JP5117751B2 - Seal sheet - Google Patents

Description

  The present invention relates to a seal sheet.

  The seal sheet is a sheet-like information recording base material (also referred to as a surface layer sheet) having an adhesive layer on the back surface, and a sheet-like release base material (attached to the back surface of the surface layer sheet via the adhesive layer) A releasable information recording sheet. The seal sheet can be cut into sections of the desired shape with a cutter or scissors, and the surface sheet is recorded with information such as the desired picture, text, image, and color by printing or handwriting before or after cutting. Therefore, for example, a photograph printed on a surface layer sheet or a modified image thereof can be cut out into a free frame and used on a mount or article.

  Although the sealing sheet can be freely cut as described above, there is a problem that it is difficult to peel off the surface layer sheet because the adhesion between the surface layer sheet and the release sheet becomes strong at the cut edge. For this reason, in advance, there is a release sheet in which a cut line as a peeling start point is put, and the release sheet is divided along the longitudinal direction. For example, two parallel cut lines are put in the longitudinal direction to form the release sheet. A commercial product divided into three strips is known. As for the shape of the cut line serving as the dividing line, there is also a proposal of meandering in a sine wave shape or a sawtooth shape along the paper feeding direction at the time of printing (see Patent Document 1).

JP 2005-128458 A

When cutting and using the seal sheet in various desired shapes as described above, in particular, it becomes difficult to peel the surface sheet from the release sheet as the cut piece becomes a small piece, while repeatedly trying to peel, The surface sheet may be damaged by nails, wrinkles may occur, and fingertips may be damaged. The cut piece of a small piece may not be applied at all to the dividing line which the conventional peeling sheet has, and in this case, the dividing line cannot be a peeling start point.
Accordingly, an object of the present invention is to provide a seal sheet that can easily peel the surface layer sheet from the release sheet regardless of the shape and size.

  The present inventor has intensively studied in view of the above, and even if it is a small piece or cut out into any shape, it is much easier to peel off than in the past, and it is a problem such as turning over when feeding and transporting paper during printing In order to solve the above-mentioned problems, the present invention as described below has been completed.

(1) A sheet-like information recording substrate having an adhesive layer on one side, and a sheet-like release substrate attached to the information recording substrate via the adhesive layer,
The sealing sheet in which the release substrate has a plurality of slits that do not contact the outer edge and / or contact the outer edge only at one point.
In the present invention, it is preferable to have a plurality of slits that do not contact at least the outer edge.
(2) The seal sheet according to (1), wherein the length of at least one of the plurality of slits is 3 to 100 mm.
(3) The seal sheet according to (1) or (2), wherein a distance between at least two of the plurality of slits is 3 to 100 mm.
(4) The seal sheet according to any one of (1) to (3), wherein at least two of the plurality of slits are substantially parallel.
(5) The seal sheet according to any one of (1) to (4), wherein at least two of the plurality of slits are arranged in a matrix on the release substrate.
(6) The seal sheet according to any one of (1) to (5), wherein an angle formed by at least one of the plurality of slits and a longitudinal outer edge of the sheet is 20 to 80 degrees.
(7) A first slit row comprising a plurality of slits arranged in parallel with each other at an angle of 20 to 80 degrees along the outer edge in the longitudinal direction of the seal sheet, and orthogonal to each slit of the row The seal sheet according to (6), wherein the second slit row formed of the slits of angles is alternately arranged in parallel without intersecting the slits.
(8) The seal sheet according to any one of (1) to (7), wherein the release substrate further has a cut line that contacts the outer edge at two points.

  According to the present invention, it is possible to provide a seal sheet that makes it much easier to peel off an information recording base material on which an information recording portion is formed and a peeling base material than in the past.

  Hereinafter, the seal sheet of the present invention will be described based on a preferred embodiment shown in the accompanying drawings. However, the present invention is not limited to this embodiment.

  FIG. 1 is a schematic view of an embodiment of the seal sheet of the present invention. 1A is a plan view, and FIG. 1B is an end view taken along the line IB-IB in FIG. 1A. In FIG. 1B, for easy understanding, the width of the slit is schematically enlarged and illustrated, but actually, there is no width, and both side portions may be in contact with each other.

A seal sheet 10 shown in FIG. 1 includes a peeling substrate 12 and an information recording substrate 14 attached to the surface of the peeling substrate 12.
Here, of the two main surfaces of the release substrate, the surface on which the information recording substrate is adhered is the “front surface”, but the opposite surface is hereinafter referred to as the “back surface”. Of the two main surfaces of the information recording substrate, the surface adhered to the peeling substrate is referred to as “back surface”, and the opposite surface is referred to as “surface”. That is, in the seal sheet of the present invention, the surface of the release substrate and the back surface of the information recording substrate are adhered.

Here, the peeling substrate 12 has a sheet shape and functions as a base on which the information recording substrate 14 is attached. The material of the peeling base material 12 is not particularly limited as long as the information recording base material 14 can be detachably attached to the surface of the base material 12 through an adhesive layer to be described later. For example, conventionally known paper , Fibers, plastics, metals, and composites thereof. Among these, release paper subjected to surface treatment such as silicon processing is preferable.
The size and thickness of the release substrate 12 are not particularly limited. In the case where information is recorded on the surface of the information recording base material 14 to be described later using a printing machine that is usually used, it is preferable that the size corresponds to a standard such as A4 or B4, and the sealing sheet 10 of the present invention is used. It is preferable that the thickness is such that it can be printed with such a printing press.

The information recording substrate 14 is in the form of a sheet, and information can be recorded on the surface. The information recording method is not particularly limited, and examples thereof include various types of printing such as ink jet printing, laser printing, and multi-printing; various types of writing tools such as pens, pencils, brushes, sprays, and crayons; It is done. The material of the information recording base material 14 is not particularly limited as long as it can record information on the surface, and examples thereof include paper (for example, inkjet printing paper), plastic, metal, and a composite thereof. .
The information recording base material 14 is the same as the sheet base material 12 in terms of size and thickness, and is not particularly limited. The size is preferably about the same as that of the release substrate 12.

  The back surface of the information recording substrate 14 has an adhesive layer (not shown). The pressure-sensitive adhesive layer is appropriately formed from conventionally known pressure-sensitive adhesives, adhesives and the like according to the type, purpose, etc. of the article to be peeled off and finally peeled off from the peeling base material 12. Just do it. The method for forming the adhesive layer is not particularly limited.

In such a seal sheet 10, the peeling substrate 12 has a plurality of slits 16 that do not contact the outer edge 17 and / or slits 18 that contact the outer edge 17 only at one point. FIG. 1 when the slit 18 is included is a reference diagram of the present invention.
A slit means here the linear cut | interruption formed in the peeling base material so that it might reach the surface from the back surface. In the present invention, a slit that is independent of and does not touch or intersect with other linear cuts is defined as one slit. Therefore, the slit may be one line break (one line having one start point and one end point, and one line segment connecting the two points). In some cases, the cuts are in the form of intersections (those that can be regarded as having one start point and a plurality of end points) or in the form of closed curves. The line may be a straight line or a curved line.

  In such a situation, the slit is preferably a single linear cut, and more preferably a substantially straight cut. This is because, if such a slit is provided, the information recording substrate at the cut-out portion can be easily peeled off from the release substrate as compared with the conventional case.

Further, the phrase “the slit does not contact the outer edge” means a state in which the slit breakage does not reach the outer edge of the peeling substrate. Accordingly, for example, the slit 16 in FIG. 1 is a “slit that does not contact the outer edge” because the cut does not reach the outer edge 17.
Moreover, the slit “contacts with the outer edge only at one point” means that the slit has reached the outer edge of the peeling substrate, but the point that the slit has reached is one point (one point). Therefore, for example, in FIG. 1, the slit 18 is a “slit that contacts the outer edge only at one point” because the cut reaches the outer edge 17 only at one point of the contact F.

  The slit does not need to be cut at all portions of the line (from the back surface of the peeling substrate to the surface). For example, it may be perforated.

  The length of the slit is preferably 3 to 100 mm, more preferably 3 to 50 mm, and more preferably 5 to 15 mm, at least one of the plurality of slits of the peeling substrate. More preferably, it is 6-10 mm. In addition, it is preferable that 90% or more of the slits in the number range are in the above range with respect to all the slits of the peeling substrate. The number percentage is more preferably 95% or more, and even more preferably 99% or more. This is because, if the release substrate has a plurality of slits satisfying such a length, it is easier to peel off the information recording substrate at the cut-out portion from the release substrate as compared with the conventional case.

  In addition, when the slit has one linear cut, the length means the length of one line (line segment) connecting one start point and one end point.

  Moreover, although the distance between such slits is not specifically limited, it is preferable that at least two distances among the plurality of slits of the peeling substrate are 3 to 100 mm, and more preferably 3 to 50 mm. . Moreover, it is preferable that the distance between the slits in the slit of 90% or more by number percentage is in the above range with respect to all the slits of the peeling substrate. The number percentage is more preferably 95% or more, and even more preferably 99% or more. This is because, if the peeling substrate has a plurality of slits at such a distance between the slits, it is easier to peel off the information recording substrate at the cut-out portion from the peeling substrate as compared with the conventional case.

The distance between the slits means the shortest distance between one slit and another slit adjacent thereto. Here, “adjacent slits” mean slits having the shortest distance from one slit. That is, the distance between slits means the shortest distance among the shortest distances between one slit and another slit.
Therefore, for example, two slits as shown in FIG. 2A, specifically, one straight cut, each having the same length and parallel to each other, a slit 20a and a slit 22a, The distance is A1 shown in FIG.
In addition, for example, as shown in FIG. 2B, each is a single straight cut, and the distance between the slit 20b and the slit 22b formed on the same straight line is between the ends of the two straight lines. The distance, which is A2 shown in FIG.
Among the above, when the distance between the slits is the distance between the slit ends indicated by A1 and A2, it is more preferably 5 to 15 mm, and further preferably 6 to 10 mm.

Moreover, it is preferable that at least two of the plurality of slits of the peeling base material of the seal sheet of the present invention are substantially parallel.
Moreover, it is preferable that 90% or more of the slits in number percentage are substantially parallel to all the slits of the release substrate. The number percentage is more preferably 95% or more, and even more preferably 99% or more. This is because the sealing sheet of the present invention having such a substantially parallel slit in the peeling substrate is easier to peel off the information recording substrate at the cut-out portion from the peeling substrate than in the past.

  Moreover, it is preferable that at least two of such slits are arranged in a matrix on the release substrate. Moreover, it is preferable that 90% or more of slits are arranged in a matrix with respect to all the slits of the peeling substrate. The number percentage is more preferably 95% or more, and even more preferably 99% or more. This is because if the slits are arranged in a matrix on the release substrate in this way, the information recording substrate at the cutout portion is easier to peel from the release substrate than in the past.

FIG. 3 shows an example of slit arrangement in a preferred embodiment of the seal sheet of the present invention.
FIG. 3 is a plan view showing the back surface of the sealing sheet 30 of the present invention, that is, the back surface of the peeling substrate 32, and all of the plurality of slits 36 that do not contact the outer edge 37 of the peeling substrate 32 are rectangular sealing sheets 30. Are arranged in a row direction and a column direction parallel to the short side and the long side. In this figure, for the sake of explanation, an arrangement of matrix slits of 8 rows and 6 columns is schematically shown.

In the seal sheet 30 of the present invention shown in FIG. 3, the plurality of slits 36 are all the same length and substantially parallel to each other, and further, the distance between the slits in the row direction and the column direction which is a direction perpendicular thereto. (B1 and B2 in FIG. 3) have the same length, but the seal sheet of the present invention is not limited to such an embodiment. For example, the lengths of the slits may be different or may not be parallel to each other. In the case of the seal sheet 30 of the present invention shown in FIG. 3, the row direction and the column direction in which the slits 36 are arranged are parallel to the long side and the short side of the rectangular seal sheet shown in FIG. The seal sheet of the present invention is not limited to such an embodiment. For example, any one direction on the back surface of the peeling substrate may be a row direction, and a direction perpendicular thereto may be a column direction. Furthermore, the row direction and the column direction do not have to form a right angle.
Further, in the seal sheet 30 shown in FIG. 3, the slits are arranged in a matrix of 8 rows and 6 columns, the number of slits is the same in all rows, and the number of slits is 8 in all columns. However, in the seal sheet of the present invention, the number of slits arranged in the rows and columns may be different for each row and column.

For example, the seal sheet of the present invention may be the seal sheet shown in FIG.
FIG. 4 is a plan view showing the back surface of the peeling substrate 52 of the sealing sheet 50 of the present invention, and all of the plurality of slits 56 that do not contact the outer edge 57 of the peeling substrate 52 are arbitrary on the back surface of the peeling substrate 52. Are arranged in a matrix in one direction and a direction substantially perpendicular thereto. Further, all the plurality of slits 56 have the same length and are substantially parallel to each other, and the distance between the slits is also the same length. The number of slits arranged in rows and columns is different for each row and column. FIG. 4 is a diagram schematically showing the arrangement of the slits, and the number of slits and the distance between the slits are not limited to this figure.
When recording information on the information recording base material of the rectangular sticker sheet as shown in FIGS. 3 and 4, when recording information that is cut in a direction parallel to the long side or the short side of the sticker sheet There are many. In such a case, the sealing sheet as shown in FIG. 4 has a higher probability of cutting so as to cut any linear slit as compared with the sealing sheet as shown in FIG. Therefore, the information recording base material at the cutout portion is easily peeled off from the release base material.

In such a seal sheet of the present invention, it is preferable that the release substrate further has a score line that contacts the outer edge at two points. In such a case, particularly when the size of the information recording portion is relatively large, it is easy to peel it off from the peeling substrate.
The “cut line” means a linear cut formed so as to reach the surface from the back surface of the peeling substrate.
Such a seal sheet is, for example, the seal sheet shown in FIG.

  FIG. 5 is a plan view showing the back surface of the peeling substrate 42 of the seal sheet 40 of the present invention, and the peeling substrate 42 has a plurality of slits 46 that do not contact the outer edge 47 thereof. The slits 46 are arranged in a matrix in the row direction and the column direction parallel to the short side and the long side of the rectangular seal sheet 40. Each of the plurality of slits 46 has the same length and is parallel to each other, and the distance between the slits (E1 and E2 in FIG. 5) in the row direction and the column direction is the same length. The slit 46 further has a cut line 48a in contact with the outer edge 47 at two points C1 and C2, and a substantially straight cut line 48b in contact with the outer edge 47 at two points D1 and D2. ing.

In addition, although the sealing sheet 40 shown in FIG. 5 has two cut lines, one may be sufficient and three or more may be sufficient.
Moreover, although the seal sheet 40 has substantially straight cut lines 48a and 48b, the seal sheet of the present invention may not be substantially straight. For example, it may be a curved line, a wavy line, or a meandering line.
The seal sheet 40 has cut lines 48a and 48b in a direction parallel to the long side of the rectangle. In the seal sheet of the present invention, the cut line is a direction parallel to the short side of the rectangle. It may be a direction that is not parallel to the sides of the rectangle. Two or more score lines may intersect.
Further, in the seal sheet 40, the cut line 48a does not cross the slit 46, but may cross the slit 46 like the cut line 48b. It is easier to peel off the information recording substrate and the peeling substrate at the cut-out portion along the cut line if they do not intersect like the cut line 48a.

In the above-described aspect, it is preferable that an angle formed by at least one of the plurality of slits (for example, 16 and 18 in FIG. 1) and the outer edge of the sheet (for example, 17 in FIG. 1) is 20 to 80 degrees. . This angle is also an angle with respect to the cut line 48a or 48b when the cut line shown in FIG. 5 is provided. This is because the information recording base material and the release base material at the cut-out portion are more easily peeled off along the outer edge or cut line of the sheet.
Here, when the slit and the outer edge (or cut line) of the sheet intersect or contact each other, this angle means an acute angle of angles formed by the slit and the cut line. In addition, when the slit and the outer edge (or cut line) of the sheet do not intersect or contact each other, it means the acute angle of the angle formed by the extension line of the slit and the outer edge (or cut line) of the sheet. To do.
In FIG. 5, α1 and α2 indicate these angles. In FIG. 5, α1 is an acute angle of the angles formed by the extension line of the slit 46 and the cut line 48a. Α2 is an acute angle of the angles formed by the cut line 48b and the slit 46 intersecting with the cut line 48b.

  The angle formed by at least one of the plurality of slits 46 in FIG. 5 and the cut line 48 is preferably 20 to 80 degrees, more preferably 30 to 60 degrees, and 40 to 50. More preferably, the degree. For example, 45 degrees is one of the preferred specific embodiments. This is because it is easier to peel off the information recording base material and the peeling base material at the cut-out portion along the cut line.

FIG. 6 is a plan view (back view of seal sheet) showing a preferred slit arrangement example of the present invention. In this aspect, along the longitudinal outer edge 102 of the seal sheet 100, an angle of 20 to 80 degrees is formed with the outer edge 102, and the first slit row 110 including a plurality of slits 111 arranged in parallel to each other, and the slit 111 The second slit rows 120 made up of the slits 121 having orthogonal angles are arranged alternately in parallel without intersecting the slits. That is, the slits 111 and 112 are arranged in a net pattern on the entire surface of the peeling substrate 101. The seal sheet 100 of this embodiment is the same as the embodiment shown in FIG. 1 except that the planar arrangement pattern of the slits is different, and the cross section of the information recording substrate (not shown), the peeling substrate 101 and the slits 111 and 121 The structure is similar to that shown in FIG.
The peeling substrate 101 has two cut lines 103 formed in the longitudinal direction.

  FIG. 7 is an enlarged view of a portion VII in FIG. 6 for more specifically explaining the arrangement of the slits. In FIG. 7, the slits 11 of the first slit row 110 form an angle of 45 degrees with the sheet outer edge 102. The slit 121 of the second slit row 120 is an angle orthogonal to the slit 111 and the angle with the sheet outer edge 102 is 45 degrees. The slits 111 and 121 are both 7 mm long.

  In the case of such a pattern, the distance between each slit is the distance between the slits in each row, and the first slit row 110 will be described among the preferable distances 3 to 100 mm, more preferably 3 to 50 mm shown above. In this case, the distance between the slit ends 111a and 111a (or between 111b and 111b) is more preferably 5 to 15 mm, and further preferably 5 to 10 mm. FIG. 7 typically shows an equal interval of 7 mm. The slit interval in the first slit row 110 and the slit interval in the second slit row 120 are preferably equal to each other. Further, the distance between the first slit row 110 and the second slit row 120 is the distance between the ends of the slits 111 and 121, for example, 111a (or 111b) and 121a (or 121b) (A1 in FIG. 2). The distance corresponding to A2) is more preferably 5 to 15 mm, and further preferably 5 to 10 mm. FIG. 7 typically shows 5 mm. In the pattern shown in FIG. 7, the shortest distance between adjacent slits is the distance from 111a (or 111b) to 121 at a position orthogonal to this, and is typically about 3.5 mm.

  In the patterns of FIGS. 6 and 7, when the slits are arranged at the above distance, the line connecting the slit ends of the first slit row 110 and the second slit row 120 is substantially a common line. Specifically, a line connecting the slit ends 111a and a line connecting the slit ends 121b are common, or a line connecting the slit ends 111b and the slit ends 121a is common. Such an arrangement allows the slits to be present at high density. For example, when a 7 mm slit is arranged in the pattern shown in FIG. 6 on a 75 mm × 285 mm release base 101, the first slit row 110 composed of 28 slits 111 has 8 rows and 29 rows. The second slit row 120 including the slits 121 can be alternately arranged with seven rows (see between the two cut lines 103 and 103 in FIG. 6).

That is, in the mode of the mesh pattern shown in FIGS. 6 and 7, since the slits are present evenly, the probability of including any one of the slits regardless of the shape or the small piece is very high. For this reason, in particular, in the case of this mesh pattern, there is no problem even if there are no slits at the four sides of the peeling substrate 101, and the effect of easy peeling is sufficiently exhibited. Considering turning-up from slits during printing, it is preferable that there are no slits at the ends of the four sides. The distance from the outer edge of the peeling substrate 101 that forms the four-side ends without slits is usually 3 to 3 independently as in the above-mentioned distances between the slits. 100 mm, more preferably 3 to 50 mm, and typically about 5 to 10 mm.
Further, from the cut line 103, there may be a portion having a predetermined distance and no slit as described above.

As mentioned above, although the sealing sheet which is a suitable embodiment of this invention was demonstrated, this invention is not limited to the above example, In the range which does not deviate from the summary of this invention, even if various improvement and a change are performed. Good.
For example, the information recording base material of the seal sheet of the present invention may have slits and cut lines, and a label may be formed therefrom.

  Moreover, the manufacturing method of the sealing sheet of this invention is not specifically limited. For example, it can be manufactured by attaching a release substrate to an information recording substrate provided with an adhesive layer on the back surface. A known material can be selected and used for the information recording substrate, the adhesive layer, and the release substrate.

Next, a method for using the seal sheet of the present invention will be described with reference to FIG.
FIG. 8 is a view showing a state where the information recording substrate 34 of the seal sheet 30 shown in FIG.
For example, first, desired information is recorded by handwriting or using a printer or the like on the surface of the information recording substrate 34 of the seal sheet 30 of the present invention. Next, the information recording base material on which the information is recorded is cut into a desired shape using scissors or a cutter and cut out. And in the part of the slit 36 of the edge part of the cut-out sealing sheet, the peeling base material 32 is lifted from the information recording base material 34, this is pinched with a finger, and the peeling base material 32 is peeled. In the above description, the mode in which information is recorded on the sticker sheet before cutting is described. Needless to say, the information may be recorded after cutting, but the sticker sheet after cutting in advance, and further for information recording. After the base material 34 is peeled off from the peeling base material 32 and attached to the article, it can be recorded by handwriting or the like.

Here, since the sealing sheet of the present invention has a plurality of, preferably many, slits, it is cut so as to cut any linear slit in cutting. And since the peeling base material can be easily floated from the information recording base material in the slit contacting the edge of the cut seal, the information recording base material and the peeling base material can be easily peeled off. .
On the other hand, the conventional product without such a slit cannot be easily peeled off because there is no part that causes the cut out information recording substrate and the peeling substrate to be peeled off. In addition, in the case of having a slit corresponding to a small number, for example, having only a few slits as referred to in the present invention, for example, depending on the cut-out shape, a relatively small cut piece In some cases, there is a high possibility that a slit will not be provided, and it cannot be easily peeled off as in the conventional product without a slit.

It is a schematic diagram of one embodiment of the seal sheet of the present invention. It is a schematic diagram for demonstrating the distance between slits which the peeling base material of the sealing sheet of this invention has. It is a schematic diagram of another embodiment of the seal sheet of the present invention. It is a schematic diagram of another embodiment of the seal sheet of the present invention. It is a schematic diagram of another embodiment of the seal sheet of the present invention. It is a schematic diagram of another embodiment of the seal sheet of the present invention. It is the VII section enlarged view of FIG. It is explanatory drawing of the usage method of the seal sheet of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Seal sheet 12 Peeling base material 14 Information recording base material 16 Slit 17 Outer edge 18 Slit F Contact 20a, 20b Slit 22a, 22b Slit A1, A2 Distance between slits 30 Seal sheet 32 Peeling base material 34 Information recording base material 36 Slit 37 Outer edge B1, B2 Distance between slits 50 Seal sheet 52 Peeling substrate 56 Slit 57 Outer edge 40 Seal sheet 42 Peeling substrate 46 Slit 47 Outer edge 48a, 48b Cut line C1, C2, D1, D2 Cut line and outer edge and intersection E1, E2 Distance between slits α1, α2 Angle formed by slit line and slit 100 Seal sheet 101 Peeling substrate 102 Outer edge 103 Cut line 104, 105 Edge portion 110 First slit row 111 Slit 120 Second slit row 121 Lit

Claims (5)

A sheet-like information recording substrate having an adhesive layer on one side, and a sheet-like release substrate attached to the information recording substrate via the adhesive layer;
The release substrate may have a Ifuku number of slits in contact with its outer edge, the slits do not have contact with the outer edge thereof, the sealing sheet. Wherein at least one of the plurality of slits is the angle from 20 to 80 ° formed between the longitudinal outer edge of the sealing sheet, the sealing sheet according to claim 1. A sheet-like information recording base material having an adhesive layer on one side; and a sheet-like release base material attached to the information recording base material via the adhesive layer. Has a plurality of slits that do not contact the outer edge and / or contact the outer edge only at one point, and form an angle of 20 to 80 degrees with the outer edge along the longitudinal outer edge of the seal sheet , and are parallel to each other a first slit row consisting of a plurality of slits arranged in a second slit row consisting of the angle of the slit perpendicular to the slits of said column were alternately arranged in parallel without intersecting slits each other, shea Sheet. A sheet-like information recording base material having an adhesive layer on one side; and a sheet-like release base material attached to the information recording base material via the adhesive layer. Has a plurality of slits that do not touch the outer edge and / or touch the outer edge only at one point;
The release substrate is further that having a cut line which is in contact at its outer edge and two points, shea Rushito. The seal sheet according to claim 4, wherein an angle formed by at least one of the plurality of slits and a longitudinal outer edge of the seal sheet is 20 to 80 degrees.

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