JP2004216619A - Perforation for opening corrugated cardboard box and method and apparatus for forming the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a perforation for opening a corrugated cardboard box which is provided to the entire periphery of a packaging box manufactured from a corrugated cardboard sheet in order to facilitate the opening of the box, has an H-shaped start part at a cut-open start position and can start the cut-opening from the start part toward both sides, that is, has no directionality in opening. <P>SOLUTION: The perforation for opening the corrugated cardboard box is constituted by closely arranging three perforations on the corrugated cardboard sheet along a cut-off direction. Three perforations comprise a first intermittent perforation (21) in the direction inclined by an angle α relative to the cut-off direction, a second intermittent perforation (22) in the direction inclined by an angle -α relative to the cut-off direction and a third intermittent perforation (23) in the direction inclined by the angle α relative to the cut-off direction. The H-shaped cut-off start part (3) is provided on the way of the perforation (2). <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a perforation for opening a cardboard box and a method and apparatus for forming the same.
[0002]
[Prior art]
In a cardboard box that packs products such as canned beer and canned juice, a wrapping box, called a lapland case, is provided with an opening that runs in the circumferential direction on the side of the box. There is one that can open the side wall. When selling products, if the boxes are cut and opened to open, the boxes can be handled individually, but customers can place individual cans and bottles in or out of the boxes. It is convenient because it can be taken out.
[0003]
In order to easily open this type of box, for example, a tape for opening (stretched tape of polyolefin) is attached to the inner surface of the box so as to make a round around the box, and the tape is pulled. A method of cutting cardboard has been adopted. Instead of sticking the stretched tape, perforations may be made in the corrugated cardboard in advance.However, since the contents have a certain weight, the strength of the packaging box cannot be significantly reduced. The ratio between the length of the cut portion and the length of the non-cut portion cannot be too high. On the other hand, it goes without saying that the higher the ratio of cut portions, the easier it is to cut, and the harmony between the two is a problem.
[0004]
It is common practice to perforate only the back liner, instead of perforating the entire corrugated paper. This is a method in which the back liner is perforated with a rotary blade prior to laminating the back liner and the stepped core to produce a single-faced cardboard sheet with a single facer. In this method, the perforations are not visible on the surface of the packaging box and the appearance is excellent, but there are inherent problems. First, since paper generally expands and contracts under the influence of humidity, the perforation may be shifted in the width direction when a single-sided corrugated cardboard sheet is manufactured. If it is misaligned, a defective sheet will be generated, but this can be confirmed only after the corrugated cardboard sheet reaches the slitter / scorer (commonly known as "Srisco") device that cuts in the width direction and forms fold ruled lines. is there. Since the distance from a single facer to Slithco is as long as 100 m to 150 m, there is a risk of producing a large number of defective products.
[0005]
Another problem is that when the back liner is heated by the pre-heater, tension in the width direction acts on the back liner due to shrinkage, and there is a risk of tearing from the perforation. If the perforations are completely torn, the strength of the corrugated cardboard will decrease, and the packaging box will not have the required strength and will not be a commercial product. In recent years, the grade of corrugated cardboard has been reduced, and those having a low basis weight are often used, so that this problem is more serious.
[0006]
As a technology to prevent the occurrence of defective sheets caused by the above-mentioned widthwise deviation and to eliminate the problem that the perforations of the back liner are torn and the strength differs from the design value in principle, a cutter is installed inside the Slithco apparatus. An attempt was made to place and cut the back liner. This is to cut only the back liner continuously with a rotary blade, but the corrugated cardboard sheet is inevitably wavy, so it will not stop at the back liner and cut to the core corrugated part In that case, linear cracks are likely to occur, and the packaging box manufactured from the corrugated cardboard sheet has to be low in reliability (compressive strength is reduced), so that it is not practical.
[0007]
Easy opening is also required for cardboard cartons that do not require the strength of corrugated cardboard and provide relatively small or lightweight packaging. The unsealed portion of this type of carton is typically of the hakama type, in which two perforations running in parallel are provided and one end of each cut is bent inward. The opening direction of such an opening is determined, and the opening must be started from the side of the inward end, and if the opening is started from the opposite direction, the cut may be bent or interrupted in the middle. Roll around.
[0008]
Needless to say, it is preferable that the opening of the carton has no direction, and such a structure of the opening is required. As a response to the request, a short break perpendicular to the opening direction is provided at both ends of an intermittent long break running in parallel (Japanese Patent Laid-Open No. 10-11064), or a long break running in parallel between intermittent long breaks. There has been proposed a U-shaped cutout provided at the joint portion (registered utility model 3079649). However, these techniques are not suitable for implementation in a cardboard box.
[0009]
Even in a packaging box made of corrugated paper, it is desirable that there is no direction in opening. When the opening direction is one, in the above-mentioned lapland-type packaging box, the opening must be started from one end of the part to be opened and must extend to the other end, but the opening must be performed from the middle of the part to be opened. If you start and open both sides simultaneously, the efficiency of opening the package will increase.
[0010]
[Problems to be solved by the invention]
The object of the present invention is a perforation running on the side wall of a box, which facilitates opening of a packaging box made of corrugated cardboard, having an H-shaped starting part at the starting position of the opening, from which there is no direction, In other words, an object of the present invention is to provide a cardboard box opening perforation that can start to be opened toward both sides. It is also an object of the present invention to provide a method and apparatus for forming such a cardboard box opening perforation.
[0011]
[Means for Solving the Problems]
The perforation for opening a cardboard box of the present invention which achieves the above object is a sewing machine which is provided in advance over the whole or a part of the periphery of the box in order to cut and open a band-like portion from a cardboard box in which an article to be packaged is packed. Eye, as shown in FIG. 1, an intermittent first cut in a direction inclined at an angle α with respect to the cut direction along the cut direction for opening with respect to the corrugated cardboard sheet (1). (21), an intermittent second cut (22) in a direction inclined by an angle -α, and an intermittent third cut (23) in a direction inclined by an angle α are arranged close to each other. An H-shaped cutting start portion (3) is provided in the middle of the perforation (2).
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The method of forming a perforation for opening a corrugated cardboard box of the present invention is such that, prior to punching a blank of a corrugated cardboard box for packaging from a corrugated cardboard sheet, a plurality of knives are radially attached to a rotating piece so that the blade edge forms a circumference. The first cutter wheel whose tip is inclined by an angle α with respect to the traveling direction, the second cutter wheel inclined by an angle −α, and the third cutter wheel inclined by an angle α, The corrugated cardboard sheet is placed at an appropriate distance in the width direction of the corrugated cardboard sheet, and the knife wheel is rotated while being pressed against the corrugated cardboard as the corrugated cardboard sheet travels. An intermittent first cut in an inclined direction, a second intermittent cut in a direction inclined by an angle -α, and an intermittent third cut in a direction inclined by an angle α are formed in the corrugated cardboard sheet. From doing That.
[0013]
The apparatus for forming a perforation for opening a corrugated cardboard box according to the present invention is a blade wheel as shown in FIG. 4, that is, a plurality of blades (42) are radially attached to a rotating top (41) to form a circumferential edge. A first wheel in which the cutting edge is inclined by an angle α with respect to the rotation direction, a second wheel inclining by an angle −α, and a second wheel being inclined by an angle α. The third wheel is arranged so as to be located at an appropriate distance in the width direction of the traveling corrugated cardboard sheet, and as shown in FIG. A vertical moving means (5) for pressing and pulling apart is provided.
[0014]
The absolute value of the angle α or −α at which each cut is inclined with respect to the direction of the perforation (2) is selected from angles of 45 degrees or less. Usually, a range of 10 to 20 degrees is appropriate. Of course, the first cut and the second cut, and the second cut and the third cut are provided at the same interval. It goes without saying that, in addition to the inclination and interval of the cuts, the length of the cuts, the length of the joint between the cuts, and the like should be designed according to the cardboard packaging box to which the present invention is applied.
[0015]
As shown in FIG. 5, the arrangement of the first to third cutter wheels for making the first to third cuts in the corrugated paper is such that the first cutter wheel ( 4A), the second cutter wheel (4B) and the third cutter wheel (4C) may be arranged in a straight line, or, as shown in FIG. 6, the traveling of the traveling corrugated cardboard sheet. An array having a slight shift in the direction may be used. Of course, these eclectic arrangements are also possible. The blade wheel may be driven, but it is usually not driven, and it is advisable to configure the blade wheel to rotate at the same speed as the cardboard sheet travels, so that the blade bites into the cardboard sheet.
[0016]
The shape of the H-shaped cutting start portion (3) provided in the middle of the perforation may be the same as that of the conventional opening portion of this type, but as shown in FIG. It is preferable that
[0017]
Since the apparatus for forming perforations for opening corrugated cardboard boxes of the present invention is used after the corrugated paperboard manufacturing process is completed, as shown in FIG. 3, the Slithco apparatus (6) for producing blanks for packaging boxes. And it is the optimal position.
[0018]
【The invention's effect】
In the perforation for opening a corrugated cardboard box of the present invention, the H-shaped cutting start portion (3) provided in the middle of the perforation is pulled to both sides, so that the fractures are chained in the direction indicated by the arrow in FIG. . In other words, the first cut (21) and the second cut (22) are cut off on the left side of the H-shape in FIG. 2, and the second cut (22) and the third cut (23) are cut on the right side. Is cut off. As described above, the presence of the three cuts allows the cut-out portion to be slightly displaced up and down, but allows undirected opening.
[0019]
Since the perforation can be formed immediately before Slithco, there is no fear that the above-mentioned defective sheet is generated according to the present invention. The blades may wear when rotated and contacted at high speed with respect to the travel of the cardboard sheet, but according to the recommended embodiment of the present invention, the cutting tool pushes it off as the cardboard sheet travels without being driven. When used in such a manner, the degree of wear is much lower.
[Brief description of the drawings]
FIG. 1 is a plan view showing a perforation for opening a cardboard box according to the present invention.
FIG. 2 is a similar plan view showing a state in which a perforation for opening the cardboard box in FIG. 1 is opened.
FIG. 3 is a side view showing the entire configuration of an apparatus for forming a perforation for opening a cardboard box according to the present invention.
4 is a view showing one of the blade wheels used in the apparatus shown in FIG. 3, wherein A is a plan view and B is a longitudinal sectional view.
FIG. 5 is a conceptual view from above showing one mode of disposing three cutting wheels. The arrow is the direction of travel of the corrugated paper.
FIG. 6 is a conceptual diagram viewed from above, similar to FIG. 5, showing another mode of disposing three cutting wheels.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Corrugated cardboard sheet 2 Corrugated box opening perforation 21 First cut 22 Second cut 23 Third cut 3 Cutting start part 4 (4A, 4B, 4C) Cutting wheel 41 Rotating piece 42 Cutting tool 5 Vertical moving means 6 Slithco Device α (-α) Angle of inclination of cutting edge with respect to rotation direction

Claims (6)

A perforation provided in advance over the whole or a part of the periphery of the box in order to cut and open a band-shaped portion from the cardboard box in which the article to be packaged is packaged, and a cutting direction for opening the cardboard sheet for opening. Along, an intermittent first cut in a direction inclined by an angle α with respect to the cutting direction, an intermittent second cut in a direction inclined by an angle −α, and an intermittent in a direction inclined by an angle α. A corrugated cardboard box opening perforation, which is configured such that a typical third cut is arranged close to the perforation and an H-shaped cutting start portion is provided in the middle of the perforation. 2. The cardboard box opening perforation according to claim 1, wherein the angle α is an angle selected from the range of 10 to 20 degrees. Prior to punching a blank of a cardboard box for packaging from a cardboard sheet, a plurality of blades are radially attached to a rotating piece so that the blade edge forms a circumference, and the blade edge is inclined by an angle α with respect to the traveling direction. One cutter wheel, a second cutter wheel inclined by an angle -α, and a third cutter wheel inclined by an angle α are arranged at an appropriate distance in the width direction of the traveling cardboard sheet. In advance, as the blade wheel is rotated at the same speed while being pressed against the cardboard as the corrugated cardboard sheet travels, an intermittent first cut in a direction inclined by an angle α with respect to the traveling direction, A method for forming a corrugated cardboard box opening perforation, comprising forming, on a corrugated cardboard sheet, an intermittent second cut in a direction inclined by an angle -α and an intermittent third cut in a direction inclined by an angle α. . A plurality of blades are radially attached to the rotating top so that the blade edge forms a circumference, a first blade wheel in which the blade edge is inclined by an angle α with respect to the rotation direction, and a second blade inclining by an angle −α. The tool wheel and the third tool wheel inclined by the angle α are arranged so as to be located at an appropriate distance in the width direction of the traveling cardboard sheet, and these tool wheels are appropriately moved toward the cardboard sheet. An apparatus for forming a perforation for opening a cardboard box, comprising a means for pressing and separating by pressure. The apparatus according to claim 4, wherein the first to third cutter wheels are arranged in a straight line in the width direction of the traveling corrugated cardboard sheet. 5. The apparatus according to claim 4, wherein the first to third wheel wheels are arranged with a slight shift in the traveling direction of the traveling corrugated cardboard sheet.

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