JPH08169634A - Remedy method for warp of corrugated cardboard and device thereof - Google Patents

Abstract

PURPOSE: To provide a method, making any warp of a corrugated cardboard remediable by way of stacking it zigzag in piles easily and simply, and the device. CONSTITUTION: This device is equipped with a step, conveying a sheet of corrugated cardboard 25 stuck with each liner on both the sides continuously by a corrugater, and another step installing two notches 27 and 29 each on both the sides of this strip-formed corrugated cardboard 25 alternately at the specified interval by both obverse and reverse liner notching means, respectively. In addition, it is equipped with a more step, folding those of notches 27 and 29 installed in the cross direction of the corrugated cardboard 25 alternately and stacking the cardboard 25 zigzag on a stacker 31, straightening the warp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for correcting warpage of corrugated cardboard manufactured by a corrugator, and is particularly suitable for use in manufacturing corrugated cardboard boxes.

[0002]

2. Description of the Related Art When manufacturing a corrugated cardboard box, the core paper and the liner are taken out from each other and stuck to each other, and the continuous strip-shaped corrugated board thus obtained is cut into corrugated board sheets of a predetermined length. Then, the cardboard sheet is subjected to necessary printing at predetermined locations, and the corrugated cardboard box is processed according to the developed shape of the cardboard box to be manufactured, and the corrugated board is subjected to scoring, grooving, and joint margin necessary for forming the cardboard box. After that, the assembly work is performed to manufacture a cardboard box.

Usually, a corrugator is used to obtain a corrugated cardboard sheet from a winding base paper, and a printing box making machine is used to print a corrugated cardboard sheet and then assemble a corrugated cardboard box. The corrugated cardboard sheets are stacked on a stacker. It is designed to be loaded into the printing box making machine from the corrugator in the closed state.

[0004]

Corrugated board manufactured by the corrugator has a slight difference in water content on both the front and back sides thereof, and thus warps gradually while being stacked on the stacker as a corrugated board sheet. It may adversely affect the subsequent printing operations, scoring, grooving and seaming margins.

In order to avoid such a problem, it is effective to carry out so-called reverse stacking, in which the upper and lower sides of the corrugated board sheets are alternately turned upside down.

However, in order to stack the cut corrugated cardboard sheets back on the stacker, it is necessary to incorporate into the corrugator a relatively large device for flipping the corrugated cardboard sheets up and down by 180 degrees. Since the manufacturing cost and the floor space of the installation are considerably increased, it has not yet been put to practical use.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and a device for straightening and reversing a corrugated cardboard board easily and easily without using a reversing device as described above.

[0008]

According to a first aspect of the present invention, a step of continuously transporting a belt-shaped corrugated cardboard with liners attached to the front and back surfaces thereof and alternating to the front and back surfaces of the belt-shaped corrugated cardboard. The warp of the corrugated board, which comprises a step of engraving notches at predetermined intervals and a step of alternately folding the notched portions engraved in the width direction of the corrugated board and stacking the corrugated board in zigzag. There is a correction method.

A second mode of the present invention corresponding to the first mode is a corrugator for delivering a corrugated cardboard having liners on both front and back surfaces, and a corrugator for delivering a corrugated cardboard on the front liner side. A front liner notch means provided on the front liner side of the corrugated board for engraving notches at predetermined intervals in the width direction thereof,
It is provided on the back liner side of the corrugated cardboard sent out from the corrugator, and is shifted in the width direction on the back liner side of the corrugated board in a state of being shifted by a half pitch with respect to the interval of the cuts carved by the front liner cutting means. A back liner notch means for engraving notches at predetermined intervals,
A warp correction device for a corrugated board, comprising: a stacker for accommodating the corrugated board formed by stacking the corrugated boards in a zigzag manner by alternately folding the cut parts formed by the front liner cutting means and the back liner cutting means.

Here, it is also effective to further include a step of paying out the corrugated cardboard folded in zigzag and printing on the surface of the corrugated cardboard based on the cut portion.

Further, a third embodiment of the present invention is a step of continuously transporting a belt-shaped corrugated cardboard having liners on both front and back surfaces thereof, and cutting the belt-shaped corrugated cardboard alternately at predetermined intervals. The step of engraving, the step of stacking the corrugated board in a zigzag by alternately folding the notched parts engraved in the width direction of the corrugated board, and the interval of the notch and the notch based on the stacked state of the corrugated board. And a step of correcting at least one of the directions.

On the other hand, according to a fourth aspect of the present invention, a step of continuously transporting a belt-shaped corrugated board having liners on both front and back surfaces and a step of forming perforations on the belt-shaped corrugated board at predetermined intervals And a step of stacking the corrugated board in a zigzag manner by alternately folding perforated portions engraved in the width direction of the corrugated board, and correcting the warp of the corrugated board.

According to a fifth aspect of the present invention corresponding to the fourth aspect, a corrugator for delivering a corrugated cardboard having liners on both front and back surfaces and a corrugator for corrugated cardboard delivered from the corrugator are opposed to each other. Perforation cutting means for forming perforations on the corrugated board at predetermined intervals in the width direction, corrugated cardboard bending means for alternately bending the perforations formed by the perforation cutting means, and this corrugated cardboard folding means According to another aspect of the present invention, there is provided a cardboard warp correction device, comprising: a stacker for accommodating the corrugated cardboards alternately folded by zigzag.

Further, a sixth aspect of the present invention is a step of continuously transporting a belt-shaped corrugated cardboard having liners on both front and back surfaces and a step of forming perforations on the belt-shaped corrugated cardboard at predetermined intervals. And stacking the corrugated board in zigzag by alternately folding the perforated portions engraved in the width direction of the corrugated board, and perforation spacing and perforation direction based on the stacked state of the corrugated board. And a step of correcting at least one of the above.

[0015]

According to the first and second aspects of the present invention, the corrugator sends out the corrugated cardboard in the form of strips having liners on both sides. Further, by the front liner notch means and the back liner notch means, the notches are alternately engraved on the front and back surfaces of the corrugated board at predetermined intervals. Then, the cut portions are alternately folded and the cardboards are stacked in a zigzag manner and stored in the stacker. By thus stacking the sheets in a zigzag state on the stacker, the warp of the corrugated board is corrected.

According to the third or sixth aspect of the present invention, when the notches or perforations of the corrugated cardboard piled up in a zigzag pattern are deviated from the regular state, the notches or perforations arranged vertically are formed. The position of the part shifts back and forth along the cardboard loading direction. Based on this front-to-back misalignment, the notches or perforation intervals are corrected so that the positions of the notches or perforations lined up and down do not deviate back and forth along the cardboard carry-in direction. Further, if the cutouts or the perforations of the corrugated cardboards stacked in a zigzag pattern are deviated from the normal state, the corrugated cardboards vertically stacked are displaced along the width direction. Based on this deviation, the direction of the notch or perforation is corrected so that the vertically overlapping corrugated board does not move along its width direction.

On the other hand, according to the fourth and fifth aspects of the present invention, the corrugator sends out the corrugated strip-shaped corrugated cardboard having liners on both front and back surfaces thereof. Further, the perforation is formed on the cardboard at predetermined intervals by the perforation cutting means. Then, the perforations are alternately bent by the corrugated board folding means, and the corrugated boards are stored in the stacker in a zigzag stacked state. By thus stacking the sheets in a zigzag state on the stacker, the warp of the corrugated board is corrected.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to the manufacture of a corrugated board box made of double-faced corrugated board will be described in detail with reference to FIG. 1 showing a schematic structure thereof and FIG. 2 showing an appearance of a main part thereof.

That is, the corrugator in this embodiment comprises a winding base paper 12 which becomes the center shin 11, and a winding base paper 15 which becomes the front liner 13 and the back liner 14, respectively.
Mill roll stands 17, 18 and 19 that respectively support 16 and feed them, and the roll paper 12 and 1 of the consumed middle shin 11, front liner 13 or back liner 14 that have been consumed.
Auto splicer 20 that automatically splices the next roll paper to 5 and 16 and mill roll stand 17, 18 and 1
The pre-heater 21 for preheating the middle shin 11 and the front liner 13 or the back liner 14 fed from 9 and controlling the humidity to achieve step formation and solidification of the adhesive in a short time, and a corrugated step on the middle shin 11. Formed and glued to the front liner 13
, A single facer 23 for manufacturing the single-sided corrugated board 22, a glue machine 24 for transferring glue to the top of the single-sided corrugated board 22, and a back liner 14 bonded to the top of the single-sided corrugated board 22. A double facer 26 for manufacturing a double-faced corrugated board 25, a front liner notch means 28 for engraving a notch 27 on the front liner 13 side of the double-faced corrugated board 25 in the width direction thereof, and a back liner 14 for the double-faced corrugated board 25.
The back liner notch means 30 for engraving the notches 29 on the side in the width direction and the notches 27, 29 formed alternately on the front and back surfaces of the double-faced cardboard 25 are folded to stack the double-faced cardboard 25 in a zigzag manner. Stacker 3
1 and.

If necessary, a slitter scorer for cutting the double-faced corrugated board 25 into a predetermined width may be provided between the double facer 26 and the front liner cutting means 28. Further, other than the front liner cutting means 28 and the back liner cutting means 30, that is, the mill roll stands 17 to 19, the auto splicer 20, the preheater 21, the single facer 23, the glue machine 24, the double facer 26, and the stacker 31 are the conventional corrugator. The same structure as can be adopted.

As shown in FIG. 2 which shows the schematic structure of the front liner cutting means 28 and the back liner cutting means 30 described above, the front liner cutting means 28 in the present embodiment.
Includes a pair of cylindrical cutter drums 32 and anvils 33 that are opposed to each other with a strip-shaped double-sided corrugated board 25 interposed therebetween. On the outer peripheral surface of the cutter drum 32 located on the front liner 13 side of the double-sided corrugated board 25, a cutter knife 3 for engraving the front liner 13 side of the double-sided corrugated board 25 in the width direction thereof.
4 is projected in a spiral shape. In addition, double-sided corrugated board 25
On the outer peripheral surface of the anvil 33 located on the back liner 14 side, a knife receiver 35 having a groove shape corresponding to the cutter knife 34 and engaged with the cutter knife 34 is formed in a spiral shape.

The cutter drum 32 and the anvil 3
3 corresponds to the time when the cut 27 is cut at a predetermined position on the front liner 13 side of the double-faced corrugated board 22, and these approach each other to the cut position on the double-faced corrugated board 22 side, and at the same time, the peripheral speed equal to the conveying speed of the double-faced corrugated board 25. After accelerating to, the notch 27 is engraved at a predetermined position on the front liner 13 side of the double-faced corrugated board 22, and then they retreat to the standby position and stop rotating until the next notching work. The above operations are all completed during one rotation of the cutter drum 32 and the anvil 33, and the specific structure thereof is already known to rotary type shears and the like.

The protruding length of the cutter knife 34 is
The thickness of the double-sided corrugated board 25 is set to be about a little over half the thickness.

The back liner cutting means 30 has basically the same structure as the front liner cutting means 28 described above, and the vertical relationship between the cutter drum 32 and the anvil 33 is reversed. That is, the anvil 33 is arranged on the front liner 13 side of the double-faced cardboard 25, and the cutter drum 32 is arranged on the back liner 14 side of the double-faced cardboard 25. Further, the position of the notch 29 carved on the back liner 14 side by the back liner notch means 30 is located exactly in the middle of two adjacent notch 27 parts carved on the front liner 13 side by the front liner notch means 28. So that these front liner cutting means 28
The operation timing of the back liner cutting means 30 is controlled respectively.

In this embodiment, the front liner cutting means 28
Although the back liner cutting means 30 and the back liner cutting means 30 are separately provided, a cutter knife is attached to the anvil of the front liner cutting means 28 or to the anvil of the back liner cutting means 30 so that it can be used as a cutter drum. It is possible to omit either one of the back liner cutting means 30. In this case, only the cutter drum on the side involved in the cutting is driven and rotated, and the cutter drum on the side not involved in the cutting is used as the anvil in the non-rotating state, and as the anvil and the tip of the cutter knife on the side of the cutting drum that rotates during the cutting work. These may be brought close to each other so that a gap is formed between the outer peripheral surface of the functioning cutter drum.

Instead of such a rotary type cutter drum, it is also possible to adopt a structure in which the cutter moves in the width direction of the double-faced corrugated board 25 to form a cut. In this case, the moving direction of the cutter needs to be inclined with respect to the width direction of the double-faced corrugated board 25.

The pallet 36 for receiving the double-faced corrugated board 25 of the stacker 31 can be moved up and down so that the stacking surface of the double-faced corrugated board 30 located at the top is always in a fixed position. That is, as the double-sided corrugated board 25 is stacked in a zigzag manner, the pallet 36 is also lowered so that the notches 27 and 29 of the double-faced corrugated board 25 are smoothly folded.

After the operator manually bends the first cut portion of the front end portion of the double-faced cardboard 25 carried onto the pallet 36 of the stacker 31, the double-faced cardboard 25 is automatically zigzaged by its own weight. In this case, it is also effective to swing the stacker 31 back and forth (left and right in FIG. 1) along the conveyance direction of the double-faced corrugated board 25 in accordance with the pitch of the cuts 27 and 29.

It should be noted that the surface of the double-faced cardboard 25 opposite to the portion where the cuts 27 and 29 are formed is the inner side, and the cutouts 27 and 29 of the double-faced cardboard 25 are directly above the stacker 31 so that they can be smoothly folded. Double-sided corrugated board 25 on the side opposite to the part where the notches 27 and 29 are formed by protruding
A pair of air nozzles that may face the surface of the stacker 31 may be provided above the stacker 31. These air nozzles have
A compressed air supply source (not shown) is connected, and the cut 2 is made by the pressure of the compressed air blown from this air nozzle.
The surface of the double-faced corrugated board 25 on the side opposite to the portion where the 7, 29 are formed is the inner side, and the notch 27,
The 29 parts are smoothly folded and zigzag stacked on the stacker 31.

As a result, the front liner 13 side of the double-faced corrugated board 25 overlaps with each other and the back liner side 14 overlaps with each other, and the warp of the double-faced corrugated board 25 is automatically corrected by its own weight.

Here, if the intervals of the notches 27 and 29 are shifted and not equal, the double-sided corrugated board 25 stacked in the stacker 31 has its upper end side shifted forward and backward in the transport direction as the stacked state progresses. In other words, the distance between the cuts 27, 29 is set correctly according to the size of the displacement of the cuts 27, 29 of the double-faced corrugated board 25 along the vertical direction with respect to the vertical plane in the front-back direction (the left-right direction in FIG. 1). You can be sure that not. Therefore, the cutter knife 3 of the front liner cutting means 28 is adjusted according to the deviation of the arrangement position along the vertical direction of the cuts 27, 29 of the double-faced corrugated board 25 with respect to the vertical plane.
4 or the knife receiver 35 and the rotation phase of the cutter knife 34 and the knife receiver 35 of the back liner cutting means 30 are finely adjusted relatively, or these front liner cutting means 28 and back liner cutting means 30.
It is good to fine-tune the interval.

Similarly, when the forming directions of the cuts 27 and 29 are not exactly orthogonal to the conveying direction of the double-faced corrugated board 25, the double-faced corrugated board 25 stacked in the stacker 31 has its upper end as the stacking state progresses. The side shifts in the width direction (the direction perpendicular to the paper surface in FIG. 1).
That is, depending on the size of the deviation of the cut positions 27, 29 of the double-faced corrugated board 25 in the left-right direction (the direction perpendicular to the paper surface in FIG. 1) of the arrangement position along the vertical direction with respect to the vertical plane, You can confirm that the direction is not set correctly. Therefore, the positions of the rotary shafts (not shown) of the cutter drum 32 and the anvil 33 of the front liner cutting means 28 are adjusted in accordance with the deviation of the positions of the cuts 27, 29 of the double-faced corrugated board 25 along the vertical direction with respect to the vertical plane. It is advisable to shift the positions of the rotary shafts (not shown) of the cutter drum 32 and the anvil 33 of the back liner cutting means 30 along the transport surface of the double-faced corrugated board 25.

In this way, the double-faced corrugated board 25 of a predetermined length stacked in the zigzag state on the stacker 31 is sent to a printing box making machine (not shown), and predetermined printing is performed on the basis of the cuts 27 and 29. . In this case, the printing surface of the double-faced corrugated board 25 has already been warped and is in a smooth state, so that a normal printing apparatus can be used as it is. Then, without cutting the notches 27 and 29, it may be cut into a developed shape corresponding to the corrugated board box. Prior to this, scoring is performed to obtain a corrugated board box having a predetermined shape.

In this embodiment, the double-faced corrugated board 25 is alternately cut into the front liner 13 side and the back liner 14 side 27, 2
9 is engraved, but this double-sided corrugated board 25
Is engraved with perforations that penetrate intermittently in its thickness direction,
It is also possible to fold the double-faced corrugated board 25 in a zigzag state along the perforations. In this case, the pair of air nozzles described above are used as the corrugated board folding means of the present invention, and the perforated portions are alternately bent in the opposite directions by the pressure of the compressed air blown from these air nozzles, and stacked in a zigzag state on the stacker 31. And good.

When the perforation as described above is engraved on the double-faced corrugated board 25, a pair of cutter drums and anvils facing each other with the double-faced corrugated board 25 in between are used, and the cutter drum and the rotation axis of the cutter drum are opposed to each other. Parallel straight cutter knives can be provided on the cutter drum.

In the present embodiment, the double-faced corrugated board with a single middle shin is used. However, if it is a cardboard with liners on both front and back sides, for example, double-sided corrugated board with two or more middle shins or double-sided corrugated board The present invention can also be applied to a cardboard box using double-sided cardboard. In this case, it is needless to say that the depth of the cut must be formed so that the corrugated board can be easily folded from these cuts.

[0037]

According to the present invention, the front liner cutting means and the back liner cutting means are provided with continuous notches at predetermined intervals on both front and back sides of a continuous corrugated cardboard, and the notches are alternately folded back to form a zigzag pattern. Since it is folded in and folded back to the stacker, the warpage of the corrugated board can be automatically corrected.

Similarly, perforations are engraved at predetermined intervals on a continuous strip of corrugated cardboard by means of perforations.
Since the perforations are alternately folded back by the corrugated board folding means and folded in zigzags and stacked back on the stacker, the warpage of the corrugated board can be automatically corrected.

Further, based on the stacking condition of the corrugated board on the stacker, the notch or perforation spacing,
In addition, since it is possible to easily determine the deviation of the notch or the setting in the direction of the perforations, it is possible to stack the corrugated cardboard on the stacker while preventing a problem such as collapse of the corrugated cardboard.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a schematic structure of a corrugator incorporating an embodiment of a corrugated board straightening apparatus according to the present invention.

FIG. 2 is a perspective view showing an operation concept of a front liner cutting means and a back liner cutting means in the present embodiment.

[Explanation of symbols]

 11 Nakashin 12 Rolling base paper 13 Front liner 14 Back liner 15, 16 Rolling base paper 17-19 Mill roll stand 20 Auto splicer 21 Preheater 22 Single sided corrugated board 23 Single facer 24 Glue machine 25 Double sided corrugated board 26 Double facer 27 Cut 28 table Liner cutting means 29 Cutting 30 Back liner cutting means 31 Stacker 32 Cutter drum 33 Anvil 34 Cutter knife 35 Knife holder 36 Pallet

Claims (6)

[Claims] 1. A step of continuously transporting strip-shaped corrugated boards having liners on both front and back surfaces, a step of alternately forming notches on the front and back surfaces of the strip-shaped corrugated board at predetermined intervals, respectively. And a step of alternately folding the notched portions engraved across the width direction of the corrugated cardboard and stacking the corrugated cardboard in a zigzag manner. 2. A corrugator for sending out belt-shaped corrugated cardboard with liners attached to both front and back surfaces, and a corrugator provided on the front liner side of the belt-shaped corrugated cardboard sent out from this corrugator. A front liner notch means for engraving notches at a predetermined interval, and a half pitch with respect to the interval of the notches carved by the front liner notch means provided on the back liner side of the corrugated cardboard sent out from the corrugator. The back liner notch means for making notches at predetermined intervals on the back liner side of this corrugated board in the widthwise direction in a shifted state, and the notch portion formed by these front liner notch means and back liner notch means alternately. A stacker that folds the cardboard into a zigzag stack and stores it A cardboard warp correction device characterized in that 3. A step of continuously transporting strip-shaped corrugated cardboards having liners on both front and back surfaces, a step of alternately forming notches on the front and back surfaces of the strip-shaped corrugated board at predetermined intervals, and Stacking the corrugated board in a zigzag manner by alternately folding the notched portions engraved in the width direction, and correcting at least one of the notch spacing and the cutting direction based on the stacked state of the corrugated board. A method of straightening corrugated cardboard, which comprises: 4. A step of continuously carrying a belt-shaped corrugated cardboard having liners on both front and back sides, a step of forming perforations on the belt-shaped corrugated cardboard at predetermined intervals, and a widthwise direction of the corrugated cardboard. A method of straightening the warp of a corrugated board, comprising the steps of alternately folding the perforated portions engraved with each other and stacking the corrugated board in a zigzag manner. 5. A corrugator for sending out corrugated cardboard with liners attached to both front and back surfaces, and a corrugated cardboard sent out from this corrugator, facing the corrugator, and perforated at predetermined intervals in the width direction of the corrugated cardboard. Perforation cutting means to be engraved, corrugated cardboard folding means for alternately bending the perforations formed by the perforation cutting means, and the corrugated cardboard folded alternately by the corrugated cardboard folding means in a zigzag stacked state. A warp correction device for cardboard, which is equipped with a stacker for storing. 6. A step of continuously transporting a belt-shaped corrugated board having liners on both front and back surfaces, a step of forming perforations on the belt-shaped corrugated board at predetermined intervals, and a widthwise direction of the corrugated board. Stacking the cardboard in a zigzag by alternately folding the perforated portions engraved with, and correcting at least one of the perforation spacing and the perforation direction based on the stacked state of the corrugated board. A method for straightening corrugated board which is characterized by including: