JP2003300266A - Corrugating medium for corrugated cardboard material, corrugated cardboard sheet, manufacturing method for corrugating medium for corrugated cardboard material, and manufacturing method for corrugated cardboard sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a corrugated cardboard sheet having high strength without bringing about complication of a process or increasing the number of processes. <P>SOLUTION: The corrugated cardboard sheet 10 has a corrugating medium 12 for the corrugated cardboard sheet, which is formed of a sheetlike material and characterized in that the height of corrugations of a corrugated shape is 4.6-4.8 mm, the number of ridges per 30 cm is 34±0.5, each of ridges and troughs is formed of a circular arc and R2-R1 is 0.38 mm or less when the circular arc of each ridge is set to R1 and that of each trough is set to R2, and the liner 11 arranged to at least the single surface of the corrugating medium 12 for the corrugated cardboard material. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial corrugated board sheet, an industrial corrugated board sheet, a core used for the corrugated board sheet, an apparatus for manufacturing the corrugated board and a corrugated board sheet, and particularly for producing a high strength corrugated board sheet. It is related to the technology of.

[0002]

2. Description of the Related Art The characteristic of a corrugated cardboard box made of corrugated cardboard sheets is their high strength as compared with the lightness of the box itself. The strength of the cardboard box depends on the strength of the core and liner used. In order to increase the strength of the center core and the liner, it is possible to adopt a means such as increasing the thickness of these cores or making them multi-layered. Also, for example, Japanese Patent Publication No. 47-17354.
In several proposals including JP-A No. 51-631791, a method of impregnating a core raw paper with a thermosetting resin to strengthen the core paper has been tried.
Japanese Patent Publication No. 55-7141 and Japanese Examined Patent Publication No. 55-7141 use corrugated core raw paper to obtain a corrugated board sheet with increased strength. However, in order to obtain a resin-impregnated core or a bonded core, the steps are complicated or the number of steps is increased. Therefore, it is desired to obtain a high-strength corrugated board sheet without causing such a complicated process or an increase in the number of processes.

To address such a problem, Japanese Patent Laid-Open No. 9-15
In No. 6002, in a multi-layer or multi-layer corrugated board in which at least two or more cores and at least three or more liners are molded and adhered, at least one corrugation has a wave height of 5.5 mm or more and the number of corrugations. A high-strength corrugated cardboard sheet having a value of 20 (per 30 cm) or more has been proposed.

[0004]

However, Japanese Patent Laid-Open No. 9-
Since the wave height of 156002 is as high as 5.5 mm or more,
Not suitable for some applications. Therefore, it is an object of the present invention to obtain a corrugated board sheet which is thinner than that of JP-A-9-156002 and which does not complicate the process or increase the number of processes.

[0005]

[Means for Solving the Problems] Corrugated sheets having a wave height of 4.6 to 4.8 are used for corrugated cardboard sheets used for packaging boxes and the like.
For the A flute (column) of mm, the number of terraces is 30
There was a standard corridor with 35.1 mountains per cm and an economy corridor with 32.9 mountains per 30 cm. The present invention was conducted to solve the above-mentioned problems with the A flute as a target. As a result, the wave height of the wavy shape was 4.6 to 4.8 mm and the number of peaks per 30 cm was 34 ± 0.5. It is a mountain and the mountain and the valley are formed by one arc, and when the arc of the mountain is R1 and the arc of the valley is R2, it is effective to use a center core with R2-R1 of 0.38 mm or less. It was discovered that

Therefore, the present invention is formed of a sheet-shaped material, and the wave height of the wavy shape is 4.6 to 4.8 mm and 3
The number of peaks per 0 cm is 34 ± 0.5, and the peaks and valleys are formed by one arc, and when the arc of the peak is R1 and the arc of the valley is R2, R2-R1 is 0.5.
Provided is a corrugated fiberboard core having a diameter of 38 mm or less.

The present invention also provides a corrugated board sheet using the above core for corrugated board material. This corrugated cardboard sheet is formed of a sheet-shaped material, has a wave height of 4.6 to 4.8 mm, and a number of peaks per 30 cm of 34 ±.
When the number of ridges is 0.5, and the ridges and valleys are formed by one arc, and the arc of the ridges is R1 and the arc of the ridges is R2, R2-R1 is a core for corrugated board material of 0.38 mm or less. And a liner provided on at least one surface of the corrugated board core. In the corrugated board sheet of the present invention, the liner can be arranged only on one side of the corrugated board core or on both sides of the corrugated board core. Further, the corrugated board sheet of the present invention can be applied to a so-called double-sided corrugated board sheet. This double-sided double-faced corrugated sheet has a form in which it is combined with a corrugated cardboard sheet having a corrugated cardboard core different in wave height and number of peaks from the corrugated cardboard core. Further, this double-sided double-faced corrugated sheet can also be combined with a corrugated cardboard sheet having a corrugated board core in which the wave height and the number of peaks of the corrugated shape are the same as those of the corrugated board core.

In the corrugated board sheet of the present invention, the corrugated board core may be used as a single layer, or a plurality of corrugated cores may be used. In other words, the corrugated cardboard sheet of the present invention has a corrugated wave height of 4.6 to 4.8 mm,
The number of peaks per cm is 34 ± 0.5, and the peaks and valleys are formed by one arc, and when the arc of the peak is R1 and the arc of the valley is R2, R2-R1 is 0.5. Three
A plurality of cores of 8 mm or less can be laminated. Here, there are two forms of stacking. One is a form in which the cores are overlapped so that they come into contact with each other as shown in FIG. 4, and the other one is a top portion (or a valley portion) as shown in FIG.
It is a form in which they are associated with each other.

The corrugated board sheet of the present invention can be laminated with a core having a different shape. That is, in the present invention, the wave height of the wavy shape is 4.6 to 4.8 mm, the number of peaks per 30 cm is 34 ± 0.5, and the peaks and valleys are formed by one arc, and the peaks are formed. Let R1 be the arc of R1 and R2 be the arc of the valley, and R2-R1 is the first core having a radius of 0.38 mm or less and the second core in which the wave height and the number of peaks per 30 cm are different from those of the first core. It is also possible to use a corrugated cardboard sheet in which cores are laminated.

The present invention provides an apparatus for producing a corrugated core for forming a predetermined corrugated core by pressure-feeding a sheet material between a pair of stepped rolls that mesh with each other. In this device, the stepped roll includes a cylindrical roll main body and a corrugated corrugated portion formed on an outer peripheral portion of the roll main body, and the corrugated portion has a wave height of 4.6 to 4.
8 mm, the number of peaks per 30 cm is 34 ± 0.5, and the peaks and valleys are formed by one arc, and when the arc of the peak is R1 and the arc of the valley is R2, R2
-R1 is characterized by being 0.38 mm or less. The present invention also provides a pair of stepped rolls that form a predetermined corrugated core by pressure-feeding a sheet material, and a gluing roll that transfers a paste solution to the top of the core formed by the stepped rolls. And a pressure-bonding roll that pressure-bonds the core and the liner glued by the gluing roll. In this apparatus, the stepped roll includes a cylindrical roll main body and a corrugated corrugated portion formed on an outer peripheral portion of the roll main body, and a wave height of the corrugated portion is 4.6 to 4.8 m.
The number of peaks per m, 30 cm is 34 ± 0.5, and the peaks and valleys are formed by one arc, and
If the arc of the mountain is R1 and the arc of the valley is R2, then R2-R1
Is 0.38 mm or less.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, a corrugated board sheet according to the present embodiment will be described, and then an apparatus for manufacturing the corrugated board sheet will be described. FIG. 1 shows a corrugated board sheet 10 according to the first embodiment. The corrugated board sheet 10 is one in which a liner 11 is bonded to one side of a corrugated board core (hereinafter, simply referred to as a core) 12, and is called a single-sided corrugated board sheet. As shown in FIG. 1, the core 12 has a wave height of 4.6 to 4.
4.8 mm (abbreviated to about 4.7 mm in the figures and below), the number of peaks per 30 cm is 34 ± 0.5, and the peaks and valleys are formed by one arc, and the peaks are Let R1 be the arc of and R2 be the arc of the valley, then R2
-R1 is 0.38 mm or less. Table 1 shows a comparison of the results of the evaluation of three cores having the same number of about 4.7 mm but different peak numbers. The target of evaluation is
The corrugated board sheet 10 is the standard corrugated board sheet shown in FIG. 13, and the economy corrugated board sheet is shown in FIG. The evaluation items are the relative consumption rate of the core, the relative cumulative tension, and the relative strength of the sheet, and are shown as relative values when the standard corrugated cardboard sheet is 100. Table 1
As shown in, the number of mountains per 30 cm is 34 ± 0.
It is understood that the use of the five cores according to the present invention has the vertical compressive strength and the box compressive strength of the sheet at the same level as the conventional standard stage and the economy stage, and the amount of the core used can be reduced. Here, in the present invention, that the peak and the valley are formed by one arc (one arc) means that the peak and the valley have one R. Since one arc is simpler than a complicated step shape such as two arcs, (1) step machining is easy and processing cost can be reduced, and when the crests of the step rolls mesh with each other, Since the rounded R and the sloped straight part are smooth, the corrugated core does not get caught in this part, and there is no core breakage or core cracking, and a corrugated corrugated board with good quality is manufactured. It is possible. Also, R2-
R1 = 0.38 mm or less means that when it exceeds this,
This is because the middle core, which has been wound between the corrugating rolls during the middle core rolling operation, shifts in the traveling direction of the rolling operation, resulting in “step running”, which makes it impossible to carry out the appropriate running operation.

[0012]

[Table 1]

In the above corrugated cardboard sheet 10, the corrugated fiberboard core 12 can be manufactured by the manufacturing apparatus according to the present embodiment described later without complicating the process or increasing the number of processes. Moreover, as described with reference to Table 1, it can be seen that the requirements of high strength and low cost are combined.

Next, the corrugated board sheet 20 according to the second embodiment will be described with reference to FIG. The corrugated board sheet 20 according to the second embodiment is one in which liners 211 and 212 are bonded to both front and back surfaces of a core 22, and is called a double-sided corrugated board sheet. As shown in FIG. 2, the center core 22 also has a wave height of about 4.7 mm, the number of peaks per 30 cm is about 34 ± 0.5, and the peaks and valleys are formed by one arc. As well as the arc of the mountain
1. If the arc of the valley is R2, R2-R1 is 0.38m
It is less than m. Like the corrugated board sheet 10 according to the first embodiment, the corrugated board sheet 20 described above can be manufactured without complicating the steps or increasing the number of steps, and also has the requirements of high strength and low cost.

Next, a corrugated board sheet 30 according to the third embodiment will be described with reference to FIG. In the corrugated board sheet 30 according to the third embodiment, liners 311 and 312 are adhered to both front and back surfaces of a core 321. The core 322 is bonded to the surface of the liner 312 to which the core 321 is not bonded. The liner 313 is bonded to the side of the center core 322 to which the liner 312 is not bonded. The corrugated board sheet 30 is called a double-sided double-faced corrugated board sheet. As shown in FIG. 3, the core 321 and the core 322 have different forms. The center core 321 has a wave height of about 4.7 mm, the number of peaks per 30 cm is about 34 ± 0.5, and the peaks and valleys are formed by one arc, and the arc of the peak is formed. Is R1 and the arc of the valley is R2, R2-R1 has a structure of 0.38 mm or less. On the other hand, the center core 322 has a wave height of about 2.5 mm and a number of peaks per 30 cm of about 50 ± 3 peaks. The above corrugated cardboard sheet 30 is also the first
Similar to the corrugated board sheet 10 according to the embodiment, it can be manufactured without complicating the process or increasing the number of processes, and also has the requirements of high strength and low cost.

Next, a corrugated board sheet 40 according to the fourth embodiment will be described with reference to FIG. The corrugated board sheet 40 according to the fourth embodiment has two identical cores 421 and 422.
Are stacked. Two cores 421, which are overlapped
Liners 411 and 412 are adhered to both front and back surfaces of 422, which is a type of double-sided corrugated board sheet. As shown in FIG. 4, the center cores 421 and 422 also have a wave height of about 4.7 mm and the number of peaks per 30 cm is about 34 ± 0.5.
Assuming that the peak and the valley are formed by one arc, and the arc of the peak is R1 and the arc of the valley is R2, R2-R1 is 0.38 mm or less. In the corrugated board sheet 40 according to the fourth embodiment, the wave height of the corrugated shape is about 4.7 mm, the number of peaks per 30 cm is 34 ± 0.5, and the cores 421 and 422 are used. The strength is higher than that of the corrugated board sheet 10 according to the first embodiment.

Next, a corrugated board sheet 50 according to the fifth embodiment will be described with reference to FIG. The corrugated board sheet 50 according to the fifth embodiment has two different cores 521 and 522 stacked on each other, and has a liner 51 on the front and back surfaces thereof.
1, 512 are bonded. The core 521 is the core 5
The wave height is higher than 22. The center core 521 has a wave height of about 4.7 mm, and the number of peaks per 30 cm is 34 ± 0.5.
Assuming that the peak and the valley are formed by one arc, and the arc of the peak is R1 and the arc of the valley is R2, R2-R1 is 0.38 mm or less. On the other hand, the center core 522 has a wave height of about 3.4 mm and the number of peaks per 30 cm is 34 ± 0.5 peaks. The corrugated cardboard sheet 50 according to the fifth embodiment has a wave height of about 4.7 m.
In m, the number of mountains per 30 cm is 34 ± 0.5, and the center is 5
21 and the cores 522 having different wave heights are overlapped, the corrugated cardboard sheet 1 according to the first embodiment is used.
The strength is higher than 0. Furthermore, it has a cushioning property (higher cushioning effect) than the corrugated board sheet 40 according to the fourth embodiment.

Next, a corrugated board sheet 60 according to the sixth embodiment will be described with reference to FIG. The corrugated board sheet 60 according to the sixth embodiment has the same two cores 621, 62.
2 is compounded by adhering the tops to each other. Then, the upper surface of the center core 621 in the figure and the center core 62.
The corrugated cardboard sheet 60 is configured by bonding liners 611 and 612 to the lower surface of FIG. The center cores 621 and 622 have a wave height of about 4.7 mm.
And the number of peaks per 30 cm is 34 ± 0.5, and the peaks and valleys are formed by one arc, and
If the arc of the mountain is R1 and the arc of the valley is R2, then R2-R1
Is 0.38 mm or less. The corrugated board sheet 60 according to the sixth embodiment has the same effect as that of the first embodiment, and since the same two cores 621 and 622 have a structure in which their tops are adhered to each other, the cushioning effect can be enhanced.

Next, a corrugated board sheet 70 according to the seventh embodiment will be described with reference to FIG. The corrugated board sheet 70 according to the seventh embodiment also has two cores 721 and 72.
It is a composite of 2. On the other hand, the center core 721 has a wave height of about 4.7 mm and has 3 peaks per 30 cm.
4 ± 0.5 peaks, and the peaks and valleys are formed by one arc, and the arc of the peak is R1 and the arc of the valley is R.
When set to 2, R2-R1 is 0.38 mm or less. The other center core 722 has a wave height of about 2.4 mm.
The number of peaks per 30 cm is 68 ± 1. In this way, the center core 722 has a wave height of about ½ of the center core 721,
And the number of mountains is double. The upper surface of the core 721 and the core 7
The liner 711 and 712 are adhered to the lower surface of 22 to form the corrugated cardboard sheet 70. The corrugated board sheet 70 according to the seventh embodiment has a wave height of about 4.7 mm, and the number of peaks per 30 cm is 34 ± 0.5.
Since the core 721 of the mountain is used, the same effect as that of the first embodiment is obtained. Moreover, since the core 722 is also used, the buffering effect is high.

Finally, a corrugated board sheet 80 according to the eighth embodiment will be described with reference to FIG. Corrugated board sheet 80 according to the eighth embodiment has three identical cores 821, 8
22 and 823 have liners 811 and 812 on both front and back surfaces.
813 and 814 are glued together. However, the liners 812 and 813 located inside are common liners to the cores 821 and 823 located on the front and back surfaces. The cores 821 to 823 have a wave height of about 4.7 m.
In m, the number of mountains per 30 cm is 34 ± 0.5,
Moreover, when the peak and the valley are formed by one arc, and the arc of the peak is R1 and the arc of the valley is R2, R2-
Since R1 is 0.38 mm or less, the corrugated board sheet 80 according to the eighth embodiment has the same effect as that of the first embodiment. Moreover, since the corrugated board sheet 80 according to the eighth embodiment has a structure in which double-sided corrugated board is laminated in three stages, the strength is extremely high.

Next, an example of an apparatus for manufacturing the corrugated board sheet 10 according to the first embodiment will be described. FIG. 9 is a diagram schematically showing the main components of an apparatus M (corrugated board sheet manufacturing apparatus) for manufacturing the corrugated cardboard sheet 10.
The corrugated board sheet manufacturing apparatus M is a so-called "single facer" that directly manufactures a single-sided corrugated board sheet by simultaneously manufacturing a corrugated board core and attaching a liner to one surface of the corrugated board core.

As shown in FIG. 9, the corrugated board sheet manufacturing apparatus M has a pair of stepped rolls 104a and 104b, a gluing roll 105, and a pressure roll 110.
As shown in FIG. 10, the stepped roll 104a (104b) includes a cylindrical main body 114a (114b), and a corrugated portion 124a (124b) having a corrugated shape arranged on the outer periphery of the roll main body 114a (114b). Composed of.
The wavy portion 124a (124b) has a wave height of about 4.7 mm, and the number of peaks per deployment length of 30 cm is 34 ±.
It is formed to have 0.5 peaks. Also, the peaks and valleys are formed by one arc, and the arc of the peak is R
1. If the arc of the valley is R2, R2-R1 is 0.38m
m or less.

The stepped rolls 104a and 104b are arranged so that the corrugated portions 124a and 124b mesh with each other at the valleys and the peaks. The corrugated shape formed on the corrugated portions 124a and 124b is transferred to the core material 12a by passing the core material 12a through the gap between the stepped rolls 104a and 104b meshed with each other.
After the transfer, the core material 12a has a wave height of about 4.7 mm, the number of peaks is 34 ± 0.5, and the peaks and valleys are formed by one arc, and If the arc is R1 and the arc of the valley is R2, R2-R1 is 0.
The corrugated board core 12 having a diameter of 38 mm or less is manufactured.

While the center core 12 is wound around the stepped roll 104b, the center core 12 is glued by the glue roll 105. That is, the outer peripheral surface of the gluing roll 105 is arranged so as to come into contact with the top of the core 12,
By transferring the glue 107 to the outer peripheral surface of the gluing roll 105, the glue 107 can be attached to the top of the core 12. On the gluing roll 105, excess glue 107
A scraping roll 106 and a scraper 111 for scraping off the scraps are arranged. The pressure roll 110 supplies the liner 11. The pressure roll 110 is arranged with a predetermined gap from the stepped roll 104b. The core 12 and the liner 11 are passed through this gap at the same time to press them together. By this crimping, the core 12
And the liner 11 is bonded. According to the above corrugated cardboard sheet manufacturing apparatus M, the corrugated wave has a wave height of about 4.7 mm and the number of peaks is 34 ± 0.5, and the stepped rolls 104a and 104b.
Since the build-up tension is reduced when the center core 12 is wound, the high-quality corrugated cardboard sheet 10 can be manufactured by preventing step breaks and step cracks during the stepping.

Next, another example of the corrugated board sheet manufacturing apparatus will be described with reference to FIG. The corrugated board sheet manufacturing apparatus N is identical to the corrugated board sheet manufacturing apparatus M described above in that it has a pair of stepped rolls 104a and 104b and a gluing roll 105. In the corrugated cardboard sheet manufacturing apparatus N, the same parts as those of the corrugated cardboard sheet manufacturing apparatus N are denoted by the same reference numerals, and the description thereof may be omitted.

Although the corrugated board sheet manufacturing apparatus M presses the core 12 and the liner 11 by the pressure roll 110, the corrugated cardboard sheet manufacturing apparatus N uses the tension applied to the belt 109 to press the core 12 and the liner 11 together. Pressurize.
As shown in FIG. 11, the belt 109 is wound around a pair of belt rolls 108a and 108b. Figure 1
As shown in FIG. 1, in the corrugated board sheet manufacturing apparatus N, a pair of stepped rolls 104a and 104b are arranged in the vertical direction. The core material 12a is supplied from the right side in the figure,
Further, it passes between the pair of stepped rolls 104a and 104b. During this passage, the wavy shapes formed on the wavy portions 124a and 124b are transferred to the core material 12a. After the transfer, the center core material 12a has a wave height of about 4.7 mm and the number of peaks is 34 ± 0.5.

While the core 12 is wound around the stepped roll 104b, the center roll 12 is glued by the glue roll 105. Add extra glue 10 to the gluing roll 105.
Like the corrugated board sheet manufacturing apparatus M, a scraping roll 106 for scraping off 7 is provided.
The liner 11 is supplied from the belt roller 108a side.
The liner 11 advances toward the belt roller 108b while being held by the belt 109. Belt roller 1
By rotating 08a and the belt roller 108b in the direction of the arrow in the figure, the core 12 and the liner 11 are continuously adhered to continuously manufacture the one-sided corrugated cardboard sheet 10.

Next, another example of the corrugated board sheet manufacturing apparatus will be described with reference to FIG. FIG. 12 is a diagram schematically showing main components of the corrugated board sheet manufacturing apparatus O. Figure 1
As shown in FIG. 2, the cardboard sheet manufacturing apparatus O has the same basic configuration as the cardboard sheet manufacturing apparatus N. However, in the corrugated board sheet manufacturing apparatus O, the corrugated board sheet manufacturing apparatus N is configured such that the pair of belt rolls 108a and 108b
While the pressure applied to the liner 11 and the core 12 by using the belt 109 hung on them, the pressure applied to the liner 11 and the core 12 by the pair of rolls without using the belt 109. Is given. The corrugated board sheet manufacturing apparatus O includes a low nip pressurizing roll 112a and a sheet tension adjusting roll 112b. The low nip pressurizing roll 112a is rotatably supported in the direction of the arrow in the drawing around its rotation axis. This rotating shaft is fixed. The sheet tension adjusting roll 112b is supported rotatably in the direction of the arrow in the drawing around its rotation axis. The sheet tension adjusting roll 112b is arranged so as to be movable in the circumferential direction of the stepped roll 104a. By adjusting this moving position, the winding amount and tension of the liner 11 and the core 12 around the stepped roll 104a can be controlled. By controlling this tension, the pressing force of the liner 11 to the center core 12 is set.

The present invention is not limited to the above-described embodiments, but may be modified as appropriate without departing from the spirit of the present invention.

[0030]

As described above, according to the present invention,
A high-strength corrugated board sheet can be obtained without complicating the steps or increasing the number of steps.

[Brief description of drawings]

FIG. 1 is a side view showing a corrugated board sheet according to a first embodiment of the present invention.

FIG. 2 is a side view showing a corrugated board sheet according to a second embodiment of the present invention.

FIG. 3 is a side view showing a corrugated board sheet according to a third embodiment of the present invention.

FIG. 4 is a side view showing a corrugated board sheet according to a fourth embodiment of the present invention.

FIG. 5 is a side view showing a corrugated board sheet according to a fifth embodiment of the present invention.

FIG. 6 is a side view showing a corrugated board sheet according to a sixth embodiment of the present invention.

FIG. 7 is a side view showing a corrugated board sheet according to a seventh embodiment of the present invention.

FIG. 8 is a side view showing a corrugated board sheet according to an eighth embodiment of the present invention.

FIG. 9 shows a stepped roll for producing a core according to the present invention.

FIG. 10 is a diagram showing an example of an apparatus for manufacturing a corrugated board sheet according to the first embodiment of the present invention.

FIG. 11 is a diagram showing another example of the apparatus for manufacturing the corrugated board sheet according to the first embodiment of the present invention.

FIG. 12 is a diagram showing another example of an apparatus for manufacturing a corrugated board sheet according to the first embodiment of the present invention.

FIG. 13 is a side view showing a conventional corrugated board sheet.

FIG. 14 is a side view showing a conventional corrugated board sheet.

[Explanation of symbols]

10, 20, 30, 40, 50, 60, 70, 80 ... Corrugated cardboard sheets 11,211,212,311,31
2,313,411,412,511,512,61
1,612,711,712,811,812,81
3,814 ... Liner, 12, 22, 321, 322, 4
21,422,521,522,621,622,72
1, 722, 821 ... Core for corrugated board material, 104a, 1
04b ... Stepped roll, 114a ... Roll body, 124
a ... corrugated portion, 105 ... glue roll, 106 ... scraping roll, 107 ... glue, 108a, 108b ... belt roll, 109 ... belt, 110 ... pressure roll, 112a
... low nip pressurizing roll, 112b ... sheet tension adjusting roll, 113 ... winding adjusting roll

Claims (9)

[Claims] 1. A sheet-shaped material having a wave height of 4.6 to 4.8 mm, the number of peaks per 30 cm is 34 ± 0.5, and the peaks and valleys are one arc. A core for corrugated board material, characterized in that R2-R1 is 0.38 mm or less, where R1 is the arc of the mountain and R2 is the arc of the valley while being formed. 2. A circular arc having a wave height of 4.6 to 4.8 mm, a number of peaks per 30 cm of 34 ± 0.5, and a peak and a valley formed by a sheet-shaped material. And the arc of the mountain is R1 and the arc of the valley is R2, R2-R1 is disposed on at least one surface of the corrugated cardboard core having 0.38 mm or less and the corrugated cardboard core. A cardboard sheet having a liner. 3. The corrugated board sheet according to claim 2, wherein the liners are provided on both sides of the corrugated board core. 4. The corrugated board sheet according to claim 2, which is combined with a corrugated board sheet having a corrugated board core different from the corrugated board core in the wave height and the number of peaks of the corrugated shape. 5. The corrugated board sheet according to claim 2, which is combined with a corrugated board sheet having a corrugated board core in which the wave height and the number of peaks of the corrugated shape match the corrugated board core. . 6. The corrugated board core has a corrugated height of 4.6 to 4.8 mm and three peaks per 30 cm.
4 ± 0.5 peaks, and the peaks and valleys are formed by one arc, and the arc of the peak is R1 and the arc of the valley is R.
The corrugated cardboard sheet according to claim 2 or 3, wherein R2-R1 is a stack of a plurality of cores of 0.38 mm or less. 7. The corrugated board core has a corrugated height of 4.6 to 4.8 mm and three peaks per 30 cm.
4 ± 0.5 peaks, and the peaks and valleys are formed by one arc, and the arc of the peak is R1 and the arc of the valley is R.
If it is 2, the first core having R2-R1 of 0.38 mm or less, the wave height and the number of peaks per 30 cm are the first.
The corrugated cardboard sheet according to any one of claims 2 to 5, wherein a second core different from the core is laminated. 8. A corrugated fiber core production apparatus for forming a predetermined corrugated core by pressure-feeding a pair of stepped rolls in which sheet material is meshed with each other, wherein the stepped roll is a cylinder. A roll-shaped roll main body and a corrugated corrugated portion formed on the outer peripheral portion of the roll main body, the corrugated portion having a wave height of 4.6 to 4.8 mm,
The number of peaks per cm is 34 ± 0.5, and the peaks and valleys are formed by one arc, and when the arc of the peak is R1 and the arc of the valley is R2, R2-R1 is 0.5. Three
A device for manufacturing a corrugated board core, which is 8 mm or less. 9. A pair of stepped rolls that form a predetermined corrugated core by pressure-feeding a sheet material, and a gluing roll that transfers a paste solution to the top of the core formed by the stepped rolls. And a pressure-bonding roll for pressure-bonding the core and liner glued by the gluing roll, wherein the stepped roll has a cylindrical roll body and a wavy shape formed on an outer peripheral portion of the roll body. Including a wavy portion, the wave height of the wavy portion is 4.6 ~ 4.8 mm, the number of peaks per 30 cm is 34 ± 0.5, and the peaks and valleys are formed by one arc, The arc of the mountain is R1,
The corrugated board sheet manufacturing apparatus is characterized in that R2-R1 is 0.38 mm or less, where R2 is the arc of the valley.