JP2001055243A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the amount of water, etc., permeating a hot gluing resin layer at the end face of a hot gluing part as to a packaging form to be formed by hot gluing. SOLUTION: This bag body is a laminated body comprising at least a base layer, a barrier layer and a hot gluing resin layer, or a base layer, a barrier layer, an intermediate layer and a hot gluing resin layer. The hot gluing resin layer forming the laminate body is fitted face to face, and the end part of the outer periphery of its superposed part is provided with a hot gluing part. In this case, the bag body is made, having a hot gluing part expressed in the relation D0<1/2(D+D2), where D1, D2 show the thickness of each hot gluing resin layer and D0 the thickness of the hot gluing part, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A packaging form and a method of forming a packaging requiring a high degree of moisture proof or gas barrier property using various plastic films, plastic films subjected to barrier processing, and composite films laminated with metals and the like. About.

[0002]

2. Description of the Related Art As a package or a housing for foods, pharmaceuticals, chemicals, electric parts and products, precision instruments, etc., a high moisture-proof packaging, in which various gases such as water vapor from the outside do not enter the package or the inside of the housing. Function may be required. In the packaging of pharmaceuticals and foods containing a hygroscopic component, there are many demands. However, the electric parts and the like also require an ultra-high moisture-proof housing. For example, FIG. FIG.
As shown in (b), a housing of the polymer battery 20 (hereinafter, referred to as an exterior body 22) is included. The polymer battery 20 is also referred to as a lithium secondary battery, is referred to as a battery having a polymer electrolyte and generating an electric current by the movement of lithium ions, and includes a battery in which the positive and negative electrode active materials are made of a polymer.

The structure of the lithium battery 20 is such that a positive electrode current collector (aluminum, nickel) / a positive electrode active material layer (metal oxide,
(Consisting of polymer cathode material such as carbon black, metal sulfide, electrolyte, polyacrylonitrile) / Electrolyte layer /
(Consisting of carbonate-based electrolytes such as propylene carbonate, ethylene carbonate, dimethyl carbonate and ethylene methyl carbonate, inorganic solid electrolytes composed of lithium salts, gel electrolytes, etc./anode active material layer (lithium metal,
A polymer negative electrode material such as an alloy, carbon, an electrolytic solution, and polyacrylonitrile / a negative electrode current collector (copper, nickel, stainless steel) or an external electrode (hereinafter referred to as a tab 23);
It consists of an exterior body 22 for packaging them.

[0004] A typical outer package for secondary battery packaging is an outermost layer containing a stretched polyester resin or nylon resin, an aluminum layer having a thickness of 10 to 100 µm, and an olefin or acid-modified olefin. Using a multilayer film containing at least the innermost layer made of resin as a component, as a packaging material, into a bag shape (three-sided seal, four-sided seal, pillow packaging, gusset packaging) or container by heat bonding such as heat sealing The processed one is used.

Further, when the innermost layer is formed into a container or a bag, not only the adhesion between the multilayer films but also the positive electrode and the negative electrode for energizing the electric charge generated by the battery components to the outside. It adheres and adheres to an externally exposed electrode material (hereinafter, tab) connected to the negative electrode current collector, and has a role of maintaining airtightness inside the exterior body. In particular, to prevent the electrolyte of the battery components from causing an exothermic decomposition reaction due to the absorbed moisture, and to prevent the lithium salt in the battery from reacting with the moisture, to generate hydrofluoric acid, thereby forming a barrier layer of the exterior body. The innermost surface may be attacked, resulting in peeling of the adhesive surface. Therefore, a high degree of moisture resistance is also required in this application. FIG. 5 is a diagram schematically showing a system sealed by a barrier packaging material and intrusion of water vapor or the like into the system, (a) is a cross section of the sealing system,
(B) is an enlarged view of a Y part. Generally, the intrusion of a gas such as moisture from the outside in a sealed package is as shown in FIG.
As shown in the following, the following three cases are assumed. Laminated body (exterior body) 3 for sealing contents K that are easily affected by moisture
0 infiltration of water vapor from the unsealed part (W ₂ ) a)
This is a case where the heat-bonded portion penetrates from a pinhole or the like (W ₃ ) and penetrates through the heat-adhesive resin layer from the end face of the seal portion and penetrates into the sealing system (W ₁ ).

[0006] Regarding the permeation from the unsealed portion, the permeation of water vapor can be cut off by selecting the barrier layer in the laminate and setting the thickness of the constituent layers including the barrier layer. Further, pinholes and the like generated in the heat bonding portion can be prevented from being generated by setting sealing conditions. However, in the case where the heat-adhesive resin penetrates and penetrates through the heat-adhesive resin layer from the end face of the seal portion, the heat-adhesive resin has a small amount of moisture permeability, so that water vapor can be sealed for a long time. It is difficult to completely shut off.

[0007] Although the heat-adhesive resin has a small amount of permeation, infiltration of various gases such as water vapor into the sealed system is a problem in long-term storage and use as a sealed system. As described above, since the heat-adhesive resin layer having a cross section formed on the end face of the pouch or the like sealed by the heat sealing method (two layers because of sealing),
After passing through the heat-sealing width of the heat-adhesive resin layer of the heat-sealing portion, water vapor enters the sealing system. As a result, in a polymer battery or the like, as described above, a problem occurs such that the electrolyte component reacts with the infiltrated water to generate hydrofluoric acid.

[0008] The present invention is to provide a packaging form formed by thermal bonding, which can reduce the amount of moisture and the like permeating the thermal adhesive resin layer at the end face of the thermal bonding section. It is.

[0009]

The present invention is a laminate comprising at least a base material layer, a barrier layer and a thermo-adhesive resin layer, wherein the thermo-adhesive resin layers constituting the laminate are stacked facing each other. In addition, in a bag configured by providing a thermal bonding portion at an end around the outer periphery of the overlapped portion, the thicknesses D ₁ and D ₂ of the respective thermal bonding resin layers and the thickness D ₀ of the thermal bonding portion are: It is composed of a packaging bag or at least a base material layer, a barrier layer, an intermediate layer, and a heat-adhesive resin layer, which are provided with a heat-adhesive portion having a relationship of D ₀ <１ ／ (D ₁ + D ₂ ) to form a bag body. In the bag body, which is a laminated body and further has a thermo-adhesive resin layer constituting the laminated body facing each other and superimposed thereon, and a thermo-adhesive portion provided at an end around the outer periphery of the overlapped portion, The thickness D ₁ of the adhesive resin layer,
D ₂ and the thickness D ₀ of the heat-bonded portions, shall apply in packaging bag constituting a _{D 0 <1/2 (D 1 +} D 2) bag provided thermal bonding unit having a relationship, the following respective Invention, that is, the base material layer includes at least one layer of stretched polyester or stretched nylon having a thickness of 6 μm or more, and the barrier layer includes a metal foil, a barrier resin layer, and an inorganic oxide vapor-deposited layer. The layer is a polyester resin having a thickness of 10 μm or more,
At least one layer of a polyolefin-based resin, a nylon-based resin, or a fluorine-based resin, and the heat-adhesive resin layer has a thickness of 20
μm or more, melting point 80 ° or more, Vicat softening point 70 ° or more, consisting of unsaturated carboxylic acid-grafted polyolefin resin containing unsaturated carboxylic acid-grafted polyethylene, unsaturated carboxylic acid-grafted polypropylene, unsaturated carboxylic acid-grafted polymethylpentene That the bag-making form of the bag is one of a three-sided type, a four-sided type, and a pillow type. The bag-making form of the bag is a molded sheet on which a molded portion is formed, and covers the molded sheet. This includes a tray type consisting of a lid material.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A packaging form and a method of forming the same according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing (a) two films to be thermally bonded, showing an example of a packaging form of the present invention, (b) a packaging bag formed by thermal bonding, and an enlarged cross section of X ₁ -X ₁ part. Figure, (d) X
₂ -X ₂ parts is an enlarged cross-sectional view. Figure 2 shows another embodiment of a packaging arrangement of the invention, (a) a perspective view showing the molded sheet and the lid film heat bonding, blister package formed by (b) heat bonding, X ₃ - X ₃ parts enlarged cross-sectional view,
(D) a X ₄ -X ₄ parts enlarged sectional view. FIGS. 3A and 3B are cross-sectional views illustrating an example of the configuration of a stacked body, in which (a) is a cross-sectional view of an example of a three-layered stacked body, and (b) is a cross-sectional view of an example of a four-layered stacked body. FIG.
FIG. 1 is a perspective view showing an example of a polymer battery using a package of the present invention as an outer package. FIG. 5 is a diagram schematically showing a system sealed by a barrier packaging material and intrusion of water vapor or the like into the system, (a) is a cross section of the sealing system,
(B) is an enlarged view of a Y part. 6A and 6B show a bag used for the moisture-proof test of the packaging bag of the present invention, and are (a) a plan view and (b) a cross-sectional view along the line ZZ. FIG. 7 shows an embodiment in which the packaging bag of the present invention is used in a pouch-type packaging form as an outer package of a polymer battery, wherein (a) a three-side seal, (b) a four-side seal, and (d) a pillow pouch. FIG. 9 shows another position where the tab of the polymer battery is taken out of the outer package. FIG. 8 shows an embodiment in which the packaging bag of the present invention is used as an outer package of a polymer battery in an embossing type packaging format, in which (a) a perspective view of a molded sheet and a cross-sectional view along a line XX, and (b). FIG. 4 is a perspective view and a cross-sectional view showing an example of an outer package made of a double-sided molded sheet, and (c) and (d) showing different positions at which tabs are taken out of an embossed type package.

The laminate of the present invention comprises a base material layer / barrier layer / heat-adhesive resin layer or a base material layer / barrier layer / intermediate layer / heat-adhesive resin layer. Each of the tanks needs the following physical properties to be used. The base material layer is basically a resin layer having an insulating property to be in contact with the hardware device. Specifically, a film carrier, and a stretched polyester or a 6 μm-thick or thicker film due to the pinhole property during processing. Stretched nylon films are preferred.

The barrier layer is required to have a high level of barrier properties, and specific examples thereof include a metal foil, a barrier resin layer, and a film on which a metal or inorganic oxide is deposited. As the metal foil, for example, aluminum having a thickness of 15 μm or more and an iron content of 0.5% or more is suitably used. As the barrier film, a vinylidene chloride film, an acrylonitrile film, a fluororesin film, or the like can be used. Alternatively, as a substance having a barrier property, a film in which a metal such as aluminum, aluminum oxide, or silicon oxide, or an inorganic oxide is deposited may be used.

[0013] An intermediate layer may be laminated on the laminate. When the intermediate layer is, for example, an outer package of a polymer battery, the tab and the barrier layer (metal foil) come into contact with each other when the polymer battery main body is housed in the outer package and the periphery thereof is heat-sealed (short circuit occurs). In order to prevent this, it is desirable to include at least one layer of a polyester resin, a polyolefin resin, a nylon resin, or a fluorine resin having a thickness of 10 μm or more. The intermediate layer may be not only a single layer but also a multilayer.

When the heat-adhesive resin layer is used in a polymer battery, the heat-adhesive resin layer has a heat-adhesive property to electrodes (tabs), heat resistance, cold resistance, and the like.
Since processing aptitude (pouching, embossing formability) is required, the thickness is 20 μm or more, the melting point is 80 ° or more, and the Vicat softening point is
It is desirable that the unsaturated carboxylic acid-grafted polyolefin resin containing unsaturated carboxylic acid-grafted polyethylene, unsaturated carboxylic acid-grafted polypropylene, and unsaturated carboxylic acid-grafted polymethylpentene having a temperature of 70 ° or more is used. When the thickness of the heat-adhesive resin layer is less than 20 μm, gaps are formed at both ends of the tabs when the tabs are sandwiched and heat-sealed, and the gaps serve as through pinholes, thereby eliminating barrier properties. Further, when the melting point and the Vicat softening point are low, the heat resistance and the cold resistance are lost, and the heat-adhesive resin layers, and,
There is a possibility that the adhesive strength between the thermo-adhesive resin layer and the tab is reduced and the bag is broken.

Each layer constituting the laminate of the present invention may have, as appropriate, a film-forming property, a laminating process, and a suitability for improving and stabilizing the final product secondary processing (embossing formability, pouching). Surface active / inert treatments such as corona treatment, blast treatment, oxidation treatment, ozone treatment, etc., and moisture absorbing / water absorbing substances such as desiccants, gas blocking / adsorbing substances such as oxygen / nitrogen, flame retardant Substances, carbon, surfactants, inorganic oxides and other antistatic / antistatic substances,
Inorganic, organic,
The metal resin may be added with antioxidants, ultraviolet absorbers, antistatic agents, antiblocking agents, lubricants (fatty acid amides), flame retardants, inorganic and organic metal additives, or liquid coatings.

An example of the case where the laminate is required to have an extremely high moisture-proof property is the above-mentioned outer package of a polymer battery. The following performance is required as the airtightness required for the outer package of the polymer battery. (1) Water vapor permeation rate: 60 ° C, 95%, 350 ppm / 7 days or less per month (2) After filling the electrolyte and storing at 60 ° C for 1 month, the adhesive strength between the layers is 100 g / 15 mm width or more ( 3) Volatility of the electrolyte: 20 mg or less per month at 60 ° C.However, the bonding strength between the layers in (2) above is the bonding surface of the substance generated by the reaction between the electrolyte component and the moisture that enters the inside of the outer package. This is a requirement that the moisture-proof property is not impaired by the peeling off, and is a requirement related to the moisture-proof property as an exterior body. The volatilization amount of the electrolytic solution (3) is to reduce the escape of the components from the inside, and can be expected as an effect of the present invention.

The following factors can be considered as the intrusion of water vapor into the inside of the packaging bag (outer body). (a) Permeation (including pinholes) from the multilayer film itself constituting the exterior body, and intrusion (b) Intrusion from the heat-bonded portion during the heat-bonding processing of the multilayer film Permeation of water vapor caused by (a) above Can be solved by designing the material and thickness of the barrier layer, which is a component of the laminate, to make zero or near zero. However, as for the permeation of water vapor caused by the above (b), permeation and permeation of water vapor into the inside of the packaging bag are inevitable, though a little, as long as the cross section of the heat-adhesive resin is present.

As a result of various studies, the present inventors have made various studies on the improvement of the moisture-proof property in a packaging form which is sealed by heat bonding. As a result, the thickness of the heat-bonded part is made to be 以下 or less of the thickness before sealing. As a result, it has been found that permeation of water vapor from the cross section of the seal can be significantly reduced, and the present invention has been completed.

The specific form of packaging is such that the thickness of the heat-adhesive resin layer of the laminated body constituting the package (in the case of a polymer battery), that is, the innermost resin, is at least the thickness after heat bonding. This is a packaging form in which the thickness of the heat-adhesive resin layers on both surfaces before the heat bonding is 和 of the sum of the thicknesses. Generally, the heat-adhesive resin layers on both surfaces to be heat-bonded are of the same kind and the same thickness. In addition, the permeation of water vapor from the end face is extremely reduced, and the package is close to an ultra-high moisture-proof package.

The amount of water vapor permeated from the end face of the multilayer film is
This is due to the bonding volume of the part to be thermally bonded, particularly the innermost layer. Generally, according to Fick's law, the amount of permeation of a polymer is proportional to its thickness when the water vapor transfer distance is the same, and assuming the above-mentioned bonded portion, if the bonding area is constant, the innermost layer after bonding is The smaller the thickness, the less the transmission of water vapor. Specifically, in the packaging form of sealed package, in the case of bonding processing innermost each other consists packaging material in multilayer films having an innermost layer of thickness D ₀ consisting of the heat-adhesive resin, the adhesive portion The thickness D of the innermost layer is 1 / 2D
₀ > D, and the thermal bonding conditions are such that a thermal bonded portion having a thickness in this range is obtained.

If the heat-adhesive resin (innermost layer) has a fixed thickness, the thickness of the innermost layer after the heat bonding becomes smaller, so that the permeation of water vapor from the end face of the bonded portion becomes smaller,
Moisture entering the exterior body can be reduced. As a result, for example, in the case of an outer package of a polymer battery, an exothermic reaction due to moisture absorption of an electrolyte which is a component of the battery is suppressed, and a stable electromotive force can be continued.

The packaging form of the present invention is realized by a pouch type.
As an example to be applied, as shown in FIG.
The two heat-adhesive resin surfaces face each other and
Are sealed by heat bonding to form a heat bonded portion H
FIG. 1 shows a state before the heat bonding portion is bonded.
As shown in (c), heat before pressurization by the hot plate S for thermal bonding
The thickness of the adhesive resin layer is D₁, D_TwoAnd pa
In our case, usually D ₁= D_TwoIt is. The present invention
In addition, as shown in FIG.
Thickness of the heat-bonded part of the heat-bondable resin₀Is D₀<1/2 (D₁+ D_Two).

Further, as shown in FIG. 2 (a), the packaging form of the present invention comprises a molding sheet 4 in which a storage portion for contents is molded and a lid material 3 having a peripheral edge as shown in FIG. 2 (b). A packaging form called blister type that seals by heat bonding (hereinafter, referred to as a blister type)
Blister packaging etc.). In the blister packaging and the like, the materials of the molded sheet and the lid material are designed in consideration of respective necessary conditions. However, in FIG. 2C illustrated, the configuration of the laminate is assumed to have the same specification, but the thickness of the heat-adhesive resin layer is different. In other words, the thickness of the heat-adhesive resin layer of the lid material is D,
The thickness of the thermo-adhesive resin layer of the molded sheet is D, and the thickness of the thermo-adhesive resin layer of the lid of the molded sheet 4 is particularly thick. The present invention is also applicable to this blister packaging or the like. When the thermal bonding portion H is formed by heat bonding with the lid member 3 at the peripheral flange portion 6 of the molded sheet 4 as shown in FIG. The thickness D ₀ of the heat-bonded portion of the heat-bondable resin welded by the heat bonding is D ₀ <１ ／ (D ₁ + D
₂ ). In the case of this blister packaging or the like, unlike the pouch type, the thickness of the heat-adhesive resin layer of the lid material and the thickness of the heat-adhesive resin layer of the molded sheet are often different. If a heat-bonded portion is formed, the effect can be expected in the same manner as the pouch type.

The following are specific examples of the structure of the laminate used in the present invention. The configurations described below use abbreviations, and the parentheses after each layer indicate the thickness μm of each layer.
(Abbreviation PET: polyester, AL: aluminum, POa: unsaturated carboxylic acid graft polymer, PE: polyethylene,
ON: Stretched nylon, Co-PET: Copolyester, Tr-E
P: acid resistance treatment of metal surface with epoxy resin, Tr-EP-ME: acid resistance treatment of metal surface with epoxy resin and melamine resin, Tr
-EP + POa: Pair treatment of metal surface with blend resin of epoxy resin and unsaturated carboxylic acid graft polymer, D
L: dry lamination, EC: extrusion lamination, TL: thermal lamination, //: co-extrusion] << A >> Example of laminated body composed of dry lamination or extrusion lamination <pouch specifications> PET (12) / DL / ON (15) / DL / AL-Tr-EP (20) / DL / PET (12) / D
L / POa (50) 2. PET (12) / EC / PE (15) / EC / AL-Tr-EP (20) / DL / PET (12) / D
L / POa (50) 3. ON (15) / DL / AL-Tr-EP (20) / DL / PET (12) / DL / POa (50) ON (15) / EC / PE (15) / EC / AL-Tr-EP (20) / DL / PET (12) / DL
/ POa (50) 5. ON (12) / DL / AL-Tr-EP-ME (20) / DL / PET (12) / DL / POa (5
0) 6. ON (12) / DL / AL-Tr-EP + POa (20) / DL / PET (12) / DL / POa
(50) <Emboss specification> Co-PET (16) / DL / ON (15) / DL / AL-Tr-EP (20) / DL / Co-PET
(16) / DL / POa (50) Co-PET (16) / EC / PE (15) / EC / AL-Tr-EP (20) / DL / Co-PET
(16) / DL / POa (50) ON (25) / DL / AL-Tr-EP (40) / DL / Co-PET (16) / DL / POa (5
0) 10. ON (25) / EC / PE (15) / EC / AL-Tr-EP (40) / DL / Co-PET (1
6) / DL / POa (50) ON (25) / DL / AL-Tr-EP-ME (40) / DL / Co-PET (16) / DL /
POa (50) 12. ON (25) / DL / AL-Tr-EP + POa (20) / DL / Co-PET (16) / D
L / POa (50) << B >> Example of a laminate in which the AL and the intermediate layer are formed by thermal lamination <Pouch specification> ON (15) / DL / AL-Tr-EP (20) / TL / POa (20) / DL / PET (12) / D
L / POa (50) 2. ON (15) / DL / AL-Tr-EP (20) / TL / POa (20) / EC / PET (12) / D
L / POa (50) 3. ON (15) / DL / AL-Tr-EP (20) / TL / POa (20) / EC / PET (12) /
EC / PET (12) / EC / POa (50) 4. ON (15) / DL / AL-Tr-EP (20) / TL / POa (20) // PMa (20) // TP
X (20) // PMa (20) // POa (50) ON (15) / DL / AL-Tr-POa (20) / TL / POa (20) / DL / PET (12) /
DL / POa (50) ON (15) / DL / AL-Tr-POa (20) / TL / POa (15) // PP (15) // PO
a (50) 7. ON (15) / DL / AL-Tr-Tr-EP-ME (20) / TL / POa (20) / EC / PET
(12) / DL / POa (50) ON (15) / DL / AL-Tr-Tr-EP + POa (20) / TL / POa (20) / EC /
PET (12) / DL / POa (50) <Emboss specification> (Since the PET part in the dry lamination specification is only Co-PET, only the following representative example is described.) ON (25) / DL / AL-Tr-EP (40) / TL / POa (20) / DL / Co-PET (1
6) / DL / POa (50) ON (25) / DL / AL-Tr-EP (40) / TL / POa (20) / EC / Co-PET (1
6) / DL / POa (50) ON (25) / DL / AL-Tr-EP (40) / TL / POa (15) // PP (15) / POa
(50)

When the packaging bag of the present invention is used as an outer package of a polymer battery, the form of the outer package may be a pouch type or an emboss type. The pouch type includes, in addition to the pillow type described above, a three-side seal type shown in FIG. 5A and a four-side seal type shown in FIG. 5B. In any of the embodiments, the sealing end is a hermetic seal including a part of a tab (electrode), and a part of the tab is exposed to the outside of the exterior body. Further, as shown in FIG. 5C, FIG. 5D or FIG. 4E, the tab may be exposed to the outside from an arbitrary position of the seal portion of the exterior body.

In the case of the embossing type, as shown in FIG. 2 (b), the shape of the exterior body 4 is such that the bottom member 6 includes an embossed portion 8 serving as a housing portion of the battery main body, a lid member 7, and a sealing seal. And a flange portion 9. The packaging material 6 for the bottom material is shown in FIG.
As shown in (a), the laminate is basically a four-layer laminate,
It is preferable that the polyester resin used for the outermost layer 11 and / or the intermediate layer 13 is a polyethylene terephthalate copolymer or a polybutylene terephthalate copolymer, and the stretching ratio in forming a film is reduced.
By using the copolymer, the shape of the bottom material is sharpened. When the container is used, the opening width (T) and the depth (D) shown in FIG. Over 1/50,
In addition, the side surface taper θ can be set to 130 ° or less, which facilitates molding. When aluminum is used as the barrier layer, the thickness is desirably 30 μm or more as a thickness that does not cause pinholes due to molding. When only one side is embossed, the cover 7 does not need to be made of a copolymer because it is not embossed. When embossing on both sides, a laminate of the bottom material may be used on both sides. By making the exterior body of the polymer battery embossed, the battery body can be easily stored. The tabs of the embossed type exterior body are also similar to those of the pouch type shown in FIG.
As shown in (d), the sealing portion of the exterior body may be exposed to the outside from an arbitrary position.

[0027]

EXAMPLE In order to control the effects of the packaging bag of the present invention, a sample in which the thickness of the heat-adhesive resin layer was changed by heat bonding was prepared as follows, and an actual moisture-proof factory was prepared. confirmed. <Preparation of packaging materials> Dry lamination of a 25 μm biaxially stretched nylon film and 50 μm of aluminum, and a 30 μm cast polypropylene film as a heat-adhesive resin layer are sequentially laminated by dry lamination to form a three-layer laminate. Created body. ON25μm / DL / AL50μm / DL / CPP30μm <Bag shape> The shape of the bag should be a three-sided seal bag of the size shown in Fig. 6 (a).
Was formed in a width of 5 mm each, and after sealing the contents, the portion 7c was hermetically sealed with a heat seal width of 20 mm. Incidentally, 7a and 7b prepare a bag as a heat seal layer of a set thickness in the present embodiment, and the thickness of the heat seal layer of the seal portion 7c after enclosing the content is as follows.
In each case, the heat seal width was set to about 20 μm and the heat seal width was set to 20 mm to reduce the amount of water vapor permeation from the end face of the heat seal.
A comparative experiment was conducted in which water vapor permeated from the end faces of the heat seal portions on the two sides a and 7b. <Preparation of Sample> When a bag having the above specifications was formed by heat sealing, the thickness and thickness of the cast polypropylene after heat sealing were changed to a sample by controlling the temperature and pressure of a heat sealing bar. . No1 60μm No2 40μm No3 20μm <Confirmation of moisture-proof / acceleration test conditions> As contents, DEC: Diethylcarbon, DMC: Dimethylcarbon, EC: Ethylcarbon 1: 1: 1 sealed, 80 ℃, 90% After being left in a RH constant temperature and humidity chamber for 7 days, the water content in the electrolytic solution was measured by the Karl Fischer method. <Results> Sample Initial moisture content Moisture content after accelerated test No1 60μm 50PPM 450PPM No2 40μm 50PPM 350PPM No3 20μm 50PPM 250PPM Every time the seal thickness increases by 20μm, the contents (the above-mentioned electrolyte)
Moisture content increased by 100 PPM.

[0028]

According to the packaging form of the present invention, the thickness of the heat-adhesive resin layer of the heat-adhesive portion of the heat-adhesive portion of the package which forms a sealing system by a heat-adhesion method using a laminate having at least one surface made of a heat-adhesive resin. By reducing the thickness, it was possible to form a package having a high degree of moisture resistance. It can be widely used for the packaging of foods, pharmaceuticals, chemicals, etc. that require ultra-high moisture-proof properties. This was effective in avoiding troubles such as lowering and peeling of the outer package.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing (a) two films to be thermally bonded, showing an embodiment of a packaging form of the present invention, (b) a packaging bag formed by thermal bonding, and an enlarged cross-section of X ₁ -X ₁ part. Figure, (d)
X ₂ -X ₂ parts is an enlarged cross-sectional view.

FIG. 2 shows another embodiment of the packaging form of the present invention, (a).
Perspective view showing a molded sheet and a lid material film to be thermally bonded, (b) a blister package formed by thermal bonding,
(C) X ₃ -X ₃ parts enlarged cross-sectional view, a (d) X ₄ -X ₄ parts enlarged sectional view.

FIGS. 3A and 3B are cross-sectional views illustrating an example of the configuration of a laminated body, in which FIG. 3A is a cross-sectional view of an example of a three-layered laminated body, and FIG.

FIG. 4 is a perspective view showing an example of a polymer battery using the packaging form of the present invention as an outer package.

FIG. 5 is a diagram schematically showing a system sealed by a barrier packaging material and intrusion of water vapor and the like into the system;
(A) is a cross section of the sealing system, and (b) is an enlarged view of a Y portion.

FIG. 6 is a bag used for a moisture-proof test of the packaging bag of the present invention, and is (a) a plan view and (b) a cross-sectional view along the line ZZ.

FIG. 7 shows an embodiment in which the packaging bag of the present invention is used in a pouch-type packaging form as an outer package of a polymer battery, wherein (a) a three-side seal, (b) a four-side seal, and (d) a pillow pouch. FIG. 9 shows another position where the tab of the polymer battery is taken out of the outer package.

FIG. 8 shows an embodiment in which the packaging bag of the present invention is used in an embossing type packaging form as an outer package of a polymer battery, in which (a) a perspective view of a molded sheet and a cross-sectional view along a line XX, and (b). FIG. 4 is a perspective view and a cross-sectional view showing an example of an outer package made of a double-sided molded sheet, and (c) and (d) showing different positions at which tabs are taken out of an embossed type package.

[Explanation of symbols]

 P Package H Thermal bonding part S Hot plate K Contents D Polymer battery B Polymer battery body T Tab 1 Upper surface material 2 Lower surface material 3 Lid material 4 Molded sheet 5 Molded part 6 Flange part 7 Heat seal part 8 Back seal part 9 Folding 10, 30 Laminated body 11, 31 Outermost layer 12, 32 Barrier layer 13, 33 Innermost layer (thermo-adhesive resin layer) 14 Adhesive layer 15 Intermediate layer 20 Polymer battery 21 Polymer battery main body 22 Exterior body 23 Tab 24 Heat bonding part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichi Hirai 1-1-1, Ichigaya Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Yoichi Mochizuki 1-chome, Ichigaga-cho, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd. (72) Inventor Rikiya Yamashita 1-1-1, Ichigaya Kagacho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. 3E064 AA01 AA05 AA09 BA17 BA24 BA36 BA54 BB03 BC07 BC18 EA18 3E067 AA11 AB01 AB32 AB81 AB96 BA12A BB12A BB14A BB15A BB16A BB18A BB25A BC07A CA04 CA05 CA24 EA06 EA08 EA09 4F100 AA17B AB01B AB10 AK01B AK01C AK03C AK03D AK04C AK07C AK08C AK17D AK24C AK42A AK42D AK46A AK46D AL04C AT00A BA03 BA04 BA10A BA10C BA13 BA15 CB03C DA01 DA03 DB01C DB06C EH66B EJ37A GB15 GB17 GB18 GB23 GB66 JA04C JD01B JD02 JD04 JL12C YY00A YY00C YY00D

Claims (8)

[Claims] 1. A laminate comprising at least a base material layer, a barrier layer and a heat-adhesive resin layer, wherein the heat-adhesive resin layers constituting the laminate are superposed facing each other, and the periphery of the superposed portion is provided. In a bag configured by providing a thermal bonding portion at the end of
A bag is formed by providing a heat bonding portion having a relationship of D ₀ <１ ／ (D ₁ + D ₂ ) where the thickness D ₁ , D _{2 of} each heat bonding resin layer and the thickness D ₀ of the heat bonding portion are D ₀ <1/2 (D ₁ + D ₂ ). A packaging bag comprising: 2. A laminate comprising at least a base material layer, a barrier layer, an intermediate layer and a heat-adhesive resin layer, and further, the heat-adhesive resin layers constituting the laminate are superposed facing each other, In a bag formed by providing a thermal bonding portion at an end around the outer periphery of the overlapped portion, the thicknesses D ₁ and D ₂ of the respective thermal bonding resin layers and the thickness D ₀ of the thermal bonding portion are represented by D ₀ < A packaging bag, wherein a thermal bonding portion having a relationship of 1/2 (D ₁ + D ₂ ) is provided to form a bag body. 3. A stretched PET having a base material layer having a thickness of 6 μm or more,
The packaging bag according to claim 1 or 2, further comprising at least one layer of stretched nylon. 4. A barrier layer comprising a metal foil, a barrier resin layer, and an inorganic oxide deposited layer.
A packaging bag according to any one of claims 1 to 3. 5. The intermediate layer according to claim 2, wherein the intermediate layer contains at least one layer of a polyester resin, a polyolefin resin, a nylon resin, and a fluorine resin having a thickness of 10 μm or more. A packaging bag as described. 6. The heat-adhesive resin layer has a thickness of 20 μm or more and a melting point of
80 ° or more, characterized by comprising an unsaturated carboxylic acid-grafted polyolefin resin containing an unsaturated carboxylic acid-grafted polyethylene having an Vicat softening point of 70 ° or more, unsaturated carboxylic acid-grafted polypropylene, and unsaturated carboxylic acid-grafted polymethylpentene. The packaging bag according to claim 1. 7. The packaging bag according to claim 1, wherein a form of the bag body is one of a three-sided type, a four-sided type, and a pillow type. 8. The bag-making method of the bag body is a tray type comprising a molded sheet having a molded portion formed thereon and a lid material covering the molded sheet. 7. The packaging bag according to any one of 6.