JP2015189507A - Corrugated cardboard in which scheduled breaking lines for opening are provided by perforation processing, and device for perforation processing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated cardboard to be a material of a packing box, in which two scheduled breaking lines for opening are formed in parallel at a predetermined interval by forming perforations on a rear liner, and which prevents the split of connection portions of the perforations in a process of manufacturing, and can smoothly proceed with the opening of the packing box without a belt portion to be removed being cut in the middle when opening the manufactured packing box.SOLUTION: Each of two scheduled breaking lines A, B comprises two perforations 1, 2, 3, 4 running parallely and adjacently. Cutting portions 11, 21 of each perforation are provided to exist at positions corresponding to connection portions 12, 22 of the facing perforations. A device for perforation processing comprises a discoid blade having a slit for forming connection portions, and a receiving roll. The blade is configured by overlapping two unit blades.

Description

The present invention relates to a corrugated paper used as a material for a packaging box, which is provided with a perforation line for easy opening after filling the contents into a box and the perforation thereof. The present invention relates to an apparatus for performing processing. The present invention also includes a packaging box manufactured using the corrugated paper as a material.

As is well known, the largest use of corrugated paper is in packaging boxes, among which one-way boxes, that is, filling and sealing the contents, used for transportation and storage, after opening and taking out the contents In a type of box that is not reused, in order to make it easier to open the box, it is widely practiced to provide a scheduled opening line for opening by perforation. This planned fracture line is usually provided during the production of corrugated paper. Specifically, the core base paper that has been subjected to corrugation is bonded to the back liner, and then the front liner In the series of processes for manufacturing double-sided corrugated paper, two parallel perforations are placed in the back liner at a position determined according to the product packaging box design before the back liner is attached to the core. It is provided by applying.

As the name indicates, the perforation that is the planned breaking line for opening is the part where the liner is cut (hereinafter referred to as “cut part”) and the part where the liner is connected without cutting (hereinafter referred to as “connection part”). In order to form a perforation on the back liner, a circle with slits at regular intervals on the outer periphery of the circular blade is formed on the back liner on the receiving roll. This is done by making a cut by bringing the blade into contact. The opening where the opening is started, usually in the shape of a letter “H”, penetrates the perforated corrugated cardboard produced as described above into an appropriate location for opening the product packaging box. The H-shaped cuts are formed by pressing.

There are currently two technical problems associated with corrugated paper with perforations that are intended to be broken for opening. One is that the connecting part is cut off due to the shrinkage of the back liner, which occurs when the back liner is brought into contact with the preheater roll and preheated before bonding the back liner and the core with the adhesive. It is to end. The shrinkage of the back liner occurs both in the longitudinal direction and in the transverse direction, and the transverse shrinkage does not hinder, but the shrinkage in the longitudinal direction causes the connection portion to be cut. When the perforated joints given to the back liner are cut continuously, a clear tear occurs in the back liner, and when it is bonded to the center core, the corrugation of the center core can be seen from the split, so-called `` steps '' It is a "visible" fault. Needless to say, the portion where the step is visible becomes a strength weakness for the corrugated cardboard and causes non-uniform strength. Therefore, in the process of forming the packaging box with such an intermediate product, the packaging box Even when using, it may cause unexpected problems.

Another problem is that the opening of the packaging box made of corrugated paper does not always proceed smoothly even if the perforation can be prevented and a good perforation can be formed. Specifically, when opening is started from the above-mentioned H-shaped opening base, a strip-shaped cut portion according to a planned opening line formed by two opening perforations running in parallel is suddenly cut halfway. It is a fact that there is a case. Since the perforation is provided only on the back liner and not on the core and front liner, the fact that the band-like part is cut off when opened is due to the fact that the perforation is lower in strength than the other parts. Relying on. If the strength of the perforated part is clearly lower than that of the other parts, the opening operation can be facilitated and performed reliably, but the packaging box has a clear weak point in strength. Since this must be avoided, it is necessary to adjust the degree of strength reduction so that an appropriate balance can be obtained. In order for the opening operation to proceed smoothly, it is preferable that the force applied when cutting the strip-shaped portion is along the direction of the two perforations parallel to each other. When force is applied, the band-like portion is cut there.

The first object of the present invention is to bond the back liner and the core, which are perforated in the manufacturing process, in the above-mentioned first problem, that is, in the corrugated cardboard provided with the planned break line by perforation. It is an object of the present invention to provide a corrugated paper that prevents the connection portion of the perforation from tearing at the stage and seeing the step. It is also included in the first object of the present invention to provide an apparatus for use in the production of the corrugated paper.

The second object of the present invention is the above-described second problem, that is, when the packaging box is opened, the force applied to the band-shaped portion to be removed along the planned breaking line is slightly inclined with respect to the perforation direction. However, an object of the present invention is to provide a packaging box made of corrugated cardboard that can be smoothly opened without cutting the belt-like portion in the middle.

The corrugated paper that achieves the first object of the present invention is a corrugated cardboard in which two scheduled break lines for opening, in which cut portions and connecting portions exist alternately, are provided in parallel at a predetermined interval on the back liner. In the paper, as shown in FIG. 1 and FIG. 2, each of the two expected break lines (A, B) is composed of two perforations (1, 2; 3, 4) that run close to each other in parallel. The cut portions (11, 21; 31, 41) of the perforations are provided so as to exist at positions corresponding to the connecting portions (12, 22; 32, 42) of the perforations that face each other. To do.

The apparatus used for the production of the corrugated paper is as shown in FIG. 4 in the corrugated paper production process, and before the back liner (5) and the core (6) are bonded together, A device for providing a planned fracture line, which is composed of a blade (7) and a receiving roll (8), and the blade (7) has a disk shape as shown in FIG. (71) and by providing slits (72) at predetermined intervals, in a device configured to be able to alternately form cut portions and connecting portions, a disk-shaped blade is shown in FIG. As shown in the figure, two unit blades (7A, 7B) are stacked, and the blade portion of one unit blade is combined so as to correspond to the slit portion of the other unit blade. The two perforations for opening that are formed are two flats Consists Do proximate perforations, each cutting portion is characterized by being configured so as to present at a position corresponding to the connection portion of the opposing perforations.

A packaging box made of corrugated paper that achieves the second object of the present invention is a packaging box made of the above corrugated paper as a material, and two planned break lines (A, B) that run in parallel for opening. Are each composed of two parallel adjacent perforations (1, 2; 3, 4), and the cut portions (11, 21; 31, 41) of the respective perforations are connected to the connecting portions of the opposing perforations. (12, 22; 32, 42).

In the corrugated paper of the present invention, as shown above, two unscheduled breaking lines that run in parallel at a predetermined interval are each composed of two parallel perforations, and each perforation When the back liner is preheated prior to bonding with the core, it is shrunk due to the configuration in which the cut portion is provided at a position corresponding to the connecting portion of the perforation. This eliminates the problem that the connection part of the perforation is torn. As a result, it is possible to prevent the step of the manufactured corrugated paper from being seen and the perforation portion from becoming a strength weakness of the product packaging box.

Such an effect is that when the back liner contracts due to preheating, the tensile stress acting in the longitudinal direction is such that the two perforated cut portions (11, 21; 31, 41) and the connecting portion (12 , 22; 32, and 42) are absorbed by the “difference” portion, so that the connection portion does not cause disconnection.

The apparatus used for the production of the corrugated paper of the present invention is such that the blade (7) of the blade (7) and the receiving roll (8) constituting the cardboard is disk-shaped and the periphery thereof is polished as described above. In the apparatus configured to provide the blades and provide slits at predetermined intervals to alternately form the cut portions and the connection portions, the disk-shaped blade (7) has a plurality of unit blades (7A). 7B), and the blade portion (71) of one unit cutter exists at a position corresponding to the slit portion (72) of the other unit cutter, so that this type of conventional cutter is provided. The two perforations for opening, which could not be realized, consist of two parallel perforations, and the cut portions of the perforations exist at positions corresponding to the connecting portions of the perforations facing each other. Realized with conventional blades of this type The perforations did not come can give easily.

A packaging box made of corrugated paper according to the present invention is a packaging box having two planned break lines running in parallel for opening, each of the planned break lines being composed of two parallel perforations, Due to the feature that the cut part of the eye is provided at a position corresponding to the connecting part of the perforation facing, even if the direction of the force applied upon opening is slightly inclined with respect to the opening direction, the strip-like part to be removed is in the middle There is an advantage that opening can proceed smoothly without being cut. Since the conventional packaging box has only one on each side of the band-like part where the perforation for opening is removed, the force applied to the band-like part is not inclined, and the opening proceeds in the form of tearing the joints on both sides sequentially There was no problem as long as it was done, but when the tilt occurred, the band part might be cut or the cut might run sideways. This problem has been avoided by the present invention.

The top view which expanded and showed the typical example of the perforation for opening of the conventional corrugated paper used as the material of a packaging box. The top view which expanded and showed the cutting scheduled line for opening of corrugated paper according to this invention, Comprising: When the ratio of the cut part of a perforation and a connection part is equal to two. FIG. 3 is a plan view of the corrugated paper of the present invention similar to FIG. 2, wherein the ratio between the cut portion of the inner perforation and the connection portion is equal, but the outer portion has more connection portions than the cut portion. The side view of the principal part which shows the apparatus which manufactures the corrugated paper of this invention. The top view which shows the example about the shape of the cutter in the apparatus of FIG. It is sectional drawing which shows the structure of the cutter of FIG. 5, Comprising: A is a cutter for forming the perforation of FIG. 2, B and C are another structural examples.

The opening perforation provided on the corrugated cardboard used as the packaging box material is usually in the range of 12 to 15 mm between the two, and the length of the cut and connecting portions of the perforation. The length is selected from the range of 8 to 20 mm and 1.0 to 1.5 mm depending on the thickness and material of the corrugated paper used, the size and shape of the packaging box to be manufactured, and the weight of the contents. It was.

The planned breaking line for opening the corrugated cardboard that characterizes the present invention may be selected from the range of 12 to 15 mm as in the conventional case. Here, the “interval” refers to the pitch of each two perforations constituting the planned fracture line, that is, the distance between one outer side and the other inner side. The interval between the two perforations constituting each planned break line is suitably in the range of 0.6 to 1.2 mm. It is appropriate to select the length of the cut portion in each perforation from the range of 0.5 to 1.5 mm, and the length of the connection portion from the range of 0.8 to 1.8 mm. The ratio between the cut portion and the connection portion in the unit length of the perforation is suitably selected from the range of 1: 3 to 2: 1. Usually, the cut portion and the connection portion are approximately equal, or It is preferable to make the proportion of the connection part slightly longer.

FIG. 2 shows a case where the ratio between the cut portion and the connecting portion of the two perforations constituting the planned fracture line is equal to 1: 1, and the two are equal. On the other hand, in the case of FIG. 3, the outer one of the two perforations has a ratio of the cut portion to the connection portion equal to 1: 1, whereas the inner one has a ratio of the cut portion to the connection portion. Is 1: 2, and the ratio of the connected portion is large.

In the conventional perforation shown in FIG. 1, the length of the connecting portion is as short as 1.2 mm, whereas the cutting portion is 8.0 mm, and the entire perforation accounts for 87%. This is a selection with the expectation that the perforation part will surely work as a cutting line, but the fact that the connecting part is short and the ratio of the perforation over the entire length is small means that the perforation to the core This means that the stage is likely to appear due to the shrinkage of the back liner caused by the preheating. On the other hand, the two perforations shown in FIG. 2 have two perforations having continuous cut portions if they are assumed to have a center line between them, that is, a distance of 0.4 mm from each other. It can be said that it is divided into 0.4mm by left and right. In this case, the cut portion occupies 100%, but if the two perforations are seen, the connecting portion is long, and the ratio is also 50%. Therefore, the possibility of the connecting portion tearing due to the shrinkage of the back liner is shown in FIG. Much lower than perforations. Distortion due to shrinkage is absorbed by the connecting parts arranged in a zigzag pattern.

In the case shown in FIG. 3, the connection part: the cutting part is 3: 1 for the inner perforation, which is much larger than in the case of FIG. 2, so the connection part in the step of pasting the back liner and the core The possibility of tearing is further reduced. The high ratio of the connecting portions in the perforations acts even more advantageously when opening. That is, even when the force applied to the strip-shaped portion being removed is inclined, the cutting rarely proceeds beyond the outer perforation, and proceeds within the range of the outer and inner perforations.

On the other hand, in the case of a conventional blade having a diameter of 90 mm, the circumferential portion with the blade is divided into 16 equal parts, and 16.6 mm of 17.6 mm of 1 pitch is applied to the cut portion to connect. A typical example is that the portion is 1.2 mm. In this case, the ratio of the cut portion reaches 93%. In another example, the circumference is divided into 24 equal parts to 11.8 mm. In this case, the ratio of the cut portion is 90%. In these examples, since the ratio of the cut portion is large, the function of the planned break line formed on the corrugated cardboard is excellent, but the above-described drawback of “visible step” is likely to occur in the manufacturing process. According to the present invention, the intermittent line that is the planned break line is divided into two lines, and the ratio of the respective cut portions is low, so that no step is visible, while the planned break line in the product corrugated paper The function is fully retained.

Various configurations are possible for the configuration of the blade (7) forming the perforation. FIG. 6A is an example of a blade for forming the perforation of FIG. In the example shown in the figure, two unit blades having a thickness of 1.0 mm and the blade position deviated by 0.1 mm from the center in the thickness direction are combined with the eccentric side inside, and the perforation distance. Is set to 0.8 mm. In addition to this, a configuration in which the eccentric side is on the outside is of course possible, and a configuration as shown in FIG. 6B or C is also possible. And the angle 60 ⁰ of the cutting edge, is Aru points to a sharp angle, the same as the conventional blade of perforation configurations.

Two disc-shaped blade materials with a diameter of 90 mm and a thickness of 1.0 mm are prepared, and polished so that the cutting edge is positioned 0.1 mm from the center in each thickness direction. A blade-shaped unit blade material was obtained. Angle of the blade is 60 ^0. One unit cutter material is provided with a 1.0-mm slit, and the other one with a 0.5-mm slit, each having a pitch of about 1.0 mm, and 140 units are provided as unit cutters. Two sets of blades (7) having the configuration shown in FIG.

As the receiving roll (8), a steel round bar having a diameter of 180 mm was quenched and polished, and then hard chrome plating was applied thereto, which was attached to a rotating shaft. The apparatus shown in FIG. 4 including the blade (7) and the receiving roll was configured and assembled into a corrugated paper manufacturing apparatus. The distance between the two blades was 15 mm, and two perforations were formed at an interval of 12.8 mm.
With this apparatus, corrugated paper was produced as a packaging box material measuring 33 cm in length, 26.5 cm in width, and 13.5 cm in height to accommodate 30 round cans containing 250 g of drink.

In the process of corrugated paper production, no corrugation occurred on the back liner and the core bonded together. Necessary printing was performed on the obtained corrugated paper, and an H-shaped notch serving as an opening base was given by pressing, and then processed into a packaging box. In this packaging box, there is a planned opening break line in the middle of the height direction so as to make a round around the lateral surface and the end surface, and the H-cut that serves as a clue for opening is located at the center of both lateral surfaces. It is a design. When 30 round cans containing drinks were filled in this packaging box, packaged and then opened, removal of the belt-shaped portion could be smoothly proceeded.

A, B Unscheduled breaking lines 1, 2; 3, 4 Two perforations 11, 21; 31, 41 running in parallel to each other Cut sections 12, 22; 32, 42 2 of two perforations Perforation connecting portion 5 Back liner 6 Core 7 Disk-like blade 7A, 7B Unit blade 71 Blade portion 72 Slit portion 8 Receiving roll

Claims (7)

Corrugated cardboard used as a packaging box material, and on the back liner, two scheduled break lines for opening in which cut parts and connecting parts exist alternately are provided in parallel at predetermined intervals. Each of the two planned break lines (A, B) consists of two perforations (1, 2; 3, 4) that run close to each other in parallel. 21; 31, 41) is provided so as to be present at a position corresponding to the connecting portion (12, 22; 32, 42) of the perforation facing each other. The distance between the two planned break lines is 12 to 15 mm, the distance between the two perforations constituting each planned break line is 0.6 to 1.2 mm, and the length of the cut portion at each perforation The corrugated cardboard according to claim 1, wherein the length of the connecting portion is 0.8 to 1.8 mm. The corrugated paper according to claim 1 or 2, wherein the ratio of the length of the cut part of the two perforations and the connecting part is in the range of 1: 3 to 2: 1. The corrugated paper according to any one of claims 1 to 3, wherein the length of the cut portion of the two perforations and the length of the connection portion are substantially equal, or the ratio of the connection portion is longer. Of the two adjacent perforations on at least one of the two planned break lines, the ratio of the length of the connecting portion and the cutting portion located on the outside is the connecting portion on the inside perforation. The corrugated paper according to any one of claims 1 to 4, wherein the corrugated paper is larger than a ratio of a length to a cut portion. An apparatus for providing a scheduled break line for opening on a back liner prior to bonding of a back liner (5) and a core (6) for use in the production of corrugated paper according to claim 1, comprising: Is composed of a blade (7) and a receiving roll (8), and the blade (7) is disc-shaped and its periphery is polished to give a blade (71) and slits (72) are provided at predetermined intervals. Thus, in the apparatus configured to be able to alternately form the cut portions and the connection portions, the disk-shaped blade is formed by stacking two unit blades (7A, 7B), The two perforations to be formed are composed of two parallel perforations formed by combining the blade portions of the unit blades so as to correspond to the slit portions of the other unit blades, Connection of perforation where each cut part is opposite Device being characterized in that so as to exist in a position corresponding to min. It is a packaging box made of corrugated paper, and each of the two opening lines (A, B) for opening is composed of two parallel perforations (1, 2; 3, 4), A packaging box, wherein the perforated cut portions (11, 21; 31, 41) are located at positions corresponding to the perforated connecting portions (12, 22; 32, 42).

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