JPH1110754A - Corrugated fiberboard sheet having ruled line and device for forming ruled line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide corrugated cardboard sheets capable of being folded highly accurately along vertically ruled lines. SOLUTION: Vertical ruled lines 10 are made by crushing operation from the surfaces being insides during the period of folding corrugated cardboard sheet 1. The vertical ruled lines 10 are formed into corrugation, and by the vertical ruled lines 10, and an average strength of the corrugated cardboard sheet 1 at ruled position is rendered lower than the other portions, thereby permitting the corrugated cardboard sheet 1 to be folded along the vertical ruled lines 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated cardboard sheet and a creaser.

[0002]

In general, the cardboard box is formed by folding from the blank A ₁ shown in FIG. 9 (II). Blank A _1, as shown in FIG. 9 (I), is formed by punching from the rectangular corrugated cardboard A ₀ having a horizontal ruled line 50 parallel Article 2. Simultaneously with the punching, a plurality of vertical ruled lines 5
1, 52, 53 and 54 are provided, and each vertical ruled line 51, 5
2,53,54 is stage direction of the core 2 in the wave forming the corrugated cardboard A _0, i.e., extends in the longitudinal direction of the mountain 2a.

[0003] The blank A ₁ is, usually, is supplied to the folder gluer, vertical ruled by the folder gluer 51,5
3 is bent. Further, the joint flaps 4 provided on the blank A ₁ is bonded to the ends of the blank A ₁ via the applied adhesive. By the bonding, FIG.
A flat cardboard box B as shown in (III) is formed,
The cardboard box B is three-dimensionally assembled by bending from the horizontal ruled line 50.

[0004] To produce the high dimensional accuracy corrugated cardboard box B, the vertical ruled lines provided on the blank A ₁ 51,52,5
It is necessary to bend accurately along 3, 54.

Here, the vertical ruled lines 51, 52, 53, 54
As shown in FIG. 10, provided at two equally spaced positions between adjacent peaks 2 a in the center 2 of the blank A ₁ ,
Since the left and right shapes sandwiching the vertical ruled line are symmetrical, the strength of the left and right portions is substantially equal, and the vertical ruled lines 51, 52, 53,
It is possible to bend relatively accurately along 54.

The vertical ruled lines 51, 52, 53, 54
Is extremely rarely provided at a bisecting position of a ridge 2a adjacent to the center core 2, and is often provided at a position deviated left and right from the bisecting position. In this case, since the shapes at the left and right portions where the vertical ruled lines 51, 52, 53, 54 are symmetrical are asymmetric, the strengths at the left and right portions are different. For this reason, when the corrugated paper is bent along the vertical ruled lines 51 and 53, the bending position is offset in the weaker strength and cannot be bent accurately.
As shown in (I), or a cardboard box B ₁ in which the width dimension of the upper and lower is different are formed, or, as shown in FIG. 11 (II), a cardboard box B ₂ with just enough adhesion margins of the joint flap 4 Is formed, and a cardboard box with high dimensional accuracy cannot be formed.

[0007] As ruling insertion device to insert a vertical ruled lines in corrugated paper A _0, the belt-shaped member is provided along both sides of the border edge, the ruling insertion time by pushing the border edge, both side portions of the ruling insertion portion by the belt-shaped member What has been crushed is conventionally known.

However, in the above scoring device, since corrugated paper is pushed over the entire flat surface of the band-shaped member, both side portions of the scoring position by the scribing blade cannot be completely crushed. The strength of both sides of the crease portion is different, and a cardboard box with high dimensional accuracy cannot be formed.

In order to solve the above-mentioned problems, in the invention described in Japanese Patent Application Laid-Open No. 9-70905, a ruled line formed on corrugated cardboard is formed by a main line portion and an adjacent line provided along the main line portion. The main line portion and the adjacent portion are formed by crushing from the inner surface at the time of bending.

[0010] In the corrugated paperboard, the adjacent portion intermittently crushes the core core to reduce the strength of the core.
In folding of corrugated paper, it is characterized in that corrugated paper can be bent with high accuracy along the main line.

[0011]

By the way, in the ruled line composed of the main line portion and the adjacent portion, since the adjacent portion is orthogonal to the main line portion, when a load acts from above in the assembled state of the cardboard box, Stress concentrates on the adjacent part,
The adjacent portion is easily deformed, and a corrugated cardboard box having a high compressive strength cannot be formed.

An object of the present invention is to provide a creased corrugated cardboard sheet and a creaser capable of forming a corrugated cardboard box having a high compressive strength while being able to bend with high accuracy along a crease line.

[0013]

In order to solve the above-mentioned problems, a corrugated cardboard sheet according to the present invention is formed in such a manner that the corrugated cardboard sheet is formed in parallel with the corrugated middle step by crushing from an inner surface at the time of bending. In a corrugated cardboard sheet having a ruled line, a configuration in which the ruled line is corrugated is employed. The term “parallel to the step” refers to a direction in which the peaks and valleys of the wavy middle core extend long.

Here, the wavy ruled line is a linear first inclined line inclined leftward with respect to the ridgeline of the center mountain, and a linear second inclined line inclined in the opposite direction to the first inclined line. The inclined line may be a continuous line alternately arranged, a straight line along the ridgeline of the mountain of the core, a first bent line of a V-shape continuous with the straight line,
A straight line along the ridge line continuing from the first bending line and a second U-shaped bending line continuing from the straight line and opposite to the first bending line are arranged in this order. You may.

[0015] Further, a continuous line in which a first arcuate line curving leftward and a second arcuate line curving rightward with respect to the ridgeline of the center mountain may be alternately arranged.

Further, a straight line along the ridge line of the center core mountain, a first arc line curved to the left with respect to the straight line, a straight line along the ridge line, and a first curved line curved to the right with respect to the straight line. A continuous line in which the two arc-shaped lines are arranged in this order may be used.

Further, the continuous line may be formed symmetrically with respect to a bisecting position of the width dimension thereof as a symmetrical line.
The entire inner portion surrounded by two continuous lines may be crushed flat.

The width of the wavy ruled line is arbitrary, and is preferably equal to or less than the pitch of the core peak in forming a cardboard box having high dimensional accuracy.

In the scoring device according to the present invention, the corrugated cardboard sheet supplied between the two members is attached to the die board by relatively moving the flat anvil and the die boat opposed to the anvil. In a creaser which is crushed by a ruled line blade to apply a ruled line parallel to the corrugated center line, a configuration in which the ruled line blade is corrugated is employed.

Further, in the creaser according to the present invention, a crease head is attached to each of the upper crease roll and the lower crease roll, and a corrugated cardboard sheet fed between the crease heads is moved by a crease blade provided on one of the crease heads. In a creaser which crushes and applies a ruled line parallel to the corrugated middle step, a configuration in which the ruled line blade is corrugated is employed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 (I) and (II), the corrugated cardboard sheet 1 comprises a corrugated core 2 and a liner 3 bonded to both sides thereof.
A folding ruled line (hereinafter, referred to as a vertical ruled line) 10 is provided in parallel with the first row.

The vertical ruled line 10 is a ridge line 2b of a mountain 2a of the core 2.
And a straight second inclined line 12 inclined in the opposite direction with respect to the first inclined line 1 and a linear first inclined line 11 inclined in the left direction with respect to the line. I have. The width dimension W of the vertical ruled line 10 is arbitrary, and is preferably set to be equal to or less than the pitch P of the peak 2a of the center core 2.

For this reason, when the vertical ruled line 10 is formed to be shifted leftward or rightward from the center between the adjacent peaks 2a and provided at a position close to one peak 2a, the vertical ruled line 10
Reduces the strength of the ridge 2a by intermittently crushing one ridge 2a of the core 2 and reduces the average strength of the core 2 at the position where the vertical ruled line 10 is formed with respect to the other portions. Will be.

Now, when the corrugated cardboard sheet 2 is bent along the vertical ruled line 10, the strength at the position where the vertical ruled line 10 is formed is lower than that of the other parts, so that the bending stress is reduced by the vertical ruled line 1.
0, and the corrugated cardboard sheet 2 is
Can be bent as a bending line.

As the bending proceeds, both sides of the vertical ruled line 10 start to interfere with each other. Here, when the vertical ruled line 10 is formed at the center between the adjacent peaks 2a of the core 2, the strength of the adjacent peaks 2a is substantially the same.
, The adjacent ridges 2a are evenly crushed. For this reason, there is no deviation in the bending line, and the corrugated cardboard sheet 2 can be bent accurately.

On the other hand, the vertical ruled line 10 is one peak 2a of the center core 2.
If the vertical ruled line 10 is formed at a position facing
Crushes the crest 2a at the creased position intermittently to
0, the strength of the vertical ruled line 10 at the crease position is substantially averaged over the entire length, and the strength at both sides is the same. Both sides will be evenly crushed.

For this reason, the corrugated paperboard sheet 1 can be bent with high precision along the vertical ruled line 10 without causing any deviation in the folding line.

Further, since the vertical ruled line 10 is a wavy continuous line, a cardboard box resistant to compression can be formed.

FIGS. 2 (I) to (III), FIGS. 3 (I) to (IV), and FIGS. 4 (I) to (IV) show other examples of the vertical ruled line 10. FIG. In the vertical ruled line 10 shown in FIG. 2 (I), a straight line 13 along the ridge line 2b of the mountain 2a of the core 2 and a straight line 1
3, a straight line 15 along the ridge line 2 b continuous with the first bent line 14, a continuous line 15 along the ridge line 2 b, and a continuous line 15 with the first bent line 14. An inverted U-shaped second bent line 16 is a continuous wavy line continuously arranged in that order.

In the vertical ruled line 10 shown in FIG.
The first arcuate line 17 curving leftward and the second arcuate line 18 curving rightward with respect to the ridgeline 2b of the mountain 2a of the center core 2 are formed as wavy continuous lines alternately arranged.

In the vertical ruled line 10 shown in FIG. 2 (III), a straight line 19 along the ridge line 2b of the mountain 2a of the center core 2, a first arcuate line 20 curved to the left with respect to the straight line 19,
A straight line 21 along the ridge line 2b and a second arcuate line 22 curved rightward with respect to the straight line 21 are a continuous wave-like line continuously arranged in this order.

In the vertical ruled lines 10 shown in FIGS. 3 (I) to (IV), the center of the width of each vertical ruled line 10 of FIGS. 1 (I) and 2 (I) to (III) is symmetrical with respect to the center of width. It is a formed wavy continuous line.

In the vertical ruled line 10 shown in FIGS. 4 (I) to 4 (IV), the entire inner part surrounded by two continuous lines of the vertical ruled line 10 shown in FIG. .

In any of the above vertical ruled lines 10, the width dimension is substantially equal to the pitch P of the peak 2a of the core 2 shown in FIG. 1 (II).

Any one of the corrugated cardboard sheets 1 shown in FIGS.
In the case of (1), the corrugated cardboard sheet 10 can be bent with high precision along the vertical ruled line 10 as in the case of the corrugated cardboard sheet 1 shown in FIG. 1, and the vertical ruled line 10 is a continuous line. A strong cardboard box can be formed.

Further, in the case of the vertical ruled line 10 shown in FIGS. 4 (I) to 4 (IV), the inner part surrounded by two continuous lines is crushed, so that the vertical ruled line 10 is more effective along the vertical ruled line 10. And can be easily bent.

In FIGS. 1 to 4, only the vertical ruled lines 10 are inserted into the corrugated cardboard sheet 1 having a uniform thickness throughout the entirety. However, when the vertical ruled lines 10 are deep, when the vertical ruled lines 10 are cut, Since there is a possibility that the corrugated cardboard sheet 1 may be creased, as shown in FIG.
Is crushed flat, and a vertical ruled line 10 is formed at the center of the crushed portion 23.

As described above, when the crushed portion 23 is provided, the strength of the crushed portion 23 is lower than that of the other portions, and the strength of the crushed portion 23 is lower when bending along the vertical ruled line 10.
Can collide with each other, so that it is possible to reliably prevent the bending line from being displaced, and the corrugated cardboard sheet 1 can be bent with extremely high precision.

FIG. 5 shows an embodiment of a scoring device according to the present invention. This scoring device is a flat anvil 3
0, and a die plate 31 disposed opposite to the anvil 30 so that the anvil 30 and the die plate 31 are relatively moved.

The die board 3 is provided on the lower surface of the die plate 31.
2 is attached, and the corrugated ruled blade 3 is attached to the die board 32.
3 are implanted. Further, crushing members 33 for crushing the corrugated cardboard sheet 1 are attached to the die board 32 on both sides of the ruled line blade 33. The crushing member 33 is formed of cork or the like and has elasticity.

Now, the cardboard sheet 1 is placed on the anvil 30.
When the anvil 30 and the die plate 31 are moved in a direction of relatively approaching in a state where
As shown in (1), the corrugated cardboard sheet 1 is crushed by the ruled line blade 33 and is scored in a streak shape.

At this time, since the ruled line blade 33 has a waveform,
A corrugated vertical ruled line 10 is formed on the corrugated cardboard sheet 1.
FIGS. 1 and 3 (I) to 3 (I) show waveforms of the ruled line blade 33.
V) and the shape of the vertical ruled line 10 shown in FIGS. 4 (I) to (IV), the vertical ruled line 1
Thus, a corrugated cardboard sheet 1 with 0 can be obtained.

Further, by providing a protrusion having the same shape as the vertical ruled line 10 shown in FIGS. 4 (I) to (IV) at the tip of the ruled line blade 33, the vertical ruled line shown in FIGS. 4 (I) to (IV) is provided. The cardboard sheet 1 with 10 can be obtained.

FIGS. 7A and 7B show another embodiment of the scoring device. In this embodiment, an upper ruled line roll 40 and a lower ruled line roll 41 are provided in the transfer path of the corrugated cardboard sheet 1, and the ruled line heads 42, 43 are provided on both rolls 40, 41.
Is mounted so that the position can be adjusted in the roll axis direction.

The ruled line head 42 of the upper ruled line roll 40
Is provided with a ruled-line blade 44, and the ruled-line blade 44 has a wavy shape. On the other hand, a cylindrical outer surface 45 is provided on the ruled line head 43 of the lower ruled line roll 41.

In the scoring device having the above configuration,
The upper crease roll 40 and the lower crease roll 41 and the corrugated cardboard sheet 1 are supplied between the two rolls 40 and 41 while being rotated in the direction of the arrow in FIG. It is crushed by the blade 44 and scored in a streak shape.

At this time, since the ruled line blade 44 has a waveform,
Corrugated cardboard sheet 1 is provided with wavy vertical ruled lines. The shape of the ruled line blade 44 is shown in FIGS. 1 (I) and 2 (I) to (III).
By forming the same shape as the vertical ruled line 10 shown in FIGS. 3 (I) to (IV), the corrugated cardboard sheet 1 with the vertical ruled shown in each of the above figures can be easily formed.

4 (I) through 4 (IV) are shown in FIG.
By forming a protrusion having the same shape as the vertical ruled line 10 shown in FIG. 4, the corrugated cardboard sheet 1 with the vertical ruled shown in FIG. 4 can be easily formed.

In the creaser shown in FIG. 7 (I), an upper crease roll 46 and a lower crease roll 47 indicated by chain lines in the same figure are provided upstream or downstream of the upper crease roll 40 and the lower crease roll 41. The rolls 46 and 47 may be provided so as to flatten the position where the vertical rule of the corrugated cardboard sheet 1 is formed over a required width dimension.

In this case, as shown in FIG. 8, the flat crushed portion 23 of the corrugated cardboard sheet 1 causes
Are crushed several times, and the strength is weakened over the entirety.

[0052]

As described above, in the present invention, the vertical ruled lines are corrugated, so that the average strength of the vertical ruled lines at the scribed position is weaker than other portions, and when the corrugated cardboard sheet is bent, It can be bent very accurately along the vertical ruled line.

Further, since the vertical rule is a wavy continuous line, the strength of the vertical ruled portion in the vertical rule direction is hardly reduced, and a cardboard box with high compressive strength can be formed.

Further, the corrugated cardboard sheet is attached to the die board and the corrugated cardboard sheet is pressed between the die board and the anvil, so that a corrugated corrugated cardboard sheet with vertical ruled lines can be easily manufactured.

Also, a corrugated ruled blade is provided on one of the ruled line heads facing up and down, and the corrugated cardboard sheet is passed between the ruled line heads rotating in opposite directions to crush the corrugated cardboard sheet from the ruled line blade. A corrugated cardboard sheet with wavy vertical lines can be easily formed.

[Brief description of the drawings]

FIG. 1 (I) is a front view showing a part of a corrugated cardboard sheet according to the present invention, and FIG. 1 (II) is a sectional view taken along the line II in FIG. 1 (I).

FIGS. 2 (I) to (III) are front views showing other examples of the vertical rule of the above.

FIGS. 3 (I) to (IV) are front views showing still another example of the vertical rule of the above.

FIGS. 4 (I) to (IV) are front views showing other examples of the above vertical rule.

FIG. 5 (I) is a front view of a scoring device according to the present invention,
(II) is a perspective view showing a ruled line blade

FIG. 6 is a sectional view showing a ruled state of the above.

FIG. 7 (I) is a front view of a scoring device according to the present invention,
(II) is a side view of the above.

FIG. 8 is a sectional view showing another embodiment of a corrugated cardboard sheet.

FIGS. 9 (I), (II) and (III) are front views showing steps of forming a cardboard box in a stepwise manner.

FIG. 10 is a sectional view of a blank.

11 (I) and (II) are front views showing a defective cardboard box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugated cardboard sheet 2 Middle core 2a Crest 2b Ridge line 10 Vertical ruled line 11 First inclined line 12 Second inclined line 13 Straight line 14 First bent line 15 Straight line 16 Second bent line 17 First arc line 18 Second arc line 19 Straight line 20 1st arc line 21 straight line 22 2nd arc line 30 anvil 32 die board 33 ruled line blade 40 upper ruled line roll 41 lower ruled line roll 42 ruled line head 43 ruled line head 44 ruled line blade

Claims (9)

[Claims] 1. A creased corrugated cardboard sheet having a ruled line formed in parallel with a step of a corrugated center by crushing from an inner surface at the time of folding, wherein the ruled line is formed into a wave shape. Corrugated cardboard sheet. 2. A linear first inclined line in which the wavy ruled line inclines to the left with respect to a ridgeline of a central mountain, and a linear second inclined line inclining in a direction opposite to the first inclined line. 2. The creased corrugated cardboard sheet according to claim 1, wherein the corrugated cardboard sheet comprises a continuous line alternately arranged. 3. The wavy ruled line is a straight line along a ridge line of a mountain of a center, and a first bent line in a U shape that is continuous with the straight line.
A straight line extending along the ridge line continuously from the first bent line and a C-shaped second bent line continuous with the straight line and opposite to the first bent line are arranged in accordance with the order. The ruled corrugated cardboard sheet according to claim 1, wherein 4. The method according to claim 1, wherein the wavy ruled line comprises a continuous line in which a first arcuate line curving leftward and a second arcuate line curving rightward are alternately arranged with respect to the ridgeline of the mountain at the center. The ruled corrugated cardboard sheet according to claim 1, characterized in that: 5. A straight line along which the wavy ruled line extends along the ridge line of the mountain at the center, a first arc line curved to the left with respect to the straight line, a straight line along the ridge line, and a right line with respect to the straight line. The ruled corrugated cardboard sheet according to claim 1, wherein the curved second arc-shaped line comprises a continuous line arranged in the order. 6. The corrugated cardboard sheet according to claim 2, wherein the continuous line is formed bilaterally symmetrically at a bisecting position of the width dimension thereof as a symmetrical line. 7. The corrugated cardboard sheet according to claim 6, wherein the entire inner portion surrounded by the two continuous lines is squashed flat. 8. A corrugated sheet fed between both members is crushed by a ruled line blade attached to a die board, and the corrugated sheet is corrugated by relatively moving a flat anvil and a die boat opposed to the anvil. A scoring device for applying a crease parallel to a center line, wherein the crease blade is wavy. 9. A ruled line head is attached to each of an upper ruled line roll and a lower ruled line roll, and a corrugated cardboard sheet fed between the ruled line heads is crushed by a ruled line blade provided on one ruled line head to form a ruled line. A scoring device, wherein the crease blades are corrugated.