JPH0355977Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial field of application) This invention is suitable for preventing replacement by sticking to the opening of a container, for example, because when the surface layer is peeled off by hand, the easily broken layer underneath is destroyed. ,
Concerning sealing pieces. (Prior art) Conventional wrapping paper that is pasted to the opening of a container to indicate its unopened status may be used, for example, on a display shelf at a store, depending on the material of the opening of the package and its surface treatment method. You can pick up the lined products and easily peel them off on the spot, and you can reapply the package after foreign matter has gotten into the package so that it will not be obvious that it has been removed, so you can easily seal the package from the outside. You can't tell if the package has already been opened just by looking at the paper. Therefore, there is a risk that the contents of the package may be tampered with. For example, poisonous substances may be mixed in with sweets in a package. Therefore, recently, adhesive labels that can be seen to be peeled off after being pasted have become available on the market, and are disclosed in Utility Model Application Publication No. 1077/1983. This adhesive label is attached by peeling off the release sheet and pressing the exposed adhesive layer against the opening (not shown) of the package. When the adhesive label affixed to the opening is peeled off, only the part of the deposited film that was not directly deposited on the film substrate by the release agent coating is adhered to the opening by the adhesive coating. remain as is. Furthermore, when the opening is opened, the remaining vapor deposited film stuck to the opening is cut or torn, thereby making it possible to determine whether the opening has been opened. (Problem that the invention aims to solve) However, with such adhesive labels, when the film is peeled off, part of the vapor deposited film is difficult to remain on the adhesive coated surface, and it is difficult for some of the vaporized film to remain on the adhesive layer when the film is peeled off. It is not easy to form characters or the like with the remaining vapor deposited film after it has been peeled off. Furthermore, when the film base material is peeled off, a portion of the adhesive coating remains on the adhered part of the adhered material, and the surface of the exposed adhesive coating becomes sticky and collects dust. It also had problems in terms of hygiene. Therefore, the main purpose of this invention is to provide a sealing piece that can be recognized as being peeled off after being pasted, and that no adhesive appears on the peeled surface and does not become sticky. (Means for Solving the Problem) This invention provides a surface material, an easily broken layer laminated on one main surface of the surface material, and a first method that facilitates peeling between the surface material and the easily broken layer. a second release layer formed on a part of the main surface of the easily broken layer; and a coating layer formed on the second release layer side main surface of the easily broken layer; an adhesive layer formed on the main surface of the coating layer, where a is the adhesive force between the first release layer and the easily broken layer, and b is the adhesive force between the second release layer and the coating layer. , is a sealing piece that satisfies the following formula a>b. (Function) The adhesive strength between the first release layer and the easily broken layer is
The adhesion force between the second release layer and the covering layer is greater than that of the second release layer. The adhesive strength of each part of the sealing piece attached to the material is
There is a difference between the part where the second release layer is formed and the part where it is not formed, and when the surface material is peeled off, the border between the part where the second release layer is formed and the part where it is removed is The easily broken layer is torn, and the easily broken layer and the coating layer remain on the surface of the adhered material in the portion where the second release layer is removed, and the other portions are peeled off from the coating layer. (Effect of the invention) According to this invention, the adhesive force between the first release layer and the easily broken layer is greater than the adhesive force between the second release layer and the coating layer, and the second release layer is formed on the main surface of the easily destructible layer with a part removed, so the adhesive force between the covering layer and the easily destructible layer is different between the part where the second peeling layer is formed and the part where the second peeling layer is removed. , the adhesive strength is different, and when the surface material is peeled off,
Only the portion of the easily broken layer where the second peeling layer is formed is peeled off from the covering layer. Therefore, it can be seen that the easily broken layer has been separated because it is torn and separated from the other parts and cannot be reattached to the original state. Therefore, it can be seen at a glance that the adhesive sealing piece has been peeled off, and it can also be easily determined whether a poisonous substance or the like has been mixed into the package. In addition, since a coating layer is formed over the entire surface of the adhesive layer, the surface of the adhesive layer will not be exposed and sticky after the surface material is peeled off, unlike conventional methods. Furthermore, it becomes impossible to reattach the surface material due to the adhesive force of the exposed adhesive layer. The above-mentioned objects, other objects, features and advantages of the present invention will become clearer from the following detailed description of embodiments with reference to the drawings. (Example) FIG. 1 is a sectional view of a sealing piece that is an example of this invention. This sealing piece 10 is temporarily attached on a release sheet 12, and an adhesive layer 14, a covering layer 16, a second release layer 18, an easily broken layer 20, a first release layer 22, and a surface material 24 are sequentially attached. A printed layer 26 is formed on the surface of the surface material 24. The surface material 24 is formed to prevent the easily destructible layer 20 from being cut or torn, and is temporarily attached to the easily destructible layer 20 via the first peeling layer 22 . The surface material 24 may include, for example, polyethylene terephthalate film, polyester or nylon film, which are relatively stiff and hard to shrink due to heat, or paper or synthetic paper, which will be described later. Thus, in order to be able to clearly see the traces of peeling from the surface side of the surface material 24 when the sealing piece 10 is peeled off, it is better to select a transparent or semi-transparent one. In this way, it is easy to see that a part of the easily broken layer 20 remains on the adhered material A, and that a part has been peeled off from the adhered material A and is stuck to the surface material 24. It becomes convenient. The first peeling layer 22 includes a surface material 24 and an easily broken layer 2.
Temporarily adhere the surface material 2 and 2 so that it cannot be reattached.
4 and the easily broken layer 20, for example, it is made of a release agent layer coated with a release agent such as silicone resin, fluororesin, paraffin, wax, etc. layer 20. The easily destructible layer 20 is a vapor deposited layer formed by vacuum vapor depositing an evaporative substance such as aluminum, silver, zinc, etc.
It is a highly breakable layer that can be easily torn by hand. Instead of the vapor deposited film formed by the vacuum vapor deposition method described above, this easily destructible layer 20 may be formed by, for example, a printed layer formed by solid silver printing, or by using other UV type inks. It can also be formed by coating with a printed film or other resin. However, when this sealing piece 10 is bent and attached to a bent part, the surface material 24 has a relatively flexible structure that does not peel off when it tries to restore to its original state against the adhesive force of this easily breakable layer 20. The richer the better. Other examples of the easily breakable layer 20 include a synthetic resin such as a copolymer resin of vinyl chloride and acrylic in which metal powder is mixed into the synthetic resin so that it can be cut or torn by applying a relatively weak force. Examples include a resin layer formed by coating with resin. The second release layer 18 is formed by pattern-coating a release agent such as silicone resin, fluororesin, wax, etc. on a part of the surface of the easily broken layer 20. For example, by pattern printing and coating lines such as letters or pictures such as "opened", the surface material 24 is peeled off as described later,
When the easily destructible layer 20 is destroyed, lines such as the above-mentioned characters "opened" appear,
It is possible to form a sealing piece 10 that more closely matches the purpose of use. The covering layer 16 is a layer that covers the adhesive layer 14 in order to prevent the adhesive layer 14 from being exposed to the surface and becoming sticky when the surface material 24 is peeled off as described later. This coating layer 16 is made of a resin such as urethane resin, EVA resin, PVA, salt vinyl acetate, acrylic, nitrocellulose, polyamide, acrylic, etc., and the second release layer 1 of the easily broken layer 20.
8 is formed by coating the surface. The adhesive layer 14 is for giving adhesive force to the sealing piece 10 to adhere to the adhered material A, and is made of an adhesive layer coated with a pressure-sensitive adhesive, for example, and is formed on one main side of the covering layer 16. formed on the surface. A release sheet 12 is temporarily attached to the main surface of the adhesive layer 14 to protect the adhesive layer 14. This sealing piece 10 has an adhesive force of a between the first release layer 22 and the easily broken layer 20, and a second release layer 18.
The adhesive force between the and the coating layer 16 is b, the adhesive force of the adhesive layer 14 is d, the force required to peel the release sheet 12 from the adhesive layer 14 is c, and the force required to destroy the easily breakable layer 20. is configured to satisfy the following formula c<b<e<a<d. To use this sealing piece 10, it is peeled off from the release sheet 12 and attached to the opening of a candy package or can using the adhesive layer 14, for example, as shown in FIGS. 9a, b, and c. do. In this way, in order to open the opening of the package to which the sealing piece 10 is attached, it is necessary to peel off the attached sealing piece 10 and open the sealed part. In this case, the easily broken layer 20 is the first release layer 22
The easily broken layer 20 is temporarily attached to the surface material 24 through the
is strongly adhered to the covering layer 16, and the second release layer 1
In the region where 8 is formed, the covering layer 16
The bond is weaker than the part that is directly bonded. Therefore, as shown in FIG. 2, when the surface material 24 is peeled off, the easily broken layer 20 in the second release layer 18 portion and the easily broken layer in the portion directly adhered to the covering layer 16 are removed. At the boundary with 20,
The easily destructible layer 20 is torn, and at the same time, the coating layer 16 is peeled off from the main surface of the second peeling layer 18, and a part of the easily destructible layer 20 (the part where the second peeling layer 18 is formed) is separated. While remaining adhered to the surface material 24,
It will be peeled off from the adhered material A. Then, in the easily broken layer 20, the portion where the second release layer 18 is not formed remains stuck to the adhered material A as it is. Therefore, once the surface material 24 is peeled off, the easily broken layer 20 becomes the second layer.
The surface material 24 is broken at the boundary between the part where the peeling layer 18 is formed and the part where it is not formed, and the surface material 24 cannot be reattached to the surface of the covering layer 16, and the original state is restored. Since it cannot be restored, it is obvious that the package has been opened. In this specification, sheets, films, and their equivalents are collectively referred to as "sheets" or "films," indicating the most suitable one in each case. Furthermore, when the term "sheet" is used, it does not only refer to single-wafer type sheets, but also includes roll-up type (web) types. Hereinafter, in order to further clarify the embodiments of this invention, further explanation will be given based on an example of a method for manufacturing a sealing piece according to this invention. 3 to 5 are illustrative views showing an example of an apparatus for manufacturing a laminate 30 used in an embodiment of this invention. This laminate 30 has a first release layer 22 , an easily broken layer 20 , and a second release layer 1 on the main surface of the surface material 24 .
8 and the covering layer 16 are laminated in that order. The apparatus 100 includes a holding roller 102 for holding the surface material 24a forming the strip-shaped surface material 24 in a roll shape. One end of the surface material 24a held by the holding roller 102 is unraveled,
It is guided to a release agent application device 104. The release agent application device 104 is for printing and applying a release agent 22a such as silicone resin, fluororesin, paraffin, wax, etc. on one surface of the surface material 24a, and includes two rollers 106a and 106b. , and a storage tank 108, and the release agent 22a is applied while rotating the rollers 106a and 106b. Note that the release agent coating device 104
As a coating device, a coating device such as a gravure roll coater or a reverse roll coater may be used, or a known printing machine such as an offset printing machine or a screen printing machine may be used. This release agent 22a is then led to a dryer 109 that includes a heater and is dried. In the dryer 110, the release agent 22a printed and coated on the surface material 24a is dried to form the first release layer 22. The surface material 24a on which the first peeling layer 22 has been formed in this manner is guided to the winding device 112. The surface material 24a coated with the release agent 22a in this manner is then sent to a lamination device 120 where the easily breakable layer 20 is formed. The laminating apparatus 120 may be, for example, a semi-continuous vacuum evaporation apparatus having a structure in which both a batch type and a continuous winding type are used. The structure of this device can be roughly divided from the functional point of view: a vacuum tank 122, a winding shaft 12 in an upper chamber 124;
6, an internal device including a delivery shaft 128 and a cooling drum 130, an evaporation source 134 and a heating device in a lower chamber 132, a vacuum exhaust system 136, and various other instruments. With this semi-continuous vacuum evaporation device, the delivery shaft 1
The surface material 24a fed out from the cooling drum 130 passes through the slit and enters the lower chamber 132.
Aluminum, silver,
The easily broken layer 20 is formed by vacuum evaporating zinc, other metals, or metal compounds as evaporation substances.
Incidentally, the surface material 24a is placed in the upper chamber 124 again after vapor deposition.
, and is wound up on the winding shaft 126. Other examples of the laminating apparatus include, for example, a printing apparatus such as an offset printing machine and a coating apparatus as shown in FIG. The laminating device 220 shown in FIG. 8 is for printing and applying the easily breakable material 20a forming the easily breakable layer 20 on the surface of the first peeling layer 22 formed on the surface of the surface material 24. , main roller 222a
and a roller 222b provided opposite to the main roller 222a. The lower part of the main roller 222a is immersed in the easily broken material 20a stored in the storage tank 224.
2b and the roller 222b, the roller 22
In step 2b, the easily broken material 20a is printed and applied. As this easily destructible material 20a, as described above,
Examples include inks such as UV type ink and resins such as synthetic resins containing metal powder. Then, the surface material 24a on which the easily destructible material 20a is printed and applied is transferred to a dryer 24 including a heater, for example.
6. In the dryer 226, the surface material 24
The easily destructible material 20a printed and coated on the layer a is dried to form the easily destructible layer 20, and then wound around the take-up roller 228. The rolled body of the surface material 24 on which the easily broken layer 20 is formed is sent to a laminating device 140 shown in FIG. 5. The laminating apparatus 140 shown in FIG.
It includes a device 142 for loading 4 rolls. The surface material 24 pulled out from the roll body loading device 142 that loads this roll body is transferred to the next release agent coating device 144.
guided by. The release agent coating device 144 coats one surface of the easily broken layer 20 with silicone resin, for example.
It is for printing and applying a release agent 18a such as fluororesin, paraffin, wax, etc., and includes two rollers 146a and 146b and a storage tank 148, and the release agent 18a is applied while rotating the rollers 146a and 146b. This release agent 18a
is then led to a dryer 149 that includes a heater and is dried. Note that the release agent coating device 1
As 44, a coating device such as a gravure roll coater or a reverse roll coater may be used, or a known printing machine such as an offset printing machine or a screen printing machine may be used. Release agent 18a forming this second release layer 18
is partially printed and applied on the surface of the easily broken layer 20, and is formed by pattern printing lines such as "opened", for example. The surface material 24 coated with the release agent 18a is sent to a lamination device 150 that laminates the coating material 16a that forms the next coating layer 16. This coating material laminating device 150 includes a roller 152 that applies a coating material 16a such as EVA resin. In this laminating device 150, the coating material 16a is coated on the surface of the easily breakable layer 20 coated with the release agent 18a forming the second release layer 18 while being pressed by the roller 154, and is melted. Cooler 1 installed next in the state
56. The cooler 156 is for cooling the covering material 16a. In the cooler 156, the coating material 16a is cooled and solidified to form the coating layer 16,
A laminate 30 is formed on the main surface of the surface material 24 by sequentially laminating the first release layer 22, the easily broken layer 20, the second release layer 18, and the covering layer 16. This laminate 30 is wound up on a winding roller 158. The laminate 30 thus formed is then loaded into a laminator 160 shown in FIG. 6. FIG. 6 is an illustrative view showing a laminating apparatus 160 that laminates the adhesive layer 14 on the laminate 30. This laminating device 160 includes a roll loading device 162 for loading rolls of the laminate 30, and a release sheet 1.
It includes a roll body loading device 164 for loading two roll bodies. The release sheet 12 pulled out from the roll loading device 164 of the release sheet 12 has its release agent layer 12a surface as the lower surface in FIG.
The adhesive coating device 166 is the coating device No. 4. In this adhesive application device 166, an adhesive such as a pressure-sensitive adhesive is printed and applied. This adhesive applicator 166 uses the release sheet 12
The main roller 168a is for applying the adhesive 14a to the surface of the release agent layer 12a.
and a roller 168b provided opposite to the main roller 168a. The lower part of the main roller 168a is immersed in the adhesive 14a stored in the storage tank 170, and the surface of the release agent layer 12a of the release sheet 12 sandwiched between the main roller 168a and the roller 168b is The adhesive 14a is printed and applied by the main roller 168a. Then, the release sheet 12 on which the adhesive 14a is printed and applied is transferred to a dryer 172 including a heater, for example.
guided by. In the dryer 172, the release sheet 12
The printed adhesive 14a is dried to form the adhesive layer 14, and the laminate of the adhesive layer 14 and release sheet 12 is led to a laminating device 174 with a separately prepared laminate 30. The stacking device 174 for the laminate 30 includes a roll loading device 162 for loading rolls of the laminate 30 . Laminated body 30 led out from this roll loading device 162
is guided between two rollers 176a and 176b, and overlapped with the surface of the adhesive layer 14 formed on the surface of the release sheet 12 and the surface of the laminate 30 on the coating layer 16 side, and the two rollers 176a and 176b are pressed together by the adhesive force of the adhesive layer 14, and are wound up on the winding roller 178 in the overlapping state. In order to form sealing pieces using the adhesive material manufactured in this way, it is sufficient to load it into an apparatus for manufacturing sealing pieces, including a printing device for this laminate. FIG. 7 is an illustrative view showing an example of an apparatus for manufacturing sealing pieces. The sealing piece manufacturing apparatus 180 includes a holding device 182 that loads a roll of a laminate 30 in which a release sheet 12 is laminated on the surface of an adhesive layer 14.
The laminate consisting of the release sheet 12 and the laminate 30 pulled out from the holding device 182 is guided to the printing device 184. This printing device 184 is comprised of a known printing machine such as an offset printing machine. Then, the printing device 184 forms a printing layer 26 on the surface of the surface material 24, on which lines such as "product name" are printed, for example. The laminate on which the printed layer 26 has been formed in this manner is guided to a die cutter 186. The die cutter 186 includes a so-called die cutter having a cutting blade, and uses the die cutter to cut the surface material 24, the first peeling layer 22,
Cuts of appropriate shapes are made in the easily broken layer 20, the covering layer 16, and the adhesive layer 14. Note that the die cutting machine 186 is a roll with a cutting blade,
A so-called die roll may be used. The cut laminate is separated into an unnecessary portion and a sealing piece 10 (necessary portion) by rollers 188a and 188b, and the unnecessary portion is wound up into a roll by a scrap removal roller 190 and sealed. The piece 10 (required portion) is temporarily attached to the release sheet 12 and is wound up into a roll by a winding roller 192. Note that a score forming machine may be provided in place of the die cutting machine 186 and the winding roller 192. The scoring machine includes a cutting blade. This cutting blade is used to make cuts in the surface material 24, the first peeling layer 22, the easily broken layer 20, the covering layer 16, and the adhesive layer 14 to form each sealing piece 10. Here, more specifically, it is as follows. (1) A polyethylene terephthalate film with a thickness of approximately 50μ is used as the surface material, and silicone resin is applied to one main surface to form the first peeling layer, and then to form the easy-to-break layer. 1st
Vacuum evaporate aluminum onto the release layer of approx.
An easily broken layer of 7μ was formed. Furthermore, on the surface of the easily breakable layer formed by vacuum-depositing aluminum, a silicone resin manufactured by Toray Industries, Inc., which has a lower peeling force than the silicone resin forming the first peeling layer, is applied to a dry film thickness of 0.1 to
A second release layer is formed by part-coating to a thickness of 5μ. On top of that, the EVA listed in Table-1 below
A coating layer is formed by coating a synthetic resin whose main component is resin to a thickness of about 5 to 50 microns.
Thereafter, an acrylic adhesive (BPS-5127) manufactured by Toyo Ink was coated to a dry film thickness of 5 to 50 μm to form an adhesive layer. At this time, the adhesive force a between the first release layer and the easily broken layer is
is approximately 50 g, the adhesive force b between the second release layer and the coating layer is approximately 30 g, and the adhesive force d of the adhesive layer is approximately 50 g.
was approximately 1000 g, and the force c required to peel the release sheet from the adhesive layer was approximately 20 g. The thus constituted pressure-sensitive adhesive material was formed into a sealing piece and pasted on a material to be pasted (paper box, etc.). At this time, the adhesive force d to the adhered material and the adhesive force d' between the coating layer and the adhesive layer were about 1000 g. When an attempt was made to forcefully peel off the pasted sealing piece from the material to which it was pasted, the easily broken layer was torn at the border between the part where the second peeling layer was formed and the part where the second peeling layer was not formed. At the release layer site, the torn easily broken layer was peeled off from the adhered material together with the surface material.

[Table] (2) A polyester film with a thickness of about 50μ is used as the surface material, and silicone resin is applied to one main surface to form the first release layer, and then to form the easily broken layer. , on top of this first release layer
A printing layer was formed using UV ink to form an easily breakable layer of about 7 μm. Furthermore, on the surface of the easily broken layer consisting of this printed layer, a silicone resin made by Toray Industries, Inc., which has a lower peeling force than the silicone resin forming the first peeling layer, is part-coated to a dry film thickness of 0.1 to 5μ. to form a second release layer. Thereon, a synthetic resin containing EVA resin as a main component is coated to a thickness of about 5 to 50 microns to form a coating layer. After that, apply Toyo Ink's acrylic adhesive (BPS-5127) to a dry film thickness of 5.
An adhesive layer was formed by coating to a thickness of ~50μ. At this time, the adhesive force a between the first release layer and the easily broken layer is about 50 g, the adhesive force b between the second release layer and the coating layer is about 30 g, and the adhesive force d of the adhesive layer is approximately 1000g, and the force c required to peel the release sheet from the adhesive layer is approximately 20g.
It was hot at g. The thus constituted pressure-sensitive adhesive material was formed into a sealing piece and pasted on a material to be pasted (paper box, etc.). At this time, the adhesive force d to the adhered material and the adhesive force d' between the coating layer and the adhesive layer were about 1000 g. When an attempt was made to forcefully peel off the pasted sealing piece from the material to which it was pasted, the easily broken layer was torn at the border between the part where the second peeling layer was formed and the part where the second peeling layer was not formed. At the release layer site, the torn easily broken layer was peeled off from the adhered material together with the surface material.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a sealing piece that is an embodiment of this invention. FIG. 2 is a sectional view showing the destroyed state of the embodiment. FIGS. 3 to 5 are illustrative views showing an example of an apparatus for manufacturing a laminate used in an embodiment of this invention. FIG. 6 is an illustrative view showing an example of an apparatus for manufacturing a laminate used in an embodiment of this invention. FIG. 7 is an illustrative view showing an example of an apparatus for manufacturing sealing pieces. FIG. 8 is an illustrative view showing another method of forming an easily broken layer. FIG. 9 is a perspective view showing how to use the embodiment. In the figure, 10 is a sealing piece, 12 is a release sheet, 14 is an adhesive layer, 16 is a coating layer, 18 is a second release layer, 20 is an easily broken layer, 22 is a first release layer,
24 is a surface material, 26 is a printing layer, 14a is an adhesive,
16a is a coating material, 18a is a release agent, 20a is an easily broken material, 22a is a release agent, 24a is a surface material, 10
0 is a device, 102 is a holding roller, 104 is a release agent coating device, 106a, 106b are rollers, 108
1 is a storage tank, 110 is a dryer, 120 is a stacking device, 1
22 is a vacuum tank, 124 is an upper chamber, 126 is a winding shaft, 128 is a delivery shaft, 130 is a cooling drum, 1
32 is a lower chamber, 134 is an evaporation source, 136 is a vacuum exhaust system, 140 is a lamination device, 142 is a roll loading device, 144 is a release agent coating device, 150 is a lamination device, 152 is a roller, 154 is a roller, 156 is a Cooler, 158 is a winding roller, 160 is a laminating device, 162, 164 is a roll loading device, 166 is an adhesive coating device, 168a, 168b are rollers,
170 is a storage tank, 172 is a dryer, 174 is a laminating device, 176a, 176b are rollers, 178 is a winding roller, 220 is a laminating device, 222a is a main roller, 222b is a roller, 224 is a storage tank, 22
6 is a dryer, 228 is a winding roller, and A is a material to be adhered.

Claims (1)

[Claims for Utility Model Registration] 1. A surface material, an easily broken layer laminated on one main surface of the surface material, a first release layer that facilitates peeling between the surface material and the easily broken layer, a second release layer formed on a part of the main surface of the easily broken layer; a coating layer formed on the second release layer side main surface of the easily broken layer; and a main surface of the coating layer. When the adhesive force between the first release layer and the easily broken layer including the adhesive layer formed on the surface is a, and the adhesive force between the second release layer and the coating layer is b, the following formula a> A sealing piece that satisfies b. 2. The sealing piece according to claim 1, wherein the surface material includes a synthetic resin film. 3. The sealing piece according to claim 2, wherein the surface material includes a transparent synthetic resin film. 4. The surface material includes polyethylene terephthalate film, as claimed in Claim 2 of Utility Model Registration.
The sealing piece described in Section 3 or Section 3. 5. The sealing piece according to any one of claims 1 to 4, wherein the first release layer includes a release agent layer coated with silicone resin. 6. The sealing piece according to any one of claims 1 to 4, wherein the first release layer includes a release agent layer coated with fluororesin. 7. The sealing piece according to any one of claims 1 to 6, wherein the easily broken layer includes a vapor-deposited layer. 8. The sealing piece according to claim 7, wherein the easily broken layer includes a metal vapor deposited layer. 9 The easily breakable layer includes a vapor deposited layer formed by vapor depositing aluminum, as claimed in claim 8 of the utility model registration.
The sealing piece mentioned in section. 10. The sealing piece according to claim 8, wherein the easily broken layer includes a vapor-deposited layer formed by vapor-depositing silver. 11. The sealing piece according to any one of claims 1 to 6, wherein the easily broken layer includes a printed layer. 12. The sealing piece according to claim 11, wherein the easily broken layer includes a silver printing layer. 13. The sealing piece according to any one of claims 1 to 12, wherein the second release layer includes a release agent layer coated with silicone resin. 14. The sealing piece according to any one of claims 1 to 12, wherein the second release layer includes a release agent layer coated with fluororesin. 15. The sealing piece according to any one of claims 1 to 14, wherein the coating layer includes a resin layer coated with a synthetic resin. 16 The coating layer includes a resin layer coated with a synthetic resin containing EVA resin as a main component,
The sealing piece described in claim 15 of the utility model registration claim. 17. The sealing piece according to any one of claims 1 to 16, wherein the adhesive layer includes a pressure-sensitive adhesive layer.