "uprightness" as used herein is an evaluation standard corresponding to the quality of the fixed form and stability when an impact is applied to the measured corrugated cardboard material.

The uprightness was evaluated based on the deviation of the measured corrugated cardboard material obtained by the collision test after performing a collision test on the measured corrugated cardboard material not wrapped in the film.
In the collision test, a 10 kg sandbag (using a length 61 [cm] x width 46.5 [cm]) was made to collide with a portion 1000 [mm] from the bottom of the corrugated cardboard material at a speed of 24 km / h. ..
The deviation of the measured corrugated cardboard material corresponds to the degree of load collapse of the measured corrugated cardboard material, and is the distance at which the measured corrugated cardboard material is displaced before and after the transfer test (hereinafter referred to as “deviation distance”). The deviation distance is the distance at which the folds of the measured corrugated cardboard material are displaced in the vertical direction (CD direction) when viewed from the horizontal direction (MD direction) on the end face provided with the creases.

The "deviation distance" referred to here is measured by the following procedures Xa to Xd.
-Procedure Xa: Of the corrugated cardboard material to be measured, the part excluding 30 [stages] from the top is the measurement target.
do.
-Procedure Xb: Draw a reference line with a marker on the corrugated cardboard material to be measured in procedure Xa.
This reference line is drawn on the extending surface of the fold perpendicular to the ground.
-Procedure Xc: Collision with the central part of the step height of the measured corrugated cardboard material measured in procedure Xa.
A crash test will be conducted as a location. After that, it separates from the reference line in the CD direction.
Measure the distance.
-Procedure Xd: The maximum value of the procedure Xc is set as the deviation distance.
The above-mentioned deviation distance measuring procedure is incorporated into the deviation distance measuring procedure measured in the transfer test according to the configuration C.

The above-mentioned uprightness was evaluated by the following criteria as well as the transportability.
-⊚: The deviation distance is less than 25 [mm].
◯: The deviation distance is 25 [mm] or more and less than 50 [mm].
-Δ: The deviation distance is 50 [mm] or more and less than 100 [mm].
-X: The deviation distance is 100 [mm] or more. Or, the measurement cardboard material completely collapses.
Break it.

In Examples D1 to D3 in which the magnification of the interval was 1.0 [times] or more and less than 3.0 [times], good evaluation of uprightness was obtained. Among them, in Example D3 in which the magnification of the interval was 1.5 [times] or more and less than 2.5 [times], an excellent evaluation of uprightness was obtained.
On the other hand, in Comparative Example D4 containing a magnification of an interval of less than 1.0 [times] and Comparative Example D5 including a magnification of an interval of 3.0 [times] or more, an evaluation of poor uprightness was obtained.
According to the evaluation results of Examples D1 to D3 and Comparative Examples D4 and D5, the measurement cardboard material having an interval magnification of 1.0 [times] or more and less than 3.0 [times] is displaced due to collision. It can be seen that the distance is suppressed and the uprightness is ensured.

<Structure E>
--Measurement target--
In Examples E1 to E3 and Comparative Examples E4 and E5 regarding the configuration E, the crossing angles of the edges of the sheets in the stationary measurement cardboard material were compared. Specifically, one of the 101 [stages] in the middle stage of the corrugated cardboard material to be measured was measured in the vertical direction (CD direction). That is, the middle section where the sheets are adjacent to each other at 100 [locations] in the height direction was measured.

As described above, the “intersection angle” as used herein refers to the edge of one of the sheets that are continuous through the fold (“first end edge E _{1” as in one embodiment.} ”) And the edge of the other sheet (referred to as“ second edge E ₂ ”as in one embodiment).
This crossing angle was measured by the following procedures Ea to Ee.
-Procedure Ea: When the measurement cardboard material is viewed from the height direction (TD direction), the first end edge E ₁ and the first
Use a ruler to determine the maximum value of the distance that the two-end edge E _{2 is displaced in the vertical direction (CD direction).}
Measure.
-Procedure Eb: The measurement cardboard material has edges E ₁ and E _{2 when viewed from the height direction (TD direction).}
Define a virtual triangle. Specifically, the first end edge E ₁ and the second end edge E ₂
Opposite side corresponding to the maximum value of the distance between and in the vertical direction (CD direction)
A triangle having a so-called misalignment distance) and an adjacent side corresponding to the lateral dimension of the sheet.
Think of the shape as a right triangle.
-Procedure Ec: The horizontal dimension of the measured corrugated cardboard material (here, 1150 [mm]) and procedure Ea
From the measured length of the opposite side, intersect using the three-square theorem and trigonometric functions
Calculate the angle.
-Procedure Ed: From the intersection angle measured in the procedure Ec, in the same manner as the above-mentioned procedures Bd and Ce,
Exclude numerical values that may cause disturbances (factors) that reduce the accuracy of measurement results.
-Procedure Ee: The crossing angle is the maximum value in the numerical value excluding some measurement results in the procedure Ed.
And.

To give an example of procedure Ec, when the length of the opposite side is 5.4 [mm], the length of the adjacent side is 1150 [mm], so the calculated intersection angle is 0.27 [°]. ].
In the "exclusion of numerical values that can cause disturbance" in the procedure Ed, as in the above procedure Bd and Ce, when the crossing angles measured at all stages of the measured corrugated cardboard material are used as the population, the population of the population is used. Values whose standard deviation deviates from ± 3σ are excluded.
Then, in Examples E1 to E3 and Comparative Examples E4 and E5, the corrugated cardboard material for measuring the crossing angle shown in Table 7 below was used.

--evaluation--
The paper feed stability was evaluated for the measured corrugated cardboard materials of Examples E1 to E3 and Comparative Examples E4 and E5.
The "paper feed stability" referred to here is a standard corresponding to the quality of the feeding stability of the measured corrugated cardboard material in the feed process of the box making system.
For paper feed stability, 100 sheets of measured cardboard material are applied to CMC's carton wrap (box making system), and the number of machine stops due to sheet clogging in the feed process of feeding out the measured cardboard material sheets is counted. Evaluated.

The above paper feed stability was evaluated according to the following criteria.
-⊚: The number of stops is 0 [times].
-○: The number of stops is 1 [times] or 2 [times].
-Δ: The number of stops is 3 [times].
-X: The number of stops is 4 [times] or more.

In Examples E1 to E3 in which the crossing angle was less than 0.3 [°], good evaluation of paper feed stability was obtained. Among them, in Example E1 having an intersection angle of 0.05 [°] or less, an excellent evaluation of paper feed stability was obtained.
On the other hand, in Comparative Examples C4 and C5 having an intersection angle of 0.3 [°] or more, poor paper feed stability was evaluated.
From the evaluation results of Examples E1 to E3 and Comparative Examples E4 and E5, according to the measured corrugated cardboard material having an intersection angle of less than 0.3 [°], the machine stop due to the sheet clogging of the box making system is suppressed, and the paper is fed. It can be seen that stability is ensured.

<Structure F>
--Measurement target--
In Examples F1 to F3 and Comparative Examples F4 and F5 regarding the configuration F, the measurement cardboard material is a single flute. The sheet of the measurement cardboard material is pretreated for 24 hours or more under the temperature and humidity conditions of temperature 23 [° C.] and humidity 50 [%] in accordance with JIS Z0203: 2000, and the cardboard industry standard T0004: 2000. The thickness dimension measured according to the above is 4 [mm].

In addition, the total number of corrugated cardboard sheets folded in the measured corrugated cardboard material is 360. In each of the lowermost stage and the uppermost stage of the corrugated cardboard material, there is no crease on one side in the lateral direction (MD direction). Therefore, the number of folds existing in the measured corrugated cardboard material is 179 on one side in the lateral direction and 180 on the other side in the lateral direction, which is 359.

In Examples F1 to F3 and Comparative Examples F4 and F5 relating to the configuration F, the bellows-shaped measurement cardboard material folded in a rectangular parallelepiped shape extends in the height direction on a pair of side surfaces along both the vertical direction and the height direction. Examine the shape of 359 existing folds. Specifically, the shapes of the folds were classified into the following two types, and the number of each shape was counted.
-First shape: A shape in which the sheet is folded back across only one mountain (OK fold shape)
-Second shape: The shape of the sheet folded over two or more mountains (the shape of the NG fold)

Then, in Examples F1 to F3 and Comparative Examples F4 and F5, a corrugated cardboard material for measuring the number of folds of the first shape and the number of folds of the second shape as shown in Table 8 below was used.
Examples F1 to F3 and Comparative Examples F4 and F5 have folds having a predetermined shape in a shape ratio as shown in Table 8 below.
The shape ratio is a percentage of the number of folds of the first shape to the total number of folds in the measured corrugated cardboard material, and was calculated by the following formula FI.
Shape ratio = number of folds of the first shape / number of all folds ... Formula FI

Further, in Examples F1 to F3 and Comparative Examples F4 and F5 regarding the configuration F, the amount of voids in the measured corrugated cardboard material was compared. Here, the "void" is measured by the same method as in the above-described embodiment with respect to the configuration A, and the description of the measurement method and the like will be omitted.
Then, in Examples F1 to F3 and Comparative Examples F4 and F5, the corrugated cardboard materials for measuring the porosity shown in Table 8 below were used. Here, when the side area of the gap ^{is less than 25 [mm 2} ], the shape of the fold may be the first shape, and when the side area of the gap is 25 [mm ² ] or more, the shape may be the second shape. all right. Therefore, the height of the deflection of the central portion of the measured corrugated cardboard material can also be evaluated by the above-mentioned porosity.

--evaluation--
The height of the deflection at the center of the measured corrugated cardboard materials of Examples F1 to F3 and Comparative Examples F4 and F5 was evaluated.
(Measuring method of deflection height in the center)
The height of the deflection at the central portion was measured by the procedures Fa to Fd shown below. The central portion referred to here is a position of 650 [mm] from the end of the vertical dimension of 1300 [mm].
-Procedure Fa: Place one precision weight in the center of the top of the measurement cardboard material. Precision
Copper is made by Murakami Kouki Co., Ltd. and is made of cylindrical stainless steel and weighs 1 [kg].
It is a precision weight. The cylindrical surface of the precision weight is in contact with the corrugated cardboard material to be measured.
It is placed in the center of the horizontal dimension of 1150 [mm] so as to be. At this time, the edge of the horizontal dimension
To fit the precision weight in the range of 545 [mm] to 605 [mm]
do. In addition, the cylindrical surface of the other two precision weights is in contact with the cardboard material.
Place them on both ends of the horizontal dimension of 1150 [mm] so as to do so. At this time,
Range from 0 [mm] to 60 [mm] and 1090 [mm] to 1090 [mm] from the edge of the horizontal dimension
Make sure that each precision weight fits within the range of 1150 [mm].
-Procedure Fb: From the center of the bottom of the measurement cardboard material to the center of the deflection of the top
Up to, measure using a tape measure. The tape measure is made by Yamayo Measuring Machine Co., Ltd.
No .: VR50K was used.
-Procedure Fc: From the position of the vertical dimension 0 [mm] (bottom surface) at the bottom of the measured corrugated cardboard material, the most
Measure using a tape measure up to the position of the upper vertical dimension 0 [mm] (upper surface).
The same measurement was performed from the position of the vertical dimension of 1300 [mm], and both in the vertical direction.
Obtain height A and height B of the side end, respectively.
-Procedure Fd: The height of the deflection at the center was determined by the following formula FII.
Deflection height = {(edge height A + B) / 2} -center height ... Equation FII

From the above-mentioned deflection height of the central portion, the ratio of the deflection height of the central portion to the maximum height of the central portion is calculated using the following formula FIII.
The maximum height of the central portion corresponds to the height dimension (1800 [mm]) of the measured corrugated cardboard material. In terms of the percentage of deflection height, the third decimal place is rounded off.
Deflection height ratio = Deflection height ÷ Maximum height at the center x 100 ... Equation FIII

The height of the deflection at the central portion (denoted as "length" in Table 8) obtained in the procedure Fd was evaluated according to the following criteria.
-⊚: The height of the deflection is 0 [cm] or more and less than 10 [cm].
◯: The height of the deflection is 10 [cm] or more and less than 20 [cm].
-Δ: The height of the deflection is 20 [cm] or more and less than 30 [cm].
-X: The height of deflection is 30 [cm] or more.

Among all the folds existing in the corrugated cardboard material, when the crease of the first shape is 90 [%] or more and the fold of the second shape is 10 [%] or less (porosity is 10 [%]). In the following cases), it was found that the height of the deflection in the central part was small. Furthermore, it was also found that the actual use of the measured corrugated cardboard material in the box-making system is unlikely to cause any problems. When the number of folds of the second shape exceeds 10 [%] (porosity exceeds 10%) among the total number of folds existing in the corrugated cardboard material, it is found that the height of the deflection at the central portion is large. rice field. Furthermore, it was also found that the actual use of the measured corrugated cardboard material in the box-making system is likely to cause problems.

In the above embodiment regarding the configuration F, the case where the corrugated cardboard material to be measured is an A flute is taken as an example. The thickness of the corrugated cardboard material to be measured is not limited to the A flute, but the B flute or the C flute, or the single flute, it is presumed that the same result as in the above embodiment can be obtained.

<Structure F'>
--Measurement target--
First, the configurations of the measured corrugated cardboard materials of Examples F11 to F23 and Comparative Examples F24 to F28 regarding the configuration F'will be described.
Any one of the following flutes was used as the measurement cardboard material of Examples F11 to F23 and Comparative Examples F24 to F28.
-A flute: Examples F11 to F20, F23, Comparative Examples F24 to F28
-E flute: Example F21
AB Flute: Example F22

For the front liner and the back liner of Examples F11 to F23 and Comparative Examples F24 to F28, any one of the following product numbers "No. 1" to "No. 4" was used as the liner base paper.
・ No. 1: Examples F11 to F16, F19 to F23, Comparative Examples F24 to F26,
F28
・ No. 2: Example F17
・ No. 3: Example F18
・ No. 4: Example F27

Specifically, the liner base paper of the product numbers "No. 1" to "No. 4" is one of the following four types.
・ No. 1: Basis weight 170 [g / m ² ], product name "OFK-EM170"
・ No. 2: Basis weight 120 [g / m ² ], product name "OFK-EM120"
・ No. 3: Basis weight 210 [g / m ² ], product name "OFK-EM210"
・ No. 4: Basis weight 280 [g / m ² ], product name "OFK-EM280"
All of the above four types of core base paper are manufactured by Oji Materia Co., Ltd.

For each of the cores of Examples F11 to F23 and Comparative Examples F24 to F28, one of the following product numbers "No. 5" to "No. 10" was used as the core base paper.
・ No. 5: Examples F11 to F16, F18, F21 to F23, Comparative Example F24,
F25, F27
・ No. 6: Example F17
・ No. 7: Example F19
・ No. 8: Example F20
・ No. 9: Comparative example F26
・ No. 10: Comparative Example F28

One of the following three types of basis weight was adopted for the core base paper of the product numbers "No. 5" to "No. 10".
Basis weight 160 [g / m ² ]: No. 5, No. 7-9
Basis weight 120 [g / m ² ]: No. 6
Basis weight 210 [g / m ² ]: No. 10

The core base papers of product numbers "No. 5" to "No. 10" were prepared by the following production methods.
The core base paper of product number "No. 5" is made from the following stepped waste paper pulp and the following miscellaneous waste paper pulp, and is made by papermaking using a paper machine (single-layer papermaking on-top type former). It was prepared as a core base paper having a basis weight of 160 [g / m ^{2] composed of the following papermaking conditions.}
-Papermaking conditions for product number "No. 5"> Mixing ratio: 85 [mass%] of used paper pulp and 15 [mass%] of miscellaneous used paper pulp
Mix together

-Stepped recycled paper pulp: Pulp slurry with a concentration of 3 [%] made of stepped recycled paper (cardboard recycled paper)
After careful selection on the screen, free with a double disc refiner
Adjusted so that the ness is 400 [ml] -Miscellaneous waste paper pulp: Pulp slurry with a concentration of 3 [%] consisting of miscellaneous waste paper is refined on the screen.
After selection, the freeness is 350 [ml] with the double disc refiner.
], The freeness was measured with the following measuring device in accordance with JIS P 8121 2012.
・ Measuring device: Product name "Canadian Standard Freeness", Kumagai Riki Kogyo Co., Ltd.
Company, product number "No. 2580-A"

The core base paper of product number "No. 6" was prepared by the same production method as the core base paper of "No. 5" except ^{that the basis weight was changed to 120 [g / m 2].}
The core base paper of product number "No. 7" is the core base paper of "No. 5" except that 40 [mass%] of stepped waste paper pulp and 60 [mass%] of miscellaneous waste paper pulp are mixed. It was created in the same way as.
The core base paper of product number "No. 8" is the core base paper of "No. 5" except that 90 [mass%] of stepped waste paper pulp and 10 [mass%] of miscellaneous waste paper pulp are mixed. It was created in the same way as.

The core base paper of product number "No. 9" is made from the following coniferous kraft pulp and the following stepped waste paper pulp, and is made by papermaking using a paper machine (single-layer papermaking on-top type former). It was prepared as a core base paper having a basis weight of 160 [g / m ^{2] composed of the following papermaking conditions.}
-Paper-making conditions for product number "No. 9"> Size agent: Drug name "Size Pine N-836 (manufactured by Arakawa Chemical Industry Co., Ltd.)"
0.3 [mass] for a total of 100 [mass] of total pulp in the paper layer
Add in [Part]> Paper strength enhancer: Drug name "PT-1001 (Arakawa Chemical Industry Co., Ltd.)" for all pulp in the paper layer
Add 0.5 [parts by mass] to a total of 100 [parts by mass] of
Add> Mixing ratio: 94 [mass%] of softwood kraft pulp and 9 [mass] of stepped recycled paper pulp
%] And mix

-Coniferous kraft pulp: Pulps with a concentration of 3 [%] consisting of softwood kraft pulp
After carefully selecting the rally on the screen, double disc refinement
Adjust so that the freeness is 400 [ml] with a ner.
・ Stepped waste paper pulp: The freeness that is the same as the above-mentioned stepped waste paper pulp in the product number “No. 5” is the same as the above-mentioned freeness in the product number “No. 5”.
The core base paper of product number "No. 10" was produced by the same production method as the core base paper of "No. 5" except ^{that the basis weight was changed to 210 [g / m 2].}

The following sizes 1 or 2 were used as the measurement cardboard materials of Examples F11 to F23 and Comparative Examples F24 to F28, respectively. The size of the measurement cardboard material is determined by the vertical dimension (dimension L1 in the CD direction in FIG. 1), the horizontal dimension (dimension L2 in the MD direction in FIG. 1), and the height dimension (dimension L3 in the TD direction in FIG. 1).
・ Size 1: Vertical direction 1300 [mm]
Lateral direction 1150 [mm]
Height direction 1800 [mm]
-Size 2: Vertical direction 650 [mm]
Horizontal direction 400 [mm]
Height direction 900 [mm]

Further, the total number of layers of the corrugated cardboard sheets folded in each of the measurement corrugated cardboard materials of Examples F11 to F23 and Comparative Examples F24 to F28 is 360, and as described above in the configuration F, the folds existing in the measurement corrugated cardboard material. The number of eyes is 179 on one side in the horizontal direction and 180 on the other side in the horizontal direction, which is 359.
In Examples F11 to F23 and Comparative Examples F24 to F28, similarly to the configuration F, the height of the bellows-shaped measurement cardboard material folded in a rectangular parallelepiped shape is set on a pair of side surfaces along both the vertical direction and the height direction. Examine the shape of 359 folds extending in the direction. Specifically, the shapes of the folds were classified into the following two types, and the number of each shape was counted.
-First shape: A shape in which the sheet is folded back across only one mountain (OK fold shape)
-Second shape: The shape of the sheet folded over two or more mountains (the shape of the NG fold)

Then, in Examples F11 to F23 and Comparative Examples F24 to F28, corrugated cardboard materials for measuring the number of folds of the first shape and the number of folds of the second shape as shown in Tables 9 to 11 below were used. ..
In Examples F11 to F23 and Comparative Examples F24 to F28, the creases of the first shape and the folds of the second shape are divided into shape ratios (first shape ratio, second shape ratio) as shown in Tables 9 to 11 below. ).
The first shape ratio is a percentage of the number of folds (OK folds) of the first shape with respect to the total number of folds in the measured corrugated cardboard material, and was calculated by the above-mentioned formula FI in the configuration F.
The second shape ratio is a percentage of the number of folds (NG folds) of the second shape with respect to the total number of folds in the measured corrugated cardboard material, and was calculated by the following formula FI'.
Second shape ratio = number of folds of the second shape / number of all folds ... Equation FI'

Further, in the core base papers constituting the measurement corrugated cardboard materials of Examples F11 to F23 and Comparative Examples F24 to F28, the average length fiber length and the runkel ratio shown in Tables 9 to 11 below were measured.
The runkel ratio is a parameter indicating the shape of the pulp fibers constituting the core base paper, and is calculated by (runkel ratio) = (twice the fiber wall thickness) / (fiber lumen diameter). The larger the runkel ratio, the more rigid the fiber.
The average length fiber length is an average value of the lengths (fiber lengths) of the pulp fibers constituting the core base paper. The average fiber length of the core base papers of Examples F11 to F23 and Comparative Examples F24 to F28 was adjusted using the following surface fiber classifier (MAX-F700, manufactured by Aikawa Iron Works Co., Ltd.).

The runkel ratio and the average length fiber length were measured by the following procedures F1 to F5.
Step F1: Cut out the second step from the top of the corrugated cardboard material into 40 [cm] squares, and that 40
A [cm] square cardboard sheet was used for measurement. The cutout position is Danbo
It was in the middle of the width of the seat. Then, put the cardboard sheet in ion-exchanged water.
Immerse in water for 15 minutes and remove from ion-exchanged water.
Step F2: Each of the core base papers from the cardboard sheet taken out in step F1 is cored.
Separate from the liner base paper by peeling it off by hand so that the base paper does not tear.
Step F3: The core base paper separated in step F2 is immersed in ion-exchanged water to a concentration of 2 ± 0.2 [%].
], And soaked for 24 hours.
Step F4: After immersing the core base paper whose density has been adjusted according to Step F3 for 24 hours, standard type disassembly
Dissociate for 20 minutes using a machine (manufactured by Kumagai Riki Kogyo Co., Ltd.) to separate the pulp into fibers.
I understand.
Step F5: The slurry (pulp fiber) after disintegration is separated in step F4, and the following fiber length measurement is performed.
Using the machine, runkel ratio and JIS P 8226-2: 2011
The average fiber length was measured.
-Fiber length measuring machine: Part number FS-5 UHD base unit, manufactured by Valmet

--evaluation--
With respect to the measured corrugated cardboard materials of Examples F11 to F23 and Comparative Examples F24 to F28, the height of the deflection at the central portion and the feedability were evaluated.
The height of the deflection at the central portion was measured in the same procedure as the procedures Fa to Fd described above in the configuration F. The central portion referred to here is a position of 650 [mm] from the end of the vertical dimension of 1300 [mm] in the measurement cardboard material of size 1. In the measurement cardboard material of size 2, the position is 325 [mm] from the end of the vertical dimension 650 [mm].

From the above-mentioned deflection height of the central portion, the ratio of the deflection height of the central portion to the maximum height of the central portion is calculated by using the above-mentioned formula FIII in the configuration F.
The maximum height of the central part corresponds to the height dimension of this measured corrugated cardboard material. Specifically, it is 1800 [mm] for the size 1 measurement cardboard material and 900 [mm] for the size 2 measurement cardboard material.
The height of the deflection at the central portion (denoted as “length” in Tables 9 to 11) was evaluated in the configuration F using the same criteria as those described above.

"Feedability" is an evaluation standard corresponding to the quality of paper feed stability in a box-making system.
Regarding the feedability, when the measured corrugated cardboard materials of Examples F11 to F23 and Comparative Examples F24 to F28 are applied to the following box-making system and the box is manufactured under the following manufacturing conditions (box-making speed). Measurement Evaluation was made based on whether or not the sheet was satisfactorily extended from the corrugated cardboard material and whether or not the box-making system was stopped (also referred to as "machine stop").
Box making system: CMC, product name "CMC Carton Wrap 1000"
Box making speed: 500 [box per hour]
It was visually confirmed whether or not the above-mentioned sheet was fed out satisfactorily and whether or not the machine was stopped.

This feedability was evaluated according to the following criteria.
・ ◎: Only 1 [sheet] is held when the sheet is drawn out from the measurement cardboard material.
No folds other than the creases of the bellows folds have occurred.
・ ○: 1 [sheet] sheet and subsequent sheet when feeding out the sheet from the measured corrugated cardboard material
An event occurs in which 2 [sheets] of the sheet are lifted at the same time, but a snake
No folds other than the belly folds occur, and no machine stop occurs.
・ △: 1 [sheet] sheet and subsequent sheet when feeding out the sheet from the measured corrugated cardboard material
Two [sheets] of the sheet are lifted at the same time, and after the crease of the bellows fold
The outside breaks, but the machine does not stop. Here, "Folds other than creases occur
"To do" means an unexpected break in a place that is not originally broken, such as the center of the seat.
Is to occur. If an unexpected break occurs, it will be made into a cardboard box.
In this state, the box may break unexpectedly and the strength of the box may decrease.
・ ×: 1 [sheet] sheet and subsequent sheet when feeding out the sheet from the measured corrugated cardboard material
Two [sheets] of the sheet are lifted at the same time, and after the crease of the bellows fold
An outer fold occurs, and the machine stops due to the fold that occurs.

In Examples F11 to F23, the second shape ratio is 0.5 [%] or more and 13.0 [%] or less, and both the height of the deflection at the central portion and the feedability are “Δ” or more. A good evaluation was obtained.
Among Examples F11 to F23, in Examples F12 to F15, F17 to F19, and F21 to F23 in which the second shape ratio is 3.5 [%] or more and 11.5 [%] or less, the central portion. A better evaluation of "○" or higher was obtained in terms of both the height of deflection and the feedability.

On the other hand, in Comparative Examples F24 to F28, the second shape ratio was larger than 13.0 [%], and a poor evaluation of “x” was obtained at least in the height of the deflection at the central portion.
Among Comparative Examples F24 to F28, Comparative Example F25 in which the fiber length of the core base paper is 1.6 [mm] and Comparative Example F27 in which ^{the basis weight of the core base paper is 280 [g / m 2] are centered.} A poor evaluation of "x" was obtained in terms of both the height of the deflection of the part and the feedability.

When the second shape ratio is 0.5 [%] or more and 13.0 [%] or less, the dimension in the height direction on a pair of side surfaces along both the vertical direction and the height direction of the measured corrugated cardboard material. It is presumed that the amount of air is less likely to increase, the deflection of the central part is suppressed, and the adhesion between the sheets stacked with the measurement cardboard material is suppressed, so that air can sufficiently enter between each other and it becomes difficult for the sheets to be double-fed. ..
Therefore, when the second shape ratio is 0.5 [%] or more and 13.0 [%] or less, it can be said that it is possible to suppress the deflection generated in the central portion and secure the feedability at the same time. ..
In particular, when the ratio of the second shape is 3.5 [%] or more and 11.5 [%] or less, it can be said that both prevention of deflection occurring in the central portion and improvement of feedability can be achieved at the same time.

From Examples F11 to F16 and Comparative Examples F24 and F25, in which the flute and size of the corrugated cardboard material, the basis weight of the liner base paper, and the basis weight and product number of the core base paper are the same, and the fiber lengths of the core base paper are different from each other. It can be seen that the smaller the fiber length value of the core base paper, the smaller the second shape ratio, and the larger the fiber length value of the core base paper, the larger the second shape ratio.
In view of Comparative Examples F24 and F25, from Examples F11 to F16, when the fiber length of the core base paper is 0.75 [mm] or more and 1.35 [mm] or less, the core has appropriate flexibility. It can be said that the ratio of the second shape becomes smaller because NG creases are less likely to occur.
On the other hand, if the fiber length of the core base paper exceeds 1.35 [mm], the core becomes too hard and NG creases are likely to occur, and it can be said that the ratio of the second shape becomes large.

From Example F19, F20 and Comparative Example F26, in which the flute and size of the corrugated cardboard material, the basis weight of the liner base paper, and the basis weight and fiber length of the core base paper are common, and the runkel ratios of the core base paper are different from each other. It can be seen that the smaller the value of the Runkel ratio, the smaller the ratio of the second shape, and the larger the value of the Runkel ratio, the larger the ratio of the second shape.
In view of Comparative Example F26, from Examples F19 and F20, when the runkel ratio of the core base paper is 0.9 or more and 1.3 or less, the core has appropriate flexibility and the NG fold. Is less likely to occur, and it can be said that the ratio of the second shape becomes smaller.
On the other hand, if the runkel ratio of the core base paper is 0.9 or less, it is presumed that the flexibility of the fibers increases, the flexibility of the core increases too much, NG creases are likely to occur, and the ratio of the second shape increases. NS.
Further, when the runkel ratio of the core base paper exceeds 1.3, the rigidity of the fibers increases, the core becomes too hard, NG creases are likely to occur, and the ratio of the second shape increases.

In addition, in view of Comparative Examples F27 and F28, if the second shape ratio is 0.5 [%] or more and 13.0 [%] or less from Examples F11 to F23, the fiber length of the core base paper Is 0.75 [mm] or more and 1.35 [mm], the Runkel ratio is 0.9 or more and 1.3 or less, and the basis weight range of the core base paper of the measured cardboard material. If the basis weight range of the liner base paper of the front liner and the back liner is the following range, the second shape ratio tends to be 0.5 [%] or more and 13.0 [%] or less. I can say.
・ Basis weight range of core base paper: 110 [g / m ² ] or more and 200 [g / m ² ] or less ・ Basis weight range of liner base paper: 110 [g / m ² ] or more and 270 [g / m ² ] or less

In Comparative Example F28 in which the basis weight of the core base paper is 210 [g / m ² ], the core base paper becomes too hard and NG creases are likely to occur, the deflection generated in the central portion is not suppressed, and the feed It is presumed that the sex cannot be secured.
In Comparative Example F27 in which the basis weight of the liner base paper is 280 [g / m ² ], the liner becomes too hard and difficult to fold, and NG creases are likely to occur, and the deflection generated in the central portion is not suppressed. Moreover, it is presumed that the feedability cannot be ensured.

In Example f11 in which the ratio of the height of the deflection in the central portion is 0.22 [%], the dimension in the third direction at the ends in the first direction and the second direction is relative to the dimension in the third direction in the central portion in the second direction. The ratio of dimensions corresponds to 99.78 [%].
Example f20 in which the ratio of the height of the deflection in the central portion is 1.50 [%] is the third direction in the central portion in the second direction with respect to the dimension in the third direction at the ends in the first direction and the second direction. The ratio of dimensions corresponds to 98.5 [%].
In Comparative Example f24 in which the ratio of the height of the deflection in the central portion is 1.83 [%], the dimension in the third direction at the ends in the first direction and the second direction is relative to the dimension in the third direction in the central portion in the second direction. The ratio of dimensions corresponds to 98.17 [%].
In view of Comparative Example f24, from Examples f11 and f20, the ratio of the dimension in the third direction in the central portion of the second direction to the dimension in the third direction at the ends in the first direction and the second direction is 98.5 [%]. ] Or more and 99.8 [%] or less, it can be said that it is possible to suppress the deflection generated in the central portion and secure the feedability at the same time.

In view of Comparative Example f24 in which the height of the deflection in the central portion is 33 [cm], the height of the deflection in the central portion is 4 [cm] in Example f11 and the height of the deflection in the central portion is 27 [cm]. From Example f20, the difference between the dimensions of the third direction at the ends of the first direction and the second direction and the dimensions of the third direction at the center of the second direction is greater than 3 [cm] and less than 30 [cm]. If this is the case, it can be said that it is possible to suppress the deflection generated in the central portion and secure the feedability at the same time.

In addition, from Examples F11 to F23, if the second shape ratio is 0.5 [%] or more and 13.0 [%] or less, the flute of the corrugated cardboard material to be measured is that of A flute, E flute and AB flute. In any case, regardless of the size of the corrugated cardboard material to be measured, it can be said that it is possible to suppress the deflection generated in the central portion and secure the feedability at the same time.
In Example F22 of AB flute (double flute), the seat is stiffer than in Example F14 of A flute (single flute), and it can be said that the height of deflection tends to be slightly suppressed.
It can be said that in the E-flute Example F22, the sheet is thinner and more flexible than in the A-flute Example F14, so that the height of the deflection tends to increase slightly.

[3. Example of combining the three configurations]
Finally, an embodiment BCF'combining configurations B, C and F'will be described.
The details of the measurement target and evaluation of Example BCF'are the same as those described above unless otherwise specified.
--Measurement target--
Example BCF'was evaluated for a measurement corrugated cardboard material having the parameters listed below.
・ End face deviation: 10 [mm]
-Thickness magnification: Maximum 1.9 [times], minimum 1.8 [times]
-Second shape ratio: 8.0 [%]

--evaluation--
Measurement of Example BCF'The tearing, transportability, deflection of the central portion, and feedability of the film were evaluated for the corrugated cardboard material. As a result, good evaluations were obtained in all of the film tearing, transportability, deflection at the center, and feedability (above "○" or higher).
From the evaluation results of Example BCF', it can be seen that when the configurations B, C, and F'are combined, the evaluations corresponding to the respective configurations B, C, and F'are excellent without being impaired.
Furthermore, it is presumed that the quality of the measured corrugated cardboard material is stable because of its excellent box-making property, film tearing and transportability. As a result, it is presumed that the dimensions of the assembled box are less likely to vary from the designed dimensions, and the dimensional stability of the box is improved.

[III. Modification example]
The above-described embodiment is merely an example, and there is no intention of excluding the application of various modifications and techniques not specified in this embodiment. Each configuration of the present embodiment can be variously modified and implemented without departing from the gist thereof. In addition, it can be selected as needed and can be combined as appropriate.
For example, when the corrugated cardboard material is a material for a box-making system, it is preferable that no additional processing such as intentionally formed cuts or perforations is applied to the surface layer of the liner in the corrugated cardboard material. It is preferable that the crease is a portion that is folded back by 180 [°] from the provided ruled line as the starting point (for example, the ruled line is inside). On the other hand, when the corrugated cardboard material is a material other than that used for the box making system, processing such as cuts and perforations may be applied to the creases.

The use of the bellows-folded corrugated cardboard material described above is not limited to the use as a box-making material applied to a box-making system.
There are various ways to utilize the bellows-folded corrugated cardboard material, which is different from the conventional single-wafered corrugated cardboard sheet, and makes use of the structure in which a plurality of sheets are continuously provided through folds.
For example, the bellows-folded corrugated cardboard material can be treated as a web-like paper material having a large dimension in the extending direction in the unfolded state of the sheet.

As a method of using it as a web-like paper material, for example, the following uses can be mentioned as an example.
Use as a disaster product: By attaching it to a window, it can be used to prevent window cracking during a typhoon.
In addition, privacy protection and stress reduction at evacuation shelters
Use as a reduction partition, cushioning material and cold
It can be used as a countermeasure rug.
Use at event events: Can be used for creations such as signboards for events and school events
NS.
Use as a building / moving material: Temporarily open doors, walls, doors, etc. at construction sites and moving sites
If you need to protect it, stick it on the object
It can be used as a protective material (curing material). Wrap around the object
Can be used as a protective material (packaging material) that can be attached
You can also do it.

The liner base paper and core base paper used for the above-mentioned corrugated cardboard material and measurement cardboard material are not limited to the products having the product numbers mentioned in the examples, and the liner base paper produced by the method for manufacturing a corrugated board liner of Japanese Patent No. 6213364 and JP-A-2017. A core base paper produced by the method for producing a corrugated board base paper of Japanese Patent Application Laid-Open No. -218721 may be used.

1 Cardboard material 10 Waves 2 Sheets 20 Sheets vs. 21 1st sheet 22 2nd sheet 23 3rd sheet 24 Front liner 25 Back liner 26 Core 27 Mountains E ₁ 1st edge E ₂ 2nd edge F Fold F1 1st fold F2 2nd fold FA fold BS reference position BL separation dimension CL polymerization dimension DI interval TS reference dimension LP predetermined dimension L1 vertical dimension (first dimension)
L2 horizontal dimension (second dimension)
L3 height dimension (third dimension)
S Void θ Crossing angle SH Edge height MF Central center height DH Deflection height

Claims (5)

In a continuous cardboard, a rectangular sheet is folded back in a second direction orthogonal to the first direction on a plane along the fold at each of the folds extending linearly along the first direction, and the first. A bellows-folded cardboard material in which the sheets are stacked along a third direction in a direction orthogonal to both the direction and the second direction and along the vertical direction.
The dimension in the first direction is 650 [mm] or more and 1300 [mm] or less.
The dimension in the second direction is 400 [mm] or more and 1150 [mm] or less.
The dimension in the third direction is 900 [mm] or more and 1800 [mm] or less.
The plurality of folds include a first-shaped fold in which the sheet is folded over only one of the plurality of ridges forming the corrugated cardboard wave, and two or more ridges. The sheet includes a second-shaped crease having a folded shape across the sheet.
Of all of the folds, the ratio of the folds of the second shape 3.5% or more in a 11.5 [%] Ri der below,
It is a parameter corresponding to the length of the pulp fibers constituting the core base paper used for the corrugated cardboard, and the average length fiber length measured in accordance with JIS P 8226-2: 2011 is 0.75 [mm]. It is more than 1.35 [mm] or less, and is
The Runkeru ratio is a parameter indicating the shape of the pulp fibers, cardboard material, wherein 1.3 der Rukoto hereinafter be 0.9 or more that constitute the in corrugating. The basis weight of the core base paper used for the cardboard is 110 [g / m ² ] or more and 200 [g / m ² ] or less.
The corrugated cardboard material according to claim 1, wherein the liner base paper used for the corrugated cardboard has a basis weight of 110 [g / m ² ] or more and 270 [g / m ² ] or less. The ratio of the dimension in the third direction in the central portion of the second direction to the dimension in the third direction at the ends of the first direction and the second direction is 98.5 [%] or more and 99.8. [%] The cardboard material according to claim 1 or 2 , wherein the material is not more than or equal to [%]. The difference between the dimensions of the third direction at the ends of the first direction and the second direction and the dimensions of the third direction at the center of the second direction is greater than 3 [cm] and less than 30 [cm]. The cardboard material according to any one of claims 1 to 3, wherein the cardboard material is provided. A corrugated cardboard box using the corrugated cardboard material according to any one of claims 1 to 4.

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