Half-cut lined single-sided cardboard

Abstract

To provide a single-faced corrugated cardboard excellent in followability to a packaging article shape and cushioning property.SOLUTION: In a single-faced corrugated cardboard where a liner 2 is stuck to one face of a middle core 1 having a corrugated flute, ruled lines 3 crushing the corrugated flute in a thickness direction and half cuts 4 cut up to the depth not reaching the liner 2 are formed in parallel on the middle core 1 so as to extend in a direction orthogonal to a corrugation direction. This single-faced corrugated cardboard C1 has properties of the single-faced corrugated cardboard which can be rolled so that the direction orthogonal to the flute direction of the middle core 1 becomes a circumferential direction, and further can be easily bent along the ruled line 3 and the half cut 4 where bending resistance is weakened; thus, when an article is packaged, it is flexibly bent in a plurality of directions so as not to separate from the surface of the article so much, and obtains high followability to the article shape. Further, since the flute of the middle core 1 is easily crushed, excellent cushioning property can be acquired. In addition, when the middle core 1 is in a flute leaning state, the cushioning property is improved.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This invention relates to single-faced corrugated cardboard that is primarily used as a packaging material for goods. [Background technology]

[0002] In recent years, mail order sales using the Internet have become widespread, and when shipping such products, packaging methods are often adopted in which the products are wrapped in bubble cushioning made of plastic film and then stored in a cardboard box, or the products are wrapped in plastic film together with a cardboard backing and then stored in a cardboard box.

[0003] The plastic sheets used in such packaging have a negative impact on the environment if illegally dumped, so attempts are being made to use paper packaging instead, which does not use plastic.

[0004] For example, in order to create a packaging form that cushions and holds an item using only a paper sheet, it is possible to use a cushioning material such as that described in the following Patent Document 1. As shown in Fig. 6, this cushioning material is made of single-faced corrugated cardboard C2 with a liner 52 attached to one side of a corrugated corrugated core 51, and lines 53 are made by crushing the corrugations in the thickness direction so that they run obliquely at an angle of 45° in opposite directions to the corrugation direction of the core 51.

[0005] When packaging an item, this cushioning material can be rolled into a cylindrical shape so that the direction perpendicular to the corrugation direction of the single-sided cardboard C2 is the circumferential direction to surround the item. It can also be folded along the lines 53 that run in opposite directions to give it the appearance of a tortoiseshell-shaped polyhedron, with the inner surface of the part surrounded by the lines 53 in contact with the surface of the item, making it possible to encase irregularly shaped items such as a vase.

[0006] Furthermore, the following Patent Document 2 describes a packaging bag made of a paper sheet, which comprises an outer bag 60 and a cushioning material 61 attached thereto, the cushioning material 61 being folded in half at the bottom end with horizontally extending cut lines 62 in a staggered pattern, as shown in Fig. 7, and in which the cushioning material 61 is suspended between the opposing inner surfaces of the outer bag 60. When an article is stored inside the cushioning material 61 of this packaging bag, the cushioning material 61 extends downward to create a three-dimensional cushioning cell, protecting the article from impact. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2008-036996 A [Patent Document 2] JP 2017-193376 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, when using a cushioning material made of single-sided corrugated cardboard C2 as shown in FIG. 6, the portion near the ruled line 53, which forms the ridge of the polyhedron, becomes considerably separated from the object when the cushioning material is used to wrap an object, resulting in a problem that the cushioning material has poor conformability to the shape of the object.

[0009] Furthermore, in the case of a paper sheet cushioning material 61 as shown in FIG. 7, when in use and stretched to form cushioning cells, there is a problem that sufficient cushioning properties are not obtained compared to cardboard, in which a corrugated corrugated core and a liner attached to the corrugated core form a dense hollow structure.

[0010] Therefore, an object of the present invention is to provide a single-faced corrugated board that is excellent in conformity to the shape of an article and in cushioning properties. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention provides a liner attached to one side of a corrugated corrugated core. E fluteIn the single-faced corrugated board, the core has parallel lines formed by crushing the wavy corrugations in the thickness direction, and half cuts cut to a depth that does not reach the liner, so as to extend in a direction perpendicular to the corrugation direction.

[0012] In addition, the steps of the core are designed to have a step flow state in which the step top on one side is gentle and the other side is steep.

[0013] Moreover, the half cut is cut in to a depth of at least half the height of the step.

[0014] In addition, the distance between the ruled lines and the half-cuts, or between the ruled lines or between the half-cuts, is set to be 3 mm or more and 15 mm or less.

[0015] Furthermore, the lines and the half cuts are arranged in the same order over the entire surface of the core. Effect of the Invention

[0016] The single-faced cardboard of the present invention has the property of being rolled so that the direction perpendicular to the corrugation direction of the core becomes the circumferential direction, and in addition, it can be easily bent along the creases and half cuts that have weakened bending resistance, so that when an item is packaged, it can be flexibly bent in multiple directions without straying too far from the surface of the item, and can be highly conformable to the shape of the item.

[0017] In addition, the corrugations of the core are cut in half to make them easily crushed when an impact is applied, providing excellent shock-absorbing properties, and the shock-absorbing properties can be further improved by making the corrugations of the core flow. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view showing a single-faced corrugated board according to an embodiment of the present invention; [Diagram 2] FIG. 1 is a partial perspective view showing the crease, FIG. 2 is a partial perspective view showing the half-cut, and FIG. 3 is a partial side view showing the step flow of the same. [Diagram 3] (a) is a perspective view showing an article wrapped in the cushioning material; (b) is a cross-sectional view taken along the line AA in (a); [Figure 4] A perspective view showing an impact tester for measuring shock absorption properties. [Diagram 5] (a) Basic pattern, (b) Pattern with widely spaced weakening lines, (c) Pattern with a high ratio of half-cut lines, (d) Pattern with a high ratio of ruled lines for the same single-sided corrugated board. [Figure 6] (a) is a plan view showing a single-faced corrugated board cushioning material described in Patent Document 1, and (b) is a partial cross-sectional view in a direction perpendicular to the corrugation direction. [Figure 7] A perspective view showing a packaging bag provided with the cushioning material described in Patent Document 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0020] As shown in Figure 1, single-faced cardboard C1 has a liner 2 attached to one side of a corrugated core 1, and the core 1 of this single-faced cardboard C1 has a number of parallel lines 3 and half cuts 4 that act as weakening lines and extend perpendicular to the corrugation direction, which is the direction in which the corrugation tops extend.

[0021] As shown in Fig. 2(a), the crease 3 is formed by squeezing the step of the core 1 in the thickness direction, and as shown in Fig. 2(b), the half cut 4 is formed by cutting the step of the core 1 to a depth that does not reach the liner 2. Also, as shown in Fig. 2(c), the step of the core 1 has a step flow state in which one side of the step apex 1a is gently inclined and the other side is steeply inclined.

[0022] For example, when a book-shaped item G, which is a mail-order product, is packaged for shipping using a packaging material made of single-sided cardboard C1 as described above, as shown in Figure 3, two sheets of single-sided cardboard C1 cushioning material are placed facing each other with the core 1 on the inside, and the item G is sandwiched between the cores 1.The parts of the single-sided cardboard C1 facing the edges are then glued or pressed together, and the liner 2 forms an envelope-like shape that serves as the outer surface on which slips and the like are affixed.

[0023] This packaging material made of single-sided cardboard C1 has the property of being rolled so that the direction perpendicular to the corrugation direction of the core 1 is the circumferential direction, and in addition, it can be easily bent along the lines 3 and half cuts 4, which have weakened bending resistance, so that when packaging an item G, it can flexibly bend in multiple directions without straying too far from the surface of the item G, and can highly conform to the shape of the item.

[0024] In addition, since the steps of the core 1 are cut by half-cutting 4 and are in a step-flow state, the steps of the core 1 are easily crushed when an impact is applied, excellent cushioning properties are obtained, and damage to the packaged item G during transportation can be prevented.

[0025] The cushioning properties of the single-faced corrugated cardboard C1 as described above were measured using an impact tester (manufactured by Tester Sangyo Co., Ltd.) as shown in FIG. 4, and the results shown in Table 1 were obtained.

[0026] This impact testing machine has a support pillar 22 and a guide rod 23 rising from a base 21 on which a test piece of single-sided cardboard C1 is placed, and a weight section 24 equipped with an impact sensor and a disk-shaped impact section 25 are dropped along the guide rod 23, causing the impact section 25 to collide with the top surface of the test piece of single-sided cardboard C1, thereby measuring the G-value.

[0027] The test conditions were static stress of 0.0052 kg / cm 2 The drop height was 60 mm, and the test piece of single-faced corrugated board C1 was EF (grammage: liner 120 g / m 2 , core 115g / m 2 ), BF (grammage: liner 120g / m 2 , core 115g / m 2), AF (grammage: liner 210g / m 2 , core 120g / m 2 )

[0028] [Table 1]

[0029] According to the test results, by adding the lines 3 and the half cuts 4, the cushioning properties are improved regardless of the flutes (flute marked "F"). Therefore, for single-faced corrugated board C1, the flutes are classified as EF / ΔF / BF / CF / AF, in order of finer and thinner flutes. Here, the object of the right is only the thinnest EF, and the others are only reference examples. ΔF is for a material with 60±2 crests per 30 cm and a thickness of approximately 2 mm (manufactured by Rengo Co., Ltd.).

[0030] The depth of the cut in the half cut 4 is from half to the full height of the corrugation 1 depending on the properties of the single-faced cardboard material and the shape of the item to be packaged.

[0031] Further, the step flow may not be necessary, but it is preferable that it is present.

[0032] The distance between the lines 3 and the half-cut sheets 4 is set to 3 mm or more and 15 mm or less, because if it is too wide, the cushioning effect decreases (see Fig. 5 (a) and (b)). The same applies to the distance between the lines 3 or between the half-cut sheets 4.

[0033] The ratio of the numbers of the lines 3 and the half cuts 4 is 30:1 to 1:3, and the lines 3 and the half cuts 4 are arranged in the same order over the entire surface (see FIGS. 5(a) to (d)).

[0034] Incidentally, the single-faced corrugated board C1 as described above can be used not only as an exterior packaging material as shown in Fig. 3, but also as a cushioning material that is inserted into an outer box after wrapping an item, so it is expected to have a wide range of environmentally friendly applications as a replacement for plastic film bubble cushioning, etc. Furthermore, in addition to its use as a packaging material, it can also be used as a display material, etc., taking advantage of its flexible formability. [Explanation of symbols]

[0035] C1 single-sided corrugated board 1 core 1a tier top 2 Liner 3. Borders 4 cut in half G Goods

Claims

Claim 1 A single-faced corrugated board (C) of E-flute type having a liner (2) attached to one side of a corrugated corrugated medium (1) having corrugated corrugations, characterized in that the medium (1) has parallel lines (3) formed by squeezing the corrugated corrugations in the thickness direction and half cuts (4) cut to a depth that does not reach the liner (2) so as to extend in a direction perpendicular to the corrugation direction. 1 ). Claim 2 2. The single-faced corrugated board (C) according to claim 1, wherein the corrugations of the corrugation medium (1) are in a corrugation flow state in which the corrugation top (1a) is gentle on one side and steep on the other side. 1 ). Claim 3 The single-faced corrugated board (C) according to claim 1 or 2, characterized in that the half cut (4) is cut to half or more of the height of the flute. 1 ). Claim 4 The single-faced corrugated board (C) according to any one of claims 1 to 3, characterized in that the distance between the crease (3) and the half cut (4), or the distance between the creases (3) or between the half cuts (4) is 3 mm or more and 15 mm or less. 1 ). Claim 5 The single-faced corrugated board (C) according to any one of claims 1 to 4, characterized in that the creases (3) and the half cuts (4) are arranged in the same order over the entire surface of the corrugated medium (1). 1 ).

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