WO2004026715A1

WO2004026715A1 - Package bag

Info

Publication number: WO2004026715A1
Application number: PCT/JP2003/011889
Authority: WO
Inventors: Shunichi Shiokawa; Wataru Yamamoto
Original assignee: Toppan Printing Co., Ltd.
Priority date: 2002-09-19
Filing date: 2003-09-18
Publication date: 2004-04-01
Also published as: AU2003264484A1; JPWO2004026715A1

Abstract

A package bag comprising laminate materials overlaid and heat-sealed on the peripheries thereof. The package bag is formed, with sealant layers set at the inner side thereof, by overlaying, a first laminate material consisting of a vapor-deposition layer, an adhesion layer, a support layer, an adhesion layer, and sealant layer sequentially laminated on one surface of a substrate, on a second laminate material consisting of a vapor-deposition layer, an adhesion layer, an oxygen absorbing layer, an adhesion layer, and sealant layer sequentially laminated on one surface of a substrate, or by overlaying one second laminate material on another second material, and heat-sealing the peripheries of the materials. Accordingly, even when an easy-to-open-function cut groove is formed with a laser beam, oxygen intruding into the package bag through the cut groove is absorbed by the oxygen absorbing layer to thereby prevent the oxygen concentration in the package bag from increasing, preserve the bag contents satisfactorily, allow the bag to be used for retort sterilizing and autoclave sterilizing, and provide an easy-to-open convenience.

Description

Technical field

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

Landscape technology

Conventionally, packaging bags have been required to protect the contents and maintain the quality of the contents.Especially, packaging bags containing foods, pharmaceuticals, toiletries, etc. Packaging design is performed, such as selection of packaging materials that meet requirements such as seed documents, shape, contents, and storage period of the contents. Recently, the packaging design has become more important due to the spread of simple and convenient prepared foods such as retort foods.

As a packaging bag, a laminated material obtained by laminating various plastic films to form a multilayer is used. For example, using a laminated material in which various plastic films are laminated on one surface of a base material and a sealant layer that can be sealed on the outermost layer is used, the sealant layers of the laminated materials are superimposed on the inner surface to form a peripheral layer. A packaging bag formed by heat sealing three or four sides is known. In the past, from the viewpoint of protecting the contents and maintaining the quality, a material such as aluminum foil was laminated on the base material to add a gas barrier property to prevent oxygen and water vapor to the packaging bag. In recent years, various vapor-deposited thin films having excellent gas barrier properties have been used as substitutes for aluminum foil due to problems such as properties.

For example, using a polyethylene terephthalate (PET) resin as a base material, aluminum simple metal or alumina ( An evaporated substance composed of an inorganic oxide such as aluminum oxide) or silicon oxide is heated and evaporated to form a vapor-deposited thin film.

The deposited thin film obtained by depositing the aluminum simple metal is stable in quality when the thickness is 50 nm or more, and has the same oxygen barrier property as the conventional 7 μm aluminum foil. In addition, it has a water vapor barrier property, and aluminum foil 1 Z

It is lightweight at 100 to 1/200, has better flexural strength than aluminum foil, and has excellent workability.

In addition, a packaging bag using a vapor-deposited thin film obtained by vapor-depositing a metal oxide such as alumina or an inorganic oxide such as silicon oxide on a base material does not contain a metal substance such as a conventional aluminum foil. Pre-cooked foods such as retort foods can be heated in a microwave oven along with their packaging bags, and the contents can be inspected with a metal detector. In addition, high-temperature, long-time retort sterilization and autoclave sterilization are possible, burning calories are low, and there is almost no incineration residue as found in aluminum foil, so incineration can be performed with confidence.

—On the other hand, convenience is important for a packaging bag so that the contents can be easily removed from the packaging bag. As a method, many packaging bags are provided with an easy-opening function consisting of a kerf at the seal, and the kerf is used to open the wrapping bag and easily remove the contents. .

As a method of providing an easy-opening function comprising a kerf in this packaging bag, conventionally, a kerf was mechanically provided in a predetermined position of the packaging bag with a metal mold composed of a male mold and a female mold. Recently, it has become widespread to provide a cut groove at a predetermined position of a sealing portion of a packaging bag by using a laser beam, which is a kind of electromagnetic wave (Japanese Patent Application Laid-Open No. 200-18069). 0 gazette).

Laser light is an electromagnetic wave with a uniform wavelength, phase, and oscillating surface, so it is used for various purposes in the packaging field. However, as in the past, in a packaging bag in which gas barrier properties were added using aluminum foil as the base material, the aluminum foil itself reflected the laser light and cut the aluminum foil, even if a kerf was created using laser light. Gas barrier properties do not decrease because they are not applied.However, in a packaging bag to which gas barrier properties are added using a vapor-deposited thin film on which an inorganic oxide such as alumina or silicon oxide is vapor-deposited, a laser beam is applied. If a kerf is provided as an easy-open function, the laser beam cuts the vapor-deposited thin film, and oxygen enters the packaging bag from the cut surface, causing a problem that the contents are deteriorated.

Therefore, the present invention has an easy-open function even in a packaging bag provided with a gas barrier property by 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 vapor-deposited. An object of the present invention is to provide a packaging bag that prevents gas barrier properties from deteriorating and contents from deteriorating by providing kerfs.

Disclosure of the invention

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 comprises a barrier layer having a vapor deposition layer provided on one surface of a base material, a first laminated material having a sealant layer made of a synthetic resin, and a vapor deposition layer provided on one surface of the base material. Barrier layer, a second laminated material provided with an oxygen absorbent layer made of a synthetic resin mixed with an oxygen absorbent, and a sealant layer made of a synthetic resin with the sealant layer on the inner surface, and the surrounding area is heated. Sinolle has been.

(2) The packaging bag according to the above (1), wherein a support layer is provided on the vapor-deposited layer of the first laminated material via an adhesive layer, and further provided on an upper surface of the support layer. Providing a sealant layer made of a synthetic resin via an adhesive layer; (2) At least one oxygen-absorbing layer made of a synthetic resin mixed with an oxygen absorbent is provided on the vapor-deposited layer of the laminated material via an adhesive layer, and on the upper surface of the oxygen-absorbing layer, via an adhesive layer. A sealant layer made of a synthetic resin may be provided.

(3) In the packaging bag of the present invention, in the configuration of the above (1) or (2), the deposited layer of the first laminated material may be formed by depositing a single metal.

(4) In the packaging bag of the present invention according to the above (1) or (2), the vapor deposition layer of the first laminated material may be formed by vapor deposition of an inorganic oxide.

(5) The packaging bag of the present invention comprises a parliament layer provided with a vapor deposition layer on one side of a base material, an oxygen absorbent layer made of a synthetic resin mixed with an oxygen absorbent, and a sealant layer made of a synthetic resin. The provided second laminated materials are overlapped with the sealant layer as an inner surface, and the periphery thereof is heat-sealed.

(6) The packaging bag according to the above (5), wherein in the configuration (5), an oxygen absorbing material made of a synthetic resin mixed with an oxygen absorbing agent on the vapor deposition layer of the second laminated material via an adhesive layer. At least one oxygen-absorbing layer provided between the synthetic resin layers and the synthetic resin layer may be provided, and a sealant layer made of a synthetic resin may be further provided on the upper surface of the oxygen-absorbing layer via an adhesive layer. .

(7) In the packaging bag of the present invention, in the configuration of the above (1) or (5), an iron-based oxygen absorber of the second laminated material may be used.

(8) In the packaging bag of the present invention according to the above (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 according to the above (1) or (5), the vapor deposition layer of the second laminated material may be formed by vapor deposition of an inorganic oxide.

(10) The packaging bag according to the above (2) or (6), wherein a printing ink layer is provided on the intermediate layer of the first laminated material and / or the second laminated material. It may be.

(11) In the packaging bag according to the above (2) or (6), the packaging bag according to the present invention may further include a laminated part excluding the sealant layer from the barrier layer side in the first laminated material and Z or the second laminated material. May be provided with a kerf for opening.

(12) In the packaging bag of the present invention, in the configuration of the above (11), the cut groove may be provided by a carbon dioxide gas laser beam.

According to the packaging bag described in the above (1) to (12), by laminating at least one or more oxygen absorbing layers on the second laminated material constituting the packaging bag, a single metal such as aluminum, alumina or oxidized Even if a kerf with an easy-open function is created with a laser beam on a packaging bag that has a gas barrier property using a vapor-deposited thin film on which an inorganic oxide such as silicon is vapor-deposited, penetrates into the packaging bag from the kerf. Oxygen is absorbed by the oxygen absorbing layer, so that the oxygen concentration in the packaging bag does not increase, the contents are preservable, and the bag can be easily opened.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1a is a sectional view of a first laminated material showing one 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 a cut groove for opening showing an embodiment of the packaging bag of the present invention, and FIG. 2B is an opening showing another embodiment of the present invention. FIG. 4 is a cross-sectional view of a second laminated material provided with a cutting groove for use.

FIG. 3 is a cross-sectional view taken along line XX ′ of FIG. 4, which is an embodiment of the packaging bag of the present invention.

FIG. 4 is a plan view showing one embodiment of the packaging bag of the present invention.

FIG. 5 is a sectional view taken along line Y--Y of FIG. 4, which is an embodiment of the packaging bag of the present invention. It is.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1a shows a substrate 1a, on which a printing ink layer 2 is provided on the vapor deposition layer 1b of the barrier layer 1 in which a vapor deposition layer 1b is provided on one side, and the printing ink layer 2 is provided with an adhesive layer 3 interposed therebetween. FIG. 4 is a cross-sectional view of a first laminated material A in which a support layer 4 is provided through the adhesive layer 3 and a sealant layer 5 is further provided on the support layer 4 with an adhesive layer 3 interposed therebetween.

Fig. 1b shows an oxygen layer made of a synthetic resin mixed with an oxygen absorbent via an adhesive layer 3 on the vapor-deposited layer lb of the barrier layer 1 in which the vapor-deposited layer 1b is provided on one side of the base material 1a. An oxygen absorbing layer 6 was provided in which an absorbent layer 6b was provided between the synthetic resin layers 6a and 6a, and a sealant layer 5 was further provided on the oxygen absorbing layer 6 with an adhesive layer 3 interposed therebetween. FIG. 4 is a cross-sectional view of a second laminated material B.

FIG. 2a shows a substrate 1a, a printing ink layer 2 provided on the vapor deposition layer lb of the barrier layer 1 having a vapor deposition layer 1b provided on one side, and an adhesive layer 3 on the printing ink layer 2 A laser beam is radiated from above the barrier layer 1 of the first laminated material A in which a support layer 4 is provided, and a sealant layer 5 is provided on the support layer 4 via an adhesive layer 3, and the sealant layer 5 is provided. FIG. 4 is a cross-sectional view of a first laminated material A in which a kerf 7 having an easy-opening function is provided in the laminated portion except for FIG.

Fig. 2b shows an oxygen layer made of a synthetic resin mixed with an oxygen absorbent via the adhesive layer 3 on the vapor deposition layer lb of the barrier layer 1 having the vapor deposition layer 1b provided on one side of the base material 1a. An oxygen absorbing layer 6 was provided in which an absorbent layer 6b was provided between the synthetic resin layers 6a and 6a, and a sealant layer 5 was further provided on the oxygen absorbing layer 6 with an adhesive layer 3 interposed therebetween. FIG. 3 is a cross-sectional view of a second laminated material B in which a laser beam is irradiated from above the barrier layer 1 of the second laminated material B, and a cut groove 7 having an easy-opening function is provided in a laminated portion excluding the sealant layer 5. ' In Fig. 3, the first laminated material A shown in Fig. 1a and the second laminated material B shown in Fig.lb are overlapped with the sealant layer 5 inside, and the three sealing parts 8 are heat-sealed by the heat sealing method. Fig. 4 is a cross-sectional view of the packaging bag created as shown in Fig. 4 (cross section taken along line X-X in Fig. 4).

Fig. 4 shows the first laminated material A shown in Fig. 1a and the second laminated material shown in Fig.

B with the sealant layer 5 on the inner surface, and heat-sealing the three sealing portions 8 by the heat sealing method. From the barrier layer 1 of the packaging bag created, place the laser on a predetermined position to open the packaging bag. FIG. 4 is a plan view showing a packaging bag having an easy-opening function in which a cut groove 7 for opening the easy-opening function is provided in a laminated portion except for the sealant layer 5 by irradiating light. In FIG. 4, the cut groove 7 is provided linearly in the lateral direction of the packaging bag. However, the shape of the cut groove 7 is not limited to a linear shape, and may be a predetermined shape for opening the packaging bag. It may be provided only in the seal portion 8 of the first embodiment. Further, in FIG. 4, the notch 9 is provided to further facilitate opening of the packaging bag, but the necessity and shape of the notch 9 can be appropriately changed according to the packaging design.

In Fig. 5, the first laminated material A shown in Fig. 1a and the second laminated material B shown in Fig.lb are overlapped with the sealant layer 5 inside, and the three sealing portions 8 are heat-sealed by the heat sealing method. FIG. 4 is a cross-sectional view of a packaging bag provided with an opening groove 7 at a predetermined position where the packaging bag is to be opened from above the barrier layer 1 of the packaging bag created by the above, at a laminated portion excluding the sealant layer 5. Yes (cross section between Y and Y in Fig. 4).

The base material 1a constituting the barrier layer 1 in the first laminated material A of the present invention has a protective property (mechanical strength such as burst strength, gas barrier property that cannot transmit oxygen, etc.) required as a packaging material. , Stability against cold, etc.), workability (appropriate packaging machine, etc.), convenience (openability, etc.), merchantability (appropriate printing, etc.), economy There are no particular restrictions as long as the properties (eg, price) and safety and hygiene (eg, non-toxic, easily disposable) are satisfied. For example, ordinary polyethylene terephthalate (PET) resin, polyamide (Ny) resin, polypropylene (PP) A uniaxially or biaxially stretched film made of any one type of synthetic resin, or a biaxially oriented polypropylene film (KOP) coated with vinylidene chloride can be used. Films of terephthalate (PET) resin and polyamide (Ny) resin are preferred. The thickness of the base material la is appropriately determined depending on the size of the packaging bag, the type, shape, weight, storage period, and the suitability of the packaging machine for the contents to be stored, but is preferably in the range of 12 m 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 be formed by vapor deposition of a simple metal such as aluminum or an inorganic oxide such as alumina or silicon oxide. Examples of the method for providing the vapor deposition layer 1b on the substrate 1a include a vacuum vapor deposition method, a CVD method, and a sputtering method.The evaporating substance is irradiated with an electron beam in a vacuum environment, and the evaporating substance is heated and evaporated. Then, a roll-to-roll electron beam vacuum deposition method in which the film is fixed on the substrate 1a is preferable. The thickness of the deposited layer lb depends on the evaporating substance, but the quality is stable at 10 nm or more.

The printing ink layer 2 of the first laminated material A may be an intermediate layer constituting the first laminated material A, but is preferably a substrate 1a constituting the barrier layer 1 of the first laminated material A. On the entire surface of the vapor deposition layer 1 b provided on one side, or on the entire surface except for the sealing portion 8 on the periphery of the vapor deposition layer 1 b, characters, pictures, coloring, or sales promotion effects such as product information on the contents of the packaging bag are provided. Provide a beautiful printing ink layer 2 such as a design pattern to be improved. Note that the printing ink layer 2 may be provided on an intermediate layer constituting the second laminated material B. The printing method of the printing ink layer 2 of the first laminated material A is flexographic printing or gravure printing, but a gravure printing method is preferable for beautiful printing. Gravure printing inks include dyes and pigments that impart color to the ink, vehicles that disperse and maintain the dyes and pigments in fine particles, and fix them to the printing medium, and auxiliary agents that improve the various physical properties of the ink. It consists of As the coloring material, a pigment having good light resistance is preferable. There are no particular restrictions on the resin that is the main component of the vehicle, regardless of whether it is a natural resin or a synthetic resin, as long as it is a resin that can be dissolved in an organic solvent and can be converted into a resin.For example, nitrocellulose, polyamide, and salt Arbitrary selection of vinyl acetate, urethane or chlorinated olefin resin. The organic solvent is not particularly limited as long as it can stably dissolve the resin, maintain the dispersibility of the pigment, maintain the fluidity of the ink, and transfer an appropriate amount of the ink from the printing plate. Solvents such as hydrocarbons, esters and ketones may be used alone or as a mixture of several solvents. Auxiliary agents are used to improve the ink performance by adding a small amount to the ink for gravure printing. The main purpose is to improve the dispersibility of the pigment, improve the color development, prevent precipitation, and improve the fluidity. It is common to add a plasticizer to add an activator or to improve the adhesion of the resin. The coating amount of the ink of the printing ink layer 2 may be the same as that of normal gravure printing, and the thickness thereof is preferably, for example, about 35 μm, which is the normal plate depth of gravure printing.

The support layer 4 of the first laminated material A is made of a synthetic resin. As the synthetic resin, a film similar to the base material 1a constituting the barrier layer 1 in the first laminated material A of the present invention is preferable. . 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 is as follows. Dry lamination method using adhesive, low density polyethylene (

An extrusion lamination method in which a resin melt-extruded using LDP E) resin, polypropylene (PP) resin, ethylene monoacetate copolymer (EVA) resin, ionomer resin, etc., serves as the adhesive layer 3 Further, there is a hot-melt lamination method using a hot-melt adhesive as the adhesive layer 3, and a dry lamination method is preferable in consideration of adhesiveness and heat resistance. The adhesive for dry lamination may be urethane, modified butadiene or alkyl titanate. When the extrusion lamination method is adopted, it is preferable to provide an anchor coat layer between the resin extruded 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 (MDP E) resin, and high-density polyethylene (HDPE). ) Unstretched polypropylene (CP P) resin, ionomer resin, ethylene-vinyl acetate copolymer (EVA) resin, ethylene-vinyl acetate copolymer (EVOH) resin, etc. can be used. High density polyethylene (HDPE) and unstretched polypropylene (CPPP) resin films are preferred. The thickness of the synthetic resin film used for the sealant layer 5 is preferably in the range of 20 μπι to 50 μm.

The method of providing the base material 1a constituting the barrier layer 1 and the deposition layer 1b provided on the base material 1a in the second laminated material B of the present invention is the same as that of the first laminated material A shown in FIG. 1a. Good.

The synthetic resin layer 6a constituting the oxygen absorbing layer 6 of the second laminate material B is made of ordinary polyethylene terephthalate (PET), polyamide resin, polypropylene A uniaxially or biaxially stretched film made of any one of the synthetic resins of the lenticular resin can be used.

There are various types of oxygen absorbers that can be mixed into the oxygen absorber layer 6b of the second laminated material B, such as an iron-based material. Any type is acceptable. However, in general, when kneading with a synthetic resin, an iron-based material which is economical in cost is preferable. These oxygen absorbers are roughly classified into iron-based and organic-based. Iron-based materials are further classified into iron-based or iron-based water-dependent types and air that absorb oxygen only when exposed to high humidity air. There is a self-reaction type that begins to absorb oxygen as soon as it is touched. Organic-based self-reaction types include ascorbic acid, ascorbate, vorphyrin complexes, and macrocyclic polyamine complexes.

The method of laminating the oxygen-absorbing layer 6, the barrier layer 1 and the sealant layer 5 of the second laminated material B is performed by laminating the support layer 4, the printing ink layer 2 and the sealant layer 5 of the first laminated material A. It may be the same as the one-stop method.

The film of the sealant layer 5 of the second laminated material B is preferably the same as that of 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-open function to the first laminated material A and the second laminated material B is not particularly limited, but is preferably a carbon dioxide gas laser beam.

(Example 1)

As a substrate 1 a of the barrier layer 1 of the first laminated material A shown in FIG. 1 a, a roll-shaped biaxially stretched polyester film having a thickness of 12 m was used, and a silicon oxide was formed on one surface of the substrate 1 a. The evaporated substance was evaporated and fixed by electron beam vacuum evaporation to form a deposited layer lb.

Next, a layer of urethane-based resin The gravure printing ink having a printing depth of 35 μιη was printed with gravure printing ink to form a printing ink layer 2.

Next, an ordinary urethane-based dry lamination adhesive is applied on the printing ink layer 2 with a gravure solid plate having a plate depth of 3 μμπι to a thickness of about 2 g Zm to form an adhesive layer 3. The support layer 4 made of a roll-shaped biaxially stretched nylon film having a thickness of 20 μm was laminated with a dry lamination method.

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 with a gravure solid printing plate having a plate depth of 3 μm 2 g Zm ^2. Then, an adhesive layer 3 was formed, and 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.

Further, as the base material 1a of the barrier layer 1 of the second laminated material B shown in FIG. 1b, as in the case of the base material 1a constituting the barrier layer 1 in the first laminated material A of the present invention, the thickness is 1 2 / m roll-shaped biaxially stretched polyester film, evaporating and fixing an evaporating substance composed of silicon oxide on one surface of the substrate 1a by an electron beam vacuum evaporation method, and forming a 40 nm-thick vapor deposition layer. 1b formed. Next, an ordinary urethane-based dry lamination adhesive is applied on one side of the vapor deposition layer 1b of the barrier layer 1 with a gravure solid plate having a plate depth of 30 m at a rate of about 2 g / m ² to adhere. Layer 3 was formed.

Next, on both sides of the oxygen absorbing layer 6 b, in which an iron-based oxygen absorbing agent is mixed with a synthetic resin made of a biaxially stretched polypropylene film, which has been prepared in a separate step, is formed on the adhesive layer 3 in advance. An oxygen absorbing layer 6 in which a synthetic resin layer 6a made of a stretched polypropylene film was laminated was 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 about 30 to a thickness of about 2 gZm ² to form an adhesive layer 3. Was laminated by a dry lamination method with a sealant 5 made of a roll-shaped unstretched polypropylene film having a thickness of 50 μm to prepare a second laminated material B.

As shown in FIG. 3, the sealant layer 5 formed on the first laminated material A and the second laminated material B is superimposed, and as shown in FIG. Processed.

Next, when heat seal type bag making processing is performed on the three-sided sealing portion 8, the barrier layer 1, which is the outer surface of the first laminated material A and the second laminated material B, has a predetermined shape such as a notch 7 in FIG. A carbon dioxide laser beam with an emission wavelength of 1.6 nm to the position is irradiated at a scanning speed of 300 mm / sec, a frequency of 10 kHz, and an output of 2 OW to 6 OW. Cut grooves having an easy-opening function were formed in the barrier layer 1 and the like except for the sealant layer of A and the second laminated material B.

Further, a packaging bag having an easy-opening function in which three sides having a size of 15 O mm × 20 O mm in size were heat-sealed by a force cutter unit was prepared.

(Example 2)

A vapor deposition material made of aluminum was oxidized and fixed by electron beam vacuum vapor deposition to form a vapor deposition layer of alumina having a thickness of 20 nm. Thus, three sides made heat-sealed packaging bags having an easy-opening function. '' Using the above packaging bag, seal the opening to make it a four-sided sealed state, and tear it from the kerf to confirm the easy-opening function of the completely sealed four-sided sealed packaging bag.Examples 1 and 2 Both could be opened very easily. Using the above packaging bag, fill the retort food, seal the opening to make it a four-sided seal, and tear it through the kerf to confirm the easy-opening function of the completely sealed four-sided sealing packaging bag with contents. In both cases, both Example 1 and Example 2 could be opened very easily.

Next, the oxygen permeability was measured as the barrier property of the packaging bag.

In both Example 1 and Example 2, the oxygen permeability before the kerf was provided by the laser beam was 0.5 m 1 / m 24 hr, and the oxygen permeability was 0.7 m 1 / m 24 h. results provided, the numerical value of the oxygen permeability of ^{1. 5m l Zm 2. 2 4} hr from 2. Om l / m · 24 hr, and the considerable oxygen Baria deterioration was observed.

Therefore, a packaging bag made by laminating the first laminated material A not including the oxygen absorbing layer 6 and the second laminated material B including the oxygen absorbing layer 6 with the sealant layer 5 on the inner surface, and further comprising the oxygen absorbing layer Using the packaging bags created with the first laminated material A not containing 6 and the sealant layer 5 as the inner surface, each of the packaging bags is purged with nitrogen, and the opening of the packaging bag is closed and completely closed. After retort sterilization of the nitrogen-filled four-side sealed packaging bag at 120 ° C for 30 minutes, it was stored for 2 months in an atmosphere of 40 ° C and 90% RH, and the oxygen concentration in the packaging bag was measured. The oxygen concentration in the packaging bags of Example 1 and Example 2 was 0 by combining the first laminated material A without the absorption layer 6 and the second laminated material B with the oxygen absorption layer 6, but the oxygen absorption layer The oxygen concentration in the packaging bag due to the combination of the first laminated materials A that do not contain 6 is 3. /. Met.

Industrial applicability

As described above, the packaging bag of the present invention is useful for a packaging bag having a kerf having an easy opening function, and can be used particularly for retort sterilization and autoclave sterilization, and has an oxygen barrier property. Suitable for excellent packaging bags.

Claims

The scope of the claims

A barrier layer formed by providing a vapor deposited layer on one side of a base material, a first laminated material including a sealant layer made of synthetic resin, a barrier layer formed by providing a vapor deposited layer on one side of the base material, and an oxygen absorber. An oxygen absorbent layer made of a synthetic resin mixed with oxygen and a second laminated material with a sealant layer made of a synthetic resin are stacked on top of each other with the sealant layer on the inside, and the periphery is heat-sealed. Featured packaging bags.

A support layer is provided on the vapor deposited layer of the first laminated material via an adhesive layer, further a sealant layer made of synthetic resin is provided on the upper surface of the support layer via the adhesive layer, and At least one oxygen-absorbing layer made of a synthetic resin mixed with an oxygen absorber is provided on the vapor-deposited layer of the two-layer material via an adhesive layer, and an oxygen-absorbing layer made of a synthetic resin mixed with an oxygen-absorbing agent is further provided on the top surface of the oxygen-absorbing layer via an adhesive layer. The packaging bag according to claim 1, further comprising a sealant layer made of synthetic resin.

3. The packaging bag according to claim 1 or 2, wherein the vapor-deposited layer of the first laminated material is formed by vapor-depositing a single metal.

3. The packaging bag according to claim 1 or 2, wherein the vapor-deposited layer of the first laminated material is formed by vapor-depositing an inorganic oxide.

The second laminated material is made up of a barrier layer made of a vapor deposited layer on one side of the base material, an oxygen absorbent layer made of a synthetic resin mixed with an oxygen absorber, and a sealant layer made of a synthetic resin. A composition in which an oxygen absorber is mixed into the vapor-deposited layer of the second laminated material via an adhesive layer, characterized in that the sealant layer is stacked on the inner surface and the periphery is heat-sealed. Synthetic resin layer and synthetic resin oxygen absorber layer made of resin Claim 5, characterized in that at least one oxygen absorbing layer is provided between the layers, and a sealant layer made of a synthetic resin is further provided on the upper surface of the oxygen absorbing layer with an adhesive layer interposed therebetween. Packaging bag as described in section.

7. The packaging bag according to claim 1 or 5, wherein the oxygen absorbent of the second laminated material is made of iron.

8. The packaging bag according to claim 1 or 5, wherein the vapor-deposited layer of the second laminated material is formed by vapor-depositing a single metal.

9. The packaging bag according to claim 1 or 5, wherein the vapor-deposited layer of the second laminated material is formed by vapor-depositing an inorganic oxide.

10. The packaging bag according to claim 1 or 5, characterized in that a printing ink layer is provided on the intermediate layer of the first laminated material and Z or the second laminated material.

1 1. Claim 1, characterized in that the first laminated material and Z or the second laminated material are provided with an opening groove in the laminated portion excluding the sealant layer from the barrier layer side. Packaging bags described in Section 1 or Section 5.

12. The packaging bag according to claim 11, wherein the cut grooves are formed using a carbon dioxide laser beam.