JPH074179Y2 - Corrugated board fracture structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a breaking structure of a corrugated board used for a divisible corrugated cardboard packaging box.

[Conventional technology]

For example, as a rupture structure of a corrugated cardboard packaging box which is divided into upper and lower parts such as a packaging box for canned beer and opened, as shown in FIG. There is one in which extending cut lines b are provided in parallel, and a portion sandwiched by the cut lines is torn off to the outside by a knob piece formed by the cut lines.

Incidentally, the cut line is generally provided so as to be orthogonal to the ridgeline of the wave of the core c of the corrugated board.

[Problems to be solved by the device]

By the way, in the fractured structure as described above, when the strength of the core is relatively larger than that of the liner, when attempting to tear it off with a sudden force or speed, as shown in FIG. The width of the gap cannot be maintained, and the tape is torn in a tapered state and cut during the break.

In addition, due to the wear of the cutting line blade and the defective receiving roll,
When the formed score line is not sufficiently cut, the above state is particularly likely to be reached.

Therefore, the problem of this invention is to ensure that even if it is attempted to tear it off, it can be reliably broken to the end.
It is to improve the fracture structure.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a liner on the back side of a corrugated board with parallel two intermittent cut lines, and a portion sandwiched by the cut lines is on the front side of the corrugated board. In the rupture structure of the corrugated board that is torn in the shape of a strip, a configuration is adopted in which the vicinity of the outer side is crushed from the back surface side along both the cut lines.

[Action]

In the corrugated board rupture structure configured as described above, since the strength in the vicinity of the outer side of both cut lines where the core is crushed is reduced, the core is ruptured along the crushed part. It is easy and the fracture state does not taper.

Also, when crushing the outside of both cut lines, the liner near the cut lines is pulled outward, and the part of the cut line between the cuts is torn, resulting in continuous cut lines and tearing. The resistance may decrease.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

As shown in FIG. 1, this fractured structure has a front side liner 1
1.In a corrugated board consisting of a core 12, a backside liner 13, two backside liners 13 are provided on the backside liner 13 in parallel with each other, and two lines of intermittent cut lines 14 are provided in parallel with each other. A pressing line 15 formed by squeezing from the side is provided.

Hereinafter, the canned beer packaging box shown in FIG. 2 that can be divided into upper and lower parts by the broken portion of such a broken structure will be described.

The packaging box is assembled from the blank shown in FIG.

This blank consists of a top wall 20, a side wall 30, a bottom wall 40 and a side wall 3.
0, the seam allowance 50 is successively provided via fold lines 81, 82, 83, 84, and end walls 60a, 60b divided into two are provided at both ends of the upper surface wall 20 and the lower surface wall 40 at both ends of the side wall 30. The flaps 70 are connected to each other via fold lines 85, 86, and 87, respectively.

When assembling a box from this blank, the upper wall 20 and the seam allowance 50 are fixed to form a body portion, and the divided end walls 60a and 60b are fixed to the flap 70 so that both ends of the body portion are fixed. Block.

The side wall 30 and the flap 70 connected to the side wall 30 are provided with a break portion 10 having the above-described structure so that they can be divided into upper and lower parts. The cut mouth that becomes 17 is formed.

Therefore, when the packaging box is opened, as shown in FIG. 2, the cut opening is pushed to form the tab piece 17,
When the knob piece 17 is pulled to the outside of the box, the box is divided into upper and lower parts.

Since the cut line 14 and the pressing line 15 in the breaking portion 10 are formed in separate steps, a gap may occur between them. Therefore, if the pressing line 15 is provided outside the cut line 14 by about 5 mm in advance,
It is preferable that one pressing line 15 can be prevented from entering between the cut lines 14 even when a shift occurs.

〔effect〕

As described above, the breaking structure of the present invention adopts a configuration in which the vicinity of the outside is crushed along the cut line provided on the backside liner of the corrugated board, so that the strength of the crushed portion is reduced. For this reason, even when an attempt is made to rupture with a sudden force or speed, the tear resistance of the core is weakened along the crushed portion, and it is possible to reliably rupture to the end without tearing.

In addition, when crushing the vicinity of both the cut lines, the cut lines that extend intermittently may be torn to form continuous cut lines, which is also advantageous in that breakage is more likely to occur.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment according to the present invention, FIG. 2 is a perspective view showing a packaging box adopting the above embodiment, and FIG. 3 is a plan view showing a blank for assembling the packaging box. FIG. 4 is a perspective view showing a conventional example. 10 …… Break, 11 …… Surface liner, 12 …… Center core, 13…
… Liner on the back side, 14 …… Cut line, 15 …… Pressing line, 16 ……
Cut, 17 ... Knob piece, 20 ... Top wall, 30 ... Side wall, 40
…… Bottom wall, 50 …… Glue margin, 60a, 60b …… End wall, 70 ……
Flap, 81, 82, 83, 84, 85, 86, 87 ... Fold line.

Claims (1)

[Scope of utility model registration request] 1. A corrugated board in which a liner on the back side of a corrugated board is provided with two intermittent cut lines in parallel, and a portion sandwiched by the cut lines is torn in a strip shape on the front side of the corrugated board. A broken structure of a corrugated board, characterized in that, in the broken structure of the board, the vicinity of the outer side is crushed from the back surface side along both the cut lines.