JPWO2004026715A1 - Packaging bag - Google Patents

Abstract

The present invention relates to a packaging bag formed by stacking laminated materials and heat-sealing the periphery. The packaging bag of the present invention includes a first laminated material in which a vapor deposition layer, an adhesive layer, a support layer, an adhesive layer, and a sealant layer are sequentially laminated on one side of the base material, and a vapor deposition layer, an adhesive layer, and an oxygen absorption layer on the single side of the base material. A second laminated material in which a layer, an adhesive layer, and a sealant layer are sequentially laminated, or the second laminated materials are laminated on the inner surface of the second laminated material, and the surroundings are heat-sealed. As a result, even if an easy-open function kerf is made with a laser beam, oxygen entering the wrapping bag from the kerf is absorbed by the oxygen absorbing layer, so the oxygen concentration in the wrapping bag does not increase. The contents can be stored well and can be used for retort sterilization and autoclave sterilization, and can be easily opened.

Description

  The present invention relates to a packaging bag formed by stacking laminated materials and heat-sealing the periphery, and particularly relates to a packaging bag having an easy-open function and high oxygen barrier properties.

Traditionally, packaging bags have been required to protect the contents and maintain the quality, and in particular, packaging bags containing food, pharmaceuticals, toiletries, etc. contain contents from the viewpoint of alteration and leakage of the contents. Packaging designs such as selection of packaging materials that meet requirements such as the type, shape, content, and shelf life of products are being carried out. Recently, simple and convenient cooked foods such as retort foods have become widespread, and packaging design has become more important.
As the packaging bag, a laminated material obtained by laminating various plastic films to be multilayered is used. For example, by using a laminated material in which various plastic films are laminated on one side of the base material and a sealant layer that can be sealed is provided on the outermost layer, the sealant layers of the laminated materials are superposed on the inner surface, so that the surroundings, that is, three sides or four sides A packaging bag formed by heat sealing is known.
Conventionally, from the viewpoint of content protection and quality maintenance, materials such as aluminum foil were laminated on the base material to add oxygen and water vapor barrier properties to the packaging bag. Recently, various deposited thin films having excellent gas barrier properties have been used as substitutes for aluminum foil because of problems such as property.
For example, by using a polyethylene terephthalate (PET) resin as a base material, an evaporating substance made of an inorganic oxide such as a single metal of aluminum or alumina (aluminum oxide) or silicon oxide is heated and evaporated by an electron beam vacuum deposition method. A deposited thin film is formed.
The deposited thin film on which the aluminum simple metal is deposited has a thickness of 50 nm or more and is stable in quality, and has an oxygen barrier property comparable to that of a conventional 7 μm aluminum foil. In addition, it has water vapor barrier properties, is 1/100 to 1/200 of aluminum foil, is lightweight, has superior bending strength than aluminum foil, and has excellent workability.
In addition, a packaging bag using a vapor-deposited thin film in which a metal oxide such as alumina or an inorganic oxide such as silicon oxide is vapor-deposited on a base material does not contain a metal substance such as a conventional aluminum foil. Retort foods that are finished foods can be warmed together with the packaging bag in a microwave oven, and the contents can be inspected with a metal detector. Furthermore, high temperature, long-time retort sterilization and autoclave sterilization are possible, combustion calorie is low, there is almost no incineration residue as seen in aluminum foil, and incineration can be performed with peace of mind.
On the other hand, convenience for easily taking out the contents from the packaging bag is important for the packaging bag. As a method, an easy opening function including a kerf is provided in a seal portion of many wrapping bags, and a device is devised to open the wrapping bag by using the kerf as a trigger and easily take out the contents.
As a method of providing an easy opening function consisting of kerfs in this packaging bag, conventionally, a kerf was mechanically provided in a predetermined position of the packaging bag with a metal mold consisting of a male mold and a female mold, Recently, it has become widespread to use a laser beam, which is a kind of electromagnetic wave, to provide a kerf at a predetermined position of a seal portion of a packaging bag (see Japanese Patent Application Laid-Open No. 2001-180690).
Since laser light is an electromagnetic wave having a uniform wavelength, phase, and vibration surface, it is also used in various applications in the packaging field.
However, as in the past, packaging bags that use aluminum foil as a base material to add gas barrier properties, even if the grooves are cut with laser light, the aluminum foil itself reflects the laser light and the aluminum foil is cut. However, the gas barrier property does not deteriorate, but the packaging bag with the gas barrier property added by using a vapor-deposited thin film deposited with an inorganic oxide such as alumina or silicon oxide can be easily irradiated with laser light. When a slit which is an opening function is provided, the laser beam cuts the deposited thin film, and oxygen enters into the packaging bag from the cut surface, resulting in a problem of deterioration of the contents.
Therefore, the present invention provides a kerf having an easy opening function even for a packaging bag having a gas barrier property using a vapor-deposited thin film on which a single metal such as aluminum or an inorganic oxide such as alumina or silicon oxide is deposited. It is an object of the present invention to provide a packaging bag that prevents deterioration of gas barrier properties and deterioration of contents.

In order to achieve the above object, the packaging bag of the present invention is configured as follows.
(1) The packaging bag of the present invention has a barrier layer in which a vapor deposition layer is provided on one side of the substrate, a first laminated material in which a sealant layer made of a synthetic resin is provided, and a vapor deposition layer on the single side of the substrate. And a second laminated material provided with a sealant layer made of a synthetic resin mixed with an oxygen absorbent and a synthetic resin mixed with an oxygen absorbent, with the sealant layer as the inner surface, and the surroundings are heated. It is sealed.
(2) The packaging bag of the present invention is configured as described in (1) above, wherein a support layer is provided on the vapor deposition layer of the first laminated material via an adhesive layer, and further on the upper surface of the support layer, A sealant layer made of a synthetic resin is provided through the adhesive layer, and at least one oxygen absorption layer made of a synthetic resin mixed with an oxygen absorbent is put through the adhesive layer on the vapor deposition layer of the second laminated material. A layer may be provided, and a sealant layer made of a synthetic resin may be further provided on the upper surface of the oxygen absorption layer via an adhesive layer.
(3) In the packaging bag of the present invention, in the configuration of the above (1) or (2), the vapor deposition layer of the first laminated material may be formed by vapor deposition of a single metal.
(4) In the packaging bag of the present invention, in the configuration of (1) or (2), the vapor deposition layer of the first laminated material may be formed by vapor depositing an inorganic oxide.
(5) The packaging bag of the present invention is provided with a barrier layer in which a vapor deposition layer is provided on one side of a substrate, an oxygen absorbent layer made of a synthetic resin mixed with an oxygen absorbent, and a sealant layer made of a synthetic resin. The second laminated materials are superposed with the sealant layer as the inner surface, and the periphery is heat sealed.
(6) The packaging bag of the present invention is the oxygen absorbent comprising the synthetic resin in which the oxygen absorbent is mixed via the adhesive layer on the vapor deposition layer of the second laminated material in the configuration of the above (5). It is also possible to provide at least one oxygen absorption layer formed between the synthetic resin layer and the synthetic resin layer, and further provide a sealant layer made of synthetic resin on the upper surface of the oxygen absorption layer via an adhesive layer.
(7) The packaging bag of this invention WHEREIN: The structure of said (1) or (5) WHEREIN: An iron type may be used for the oxygen absorbent of this 2nd laminated material.
(8) In the packaging bag of the present invention, in the configuration of (1) or (5), the vapor deposition layer of the second laminated material may be formed by vapor deposition of a single metal.
(9) In the packaging bag of the present invention, in the configuration of (1) or (5), the vapor deposition layer of the second laminated material may be formed by vapor depositing an inorganic oxide.
(10) The packaging bag of the present invention may be provided with a printing ink layer in the intermediate layer of the first laminated material and / or the second laminated material in the configuration of (2) or (6).
(11) The packaging bag of the present invention is opened in the laminated portion excluding the sealant layer from the barrier layer side in the first laminated material and / or the second laminated material in the configuration of (2) or (6) above. A kerf may be provided.
(12) In the packaging bag of the present invention, in the configuration of (11), the kerf may be provided by a carbon dioxide laser beam.
According to the packaging bag described in (1) to (12) above, by laminating at least one oxygen absorption layer on the second laminated material constituting the packaging bag, a single metal such as aluminum, alumina or silicon oxide Even if a slit with an easy-opening function is created with a laser beam in a packaging bag with a gas barrier added using a vapor-deposited thin film deposited with an inorganic oxide such as Since it is absorbed by the oxygen-absorbing layer, the oxygen concentration in the packaging bag does not increase, the content is well preserved, and has the convenience of being easily opened.

FIG. 1a is a sectional view of a first laminated material showing an embodiment of the packaging bag of the present invention, and FIG. 1b is a sectional view of a second laminated material showing another embodiment of the present invention.
FIG. 2a is a cross-sectional view of a first laminated material provided with an opening kerf showing an embodiment of the packaging bag of the present invention, and FIG. 2b is an opening cut showing another embodiment of the present invention. It is sectional drawing of the 2nd laminated material which provided the groove | channel.
3 is a cross-sectional view taken along the line XX ′ of FIG. 4 which is an embodiment of the packaging bag of the present invention.
FIG. 4 is a plan view showing an embodiment of the packaging bag of the present invention.
FIG. 5 is a cross-sectional view taken along line YY ′ of FIG. 4 which is an embodiment of the packaging bag of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1a shows a substrate layer 1b provided with a printing ink layer 2 on a vapor deposition layer 1b of a barrier layer 1 provided with a vapor deposition layer 1b on one side of the substrate 1a. 4 is a cross-sectional view of a first laminated material A in which a support layer 4 is further provided with a sealant layer 5 via an adhesive layer 3.
FIG. 1 b shows an oxygen absorbent layer made of a synthetic resin in which an oxygen absorbent is mixed via an adhesive layer 3 on the vapor deposition layer 1 b of the barrier layer 1 having a vapor deposition layer 1 b provided on one side of the substrate 1 a. A cross section of a second laminated material B in which an oxygen absorption layer 6 is provided in which 6b is provided between the synthetic resin layer 6a and the synthetic resin layer 6a, and a sealant layer 5 is further provided on the oxygen absorption layer 6 with an adhesive layer 3 interposed therebetween. FIG.
FIG. 2a shows a printing ink layer 2 provided on a vapor deposition layer 1b of a barrier layer 1 provided with a vapor deposition layer 1b on one side of a substrate 1a, and a support layer on the printing ink layer 2 via an adhesive layer 3. 4, and further, a laser beam is irradiated from above the barrier layer 1 of the first laminated material A in which the support layer 4 is provided with the sealant layer 5 via the adhesive layer 3, and the laminated portion excluding the sealant layer 5 It is sectional drawing of the 1st laminated material A which provided the groove 7 of the easy-opening function at the same.
FIG. 2B shows an oxygen absorbent layer made of a synthetic resin in which an oxygen absorbent is mixed via an adhesive layer 3 on the vapor deposition layer 1b of the barrier layer 1 formed by providing the vapor deposition layer 1b on one side of the substrate 1a. 6b is provided between the synthetic resin layer 6a and the synthetic resin layer 6a, the oxygen absorption layer 6 is provided, and the oxygen absorption layer 6 is further provided with the sealant layer 5 with the adhesive layer 3 interposed therebetween. It is sectional drawing of the 2nd laminated material B which irradiated the laser beam from the barrier layer 1, and provided the slit 7 of the easy-opening function in the laminated part except this sealant layer 5. FIG.
3A and 3B, the first laminated material A shown in FIG. 1a and the second laminated material B shown in FIG. 1b are overlapped with the sealant layer 5 as an inner surface, and the three seal portions 8 are heat sealed by a heat sealing method. It is sectional drawing of the packaging bag created in this way (sectional drawing between XX 'of FIG. 4).
4A and FIG. 4B, the first laminated material A shown in FIG. 1a and the second laminated material B shown in FIG. 1b are overlapped with the sealant layer 5 as an inner surface, and the three seal portions 8 are heat sealed by a heat sealing method. A predetermined position for opening the packaging bag is irradiated with a laser beam from the barrier layer 1 of the packaging bag created in this way, and a groove 7 for opening with an easy opening function is formed in the laminated portion excluding the sealant layer 5. It is a top view which shows the packaging bag which has the provided easy-open function. In FIG. 4, the kerf 7 is provided linearly in the lateral direction of the packaging bag. However, the shape of the kerf 7 is not limited to a linear shape, and a predetermined opening for opening the packaging bag. It may be provided only in the seal portion 8. In FIG. 4, the notch 9 is provided in order to further facilitate the opening of the packaging bag. However, the necessity and shape of the notch 9 can be appropriately changed according to the packaging design.
5A and 5B, the first laminated material A shown in FIG. 1a and the second laminated material B shown in FIG. 1b are overlapped with the sealant layer 5 as an inner surface, and the three seal portions 8 are heat sealed by a heat sealing method. FIG. 3 is a cut groove sectional view of a packaging bag in which a cut groove 7 for opening is provided in a laminated portion excluding the sealant layer 5 at a predetermined position for opening the packaging bag from the barrier layer 1 of the packaging bag created in the above. (Cross sectional view between YY 'in FIG. 4).
The base material 1a constituting the barrier layer 1 in the first laminated material A of the present invention has protective properties (mechanical strength such as burst strength, gas barrier property that does not allow oxygen to permeate, cold resistance, etc.) required as a packaging material. Stability), workability (such as packaging machinery), convenience (such as opening), merchandise (such as printing), economy (price, etc.), safety and hygiene (non-toxic, easy disposal, etc.) If satisfied, there is no particular limitation, but for example, a normal polyethylene terephthalate (PET) resin, a polyamide (Ny) resin, a polypropylene (PP) resin, a uniaxial or biaxial stretch made of any one synthetic resin Film or biaxially oriented polypropylene film (KOP) coated with vinylidene chloride can be used, but polyethylene terephthalate (PET) resin and polyamide (Ny) resin Film is preferred. The thickness of the substrate 1a is appropriately determined depending on the size of the packaging bag, the type of contents to be stored, the shape, the weight, the storage period, the suitability of the packaging machine, etc., but is preferably in the range of 12 μm to 25 μm.
The vapor deposition layer 1b provided on the base material 1a constituting the barrier layer 1 of the first laminated material may vapor deposit a single metal such as aluminum, or an inorganic oxide such as alumina or silicon oxide. Examples of the method of providing the vapor deposition layer 1b on the substrate 1a include a vacuum vapor deposition method, a CVD method, a sputtering method, and the like. In a vacuum environment, the vaporized material is irradiated with an electron beam, and the vaporized material is heated and evaporated. A winding type electron beam vacuum deposition method for fixing on the substrate 1a is preferable. The thickness of the vapor deposition layer 1b varies depending on the evaporated substance, but 10 nm or more is stable in quality.
The printing ink layer 2 of the first laminated material A may be an intermediate layer constituting the first laminated material A, but preferably on one side of the base material 1a constituting the barrier layer 1 of the first laminated material A Designed to improve characters, designs, coloring, or sales promotion effects such as product information on the contents of the packaging bag on the entire surface of the vapor deposition layer 1b provided on the surface, or on the entire surface excluding the seal portion 8 at the periphery of the vapor deposition layer 1b. A beautiful printing ink layer 2 is provided. Note that the printing ink layer 2 may be provided in an intermediate layer constituting the second laminated material B.
In addition, the printing method of the printing ink layer 2 of the first laminated material A uses flexographic printing or gravure printing, but gravure printing is preferable for performing beautiful printing. Gravure printing inks include dyes and pigments that give color to the inks, vehicles that disperse and hold the dyes and pigments in fine particles, and adhere to the substrate, and auxiliary agents that improve the physical properties of the ink. It has become. As the color material, a pigment having good light resistance is preferable. The resin that is the main component of the vehicle is not particularly limited as long as it is a resin that can be varnished by dissolving it in an organic solvent, regardless of whether it is a natural resin or a synthetic resin. For example, nitrocellulose-based, polyamide-based, vinyl chloride-based , Urethane-based and chlorinated olefin-based resins are arbitrarily selected. The organic solvent is not particularly limited as long as it can dissolve the resin stably, maintain the dispersibility of the pigment, maintain the fluidity of the ink, and transfer an appropriate amount of ink from the printing plate. Solvents such as hydrocarbons, esters, and ketones are used alone or in combination. Auxiliaries are added to gravure printing inks in small amounts to improve the ink performance, but mainly for the purpose of improving pigment dispersibility, color development, preventing precipitation, and improving fluidity. It is common to add a plasticizer to add an activator or improve the adhesion of the resin. The amount of ink applied to the printing ink layer 2 may be the same as in normal gravure printing, and the thickness is preferably about 35 μm, which is the normal plate depth of gravure printing, for example.
The support layer 4 of the first laminated material A is made of a synthetic resin, and the synthetic resin is preferably a film similar to the substrate 1a constituting the barrier layer 1 in the first laminated material A of the present invention. The thickness of the synthetic resin film used for the support layer 4 is preferably in the range of 12 μm to 25 μm.
The method of laminating the support layer 4 of the first laminated material A, the printing ink layer 2 and the sealant layer 5 includes a dry lamination method in which an adhesive for dry lamination is used as the adhesive layer 3, or a low density polyethylene (LDPE). ) Extrusion lamination method in which a resin melt-extruded using a resin, polypropylene (PP) resin, ethylene-vinyl acetate copolymer (EVA) resin, ionomer resin or the like serves as the adhesive layer 3, and further the adhesion There is a hot melt lamination method using a hot melt adhesive as the layer 3, but a dry lamination method is preferable in view of adhesiveness, heat resistance and the like. In addition, as the adhesive for dry lamination, urethane, modified butadiene, alkyl titanate, or the like can be used. When the extrusion lamination method is adopted, it is preferable to provide an anchor coat layer between the melt-extruded resin and the support layer 4 or the printing ink layer 2.
The sealant layer 5 of the first laminated material A is composed of linear low density polyethylene resin (L-LDPE), low density polyethylene (LDPE) resin, medium density polyethylene (MDPE) resin, high density polyethylene (HDPE) unstretched polypropylene ( CPP) resin, ionomer resin, ethylene-vinyl acetate copolymer (EVA) resin, ethylene-vinyl acetate alcohol copolymer (EVOH) resin, etc. can be used, but high-density polyethylene (HDPE) or unstretched polypropylene ( CPP) resin films are preferred. The thickness of the synthetic resin film used for the sealant layer 5 is preferably in the range of 20 μm to 50 μm.
The method of providing the base material 1a which comprises the barrier layer 1 in the 2nd laminated material B of this invention, and the vapor deposition layer 1b provided on the base material 1a may be the same as that of the 1st laminated material A shown in FIG. 1a.
The synthetic resin layer 6a constituting the oxygen absorption layer 6 of the second laminated material B is a uniaxial or biaxially stretched film made of any one synthetic resin of ordinary polyethylene terephthalate (PET), polyamide resin, and polypropylene resin. Can be used.
The oxygen absorbent mixed in the oxygen absorbent layer 6b of the second laminated material B may be of various types such as iron, but any type of iron or organic can be used as long as it has an oxygen absorption capacity. Any kind is acceptable. However, generally, when kneading into a synthetic resin, an iron system that is economical in terms of cost is preferable. The oxygen absorbent is roughly classified into iron-based and organic-based, and the iron-based one further touches moisture-dependent type or air that absorbs oxygen only by touching high-humidity air due to iron powder or iron compound. At the same time, there is a self-reactive type that begins to absorb oxygen, and organic systems include ascorbic acid, ascorbate, porphyrin complexes, macrocyclic polyamine complexes, and the like as self-reactive types.
The method of laminating the oxygen absorbing layer 6 of the second laminated material B, the barrier layer 1 and the sealant layer 5 is the same as the method of laminating the support layer 4 of the first laminated material A, the printing ink layer 2 and the sealant layer 5. Good.
The sealant layer 5 of the second laminated material B is preferably a film similar to the first laminated material A, and the thickness of the synthetic resin film used for the sealant layer 5 is preferably in the range of 20 μm to 50 μm.
The laser beam for adding the easy opening function to the first laminated material A and the second laminated material B is not particularly limited, but a carbon dioxide laser beam is preferable.

As a base material 1a of the barrier layer 1 of the first laminated material A shown in FIG. 1a, a roll-shaped biaxially stretched polyester film having a thickness of 12 μm is used, and an evaporating substance made of silicon oxide is formed on one surface of the base material 1a. The vapor deposition layer 1b was formed by evaporating and fixing by the beam vacuum vapor deposition method.
Next, the gravure printing ink which consists of urethane type resin was printed on the single side | surface of the vapor deposition layer 1b of the barrier layer 1 with the gravure plate of 35 micrometer of plate depths, and the printing ink layer 2 was formed.
Next, an ordinary urethane-based dry lamination adhesive is applied on the printing ink layer 2 by a gravure solid plate having a plate depth of 30 μm to form about 2 g / m ² to form an adhesive layer 3 having a thickness of 20 μm. Lamination was performed by a dry lamination method with a support layer 4 made of a roll-shaped biaxially stretched nylon film.
Next, an ordinary urethane-based dry lamination adhesive is applied to the entire surface of the support layer 4 made of the biaxially stretched nylon film by a gravure solid plate having a plate depth of 30 μm to a thickness of about 2 g / m ^2. Was laminated with a sealant layer 5 made of a roll-shaped unstretched polypropylene film having a thickness of 50 μm by a dry lamination method to prepare a first laminated material A.
Moreover, as the base material 1a of the barrier layer 1 of the second laminated material B shown in FIG. 1b, similarly to the base material 1a constituting the barrier layer 1 in the first laminated material A of the present invention, a roll shape having a thickness of 12 μm is used. Using a biaxially stretched polyester film, an evaporation substance made of silicon oxide was evaporated and fixed on one surface of the substrate 1a by an electron beam vacuum evaporation method to form an evaporation layer 1b having a thickness of 40 nm.
Next, an adhesive layer 3 was formed by applying about 2 g / m ² of an ordinary urethane-based dry lamination adhesive with a gravure solid plate having a plate depth of 30 μm on one side of the vapor deposition layer 1 b of the barrier layer 1.
Next, a biaxially stretched polypropylene film is formed on both surfaces of an oxygen absorbent layer 6b in which an iron-based oxygen absorbent is mixed in a synthetic resin made of a biaxially stretched polypropylene film previously prepared in a separate process on the adhesive layer 3. The oxygen absorption layer 6 in which the synthetic resin layer 6a made of is laminated.
Next, an ordinary urethane-based dry lamination adhesive is applied on the oxygen absorbing layer 6 with a gravure solid plate having a plate depth of 30 μm to a thickness of about 2 g / m ² to form an adhesive layer 3 having a thickness of 50 μm. A second laminate material B was prepared by laminating with a sealant 5 made of a roll-shaped unstretched polypropylene film of the above by a dry lamination method.
As shown in FIG. 3, the sealant layer 5 formed on the first laminated material A and the second laminated material B is overlapped, and as shown in FIG. did.
Next, when heat-seal-type bag making processing is performed on the three-side seal portion 8, a predetermined position such as a kerf 7 in FIG. 4 is formed from the barrier layer 1 which is the outer surface of the first laminated material A and the second laminated material B. The barrier layer except the sealant layer of the first laminated material A and the second laminated material B is irradiated with carbon dioxide laser light having a transmission wavelength of 1,060 nm at a scanning speed of 300 mm / sec, a frequency of 10 kHz, and an output of 20 W to 60 W. An easy-open function kerf was formed in layer 1 and the like.
Furthermore, a packaging bag having an easy-open function in which three sides of 150 mm in width and 200 mm in length were heat-sealed by the cutter device part was created.

As the vapor deposition layer 1b of the first embodiment, an evaporating substance made of aluminum is oxidized and fixed by an electron beam vacuum vapor deposition method to form an alumina vapor deposition layer having a thickness of 20 nm. A heat-sealed packaging bag having an easy-open function was prepared.
Using the packaging bag described above, the opening was sealed to form a four-sided seal, and when it was torn from the kerf to confirm the easy opening function of the completely sealed four-side sealed packaging bag, both Example 1 and Example 2 were very Could be opened easily.
Using the above packaging bag, filling the retort food, sealing the opening to make a four-sided seal, and tearing it from the cut groove to confirm the easy-open function of the completely sealed four-side sealed packaging bag Both Example 1 and Example 2 could be opened very easily.
Next, when the oxygen permeability was measured as the barrier property of the packaging bag, the numerical value of the oxygen permeability before providing the kerf by laser light in both Example 1 and Example 2 was 0 from 0.5 ml / m ² · 24 hr. .7ml ^/ m 2 · 24hr at which was, but the result of providing the cut groove, the numerical value of the oxygen permeability of ^{1.5ml / m 2 · 24hr 2.0ml /} m 2 · 24hr , and the considerable oxygen barrier property Deterioration was observed.
Therefore, a packaging bag made by stacking the first laminated material A not containing the oxygen absorbing layer 6 and the second laminated material B containing the oxygen absorbing layer 6 with the sealant layer 5 as the inner surface, and further, the oxygen absorbing layer 6 Using packaging bags made of the first laminated material A not included with the sealant layer 5 as the inner surface, each packaging bag is purged with nitrogen, and the opening portion of the packaging bag is sealed to completely nitrogen. The four-sided sealed packaging bag was retort sterilized at 120 ° C for 30 minutes, stored in an atmosphere of 40 ° C and 90% RH for 2 months, and the oxygen concentration in the packaging bag was measured. Although the oxygen concentration in the packaging bag of Example 1 and Example 2 by the combination of the material A and the second laminated material B including the oxygen absorbing layer 6 was 0, the first laminated material A not including the oxygen absorbing layer 6 The oxygen concentration in the packaging bag is 3%. There was.

  As described above, the packaging bag of the present invention is useful for a packaging bag having a kerf with an easy-open function, and in particular, can be used for retort sterilization and autoclave sterilization and has excellent oxygen barrier properties. Suitable for packaging bags.

Claims (12)

Mixing the barrier layer with a vapor deposition layer on one side of the substrate, the first laminated material with a sealant layer made of synthetic resin, the barrier layer with the vapor deposition layer on one side of the substrate, and an oxygen absorbent A package comprising an oxygen absorbent layer made of a synthetic resin and a second laminated material provided with a sealant layer made of a synthetic resin, with the sealant layer as an inner surface and the surroundings are heat-sealed. bag. A support layer is provided on the vapor-deposited layer of the first laminated material via an adhesive layer, and a sealant layer made of a synthetic resin is provided on the upper surface of the support layer via an adhesive layer. At least one oxygen absorption layer made of a synthetic resin mixed with an oxygen absorbent is provided on the vapor deposition layer of the laminated material via an adhesive layer, and synthesized on the upper surface of the oxygen absorption layer via an adhesive layer. The packaging bag according to claim 1, further comprising a sealant layer made of resin. The packaging bag according to claim 1 or 2, wherein the vapor deposition layer of the first laminated material is formed by vapor deposition of a single metal. The packaging bag according to claim 1 or 2, wherein the vapor deposition layer of the first laminated material is formed by vapor deposition of an inorganic oxide. A second laminated material provided with a barrier layer in which a vapor deposition layer is provided on one side of a substrate, an oxygen absorbent layer made of a synthetic resin mixed with an oxygen absorbent, and a sealant layer made of a synthetic resin, and the sealant A packaging bag comprising layers stacked on the inner surface and heat-sealed around the periphery. An oxygen absorbing layer in which an oxygen absorbent layer made of a synthetic resin mixed with an oxygen absorbent is provided between the synthetic resin layer and the synthetic resin layer on the vapor deposition layer of the second laminated material via an adhesive layer. The packaging bag according to claim 5, wherein a sealant layer made of a synthetic resin is further provided on the upper surface of the oxygen absorbing layer via an adhesive layer. The packaging bag according to claim 1 or 5, wherein the oxygen absorbent of the second laminated material uses iron. The packaging bag according to claim 1 or 5, wherein the vapor deposition layer of the second laminated material is formed by vapor deposition of a single metal. The packaging bag according to claim 1 or 5, wherein the vapor deposition layer of the second laminated material is formed by vapor deposition of an inorganic oxide. The packaging bag according to claim 1 or 5, wherein a printing ink layer is provided on an intermediate layer of the first laminated material and / or the second laminated material. 6. An opening kerf is provided in the laminated portion excluding the sealant layer from the barrier layer side in the first laminated material and / or the second laminated material. The packaging bag described. 12. The packaging bag according to claim 11, wherein the kerf is provided by a carbon dioxide laser beam.

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