JP3820929B2 - Sheet manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet manufacturing method that is suitably used for manufacturing business cards and the like.
[0002]
[Prior art]
Some sheets such as paper need to be cut and used. For example, business cards with a small number of copies are increasingly created on a personal computer. After creating a business card template on a personal computer, paper settings are made and multiple locations on one sheet with a printer such as a printer. It has become possible to print multiple business cards.
[0003]
At that time, in order to facilitate cutting and printing on the back side, a sheet is provided with a base material for printing and a back-up base material attached to one side of the base material for printing in a peelable manner. And forming a notch for cutting out a predetermined area along a line that divides a business card in a part of the printing base material, and the backup base material is located inside the predetermined area of the printing base material. There has been considered a structure in which an opening for opening a printing area is formed, and the notch of the printing substrate is backed up by the periphery of the opening.
[0004]
Thus, it is possible to print also on the print area exposed in the opening portion, and hold the predetermined area as each business card so that it cannot be dropped off by the back-up base material. The area can be easily cut out.
[0005]
[Problems to be solved by the invention]
By the way, in order to produce such a sheet, the opening for exposing the printing area on one side of the printing substrate is peeled off from the peeling piece located at the corresponding portion of the backing substrate. Need to be formed. At that time, if the opening is completely closed, the peeling pieces become independent, so that it is necessary to peel the peeling pieces individually, and the manufacturing process becomes extremely complicated. In order not to have such a problem, the peeling pieces are connected to each other by a connecting piece, and in the case of peeling, in a state of being connected to each other via the connecting piece peeled from between adjacent openings. It is desirable to peel it integrally in the connecting direction so that it can be wound.
[0006]
However, for example, if the width dimension of the connecting piece (the dimension in the direction orthogonal to the connecting direction) is simply set to the same value as the same dimension of the opening, the peeling piece is wound together with the connecting piece in the form of a band, While it is convenient for winding, most of the backup base material in the part that backed up the cut in the direction orthogonal to the connecting direction is peeled off, so that a predetermined area extracted as a business card in this part is on the periphery of the opening. It is in a state where it is not temporarily held. For this reason, when this sheet is used in such a manner that it passes through the printer along the connecting direction, the two-layer part in which the printing base material and the backup base material are polymerized forms a belt-like shape in the transport direction and serves as the backup base material. It is fed out by the conveying roller in parallel through the one-layer portion where only the printing base material remains without being backed up. At this time, although the position of the transport roller differs depending on the type of printer, not all the two-layer portions forming the belt shape are transported by the transport roller, only the intermittent position is supported. A certain part is forced to follow the conveying force transmitted from the periphery. However, if the width of the one-layer portion located between the two-layer portion and the two-layer portion in the direction orthogonal to the conveyance direction is large, the conveyance force is not transmitted well due to the vulnerability of the one-layer portion, and a delay occurs. A sheet portion was generated, and this portion was caught, causing a large paper jam. Therefore, in practice, the sheet cannot be passed through the printer in such a direction, and the insertion direction is limited to the direction orthogonal to the connection direction.
[0007]
On the other hand, there is also a problem in using the sheet in such a manner that the sheet is passed through a printer along a direction orthogonal to the connecting direction. In this case, for example, considering a normal case in which the paper feed roller of the printer is positioned at both left and right edges in the sheet conveying direction, the roller includes a two-layer portion in which a printing substrate and a backup substrate are superposed. Then, the connecting piece, which is a part of the backup base material, is peeled off, and alternately passes through the one-layer portion where only the printing base material remains. For this reason, the conveyance force input to the peripheral area located outside the printing area across the notch of the printing substrate when passing through the one-layer portion is not transmitted to the printing area, and peeling occurs between the two. Problems such as paper jams occur frequently. Also, the homogeneity of the paper quality and the smoothness of the sheet have a significant effect on the roller transport function. However, if the roller alternately passes through the first and second layer portions as described above, the frictional force and contact of the roller This can cause a variation in force, resulting in further promotion of paper jams.
[0008]
The above inconveniences are often seen particularly in the case of continuous feeding. During continuous feeding, the sheets are stacked and set in the sheet feeding cassette. However, as the stacking increases, the bulk difference between the first layer portion and the second layer portion can be increased. For this reason, the upper sheet to be fed is in a warped state that is likely to cause a paper jam from the beginning, which is a cause of frequent paper jams.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the sheet manufacturing method according to the present invention has a rectangular shape in which the length of the vertical edge is larger than the length of the horizontal edge, and a predetermined region is cut out in part. A first base material having a notch for cutting and a rectangular shape in which the length of the longitudinal edge is larger than the length of the lateral edge, and is attached to one side of the first base material in a peelable manner. A sheet comprising the second substrate is stretched in a direction corresponding to the longitudinal edge of the sheet in a direction corresponding to the lateral direction of the sheet with a width dimension equal to the length of the longitudinal edge of the sheet. The first base material and the second base material each having a shape are bonded to each other , and are manufactured by sequentially cutting a portion that should become a sheet in a lateral direction, and the cutting From before, the first base material and the second base material bonded together A peeling piece that is part of the second base material and is cut and raised to form an opening in the second base material, and a groove that is part of the second base material and is cut and raised to form the groove in the second base material In the state where the connecting pieces to be formed are connected to each other, and the connecting pieces of sheets adjacent to each other across the position to be cut are connected to each other, the peeling piece and the connecting piece are continuously connected to the first base member. The second base material is formed by peeling the release piece, and the inner side of the predetermined region on one side of the first base material is made to peel off from the predetermined region. The left end of the opening at the left end is opened to the left side through a groove formed by peeling the connecting piece between the left longitudinal edge and the right end. Through the groove formed by peeling the connecting piece between the right side of the opening and the vertical edge on the right side. The openings adjacent to each other in the lateral direction communicate with each other via a groove formed by peeling off the connecting piece at a portion between the openings, and the groove is narrower than the opening. In addition, the grooves formed in the width direction both edges of the groove are slanted lines having an angle with respect to both the vertical direction and the horizontal direction, and between the opening and the vertical edge. , And having a shape that becomes narrower toward the edge in the vertical direction.
[0010]
Thus, by providing the opening and the groove in the second substrate, although the width dimension is narrow, since the communication between mutually adjacent openings by the groove, the second The peeling piece located inside the opening in the base material can be peeled at once while being integrally wound together with the connecting piece located inside the groove in the second base material , thereby simplifying the manufacturing process. Can do.
Further, conventionally, the peeling piece is peeled off along the long side direction of the sheet, but in this embodiment, the peeling piece is peeled off along the short side direction of the sheet. Can be prevented from getting fattened at an early stage, and a situation in which the peeling direction is deviated to cause a winding failure can be prevented.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>
The sheet S shown in FIG. 1 is configured by bonding a printing substrate 1 as a first substrate and a backup substrate 2 as a second substrate as shown in FIG. Reference numeral 1 denotes a state in which the product after cutting into a predetermined size (for example, A4 size) is viewed from the back-up base material side. The sheets S before cutting are in a state of being continuous along the arrow X direction. One aspect of usage is that after creating a business card template on a personal computer, paper settings are made, the sheet S is passed through a printer such as a printer, and a plurality of business cards are printed at a plurality of locations on one sheet. If necessary, it can be cut out and used. In FIG. 1, a portion not shaded indicates a portion where the backup base material 2 is peeled off, and a shaded portion indicates a portion where the backup base material 2 remains.
[0018]
More specifically, the printing substrate 1 is a plate-like material made of an appropriate material such that both sides are printable surfaces, and a rectangular predetermined region 11 to be a business card in a part of the plate-like material. Cuts 12a and 12b are formed vertically and horizontally. The depths of the cuts 12a and 12b completely cut the thickness direction of the printing substrate 1. Specifically, these cuts 12a and 12b are set so that eight business cards can be cut from each position of two rows and four rows of one sheet S in a state of being cut to A4 size. Certain peripheral regions 13a, 13b, 13c, and 13d that are margins are secured between the region 11 and the top, bottom, left, and right edges s1 and s2 of the sheet S and between the top and bottom, left and right of the predetermined region 11.
[0019]
On the other hand, the backup base material 2 is made of paper, and on the back side located on one side of the printing base material 1, an area located slightly inside the predetermined area 11 in the printing base material 1. An opening 21 to be opened is formed. The opening 21 is used to expose a certain range of the back surface of the printing substrate 1 so that the back surface of the business card can be printed. The opening 21 has a substantially rectangular shape. While the sheet S is parallel to the lateral edge s1 of the sheet S, the longitudinal opening edge 21b is obliquely opened toward the center so as to form a square shape with respect to the longitudinal edge s2 of the sheet S. There is a line. The vertical opening edge 21b and the horizontal opening edge 21a are smoothly continuous so as not to form a corner in the middle. The peripheral edge of the opening 21 backs up a part of the horizontal cut 12a and the vertical cut 12b of the printing substrate 1, so that the predetermined area 11 serving as a business card is not accidentally cut off or dropped off. I am doing so.
[0020]
Then, both sides of the opening 21 are opened laterally through a groove 31 formed between the longitudinal edge s2 of the A4 size sheet S, and the opening 21 in the left row and the opening 21 in the right row Are communicated with each other through a groove 32 formed in the portion. The connecting pieces 41 and 42 cut and raised from the grooves 31 and 32 are connected to each other between the peeling pieces 43 cut and raised from the opening 21, and the peeling pieces 43 are continuously peeled off in the connecting direction. It is possible to take. In the drawing, a sheet cut to A4 size is shown, but before cutting, the portion to be A4 size is continuous in the horizontal direction in the drawing (the connecting direction by the connecting piece 41), and the peeling piece 43 is connected to the connecting piece 41, 42 is peeled off all over these areas.
[0021]
In this case, in the present embodiment, the connecting pieces 41 and 42 are set so that the width dimension Z orthogonal to the connecting direction is narrow, and the connecting base material 1 is cut and raised after the connecting pieces 41 and 42 are cut and raised. The back-up base material 2 remaining on the back side of the base plate is kept substantially backed up by a width direction cut (that is, a cut in the vertical direction) 12b orthogonal to the connecting direction of the printing base material 1. Specifically, in the sheet region that should be A4 size, the shape of the connecting piece 41 formed by the cuts 31a is from the left edge s2 of the sheet S toward the right side (that is, the connecting direction) in the connecting direction ( X direction) and the widthwise direction (Y direction) orthogonal to the connecting direction, and gradually extending along the diagonal line that is angled to the longitudinal cut 12b of the printing substrate 1, After exceeding the notch 12b, it curves sharply and continues smoothly to the opening edge 21b in the vertical direction. The right edge s2 of the sheet has a symmetrical structure. Of course, such an A4 size region is continuous in the left-right direction before cutting, and therefore, the left peeling piece 43 is connected to the right side of the illustrated right peeling piece 43.
[0022]
In addition, the connecting piece 42 that is located in the middle of the A4 size and connects the left and right peeling pieces 43 is gradually narrowed while gradually bending from a position continuous with the longitudinal opening edge 21b of the left opening 21. After that, while gradually bending symmetrically, the width gradually becomes wider and is continuous with the longitudinal opening edge 21b of the right opening 21, that is, the cut 32a is formed in a substantially semicircular shape. It has been done.
[0023]
The back-up base 2 is detachably bonded to the printing base 1, and for that purpose, an appropriate adhesive (for example, as shown in FIG. An adhesive layer 5 is formed by applying or spraying an acrylic synthetic glue), and a protective layer 6 that partially conceals the adhesive layer 5 by silk printing is formed on the adhesive layer 5. The protective layer 6 has a dot shape, for example, and the dot density is changed depending on the position. Specifically, the density of the protective layer 6 corresponding to the vicinity of the notches 12a and 12b forming the predetermined region 11 is set low, and the density of the protective layer 6 corresponding to other portions (such as in the predetermined region 11) is set high. It is what. In particular, since the connecting pieces 41 and 42 are narrow, the portions of the grooves 31 and 32 are completely covered with the protective layer 6 so that the adhesive force does not reach so that they can be easily peeled off. Is also effective.
[0024]
Hereinafter, the manufacturing process of this sheet | seat S is demonstrated based on FIG. The printing substrate 1 and the backup substrate 2 are bonded together in a state where the adhesive layer 5 and the protective layer 6 described above are formed on the backup substrate 2 in advance. These base materials 1 and 2 are wound, for example, in a roll shape, and are bonded through a pressure roller or the like while being fed out in synchronization. Next, half-cut cuts are formed in the front-side printing substrate 1 and the back-side backup substrate 2. The position and shape of the cut are as described above.
[0025]
Then, the peeling piece 43 is peeled off from the opening 21. At this time, since the peeling piece 43 is connected to each other by the connecting pieces 41 and 42, when the peeling piece 43 located at the end is peeled off, the side peeling piece 43 is peeled off via the adjacent connecting piece 41. Then, the peeling pieces 43 in the connecting direction are peeled off at a time in succession such that the side peeling pieces 43 are peeled off via the adjacent connecting pieces 41. Finally, the predetermined region 11 is cut along a vertical line so as to be A4 size, and the sheet S in a form usable for a printer or the like is completed.
[0026]
As described above, in this embodiment, the connection pieces 41 and 42 are placed on the printing substrate 1 side in a state where the backup substrate 2 substantially backs up the width direction (vertical direction) cut 12b perpendicular to the connection direction. It is set to a narrow one that remains.
[0027]
As described above, if the backup base material 2 is subjected to a special cut to be the peeling piece 43 and the connecting pieces 41 and 42, the connecting pieces 41 and 42 are adjacent to each other even though the width is narrow. Since the pieces 43 are connected to each other, the peeling pieces 43 can be peeled at once while being integrally wound together with the connecting pieces 41 and 42, and the manufacturing process can be simplified.
[0028]
For this reason, it is possible to effectively eliminate a paper jam when the sheet S is used in such a manner that it passes through the printer along the connecting direction (X direction). That is, in this case, the two-layer portion (shaded portion) in which the printing substrate 1 and the backup substrate 2 are polymerized has a belt-like shape in the transport direction and is not backed up by the backup substrate 2 for printing. It is fed out by the conveying roller in parallel with the one-layer portion (the portion other than the shaded portion) where only the base material 1 remains. At this time, although the position of the transport roller differs depending on the type of printer, not all the two-layer portions forming the belt shape are transported by the transport roller, only the intermittent position is supported. A certain part is forced to follow the conveying force transmitted from the periphery. However, since the width dimension of the two-layer portion located between the two-layer portion and the two-layer portion in the direction orthogonal to the conveyance direction is narrowed, it is greatly eliminated that the conveyance force is not transmitted well and a delay is caused. The risk of this part being caught is effectively reduced. Therefore, even if the sheet S is passed through the printer in such a direction, it is possible to effectively realize a printing state with no paper jam.
[0029]
In addition, when the sheet S is used in such a manner that the sheet S is passed through the printer along the direction (Y direction) perpendicular to the connecting direction (the arrow V in FIG. 1 indicates the passing position of the roller), the paper feed roller of the printer However, at the left and right edge portions of the sheet S, the two-layer portion (shaded portion) in which the printing substrate 1 and the backup substrate 2 are polymerized and the connecting piece 41 that is a part of the backup substrate 2 are peeled off. Even if only one layer part (part other than the shaded area) where only the printing substrate 1 remains is passed, the width dimension Z of the connecting piece 41 is narrow, and the vertical direction orthogonal to the connecting direction In order to maintain the state in which most of the cuts 12b are backed up by the backup base material 2, the conveying force input to the peripheral region located outside the predetermined region 11 across the cuts 12b is effective in the predetermined region 11 In Reached is, the risk of occurrence of paper jam caused by the peeling can also be effectively reduced. In particular, if the connecting piece 41 is narrow, the ratio of the one-layer portion to the two-layer portion is small, so that the roller almost passes through the two-layer portion, and the sheet S that causes a paper jam. It is possible to reduce the difference between the paper sheets and effectively increase the smoothness.
[0030]
Conventionally, the peeling piece is peeled along the long side direction of the sheet portion to be A4, but in this embodiment, the peeling piece 43 is peeled along the short side direction of the sheet portion to be A4. As a result, it is possible to prevent the winding roller from becoming fattened early, and to prevent a situation in which the peeling direction is shifted and a winding failure occurs.
[0031]
In particular, the connecting pieces 41 and 42 have slant lines 31a and 32a that are smoothly continuous with both edges in the width direction having an angle with respect to both the connecting direction (X direction) and the direction orthogonal to the connecting direction (Y direction). Therefore, even if those width dimensions change between the connecting pieces 41 and 42 and the peeling piece 43, the peeling force is effectively transmitted not only in the X direction but also in the Y direction. It is possible to realize an appropriate peeled state without any problem.
[0032]
In addition, the printing substrate 1 and the backup substrate 2 are bonded via the bonding layer 5, and the bonding layer 5 is partially concealed between the printing substrate 1 and the bonding layer 5. A protective layer 6 is provided, and the bases 1 and 2 are bonded to each other at the portion other than the protective layer 6, and the density of the protective layer near the notches 12 a and 12 b is low, and the density of the protective layer near the predetermined region 11 is reduced. Since it is set high, the peeling piece 43 can be easily peeled off, and the backup of the notches 12a and 12b can be ensured, and the peripheral portion of the business card is used when the cut-out thing is used as a business card. Since it is reinforced by the adhesive layer 5, it is effective for preventing warping of the business card.
[0033]
In particular, if the protective layer 6 is formed in a dot shape by silk printing or the like, it is possible to easily adjust the density.
[0034]
In the present embodiment, a marginal portion is provided between the left and right predetermined areas of a portion to be a sheet, and the connecting piece 42 is also provided in this portion. However, as shown in FIG. The left and right predetermined regions may be adjacent to each other without a gap, and the shape corresponding to the connecting piece 42 may be applied to a part of the shape of the peeling piece 43 that is peeled off from the opening 21. Even in this case, when one of the left and right predetermined areas 11 is removed, the other predetermined area 11 is supported on the four sides by the backup base material 2 protruding from the top and bottom to the edge of the removed side. Therefore, it is possible to effectively avoid the deterioration of the backup function. In the case of this example, the predetermined areas 11 on the top, bottom, left and right are close to the center, so that the predetermined areas 11 to be 10 business cards can be cut out from 2 columns and 5 rows. Since the distance from the left and right edges s2 of the sheet S can be increased, it is possible to more effectively enhance the effect of preventing paper jams by more appropriately passing the conveyance roller.
Second Embodiment
The sheet shown in FIG. 4 is basically the same as in the first embodiment, the printing substrate 1 as the first substrate, and the backup substrate attached to one side of the printing substrate 1 so as to be peelable. The substrate 2 is formed, cuts 12a and 12b for cutting out the predetermined region 11 are formed in a part of the substrate 1 for printing, and the backup substrate 2 is formed on one side of the substrate 1 for printing. This is the same in that an opening 21 for opening a region located inside the predetermined region 11 is formed, and the notches 12a and 12b of the printing substrate 1 are backed up by the periphery of the opening 21.
[0035]
In addition, the opening 21 is formed by peeling the peeling piece 43 located at the corresponding portion of the backup base material 2, and via the connecting piece 44 that peels the peeling pieces 43 from between adjacent openings 21. In a state where the connection base 44 is peeled off integrally in the connecting direction in a connected state, the back-up base material 2 substantially backs up the notch 12b in the width direction (Y direction) perpendicular to the connecting direction (X direction). This is also the same as the narrowness that remains on the printing substrate 1 side. In addition, there is basically no difference in terms of providing the adhesive layer 5 and the protective layer 6 and the manufacturing process.
[0036]
However, in this embodiment, the shape of the opening 21 formed in the peeling trace of the peeling piece 43 and the shape of the connecting piece 44 are slightly different from those of the first embodiment described above.
[0037]
Specifically, the opening 21 (and hence the peeling piece 43) has a substantially rectangular shape, but the horizontal opening edge 21a is parallel to the horizontal edge s1 of the sheet S, whereas the vertical opening. The edge 21b forms a co-shaped notch that opens toward the connecting piece 44 with respect to the longitudinal edge s2 of the sheet S, and a narrow end region 21b1 is formed at the upper and lower ends of the notch. is doing. The connecting piece 44 has a hole 44a at the center in the width direction (Y direction), and both side portions of the hole 44a are linearly continuous to the end region 21b1 along the connecting direction (X direction). The backup base material 2 positioned inside the hole 44a forms a rectangular punched piece 20 together with the backup base material 2 positioned in the notch portion, and the punched piece 20 is peeled off when peeled off. It is punched and left on the substrate 1 side for printing, and the connecting pieces 44 at both edges in the width direction (Y direction) are linearly peeled along a line parallel to the connecting direction (X direction). .
[0038]
Even if it does in this way, it is the same as that of 1st Embodiment by the point which can peel off the peeling piece 43 integrally through the connection piece 44. FIG. Further, most of the vertical cuts 12b in the vicinity of the conveyance roller passing during printing can be backed up by the backup substrate 2, and most of the portion through which the roller passes is the same as the printing substrate 1. Since the smooth two-layer structure made of the backup base material 2 is used, the first embodiment also has a feature that the possibility of paper jams can be effectively reduced by passing the sheet X through the printer from any direction. Has the same effect as. The same applies to other effects.
[0039]
The specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
[0040]
【The invention's effect】
Since the present invention has the configuration described above, for example, when a business card is printed by a printer, the back-up side of the back-up base material opening is used to back up the cut-out of the base material for printing in a state where double-sided printing is possible . working that preparative strip the release strip located inside, it is possible to efficiently release strip through a connecting piece located on the inside of the groove which communicates between the openings adjacent to the transverse direction in a state linked with each other. In addition, by making such a groove narrow, the conveying force is efficiently transmitted to the entire sheet when the conveying roller passes, and a paper jam occurs regardless of which direction the sheet is passed through the print. Can be effectively reduced.
[0041]
Therefore, according to the sheet of the present invention, the existing processing line is greatly modified to improve the production efficiency of the sheet and to improve the printing speed through smooth feeding (especially continuous feeding) during use. The time and labor required for these can be greatly reduced.
Conventionally, the peeling piece is peeled along the long side direction of the sheet, whereas in the sheet manufacturing method of the present invention, the peeling piece is peeled along the short side direction of the sheet. Therefore, it is possible to prevent the winding roller from becoming fattened at an early stage, and to prevent a situation in which the peeling direction is shifted and a winding failure occurs.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of the present invention from the side of a backup substrate.
FIG. 2 is a process explanatory view showing a manufacturing process of the embodiment.
FIG. 3 is a view showing a modification of the first embodiment.
FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.
[Explanation of symbols]
1 ... 1st base material (base material for printing)
2 ... Second base material (back-up base material)
DESCRIPTION OF SYMBOLS 5 ... Adhesive layer 6 ... Protective layer 11 ... Predetermined area | region 12a, 12b ... Notch 21 ... Opening 41, 42, 44 ... Connection piece 43 ... Stripping piece 44a ... Hole X ... Connection direction Y ... Direction orthogonal to connection direction Z ... Width Size

Claims (1)

A first base material having a rectangular shape in which the length of the vertical edge is larger than the length of the horizontal edge, and having a cut for cutting out a predetermined region in part, and the length of the horizontal edge A sheet having a rectangular shape in which the length of the edge in the vertical direction is increased, and the second base material attached to the one surface of the first base material so as to be peelable corresponds to the edge in the vertical direction. A first base material and a second base material, each having a shape whose width dimension is the same as the length of the longitudinal edge of the sheet and which extends in a direction corresponding to the lateral direction of the sheet. And is manufactured by sequentially cutting the parts that should become sheets in the lateral direction ,
Before the cutting, the peeled piece that is part of the second base material and is cut and raised to form an opening in the second base material from the pasted first base material and second base material And connecting pieces adjacent to each other in a state where the connecting pieces that are part of the second base material and are cut and raised to form a groove in the second base material are connected to each other and sandwiching the position to be cut In a state where the pieces are connected to each other, the peeling piece and the connecting piece are continuously peeled from the first base material,
The shape of the manufactured sheet
The second base material is formed by peeling the release piece, and has an opening that opens an area located on the inner side of the predetermined area on one side of the first base material. Open the left side to the left side through a groove formed by peeling the connecting piece between the left side and the vertical edge on the left side, and the right side of the right end opening between the right side and the vertical edge. Open to the right side through a groove formed by peeling the connecting piece to each other, and the openings adjacent to each other in the lateral direction are mutually connected via a groove formed by peeling the connecting piece between the openings. Communicate with
The groove is narrower than the opening,
Both edges in the width direction of the groove are slanted lines that have an angle with respect to both the vertical direction and the horizontal direction, and are formed between the opening and the vertical edge. A method for producing a sheet, characterized by having a shape that becomes narrower toward the edge.

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