JPH07329955A - Corrugated case - Google Patents

Abstract

PURPOSE:To easily tear a corrugated case at the corner parts thereof to remarkably improve a tearability without increasing a production cost and lowering a strength, such as a compression strength, required of the corrugated case. CONSTITUTION:In a corrugated case A formed by providing a tearing mechanism 20 peripherally on a case body composed of at least a top plate 11, a bottom plate 12, and side plates 13 and provided with corner parts 14, as the tearing mechanism 20 a band-form perforation line part 21 is provided on a rear liner of a corrugated fibreboard, and band-form cutout parts 22 reaching a top surface liner are provided in the corner parts 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated cardboard box or the like in which an opening mechanism is provided around a corrugated cardboard box and the bottom side of the corrugated cardboard box can be displayed in a store by the opening mechanism. The present invention relates to a cardboard box that can be opened very easily without lowering the strength required for the cardboard box.

[0002]

2. Description of the Related Art Generally, a cardboard box is used for various products due to its characteristics, for example, bottled detergents for homes and kitchens,
It is often used as a packaging box for canned beverages such as canned beer,
These cardboard boxes are provided with various opening mechanisms in order to open and subdivide the boxes quickly and easily.

As an opening mechanism for such a cardboard box, for example, as shown in FIG. 10 (a), two parallel cut lines 2 are provided in the entire cross section of the cardboard 1 and a strip-shaped cutout portion 3 is provided. Structure (Japanese Utility Model Publication No. 4-17458) or, as shown in FIG.
A structure in which two parallel cut lines 2 are provided only on the back side liner of the above and a band-shaped cut-out portion 3 is provided (Actual exploitation 53-14
No. 0624), as shown in FIG. 10C, the cut tape 4 is attached to the inside, and the cut tape 4 inside the cut tape 4 is attached.
Structure that causes the opening (for example, Japanese Utility Model Sho 57-1)
No. 1002) is known.

As shown in FIG. 10 (a), in the structure in which two parallel cut lines 2 are provided on the entire cross section of the corrugated board 1 and the strip-shaped cutout portion 3 is provided, the compression strength is largely deteriorated. However, there is a problem that the cardboard box may be damaged due to the products stored in the product during stacking or transportation, and since the score line 2 appears on the front (outer) liner,
There are issues such as limited printing space and impaired aesthetics.

By the way, this type of cardboard box is usually
It has a box shape having at least a corner portion composed of a top plate, a bottom plate, and a side plate, and as shown in FIGS. 11 (a) and 11 (b),
The corner portion 5 is formed by bending a corrugated cardboard sheet, that is, a bent portion 9 formed by crushing the front and back liners 6, 7 and the core 8.

However, in the opening mechanism [FIG. 10 (b)] in which two parallel cut lines 2 are provided on the back liner of the corrugated cardboard 1 and the strip-shaped cut portion 3 [FIG. 10 (b)], the bent portion 9 is used.
Since the corner portion 5 formed by bending is more resistant than other portions, there is a problem that the corner portion 5 is easily cut. Also, the one using the cut tape 4 [FIG.
In (c)], since the resistance at the corners 5 is large, there is a problem that the cut tape 4 may be cut off if the tear tape is forcibly torn off. Moreover, since the step of attaching the cut tape is required, the cost is increased. There is a problem that becomes.

[0007]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems of the prior art, and even a corrugated cardboard box having a corner portion provided with an opening mechanism can be compressed without increasing the manufacturing cost. An object of the present invention is to provide a cardboard box that can be opened very easily without lowering the strength required for the cardboard box.

[0008]

As a result of intensive studies to solve the above-mentioned conventional problems, the inventors of the present invention have found that a box having at least a corner portion composed of a top plate, a bottom plate and a side plate is provided around the box body. By providing a specific opening mechanism, the cardboard box for the above purpose was successfully obtained, and the present invention was completed. That is, the cardboard box of the present invention is a cardboard box provided with an opening mechanism around a box body having at least a corner portion composed of an upper plate, a bottom plate and a side plate, wherein the opening mechanism is a belt-shaped sewing machine on a back liner of the cardboard. In addition to the provision of the eye portion, a strip-shaped cut portion reaching the front liner is provided at the corner portion.

[0009]

According to the present invention, in the corrugated cardboard box provided with the above-mentioned specific opening mechanism around the box body having at least the top plate, the bottom plate and the side plate, the corners of the box have a higher resistance than the other parts. At most, since the strip-shaped notch reaching the front liner is provided in the corner portion, the tearing at the corner can be performed very easily, and the opening mechanism has a strip-shaped notch on the back liner. Since the perforations are provided, the appearance of the front side liner is not impaired, and the vertical compression strength, which is the most important strength required for a cardboard box, is not reduced. Will be described in more detail in the test example).

[0010]

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 4 show a first embodiment of the present invention. As shown in FIGS. 1 to 3, the corrugated board box A of this embodiment is assembled and processed from a corrugated board sheet 10 including a front side liner 10a, a center core 10b, and a back side liner 10c, and as shown in FIG. Is a rectangular parallelepiped box body having a bottom plate 12 and side plates 13, and the side plate 13 of the box body has four corners 14, 14, ...
An opening mechanism 20 is provided.

This cardboard box A, as shown in FIG.
Four bent portions 15, 15, ... Are formed on the rectangular side plate 13, and a seam allowance 16 is continuously provided on one widthwise end of the side plate 13 via the bent portion 15, so that Two inner flaps 11a, 12a and outer flaps 11b, 12b are respectively provided on both end edges in the longitudinal direction via a bent portion 17, and the inner flaps 11a, 12a and the outer flaps 11b, 12b are formed at the time of forming the box body. Are polymerized and fixed to form an upper plate 11 and a bottom plate 12.

The side plate 13 is provided at the lower part of the central portion thereof.
An unsealing mechanism 20 for unsealing which connects both ends across 3 is provided. As shown in FIGS. 2 to 4, the unsealing mechanism 20 includes a strip-shaped perforation portion 21 on the back side liner 10c of the corrugated cardboard sheet 10 and the strip-shaped perforation portion 2
In the width direction including the above-mentioned respective corner portions 14 which are on the same line as 1, a strip-shaped cut portion 22 reaching the front liner 10a is provided and a cut portion 23 is provided. The lateral (longitudinal) direction length of the band-shaped cut portion 22 is set to be at least longer than the lateral (longitudinal) direction length of the bent portion 15. In addition, an H-shaped cutting line portion 24 for cutting that extends from the front side liner 10a to the back side liner 10c is provided on the perforated portion 21. In addition, X between the reference numerals 14a and 14a in FIG. 3 indicates a corner (corner), and is a drawing in a state before forming the corner (before crushing).

In the corrugated cardboard box A of the present embodiment constructed as described above, first, the H-shaped cutting line portion 24 is raised to the left and right,
As shown in, the cutout portion 23 can be opened by continuously tearing it off from one side. At this time, even if each corner portion 14 formed by bending the bent portion 15 has a larger resistance than the other portions, each corner portion 14 is provided with a band-shaped cut portion 22 reaching the front side liner 10a. Therefore, the tearing at the corner portion 14 can be performed very easily. Further, in the unsealing mechanism 20, since the back side liner 10c is provided with the band-shaped perforation portion 21, the front side liner 10a has the band-shaped sewing machine. The eye portion 21 is not exposed, so that the printing space of the front side liner 10a is not restricted and the appearance is not spoiled.

(Test Example) Next, using the cardboard boxes of the above-mentioned embodiment and the conventional example, in accordance with JIS Z 1506, the case of a single body (fixed with a flap) shown in FIG. 5 and FIG. The vertical compression strength, strain amount, water content, and tear strength during cutting were tested in the case of a two-stage cloth (flap fixed). The results are shown in Tables 1 and 2 below. The test in the case of the single body (fixed with the flap) shown in FIG. 5 was carried out by fixing the inner flap by sandwiching the symbol S part in the drawing with a jig in order to make the same conditions as the contents loaded product. In addition, the test in the case of the two-stage cross (fixed flap) shown in FIG. 6 is performed in order to know the deterioration of the compressive strength when it is loaded on a pallet and stored. The degree of deterioration of compressive strength is different, and it is a standard for actual loading. The materials, dimensions, and unsealing structure of the cardboard boxes of the examples and the conventional example are as follows.

(Example) Material: B280 / SCP125 / B280 g / cm ²
Step A Dimensions: L x W x D = 300 x 240 x 270 mm Specifications of perforations: See Fig. 7 (a: 15 mm, b: 1 mm,
c: 12 mm) A band-shaped cut portion 22 formed in the corner portion 14
Specifications: [Longitudinal direction: 20mm, Width direction: 12mm] Opening structure: See Fig. 1 and Fig. 2.

(Conventional example) Material: B280 / SCP125 / B280 g / cm ²
Step A Dimensions: L × W × D = 300 × 240 × 270 mm Structure: JIS Z 1507 Code No. 0201 Opening structure: Cut tape OPP tape (thickness 60 μ
m, width 4 mm)

[0017]

[Table 1]

[0018]

[Table 2]

[Discussion of Tables 1 and 2] Above Tables 1 and 2
As is clear from the above, the cardboard box provided with the unsealing mechanism of the present embodiment has almost the same compressive strength, strain amount, and tearing strength at the start and intermediate portions during cutting as compared with the cardboard box using the conventional cut tape. Turned out to be a level. Therefore, it was found that the corrugated cardboard box of this example could be easily torn off at the corners, and could be opened very easily without lowering the compressive strength in the vertical direction.

8 and 9 show another embodiment of the present invention. The corrugated cardboard box B of the present embodiment is a wrap round type, and has a rectangular top plate 11 and a bottom plate 12 which are opposed to each other.
And two side plates 13 facing each other and the seam allowance 16 are bent portions 15
Are serialized through. Further, outer flaps 13a are projected from both end edges of the top plate 11 and the bottom plate 12 via bent portions 17a, and inner flaps 13b are projected from both end edges of both side plates 13 via bent portions 17b. During the formation of the box, the outer flap 13a and the inner flap 13b are polymerized and fixed to each other to form an end plate (side plate).

The side plates 13 and 13 are provided with two unsealing mechanisms 20 for unsealing at the central part and connecting both ends thereof in the same manner as in the embodiment A. To open the corrugated cardboard box B of this embodiment having the above-described structure, the H-shaped cut line portion 24 is raised to the left and right, and can be torn to open in the same manner as in the above-described embodiment A, and the same action and effect can be obtained. Can be achieved.

The present invention is constructed and used as described above, but is not limited to the above-mentioned embodiments, and various design changes etc. can be made without departing from the scope of the present invention. It is possible. For example, the lengths in the longitudinal direction or the width direction of the perforations 21 and the notches 22 of the corners 14 are set to appropriate lengths depending on the shape of the cardboard box, the type of products to be stored, and the like. is there. Further, the configuration other than the unsealing mechanism which is the gist of the present invention is not particularly limited, for example, a three-dimensional shape, or a box-like shape having a corner having at least a top plate, a bottom plate, and a side plate, or It may be a box body having a triangular shape or a polygonal shape having a pentagonal shape or more.

[0023]

EFFECTS OF THE INVENTION According to the present invention, tearing at the corners is easy, the appearance of the front liner is not impaired, and the compressive strength is at the same level as that of a conventional corrugated cardboard box using a cut tape. Further, there is provided a cardboard box that can be opened very easily without increasing the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a cardboard box of the present invention in a perspective mode.

FIG. 2 is a schematic development view of FIG.

FIG. 3 is a partial sectional view showing an essential part of the present invention.

FIG. 4 is a partial perspective view showing an example of an opened state of the cardboard box of the present invention.

FIG. 5 is a cardboard box used in a test example of the present invention (single unit,
It is a perspective view of (flap fixation).

FIG. 6 is a perspective view of a cardboard box (two-stage cross, flap fixed) used in a test example of the present invention.

FIG. 7 is a plan view showing an example of dimensions of perforations in the present invention.

FIG. 8 is a perspective view showing another example of the cardboard box of the present invention in a perspective mode.

FIG. 9 is a schematic development view of FIG.

10A is a partial sectional view showing an example of an opened state of a conventional cardboard box, FIG. 10B is a partial sectional view showing another example of an opened state of a conventional cardboard box, and FIG. It is a fragmentary sectional view showing other examples of the opened state of a carton box.

11A is a partial cross-sectional view showing an example of a bent portion of a conventional cardboard box in a sheet state, and FIG. 11B is a partial cross-sectional view showing an example of a bent state by the bent portion.

[Explanation of symbols]

 A Cardboard box 10 Cardboard sheet 11 Upper plate 12 Bottom plate 13 Side plate 14 Corner 20 Opening mechanism 21 Perforation 22 Notch

Claims (1)

[Claims] 1. A cardboard box provided with an opening mechanism around a box body having at least a top plate, a bottom plate, and a side plate, the opening mechanism having a band-shaped perforation portion on a back liner of the cardboard. At the same time, the corrugated cardboard box is characterized in that a strip-shaped notch reaching the front liner is provided at the corner portion.