JPH0752086A - Device for forming breakage line on corrugated cardboard - Google Patents

Abstract

PURPOSE:To provide a breakage line forming device which can surely form a breakage line at a predetermined position and which can form a breakage line which can easily be broken. CONSTITUTION:A cutting blade roll 10 and a retaining roll 11 are rotatably arranged being opposed to each other. The cutting blade roll 10 comprises a pair of cutting blade members 17 each having an outer-peripheral knife edge, a pair of contact rolls 14 for limiting a cutting depth of the knife edges and making contact with a one side liner of a corrugated cardboard, and an intermediate roll having a diameter smaller than that of the contact rolls 14. The cutting blade rolls 10 and the contact rolls 14 are opposed to each other with a gap equal to the thickness of the cardboard. A corrugated card board is led between the cutting blade rolls 10 and the retaining rolls 11 so as to form a breakage line on a one side liner of the cardboard.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breakable line forming device for corrugated paperboard, for example, a breakable line provided for facilitating the opening of a corrugated cardboard packaging box formed by assembling corrugated paperboard. Related to the device.

[0002]

2. Description of the Related Art Generally, corrugated paperboard, which is a material for forming a packaging box, has a plurality of discontinuous cuts extending linearly in order to facilitate opening of the packaging box assembled from the corrugated paperboard. An H-shaped cut is formed at the breakable line and at the break start portion serving as a cut end of the breakable line so that fingers and the like can be freely inserted.

Usually, the breakable line as described above is formed only on the liner on the inner surface side of the packaging box. When a breakable line is provided on both the liner on the inner surface side and the liner on the outer surface side, the strength of the packaging box may be reduced by the breakable line, and the breakable line may be formed on the outer surface side of the packaging box. The liner is printed with a display of the make-up, the object to be packaged, and a guide for guiding the rupture start position of the rupturable line. When the rupturable line is formed on the liner on the outer surface side, the above-mentioned printing is performed. This may damage the aesthetics of.

Therefore, in order to provide the breakable line only on the liner on the inner surface side of the packaging box, the following steps are performed.

First, the first liner supplied from the mill roll stand is provided with a pair of disc-shaped rotatable cutting blade members having a plurality of cutting blades formed along the outer periphery thereof and facing the cutting blade members. And a pair of breakable lines are formed along the feeding direction of the first liner by passing between the rotatable pressing roll and the pressing roll. A corrugated roll is formed on a core supplied from another mill roll stand, and the corrugated roll is supplied. Next, the first liner and the core are bonded together. On the other hand, the second liner whose surface has been variously printed is supplied from another mill roll stand and further attached to the core.

In this way, a long strip-shaped corrugated paperboard having breakable lines formed on the first liner is formed.
Next, the corrugated paperboard is cut into a plurality of corrugated paperboards each having a predetermined size, and further, as shown in FIG.
Each corrugated cardboard board d is die-cut and formed for a packaging box, and an H-shaped cut q at the break start position of the fold line k or the breakable line p prints the second liner a. Formed as a reference.

However, as described above, the corrugated board d
When the breakable line p is formed on the first liner c in the previous step of forming the sheet, when the corrugated paperboard d is formed, as shown in FIG.
As shown in (b), an H-shaped cut q and a breakable line p
There may be a position shift between and. At this time, since the H-shaped cut q is formed with reference to the printing of the second liner a, the H-shaped cut q and the print corresponding to the H-shaped cut q do not deviate, H-shaped break q
Due to the positional deviation between the breakable line p and the breakable line p, it becomes difficult to smoothly start the break when the corrugated paperboard d is assembled into a packaging box shape.

In order to avoid this, an H-shaped cut q is formed on the basis of the breakable line p, and the breakable line p and the H-shaped cut q are formed on the second liner a. There is an inconvenience that the display is shifted from the printed one.

Therefore, as shown in FIG. 6 (c), by forming a narrow interval r between the parallel breakable lines p,
It is conceivable to prevent the breakable line p from deviating from the H-shaped break q even if the position where the breakable line p is formed is slightly deviated from the predetermined position.

However, if the space r between the breakable lines p parallel to each other is made narrow, fingers or the like cannot be inserted into the space r, and smooth breakage may be difficult.

Therefore, the line p that can be broken even if it is difficult to insert the finger p
In order to facilitate the breaking work of the breakable line p, the pitch between the breaks forming the breakable line p may be narrowed. According to this, the breakable line p to the first liner c is formed.
There is a possibility that the first liner c may be inadvertently cut in the formation step of. Therefore, it is necessary to form the pitch between the breaks forming the breakable line p relatively wide, which causes a problem that breakage along the breakable line p becomes difficult.

When the breakable line p is formed on the first liner c, the tip of the cutting blade of the cutting blade member cut into the first liner c abuts the pressing roll. As a result, the cutting edge is easily worn, and when the breakable line p is formed by the worn cutting edge, not only the quality of the corrugated paperboard deteriorates, but also the work efficiency decreases due to the replacement work of the cutting edge member.

Further, as an example different from the case where the breakable line is formed on the liner on one side in the pre-process of forming the corrugated paperboard as described above, the one side of the corrugated paperboard is broken in the post-process of forming the corrugated paperboard. It is also conceivable to form a possible line.

For example, while the corrugated paperboard is moved in the horizontal direction, a rupturable line is formed on the liner on the other side based on the printing on the liner on the other side by the same cutting blade member as that described above. Thereby, the breakable line can be formed on the liner on the other side without misalignment with the printing on the liner on the one side.

However, if a rupturable line is formed on one side of the corrugated paperboard by a cutting blade member having the same construction as described above,
It is difficult to adjust the cutting amount of the cutting blade of the cutting blade member to the liner, and further it is difficult to maintain the cutting amount of the cutting blade to the liner constant. As a result, there is a risk that the cutting edge will be over-cut, and the breakable line may reach the printed liner, which not only spoils the appearance but also reduces the strength when the packaging box is formed. There is.

[0016]

SUMMARY OF THE INVENTION The present invention eliminates such inconveniences and makes it possible to surely form a breakable line at a predetermined position by minimizing the crushing of corrugated paperboard.
It is another object of the present invention to provide a breakable line forming device for corrugated paperboard that can form a breakable line that is easy to break.

[0017]

In order to achieve such an object, the present invention provides a liner on one side of corrugated paperboard,
A device for forming a pair of breakable lines in which discontinuous cuts extend linearly in parallel, wherein a plurality of cutting blades are formed along the outer circumference, and the discs are provided at predetermined intervals in the axial direction. -Shaped pair of cutting blade members, a pair of abutting rolls provided on the outer side surfaces of both the cutting blade members, which regulate the cutting amount of the cutting blades and abut on the liner on one side of the corrugated paperboard, and the both cutting blades A cutting blade roll rotatably supported by an intermediate roll having a diameter smaller than that of the contact roll is interposed between the members, and the cutting roll is provided with an interval smaller than the thickness of the corrugated board. It is characterized in that it is provided with a pressing roll which is rotatably supported and which is opposed to the blade roll and comes into contact with the liner on the other side of the corrugated paperboard.

Further, it is preferable that the cutting blade roll and the pressing roll are offset from each other in the passage direction of the corrugated paperboard and face each other.

[0019]

In the apparatus of the present invention, a breakable line is formed on the liner on one side of the corrugated paperboard which is in contact with the cutting blade roll by passing the corrugated paperboard between the cutting blade roll and the pressing roll. .

When a breakable line is formed on the corrugated paperboard by the cutting blade roll, the cutting blade of the cutting blade member provided in the cutting blade roll cuts into the liner on one side to form a discontinuous cut. At this time, at the same time when the cutting blade cuts into the liner, the contact roll comes into contact with the liner in the vicinity of the cutting blade to regulate the cutting amount of the cutting blade. This prevents the cutting edge from overcutting and the breakable line reaching the liner on the other side.

At this time, even if the corrugated paperboard that has passed between the contact roll and the pressing roll is pressed by both rolls and crushed outside the breakable line, the diameter of the corrugated paperboard is smaller than that of the contact roll. By providing the intermediate roll between the cutting blade members, the corrugated board is not pressed between the cutting blade members, and the plate thickness between the breakable lines is maintained relatively large. Thus, when the breakable line is broken, the thick plate portion between the breakable lines reliably guides the breaking direction, and breaks along the breakable line are possible.

Further, the cutting blade roll and the pressing roll are opposed to each other with their positions offset from each other in the passage direction of the corrugated paperboard, so that, for example, the pressing roll and the cutting blade are placed above and below a horizontally moving corrugated paperboard. When the roll comes into contact with the roll, the pressing roll presses vertically downward and the cutting blade roll presses vertically upward. As a result, even if the corrugated paperboard is pressed by the cutting blade roll and the pressing roll, the pressing force escapes in the vertical direction,
Collapse of corrugated board is prevented.

Further, since the cutting blade roll and the pressing roll are opposed to each other with their positions displaced, even if the corrugated paperboard has a distortion, for example, the position just above the cutting blade roll and the position just below the pressing roll can be achieved. Corrugated paperboard is prevented from being cut too far by both rolls without being regulated by both rolls, and the cutting blades of the cutting rolls are subjected to the pressing force of the pressing roller from an oblique direction while being oblique to the corrugated board. Since it is cut into, the breakable line is smoothly formed.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view schematically showing an embodying device including the device of the present invention, FIG. 2 is an explanatory perspective view showing a rupturable line forming device which is the device of the present invention, and FIG. 3 main parts of the rupturable line forming device. FIG. 4 is an explanatory cross-sectional view showing in an enlarged manner, FIG. 4 is an explanatory view showing the operation of the breakable line forming device, and FIG. 5 is a partial explanatory view of the corrugated paperboard showing the breakable lines formed in this embodiment.

The embodying apparatus 1 of the present invention comprises a front side liner a,
After pasting the core b and the back side liner c, a plurality of rectangular corrugated paperboards d cut into predetermined dimensions are put into the corrugated paperboard d, and printing and finishing punching are sequentially performed to assemble a packaging box. It is processed into a possible state.

In FIG. 1, 2 is a printing unit for printing on the front liner a of the corrugated paperboard d, and 3 is the printing unit 2.
A breakable line forming device for forming a breakable line on the corrugated paperboard d delivered from the device, 4 a drying unit for drying the printing, and 5 a punching unit 5 for processing the corrugated paperboard d such as trimming and folding lines. is there.

The printing unit 2 inserts the corrugated paperboards d one by one from the insertion unit 6 provided on the upstream side thereof. At this time, the corrugated paperboard d is put in a direction orthogonal to the step of the core b. Although not shown, the corrugated paperboard d is loaded into the printing unit 2 by a conveyor having a suction for adsorbing the lower surface of the corrugated paperboard d.

The drying unit 4 inputs the corrugated paperboard d discharged from the printing unit 2 from the charging unit 7 and dries the printing surface of the corrugated paperboard d. The feeding section 7 is provided with a belt conveyor 8 having a suction, and a feed roll 9 which comes into contact with the corrugated paperboard d from the upper direction of the belt conveyor 8 and sends out the corrugated paperboard d in the charging direction.
As a result, the corrugated paperboard d is placed in the drying unit 4 in a horizontal state.

A breakable line forming device 3 is provided between the printing unit 2 and the drying unit 4. As shown in FIG. 1, the breakable line forming device 3 is composed of a cutting blade roll 10 and a pressing roll 11. The breakable wire forming device 3 is, as shown in FIG.
By supporting the cutting blade roll 10 on the rotary shaft 12 of the belt conveyor 8 provided in the feeding unit 7 of the drying unit 4 and the pressing roll 11 on the rotary shaft 13 of the feed roll 9, the feeding speed of the corrugated paperboard d is increased. The cutting blade roll 10 and the pressing roll 11 are rotated in synchronism with the above.
Further, as shown in FIG. 4, both rotary shafts 12 and 13 are axially parallel to each other, and are offset in the front-back direction with respect to the feeding direction of the corrugated paperboard d. These rotating shafts 12,
The positions of the cutting blade roll 10 and the pressing roll 11 are also shifted by 13. At this time, the displacement e of the respective axial centers of the cutting blade roll 10 and the pressing roll 11 is 40 in this embodiment.
mm. Further, as shown in FIG. 3, when the cutting blade roll 10 and the pressing roll 11 are viewed from the front, the facing interval in the vertical direction corresponds to the plate thickness of the corrugated paperboard d, and the dimension t thereof is set to 3 mm.

As shown in FIG. 3, the cutting blade roll 10 includes a pair of abutting rolls 14 and 14 for abutting the outer peripheral surface thereof with the back side liner c of the corrugated paperboard d, and abutting rolls 14 and 14.
Intermediate roll 15 provided between the rolls 14 and 1
A pair of disc-shaped cutting blade members 17 and 17 interposed between the rolls 15 and 16 and having the cutting blades 16 and 16 protruding from the outer peripheral surfaces of the rolls 14, 15 and 16 are provided. In this embodiment, as shown in FIG. 4, the contact rolls 14 and 14 have a diameter f of 200 mm and the intermediate roll 15 has a diameter g of 198 mm. Blade 1
The dimension h of 6 and 16 was 2 mm, and the distance i between the two cutting edges 16 and 16 was 18 mm. Further, the diameter j of the pressing roll 11
Was set to 204 mm.

Further, in the punching unit 5, a substantially H-shaped cut q is formed at the break start portion of the fold line k and the breakable line p as shown in FIG. 5 on the corrugated paperboard d after the drying by the drying unit 4. At the same time, trimming is performed to form the corrugated paperboard d that can be assembled.

Next, the operation of the breakable line forming device 3 having the above-described structure will be described. First, when the corrugated paperboard board d discharged from the printing unit 2 is put into the drying unit 4, it is shown in FIG. As shown, the corrugated cardboard board d passes between the cutting blade roll 10 and the pressing roll 11. As described above, the corrugated paperboard d is moved in the loading direction of the drying unit 4 while maintaining the horizontal state by the belt conveyor 8 and the feed roll 9 provided in the loading unit 7 of the drying unit 4.

At this time, the cutting blade roll 10 and the pressing roll 11 are opposed to each other with their positions displaced from each other with respect to the passage direction of the corrugated paperboard d, so that the corrugated paperboard d is separated from the cutting blade roll 10 and the pressing roll 11. It is possible to prevent crushing due to pressing. That is, since the pressing direction of the pressing roll 11 is vertically downward and the pressing direction of the cutting blade roll 10 is vertically upward, the positions of the highest pressing directions of the cutting blade roll 10 and the pressing roll 11 are displaced from each other. . Since the corrugated paperboard d is passed between the cutting blade roll 10 and the pressing roll 11 provided in such a state, the pressing force of the cutting blade roll 10 and the pressing roll 11 is an angle with respect to the corrugated corrugated paperboard d passing therethrough. Occurs with.
Therefore, even if the corrugated paperboard board d is pressed by the cutting blade roll 10 and the pressing roll 11, an excessive pressing force escapes in the vertical direction, so that the corrugated paperboard board d can be reliably prevented from being crushed. Furthermore, since the corrugated paperboard d receives the pressing force of the cutting blade roll 10 obliquely upward toward the roll, the cutting direction of the cutting blade 16 of the cutting blade roll 10 into the back side liner c of the corrugated paperboard d is diagonally upward. Becomes Thereby, the cutting blade 16 starts cutting into the back side liner c when the corrugated paperboard board d is located directly above the cutting blade roll 10, and immediately before the cutting blade 16 comes out of the cutout formed in the corrugated paperboard board d. Receives the pressing force from the pressing roll 11 and increases the cut amount, so that the breakable line can be reliably formed without the cut amount becoming excessively large.

Further, the cutting blade member 1 provided in the cutting blade roll 10
When the cutting edge 16 of No. 7 cuts into the back side liner c, the contact roll 14 contacts the back side liner c in the vicinity of the cutting edge 16 and regulates the piercing condition of the cutting edge 16.
The line that can be broken due to excessive sticking of the front side liner a
It is possible to form a breakable line without extending over.

Moreover, at this time, even if the contact rolls 14 and 14 come into contact with the corrugated paperboard board d to cause the corrugated paperboard board d to be insignificant or crushed, as shown in FIG. Has a smaller diameter than the contact rolls 14, 14, it is possible to maintain the plate thickness between the breakable lines relatively thick without pressing the corrugated board d between the cutting blade members 17, 17. As a result, the strength of the corrugated paperboard board d between the breakable lines is prevented, so that when the breakable line is broken, the corrugated boardboard d between the breakable lines does not break and can be reliably broken. Breaks along the line are possible.

Then, as described above, each liner a,
On a corrugated paperboard d formed by bonding c and the core b,
Since the rupturable lines are formed by the rupturable line forming device 3, compared with the conventional case where the rupturable lines are formed on the back liner c in the previous step of bonding the liners a, c and the core b. Thus, as shown in FIG. 5, the breakable line p can be reliably formed at a predetermined position of the corrugated paperboard d. Moreover, by doing so, the interval r between the pair of breakable lines p can be made relatively wide, and insertion of fingers and the like becomes easy. Further, even if the pitch s between the cuts forming the breakable line p is relatively narrow, the back side liner c is already attached to the other liners a and b, so that it is not cut and the breaking work is A breakable line p that can be smoothly performed can be formed.

[0037]

As is clear from the above, the device of the present invention forms a breakable line on the corrugated paperboard,
Unlike the conventional case where the breakable line is formed on the liner in the previous step of bonding each liner and the core, the breakable line can be reliably formed at a predetermined position.

Since the contact roll of the cutting blade roll and the pressing roll face each other with a gap corresponding to the thickness of the corrugated paperboard, the cutting blade of the cutting blade roll contacts the pressing roll. Without cutting edge wear,
The durability of the cutting edge can be improved.

When the breakable line is formed on the corrugated paperboard by the cutting blade roll, the contact roll contacts the liner on one side in the vicinity of the cutting blade to regulate the cutting amount of the cutting blade. It is possible to reliably prevent the breakable line from reaching the liner on the other side due to the blade cutting too much.

Further, at this time, since a roll having a diameter smaller than that of the abutting roll is provided between the cutting blade members, when a pair of breakable lines are formed, almost a pressure is applied between the breakable lines. Since it is possible to maintain a relatively large plate thickness between both breakable lines, it is possible to reliably perform a breaking operation along both breakable lines when breaking both breakable lines. it can.

Since the cutting blade roll and the pressing roll are displaced from each other with respect to the passing direction of the corrugated paperboard, the cutting blade roll and the pressing roll have an angle in the direction of pressing the corrugated paperboard. It is possible to form a breakable line without crushing the corrugated paperboard even when pressed by the cutting blade roll and the pressing roll. Furthermore, since the pressing force of the cutting blade roll is directed obliquely upward toward the pressing roll, the cutting edge of the cutting blade roll into the liner on one side of the corrugated paperboard is obliquely upward, which allows smooth breakage. Lines can be formed.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing an implementation device including the device of the present invention.

FIG. 2 is an explanatory perspective view showing a breakable wire forming device.

FIG. 3 is an explanatory cross-sectional view showing an enlarged main part of the breakable wire forming device.

FIG. 4 is an explanatory view showing the operation of the breakable wire forming device.

FIG. 5 is a partial explanatory view of corrugated paperboard showing breakable lines formed in this example.

FIG. 6 is a partial explanatory view of corrugated paperboard showing a conventional breakable line.

[Explanation of symbols]

3 ... Breakable line forming device, 10 ... Cutting blade roll, 11 ... Pressing roll, 14 ... First contact roll, 15 ... Intermediate roll, 16 ... Cutting blade, 17 ... Cutting blade member, a ... Front side liner (other side) Liner), c ... back side liner (one side liner), d ... corrugated paperboard, k ... fold line, p ... breakable line, q ... break start part.

Claims (2)

[Claims] 1. A device for forming a pair of breakable lines in which discontinuous cuts extend linearly in parallel on a liner on one side of corrugated paperboard, wherein a plurality of cutting edges are formed along an outer periphery. , A pair of disc-shaped cutting blade members provided at a predetermined interval in the axial direction, and provided on the outer surface side of both cutting blade members to regulate the cutting amount of the cutting blades and A pair of contact rolls that contact the liner, and a cutting blade roll that is interposed between both cutting blade members and that is rotatably supported by an intermediate roll having a diameter smaller than the contact rolls. In a corrugated paperboard characterized by comprising a rotatably supported pressing roll which is opposed to the cutting blade roll at a distance smaller than the plate thickness dimension and is in contact with the liner on the other side of the corrugated paperboard. Breakable line forming device. 2. The breakable line forming device for corrugated board according to claim 1, wherein the cutting blade roll and the pressing roll are opposed to each other with their positions displaced from each other in the passage direction of the corrugated board.