JPH10218167A - Carton having zipper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable unsealing along the zipper line to the last irrespective of the direction of the zipper line or the tearing direction by forming the cut of the zipper provided on a prescribed part of a carbon of the Y-shape comprising a straight line part and two abbique line parts extending straight from one end part of the straight line part. SOLUTION: A zipper J comprising Y-shaped cuts including one straight line part and two abbique line parts extending straight from one end part thereof are arranged in curved shape symmetrical in the right-to-left direction with the prescribed pitches is provided on each side of an unsealing region of a top plate in a carton 20 having the zipper. When a knob piece T is lifted by zipper J, the cutting line of the affique line part of the next cut to receive it is waiting, even when the direction of the shear stress to be exerted on the final point of the Y-shaped straight line is deviated in either right or left direction, and the tear of a connection part is to the Y-shaped cut one after another, and unsealing is realized along the zipper line beautifully to the last.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carton provided with a zipper for easy opening.

[0002]

2. Description of the Related Art Hitherto, zippers have been frequently used to open a carton, particularly a body or a top plate of a seal end carton into a predetermined shape. FIG. 5 is an explanatory view of a conventional carton with a zipper. FIG. 5 (a) shows a case of a carton 30-1 with a zipper in which the front plate and the top plate are opened with a S-shaped zipper J and the knob piece T is continuously opened, and FIG. Zippered carton in which a lid (not shown) swings by a hinge (not shown) of the rear plate by horizontally tearing from the tab T with the L-shaped zipper J running and separating both side plates at the perforation M. 30-2. These zippers J
Are formed by short cutting edges according to the shape of the cuts that make up the zipper together with the pressing and punching blades in the carton punching process. In the carton punching process, a punching die in which the pressing rule and cutting edge are embedded in the base plate as shown in the development of the carton blank, and a female die (press board on the counter plate) that receives the punching die are set in a punching machine so as to face each other. Attach and process by applying pressure across the paperboard between the two. There are two types of punching machines: flat pressure type and rotary type. For long-run work, both die type and female type rotary type machined into a cylindrical shape are used. However, it is very costly and is only used for cartons with limited mass production. Therefore, the zipper-equipped carton according to the present invention is premised on the versatile flat-pressure processing. In the case of the flat pressure type, the punching die engraves a groove in the base plate on which plywood with a thickness of 18 mm is laminated with laser light output according to the carton blank drawing or according to the digital data of the carton blank figure, and one side in it. It is manufactured by embedding a strip-shaped steel plate that has been processed into a creasing rule, cutting edge, or the like. The zipper J is machined by a short cutting edge, and the cutting edge forms an L-shaped or S-shaped cut, which is arranged in a line in the tearing direction of the zipper J. This cutting edge is finished by sharpening one end of a strip-shaped steel plate having a thickness of 0.7 mm and a width of 23.6 mm, bending it into an L-shape, an S-shape or the like, quenching or the like.

[0003]

However, the conventional FIG.
In the case of opening with a zipper J in which L-shaped or S-shaped cuts are arranged as shown in, the gripper T of the carton is picked with a finger and correctly opened in the direction of the zipper line, and can be opened without problems if opened carefully. If the direction of pulling is deviated to the left or right, the propagation of tears will not be passed on to the zipper cuts correctly one after another, the zipper line will be detached from the middle and opening will be impossible, In many cases, the delamination of the paperboard spreads from the place where it was cut. In addition, when the carton is torn into strips as shown in FIG. 5B, there is a problem that the strips are torn off in the middle. This phenomenon occurs when the wrist is used in an unusual manner in use, and particularly when the zipper line draws a curve. The basis weight often used for cartons is 160 g / m
^{In the case of two} or more coated balls or the like, since five to six layers are laminated at the time of paperboard making, the delamination of the paperboard tends to spread from a place where the tear is off the zipper line.
When this phenomenon occurs, it is necessary to cut off the adhered delaminated portion again from the zipper, which is bothersome, and there is a problem that the separated zipper and its surroundings deteriorate the aesthetic appearance. The present invention has been made in view of the above-described problem, and even if the tear direction does not coincide with the zipper line due to a crazy hand when the zipper is torn, and even if the curved zipper line, the curve of the curve It aims to provide a carton that can be opened along the zipper line to the end regardless of the direction.

[0004]

According to the present invention, there is provided a zipper formed by forming a plurality of cuts in a predetermined portion of a paperboard carton.
A carton in which a predetermined area of a carton can be opened by tearing a zipper, wherein the cut is formed by a straight portion and two oblique lines extending linearly from one end of the straight portion. The zipper is provided in a predetermined portion of the carton, wherein the oblique line portion of the cut is arranged at the start end in the opening direction, and the linear portion is arranged at the end side in the opening direction. In a predetermined part of the carton, the cuts are arranged in a straight line and the zipper is provided in a straight line.In a predetermined part of the carton, the cuts are arranged in a curved line, and the zipper is provided in a curved line. The angle formed by the two hatched portions of the cut is 30
° to 135 °, and the length of the straight portion of the cut is 1 to 4 times the shortest distance between the other end of the straight portion and the diagonal portion of another cut adjacent to the cut. It is constituted by.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is an explanatory view of a carton with a zipper according to the present invention. FIG. 1A is a perspective view, and FIG.
(B) is a partial exploded view of the carton blank and a dimensional diagram of an example sample. As shown in FIG. 1, a zipper-equipped carton 20 according to the present invention has a Y-shaped notch formed of one straight portion and two oblique lines extending linearly from one end thereof. Zippers J arranged in a curved pattern symmetrically at the pitch are provided on both sides of the opening area of the top plate. Therefore, when the knob T is lifted up by the zipper J, the top plate can be opened neatly in an elliptical shape.

FIG. 2 is an explanatory view of a tearing condition by a zipper. FIG. 2A shows the case of a conventional L-shaped zipper, and when the zipper is torn in a tearing direction (from top to bottom in FIG. 2A), the end point P of the vertical linear portion is shown.
When the direction of the shearing stress applied to in the direction of the left arrow, the connecting portion (the portion from the end point P to the next cutting line)
If the paperboard is torn while causing delamination and hits the cut line of the next cut, the delamination is terminated once, and a new tear is repeated from the next point P,
The tears propagate one after the other in the arrayed L-shaped cuts and can be torn along the zipper line. However, when the direction of the shearing stress acts on the right side as shown by the right arrow, there is no cut line for receiving the delamination occurring from the end point P, so that the delamination portion M as shown by the oblique line in the right diagram of FIG. It often happens that a file becomes so large that it cannot be opened. On the other hand, in the carton 20 with a zipper according to the present invention, as shown in FIG. 2 (b), even if the direction of the shear stress acting at the end point P of the linear portion is deviated to the left or right, it is received. Since the cut line of the hatched portion of the next cut is waiting, the delamination layer at the connecting portion starting from the end point P is always cut and does not increase as shown in the right figure, and the tear propagates successively to the Y-shaped cut. Then, it is possible to open the zipper line neatly until the end.

FIG. 2 (c) is an explanatory view of a suitable Y-shaped cut, and the angle α by two oblique lines is 30 °.
It is preferably in the range of ~ 135 °, desirably
60 ° to 90 °. Further, the length b of the linear portion is preferably in the range of 1 to 4 times, and more preferably 2 to 3 times, the shortest distance a from the point P to the next cut. These two are also correlated in the design of the notch, and only one of them cannot be freely changed. If the angle α or the shortest distance a is too large, delamination occurring from the end point P of the straight line portion cannot be caught, and it becomes impossible to rip.
Also, when the angle α and the shortest distance a are small, the tear resistance is reduced and the package is easy to open, but the carton zipper J
There is a problem of weakening the panel structure with the problem. Therefore, it is necessary to design the zipper in a preferable combination within the above range. Further, the size of the cut in the zipper may be appropriately determined according to the thickness of the paperboard. Generally, the thickness of the paperboard used for the carton is 0.3 to 0.6 mm. For example, in the case of a 0.5 mm thick paperboard (coated ball), at least the shortest distance a is 0.7 mm. Is necessary. The shortest distance a has a limit.
In a zipper punching die to be described later, at the stage of the die, 0.
This is because processing up to 2 mm is possible, but in the case of a product that has been actually punched out, the connecting portion will not be connected.

[0008] The reason why such a Y-shaped zipper could not be freely used until now is due to the manufacturing technology of a flat-pressure punching die. That is, as described above, in the punching die for a paperboard blank, all the cutting edges are formed by processing one side of an elongated strip-shaped steel plate, and the side opposite to the cutting edge is embedded in the groove of the base plate. Therefore, the greater the depth and length embedded, the more durable it is, and the cutting edge does not fall off the base plate when the cutting edge punched out of the paperboard is pulled out of the paperboard. However, if a Y-shaped notch is manufactured by a conventional method, a short cutting edge corresponding to one of the left and right portions of the hatched portion of the upper half of the Y-shape is embedded adjacent to the conventional L-shaped cutting edge. However, there is a problem that the embedment width is too small to drop out immediately. Therefore, in the case of the carton 20 with a zipper according to the present invention, a durable zipper punching die as described below is used.

FIG. 3 is an explanatory view of Embodiment 1 of a punching type of a Y-shaped zipper. First, as shown in FIG. 3, the punching die of the Y-shaped zipper according to the first embodiment is a continuous strip-shaped punching die A- having a conventional L-shaped cutting edge K on one side.
As shown in the plan view of FIG. 3, both of the continuous band-shaped punching dies B-1 each having a short cutting edge K ′ corresponding to any one of the 1 and Y-shaped hatched portions on one side, It is finished by being embedded in a base plate at a predetermined interval and curvature (not shown). The portion to be embedded is indicated by U. FIG. 4 is an explanatory view of a punching die of a Y-shaped zipper according to a second embodiment. The punching die of the Y-shaped zipper according to the second embodiment is not long as in the first embodiment, but the cutting edges K and K ′.
Two types of punching dies A-2 whose length is almost twice as long as
B-2 is assembled in a Y-shape in an arrangement as shown in the plan view and embedded in a base plate to finish.
Similarly, the buried portion is indicated by U.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
Example of a carton with a zipper according to the present invention having a thickness of 0 mm and a height of 30 mm was prepared by using a coated board made of Marui Paper Co., Ltd., having a coated ball of 310 g / m ² and a thickness of 0.36 mm. Using the punching blades of Example 1 and Example 2, 10 constituent units each having a size of 10 mm in length and 0.66 mm in width were arrayed so as to have a curvature of 100 mmR. On the other hand, except that the conventional L-shaped zipper was provided, all prototype samples were created with the same specifications,
A carton open comparison test was performed. The results of the tear-opening of both samples above show that in the case of the example sample, any opening method could easily open completely along the zipper line until the end, but in the prototype example, unless the zipper line was carefully opened, Could not be completely opened.

[0011]

According to the carton with the zipper according to the present invention, by providing the zipper having a Y-shaped cut in the periphery of the opening area, the zipper line can be formed according to the zipper line regardless of the habit of opening. Even a curve can be opened correctly and easily.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a carton with a zipper according to the present invention.

FIG. 2 is an explanatory view of a tearing state by a zipper.

FIG. 3 is an explanatory view of Embodiment 1 of a punching die of a Y-shaped zipper.

FIG. 4 is an explanatory view of a punching die of a Y-shaped zipper according to a second embodiment.

FIG. 5 is an explanatory view of a conventional carton with a zipper.

[Explanation of symbols]

Reference Signs List 10 Carton blank of zipper carton according to the present invention 20 Carton with zipper according to the present invention 30 Conventional carton with zipper P End point of straight part (in tearing direction) J Zipper K, K 'Cutting edge T Knob piece M Delamination part U Embedding part

Claims (6)

[Claims] 1. A carton provided with a zipper formed by forming a plurality of cuts in a predetermined portion of a paperboard carton so that the zipper can be torn to open a predetermined area of the carton. , The notch is
A carton with a zipper, which is formed in a Y-shape comprising a straight portion and two oblique lines extending linearly from one end of the straight portion. 2. The zipper is provided in a predetermined portion of a carton, wherein the oblique line portion of the cut is arranged at a start end in the opening direction, and the straight portion is arranged at an end side in the opening direction. A zippered carton according to claim 1, characterized in that: 3. The carton with a zipper according to claim 2, wherein the cuts are linearly arranged in a predetermined portion of the carton, and the zippers are provided linearly. 4. The carton with a zipper according to claim 2, wherein the cuts are arranged in a curved shape in a predetermined portion of the carton, and the zipper is provided in a curved shape. 5. The carton with a zipper according to claim 1, wherein an angle formed by the two hatched portions of the cut is 30 ° to 135 °. 6. The length of the straight portion of the cut is 1 to 4 times the shortest distance between the other end of the straight portion and the hatched portion of another cut adjacent to the cut. A carton with a zipper according to any one of claims 1 to 5.