WO2005077764A1

WO2005077764A1 - Packaging method and packaging device

Info

Publication number: WO2005077764A1
Application number: PCT/JP2004/007488
Authority: WO
Inventors: Tamaki Utada; Kenzou Ogata; Noboru Nakanishi; Junichi Murakami; Masaki Arai
Original assignee: Nihon Matai Co., Ltd.; Tachikawa Danboru Kogyo Co., Ltd.
Priority date: 2004-02-13
Filing date: 2004-05-31
Publication date: 2005-08-25
Also published as: JP2005225523A

Abstract

A packaging method and a packaging device capable of safely packaging a packaged article without providing thermal damage to the packaged article, wherein the packaged article (2) is packaged by an upper packaging material (3) disposed on the upper surface side of the packaged article (2) and a lower packaging material (4) disposed on the lower surface side of the packaged article (2). The both packaging materials (3) and (4) are manufactured by using waved corrugated fiberboards formed of corrugated core sheets (3a) and (4a) in which corrugations are formed in a non-linear shape such as plane waveforms and flat-plate like surface materials (3b) and (4b) formed integrally with one surface side of the corrugated core sheets (3a) and (4a). Autohesive layers (5) allowing to provide adhesiveness only between adhesive layers are formed on the entire surfaces of the corrugated core sheets (3a) and (4a). The both packaging materials (3) and (4) are adhered to each other by applying pressure only to the end edge portions thereof.

Description

Specification

Packing method and packing device

Technical field

The present invention relates to a packing method and a packing apparatus using corrugated cardboard as a packing material, and more particularly to a wave corrugated cardboard manufactured using a corrugated core sheet having a corrugated row having a non-linear shape such as a plane waveform. The present invention relates to a packing method and a packing device used as a device.

Background art

[0002] Conventionally, packing of objects to be packed has been widely performed using corrugated cardboard as a packing material, and a corrugated row is manufactured using a corrugated core sheet having a non-linear shape such as a plane waveform. Wave corrugated cardboard is also generally known.

Patent Document 1: Japanese Patent Publication No. 5-79019

Disclosure of the invention

Problems to be solved by the invention

[0003] By the way, the wave corrugated cardboard has the advantage that the strength balance in the vertical and horizontal directions is improved and the corrugate is less crushed when pressure is applied. There is a problem that no method has been proposed and wave cardboard is not fully utilized.

[0004] The present invention has been made in view of the current state of force, so that it is possible to effectively use the advantages of wave corrugated cardboard and to safely pack a packaged object without causing heat damage to the packaged item. It is an object to provide a method and a packaging device.

[0005] Another object of the present invention is to shorten the packing line to save space.

[0006] It is another object of the present invention to allow an object to be packed to be packed with one raw material wound in a roll shape.

[0007] Another object of the present invention is to make it possible to reduce the winding diameter of a raw material wound in a roll shape.

[0008] Another object of the present invention is to reduce the use amount of the self-adhesive adhesive constituting the self-adhesive adhesive layer. The goal is to minimize it.

Another object of the present invention is to make it possible to prevent the object to be packed from moving in the packing material by utilizing the anti-slip effect of the self-adhesive adhesive layer.

[0010] Another object of the present invention is to make it possible to prevent the article to be packaged from being wet by utilizing the moisture-proof effect of the self-adhesive adhesive layer.

Another object of the present invention is to make the thickness of the self-adhesive adhesive layer uniform.

[0012] Another object of the present invention is to make it possible to prevent the self-adhesive adhesive layer from being damaged when the corrugated line is provided.

[0013] Another object of the present invention is to enable a wide original material to be used for purposes other than packing materials.

[0014] Still another object of the present invention is to enable accurate positioning, particularly when a self-adhesive adhesive layer is provided only on a pressure-bonded portion of a corrugated core sheet.

Means for solving the problem

[0015] In order to achieve the above object, the present invention provides a corrugated core sheet in which the corrugated rows are formed in a non-linear shape such as a plane waveform, and a flat surface material integrated on one surface side of the corrugated core sheet. The upper and lower packing materials made of corrugated cardboard are stacked on top of each other with the corrugated core sheet inside and the material to be packed interposed between both packing materials, and then at least separation of both packing materials The characteristic feature is that the adhesive edges can be obtained only by the adhesive layers, and the package is bonded by pressure through the self-adhesive adhesive layer.

[0016] The present invention also relates to a method of forming each packing material into a belt-shaped upper and lower web material having the same width as each packing material and wound in a roll shape with the corrugated core sheet inside. , Each of which is cut to a predetermined length in the feed-out direction.

[0017] The present invention also provides a method of forming a strip-shaped raw material having the same width as each packing material and wound in a roll shape with the corrugated core sheet on the inner side in a feeding direction. It is characterized in that it is cut into lengths and folded in two in the feeding direction. The

[0018] The present invention also relates to a method in which each packing material is formed into a strip-shaped raw material having a width twice as wide as each packing material and wound in a roll shape with the corrugated core sheet on the inner side. It is characterized in that it is folded in two and cut to a predetermined length in the feeding direction.

[0019] The present invention is also characterized in that the self-adhesive adhesive layer is provided only on the pressure-bonded portion of the corrugated core sheet in each packing material.

[0020] The present invention is further characterized in that the self-adhesive adhesive layer is provided on the entire surface of the corrugated core sheet in at least one of the packing materials.

[0021] The present invention is also characterized in that the self-adhesive adhesive layers are provided on the entire surface of the corrugated core sheet in both packing materials.

[0022] The present invention is also characterized in that the self-adhesive adhesive layer is provided on a flat corrugated core sheet raw material before a corrugated row is provided.

[0023] The present invention is also characterized in that the self-adhesive adhesive layer is provided before the wave cardboard is wound into a roll.

[0024] The present invention also provides a self-adhesive adhesive layer, which is obtained by cutting a wide raw material roll wound into a roll into a plurality of pieces in the width direction and re-rolling the material into a roll as a raw material for a packing material. It is characterized in that it is provided when winding.

[0025] The present invention is also characterized in that the self-adhesive adhesive layer is provided at an arbitrary stage after the raw material wound in a roll is fed out.

[0026] The present invention is also made of a corrugated corrugated row formed of a corrugated core sheet having a non-linear shape such as a plane waveform and a surface material integrated on one surface side of the corrugated core sheet. An upper packing material and a lower packing material which are stacked in a two-layered state with the corrugated core sheet inside; provided at least at the separated edge portions of each corrugated core sheet in both packing materials; A self-adhesive adhesive layer that can only provide adhesiveness between the adhesive layers, and at least the separated edges are added to the two packing materials in a state where a packaged object is interposed therebetween. It is characterized by pressure bonding.

[0027] The present invention is further characterized in that both packing materials are configured by folding a double-sized raw material into two folds. The invention's effect

[0028] The present invention provides a corrugated core sheet having a corrugated row having a non-linear shape such as a plane waveform, and a flat surface material integrated on one surface side of the corrugated core sheet. The upper packing material and the lower packing material are stacked on top of each other with the corrugated core sheet inside and the objects to be packed interposed between the two packing materials. Since the adhesive edge can be obtained only by the adhesive layer, the package is bonded by pressure through the self-adhesive adhesive layer. There is no danger of thermal damage even for packaged items that have little resistance to heat that need not be added. Also, in the case of a self-adhesive adhesive layer, adhesiveness can be obtained only between the adhesive layers, and there is a property that no adhesiveness can be obtained between the adhesive layer and the non-adhesive layer surface. There is no problem even if the article to be packed comes into contact with the self-adhesive adhesive layer. For this reason, there is no need to make the size of both packing materials larger than necessary for the items to be packed.

[0029] Further, in the case of a so-called ordinary parallel corrugated cardboard in which the corrugated line of the corrugated core sheet is a plane straight line, when pressure-bonded, the corrugated line is crushed and the strength of the bonded portion is reduced. Unless measures such as thickening the corrugated cardboard are adopted, heat bonding is unavoidable.However, in the case of wave corrugated cardboard, the collapse of the corrugated rows is reduced when pressure bonding is applied, resulting in a decrease in the packing material. The thickness can be reduced.

[0030] The present invention also provides a method for feeding each packing material into a belt-shaped upper material web and a lower material web which have the same width as the packing material and are wound in a roll shape with the corrugated core sheet inside. Since each part is cut to a predetermined length in the direction, it is possible to significantly reduce the space required for placing both raw materials in the packing line, and as a result, shorten the packing line and save space. Can be planned.

[0031] The present invention also relates to a method of forming a strip-shaped raw material having the same width as each packing material and wound in a roll shape with the corrugated core sheet on the inside in a predetermined direction in the feeding direction. Since it is cut into lengths and folded in two in the unwinding direction, it is possible to pack items to be packed with one roll of raw material. In addition, it is possible to simplify the pressure bonding mechanism by pressing and bonding the edges of both packing materials except for the bent portion. [0032] The present invention also relates to a method of forming a strip-shaped raw material having a width twice as wide as each packing material and wound in a roll shape with the corrugated core sheet on the inner side in the width direction. Since it is configured to be folded in two and cut to a predetermined length in the feeding direction, the winding diameter of the raw material wound into a roll can be reduced.

[0033] In the present invention, the self-adhesive adhesive layer is provided only on the pressure-adhesive portion of the corrugated core sheet in each packing material. Therefore, the self-adhesive adhesive constituting the self-adhesive adhesive layer is provided. The amount of agent used can be kept to a minimum necessary.

[0034] Further, in the present invention, since the self-adhesive adhesive layer is provided on the entire surface of the corrugated core sheet in at least one of the packing materials, the anti-slip effect of the self-adhesive adhesive layer is provided. Utilization can prevent movement of an object to be packed in the packing material.

[0035] In the present invention, the self-adhesive adhesive layer is provided on the entire surface of the corrugated core sheet in both packing materials. It is possible to prevent things from getting wet.

[0036] In the present invention, since the self-adhesive adhesive layer is provided on the flat corrugated core sheet raw material before the corrugated row is provided, even a simple roll coating or the like can be used. Self-adhesiveness The thickness of the adhesive layer can be made uniform.

In the present invention, since the self-adhesive layer is provided before the wave cardboard is wound into a roll, the self-adhesive layer is damaged when the corrugated rows are provided. Can be prevented.

[0038] The present invention also provides a method for cutting a self-adhesive adhesive layer from a wide raw material roll wound into a roll into a plurality of pieces in the width direction and re-rolling the material into a roll as a raw material for a packing material. Since it is provided at the time of winding, a wide raw material can be used for purposes other than the packing material.

In the present invention, the self-adhesive adhesive layer is provided at an arbitrary stage after the raw material wound in a roll is fed out. Positioning can be performed accurately when provided only on the pressure-bonded portion of the core sheet.

[0040] The present invention further provides a wave corrugated ball formed of a corrugated core sheet in which the corrugated row forms a non-linear shape such as a plane waveform and a surface material integrated on one surface side of the corrugated core sheet. Manufactured and laminated in two layers with the corrugated core sheet inside Upper and lower packing materials; self-adhesiveness that is provided at least at the separated edges of each corrugated core sheet in both packing materials, and that adhesiveness can only be obtained with the adhesive layer An adhesive layer is provided, and at least the separated edges are pressure-bonded to each other in a state where the packing material is interposed between the packing materials. It is possible to pack the package safely without making use of the advantages and without causing thermal damage to the package.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a packing device according to a first embodiment of the present invention. The packing device 1 includes an upper packing material 3 disposed on an upper surface side of an object 2 to be packed, and a packing device 3. And a lower packing material 4 arranged on the lower surface side of the object 2. The two packing materials 3 and 4 are integrally bonded by applying only pressure to the edge portion E thereof. It has become.

That is, each of the packing materials 3 and 4 is a corrugated core sheet 3a, 4a in which the corrugated row forms a non-linear shape such as a plane waveform, and a table integrated on one surface side of the corrugated core sheet 3a, 4a. It is made of wave corrugated cardboard composed of face materials 3b and 4b, and these two packaging materials 3 and 4 are stacked in two layers with the corrugated core materials 3a and 4a inside. I have.

The corrugated core sheets 3a, 4a and the surface materials 3b, 4b are manufactured using various kinds of papers such as a liner, a core, a coated paper, and a power paper.

As shown in FIG. 2, a self-adhesive adhesive layer 5 is provided on the entire surface of each of the corrugated core sheets 3a and 4a. These self-adhesive adhesive layers 5 also serve as a slip-proof layer and a moisture-proof layer of the packaged object 2.

The self-adhesive adhesive layer 5 is formed by applying a natural rubber latex-based self-adhesive or a synthetic resin-based self-adhesive to the surface of the corrugated core sheets 3a, 4a using a spray or an application roll. As a self-adhesive adhesive of a natural rubber latex type, for example, “Sanpinol Pressure Adhesive E” (trade name) manufactured by Seiden Chemical Co., Ltd. is used. I'm familiar.

[0045] The corrugated cardboard was manufactured in a wide band shape and then corrugated. When stocking as a wide base material rolled up in a roll shape with the sheet inside and using it as each of the packing materials 3 and 4, cut the base material into multiple pieces in the width direction and A narrow raw material obtained by rewinding this into a roll shape is used, but the self-adhesive adhesive layer 5 is used in a stage before winding into a roll shape as a wide original raw material. Also, it may be provided at the stage of rewinding a wide original material into a roll shape as a material for narrow packaging material, and a corrugated line may be provided. It may be provided on a flat corrugated core sheet material before it is formed.

FIG. 3 shows a packing line for packing the article 2 to be packed. Hereinafter, a packing method according to the present embodiment will be described with reference to FIG.

When packing the article 2 to be packed, first, the corrugated core sheet 3a (see FIG. 2) is placed inside, and the upper raw material 11 is unwound from the belt-shaped upper raw material 11 wound in a roll shape. With the sheet 4a (see Fig. 2) inside, the lower raw material 12 is unwound from the lower raw material 12 which is wound into a roll. As a result, the two raw materials 11 and 12 are fed out with the corrugated core sheets 3a and 4a inside. At this time, a self-adhesive adhesive layer 5 (see FIG. 2) is already provided on the entire surface of the corrugated core sheets 3a and 4a.

Simultaneously with or before or after the unwinding of the two raw materials 11 and 12, the article 2 to be packed is placed on the conveyor belt 13 at a constant timing by using an automatic machine (not shown). Then, the packaged object 2 is sent to the pressurizing / cutting unit 14 while being sandwiched from above and below by the two webs 11 and 12, and is then fed into the pressurizing / cutting unit 14. The pieces 11 and 12 are cut to a certain size, and the edge E (see FIG. 1) is pressed. As a result, the packaged object 2 packed with the upper packing material 3 and the lower packing material 4 is discharged onto the carry-out belt 15.

By the way, since the self-adhesive adhesive layer 5 has such a property that adhesiveness can be obtained only between the adhesive layers, as shown in FIG. 3, the two raw materials 11 and 12 are rolled. Can be rolled up. For this reason, the arrangement space of the two webs 11 and 12 in the packing line can be significantly reduced, and as a result, the packing line can be shortened to save space.

Further, since the self-adhesive adhesive layer 5 has a property of bonding only by applying pressure, it is not necessary to apply heat at the time of bonding. For this reason, even if the package 2 is a product that is extremely There is no danger of the package 2 being thermally damaged during packaging.

[0050] Further, since the self-adhesive adhesive layer 5 has anti-slip property and moisture-proof property, the self-adhesive adhesive layer 5 provided on the entire surface of the corrugated core sheets 3a, 4a allows the two packings to be formed. It is possible to prevent the sliding movement of the packaged object 2 in the materials 3 and 4, and to protect the packaged object 2 from moisture.

[0051] In the above embodiment, the case where the raw materials 11 and 12 in which the self-adhesive adhesive layer 5 is provided in advance over the entire surface of the corrugated core sheets 3 and 4 has been described. The raw materials 11 and 12 may not be provided with the self-adhesive adhesive layer 5, but may be provided with the self-adhesive adhesive layer 5 at, for example, the position of the line L shown in FIG.

[0052] In this case, as described above, the self-adhesive adhesive layer 5 may be provided on the entire surface of both corrugated core sheets 3a and 4a, respectively, but the edge portions E of both packing materials 3 and 4 may be provided. The self-adhesive adhesive layer 5 may be provided only at a portion corresponding to the above, so that the amount of the self-adhesive adhesive used can be reduced.

[0053] For example, the upper raw material 11 is provided with the self-adhesive adhesive layer 5 only at a portion corresponding to the edge portion E of the upper packing material 3, and the lower raw material 12 is provided with the corrugated core sheet 4a. A self-adhesive adhesive layer 5 may be provided on the entire surface. Thus, although the moisture-proof effect is not necessarily sufficient, at least the anti-slip effect can be sufficiently obtained.

FIG. 4 shows a second embodiment of the present invention, in which the upper packing material 3 and the lower packing material 4 are formed by one raw material 21.

That is, in FIG. 4, reference numeral 21 denotes a strip-shaped raw material having the same width as each of the packing materials 3 and 4 and wound in a roll shape with the corrugated core sheet on the inside. 21 is fed out to the packing line at a predetermined speed by the feed roller 23.

As shown in FIG. 4, a cutting roller 24 and an S-line roller 25 are sequentially provided on the downstream side of the feed roller 23, and the raw material 21 fed by the feed roller 23 is It is cut to a predetermined length by the cutting hole roller 24, specifically, twice as long in the feed direction as each of the packing materials 3 and 4, and a folding line 26 is formed by a line roller 25 at the center in the feed direction. It is being formed. The packaged material 2 is placed on the cut material 27. Next, the cut material 27 is folded in two from the folding line 26 by a bending mechanism 28, and both sides in the feeding direction are pressure-bonded by a pressure roller 29, and furthermore, After that, the front and rear edges in the feed direction are pressure-bonded by the pressure mechanism 30. As a result, a packaging device 1 is formed in which the entire periphery of both packaging materials 3 and 4 is pressure-bonded.

At this time, since the bent portion of the cut raw material 27 is continuous without pressure bonding, pressure bonding should be performed on at least three separated sides. Just fine.

However, in the case of the present embodiment, the article 2 to be packed can be packed with only one raw material 21, so that the configuration of the packing line can be simplified.

FIG. 5 shows a third embodiment of the present invention, in which the material to be packed 2 is packed by folding the raw material 31 in the width direction.

That is, in FIG. 5, reference numeral 31 denotes a band-shaped raw material having a width twice as large as each of the packing materials 3 and 4 and wound in a roll shape with the corrugated core sheet inside. The material 31 is fed out to the packing line at a predetermined speed by the feed roller 33.

As shown in FIG. 5, on the downstream side of the feed roller 33, a holding belt 34 and a bending rail 35 for folding the raw material 31 into two in the width direction are provided, respectively. The package 2 is placed on the raw material 31 at the downstream side of the holding belt 34.

In FIG. 5, reference numeral 36 denotes a guide for preventing the raw material 31 from being displaced when the raw material 31 is folded in two.

As shown in FIG. 5, a pressing roller 37 for ensuring the bent portion of the folded web material 31 and both sides in the feeding direction are press-contacted on the downstream side of the bending rail 35 as shown in FIG. A pressure roller 38 is provided in order, and a gate-shaped pressure / cutting mechanism 39 having a pressing / cutting portion 39a and a pressing portion 39b is arranged downstream of the pressing roller 38. It is set up. With the above-described structure, the entire peripheral edges of both packing materials 3 and 4 are pressure-bonded and cut off from the raw material 31 as the packing device 1.

However, in the case of the present embodiment, the raw material 31 is folded in two in the width direction so as to pack the article 2 to be packed. Roll of raw material 31 The diameter size can be reduced.

In each of the above-described embodiments, each of the raw materials 11, 12, 21, and 31 wound in a roll is cut along a packing line to form each of the packing materials 3 and 4. Although the description has been given of the case where the packing material 2 is packed in advance, the packing materials 3 and 4 which have been cut to a predetermined size may be used.

Industrial applicability

As described above, the packing method and the packing apparatus according to the present invention are useful as a packing method and a packing apparatus using corrugated cardboard as a packing material. In particular, the corrugated row has a non-linear shape such as a flat waveform. It is suitable as a packing method and a packing apparatus using a wave corrugated ball manufactured using a corrugated core sheet as a packing material.

Brief Description of Drawings

FIG. 1 is an exploded perspective view showing a packing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view similar to FIG. 1.

FIG. 3 is an explanatory view of a packing line showing a packing method according to a second embodiment of the present invention.

FIG. 4 is a diagram corresponding to FIG. 3, showing a second embodiment of the present invention.

FIG. 5 is a diagram corresponding to FIG. 3, showing a third embodiment of the present invention.

Explanation of symbols

[0066] 1 Packing device

2 Items to be packed

3 Top packing material

3a, 4a Conore gate core sheet

3b, 4b surface material

4 Lower packing material

5 Self-adhesive adhesive layer

11 Uehara fabric

12 Shimohara material

13 Conveyor belt

14 Pressing and cutting unit 15 Delivery belt

21, 31

23, 33 Feed roller

24 Cutting roller

25 wire roller

26 Bending line

27 Cut raw material

28 Bending mechanism

29, 38 Pressure roller

30 Pressurizing mechanism

34 Holding belt

35 Bending rail

36 Guide

37 Holding roller

39 Pressing and cutting mechanism

39a Pressing and cutting section

39b '' Pressure section

E Edge

L line

Claims

The scope of the claims

[1] An upper packing material made of corrugated corrugated cardboard, comprising a corrugated core sheet in which the corrugated row forms a non-linear shape such as a plane waveform, and a flat surface material integrated on one side of the corrugated core sheet. The lower packing material is overlapped on two sheets with the corrugated core sheet inside and the packing material interposed between the two packing materials, and then at least the edges of both packing materials are separated by an adhesive layer. A packing method characterized by pressure bonding through a self-adhesive adhesive layer for packing, which can be obtained only by one another.

[2] Each packing material has a width equal to that of each packing material, and a band-shaped upper material web and a lower material web wound in a roll shape with the corrugated core sheet on the inner side are provided for a predetermined length in the feeding direction. 2. The packaging method according to claim 1, wherein the packaging method is configured by cutting each piece.

[3] Each packing material has the same width as each packing material, and cuts a strip-shaped raw material wound in a roll shape with the corrugated core sheet inside to a predetermined length in the feeding direction. 2. The packaging method according to claim 1, wherein the packaging method is configured to be folded in two in a feeding direction.

[4] Each packing material has a width twice as wide as each packing material, and a band-shaped raw material wound in a roll shape with the corrugated core sheet inside is folded into two in the width direction. 2. The packaging method according to claim 1, wherein the packaging method is configured to be cut to a predetermined length in a feeding direction.

5. The packing method according to claim 1, wherein the self-adhesive adhesive layer is provided only on the pressure-bonded portion of the corrugated core sheet in each packing material. .

[6] The packing method according to claim 1, wherein the self-adhesive adhesive layer is provided on the entire surface of the corrugated core sheet in at least one of the packing materials.

[7] The packing method according to claim 6, wherein the self-adhesive adhesive layers are provided on the entire surface of the corrugated core sheet in each of the packing materials.

[8] The packing method according to claim 7, wherein the self-adhesive adhesive layer is provided on the flat corrugated core sheet raw material before the corrugated rows are provided.

[9] The self-adhesive adhesive layer must be provided before the wave cardboard is wound into a roll. 8. The packing method according to claim 7, wherein:

[10] The self-adhesive adhesive layer is used for cutting a wide raw material rolled into a roll into a plurality of pieces in the width direction and rewinding the material into a roll as a raw material for packaging. The packaging method according to claim 7, wherein the packaging method is provided.

[11] The packing method according to claim 7, wherein the self-adhesive adhesive layer is provided at an arbitrary stage after unwinding the raw material wound into a roll.

[12] Corrugated corrugation is made of corrugated corrugated corrugated sheet made of corrugated core sheet and corrugated core sheet with non-linear shape such as planar corrugation

An upper packing material and a lower packing material which are stacked in a two-layered state with the corrugated core sheet inside; provided on at least separated edge portions of each corrugated core sheet in both of these packing materials, A self-adhesive adhesive layer capable of obtaining adhesiveness only between the layers, wherein the two packing materials are pressurized at least at the separated edges with an object to be packed interposed therebetween. A packing device characterized by being adhered.

13. The packing device according to claim 12, wherein both packing materials are formed by folding a material having a double size into two folds.

14. The packing apparatus according to claim 12, wherein the self-adhesive adhesive layer is provided only on the pressure-bonded portion of the corrugated core sheet in each packing material.

15. The packing device according to claim 12, wherein the self-adhesive adhesive layer is provided on the entire surface of the corrugated core sheet in at least one of the packing materials.

[16] The packing device according to claim 15, wherein the self-adhesive adhesive layers are provided on the entire surface of the corrugated core sheet in each of the packing materials.