How to create a balance correction sheet for a die-cutting machine

Abstract

To provide a method for creating a balance correction sheet that can easily eliminate unevenness in pressing force inherent to individual punching machines. [Solution] A balance correction die D equipped with a number of regularly-arranged punching blades is attached to a punching machine, a test paperboard T is placed on a cutting plate 21, and a peelable laminated sheet F having approximately the same outer peripheral shape as the test paperboard T is placed on the back surface of the balance correction die or cutting plate. The steps of slightly increasing the pressing force of the punching machine until a punched-out area is created on the test paperboard T, and peeling off the areas of the laminated sheet corresponding to the punched-out areas of the test paperboard T, one sheet at a time, with the same pressing force, until no areas of the test paperboard T are punched out with the same pressing force, are repeated until all of the punching blades have punched out the test paperboard T at once.

Description

[Technical field]

[0001] The present invention relates to a method for creating a balance correction sheet for a punching machine used for punching paper or resin boards or resin films to obtain the outer shape of paper containers, cardboard boxes, etc. [Background technology]

[0002] Paper containers and cardboard, also known as packaging containers or paper boxes, are made by punching, folding and gluing together paper, cardboard, coated paper, resin, and other materials, including multiple papers and composite materials made of paper, resin and metal. Paper containers are lightweight and easy to carry, and are widely used in many industrial fields.

[0003] In known punching machines, the punching die used for punching paper is manufactured by laser processing a plywood board according to the outer shape and folding lines of the paper container to form through grooves for the punching blade and the crease member that correspond to the outer shape of the paper container, and then embedding the punching blade and the crease member in each through groove. The height dimension of the creasing member is set smaller than that of the punching blade, and the downward projection amount of the creasing member is smaller than that of the punching blade. When punching the paper along the outline of the paper container and adding creases, the rubber material attached to the punching die is used. While holding the paper so that it does not move, the paper is cut and creased. The face plate, also called a counter plate, is made of metal or synthetic resin such as ABS, PBT, PPS, or phenolic resin, and consists of a plate, sheet, or film-shaped substrate, which is produced by cutting grooves into positions corresponding to the crease parts of the die using an NC processing machine based on CAD data for producing the die, and then cutting out the part that the die blade will come into contact with to form the outer periphery (see Figure 1). It may also be pressed directly against a flat cutting plate that does not have grooves.

[0004] In Fig. 1, the punching die is attached to the upper platen of the punching machine, and the face plate is attached to a cutting plate to receive the paper. The cutting plate is attached to the lower platen of the punching machine by being attached to a chase (frame) (not shown), and receives the cutting edge of the punching blade arranged on the punching die. Then, the paper is inserted between the cutting edge of the punching die attached to the upper platen of the punching machine and the face plate on the cutting plate attached to the lower platen of the punching machine, and the lower platen is raised and then lowered to perform the punching process. That is, the paper is cut into a desired shape with a punching blade, and multiple creases are made in the required areas with a creasing member and grooves in the face plate to form a blank (punched paper).The blank is then folded along the creases and the glue tabs are glued together to assemble the paper container. In addition to the above, there is also a configuration (not shown) in which a notch blade provided on a punching die is used to punch out paper with perforations formed to form a zipper, and also to provide folds and perforations. In FIG. 1, the punch die is on top and the cutting plate is on the bottom. However, it is also possible to envision an arrangement in which the cutting plate is on top and the punch die is on the bottom.

[0005] In the above punching process, one blank (punched paper) may be formed in one operation, but in order to increase productivity, it is preferable to form multiple blanks at the same time; for example, four blanks are formed simultaneously in one operation.

[0006] In particular, in order to uniformly punch each of the plurality of blanks, it is necessary to set the pressing force of the punching die so that it is applied evenly to the sheets of paper. However, the pressing force of the punching die becomes uneven due to maintenance problems, aging, etc. Therefore, in order to punch each of the blanks uniformly, various efforts have been made to reduce the unevenness of the pressing force of the punching die.

[0007] In particular, in Patent Document 1, the inventors of the present application disclosed a balance correction sheet made of a laminated sheet on which peelable sheets are laminated, with the objective of correcting the overall pressure balance before attaching a punching die to a punching machine in which the overall balance of pressing forces has been disrupted due to distortion or wear in the drive parts or drive connection parts of the punching machine, resulting in areas with weak punching pressure and areas with strong punching pressure. The balance correction sheet is configured such that the cuts are shallow in areas where the punching pressure in the punching machine is weak and the cuts are deep in areas where the punching pressure is strong, and the sheet is partially cut out according to the depth of the cuts. That is, the thickness of the balance correction sheet is large in the area where the punching pressure of the punching machine is weak, and is small in the area where the punching pressure of the punching machine is strong. With this configuration, a new technology has been presented that increases the pressure of the area where the punching pressure of the punching machine is weak and decreases the pressure of the area where the punching pressure of the punching machine is strong. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 5197870 Summary of the Invention [Problem to be solved by the invention]

[0009] However, the above-mentioned balance correction sheet requires complicated work of cutting the stacked sheets in half and varying the number of sheets to be partially removed depending on the strength of the punching pressure, which has made its introduction difficult. SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a method for easily creating a balance correction sheet for eliminating uneven pressing force generated in a punching machine. [Means for solving the problem]

[0010] The method for producing a balance correction sheet for a punching machine of the present invention is a method for producing a balance correction sheet for eliminating unevenness in pressing force inherent to an individual punching machine in which a punching die and a cutting plate that receives the cutting edge of a punching blade provided on the punching die are arranged opposite each other and for applying a uniform pressing force by punching paper. The method comprises the steps of: attaching a balance correction die having a plurality of punching blades arranged with a regularity to the punching machine; arranging a test paperboard for grasping unevenness in pressing force on the cutting plate; and attaching a peelable laminated sheet having substantially the same outer peripheral shape as the test paperboard to the balance correction die or the back of the cutting plate. the step of placing a laminated sheet on a surface of the die and slightly increasing the pressing force of the punching machine until a partially punched-out portion is formed in the test cardboard; the step of peeling off areas of the laminated sheet corresponding to the partially punched-out portions of the test cardboard one by one until no more portions of the test cardboard are punched out with the same pressing force, and placing a new test cardboard on the cutting plate each time a sheet of the laminated sheet is peeled off, is repeated until all the punching blades of the balance correction die have punched out the test cardboard at once, thereby obtaining a balance correction sheet which is a laminated sheet with a different thickness corresponding to the unevenness in the pressing force of the punching machine.

[0011] The method for creating a balance correction sheet for a punching machine of the present invention is characterized in that, when a laminated sheet is placed on the upper platen side of the punching machine, the laminated sheet is sandwiched between a protective plate placed on the back plate of the chase to which the balance correction mold is fixed and a cover sheet which is a resin film or a thin metal plate. According to the present invention, the laminated sheet F is prevented from shifting or being damaged, and the cover sheet arranged to cover the laminated sheet is easily removable, making it possible to smoothly carry out maintenance when balance correction becomes necessary due to the passage of time in the punching machine.

[0012] In addition, in order to peel off the area of ​​the laminate sheet corresponding to the punched-out portion of the test cardboard without forgetting, the outer periphery of the area of ​​the laminate sheet corresponding to the punched-out portion of the test cardboard is marked, and an identifier is assigned to distinguish the area of ​​the laminate sheet corresponding to the punched-out portion of the test cardboard from the other portions, and each sheet that makes up the laminate sheet may be assigned a distinguishable identifier such as coloring.

[0013] Furthermore, the method for creating a balance correction sheet of the present invention is characterized in that, when unevenness in the pressing force occurs over time or the like in a punching machine in which a balance correction sheet created as described above is placed, any number of sheets that constitute a laminated sheet are releasably superimposed on the balance correction sheet placed in the punching machine to obtain a laminated sheet in a state that reflects the unevenness in the pressing force of the punching machine prior to the punching. Effect of the Invention

[0014] According to the present invention, unlike the methods of creating a balance correction sheet disclosed in the prior art, the top surface of the laminated sheet is used as the reference, so there is no need to cut out the laminated sheet according to the depth of the cut. By repeating the simple task of peeling off a piece of the laminated sheet that corresponds to the punched location on the test paperboard, it is possible to create a balance correction sheet in a short time to eliminate unevenness in the pressing force that occurs in the punching machine. In addition, by assigning an identifier to the laminated sheet that distinguishes the peeled area from the rest, and by assigning a distinguishable identifier to each layer of the laminated sheet, it is possible to prevent forgetting to peel the sheet and to visually grasp unevenness in the pressure. Furthermore, by creating a balance correction sheet from a laminated sheet in which peelable sheets are layered as in the present invention, if it is assumed that a punching machine in which a balance correction sheet is arranged has been used for a certain period of time and unevenness in the pressing force has occurred due to aging or the like, it is easy to overlay (add) a new laminated sheet on the balance correction sheet that is being used, and a laminated sheet that reflects the previous pressing force of the punching machine can be obtained.Therefore, it is possible to shorten the process and time required to create the balance correction sheet compared to creating a new balance correction sheet from a laminated sheet at the time of maintenance. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a diagram showing a typical punching machine including the present embodiment. [Diagram 2] FIG. 2 is a diagram showing a laminated sheet according to the present embodiment. [Diagram 3] FIG. 2 is a diagram showing a balance correction mold according to the present embodiment. [Figure 4] 1 is a schematic diagram showing a configuration of a punching machine when preparing to create a balance correction sheet according to the present embodiment; FIG. [Diagram 5] 1 is a schematic diagram showing a punching machine when preparation for creating a balance correction sheet according to the present embodiment is complete; FIG. [Figure 6] FIG. 11 is a diagram showing a part of the balance correction sheet creation step of the present embodiment. [Figure 7] FIG. 2 is a diagram showing a test paperboard according to the present embodiment. [Figure 8] FIG. 2 is a diagram showing a test paperboard according to the present embodiment. [Figure 9(a)] 13 is a diagram showing the correspondence between the laminated sheet and the test paperboard in the balance correction sheet creation step of this embodiment. FIG. [Figure 9(b)] 13A and 13B are diagrams showing laminated sheets in a balance correction sheet creation step of the present embodiment. [Figure 10] 13A and 13B are diagrams showing laminated sheets in a balance correction sheet creation step of the present embodiment. [Figure 11]11 is an image showing the steps of creating a balance correction sheet according to the present embodiment. [Figure 12] 13 is an image showing the state of a test paperboard when the creation of a balance correction sheet according to the present embodiment is completed. [Figure 13] FIG. 13 is a diagram showing a balance correction mold having a different form from the above embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, specific embodiments for carrying out the present invention will be described with reference to the drawings. (About the punching machine) FIG. 1 is a schematic diagram showing a known punching machine 1 into which the balance correction sheet S in this embodiment is introduced, and is a cross-sectional view showing a schematic relationship between a punching die 11, paper P (which is punched out to become a paper container), and a cutting plate 21.

[0017] The punch die 11 is produced by laser processing or router processing a plywood according to the outer shape of the blank and the folding lines to form through grooves for the punch blade 101 and the crease member 102 corresponding to the outer shape of the blank, and then embedding the punch blade 101 and the crease member 102 in the respective through grooves. In this embodiment, the punching die 11 is attached to the upper platen 10 side of the punching machine 1 by being attached to a chase (frame), but the manner in which it is attached can be selected appropriately. The height dimension of the creased member 102 is set smaller than that of the punching blade 101, and the amount by which the creased member 102 protrudes downward is smaller than that of the punching blade 101. When the paper P is punched out along the outline of the blank and creases are formed, the paper P is held down by a rubber member 103 disposed on the punch die 11 to prevent it from moving while cutting and forming creases.

[0018] A cutting plate 21 that receives the punching blade 101 during punching is disposed in a position facing the punching die 11. The cutting plate 21 is also attached to a chase (frame) in the same manner as the punching die, and is attached to a lower surface plate 20 of the punching machine 1. The face slab 22 (counter plate) attached to the cutting plate 21 is made of a synthetic resin such as ABS, PBT, PPS, or phenolic resin, and consists of a plate-, sheet-, or film-shaped substrate. It is manufactured by cutting grooves at positions corresponding to the creasing members 102 of the punching die 11 using an NC processing machine based on CAD data for producing the punching die 11, and then cutting out the portion that will come into contact with the punching blade 101 to form the outer periphery.

[0019] Then, the paper P is inserted between the punching die 11 of the punching machine 1 configured as above and the face plate 22 attached to the cutting plate 21, and the lower surface plate 20 is raised and then lowered to perform the punching process.

[0020] (How to prepare a balance correction sheet) In the punching process as described above, in order to uniformize the unevenness of the force (pressing force) used to punch the paper, which inevitably occurs, the balance correction sheet S of the present invention in this embodiment is placed on the upper platen side of the punching die 11 (position X in Figure 1). A method for creating the balance correction sheet S of the present invention will be described below.

[0021] To produce the balance correction sheet S of the present invention, a laminated sheet F and a punch die for producing the balance correction sheet (balance correction die D) are required. FIG. 2 is a schematic diagram of a laminated sheet F in this embodiment, and FIG. 3 is a diagram of a balance correction mold D in this embodiment.

[0022] (About laminated sheets) The laminated sheet F has a rectangular shape in which a plurality of peelable sheets Fa shown in FIG. 2(b) are laminated. The laminate sheet F is made of paper, resin, metal, composite materials thereof, etc., and is peelably attached and laminated. More specifically, various thin plates of paper, polyphenylene sulfide (PPS), polypropylene (PP), polyethylene, polystyrene, polyvinyl chloride, polyethylene terephthalate (PET), polyimide, acetate, acrylic, epoxy, aluminum, iron, stainless steel, etc., and composite materials thereof, etc., are applicable. The peelable laminated sheet F may be, for example, a sheet having an adhesive layer formed on at least one side thereof. As the adhesive, known adhesives such as rubber-based and acrylic-based adhesives may be used. For example, the sheet may be made of a material that has an adhesive property due to its surface shape, or may be made of a material that is adhesive due to static electricity. The thickness of the sheet Fa is set to 10 μm or more and 100 μm or less, and the number of layers is set to 5 or more and 25 or less. For example, you can start with a 5- or 10-ply laminated sheet, and then when you need to perform balance adjustments again a few years later, you can simply add another 5 or 10 layers on top, making continuous, permanent maintenance possible.

[0023] (About the balance correction mold) The balance correction mold D consists of a substrate Da and punching blades Db (Db1, Db2) (Fig. 3). The substrate Da is made of a thick rectangular plywood or resin block, and through-grooves are formed by laser processing the plywood along lines drawn vertically and horizontally at regular intervals, and punching blades Db1 (horizontal blade) and Db2 (vertical blade) are embedded in each groove. Figure 3(a) is a view from the punching blade side (front side) of the balance correction mold D, in which multiple band-shaped horizontal blades Db1 are embedded in parallel into the substrate Da, and multiple vertical blades Db2 are embedded at predetermined intervals in a direction crossing between these horizontal blades Db1, and the horizontal blades Db1 and vertical blades Db2 are formed so as to intersect at right angles in a lattice pattern. Here, it is preferable that the area of ​​the substrate Da is set to be approximately the same as the area of ​​the laminated sheet F or slightly larger than the area of ​​the laminated sheet F. FIG. 3(b) is a left side view of the balance correction die when the side from which the punching blade protrudes is the front.

[0024] (Preparation for creating a balance correction template) FIG. 4 is an oblique view showing a schematic configuration of a punching machine for creating the balance correction sheet S, and FIG. 5 shows a schematic diagram of the state in which preparation for creating the balance correction sheet has been completed according to the following procedure. (1) First, the balance correction die D is disposed on the upper platen side via a chase so that the punching blade Db protrudes on the lower platen side. (2) Next, on the side (back side) of the balance correction die D where the punching blade Db does not protrude, there is a chase back plate W that fixes the balance correction die D, and on its upper surface is placed a laminated sheet F with a protective plate B interposed therebetween. In this embodiment, a cover sheet A made of a resin sheet or a thin metal plate is placed on the laminated sheet F. The laminate sheet F is sandwiched between the protective plate B and the cover sheet A in order to prevent the laminate sheet from shifting or being damaged, and to prevent the adhesive used to secure the laminate sheet from adhering to the chase back plate W or upper surface plate 10. In addition, the cover sheet A arranged to cover the laminated sheet F is easy to remove, which has the effect of making it possible to smoothly carry out maintenance when balance correction becomes necessary due to changes in the punching machine 1 over time. (3) On the other hand, the cutting plate 21 is attached to the lower surface plate 20 via a chase or the like. (4) A sheet (blade protection sheet C) for protecting the punching blade Db of the balance correction die D is attached onto the cutting plate 21. (5) A test paperboard T having a thickness of about 0.2 mm and a peripheral shape (area) substantially identical to that of the laminated sheet F is placed on the blade protection sheet C in order to grasp unevenness in the pressing force of the punching machine. Here, in this embodiment, the protective plate B is placed on the laminated sheet F, but there are no limitations on the form, and it can be appropriately selected in consideration of work efficiency and the like. In addition, in this embodiment, the blade protection sheet C for protecting the tip of the punching blade Db of the balance correction mold D is a film made of PET (polyethylene terephthalate) resin with a thickness of approximately 0.2 mm, but the specifications such as its thickness and material are not particularly limited as long as they contribute to protecting the tip of the blade.

[0025] (Steps for creating a balance correction sheet) As shown in Figure 5, with the die-cutter ready to create a balance correction sheet, proceed with the following steps:

[0026] (Step 1) After preparation for making the balance correction mold sheet is completed, the punching machine 1 is operated so that the punching blade Db arranged on the balance correction mold D approaches and contacts the test paperboard T (see FIG. 6). (Step 2) From this point, the pressing force of the punching machine 1 is gradually increased (boosted) until the test paperboard T is half-cut (the punching blade is inserted into about half the thickness of the paper). Figure 7 is a plan view of the test paperboard T, showing the part indicated by the dashed line half-cut by the punching blade Db. (Step 3) Further, while checking whether any punched-out areas have been formed on the test paperboard T, the pressing force of the punching machine 1 is increased slightly. When a punched-out area has been formed on the test paperboard T, the application of the pressing force is stopped and the pressing force is recorded. FIG. 8 is a plan view of the test paperboard T, and shows that the portion represented by the solid line in the upper right corner of the drawing is the punched portion, which coexists with the non-punched portion represented by the dashed line. (Step 4) Then, the test paperboard T is placed on top of the laminated sheet F placed on the back side of the balance correction mold D so that the edges are aligned (see Figure 9(a)), and markings are made around the parts of the laminated sheet F that correspond to the punched-out areas of the test paperboard T (see Figure 9(b)). As described above, it can be seen that the marked area M of the laminated sheet F (uppermost sheet Fa) is a portion to which a stronger pressing force is applied than other portions. (Step 5) Trace and cut the outer periphery of the marked area M of the laminated sheet F with a cutter, and peel off one of the sheets Fa that constitute the laminated sheet F. Here, in order to prevent forgetting to peel off the marked area M of the laminated sheet F, it is preferable to add an identifier at the same time as marking, for example by drawing a diagonal line in the marked area M, as shown in Fig. 10. The identifier can be appropriately selected from colors, patterns, lines, numbers, letters, etc. Furthermore, each sheet Fa constituting the laminated sheet F may be given an identifier by being colored a different color. FIG. 11 is an image showing the actual peeling off of the marked area M of the laminated sheet F.

[0027] (Step 6) With the marked area M peeled off from the laminated sheet F as described above, a new test paperboard T is placed on the cutting plate 21 (on the blade protection sheet C) and a pressure force equal to the pressure that caused the punched area on the previous test paperboard T is applied to check for the presence or absence of the punched area.

[0028] (Step 7A) If there are any punched areas as a result of step 6, steps 4 to 6 are repeated until there are no more punched areas, and then proceed to step 7B described below.

[0029] (Step 7B) If there are no punched portions as a result of step 6, the pressing force is increased slightly (boosted). In this embodiment, a pressing force is applied such that the punching blade Db of the balance correction die D is inserted into the test board T 0.03 mm to 0.05 mm deeper than the previous pressing force.

[0030] (Step 8) If the result of step 7B shows that there are any punched areas, the pressing force is recorded, and as in steps 4 and 5, the area of ​​the laminated sheet F corresponding to the punched area of ​​the test paperboard T is marked, and one piece of the marked area M of the laminated sheet F is peeled off. A new test paperboard T is placed on the cutting plate 21 (on the blade protection sheet C) and the same pressing force as that which caused the punched area of ​​the previous test paperboard T is applied to confirm whether or not there are any punched areas. (Step 9A) If there are any punched areas as a result of step 8, repeat step 8 until there are no more punched areas, and then proceed to step 9B described below. (Step 9B) If there are no punched portions as a result of step 8, the pressing force is increased slightly. Again, in this embodiment, a pressing force is applied such that the punching blade Db of the balance correction die D is inserted into the test board T 0.03 mm to 0.05 mm deeper than the previous pressing force.

[0031] As described above, steps 7A to 9B are repeated several times, and the pressing force of the punching machine 1 is increased by interposing a laminated sheet F of different thicknesses in accordance with the unevenness of the pressing force specific to the punching machine. Eventually, the test paperboard T is completely punched out by the punching blade Db (see Figure 12). The laminated sheet F in this state is a balance correction sheet S that corresponds to the punching machine 1, and the punching machine 1 is one in which the pressing force applied thereto is uniform.

[0032] (Other embodiments) In the above embodiment, the balance correction mold D has the punching blades Db arranged in a lattice pattern, but this is not limited to a lattice pattern, and other shapes may be used as long as they are arranged in such a way that the punched and non-punched areas can be distinguished as shown in FIG. 13, and can be selected as appropriate.

[0033] 13(b), the punching blades Db are arranged to form multiple triangles, but a gap Y is provided at a portion of the intersection (contact) between the blades so that perfect triangles cannot be punched out. This has the effect of making the test paperboard T not fall apart and making the work smoother in the step of aligning it with the laminated sheet F and marking the laminated sheet F so as to surround the position corresponding to the punched out portion by making cuts in the test paperboard T with the punching blades but not dividing it, and thus making the work smoother. In FIG. 13(b), the gap Y is provided at some of the intersections between the blades of the punching blade Db, but the gap Y may be provided so that all the blades do not intersect (contact).

[0034] In addition, in this embodiment, the balance correction mold D is arranged on the upper surface plate 10 side and the cutting plate 21 is arranged on the lower surface plate 20 side. However, the cutting plate may be arranged on the upper surface plate side and the balance correction mold D on the lower surface plate side, in which case the laminated sheet is arranged on the back side of the cutting plate. [Industrial Applicability]

[0035] With the invention disclosed in this manner, by simply preparing the balance correction mold D, laminated sheet F, and test paperboard T, a balance correction sheet S can be smoothly produced by repeating simple tasks, even without special skills, and it is possible to adjust the punching machine 1 to have a uniform pressing force without unevenness. [Explanation of symbols]

[0036] 1 cutting machine, 10 Upper surface plate, 11 punching die, 101 Punching blade, 102 Ruler members, 103 Rubber members, 20 Lower surface plate, 21 Cutting plate, 22-sided plate (counter plate), A (laminated sheet) cover sheet, B protection plate, C Blade protection sheet, D Balance correction type, Da substrate, Db (balance correction die) punching blade, Db1 (balance correction type) vertical blade, Db2 (balance correction type) side blade, F laminated sheet, Fa: Sheets constituting the laminated sheet; M: Area of ​​the laminate sheet corresponding to the punched area of ​​the test board; P paper, S balance correction sheet, T Test board, Back plate of W chase (frame), Y: The gap between the intersections of the punching blades of the balance correction die

Claims

1. A method for creating a balance correction sheet for eliminating uneven pressing force inherent to an individual punching machine that punches paper to form blanks, the punching machine having a punching die and a cutting plate that receives the cutting edge of a punching blade provided on the punching die, and for applying a uniform pressing force, comprising: A balance correction die consisting of a plurality of punching blades arranged in a regular pattern is attached to the punching machine, a test paperboard for grasping unevenness in pressing force is arranged on the cutting plate, and a peelable laminated sheet having substantially the same outer peripheral shape as the test paperboard is arranged on the back surface of the balance correction die or the cutting plate; Slightly increasing the pressure of the die cutter until the test board is partially die cut; Peeling off the laminated sheet one by one in areas corresponding to the partially punched out portions of the test board with the same pressure until there are no more punched out portions of the test board, and placing a new test board on the cutting plate after each peeling off of the laminated sheet. This method for creating a balance correction sheet is characterized by repeating the process until all of the punching blades of the balance correction mold have punched a test paperboard at once, thereby obtaining a balance correction sheet that is a laminated sheet having a different thickness corresponding to the unevenness of the pressing force of the punching machine.

2. A method for creating a balance correction sheet as described in claim 1, characterized in that a laminated sheet which is peelably laminated with approximately the same outer peripheral shape as the test cardboard is placed on a protective plate arranged on the back plate of a chase to which a balance correction mold is fixed, and is sandwiched between a cover sheet which is a resin film or a thin metal plate.

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