JP2020142313A - Punching die for cardboard sheet and method for punching cardboard sheet - Google Patents

Abstract

To provide a punching die for a cardboard sheet that can omit a process of removing remaining whisker-like chips by simultaneously cutting off the whisker-like chips that may be generated on a center core of a cut end face, when punching out a cardboard product from a cardboard sheet.SOLUTION: A punching die 16 for a cardboard sheet is interposed between a front surface liner S2 and a back surface liner S1 and is used for punching out a blank to be punched out from a cardboard sheet S having a corrugated center core N, where a blade 20 for blank-punching that punches out the blank to be punched is provided on one surface 22 of the die. A blade 26 for cutting whisker-like chips is attached in a direction orthogonal to an extending direction of the blade 20 for blank punching so that the blade protrudes over a first prescribed height from the one surface 22 depending on a thickness of a cardboard sheet S and cut the whisker-like chips that may be generated in the center core N, which protrudes over a second prescribed height from the one surface 22 depending on the thickness of the cardboard sheet S.SELECTED DRAWING: Figure 1

Description

The present invention relates to a punching die for a corrugated cardboard sheet and a punching method for a corrugated cardboard sheet. More specifically, when punching a punching blank which is a corrugated cardboard product from a corrugated cardboard sheet, there are many variations in the occurrence position and the mode regardless of the punching mode. The present invention relates to a corrugated cardboard sheet punching die and a corrugated cardboard sheet punching method capable of omitting a step of separately removing the remaining corrugated cardboard-like chips by simultaneously cutting and separating the beard-like chips that may be generated in the core of the cut end face.

As a packaging box used for storing or moving objects, a corrugated cardboard box manufactured by assembling a punched blank, which is a corrugated cardboard product, has been conventionally used. The top lid and bottom plate of the corrugated cardboard box are formed by forming a ruled line or a slit in a part of a punched blank and folding the separated portions so as to overlap each other.

Here, when a punched blank is cut using a cutting tool, a thin whiskers are formed on the cut end face as shown in FIGS. 10 and 11 (showing a situation in which the cut blank is partially crushed for clarity). There was a problem that the shape of cutting waste G remained. More specifically, a punched blank cut by a cutting tool usually has a structure in which a corrugated core is arranged between a front liner and a back liner, and the core has a stepped top. Since it is attached to both liners via the wire, the middle part between the peak part and the valley part of the core is crushed in a substantially Z shape by the pressing between the cutting blade and the receiving blade at the time of cutting. The cutting line may not be parallel to the corrugated direction of the core and may cross multiple peaks and valleys diagonally. Therefore, the core portion becomes thin cutting chips, which are connected to the cut end face of the corrugated cardboard and hang like a whiskers and remain. The fine cutting chips may have a length of more than 10 mm to 300 mm and a width of 1 to 2 mm.
Such whiskers-like chips are foreign substances, and in particular, for corrugated cardboard boxes that store food inside, their removal is essential for hygiene management, and in a state where a plurality of punched blanks before assembling the box are laminated. , The whiskers-like chips exposed on the outer peripheral surface of the laminate were removed manually or by a suction machine, but this work was a laborious work. In particular, the punched blanks are usually bundled and delivered in a laminated state, and the whiskers-like chips exposed on the outer peripheral surface of the laminate can be removed in the laminated state. Since the cut end face forming the slit is located inside the punched blank, it is difficult to remove it in a laminated state.
A foreign matter removing technique that omits such work has been proposed.

For example, Patent Document 1 relates to a cutting blade, more specifically, a cutting blade that cuts a sheet material while rotating, and is arranged on a fan-shaped blade main body and an outer peripheral portion of the blade main body. The cutting blade portion is provided in a region excluding both ends of the arc-shaped first cutting blade and the arc-shaped first cutting blade formed along the outer peripheral portion of the blade body. (1) A second cutting blade is provided along the cutting blade, which is arranged at a predetermined interval and cuts whisker-shaped cutting chips remaining on the cutting end face of the sheet material.
Because the machined cutting tool for cutting is configured to include a plurality of second cutting blades provided so as to project outward from the first cutting blade, which is a blade for cutting the sheet material to form a slit. , When the second cutting blade comes out from the lower side to the upper side of the sheet material, the second cutting blade enters between the thin whisker-shaped cutting waste formed on the cutting end face and the cutting end face and cut waste. Can be cut off. As a result, it is possible to prevent whisker-shaped cutting chips from remaining on the sheet material after slitting, and to make the cut surface formed when the sheet material such as a punched blank is cut clean. it can.

However, in Patent Document 1, whisker-shaped cutting chips are cut at the same time as punching the punched blank, but in cutting whisker-shaped cutting chips generated in the elongated slits formed inward from the outer peripheral surface of the punched blank. It does not cut the whisker-shaped cutting chips generated on the outer peripheral cut end face of the punched blank.
In this regard, Patent Document 2 discloses a technique for cutting whisker-shaped cutting chips generated in connection with the outer peripheral cutting end face of a punched blank.

More specifically, if a cut is made parallel to the corrugated board step, the cut is made into the corrugated board parallel to the step to prevent the core whiskers from remaining on the cut surface along the cut. It is a cutting edge that is formed at regular intervals, leaving a gap between the cutting edge, and the tip of the cutting edge body is provided with a recess for forming a seam between the cutting edge for forming a cut and the adjacent cutting edge. Diagonal bends are provided at both ends, and recesses for forming joints are formed at the inner end of the recess between the tips of adjacent diagonal bends, and the whiskers of the corrugated cardboard core generated from both ends of the seam when forming a cut are bent diagonally at the cutting edge. It discloses a configuration in which a cut can be formed while cutting at a portion.
According to such a configuration, since the cutting edge for forming the cut is provided with the diagonally bent portion, when the cut is formed parallel to the step of the corrugated cardboard, the whiskers generated by the core at the diagonally bent portion are cut off. Even when the cutting line on the cut side is located on the kuwae side of the reverse threading that is gripped by the transport means, the cutting line does not have a whiskers, so the whisker removing action that was conventionally required is unnecessary. Can be.

However, in Patent Document 2, there are the following technical problems due to the punching mode of the corrugated cardboard sheet.
That is, it is not possible to deal with whisker-like chips that may occur in the core of the cut end face having many variations in the generation position and mode.
More specifically, first, in Patent Document 2, a punched product is obtained in two steps, the first step is to provide a side for making a cut while leaving a joint, and the second step is a protruding blade. The punched product and the punched scrap are separated by dropping the punched waste through the joint, and only the whiskers with the joint as the base point are targeted, and the punching formed by the blank punching blade is used. It does not cover whisker-like chips that may occur in the core of the cut end face of the blank.
In this respect, whiskers having a joint as a base point have few types of generation positions and modes, whereas whiskers-like chips that can be generated at the core of the cut end face have many variations in generation positions and modes. ..

Secondly, in Patent Document 2, in order to cut a mustache-like chip having a base point at the joint while providing a joint and a cut on one side of the punched product, an inverted C shape is formed around the joint. Since a pair of diagonally bent portions are provided, the position of the joint must be located inside the punched product rather than the position of the cut by the linear cutting edge, and the diagonally bent portion cooperates with the linear cutting edge. Since there is a cut up to the joint, the cutting edge of the straight cutting edge and the diagonally bent part must be aligned in the height direction, so that there are as many diagonally bent parts as there are on one side of the punched product. While having an adverse effect on the outer shape of the product due to the occurrence of recesses, it is not possible to handle so-called full cutting (complete punching) or half cutting (incomplete punching) depending on the punched product.

In short, in Patent Document 2, in order to obtain a punched product in two stages, in one side where a joint is left and a cut is made in the first stage, a whiskers that may occur around the joint are removed, and then the second stage is obtained. Because we pay attention to separating the punched product and the punched waste by the protruding blade at the stage, a pair of inverted C-shaped diagonally bent portions are provided around the joint at each joint, while each diagonally bent portion is provided. , The cutting edge portions of each other are aligned in the height direction with respect to the linear cutting edge to be cut, and Patent Document 2 makes a joint and a cut in the first stage when a punched product is obtained in two stages. It merely discloses the technical idea of cutting the whiskers-like chips generated around the joints, and the whiskers that occur on the cut end face in many variations in the position and mode of punching the punched blank from the corrugated sheet. It does not disclose the technical idea of cutting the state chips.

Patent No. 6010789 JP-A-2002-154173

In view of the above technical problems, an object of the present invention is to provide a core of a cut end surface having a large number of variations in the generation position and mode when punching a punched blank which is a corrugated cardboard product from a corrugated cardboard sheet, regardless of the punching mode. Another object of the present invention is to provide a corrugated cardboard sheet punching die capable of omitting the step of removing the remaining whiskers-like chips by cutting and separating the possible whiskers-like chips at the same time.

In order to achieve the above problems, the corrugated cardboard sheet punching die of the present invention is used.
Used to punch a punched blank from a corrugated cardboard sheet that has a corrugated core that is interposed between the front liner, the back liner, and both liners and is bonded via both liners and the top of the step. A die for corrugated cardboard sheets
A blank punching blade for punching a punched blank is provided on one surface, and the blade of the blank punching blade is positioned so that the advancing direction of the waveform of the core is orthogonal to the extending direction of the blank punching blade. Depending on the thickness of the corrugated cardboard sheet, the punched blank is projected from one surface over a first predetermined height so that the blank can be punched.
Further, in order to cut the whiskers-like chips that may be generated in the core of the cut end face of the punched blank formed by the blank punching blade, at least one side of the blank punching blade extends in the extending direction. A blade for cutting whiskers is attached,
The whiskers-shaped chip cutting blade is provided in a direction intersecting the extending direction of the blank punching blade, and the whiskers-shaped chip cutting blade has one surface depending on the thickness of the corrugated cardboard sheet. The structure is such that it protrudes from the second predetermined height.

According to the corrugated cardboard sheet punching die having the above configuration, by pressing one surface of the corrugated cardboard sheet punching die against the corrugated cardboard sheet, the blank punching blade can be pressed from the front surface or the back surface of the corrugated cardboard sheet. It is possible to punch a punched blank by penetrating the inside of the sheet and the core and the back surface or the front surface in the thickness direction of the corrugated cardboard sheet.
When the blank punching blade cuts out the core while crushing the waveform of the core in a substantially Z shape, the middle part between the peak and valley parts of the core is cut in a roughly Z shape. The Z-shaped crushed part is cut in a state where it is crushed diagonally instead of parallel to the peaks and valleys, so that the cutting line is not parallel to the corrugated direction of the core and multiple peaks. Since whiskers and valleys may be crossed diagonally, whisker-like chips of the core are generated on the cut end face of the core, but on at least one side with respect to the extension direction of the blank punching blade, A whiskers-shaped chip cutting blade is attached, and since the whiskers-shaped chip cutting blade is provided in a direction intersecting the extension direction of the blank punching blade, a whiskers-shaped cutting that may occur in the core of the cut end face. Even if there are many variations in the position and mode of the debris, the beard-shaped chip cutting blade extends from the front or back surface of the cardboard sheet to the inside of the cardboard sheet, and the whiskers are formed when the punching blank is punched. It is possible to cut the slabs at the same time and separate and remove them from the punched blank.
Therefore, it is possible to omit the step of separately removing the remaining whiskers-like chips after punching the punched blank.

Further, the blank punching blade has a wavy shape in which the edge portion of the blade edge has peaks and valleys in the vertical direction.
Further, when punching a punching blank, a urethane blade receiving plate having a thickness capable of biting into the valley portion of the blank punching blade is provided so as to face the corrugated cardboard sheet punching die, and the whiskers-like chips are provided. The level of the cutting edge edge portion of the cutting blade is preferably provided between the valley portion and the peak portion of the blank punching blade.
Furthermore, the blank punching blade and the whisker-shaped chip cutting blade may be integrally formed as a plan-view L-shaped blade.

In order to achieve the above problems, the punching method for corrugated cardboard sheets of the present invention is:
A front surface liner provided with a blank punching blade for punching a punched blank and a whisker-shaped chip cutting blade provided in a direction intersecting the extending direction of the blank punching blade on one surface. , The stage of preparing a die for a corrugated cardboard sheet having a corrugated core that is interposed between the back liner and both liners and is bonded via both liners and the top of the step.
A step of positioning the corrugated cardboard sheet so that the advancing direction of the waveform of the core is orthogonal to the extending direction of the blank punching blade.
By pressing the blank punching blade for corrugated cardboard sheet and the beard-shaped chip cutting blade against the corrugated cardboard sheet, the punched blank is punched from the corrugated cardboard sheet, and at the time of punching, the cut end face by the blank punching blade is used. The structure includes a step of cutting the generated whiskers-like chips and separating them from the punched blank.

A first embodiment of a punching system having a corrugated cardboard sheet punching die according to the present invention will be described in detail below with reference to the drawings.
As shown in FIG. 1, the punching system 10 includes a paper feeding device (not shown) for feeding the corrugated cardboard sheet S and a punching device arranged above and below the corrugated cardboard sheet S fed by the paper feeding device. It has 14.
In the following, the corrugated cardboard to be punched by the punching system 10 is referred to as a corrugated cardboard sheet S, and the corrugated cardboard that is a product punched by the punching system 10 is referred to as a punching blank SS, and the extending direction of the waveform of the core N of the corrugated cardboard sheet S is defined as , It is assumed that it means the direction X as shown in FIG.
The paper feeding device is, for example, a conventionally known device for positioning the corrugated cardboard sheet S on the upper surface of the lower plate 13, and a plurality of whisker-shaped chip cutting blades 26 of the corrugated cardboard sheet punching die 16 described later are installed. It is configured to be positioned so that the extending direction X of the waveform of the core N of the corrugated cardboard sheet S coincides with the orientation.
The punching device 14 has a lower plate 13 made of a steel plate and an upper plate 11 arranged to face the upper side of the lower plate 13, and the corrugated cardboard sheet punching die 16 described later is horizontally oriented with the punching blade facing downward. This is a known device that reciprocates the corrugated cardboard sheet S positioned on the upper surface of the lower plate 13 in the vertical direction between the reserve position P1 and the extraction position P2 in a fixed state. The lower plate 13 and the upper plate 11 are relatively movable in the vertical direction. In the embodiment, the upper plate 11 is fixed and the lower plate 13 can be raised and lowered, but the upper plate 11 may be raised and lowered and the lower plate 13 may be fixed, or both the lower plate 13 and the upper plate 11 may be fixed. May be able to move up and down so as to move up and down in opposite directions.
With such a configuration, the corrugated cardboard sheet S positioned on the upper surface of the lower plate 13 by the paper feeding device is moved from the reserve position P1 to the punching position P2, so that the blank punching blade (described later) is the corrugated cardboard sheet S. The front surface S2, the core N, and the back surface S1 are made to penetrate in the thickness direction of the sheet.

The corrugated cardboard product (stamped blank SS) has a corrugated core N interposed between the front surface S2 liner, the back surface S1 liner, and both liners, and an adhesive is applied to the corrugated step top. It is a double-sided punched blank SS formed by laminating with both liners after being applied.
For corrugated cardboard, the type of flute and the number of steps are specified in JIS Z 1516. The number of steps for the A flute is 34 ± 2 mountains / 30 cm, the number of steps for the B flute is 50 ± 2 mountains / 30 cm, and the number of steps for the C flute is 40 ± 2 mountains / 30 cm. Although the step height of corrugated cardboard is not specified in JIS, it is a characteristic that directly affects the thickness of the punched blank SS, and users who purchased corrugated cardboard use an automatic box making machine to pack the contents in a box. This is an extremely important characteristic because it is necessary to set the thickness gap of the automatic box making machine according to the sheet thickness when sealing, and in actual transactions, the step height of the A flute = 4.5. ~ 4.8 mm, step height of B flute = 2. 5-2. It is produced and traded at 8mm.
In the corrugated cardboard product (punched blank SS) to which the present invention can be applied, the height of the blank punching blade 20 and the whiskers-shaped chip cutting blade 26 described later from one surface 22 of the corrugated cardboard sheet punching die 16 is appropriately adjusted. As long as it is selected, any flute type double-sided punched blank SS may be used, or a single-sided punched blank SS having a liner provided on only one side may be used. Similarly, the core N may be a single flute or a double flute as long as the heights of the blank punching blade 20 and the whiskers-shaped chip cutting blade 26, which will be described later, are appropriately selected.
As shown in FIG. 2, the corrugated cardboard product (punched blank SS) punched from the corrugated cardboard sheet S is a rectangular product composed of two pairs of facing sides 52 and 54, and one set of pairing facing sides. In each of the 54, elongated slits 42 (three in the drawing) spaced apart from each other in the longitudinal direction of the sides are formed, and one side 53 of the pair of opposite sides 52 of the other set is a rectangular corrugated cardboard sheet S. It is more cut. Therefore, when the corrugated cardboard sheet S is punched, punching waste D is generated by punching each elongated slit 42, and punching waste D is generated by punching one side 53 of a pair of opposite sides of the other set. Become.

In the following, the corrugated cardboard sheet punching die 16 fixed to the punching device 14, and the method of punching a corrugated cardboard product (punching blank SS) by using such a corrugated cardboard sheet punching die 16, which is a feature of the present invention. , Explain in detail.

As shown in FIG. 3, the corrugated cardboard sheet punching die 16 has a linear groove for press-fitting and fixing the blank punching blade 20S and a U for press-fitting and fixing each of the blank punching blade 20U on one surface 22. A wooden flat plate in which each of the character groove and the short groove for press-fitting and fixing each of the whiskers-shaped chip cutting blade 26 is formed by, for example, laser processing, and the punching blade is press-fitted and fixed in these grooves. Yes, it is used for punching corrugated cardboard products (punched blank SS), and in the punching device 14, the blank punching blade 20 is arranged so as to punch a single corrugated board product (punched blank SS) by one punching. ing.
More specifically, a blank punching blade 20 is provided on one surface 22, and the blade of the blank punching blade 20 is a corrugated cardboard product (punched blank SS) according to the thickness of the corrugated cardboard product (punched blank SS). Projects from one surface 22 over a predetermined height h1 so that the corrugated cardboard can be punched out.
On one surface 22, a plurality of U-shaped blank punching blades 20U (six in the drawing) forming an elongated slit 42 provided in the corrugated cardboard product, and a straight line for cutting a part of the corrugated cardboard sheet S, respectively. A cutting tool 20S for punching a corrugated cardboard is provided.
Each of the blank punching blades 20U is composed of a parallel straight portion facing each other and a straight portion connecting the parallel straight portions.
Of the plurality of U-shaped blank punching blades 20U, half of the three U-shaped blank punching blades 20U are a pair of opposite sides 52A and B of the rectangular cardboard sheet S, and the other half. The three U-shaped blank punching blades 20U are provided corresponding to the other sides of the pair of facing sides 52A and B of the rectangular cardboard sheet S, and each U-shaped blank punching blade 20U is provided. The U-shaped blank punching blade 20U has a pair of opposite sides 52A and B so that the punching scrap D corresponding to the elongated slit 42 can be formed so as to form the elongated slit 42 by punching. It is provided so as to straddle the corresponding sides.
Therefore, the length L of the U-shaped blank punching blades 20U, the distance w between the corresponding sides, and the blank punching blades 20U facing each other in the direction orthogonal to the extending direction X of the waveform of the core N of the corrugated cardboard sheet S. The interval D may be appropriately set according to the shape of the elongated slit 42 to be formed.
On the other hand, the linear blank punching blade 20S has a blade length L longer than the distance between the pair of opposite sides 52 of the corrugated cardboard sheet S so that a part of the corrugated cardboard sheet S can be cut (at the right end in the drawing). Provided to have.
The center lines of each U-shape of the blank punching blade 20U are arranged parallel to each other, parallel to the extending direction of the straight line of the blank punching blade 20S, and orthogonal to the extending direction X of the waveform of the core N of the corrugated cardboard sheet S. It is arranged in the direction of
The blank punching blade 20 has a V-shaped cross section having a tip forming a tip, and is formed of, for example, a metal material such as cast iron, stainless steel, iron, or tool steel.
Both the blank punching blade 20U and the blank punching blade 20S are configured as a blank punching blade 20 as a whole by arranging thin plate-shaped straight blades or arranging a plurality of thin plate-shaped straight blades. Alternatively, the blank punching blade 20 may be formed by forming a single thin plate-shaped straight blade.

Further, a beard-shaped chip cutting blade 26 is similarly provided to the blank punching blade 20 by a press-fitting method in the linear groove, and the blade of the whiskers-shaped chip cutting blade 26 is provided. Is a V-shaped cross section having a tip forming a tip, similarly to the blank punching blade 20, and projects from one surface 22 over a predetermined height h2 according to the thickness of the corrugated cardboard product (punched blank SS). .. The whiskers-shaped chip cutting blade 26 has a predetermined height (so-called all-cut type) capable of cutting both the front surface S2 liner and the back surface S1 liner together with the core N. The whiskers-shaped chip cutting blade 26 may have a straight line view or a wavy shape in a plan view, depending on the requirements of the punching blank SS.
The whiskers-shaped chip cutting blade 26 is made of metal like the blank punching blade 20, and is provided so as to be orthogonal to the extending direction of the corresponding blank punching blades 20S and U, respectively. The angles of the corresponding blank punching blades 20S and U with respect to the extending direction are preferably orthogonal to each other, but the angle is not limited to this, and a whisker-shaped cutting derived from the core N that may occur on the cut end surface of the blank punching blade 20 Any angle may be used as long as the waste G can be cut, except for the direction along the extending direction of the corresponding blank punching blades 20S and U.
The whiskers-shaped chip cutting blade 26 has an end surface 90 having a shape that matches one inclined surface of the V-shaped cross section of the blank punching blades 20S and U, and is continuously continuous from the cutting edge of the blank punching blade 20. The tip portion that extends and is opposite to the blank punching blade 20 side is a free end (see FIGS. 5 to 7).
In this case, it is not necessary to extend seamlessly from the inclined surface of the blank punching blades 20S and U, and as long as the whiskers-like chips G generated on the cut end face of the corrugated cardboard product (punched blank SS) can be cut, it is suitable for blank punching. The blades 20S and U may be separated from the inclined surface. That is, as long as the whiskers-shaped chip G can be cut when the whiskers-shaped chip cutting blade 26 is punched, for example, when the blank punching blade 20 has a corrugated shape in a plan view, the core of the cardboard sheet S There may be a gap between the blade of the blank punching blade 20 arranged in a direction orthogonal to the extending direction X of the waveform of N and the blade for cutting whiskers-like chips 26. When the whiskers-shaped chip cutting blade 26 is installed in the same direction as the direction along the cutting end face of the cardboard sheet S, the whiskers-shaped chip cutting blade 26 cannot cut the whiskers-shaped chips G, but blank punching is performed. The gap between the blade of the blade 20 and the blade 26 for cutting whiskers is the possible location of the whiskers G derived from the core N that can be generated on the cutting end face, and the length of the scraps. From the viewpoint, it may be determined as appropriate.

In the present embodiment, an elongated slit 42 is provided on the outer peripheral edge 18 of the corrugated cardboard product (punched blank SS), and a whisker-shaped chip cutting blade 26 is also provided on the side of the frame constituting the elongated slit 42.
As a modification of the arrangement of the whisker-shaped chip cutting blade 26 with respect to the elongated slit 42, in FIG. 4A, the elongated slit 42 is provided on each of the pair of opposite sides 52A and 52B of the corrugated cardboard product (punched blank SS). As shown in FIG. 4B, in the corrugated cardboard sheet punching die 16, one set of long sides 56A and 56B is used instead of one set of long sides 56A and 56B facing each other of the frames constituting each elongated slit 42. A whisker-shaped chip cutting blade 26 is provided on the bottom 58 connecting the two.
More specifically, each of the pair of facing sides 52A and 52B of the corrugated cardboard product (punched blank SS) is provided with an elongated slit 42 extending inward, which corresponds to the opposing long sides 48A and 48B of the elongated slit 42. Blank punching blades 20 are provided on the corresponding one sides 56A and 56B of the corrugated cardboard sheet punching die 16 and the corresponding bottom edge 58 of the corrugated cardboard sheet punching die 16 corresponding to the bottom 50 of the elongated slit 42. A whisker-shaped chip cutting blade 26 extending inward of the frame in a direction orthogonal to the base 58 is provided.

More specifically, elongated slits 42 are provided from one sides 52A and 52B of the frame corresponding to the outer peripheral edge of the corrugated cardboard product (punched blank SS), and whisker-shaped chips are cut at the bottom 58 corresponding to the bottom 50 of the elongated slit 42. A cutting tool 26 is provided. As a result, a notch C is also formed in the bottom portion 50 connecting the pair of opposite sides 48A and 48B forming the elongated slit 42. As a result, when a plurality of punched corrugated cardboard products (punched blank SS) are laminated and bundled with a band B and delivered as a product, the side surface composed of a pair of opposite sides 52A and 52B of each corrugated cardboard product (punched blank SS) is formed. Although it is exposed to the outside, the side surface formed by the bottom 50 corresponding to the bottom of the elongated slit 42 is not exposed to the outside. Therefore, at the same time as the punching of each corrugated cardboard product (punched blank SS), the elongated slit 42 The point where the whiskers G generated on the bottom side 50 (cut end face) corresponding to the bottom part is cut and separated is on the side surface formed by each pair of opposite sides 52A and 52B of each corrugated cardboard product (punched blank SS). It is much more effective than cutting and separating the generated beard-shaped chips G.

A plurality of whisker-shaped chip cutting blades 26 are provided at predetermined intervals in the extending direction of the corresponding blank punching blades 20S and U.
The predetermined interval may be determined from the viewpoint of being separable from the corrugated cardboard product (punched blank SS) by cutting the beard-shaped chips G that are expected to be generated at the same time when punching, but the paper is fed by the paper feeding device. Depending on the position of the corrugated cardboard sheet punching die 16 with respect to the corrugated cardboard sheet S, beard-shaped chips G derived from the core N may be generated on the cut end surface of the outer peripheral edge constituting the outer shape of the corrugated cardboard product (punched blank SS). Even if whiskers G are generated on a certain cut end face, the middle part between the peak part and the valley part of the core N is cut in a substantially Z-shaped crushed state. As a result, the Z-shaped crushed part is cut in a state where it is crushed diagonally rather than parallel to the peaks and valleys, so that the cutting lines are not parallel to the waveform direction of the core N but multiple. The length of the beard-shaped chips G generated may be determined by the degree of diagonal crossing of the peaks and valleys of the corrugated cardboard. Therefore, assuming such a situation, the predetermined interval and the blade length l should be set. It is preferable to determine.
For example, the predetermined interval is 1/4 to 1/2 of the length of the corresponding blank punching blades 20S, U in the extending direction, and specifically, 10 mm to 300 mm is preferable.
The length extending orthogonally to the extending direction from the corresponding blank punching blades 20S and U is preferably half a wavelength or less of the waveform of the core N, and is preferably 1 mm to 10 mm, for example.

The number and arrangement of the whisker-shaped chip cutting blades 26 for each of the corresponding blank punching blades 20S and U need not be the same. For example, a blank punching blade 20 may cut a plurality of whiskers-shaped chips. While the blades 26 are installed at equal intervals, some blank punching blades 20 do not have to install a plurality of whisker-shaped chip cutting blades 26 at equal intervals, and some blank punching blades 20 are single. One whiskers-shaped chip cutting blade 26 may be installed in the center, while a blank punching blade 20 may have a plurality of whiskers-shaped chip cutting blades 26 installed at equal intervals.

As shown in FIG. 5, the whiskers-shaped chip cutting blade 26 has a thin plate-shaped base 38, and the elongated upper surface 32 of the thin plate-shaped base 38 has a blade body portion having a blade length l larger than the blade thickness w. 34 may be provided, and the blade main body 34 may have a reinforcing portion 40 whose width in the extending direction of the elongated upper surface 32 is tapered from the elongated upper surface 32 toward the blade main body 34. For example, the elongated upper surface 32 of the thin plate-shaped base 38 may be formed in a stepped shape, and the blade main body 34 may be provided on the top surface thereof.
As shown in FIG. 6, as a modification, the whiskers-shaped chip cutting blade 26 includes a block-shaped base portion 30 having a rectangular bottom surface 28 and a blade main body portion 34 protruding upward from the upper surface 32 of the block-shaped base portion 30. The blade main body portion 34 has an elongated thin plate shape having a blade length l larger than the blade thickness w, and a rectangular bottom surface 28 is fitted and fixed or press-fitted into one surface 22 of the corrugated cardboard sheet punching die 16. A fixable opening (not shown) is provided. As a result, it is possible to firmly fix the beard-shaped chip cutting blade 26, which has a smaller pressure receiving area during punching than the blank punching blade 20, to one surface 22 of the corrugated cardboard sheet punching die 16. ..
As shown in FIG. 7, as another modification, the beard-shaped chip cutting blade 26 has a corrugated cardboard-shaped block-shaped base 37 whose diameter is reduced toward the tip, and an upper surface of the conical block-shaped base 37. The blade main body 34 has a blade main body 34 protruding from the blade, and the blade main body 34 is in the shape of an elongated thin plate having a large blade length l with respect to the blade thickness w, and one surface 22 of the corrugated cardboard sheet punching die 16 has a cone. A circular opening (not shown) that can be fixed by fitting or press-fitting the circular bottom surface 39 of the conical block-shaped base 37 may be provided.
The corrugated cardboard sheet S is punched so that the extending direction of the blank punching blade 20 of the corrugated cardboard sheet punching die 16 is orthogonal to the extending direction of the corrugated portion of the core N of the corrugated cardboard sheet S. Position with respect to 16. By the way, the corrugated shape of the core N is not exposed in the direction orthogonal to the extending direction of the corrugated portion of the core N of the corrugated cardboard sheet S. The block-shaped base 30 and the conical block-shaped base 37 may be solid or hollow as long as the blade body 34 is protected during punching.
In this case, as shown in FIG. 8, the punching angle Θ of the core N with respect to the extending direction of the waveform does not have to be 0 °, and the whiskers derived from the core N that may occur on the cut end surface of the blank punching blade 20. As long as the state chip G can be cut, it may be inclined, and for example, 0 ° to 10 ° is an allowable range.

An appropriate number of planar elastic bodies (not shown), for example, sponges are arranged on one surface 22 at appropriate positions, and after the corrugated cardboard product (punched blank SS) is punched by the punching device 14. When the lower plate 10 is moved downward from the punching position P2 to the reserve position P1, the blank punching blade 20 and / or the whisker-shaped chip cutting blade 26 remains biting into the corrugated cardboard product (punched blank SS). The corrugated cardboard sheet punching die 16 and the corrugated board product are pressed by pressing the corrugated board sheet punching die 16 against the corrugated board product (punched blank SS) so that the corrugated board product (punched blank SS) can be smoothly separated. A repulsive force that separates the cardboard from the (punched blank SS) is generated.
Further, on one surface 22, a punch or a convex body (FIG.) for imparting a ruled line NN to the corrugated cardboard product (punched blank SS) for use as a crease when assembling the corrugated cardboard product (punched blank SS) into a corrugated cardboard box. (Not shown) are provided at appropriate positions, for example, on a line connecting the vertices of each elongated slit 42, or in an appropriate number.

The operation of the punching system 10 having the above configuration will be described below as a punching method for the punching blank SS using such a punching system.
First, a linear groove for press-fitting and fixing the blank punching blade 20S, a U-shaped groove for press-fitting and fixing each of the blank punching blade 20U, and a whiskers on one surface 22 of the corrugated cardboard sheet punching die 16. Each of the short grooves for press-fitting and fixing each of the corrugated cardboard cutting blades 26 is formed by, for example, laser processing.
Next, using the formed linear groove, U-shaped groove, and short groove, a blank punching blade 20 arranged according to the desired punching outer shape of the corrugated cardboard product (punched blank SS) is provided, and each blank punching is provided. In the corrugated cardboard 20S and U, a beard-shaped chip cutting blade 26 extending from each is provided, and for example, it is press-fitted and fixed in each groove 25 of one surface 22.
Next, the corrugated cardboard sheet S is placed on the corrugated cardboard sheet punching die 16 by the paper feeding device so that the blank punching blades 20S and U are oriented in the direction orthogonal to the extending direction of the corrugated portion of the core N of the corrugated cardboard sheet S. Position. The punching angle Θ of the core N with respect to the extending direction of the waveform is not oriented in the orthogonal direction as long as the beard-shaped chips G generated on the cut end face of at least one side of the corrugated cardboard product (punched blank SS) can be cut. It may be in the range of 0 ° to 10 °.
As a result, when punching a corrugated cardboard product (punched blank SS), even if whisker-shaped chips G are generated in the core N of the punched-cut end surface by the whiskers-shaped chip cutting blade 26, whisker-shaped chips are cut at the same time as punching. It is possible to cut the waste G and thus separate and remove it from the corrugated cardboard product (punched blank SS) to be punched.
More specifically, in each blank punching blade 20U, whisker-shaped chips G that may be generated on the cut end face of the elongated slit 42, and in the blank punching blade 20S, they are generated on the cut end face that cuts the corrugated cardboard sheet S. It is possible to cut the possible whiskers G.
Next, by pressing the blank punching blade 20 and the whisker-shaped chip cutting blade 26 of the corrugated cardboard sheet punching die 16 against the corrugated cardboard sheet S, the corrugated cardboard product (punched blank SS) is punched from the corrugated cardboard sheet S, and at the same time. The whiskers-like chips G generated during punching are cut and separated and removed from the corrugated cardboard product (punched blank SS).
As shown in FIG. 2, in a corrugated cardboard product (punched blank SS), a notch C is formed in a portion punched by the blank punching blade 20 by a whiskers-shaped chip cutting blade 26, while, for example, blank punching is performed. Notches C are not formed on the opposing sides 54A and 54B that are not punched by the cutting tool 20.

In this case, the stage of preparing a plurality of whisker-shaped chip cutting blades 26 having different blade lengths l and / or predetermined height h, and the type of cardboard sheet S (double-sided cardboard, single-sided cardboard) or flute type (A, It further has a step of selecting a whisker-shaped chip cutting blade 26 to be used for whiskers-shaped chip cutting from a plurality of whiskers-shaped chip cutting blades 26 according to B, C type, and single flute or double flute). May be.
For example, when a corrugated cardboard product (punched blank SS) having the same outer shape is punched, the corrugated cardboard product (punched blank SS) is used as the blank punching blade 20 arranged on one surface 22 even if it is adopted in the same arrangement configuration. Is a single-sided punched blank SS or a double-sided punched blank SS, or if the same type of punched blank SS has different flute types, the type and / or arrangement of the whisker-shaped chip cutting blade 26 accordingly. It is better to select.

As described above, the whiskers-like chips G derived from the core N generated at the time of punching are cut at the outer peripheral edge of each corrugated cardboard product (punched blank SS) and the elongated slit 42, and separated from the corrugated cardboard product (punched blank SS). It becomes possible to do.
Therefore, it is usual to deliver a plurality of corrugated cardboard products (punched blank SS) in a laminated state, but if the peripheral side surface of the plurality of laminated corrugated cardboard products (punched blank SS) is laminated, whisker-like chips G However, it is difficult to remove the whiskers-like chips G generated in the elongated slit 42 extending inside the corrugated cardboard product (punched blank SS) after laminating. It is possible to omit the work of removing the whiskers-like chips G separately without generating them integrally with the blank SS).

According to the corrugated cardboard sheet punching die 16 having the above configuration, by pressing one surface 22 of the corrugated cardboard sheet punching die 16 against the corrugated cardboard sheet S, the blank punching blade 20 is mainly the corrugated cardboard sheet S. By extending from the front surface S2 or the back surface S1 to the inside of the corrugated cardboard sheet S and penetrating the core N and the back surface S1 or the front surface S2 in the thickness direction of the corrugated cardboard sheet S, the corrugated cardboard product (blank punching blade 20) It is possible to punch out a punched blank SS).
When the blank punching blade 20 cuts out the core N while crushing the waveform of the core N in a substantially Z shape, the intermediate portion between the peak portion and the valley portion of the core N is crushed in a substantially Z shape. It will be cut, and the Z-shaped crushed part will be cut in a state where it is crushed diagonally instead of parallel to the peak part and the valley part, so that the cutting line is parallel to the waveform direction of the core N. Since it may cross a plurality of peaks and valleys diagonally, where whisker-like chips G of the core N are generated on the cut end surface of the core N, at least one of the blank punching blades 20 A plurality of whiskers-shaped chip cutting blades 26 are provided on the side at predetermined intervals, and each whiskers-shaped chip cutting blade 26 is provided in a direction intersecting the extending direction of the blank punching blade 20. Therefore, even if there are many variations in the generation position and mode of the whiskers-like chips that can be generated in the core of the cut end face, the whiskers-shaped chip cutting blade 26 is the front surface of the cardboard sheet S. It extends from S2 or the back surface S1 to the inside of the cardboard sheet S, and at the time of punching the cardboard product (punched blank SS), the whiskers-shaped chips G are cut at the same time, and separated and removed from the punched cardboard product (punched blank SS). Is possible.
Therefore, it is possible to omit the step of separately removing the remaining whiskers-like chips G after punching the corrugated cardboard product (punched blank SS).
In this case, when the entire punching blank SS is punched from the corrugated cardboard sheet S by the corrugated cardboard sheet punching die 16, the blank punching blade 20 needs to be arranged in an annular frame shape on one surface 22. When punching only a necessary part such as an elongated slit 42 while leaving a part of the outer shape of the corrugated cardboard sheet S as in the form, the blank punching blade 20 is arranged in an annular frame shape on one surface 22. Although it is not necessary, even in such a case, the cut end surface of the corrugated cardboard sheet S punched by the blank punching blade 20 (the direction intersecting the traveling direction X of the waveform of the core N) has the core N. Since the whiskers G can be generated, the whiskers cutting blade 26 attached to the blank punching blade 20 functions effectively.

As a modification, the blank punching blade 20 may have a wavy shape in which the edge portion of the blade edge has peaks and valleys in the vertical direction, and when the punching blank SS is punched, the valley portion of the blank punching blade 20 is used as the lower plate 13. It is preferable that a urethane blade receiving plate having a thickness capable of biting into the corrugated cardboard sheet is provided so as to face the corrugated cardboard sheet punching die 16. The level of the cutting edge portion of the whisker-shaped chip cutting blade 26 is provided between the valley portion and the peak portion of the blank punching blade 20.
According to such a configuration, when punching the punched blank SS, the punched blank SS is punched from the corrugated cardboard sheet, and at the time of punching, the whiskers-like chips generated on the cut end surface by the blank punching blade 20 are cut and punched. Where it is possible to separate from the blank SS, the blank punching blade 20 and the whisker-shaped chip cutting blade 26 bite into the lower plate 13 at the same time. First, the blank punching blade 20 bites into the lower plate 13. Next, since the whiskers-shaped chip cutting blade 26 bites into the lower plate 13, it contributes to improving the durability of the whiskers-shaped chip cutting blade 26. The level of the edge portion of the cutting edge of the whisker-shaped chip cutting blade 26 and the level difference of the blank punching blade 20 with respect to the peak portion may be determined from this viewpoint.
As a further modification, as a punching mode of the punching blank SS, in the present embodiment, the blank punching blade 20 and the whiskers-shaped chip cutting blade 26 are used for punching not only in one step but also in two steps. You may.
More specifically, it is performed in two steps to obtain a punched product, the first step is to provide a side for making a cut leaving a joint, and the second step is to drop the punched waste through the joint with a protruding blade. The punched product and the punched debris may be separated by letting them or by manually tearing the punched debris.
At that time, when the blank punching blade 20 and the whiskers-shaped chip cutting blade 26 are integrally formed as a plan-view L-shaped blade and a plurality of L-shaped blades are linearly aligned, the adjacent L-shaped blades are formed. By setting the blades at a predetermined interval, the interval between the L-shaped blades is formed as a joint during the first stage punching, and the punched product and the punched waste are not separated at this stage. In the second stage, the beard-shaped chip cutting blade 26 having a shorter blade length than the blank punching blade 20 is used as the blank punching blade 20 as an L-shaped blade while being transferred by a sword and dropped by a protruding blade. By forming them integrally, it is possible to secure the strength of the whiskers-shaped chip cutting blade 26 as compared with the case where the whiskers-shaped chip cutting blade 26 is alone.
When a plan-view L-shaped blade is used, it may be used for punching at one time by aligning adjacent L-shaped blades in a straight line without a gap.

The second embodiment of the present invention will be described below with reference to FIG. 9 (the left-right direction in the drawing is the extension direction of the waveform of the core). In the following description, the same components as those in the first embodiment will be omitted by assigning similar reference numbers, and the feature portions of the present embodiment will be described in detail below.

The characteristic portion of the present embodiment is the punching mode of the corrugated cardboard sheet S. In the first embodiment, the corrugated cardboard sheet S is positioned and stopped, and the corrugated board sheet S is punched by moving the punching die up and down, so-called flat die cutter. In contrast to this method, the present embodiment is a so-called rotary die cutter method in which the corrugated cardboard sheet S is punched out by moving and passing the corrugated cardboard sheet S between the vertical rotation axes separated in the vertical direction. As a result, the corrugated cardboard sheet punching die 16 provided on one outer peripheral surface of the vertical rotation shaft has a flat plate shape in the first embodiment, whereas in the present embodiment, it has a curved surface having an arcuate cross section. It is in the shape.
As shown in FIG. 9, the rotary die cutter includes an upper rotation shaft and a lower rotation shaft, and the upper rotation shaft and the lower rotation shaft are arranged so as to be parallel to each other and to face each other across the cardboard sheet feeding line. A disk-shaped upper rotating holder 70 and a lower rotating holder 72 are provided, respectively. In the whisker-shaped chip cutting blade 26, which is a feature of the present invention, the blank punching blade 20 and the whiskers-shaped chip cutting blade 26 are fixed to a flat surface or a curved surface having an arcuate cross section. There is only a difference in whether it is fixed or not.

A corrugated cardboard sheet punching die 16 having a blank punching blade 20 and a whisker-shaped chip cutting blade 26 on one surface 22 is fixed to the lower rotary holder 72 on the outer peripheral surface thereof, and the upper rotary holder 70 The corrugated cardboard sheet SS is fed along the corrugated cardboard sheet feeding line in a state where the lower rotating holder 72 is rotated as shown by the arrow. As a result, when the corrugated cardboard sheet SS passes between the upper rotating holder and the lower rotating holder, the punched blank SS is punched out by the corrugated cardboard sheet punching die 16, and at that time, the whiskers are formed as in the first embodiment. The cutting tool 26 for cutting cut chips can simultaneously cut the whisker-shaped chips G derived from the core N on the cut end face, and can be separated and removed from the punched corrugated cardboard product (punched blank SS). The corrugated cardboard sheet punching die 16 may be fixed to the upper rotating holder 70.

Although the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications or changes within the scope of the present invention.

For example, in the present embodiment, when a single cardboard sheet product (punched blank SS) is punched by one punching, both the U-shaped blank punching blade 20 and the linear blank punching blade 20 are blank punched. The extension direction of the cutting tool 20 has been described as providing a plurality of whisker-shaped chip cutting cutting tools 26 on one side, but the present invention is not limited to this, and a plurality of cardboard sheet products (when punching the cardboard sheet S) When punching blank SS) at the same time, the beard-shaped chip cutting blade 26 is separated from each other in the extending direction of the blank punching blade 20 on both sides with respect to the extending direction of the blank punching blade 20. The cardboard sheet S may be divided into two by punching, but the U-shaped blank punching blade 20 is not provided on one surface 22, but only the linear blank punching blade 20 is provided. It may be provided on both sides in the extending direction, and in that case, the whiskers-shaped chip cutting blades 26 provided on each side may be provided so as to be aligned with each other in the extending direction of the punching blade 20 or provided in a staggered manner. It may be provided at random.
For example, in the present embodiment, the plurality of whisker-shaped chip cutting blades 26 provided on one surface 22 have been described as having a linear shape in which the tip portion on the opposite side to the blank punching blade 20 side is a free end. As long as it is possible to cut the whiskers-like chips G generated on the cut end face of at least one side of the cardboard product (punched blank SS), the endless shape, that is, extending from the blank punching blade 20 and curving. It may be curved to return to the blank punching blade 20, and for a plurality of whisker-shaped chip cutting blades 26, some are endd straight lines, some are endd curved lines, and some are endd curved shapes. An endless curved line may be combined.
For example, in the present embodiment, it has been described that a plurality of whisker-shaped chip cutting blades 26 are provided on one surface 22 of the corrugated cardboard sheet punching die 16, but the corrugated cardboard product (punched blank SS) is not limited thereto. As long as the whiskers G generated on the cut end face of at least one side of the corrugated cardboard can be cut, a single whiskers cutting blade 26 may be used, and only provided at the center of the length of the blank punching blade 20 in the extending direction. However, it may be provided at an arbitrary position.
For example, in the present embodiment, it has been described as punching a rectangular corrugated cardboard product (punched blank SS), but the present invention is not limited to this, and a whisker-shaped cut that occurs on the cut end face of at least one side of the corrugated cardboard product (punched blank SS). As long as the waste G can be cut, it may be a polygonal corrugated cardboard product (punched blank SS), a corrugated cardboard product having a linear side in a part of a curved shape (punched blank SS), or a corrugated cardboard product (punched blank SS). One side may be arranged diagonally.
For example, in the present embodiment, both the U-shaped blank punching blade 20U and the linear blank punching blade 20S have been described as being orthogonal to the extending direction X of the waveform of the core N of the corrugated cardboard sheet S. Not limited to this, depending on the specifications of the corrugated cardboard product to be punched, the U-shaped blank punching blade 20U and / or the linear blank punching blade 20S is set in the extending direction X of the waveform of the core N of the corrugated cardboard sheet S. On the other hand, it may be installed diagonally, and even in that case, a whiskers-shaped chip cutting blade 26 is provided on at least one side in each extension direction of the U-shaped blank punching blade 20U and the linear blank punching blade 20S. Therefore, it is possible to cut the whiskers-like chips G generated on the cut end face of at least one side of the corrugated cardboard product (punched blank SS).

For example, in the present embodiment, it has been described that a plurality of whisker-shaped chip cutting blades 26, which are the same as each other, are provided on one surface 22 of the punching die 16 for a corrugated sheet. As long as the whiskers G generated on the cut end face of at least one side of the punched blank SS) can be cut, the plurality of whiskers cutting blades 26 do not have to be the same, and the whiskers cutting blades 26 do not have to be the same. The blade length l of the blade may be different, may have a block-shaped base, or may have a thin plate-shaped blade.
For example, in the present embodiment, the plurality of whisker-shaped chip cutting blades 26 provided on one surface 22 of the cardboard sheet punching die 16 are provided in directions orthogonal to the extending direction of the blank punching blade 20. As described above, without limitation, as long as it is possible to cut the whiskers-like chips G generated on the cut end faces of at least one side of the cardboard product (punched blank SS), the orientations do not have to be orthogonal to each other, and the whiskers-like cuttings do not have to be orthogonal to each other. The orientation may be different for each of the scrap cutting blades 26.

For example, in the present embodiment, a plurality of whisker-shaped chip cutting blades 26 provided on one surface 22 of the corrugated cardboard sheet punching die 16 have been described as a so-called all-cut type, but the present invention is not limited thereto. As long as it is possible to cut the whiskers-like chips G generated on the cut end face of at least one side of the corrugated cardboard product (punched blank SS), it may be a so-called half-cut type, or both a full-cut type and a half-cut type may be included. ..
For example, in the present embodiment, the installation orientation with respect to the lower plate 13 of the corrugated cardboard sheet S has been described as positioning and adjusting with respect to one surface 22 of the corrugated cardboard sheet punching die 16, but the corrugated cardboard is not limited thereto. As long as the whiskers G generated on the cut end face of at least one side of the product (punched blank SS) can be cut, the installation direction of the corrugated cardboard sheet punching die 16 may be adjusted with respect to the corrugated cardboard sheet S.

It is the schematic of the punching system which has the corrugated cardboard sheet punching die 16 which concerns on 1st Embodiment of this invention. It is a top view which shows the corrugated cardboard sheet punching die 16, the corrugated cardboard sheet S and the punched-out blank SS which concerns on 1st Embodiment of this invention. It is a top view which shows the corrugated cardboard sheet punching die 16 which concerns on 1st Embodiment of this invention. It is a schematic plan view which shows the modification about the arrangement of the beard-shaped chip cutting blade 26 of the corrugated cardboard sheet punching die 16 which concerns on 1st Embodiment of this invention. It is a side view of the modification of the beard-shaped chip cutting blade 26 provided in the corrugated cardboard sheet punching die 16 according to the first embodiment of the present invention. It is a side view of the further modification of the beard-shaped chip cutting blade 26 provided in the corrugated cardboard sheet punch 16 according to the first embodiment of the present invention. It is a perspective view which shows the corrugated cardboard sheet punching die 16 which concerns on 1st Embodiment of this invention. It is a schematic plan view which shows the arrangement with respect to the corrugated cardboard sheet punching die 16 punched by the corrugated cardboard sheet punching die 16 which concerns on 1st Embodiment of this invention. It is the schematic of the punching system which has the corrugated cardboard sheet punching die 16 which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the shipping state of the corrugated cardboard product. It is a schematic partial perspective view which shows the crushing state at the time of punching a corrugated cardboard sheet.

G Whiskers S2 Front liner S1 Back liner NN Ruled line N Core SS Punched blank S Corrugated cardboard sheet t Punched blank thickness
h Specified height
w Blade thickness
l Blade length
d Predetermined interval Θ Punching angle with respect to the extension direction of the corrugated cardboard sheet X Extension direction of the waveform of the core N of the corrugated cardboard sheet S 10 Punching system 11 Upper plate 13 Lower plate 14 Punching device 16 Punching die for corrugated cardboard sheet 18 Outer edge 20 Blank Punching blade 22 One surface 25 Frame-shaped groove 26 Beard-shaped chip cutting blade 28 Rectangular bottom surface 30 Block-shaped base 32 Top surface 34 Blade body 32 Elongated top surface 37 Cone-shaped block-shaped base 38 Thin plate-shaped base 39 Circular Bottom surface 40 Reinforcing part 42 Elongated slit 48 Pair of long sides 50 Bottom part 52 One pair of opposite sides 54 The other pair of opposite sides 56 Pair of inner sides 58 Bottom side 70 Upper rotation holder 72 Lower rotation holder 90 End face

Claims (4)

Used to punch a punched blank from a corrugated cardboard sheet that has a corrugated core that is interposed between the front liner, the back liner, and both liners and is bonded via both liners and the top of the step. A die for corrugated cardboard sheets
A blank punching blade for punching a punched blank is provided on one surface, and the blade of the blank punching blade is positioned so that the advancing direction of the waveform of the core is orthogonal to the extending direction of the blank punching blade. Depending on the thickness of the corrugated cardboard sheet, the punched blank is projected from one surface over a first predetermined height so that the blank can be punched.
Further, in order to cut the whiskers-like chips that may be generated in the core of the cut end face of the punched blank formed by the blank punching blade, at least one side of the blank punching blade extends in the extending direction. A blade for cutting whiskers is attached,
The whiskers-shaped chip cutting blade is provided in a direction intersecting the extending direction of the blank punching blade, and the whiskers-shaped chip cutting blade has one surface depending on the thickness of the corrugated cardboard sheet. Protruding from the second predetermined height,
A die for corrugated cardboard sheets, which is characterized by this. The blank punching blade has a wavy shape in which the edge portion of the blade edge has peaks and valleys in the vertical direction.
Further, when punching a punching blank, a urethane blade receiving plate having a thickness capable of biting into the valley portion of the blank punching blade is provided so as to face the corrugated cardboard sheet punching die.
The corrugated cardboard sheet punching die according to claim 1, wherein the level of the cutting edge portion of the whisker-shaped chip cutting blade is provided between the valley portion and the mountain portion of the blank punching blade. The corrugated cardboard sheet punching die according to claim 1 or 2, wherein the blank punching blade and the whiskers-shaped chip cutting blade are integrally formed as a plan-view L-shaped blade. A front surface liner provided with a blank punching blade for punching a punched blank and a whisker-shaped chip cutting blade provided in a direction intersecting the extending direction of the blank punching blade on one surface. , The stage of preparing a die for a corrugated cardboard sheet having a corrugated core that is interposed between the back liner and both liners and is bonded via both liners and the top of the step.
A step of positioning the corrugated cardboard sheet so that the advancing direction of the waveform of the core is orthogonal to the extending direction of the blank punching blade.
By pressing the blank punching blade for corrugated cardboard sheet and the whisker-shaped chip cutting blade against the corrugated cardboard sheet, the punched blank is punched from the corrugated cardboard sheet, and at the time of punching, the cut end face by the blank punching blade is used. A punching method for corrugated cardboard sheets, which comprises a step of cutting the generated whiskers-like chips and separating them from the punched blank.

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