JP4422285B2 - Sealed package - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a package used for packaging a blood glucose level measurement sensor or the like. More particularly, the present invention relates to a package that is easy to open and can easily confirm the fact that sealing has been achieved.
[0002]
[Prior art]
1 and 2 are plan views showing a package 1 of a conventionally known blood glucose level measuring sensor. The packaging body 1 has a flat and rectangular shape in which an elongated flat plate blood glucose level measurement sensor 11 is sandwiched between two opposing sheet walls 1a and 1b. The two sheet walls 1a and 1b are connected to each other by a thermal bonding portion 2 surrounding the blood glucose level measuring sensor 11. Further, a part 2a of the heat bonding part 2 extends toward the inside of the package, and divides the internal space of the package 1 into two small rooms communicating with each other. The blood glucose level measuring sensor 11 is accommodated in the larger small room, and the desiccant 12 such as silica gel is accommodated in the smaller small room.
[0003]
The blood glucose level measurement sensor 11 is used as follows. That is, by pulling the unbonded portion 5 provided in the right region in FIGS. 1 and 2 by hand, a part of the package 1 is opened to expose a part of the sensor 11, and the blood to be measured is placed there. After adhering, the sensor is set in a measuring device (not shown) and the blood glucose level is measured.
[0004]
Such a package 1 has a problem that a considerable force is required at the time of opening since a sealing layer of a thermoplastic resin is provided on both the sheet walls 1a and 1b to be bonded to each other. There is a package that weakens the adhesive strength of the adhesive portion to facilitate opening, but in that case, a new problem arises that the reliability of sealing is reduced.
[0005]
[Problems to be solved by the invention]
Therefore, a technical problem to be solved by the present invention is to provide a package that can be easily opened with a relatively small force and can be easily inspected as to whether or not a reliable sealing is achieved.
[0006]
[Means for Solving the Problems]
The present invention has been made in order to effectively solve the above problems, and provides a package having the following characteristics.
[0007]
That is, the packaging body of the present invention is a sealed packaging body in which the first and second sheet walls facing each other are provided with a sealed accommodation space therebetween and thermally bonded to each other. And the easy peeling layer is provided only in the inner surface of one sheet | seat wall. The easily peelable layer present in the heat bonding region on the inner surface of the sheet wall is the other sheet wall (30) when the heat bonding is good when both the sheet walls are peeled off due to good or bad heat bonding. When the thermal transfer is poor, the portion transferred to the inner surface is caused to be transferred to the inner surface of the other sheet wall (30) . As a result, the quality of the sealing in the thermal bonding region can be confirmed after peeling both the sheet walls by the contrast between the “base material layer of the other sheet wall” and the “easy peeling layer transferred thereto”.
[0008]
In the package having the above structure, the force required at the time of opening is naturally reduced due to the presence of the easily peelable layer, but in addition, since the easily peelable layer is provided only on one sheet wall, It can be easily confirmed visually that the package has been securely sealed at least in the initial stage of manufacture. That is, about the area | region where thermal bonding was achieved, an easily peelable layer is transcribe | transferred to the sheet | seat wall of the other side by peeling it off. On the contrary, if there is a poorly bonded portion in the heat bonding region, the easy peeling layer is not transferred to that portion. And sealing can be easily confirmed by selecting appropriately the material used for an easy peeling layer and a base material layer so that "the presence or absence of the transfer" can be confirmed by visual contrast observation. Further, such a configuration has an advantage that the cost can be reduced as compared with the case where the easy peeling layer is provided on both of the sheet walls.
[0009]
In the present invention, the material used for the easily peelable layer and the base material layer is not particularly limited as long as the presence or absence of the transfer can be confirmed by visual contrast observation. It is preferable to employ a “white easy peeling layer” and a “metallic substrate layer” and use the contrast.
[0010]
In this case, the first sheet wall is made of “a base material layer having a metal thin film layer on the inner surface side” and “a transparent olefin resin layer such as a low density polyethylene resin laminated on the inner surface side of the base material layer”. Constitute. The second sheet wall is formed by laminating a white easy release layer on the inner surface side of the olefin-based resin layer of the sheet wall having the same configuration as the first sheet wall. In this case, the easy release layer preferably contains a modified olefin resin composed of an olefin resin and a vinyl monomer, and more specifically 55 to 75% by weight of the olefin resin. What contains the modified olefin resin obtained by graft-polymerizing 45-25 weight% of styrene monomers is preferable. When an easily peelable layer containing this modified olefin resin is employed, there is an advantage that a sealed package can be manufactured by thermally bonding both sheet walls at a low temperature and at a high speed.
[0011]
In addition, as said metal thin film layer, "aluminum foil or an aluminum vapor deposition thin film" can be considered. Further, as the base material layer, a colored layer colored in a desired color may be adopted instead of the material having a metal color.
[0012]
In the said structure, an olefin resin layer will exist between an easily peelable layer and a base material layer. This olefin-based resin layer is necessary to maintain the adhesion with the easy-peeling layer, but since this layer is transparent as described above, the contrast between the easy-peeling layer and the base material layer. Will not be damaged.
[0013]
In the package of the present invention, since it is possible to easily confirm visually whether or not complete sealing without “omission” has been achieved over the entire circumference of the package at least in the initial stage of manufacture, the reliability for sealing is improved. Sampling inspection before shipment can be performed easily and quickly. In addition, in this invention, although the force required at the time of opening is reduced by providing an easily peelable layer, it is preferable that the opening strength is 300-800 g / 15mm.
[0014]
In addition, by adopting a configuration in which a narrow hot press part is formed along the outer peripheral edge of the heat bonded region of the hermetic package, and the thickness of the easy peeling layer in the hot press part is reduced, Since moisture absorption through the cross section of the release layer can be reduced, a sealed package with higher moisture resistance can be obtained.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A package according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 3 is a plan view showing the packaging body 20 of the present invention and corresponds to FIG. The packaging body of the present invention is characterized by the layer structure of the sheet wall constituting the packaging body, and the arrangement position of the heat bonding region is not particularly limited. Therefore, FIG. 3 is not different from FIG.
[0016]
FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 3 and shows the layer structure of the first sheet wall 30 and the second sheet wall 40 constituting the package 20. FIG. 4A shows a state where both the sheet walls are thermally bonded, and FIG. 4B shows a state after the both sheet walls are peeled off from each other. The first sheet wall 30 located on the lower side in the figure is configured by laminating an olefin-based resin layer 33 on the inner surface side (side located inside the package) of the base material layer 35. The second sheet wall 40 has a configuration in which an easily peelable layer 48 is added to the sheet wall having the same configuration as the first sheet wall 30. Since the olefin resin layer 33 itself also has adhesiveness, the first sheet wall 30 that does not have the easily peelable layer 48 can be thermally bonded to form a package. Such a package is conventionally known, but as already described, a large force is required at the time of opening. In this invention, the force required at the time of opening is made small by providing an easily peelable layer. This is known per se, but in the present invention it does not stop there, this easy peel layer is provided only on one sheet wall, and by appropriately selecting the material of the easy peel layer and the base material layer, The seal can be confirmed by visual contrast observation.
[0017]
The first sheet wall 30 and the second sheet wall 40 are connected to each other only in the thermal bonding region 21. When the first and second sheet walls connected to each other are peeled off, the easily peelable layer 48 present in the heat bonding region 21 causes cohesive failure, and a part 48a thereof is on the olefin resin layer 33 of the first sheet wall. (See FIG. 4B). That is, at least in the initial stage, the region that has been reliably thermally bonded is peeled off to transfer the easily peelable layer 48 to the other sheet wall. In other words, if there is a poorly bonded portion in the thermal bonding region 21, the easily peelable layer 48 is not transferred to that portion. In the present invention, by utilizing the contrast between the base material layer 35 and the easy peeling layer 48, the presence or absence of this transfer can be easily confirmed visually.
[0018]
That is, after the first and second sheet walls 30 and 40 are peeled apart from each other, only the portion on the surface of the olefin resin layer 33 of the first sheet wall 30 where thermal bonding has been achieved is easily peeled off. Layer 48a will be transferred. Therefore, when the transfer is confirmed over the entire heat bonding region 21 shown in FIG. 3, it can be confirmed that the package has been completely sealed. The olefin resin layer 33 is present between the easily peelable layer 48a and the base material layer 35. Since the olefin resin layer is transparent, the easy peel layer 48a and the base material layer 35 It does not affect the contrast between. The olefin-based resin layer 33 is provided in order to ensure the adhesiveness of the easily peelable layer 48.
[0019]
In the present invention, the material of the base material layer and the easily peelable layer is not particularly limited as long as the presence of the easily peelable layer can be visually confirmed using the contrast between them. However, it has been found that a modified olefin polymer as disclosed in JP-A-10-202810 (Mitsubishi Chemical Corporation) is extremely preferable as an easy release layer used in the present invention. The reason why these modified olefin resins are particularly suitable for the present invention is that the resin exhibits a white color, so that the contrast to the metal color is clear, easy peelability (peelable characteristics), and heat resistance against heat seal temperature fluctuations. This is because the stability of the seal strength is excellent.
[0020]
The easily peelable layer containing the modified olefin resin is advantageous in that the fluctuation of the heat seal strength is slight with respect to the fluctuation of the heating temperature (heat sealing temperature) at the time of heat fusion by the seal bar. It has characteristics. FIG. 5 illustrates this advantageous characteristic. In the figure, the broken line A shows the heat seal characteristics of the easy-release layer, and the broken line B shows the heat seal characteristics of the release layer composed of an unmodified ethylene vinyl acetate copolymer (EVA). In the broken line B, the seal strength rapidly increases as the heat seal temperature rises. To obtain a certain seal strength, it is necessary to keep the seal temperature constant. On the other hand, the easily peelable layer containing the modified olefin resin has a wide heat seal temperature range corresponding to the required seal strength, and a certain seal against the fluctuation of the heat seal temperature. Strength can be obtained. Note that the heat seal strength on the vertical axis of this graph is indicated by the maximum load required to take a strip-like sample with a width of 15 mm for the heat seal layer and peel it off at a speed of 300 mm / min.
[0021]
The modified olefin polymer employed in the present invention is formed from an olefin resin and a vinyl monomer. Specifically, the olefin resin is 20 to 80% by weight, preferably 55 to 75%. % By weight and 80 to 20% by weight, preferably 45 to 25% by weight of vinyl monomer, are obtained by subjecting to graft reaction conditions. If the vinyl monomer exceeds 80% by weight, the seal strength becomes weak and the required seal strength cannot be obtained. If the olefin resin exceeds 80% by weight, the seal strength becomes strong and easy to open. In addition, a thread pulling phenomenon of the release layer at the time of opening, that is, a phenomenon in which the release layer is pulled into a thread shape at the time of opening and is broken and deteriorates in appearance, which adversely affects the removal of the contents. In addition, the olefin resin content in the modified olefin polymer-containing resin composition is 55 to 75% by weight, and the vinyl monomer content is 45 to 25% by weight. And easy opening properties can be obtained. Further, this modified olefin polymer is diluted with an unmodified olefin polymer so that the vinyl monomer content is 20% by weight or more, preferably 25% by weight or more, particularly preferably 35% by weight or more. It may be a thing.
[0022]
Examples of the olefin resin used for producing the modified polyolefin resin include ethylene, propylene, 1-butene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, and 1-heptene. A homopolymer of olefins such as 1-octene having 2 to 12 carbon atoms, preferably about 2 to 8 or a copolymer of two or more of the above olefins, or the above olefin and non-conjugated diene, vinyl ester, unsaturated organic Examples thereof include an acid or a derivative thereof, a copolymer with vinyl organosilane, and the like. These copolymers may be in any bonding mode of random, block, or graft, and may be resinous or elastomeric. These olefin polymers can be used in combination of two or more.
[0023]
Specific examples of the olefin resin include high density, medium density, low density and linear low density polyethylene, polypropylene, poly-1-butene, poly-1-hexene, poly (3-methyl-1-butene), poly ( 4-methyl-1-pentene), poly-1-heptene, poly-1-octene, ethylene / propylene copolymer (random, block), ethylene / 1-butene copolymer, ethylene / 1-hexene copolymer, ethylene・ 1-octene copolymer, ethylene / propylene / 1-butene random copolymer, ethylene / non-conjugated diene copolymer, ethylene / propylene / non-conjugated diene copolymer (specific examples of non-conjugated diene include di- Cyclopentadiene, 1,4-hexadiene, 5-methyl-1,4-hexadiene, 7-methyl-1,6-octadiene, 1,9-decadiene, etc.), ethylene / acetic acid Vinyl copolymer, ethylene / vinyltrimethoxysilane copolymer, maleic anhydride grafted polyethylene, ethylene / methyl acrylate copolymer, ethylene / ethyl acrylate copolymer, ethylene / methyl methacrylate copolymer, ethylene / Typical examples include acrylic acid copolymers, ethylene / methacrylic acid copolymers, ethylene / acrylic acid / methyl acrylate copolymers, ethylene / methacrylic acid / methyl methacrylate copolymers, and the like. Among these, polyethylene such as low density polyethylene, polypropylene, and ethylene / propylene copolymer are preferably used from the viewpoint of thermal stability.
[0024]
The vinyl monomer used for producing the modified polyolefin resin is not particularly limited, and specifically, styrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, Unsaturated aromatic monomers such as dimethylstyrene and chlorostyrene; vinyl esters such as vinyl acetate and vinyl propionate, methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, sec-butyl acrylate, dodecyl acrylate, 2 -Acrylic esters such as ethyl hexyl acrylate, hexyl acrylate, octyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, sec-butyl methacrylate, decyl methacrylate, 2-ethylhexyl methacrylate Methacrylic acid esters such as glycidyl methacrylate; Unsaturated organic acids such as acrylic acid, methacrylic acid, maleic anhydride, dimethyl maleate, and di (2-ethylhexyl) maleate; Unsaturated nitriles such as acrylonitrile and methacrylonitrile An unsaturated mono- or dihalide such as vinyl chloride or vinylidene chloride; Of these, unsaturated aromatic monomers and methacrylic acid esters are preferably used, and styrene and methyl methacrylate are particularly preferably used from the viewpoint of easy modification.
[0025]
As the olefin resin used for the olefin resin layers 33 and 43 laminated on the inner surface side of each sheet wall 30 and 40, high density, medium density, low density and linear low density polyethylene, polypropylene, poly-1- Butene, poly-1-hexene, poly (3-methyl-1-butene), poly (4-methyl-1-pentene), poly-1-heptene, poly-1-octene, ethylene / propylene copolymer (random, block) , Ethylene / 1-butene copolymer, ethylene / 1-hexene copolymer, ethylene / 1-octene copolymer, ethylene / propylene / 1-butene random copolymer, ethylene / non-conjugated diene copolymer, ethylene・ Propylene / non-conjugated diene copolymer (specific examples of non-conjugated dienes include dicyclopentadiene, 1,4-hexadiene, 5-methyl-1,4-hexadiene, 7-methyl-1,6-octadiene) 1,9-decadiene, etc.), ethylene / vinyl acetate copolymer, ethylene / vinyltrimethoxysilane copolymer, maleic anhydride grafted polyethylene, ethylene / methyl acrylate copolymer, ethylene Ethyl acrylate copolymer, ethylene / methyl methacrylate copolymer, ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, ethylene / acrylic acid / methyl acrylate copolymer, ethylene / methacrylic acid / methacrylic acid Examples thereof include an acid methyl copolymer. Among these, low density polyethylene and linear low density polyethylene are preferable because they have good heat sealability at low temperatures.
[0026]
In addition, when the sensor for blood glucose level measurement etc. which are easy to be influenced by moisture are accommodated in the sealed package of the present invention, the package itself may be required to have extremely high moisture resistance. Therefore, in the sealed package of the present invention, the olefin resin laminated on the inner surface side of each base material layer of the first sheet wall and the second sheet wall has a low density of 0.925 to 0.930 (g / cm ³ ). Polyethylene, linear low density polyethylene alone or a laminate containing these resins is preferred. In addition, as a laminated body of a low density polyethylene and a linear low density polyethylene, the thing of a 2 layer or 3 layer structure can be mentioned.
[0027]
Examples of the metal thin film layer included in the base material layer of each sheet wall 30 and 40 may include a biaxially stretched film such as aluminum foil, biaxially stretched polypropylene, and biaxially stretched polyethylene terephthalate deposited with aluminum. .
[0028]
The easily peelable layer 48 of the package shown in FIGS. 3 and 4 contains such a modified olefin resin layer. The layer structure of each sheet wall 30, 40 will be described in more detail below.
[0029]
In this case, the base material layer 35 of the first sheet wall 30 is composed of a printing layer 31 and an aluminum layer 32 whose outer surfaces are coated with polyethylene terephthalate. Therefore, the sealing can be confirmed by the contrast between the metal color of the aluminum layer 32 and the white color of the easy peeling layer 48. In this embodiment, the second sheet wall 40 is obtained by adding an easily peelable layer 48 to the sheet wall having the same configuration as the first sheet wall 30. That is, the second sheet wall 40 is constructed by laminating an olefin resin layer 43 on the inner surface side of a base material layer 45 composed of a printed layer 41 and an aluminum layer 42, and further laminating an easily peelable layer 48 on the inner surface side. Has been. However, as can be seen from the above description, since the aluminum layer used for obtaining the contrast with the easy peeling layer 48 is only the aluminum layer 32 provided on the first sheet wall 30 side, in that sense, The aluminum layer 42 on the second sheet wall 40 side is not always necessary.
[0030]
The aluminum layer in each sheet wall plays an important function not only for obtaining contrast but also for improving the moisture resistance of the package. At least the aluminum layer 42 on the second sheet 40 side is equivalent for the above reason. It is possible to substitute other materials that can ensure moisture resistance.
[0031]
6 (a) and 6 (b) are schematic diagrams for explaining confirmation of the presence / absence of the transfer (conformity of thermal bonding) using the contrast, and the second figure after peeling from the second sheet wall 40. FIG. One sheet wall inner surface is shown. FIG. 6 (a) shows the case where it was confirmed that the thermal bonding was good, and FIG. 6 (b) shows the case where it was confirmed that a part of the thermal bonding area had been detached. Yes.
[0032]
In FIG. 6, the hatched area is the aluminum layer 35 observed through the transparent olefin resin layer 33 (see FIG. 4). The oblique line represents the metal color of the aluminum layer. In FIG. 6 (a), the white easily peelable layer 48a is transferred to the entire region corresponding to the heat bonding region 21 in FIG. 3, and the heat bonding is completely performed (the sealing is completely performed). It was done). The fact that “the easy peelable layer is transferred to the entire region” can be easily confirmed visually by the contrast between the “metal color of the aluminum layer 35” and the “transferred white easy peelable layer 48a”.
[0033]
On the other hand, FIG. 6B shows a case where a part 49 of the thermal bonding region 21 has a gap 49 and the thermal bonding is not complete. In this case, since the easy peelable layer is not transferred at the position corresponding to the gap 49, the white easy peelable layer 48a is cut at that portion, and there is a metal color existing therebelow. The aluminum layer 35 can be easily confirmed visually.
[0034]
As described above, in the package of the present invention, since it is possible to easily confirm visually whether or not complete sealing without “missing” has been achieved over the entire circumference of the package at least in the initial stage of manufacture, Inspection can be performed easily and quickly. As already described, the heat seal strength of the easily peelable layer 48 can be changed by changing the proportion of the vinyl monomer added to the modified olefin resin layer, but the opening strength is 300 to 800 g. It is preferable to set it to be / 15 mm. In addition, in order to give strength and puncture resistance of the package itself, biaxially stretched polyethylene terephthalate, biaxially stretched nylon, biaxially stretched polypropylene, etc. are laminated on the outer surface of the olefin resin layer of the first and second sheet walls. If higher moisture resistance is required, a vapor deposition layer made of a metal such as aluminum or a vapor deposition layer made of a metal oxide such as silicon oxide or aluminum oxide may be formed on the inner surface thereof. It is.
[0035]
As described above, the seal structure using the easy-release layer employed in the present invention is extremely suitable for application to a hermetic package used for a blood glucose level measurement sensor. There is also a possibility. For example, a packaging container such as cup noodles can be considered as a product that requires good easy peelable layer properties, but in the case of a cup noodle packaging container where there is a situation that requires sealing before shipping. By providing the easily peelable layer on the adhesive surface of either the container body or the sheet lid of the cup, the sealing can be easily confirmed visually as described above.
[0036]
Usually, as a lid for a cup container, a metal color such as an aluminum foil is generally located on the back surface. Therefore, the above easy-release layer is provided on the cup container body side, and the easy-release layer is a lid. By transferring to the material side, sealing confirmation is performed visually as described above.
[0037]
7 and 8 show another embodiment of the present invention. 7 is a plan view corresponding to FIG. 3, and FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. On the outer peripheral edge of the heat bonding region 21, a hot press portion 22 is provided in which the thickness of the easily peelable layer 48 is reduced by 60 to 70% by hot pressing. By doing so, the moisture absorption through the cross section of the easily peelable layer 21 can be suppressed to 60-70% moisture absorption compared with the case where the hot press part 22 is not formed, and further moisture resistance can be improved. As a method of forming the heat press portion 22, a method of pressing the heat bonding area 21 after forming the heat bonding area 21 with a hot plate having a narrow width along the outer peripheral edge of the heat bonding area 21 or a heat for forming the heat bonding area 21. Examples of the method include heat sealing with a hot plate having a shape in which the outer periphery of the plate is convex with a constant width.
[Brief description of the drawings]
FIG. 1 is a plan view showing a conventional package.
FIG. 2 is a plan view showing a state where the package of FIG. 1 is slightly opened.
FIG. 3 is a plan view showing a package according to an embodiment of the present invention and corresponds to FIG.
4 is a cross-sectional view taken along line 4-4 in FIG.
FIG. 5 is a graph for explaining heat seal characteristics of an easily peelable layer.
FIG. 6 is a schematic diagram illustrating confirmation of the presence or absence of transfer using contrast in the present invention.
FIG. 7 is a plan view showing another embodiment of the present invention and corresponds to FIG.
8 is a cross-sectional view taken along line 8-8 in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Package 2 Thermal bonding area | region 1a, 1b Sheet wall 2 Thermal bonding area | region
11 Blood glucose sensor
12 Desiccant
20 Package
21 Thermal bonding area
22 Heat press
30 1st sheet wall
31 Print layer
32 Aluminum layer
33 Olefin resin layer
35 Base material layer
40 Second sheet wall
41 Print layer
42 Aluminum layer
43 Olefin resin layer
45 Base material layer
48 Easy release layer
49 The part where the omission occurred

Claims (7)

A sealed package formed by heat-bonding opposing first and second sheet walls (30, 40) with a sealed accommodation space therebetween,
The easily peelable layer (48) is provided only on the inner surface of one sheet wall (40), and the easily peelable layer (48a) present in the heat bonding region (21) on the inner surface of the sheet wall has good thermal adhesion, When both sheet walls are peeled off due to defects ,
If thermal bonding is good, the part transferred to the inner surface of the other sheet wall (30),
In the case of poor thermal bonding, each of the other sheet wall (30) causes a portion that is not transferred to the inner surface ,
The contrast between the base material layer (35) of the other sheet wall and the transferred easily peelable layer (48a) can confirm whether the sealing in the thermal bonding region (21) is good or not after the both sheet walls are peeled off. A hermetically sealed package. The first sheet wall (30) is configured by laminating an olefin resin layer (33) on the inner surface side of the base material layer (35),
The second sheet wall (40) is formed by laminating the easy release layer (48) on the olefin resin layer (43) laminated on the inner surface side of the base material layer (45). (48) contains the modified olefin resin comprised from an olefin resin and a vinyl monomer, The sealed package body of Claim 1 characterized by the above-mentioned. The olefin-based resin (33, 43) laminated on the inner surface side of each base material layer (35, 45) is a low-density polyethylene resin,
3. The hermetically sealed package according to claim 2, wherein the modified olefin resin is obtained by graft polymerization of 55 to 75% by weight of an olefin resin and 45 to 25% by weight of a styrene monomer.   The sealed package according to claim 2 or 3, wherein the inner surface of each of the base material layers (35, 45) is composed of a metal thin film layer (32, 42) or a colored layer.   5. The hermetic package according to claim 4, wherein the metal thin film layer is made of an aluminum foil or an aluminum vapor deposited thin film.   The sealed package according to any one of claims 1 to 5, wherein an opening strength is 300 to 800 g / 15 mm.   A heat-pressed portion (22) having a narrow width is formed along the outer peripheral edge of the heat-bonded heat-bonded region (21), and the thickness of the easily peelable layer in the heat-pressed portion is reduced. The sealed packaging body according to any one of claims 1 to 6.

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