JP2000318067A - Corrugated fiberboard with pitch line and method for giving pitch line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give a balanced pitch line with easy division and small decease in a strength at a corrugated fiberboard. SOLUTION: In the corrugated fiberboard 1A having front and rear liners 2, 4 and a corrugating material 3, pitch lines having different shapes, sizes and pitches are given to raw materials for either the liner and the material according to thickness of the fiberboard and thickness and hardness of its constituting material, the material for the corrugating material is corrugated, then the liners are sequentially pasted, and laminated to the corrugated fiberboard with balanced pitch lines easily divided with small decrease in the strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated cardboard with a dividing line, in which different dividing lines are given to the front and back liners and the material of the core in the manufacturing process of corrugated cardboard, and then glued and bonded. And a dividing line providing method.

[0002]

2. Description of the Related Art Hollow paper called corrugated cardboard is hard (hereinafter referred to as corrugated cardboard) and soft (hereinafter referred to as corrugated cardboard), and both have a buffering function. The former is mainly a container and the latter is a packaging material or a buffer. Used as a material. Containers are diverse and are divided into one-piece, two-piece and three-piece, and further subdivided. Among them, one-piece type with a capacity of about 10 to 40 kg, which is discarded after one to several uses, is particularly common. Is done.

[0003] Since corrugated paperboard for containers is vulnerable to bending, it is cut into a required length, punched into a required shape, and then repeatedly bent and bonded to form a container. Placed in a small folded state for At the time of use, the bottom is opened and the lid is sequentially closed after the body is formed by raising the body from the folded state, and sealed with an adhesive, a stapler, a tape, or the like to finish the container. Corrugated cardboard for cushioning material is wound into a roll and reprocessed to the required size.

[0004] In this type of container, even if the lid is opened, only the surface of the stored item is visible, so that it is indispensable to take the time for putting in and out of the display arrangement. Therefore, in the foodstuffs field, it is necessary to display such items as favorite items such as beverages and confections, daily items such as vegetables and fruits, and daily items such as seasonings. Container is not suitable. For this reason, many containers are used in which a dividing line consisting of discontinuous cuts is put around the trunk in advance and cut off without opening the lid, and the contents are displayed and taken in and out in the stored state.

[0005] There are two types of means for applying a dividing line only to the liner material on the surface at the initial stage of the production of corrugated cardboard, or to apply it after finishing the corrugated cardboard. The former is applied by continuous processing using a rotary blade, and the latter is applied by continuous processing using a rotary blade or intermittent processing in which a linear cutting blade having a finite width is moved up and down. Further, a dividing means in which a synthetic resin cut tape which is difficult to stretch and hard to cut is internally applied to the dividing position is also used.

[0006] Divided containers made of corrugated paperboard rarely use penetrating dividing lines except for specific purposes. The reason for this is that the use of a penetrating parting line facilitates the parting, but at the same time, the strength of the surroundings along the parting line is greatly reduced, and the appearance is deteriorated due to deformation of the core. For this reason, container damage easily occurs due to uneven storage and rough handling during the movement process,
In addition, opening the parting line usually requires power and effort.

Japanese Patent Application Laid-Open No. Hei 7-52086 discloses a device for applying a dividing line to corrugated paperboard. The point is that when the corrugated paperboard is placed on the rotary blade and the dividing line is formed on the liner surface, the positional relationship between the presser roll and the rotary blade is changed to prevent excessive pressing force from acting on the corrugated paperboard, and the rotary blade is placed on the paper surface. This is a content of a technique for restricting a cutting amount while cutting diagonally.

[0008]

SUMMARY OF THE INVENTION In the food field, luxury goods, daily goods and specific daily necessities are selling fast, and instead of taking out the contents from the containers and arranging them on an exhibition stand, a temporary display of a split type container is provided. Used as a stand. This container gives priority to preventing strength reduction due to excessive cutting of the cutting blade and deterioration of appearance due to deformation of the connection part of the liner and the core when giving the dividing line, and the dividing line is stopped to the extent that it penetrates the surface layer of corrugated paperboard Difficult to divide.

A container provided with a dividing means using a dividing line or a cut tape is provided with a window for displaying each starting point, but in any case, the dividing of the container requires considerable power and labor, and furthermore, the dividing line is required. Irrespective of the dividing means attached to the container, a cutter knife is used as the dividing means, since it leaves a trace of tearing on the surface without the surface and impairs the appearance. Such a response is due to the fact that there is little manpower and a sufficient amount of work time cannot be avoided.

[0010] The division by the cutter knife may damage the stored items, and the operator himself may not be able to be damaged, which is not a preferable means. The reason why the division of the container is difficult is that the amount of cut of the dividing line to be given to the corrugated paperboard is insufficient, giving priority to the prevention of the strength reduction, and the balance between the strength reduction and the easy division is not taken. Also, the application of the dividing line to the corrugated paperboard by the rotary blade makes it difficult to adjust the cut amount, and at the same time, the shape of the core is partially crushed and the appearance is impaired.

If a dividing line is provided by a finite linear cutting blade that moves in the vertical direction, the liner is completely cut off on the entry side of the cutting blade and loses its strength, and the cut portion is supported by a core for the purpose of cushioning. become. Therefore, when the cut amount is increased to the center, division becomes easy, but the strength of the container weakens due to the effect of the decrease in strength, and the container breaks during use, causing a phenomenon in which stored items pop out.

The apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-52086 enables processing from the surface of corrugated paperboard, and in particular, determines the position of a dividing line in consideration of a printed pattern after required printing. Although there is an advantage that can be given, the addition of the dividing line stops only on one liner and a part of the core, so that the strength can be prevented from decreasing, but when the thickness of the corrugated paperboard increases, the dividing line becomes easier and the working time is shortened Is difficult to provide.

[0013]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems relating to the dividing line, reduces the strength reduction around the dividing line, makes it easy to divide the cardboard with the dividing line, and provides the dividing line. The purpose is to provide a method.

According to the present invention, there is provided a corrugated cardboard comprising a front / back liner and a core, wherein the pitch, size and shape of the dividing lines provided to the liner and the core differ from each other. With cardboard. In the manufacturing equipment for corrugated cardboard composed of the front / back liner and the core, at least two parting devices are arranged between or between the tensioning devices near the material rewinding device for each component, and Using a dividing line applying device, a dividing line with a different pitch, size and shape consisting of a cut part and a non-cut part is given to either the front or back liner and the core material, and stepped to the core material And forming a core by performing a gluing step on the front and back liners to form a corrugated cardboard with dividing lines.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The requirements for a split type container are as follows:
In addition to satisfying the storage function, the balance between the strength retention along the division line and the ease of division is good. The present invention considers the shape and overlap of the dividing lines given to the corrugated paperboard to be the keys to balance, and provides a dividing line for each constituent material of the corrugated paperboard and pastes it, and at that time, changes the positional relationship of the holes arbitrarily. A well-balanced dividing line is formed.

The present invention relates to a corrugated cardboard manufacturing apparatus, in which a liner and a core material are fed out from a rewinding machine before various processes such as stepping and gluing are performed. Dividing lines with different conditions (pitch, size, shape, etc.) are given, dividing lines and stepping are added to the core material, and glued and pasted to either the front or back liner with the dividing lines sequentially Cardboard paperboard. The feature of this processing is that the dividing line between the liner material and the stepped core material is different,
That is, the degree of overlap of the dividing lines can be selectively adjusted in both the length and width directions.

When the cut portion of the core is positioned between the heights H of the core during bonding, the crushing or the like which is likely to occur at the connection between the liner and the core when the corrugated paperboard is directly cut with a rotary blade. There is no deformation and no loss of appearance. Each length of the liner cut portion of the side of the dividing line L ₁ and the non-cutting portion L ₂ is preferably in a range between 5~40mm the former 15~25mm
From the range, the latter in the range of 1 to 10 mm, preferably 1 to 10
Each is selected from a range of 5 mm, more preferably a range of 1 to 2 mm (see FIG. 2).

The pitch of the dividing line of the core may be selected in consideration of the conditions such as the thickness of its own wave and corrugated paperboard, the hardness and thickness of the constituent materials, and also the weight of the container storage. Even better. Or 0.2 to 0.8 times the range of the cutting portion L ₃ is the height H by the corrugated medium preferably selected from the range of 0.4 to 0.6 times. Also not particularly need to match the center of the cut portion L ₃ to the height midpoint (see Fig. 2), for example, or placed in the point of contact with the liner granted dividing line, arbitrarily in consideration of the expansion and contraction of paper Position.

Since the type of the dividing line can be freely selected for the liner and the core, it is possible to provide the dividing line under the optimum condition according to the condition of the corrugated paperboard. Therefore, a split type container produced from such a corrugated paperboard with a splitting line has a small balance in strength and has an excellent balance for easy splitting. The allowable value of the overlap deviation W in the width direction of the dividing line opened for each material at the time of bonding is ±
It is selected from a range of 3 mm, preferably a range of ± 1 mm, more preferably a range of ± 0.5 mm (see FIG. 4).

The cross-sectional shape of the corrugated paperboard made of the material to which the dividing line is provided in such a manner is more in comparison with the state in which the corrugated paper is cut into a part of the core by the conventional method. In spite of the fact that the total length of the cut part of the line has increased compared to the case where only the liner is applied, the increase in strength around the dividing line has been stopped within the range that does not hinder the container, and division has been facilitated. .

The dividing lines are given to all of the liner and the core constituting the corrugated paperboard, or to the combination of the liner and the core on either the front or back, so that different types of dividing lines from penetrating type to non-penetrating type are provided. It becomes possible to finish corrugated paperboard. Such a dividing line can be applied not only to the corrugated paperboard but also to the entire corrugated paper including corrugated paper used as a cushioning material.

The corrugated paperboard with a dividing line according to the present invention has a reduced strength around the container along the dividing line, facilitates division, improves work efficiency, and eliminates the need for a cutter knife.
In addition, corrugated paperboard with a non-penetrating parting line is divided so that the outside without the dividing line is wound inward when dividing, so a ruled line is inserted along the direction of the dividing line on the outer surface of the liner without the dividing line. If you keep it, the trace of tearing is less likely to remain during splitting, and the appearance has improved.

[0023]

According to the present invention, in the case of using a corrugated paperboard as a dividing type container, different dividing lines are provided for each material at an initial stage of the production of the corrugated paperboard, and the strength is small after gluing and bonding. This enables the formation of a dividing line with the following characteristics.

[0024]

[Embodiment 1] In this embodiment, a cardboard with a dividing line and a dividing line providing method will be described. FIG. 1 shows a flow sheet of a manufacturing facility for forming the corrugated cardboard 1. The front and back liners 2 and 4 are supplied from rewinding devices 5 and 7 equipped with a material, and the rewinding device 6 is similarly equipped with the material. The stepped core 3 is supplied and the three are glued and bonded. In the section of the tensioning device 9 near the rewinding device of the manufacturing facility, devices 10, 11, and 12 for adding a dividing line to each material corresponding to the front and back liners 2, 4 and the core 3 are added.

In the pasting of the materials, the material for the front liner 2 after passing through the dividing line applying device 10 is attached to the dividing line applying device 11.
And the place where the material for the core 3 immediately after exiting the stepped roller 8 and the material for the back liner 4 after passing through the dividing line applying device 12 are combined with the material for the core 3 after integration. Perform each at the place where the material for the front liner 2 meets. Each of the dividing line providing devices has a built-in function of finely adjusting the rotation speed (not shown) and finely adjusting the position of each material in both the thickness and width directions (not shown) as necessary.

FIG. 2A shows the dividing line providing devices 11 and 12.
Is an enlarged cross-sectional view taken along a parting line of a corrugated paperboard 1A having a thickness of about 5 mm, which is bonded after applying a parting line for each material by moving the. The dividing line formed on the back liner 4 and the core 3 is different,
The former is a length L ₁ to 2mm pitch of the uncut portion 4B length L ₂ to 18mm cut portion 4A, the latter is the length of the cut portion 3A L
₃ was set to 0.5 times the height H of the core 3, the cut portion 3A was arranged at a pitch in the middle of the height H by the core, and the non-cut portion 3B was arranged closer to the liner. Compared with the method of directly cutting corrugated paperboard with a rotary blade, the connection between the core 3 and the back liner 4 is not deformed and the appearance is not impaired.

Since a dividing line different from that of the back liner 4 is provided and bonded to the core 3, the total length of the cut portions of the dividing line of the core 3 is enlarged, and the resistance at the time of division is appropriately reduced so that the division is performed. Made easy. As shown in FIG. 2 (B, C) [a cross-sectional view along the line aa, bb in FIG. 2 (A) and a cross-sectional arrow view], a dividing line cut portion of the core in the thickness direction of the corrugated paperboard 1A. Thus, it was possible to provide a well-balanced parting line which alleviated the bias of the cut portion in the thickness direction, reduced the strength reduction and was easy to divide.

FIG. 3 shows a combination of a rotary blade 13 lacking a part of the circumference and a roll 14 having a blade receiving groove.
12 is provided in the dividing line applying device 11 and a dividing line is applied to the liner and the core by using a rotary blade 13 having a different blade pitch and shape for each applying device. Since the rotary blade is synchronized with the feed speed of the material, the material needs to be sufficiently taut and contact the rotary blade in order to obtain a clean cut surface. When a plurality of dividing lines are required, a plurality of rotary blades 13 may be increased in the axial direction via a spacer. Further, when the processing side is fixed to one of the dividing line applying devices 10, 12, only the corresponding side may be provided.

FIG. 4 shows an allowable value W which schematically shows an overlapping displacement in the width direction caused when a dividing line applied to the liner and the core material before becoming the corrugated paperboard 1A is bonded. In this case, it was set within a range of ± 1.0 mm with respect to the center line cc of the cut portion 4A of the back liner 4. The range of this W is preferably small in a non-penetrating parting line, and large in a penetrating type in which a dividing line is provided on both the front and back liners and the core.

[0030]

Embodiment 2 FIG. 5A shows the front liner 2 shown in FIG.
5B (a cross-sectional view along line d-d in FIG. 5A) is applied to the outer surface of the corrugated paperboard 1B by a forming roll in accordance with the dividing line. The operation of separating the container is such that the end of the dividing line is held and the dividing line side is wound outward and the opposite side is wound inward.
When there is a ruled line 2A of a character, it is relatively easy to tear and a trace is hardly left. In this example, the cross-sectional shape of the ruled line is V-shaped, but may be square or semicircular. The ruled line may be a combination of the rotary blade and the grooved receiving roll of any of the dividing line applying devices 10 and 12 shown in FIG. What is necessary is just to replace with a disk-shaped forming roll and a receiving roll.

[0031]

Comparative Example 1 FIG. 6A is an enlarged cross-sectional view of the corrugated paperboard 21 in which the pitch of the dividing line and the pitch of the core wave coincide with each other, and FIG. 6B is a sectional view taken along line ee in FIG. Core 2 generated when a dividing line is directly applied to the rotary blade in the sectional view taken along the arrow in FIG.
3 is shown. It is impossible to selectively cut out the back liner 24 with the rotary blade in the state of corrugated paperboard. In most cases, the back liner 24 and the connection portion 27 between the core 23 are cut out, and the connection portion is cut at the time of cutting. Since it is crushed and deformed as indicated by a dotted line 28, the periphery of the dividing line is depressed and the appearance is deteriorated.

In the pitch consisting of the cut portion 25 and the non-cut portion 26 constituting the dividing line, when the cut portion is desired to be long, the blade surface (circumferential length) of the rotary blade is lengthened. However, the counter roll of the rotary blade receives the pressing force via the center core 23, so that it is difficult to finely adjust to avoid excessive cutting. For this reason, when corrugated paperboard is directly processed by the rotary blade, the range of selection of the shape of the dividing line is limited.

[0033]

[Comparative Example 2] Corrugated paperboard 3 in the final step of cardboard production
No. 1 cannot be wound into a roll like corrugated paper, so it is cut to a required length and stacked. Accordingly, for a certain length of corrugated paperboard, a method of intermittently moving a tool 35 having a finite and straight cutting edge 36 as shown in FIG. . FIG. 7 (B) shows the corrugated paperboard 31 in which a dividing line is inserted.

The processing by the tool 35 does not deform the connecting portion 37 between the back liner 34 and the core 33. However, since the back liner 34 and a part of the core 33 become a continuous cut surface completely separated, The strength of this portion is supported by the front liner 32 and the rest of the core, which facilitates division, but greatly reduces the strength. In addition, since it is an intermittent operation, even if it is possible to process corrugated paperboard, its application to corrugated paperboard is inefficient and cannot be said to be suitable.

[0035]

The following effects are obtained by providing the dividing line according to the present invention. This makes it possible to impart a balanced dividing line to the corrugated paperboard for containers with a small reduction in strength and easy division. The container made of corrugated paperboard with a dividing line was easy to divide, and the damage due to movement and the like was comparable to that of the container without the dividing line. Depending on the thickness of corrugated paperboard and the hardness and thickness of the components,
Allows selection of the desired parting line for the container. The appearance of the split surface has been improved. Traces of tearing were made inconspicuous by the ruled lines.

[Brief description of the drawings]

FIG. 1 is a flow sheet of equipment for manufacturing cardboard.

FIG. 2 shows corrugated paperboard in which one of the liner and the core is provided with a different dividing line, (A) is a cross-sectional view along the dividing line, (B) and (C) are aa and b in (A). It is sectional drawing and sectional arrow view along each line of -b.

FIG. 3 is a combination diagram of a rotary blade and a receiving roller lacking a part of the circumference.

FIG. 4 is a cross-sectional view schematically showing a widthwise shift of a cut portion in the thickness direction of the corrugated paperboard with respect to the line cc.

5A and 5B show a corrugated paperboard provided with a ruled line on the other liner of FIG. 2, wherein FIG. 5A is a cross-sectional view along a dividing line, and FIG. 5B is a cross-sectional view along a dd line of FIG.

FIG. 6 shows corrugated paperboard directly processed by a rotary blade;
(A) is a cross-sectional view along the dividing line, (B) is ee of (A).
FIG. 3 is a sectional view taken along a line.

7A and 7B show corrugated paperboard directly processed by a linear tool, FIG. 7A is a front view of the linear tool, and FIG. 7B is a cross-sectional view of the corrugated paperboard processed by FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugated cardboard 1A, 1B Corrugated paperboard 2 Front liner 2A Ruled line 3 Core 3A, 4A Cutting part 4 Back liner 3B, 4B Non-cutting part 5, 6, 7 Rewinding device 8 Stepping roll 9 Tensioning device 10, 11, 12 Parting device 13 Rotating blade 14 Receiving roll

Claims (9)

[Claims] 1. A front / back liner (2, 4) and a core (3).
(1) The corrugated cardboard (1, 1A, 1B), wherein the pitch, size and shape of the dividing lines provided to the liner and the core are different from each other. 2. Front and back liners (2, 4) and a core (3)
2. A corrugated cardboard with a dividing line according to claim 1, wherein a dividing line is provided on one of the liner and the core in the corrugated cardboard (1, 1A, 1B). 3. A front / back liner (2, 4) and a core (3).
2. A corrugated cardboard (1, 1A, 1B) composed of: (1) a dividing line is provided on one of the liners and the core, and a ruled line (2A) is provided on the other liner. Cardboard with dividing line. 4. A front / back liner (2, 4) and a core (3).
In the corrugated cardboard (1, 1A, 1B) constituted by the above, the length of the cut portion (3A) constituting the dividing line of the core (3) is 0.2 to 0.8 times the height of the core. The cardboard with a dividing line according to any one of claims 1 to 3, wherein the cardboard is selected from a range. 5. A front / back liner (2, 4) and a core (3).
In the corrugated cardboard (1, 1A, 1B) composed of the above, the intermediate point in the length direction of the cut portion (3A) constituting the dividing line of the core (3) matches the intermediate point of the height of the core. The cardboard with a dividing line according to any one of claims 1 to 4, wherein: 6. A front / back liner (2, 4) and a core (3).
In the corrugated cardboard (1, 1A, 1B) composed of the above, the midpoint in the length direction of the cut portion (3A) constituting the dividing line of the core (3) is the contact point with the liner including the dividing line. The corrugated cardboard with a dividing line according to any one of claims 1 to 4, wherein the corrugated cardboard has a matching structure. 7. Front and back liners (2, 4) and a core (3)
In the cardboard (1, 1A, 1B) composed of
Overlapping deviation in the width direction of the dividing line or the ruled line given to any of the back liner and the center is kept within ± 3 mm of the other dividing line or the ruled line in the width direction around the liner dividing line. The corrugated cardboard with a dividing line according to any one of claims 1 to 6, wherein 8. A front / back liner (2, 4) and a core (3).
In the manufacturing equipment for corrugated cardboard (1), at least two parting lines are provided between the tensioning device (9) or the tensioned portion near the material rewinding device (5, 6, 7) for each component. The devices (10, 11, 12) are arranged, and the pitch, size and shape of the cut and non-cut portions are applied to the liner and the core material on either the front or back by the dividing line applying device. A dividing line applying method, wherein different dividing lines are provided, stepped on a material for the core to form a core, and then sequentially glued and bonded to the front and back liners to form a cardboard with a dividing line. 9. A front / back liner (2, 4) and a core (3).
In the manufacturing equipment of the corrugated cardboard (1) constituted by the above, one of the dividing line applying devices (10, 12) is used as an applying device of the ruled line (2A), and the dividing line is provided on one liner and the center. 9. The dividing line applying method according to claim 8, wherein a ruled line is added to the other liner.