Packaging material for building materials and method for manufacturing packaging material for building materials

Abstract

To provide a packing material and a manufacturing method of the packing material which have good followability to an item to be packed and high strength as a packing material application for building materials.SOLUTION: A packing material includes: a middle core with a waveform cross section; a first liner sheet bonded to one face of the middle core; and a second liner sheet bonded to the other face of the middle core, wherein at least one of the first liner sheet and the second liner sheet has a ruled line for folding the middle core, the first liner sheet and the second liner sheet so that they intersect a direction orthogonal to a waveform travel direction of the middle core.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure provides: For building materials Packaging materials and For building materials This relates to a manufacturing method for packaging materials. [Background technology]

[0002] Traditionally, building materials have been shipped in packaging materials such as cardboard boxes. When using pre-made box-shaped packaging materials, the sizes of the building materials and the packaging materials often do not match. For this reason, in order to prevent scratches and breakage during transportation, the space inside the packaging materials is filled with cushioning material before shipping the building materials, which results in a lot of waste at the construction site. Therefore, as a packaging material that can be made to match the size of building materials, single-faced corrugated cardboard, in which a liner sheet is adhered to only one side of a core having a corrugated cross section, is used (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication No. 04-060600 Summary of the Invention [Problem to be solved by the invention]

[0004] However, although the above-mentioned rolled cardboard conforms well to the contents being packed and does not require cushioning material, it lacks strength, especially at the corners of the contents being packed, and is therefore often not suitable as a packaging material for building materials. The present disclosure has been made in consideration of such problems, and its purpose is to provide a packaging material that has good conformability to the packed object and high strength for use as a packaging material for building materials. For building materials Packaging materials and For building materials To provide a method for manufacturing a packaging material. [Means for solving the problem]

[0005] In order to solve the above problems, a packaging material for building materials according to one embodiment of the present disclosure includes a core having a corrugated cross section, a first liner sheet adhered to one surface of the core, and a second liner sheet adhered to the other surface of the core, and at least one of the first liner sheet and the second liner sheet has creases formed therein for folding the core, the first liner sheet, and the second liner sheet so as to intersect with a direction perpendicular to the wave propagation direction of the core, and the creases are formed at intervals of 20 mm or more and 30 mm or less, and Each of is a direction parallel to the direction perpendicular to the wave propagation direction of the core Directions other than It is formed to stretch By doing so, the creases do not intersect with each other, and the core, the first liner sheet, and the second liner sheet can be folded along a direction intersecting with a direction perpendicular to the wave propagation direction of the core. .

[0006] A method for manufacturing a packaging material for building materials according to one embodiment of the present disclosure includes bonding a first liner sheet and a second liner sheet to both sides of a corrugated cross section of a core, and forming a plurality of creases for folding the core, the first liner sheet, and the second liner sheet at intervals of 20 mm or more and 30 mm or less in at least one of the first liner sheet and the second liner sheet so as to intersect with a direction perpendicular to the wave direction of the core. At the same time , the ruled line teeth , a direction parallel to a direction perpendicular to the wave propagation direction of the core Directions other than Formed to stretch By doing so, the creases do not intersect with each other, and the core, the first liner sheet, and the second liner sheet can be folded along a direction intersecting with a direction perpendicular to the wave propagation direction of the core. . [Effects of the Invention]

[0007] According to an aspect of the present disclosure, Good conformability to the packaged items and high strength for use as packaging material for building materials. Packaging materials and a manufacturing method for packaging materials for building materials can be provided. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an external view showing a configuration example of a packaging material according to a first embodiment of the present disclosure. FIG. [Figure 2] 1 is a cross-sectional view showing a configuration example of a packaging material according to a first embodiment of the present disclosure. [Figure 3] 1 is an external view showing an example of packaging an object having a rectangular cross section using a packaging material according to a first embodiment of the present disclosure. FIG. [Figure 4] 1 is an external view showing an example of packaging an object having a circular cross section using a packaging material according to a first embodiment of the present disclosure. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present disclosure will be described below through embodiments, but the following embodiments do not limit the invention according to the claims. Furthermore, not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. Furthermore, the drawings are merely schematic illustrations of the invention according to the claims, and the dimensions of the width, thickness, etc. of each part may differ from the actual dimensions, and the ratios between these dimensions may also differ from the actual dimensions.

[0010] A packaging material according to a first embodiment of the present disclosure will be described. The packaging material according to the present disclosure is, for example, a packaging material for packaging building materials. In the following description, the surface facing the packaged item may be referred to as the "bottom," and the surface opposite the surface facing the packaged item, which is the exterior surface of the packaging material, may be referred to as the "top." Hereinafter, each aspect of each embodiment of the present disclosure will be described with reference to the drawings.

[0011] 1. First embodiment (1.1) Basic composition of packaging materials The structure of the packaging material 1 according to the first embodiment will be described below with reference to Figures 1, 2, 3, and 4. Figure 1 is an external view showing an example of the configuration of the packaging material 1, and Figure 2 is a cross-sectional view showing an example of the configuration of the packaging material 1. Figures 3 and 4 are schematic diagrams each illustrating a state in which the packaging material 1 is used to pack packaged items 20A and 20B having different cross-sectional shapes.

[0012] 1 and 2, packaging material 1 includes core 11 having a corrugated cross section, a first liner sheet 12 bonded to one side of the core, and a second liner sheet 13 bonded to the other side of the core. At least one of first liner sheet 12 and second liner sheet 13 has creases 121 and 131 formed therein for folding core 11, first liner sheet 12, and second liner sheet 13, respectively, so as to intersect with a direction perpendicular to wave direction D of core 11. This improves the ability of packaging material 1 to conform to the packed item, eliminates the need for cushioning material, and also improves the strength of the corners of the packed item.

[0013] In this embodiment, the first liner sheet 12 has creases 121, and the second liner sheet 13 has creases 131. In Fig. 1, only the creases 121 of the first liner sheet 12 are shown, and the creases 131 of the second liner sheet 13 are not shown.

[0014] FIG. 3 shows an example of packaging an item 20A having a rectangular cross section in the packaging material 1, and FIG. 4 shows an example of packaging an item 20B having a circular cross section in the packaging material 1. As shown in Fig. 3, packaging material 1 is folded along lines 121 and 131 at the corners of rectangular packaged item 20A so as to fit the shape of the side of packaged item 20A. Packaged items 20A and 20B are covered with one or more sheets of packaging material 1. Packaging material 1 is arranged to cover the outer surfaces of packaged items 20A and 20B and is fixed in place with adhesive tape, string, or the like (not shown). This ensures that packaged items 20A and 20B are securely covered with packaging material 1. Each layer of the packaging material 1 will be described below.

[0015] <Middle core> As shown in FIG. 2, the core 11 is disposed between two opposing liner sheets (a first liner sheet 12 and a second liner sheet 13) and has a corrugated shape with peaks 111 and valleys 112. The core 11 is obtained by forming a liner sheet into a corrugated shape. Here, the "peaks 111" refer to the portions of the core 11 that are convex relative to the first liner sheet 12, and the "valleys 112" refer to the portions of the core 11 that are convex relative to the second liner sheet 13.

[0016] The core 11 is formed in a corrugated shape with the wave propagation direction in one direction within the plane of the liner sheet (direction D in Figures 1 and 2). By having such a corrugated shape and being disposed between the first liner sheet 12 and the second liner sheet 13, a large number of cylindrical spaces 113 extending in a direction perpendicular to the wave propagation direction are formed between the first liner sheet 12 and the second liner sheet 13. This allows the packaging material 1 to protect the building materials being transported from the vibrations and impacts of the vehicle during transportation. These cylindrical spaces 113 deform to maintain the space even when the packaging material 1 is folded, making the folded corners of the packaging material 1 less likely to be crushed.

[0017] The height t1 of the ridges 111 of the core 11 or the pitch between the ridges 111 t2 The height of the peaks 111 may be selected appropriately depending on the desired strength of the packaging material and the application scene. Here, the "height of the peaks 111" refers to the distance t1 between the outer surface of the top of the peaks 111 (upper surface 111A of the peaks 111 in FIG. 2) and the outer surface of the bottom of the valleys 112 (lower surface 112A of the valleys 112 in FIG. 2) in the thickness direction of the packaging material 1. Also, the "pitch of the peaks 111" refers to the distance between two adjacent peaks 111. t2 This refers to... In particular, for use in packaging building materials, the height of the ridges 111 of the core 11 is preferably 2000 μm or more and 5500 μm or less, and more preferably 2600 μm or more and 2900 μm or less. Furthermore, the pitch between the ridges 111 of the core 11 is preferably 5.7 mm or more and 8.5 mm or less, and more preferably 5.7 mm or more and 6.3 mm or less. By keeping the height of the ridges 111 and the pitch between the ridges 111 within the above-mentioned ranges, the thickness of the packaging material 1 is not unnecessarily thick, and the strength of the packaging material 1 is improved.

[0018] The core 11 can be made of, for example, paper, plastic film, nonwoven fabric, woven fabric, metal sheet, etc., but is preferably made of paper or a composite sheet mainly made of paper and a resin film or a resin coating film. Furthermore, the core 11 is bonded to the first liner sheet 12 and the second liner sheet 13 with an adhesive such as a starch adhesive, a hot melt adhesive, or a synthetic resin adhesive. More specifically, the upper surface 111A of the peaks 111 of the core 11 is bonded to the first liner sheet 12, and the lower surface 112A of the valleys 112 of the core 11 is bonded to the second liner sheet 13.

[0019] <Liner sheet> The first liner sheet 12 and the second liner sheet 13 have the function of improving the bending strength of the packaging material 1. Due to the peaks 111 and valleys 112, the first liner sheet 12 and the second liner sheet 13 have high bending strength in a direction perpendicular to the wave traveling direction D (in which the peaks 111 and valleys 112 extend), but extremely low bending strength in the wave traveling direction D. For this reason, by sandwiching both sides of the core 11 between the first liner sheet 12 and the second liner sheet 13 and bonding the peaks 111 to the first liner sheet 12 and the valleys 112 to the second liner sheet 13, the bending strength of the packaging material 1 in the wave traveling direction D can be improved, and the strength of the entire packaging material 1 can be improved.

[0020] The thickness of the first liner sheet 12 and the second liner sheet 13 may be selected appropriately depending on the desired strength of the packaging material and the intended use. In particular, for use in packaging building materials, the thickness of the first liner sheet 12 and the second liner sheet 13 is preferably 160 μm or more and 190 μm or less. By setting the thickness of the first liner sheet 12 and the second liner sheet 13 within the above range, the bending strength of the core 11 in the wave propagation direction D can be improved. The first liner sheet 12 and the second liner sheet 13 are formed of the same material as the core 11 .

[0021] The outer dimensions of the first liner sheet 12 and the second liner sheet 13 may be appropriately selected depending on the items to be packed. Specifically, the outer dimensions of the first liner sheet 12 and the second liner sheet 13 may be, for example, a length (length in the wave traveling direction D) of 1000 mm to 2500 mm and a width (length in the direction perpendicular to the wave traveling direction D) of 400 mm to 800 mm, and may be 2000 mm x 640 mm or 2000 mm x 520 mm.

[0022] <ruled lines> The creases 121 are formed so as to intersect with a direction perpendicular to the wave direction of the core 11 for folding the first liner sheet 12 (i.e., the direction in which the peaks 111 or valleys 112 extend). The creases 131 are formed so as to intersect with a direction perpendicular to the wave direction of the core 11 for folding the second liner sheet 13. Here, "formed so as to intersect with a direction perpendicular to the wave propagation direction of the core 11" means that the lines 121 and 131 are formed so as to extend in a direction other than the direction parallel to the extension direction of the peaks 111 or valleys 112. If the lines 121 and 131 are formed parallel to the extension direction of the peaks 111 or valleys 112, when the packaging material 1 is folded, there will be no cylindrical space 113 at the folded corner, which makes the folded corners prone to collapse, which is not preferable. In order to provide a cylindrical space 113 at the folded corner, the lines 121 and 131 should be formed so as to intersect with the wave propagation direction of the core 11. parallelSpecifically, the ruled lines 121 and 131 are preferably formed at an angle of 10 degrees or less with respect to the wave traveling direction. parallel It is more preferable that the grooves are formed in the direction of the arrows (i.e., extending in the direction D).

[0023] It is preferable that the multiple creases 121 and 131 are formed at intervals of 20 mm to 30 mm. By forming the creases 121 and 131 at intervals within this range, it becomes possible to fold the packaging material 1 along the outer shape of the material to be packaged while maintaining the stiffness of the packaging material 1.

[0024] (1.2) Packaging material manufacturing method A method for manufacturing the above-mentioned packaging material 1 will now be described. The packaging material 1 is formed by adhesively bonding a first liner sheet 12 and a second liner sheet 13 to both sides of a core 11 having a corrugated cross section, and forming a line (at least one of lines 121 and 131) on at least one of the first liner sheet 12 and the second liner sheet 13 for folding the core 11, the first liner sheet 12, and the second liner sheet 13 so that the line intersects with a direction perpendicular to the wave propagation direction of the core 11. Such packaging material 1 is formed, for example, using a box former. The box former forms creases 121 in the first liner sheet 12, extending in a predetermined direction (a direction that intersects with the direction perpendicular to the wave direction of the corrugation of the medium 11 when the packaging material 1 is completed). In this case, the box former arranges many folding pieces to form multiple creases 121 in a single crease processing step, or performs the crease processing step multiple times while moving the first liner sheet 12 to form multiple creases 121. Multiple creases 131 can also be formed in the second liner sheet 13 in a similar manner. Next, a first liner sheet 12 and a second liner sheet 13 are bonded to both sides of the core 11, respectively, to form the packaging material 1.

[0025] In the above-described manufacturing method, the lines 121, 131 are formed in the first liner sheet 12 and the second liner sheet 13, and then the liner sheets are bonded to both sides of the core 11 to form the packaging material 1. However, the manufacturing method of the packaging material is not limited to this. For example, the lines 121, 131 extending in a predetermined direction may be formed after the liner sheets are bonded to both sides of the core 11.

[0026] (1.3) Effects of this embodiment The packaging material according to this embodiment has the following effects.

[0027] (1) The packaging material of this embodiment comprises a core having a corrugated cross section, a first liner sheet adhered to one side of the core, and a second liner sheet adhered to the other side of the core, and at least one of the first liner sheet and the second liner sheet has lines formed thereon for folding the core, the first liner sheet, and the second liner sheet, the lines extending in a direction perpendicular to the wave propagation direction of the core. This allows the packaging material 1 to conform to the packed item more easily, eliminates the need for cushioning material, and also improves the strength of the corners of the packed item.

[0028] (2) The packaging material according to this embodiment has a plurality of ruled lines formed at intervals of 20 mm or more and 30 mm or less. This allows the packaging material to be folded along the outer periphery of the packaged material while maintaining its stiffness.

[0029] (3) The creases on the packaging material according to this embodiment are formed at an angle of 10 degrees or less with respect to the wave traveling direction. This makes it difficult for the folded corners of the packaging material to be crushed.

[0030] (4) The packaging material of this embodiment is manufactured by adhering a first liner sheet and a second liner sheet to both sides of a core having a corrugated cross section, and forming a score line on at least one of the first liner sheet and the second liner sheet for folding the core, the first liner sheet, and the second liner sheet, extending in a direction perpendicular to the wave propagation direction of the core. This makes it possible to form a packaging material that conforms well to the packed item, does not require cushioning material, and also improves the strength of the corners of the packed item. [Example]

[0031] Examples and comparative examples of the present disclosure will be described below.

[0032] Example 1 Thickness: 160μm to 190μm, basis weight: 160g / m 2 A first liner sheet and a second liner sheet each having a length of 2000 mm and a width of 640 mm and made of a liner sheet (C5 liner) of the same type were prepared. Next, using a box former, creases extending in the length direction of the first liner sheet and the second liner sheet were formed at 25 mm intervals. Next, a liner sheet (the C5 liner described above) was prepared with a thickness of 3 mm and a corrugated cross section with a peak height of 2780 μm and a peak pitch of approximately 6 mm (B flute). The outer dimensions of the core were 2000 mm long and 640 mm wide, the same as those of each liner sheet, and the peaks and valleys were formed so that the length direction was the wave propagation direction. After applying starch adhesive only to the top surfaces of the peaks and the bottom surfaces of the valleys of the core (outside the convex parts on both sides of the core), the first liner sheet and the second liner sheet were placed on both sides of the core so that their outlines matched, and the top surfaces of the peaks and the first liner sheet and the bottom surfaces of the valleys and the second liner sheet were bonded and dried. In this way, the packaging material of Example 1 was formed. That is, in the packaging material of Example 1, the direction of the creases was parallel to the wave propagation direction of the core.

[0033] <Comparative Example 1> A packaging material of Comparative Example 1 was formed in the same manner as in Example 1, except that a core material in which peaks and valleys were formed so that the width direction was the wave propagation direction was used. That is, in the packaging material of Comparative Example 1, the direction of the creases was perpendicular to the wave propagation direction of the core.

[0034] <Comparative Example 2> A packaging material of Comparative Example 2 was formed in the same manner as in Example 1, except that no score lines were formed.

[0035] <Evaluation: Evaluation of crushed folded corners> The packaging materials of the Examples and Comparative Examples were used to cover the sides of an object having a rectangular cross section in the length direction of the packaging material. The object was a member having a length of 2000 mm, a weight of 10 kg, and a square cross section. In Example 1 and Comparative Example 1, the ruled lines of the packaging material were folded over the corners of the object before packaging. In Comparative Example 2, the packaging material was folded over the corners of the object before packaging. Next, the appearance of the folded corners of the packaging material was visually confirmed. After this, the packaged item covered with the packaging material was held on a flat plate with the folded corners of the packaging material directly underneath, and the appearance of the folded corners was visually confirmed to see how much they had been crushed. This confirmed how much the folded corners had been crushed, and evaluated how difficult it was for the folded corners to be crushed. The evaluation was based on the following criteria. ○: The folded corners of the packaging material were not crushed at all. △: The packaging was folded at the corners, but was crushed. ×: The folded corners of the packaging material were not neatly formed, and the packaging material covering the corners of the packaged item was crushed.

[0036] The evaluation results are shown in Table 1 below.

[0037] [Table 1]

[0038] As shown in Table 1, the packaging material of Example 1, in which lines are formed so as to intersect in a direction perpendicular to the wave propagation direction of the core, is less likely to have its folded corners crushed than the packaging material of Comparative Example 1, in which lines are formed extending in a direction perpendicular to the wave propagation direction of the core, and the packaging material of Comparative Example 2, in which no lines are formed.

[0039] Although the present disclosure has been described above using embodiments, the technical scope of the present disclosure is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included in the technical scope of the present disclosure. [Explanation of symbols]

[0040] 1 Packaging materials 11 Core 111 Yamabe 112 Valley 113 Cylindrical Space 12 First liner sheet 13 Second liner sheet 121,131 lines 20A,20B Items to be packed

Claims

1. A core with a wavy cross section, a first liner sheet adhered to one surface of the medium; a second liner sheet adhered to the other surface of the core; Equipped with At least one of the first liner sheet and the second liner sheet has a crease formed therein for folding the core, the first liner sheet, and the second liner sheet, the crease intersecting a direction perpendicular to a wave direction of the core, The ruled lines are formed at intervals of 20 mm or more and 30 mm or less, Each of the creases is formed to extend in a direction other than a direction parallel to a direction perpendicular to the wave propagation direction of the core, so that the creases do not intersect with each other, and the core, the first liner sheet, and the second liner sheet can be folded along a direction perpendicular to the wave propagation direction of the core. Packaging material for building materials.

2. The ruled lines are formed at an angle of 10 degrees or less with respect to the wave traveling direction. The packaging material for building materials according to claim 1.

3. A first liner sheet and a second liner sheet are bonded to both sides of a corrugated cross section of a core, A plurality of creases for folding the core, the first liner sheet, and the second liner sheet are formed at intervals of 20 mm or more and 30 mm or less on at least one of the first liner sheet and the second liner sheet so as to intersect with a direction perpendicular to the wave propagation direction of the core, and the creases are formed so as to extend in directions other than a direction parallel to the direction perpendicular to the wave propagation direction of the core, so that the creases do not intersect with each other and the core, the first liner sheet, and the second liner sheet can be folded along a direction intersecting with the direction perpendicular to the wave propagation direction of the core. Manufacturing method for building packaging materials.

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