JP2012183659A - Transparent packaging bag having uv-screening property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transparent packaging bag for transparent exterior packaging, using a packaging material which combinedly has oxygen barrier and UV-screening properties and controls the occurrence of pinholes during transportation processes.SOLUTION: In the transparent packaging bag having UV-screening properties, which keeps three sides of a superimposed pile-up film sealed, and the opening sealed after contents are charged from the opening, the light transmittance of the pile-up film at the wavelength of 310 nm is ≤1%, and the pile-up film is used which includes at least a substrate film, a barrier film layer adhered to the substrate film by an extrusion laminate system using a polyolefin resin and a sealant film layer adhered to the barrier film layer.

Description

  The present invention relates to a packaging bag using a laminated packaging material having an oxygen barrier property and an ultraviolet blocking property, which is difficult to generate pinholes when packed and transported with a thickness and weight. The present invention relates to a packaging bag that can be used for packaging contents whose quality easily deteriorates due to the ingress of oxygen or ultraviolet rays.

Glass bottles that have been used as filling containers for medical chemicals have the disadvantages of being heavy, risk of damage due to impact, bulky and inconvenient to transport and store. Instead, soft bags or bag-like containers made of plastics such as polyethylene resin, polypropylene resin, and polyvinyl chloride resin are often used.
Furthermore, from the viewpoints of good handling (handling), lighter containers, and reduced volume of garbage, those filled in flexible plastic primary containers are increasing (see Patent Document 1).

Among the contents liquids filled in these containers, especially drugs such as amino acid liquids, sugars, and electrolyte liquids are remarkably deteriorated by oxygen, and vitamins are easily deteriorated by near-ultraviolet light.
On the other hand, since these drugs may be injected directly into the body, the plastic containers that are in direct contact with these drugs use additive-free plastic so that the drug will not be adversely affected by the elution of the components from them. In many cases, the used container is used.

However, a soft bag or bag-like container formed of an additive-free plastic is difficult to guarantee the high gas barrier property necessary for preventing the chemical solution from changing, such as a glass bottle.
Therefore, for example, when the infusion bag is left in the atmosphere, sunlight and near-ultraviolet light in a fluorescent lamp or oxygen in the atmosphere permeate the infusion bag and alter the drug over time.
Thus, in recent years, secondary packaging of a primary container filled with a chemical solution and sealed with an exterior bag having a high barrier property has been performed.

  Also in this method, when transporting a package containing medicines, foods, cosmetics, etc., the packaging bags, the packaging bag and the corrugated cardboard of the outer box come into contact with each other due to vibration, and a pinhole is formed in the packaging bag. Problems such as not only losing the appearance but also deteriorating the stored contents due to scratches on the bag were unavoidable.

  As a countermeasure against this problem, in Patent Document 4, as an improvement of the gas barrier outer bag for storing an infusion bag to prevent the chemical solution of the infusion bag from being altered, the shape of the outer bag is changed so that the width of the right and left edges of the bag is a bag. An outer packaging bag for storage has been proposed that has a shape that narrows toward the bottom of the bag, prevents rattling of the stored infusion bag, and stably maintains gas barrier properties.

Moreover, in the exterior bag currently shown by patent document 5, the horizontal cross-section opening size of the bag by the bag inner width of the bulging part formed in the adhesion margin on the right and left of the exterior bag is gradually decreasing downward. As a squeezing effect, the infusion bag that descends from the top opening is seated at the center position of the bag bottom in a posture without inclination. In other words, even if the infusion bag descends in a tilted position in the bag, it passes through the bulging portion, and the tilt is corrected and seated and stored in the center of the bag bottom, thus causing distortion of the outer bag. In addition, there is presented an exterior bag that does not prevent reliable bonding and sealing at the top edge.

Moreover, the infusion bag accommodated in the exterior bag is forcibly held at that position as an aperture restriction effect at the top of the bulging portion. For this reason, infusion bag vibration and shaking during transport and other handling processes, as well as bending deformation fatigue at the bottom of the bag (both causing the occurrence of pinholes in the outer bag and loss of gas barrier properties) It is said that suppression is prevented.
However, according to this method, there is a possibility that a cut piece generated by forming the corner portion of the film may not be completely removed from the product line and may be mixed as a foreign substance in the product.

In Patent Document 6, three sides of the overlapped gas barrier film are sealed, and after storing the infusion bag from the opening, in the infusion bag storage outer bag designed to seal and seal the opening, An outer bag for storing an infusion bag is proposed in which a three-side seal is formed by removing the corner region of the film.
However, in this method, only the corners are unsealed. Therefore, when a pitch shift occurs in the seal at the time of bag making or filling, the size of the unsealed portions varies and the desired effect is obtained. Most likely not.

  In Patent Document 7, aluminum is vacuum-deposited on stretched polypropylene, polyethylene, and stretched ethylene-vinyl alcohol copolymer in order to prevent the occurrence of pinholes due to bending due to vibration and the like and to improve the storage stability of the contents. A packaging material in which a film, an adhesive layer, and a linear low density polyethylene are laminated in this order has been proposed.

  Since this packaging material has a stretched ethylene-vinyl alcohol copolymer film layer deposited with aluminum, it has a high light-shielding property and oxygen barrier property, and the stiffness of the entire packaging material becomes soft, so that pinholes in bending are generated. It is said that the pinhole resistance to prevent is also improved.

  Furthermore, in Patent Document 8, as a light-shielding packaging material that has both oxygen barrier properties and light-shielding properties, and has excellent pinhole resistance and can maintain light-shielding properties even when the packaging material is bent and fatigued, a stretched polypropylene film, black There has been proposed a light shielding packaging material in which a polyolefin film, a vapor-deposited nylon film, and a polyolefin film are sequentially laminated, and an adhesive layer is provided between the respective layers, with little bending deterioration and excellent pinhole resistance.

Since these exterior bags proposed in Patent Documents 7 and 8 require barrier properties, plastic films coated with PVDC (polyvinylidene chloride) coating and EVOH (ethylene-vinyl alcohol copolymer) films , PVA (polyvinyl alcohol) film, PET (polyester terephthalate) film deposited with aluminum oxide or silicon oxide, stretched nylon film deposited with aluminum oxide or silicon oxide, EVOH layer, or barrier having MXD6 nylon layer as an intermediate layer A laminated packaging material using nylon or the like can also be used together (see Patent Documents 2 and 3). However, since these oxygen barrier films are transparent and have no light-shielding property, Aluminum foil or black film In combination is imparted a light-shielding property.
Since these materials that are opaque to visible light are laminated in order to prevent deterioration of the content liquid due to the penetration of light, it is difficult to visually confirm the contents stored in these exterior bags from the outside. Therefore, the type and abnormality of the contents could not be easily determined from the appearance.

For example, when an infusion bag filled with a high-calorie infusion solution consisting of amino acids, sugars, electrolytes, vitamins, etc. is placed in the infusion bag exterior bag for protection and then transported in a cardboard box, Due to this vibration, pinholes may be generated in the infusion bag exterior bag. In this case, the oxygen barrier property and the light shielding property cannot be maintained.
In order to easily determine abnormalities in these contents caused by vibration during the transportation process, it is desirable that the outer bag is somewhat transparent to visible light.

  Furthermore, as an exterior bag, measures to prevent pinholes due to bending fatigue of the bag, which is considered to be the main cause of pinholes generated during the transportation process, and wear pinholes due to wear of the packaging materials were required. .

JP 10-314272 A Japanese Patent Laid-Open No. 9-262943 Japanese Patent No. 3202541 Japanese Utility Model Publication No. 6-0777737 No. 8-6770 JP 2005-59566 A JP 2006-193196 A JP 2008-246893 A

  The present invention has been made to solve the above-described problems of the prior art, and by devising the layer configuration and processing method without deteriorating the appearance, the oxygen barrier property and the ultraviolet blocking property are achieved. Another object of the present invention is to provide a transparent outer packaging bag using a packaging material that has a pinhole in the transportation process and suppresses the generation of pinholes.

  The invention according to claim 1 of the present invention is a packaging bag in which three sides of a laminated film laminated are sealed, and after filling the contents from the opening, the opening is sealed and sealed. The laminated film has a light transmittance of 1% or less, and the laminated film is at least a base film, a barrier film layer bonded to the base film by an extrusion laminating method using a polyolefin resin, and the barrier film A transparent packaging bag having an ultraviolet blocking property, wherein a laminated film comprising a layer and a sealant film layer bonded together is used.

  The invention according to claim 2 of the present invention is a packaging bag in which three sides of the laminated film are sealed and filled with contents from the opening, and then the opening is sealed and sealed. The laminated film has a light transmittance of 1% or less, and the laminated film is coated with an ink containing at least an ultraviolet absorber, and the substrate film is formed by an extrusion laminating method using a polyolefin resin. A laminated film composed of a barrier film layer composed of a stretched film laminated with an inorganic oxide and a sealant film layer composed of an unstretched polyolefin resin bonded to the barrier film layer is used. It is the transparent packaging bag which has ultraviolet-blocking property.

  In the invention according to claim 3 of the present invention, the base film and the barrier film layer are laminated by extrusion lamination using a polyolefin resin, and the barrier film layer and the sealant film layer are dry laminate using a urethane adhesive. The transparent packaging bag having ultraviolet blocking properties according to claim 1 or 2, wherein the transparent packaging bag is laminated.

  In the transparent packaging bag having ultraviolet blocking properties according to the first to third aspects of the present invention, the three sides of the laminated film are sealed, and after filling the contents from the opening, the opening is sealed and sealed. In such a packaging bag, when the light transmittance of the laminated film at a wavelength of 310 nm is 1% or less, it is possible to block the light in the near ultraviolet region and prevent the contents from being deteriorated by the light.

  A substrate such as a stretched polypropylene resin film coated with an ink containing an ultraviolet absorber without using a layer opaque to visible light such as an aluminum vapor deposition layer or a black film to block light in the near ultraviolet region. By using a laminated film including a film, it is possible to obtain a transparent packaging bag having an ultraviolet blocking property that allows visual confirmation of the contents to be necessary.

  As the degree of ultraviolet blocking of this laminated film, it is desirable that the light transmittance at a wavelength of 310 nm is 1% or less, and this degree can be easily determined depending on the type and content of the ultraviolet absorber in the ink and the film thickness of the ink. Can be controlled. Furthermore, each layer other than the ink constituting the laminated film may have ultraviolet absorptivity.

In addition, the transparent packaging bag having ultraviolet blocking properties according to the present invention has a barrier film layer such as a stretched nylon film on which an inorganic oxide such as aluminum oxide is transparently deposited. It is possible to prevent the contents from being altered due to the ingress of gas such as oxygen or water vapor. As an initial degree of oxygen barrier property, it is desirable that the oxygen transmission rate is 10.0 ml / m ² / day / MPa (conforming to JIS K7126, temperature 30 ° C., humidity 70% RH) or less.

  The laminated film includes a base film having moderate flexibility such as a stretched polypropylene film and a barrier film layer bonded to the base film by an extrusion laminating method using a polyolefin resin such as a low density polyethylene resin. As a result, the stiffness of the entire packaging material becomes soft, so that the pinhole resistance in bending is also improved. For this reason, generation | occurrence | production of the pinhole by the bending | flexion based on a vibration etc. can be prevented, and it becomes possible to improve the content preservation property.

  As described above, according to the transparent packaging bag having the ultraviolet blocking property of the present invention, it has both an oxygen barrier property and a light blocking property in the near ultraviolet region, and is resistant to pinholes during the transportation process. It is possible to provide a transparent packaging bag for exterior using a packaging material having properties.

It is sectional explanatory drawing of the laminated | multilayer film used for the transparent packaging bag which has the ultraviolet-blocking property of this invention. It is sectional explanatory drawing which shows the state which accommodated the content using the transparent packaging bag which has the ultraviolet-blocking property of this invention as an exterior bag. It is sectional explanatory drawing of an example of the laminated film used for the transparent packaging bag which has the conventional ultraviolet-blocking property.

Hereinafter, embodiments for carrying out the present invention will be specifically described with reference to examples.
FIG. 1 is a cross-sectional explanatory view of a laminated film used in a transparent packaging bag having ultraviolet blocking properties of the present invention. The outside of the bag is shown as being upward in the figure.
The structure is from the outside from the base film (A), the ultraviolet absorbing ink layer (G), the extruded polyolefin resin layer (B), the barrier film layer (C), the adhesive layer (D), and the sealant film layer (E). Become.
FIG. 2 is a cross-sectional explanatory view showing a state in which the contents are accommodated using the transparent packaging bag having the ultraviolet blocking property of the present invention as an exterior bag.
FIG. 3 is a cross-sectional explanatory view of an example of a laminated film used for a transparent packaging bag having a conventional ultraviolet blocking property. Shown for reference.

As the base film (A), in addition to a biaxially stretched film of a polyester resin such as polyethylene terephthalate resin or polyethylene naphthalate resin, a polyamide such as nylon 6 resin, nylon 66 resin, or MXD6 (polymetaxylylene adipamide) resin. Resin biaxially stretched films, biaxially stretched polypropylene films, and the like can be used particularly suitably.
The base film (A) needs to be selected as a support for use as an outer bag and one that does not impair the flexibility of the entire outer bag.
A film having a thickness of 20 μm to 50 μm, which is a biaxially stretched propylene film and a monoaxially stretched polypropylene film, generally satisfies this condition.

As the ultraviolet absorbing ink layer (G) provided on the inner surface of the base film (A), a transparent ink for gravure printing (including a medium and a reducer) containing a normal ultraviolet absorber can be used.
The ultraviolet absorber can be appropriately selected from, for example, benzophenone, benzotriazole, salicylate, cyanoacrylate, formamidine, oxanilide, and the like.

Depending on the degree of transparency required for visible light, the type and amount of the UV absorber and the thickness of the ink layer can be set as appropriate, but the transparent ink is basically applied over the entire surface.
The light-shielding property of the ultraviolet-absorbing ink layer (G) is preferably 1% or less at a wavelength of 320 nm, as measured by a UV visible absorptiometer.

The extruded polyolefin resin layer (B) adheres the base film (A) and the barrier film layer (C). For example, a low density polyethylene resin is melted in one of the films (A) or (C). The other film (C) or (A) is laminated and adhered before extrusion coating and solidifying. Such an extruded polyolefin resin layer (B) can be appropriately selected from commercially available low density polyethylene resins.
The thickness of the extruded resin layer is desirably about 10 μm to 30 μm. Prior to melt extrusion coating of the extruded polyolefin resin layer (B), an anchor coat layer (AC) may be provided on the extruded surface of the film.

Barrier film layer (C) includes films of saponified ethylene / vinyl acetate copolymer, polyvinylidene chloride, polyacrylonitrile, etc., transparent deposited layers of inorganic oxides such as silica and alumina, and coated films of polyvinylidene chloride A biaxially stretched nylon film provided with a layer, a biaxially stretched polyethylene terephthalate film, a biaxially stretched polypropylene film, or the like can be used. These barrier film layers impart oxygen barrier properties to the packaging material, and care must be taken so as not to impair the flexibility of the entire packaging material.
The gas barrier property of the barrier film may be such that the oxygen permeability according to JIS K7126 is 10.0 ml / m ² / day / MPa (30 ° C., 70% RH) or less. The thickness is desirably 12 μm to 30 μm.

The adhesive layer (D) bonds the barrier film layer (C) and the sealant film layer (E), and is not particularly limited as long as it is a commercially available two-component curable urethane-based adhesive, and the thickness is 3
About μm is desirable. The adhesive layer (D) may be a melt-extruded layer using an extruded polyolefin resin such as a low density polyethylene resin. The thickness of the extruded resin layer is desirably about 10 μm to 30 μm. Prior to melt extrusion coating, an anchor coat layer (AC) may be provided on the extrusion surface of the film.

The sealant film layer (E) is a layer to be bonded by heat sealing when a packaging bag is made, and a polyolefin film having heat-fusibility is usually used. The thickness is preferably about 40 μm to 100 μm.
For the sealant film layer, in addition to low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene -An acrylic ester copolymer, ionomer, polypropylene, or a copolymer thereof can be used.
For the lamination of the sealant film layer, a method of forming the above resin into a film and laminating by a dry lamination method or an extrusion lamination method, or a method of extruding and laminating the above resin can be employed. However, in the case where the content easily penetrates into the sealant layer, it is preferable to laminate by the dry lamination method.

  And this laminated film can be made into a three-side seal bag, a four-side seal bag, etc., and it can be set as the transparent packaging bag which has the ultraviolet-blocking property which concerns on this invention. Bag making is possible in a normal process by superimposing each other with the sealant film layer (E) on the inside and heat-sealing the necessary parts. FIG. 2 is an explanatory view showing a state in which the bag (2) containing the liquid as the contents (F) is accommodated in the outer bag thus produced.

<Example 1>
A biaxially stretched polypropylene film (Tosero Co., Ltd., trade name: UB-1) having a thickness of 30 μm is used as a base film, and UV absorbing ink (Toyo Ink Manufacturing Co., Ltd., trade name: N532LPUV clear) is used with a gravure printing machine. ) With a film thickness of 1 μm, and using an extrusion laminating machine, a 15 μm-thick alumina vapor-deposited nylon film (Toppan Printing Co., Ltd., trade name: GL-AEY) and a thickness of 15 μm as a barrier layer on the ink surface. The laminated film bonded together through the low density polyethylene resin of was produced.

  A urethane-based adhesive (Mitsui Takeda Chemical Co., Ltd., A-525 / A-52) is applied to the barrier layer surface of the laminated film with a dry film thickness of 3 μm using a dry laminating machine, and the sealant film layer has a thickness of 60 μm. A linear low-density polyethylene film (Tosero Co., Ltd., trade name: TUX-FCX) was laminated to prepare a transparent packaging material for use in the transparent packaging bag having ultraviolet blocking properties of the present invention.

<Example 2>
A biaxially stretched polypropylene film (Tosero Co., Ltd., trade name: UB-1) with a thickness of 30 μm is used as a base film, and UV absorbing ink (DIC Graphics Co., Ltd., trade name: UV cut) with a gravure printing machine. Medium) with a film thickness of 1 μm, and using an extrusion laminating machine, a 15 μm-thick alumina vapor-deposited nylon film (Toppan Printing Co., Ltd., trade name: GL-AEY) and a thickness on the ink surface. A laminated film bonded through a 15 μm low density polyethylene resin was prepared.

  On the barrier layer surface of this laminated film, a low-density polyethylene resin with a thickness of 60 μm as a sealant film layer is passed through a low-density polyethylene resin with a thickness of 15 μm using an extrusion laminator (Tosero Co., Ltd., trade name: TUX- The transparent packaging material used for the transparent packaging bag which has the ultraviolet shielding property of this invention which bonded FCX) was produced.

<Comparative Example 1>
A biaxially stretched polypropylene film (Tosero Co., Ltd., trade name: UB-1) having a thickness of 30 μm is used as a base film, and UV absorbing ink (Toyo Ink Manufacturing Co., Ltd., trade name: N532LPUV clear) is used with a gravure printing machine. ) Is coated on the entire surface with a film thickness of 1 μm, and using a dry laminating machine, a 15 μm thick alumina-deposited nylon film (Toppan Printing Co., Ltd., trade name: GL-AEY) and a dry thickness is used as a barrier layer on the ink surface. A laminated film was prepared by bonding through a 3 μm urethane adhesive (Mitsui Takeda Chemical Co., Ltd., A-525 / A-52).

  A urethane-based adhesive (Mitsui Takeda Chemical Co., Ltd., A-525 / A-52) is applied to the barrier layer surface of the laminated film with a dry film thickness of 3 μm using a dry laminating machine, and the sealant film layer has a thickness of 60 μm. A transparent low-density polyethylene film (Tosero Co., Ltd., trade name: TUX-FCX) was laminated to prepare a transparent packaging material for use in a transparent packaging bag having ultraviolet blocking properties.

<Comparative example 2>
A biaxially stretched polypropylene film (Tosero Co., Ltd., trade name: UB-1) having a thickness of 30 μm is used as a base film, and UV absorbing ink (Toyo Ink Manufacturing Co., Ltd., trade name: N532LPUV clear) is used with a gravure printing machine. ) Is coated on the entire surface with a film thickness of 1 μm, and using a dry laminating machine, a 15 μm thick alumina-deposited nylon film (Toppan Printing Co., Ltd., trade name: GL-AEY) and a dry thickness is used as a barrier layer on the ink surface. A laminated film was prepared by bonding through a 3 μm urethane adhesive (Mitsui Takeda Chemical Co., Ltd., A-525 / A-52).

  A linear low density polyethylene film having a thickness of 60 μm as a sealant film layer (Tosero Co., Ltd., trade name: TUX-) is formed on the barrier layer surface of the laminated film through a low density polyethylene resin having a thickness of 15 μm using an extrusion laminating machine. The transparent packaging material used for the transparent packaging bag which has ultraviolet shielding property which bonded FCX) was created.

Prepare 30 bags of three-sided seal bags with dimensions 310mm width 265mm height using the transparent packaging material used in the transparent packaging bags having ultraviolet blocking properties prepared in Examples 1 and 2 and Comparative Examples 1 and 2 above. It was set as the exterior bag, and the interior bag filled with 1 L of the content liquid was packed in each exterior bag and then sealed to obtain a package.
The light transmittance measured by the UV-visible absorptiometer of the packaging materials prepared in Examples and Comparative Examples was 1% or less at a wavelength of 320 nm.
The above package was packed into 3 cardboard boxes, 10 bags each, and a vibration test was performed by the following method.

<Vibration test>
Vibration tester: Two-way switching type vibration tester manufactured by Shinken Co., Ltd. Vibration conditions: ± 4 G (11 Hz), total 60 minutes (vertical direction 30 minutes + vertical 15 minutes + horizontal 15 minutes)
Evaluation method: Create 310mm x 265mm outer bag, wrap the inner bag filled with 1L of content liquid, load and pack in the same way as the current product, conduct vibration test under the above conditions, The number of pinholes was counted (10 bags / 1 cardboard).
The results are shown in Table 1.

From the above results, the packaging bag using the packaging material created in Examples 1 and 2 has reduced pinholes in the vibration test compared to the packaging bag using the packaging material created in Comparative Examples 1 and 2. I understand. The pinhole generation rate in the actual transportation process is on the order of ppm, and the number of pinholes is zero in all configurations in the vibration test method according to JIS standards. Furthermore, if it is a structure like an Example, it can provide the packaging bag with few pinhole generation | occurrence | production bags and having high oxygen barrier property.

  The transparent packaging bag having ultraviolet blocking property of the present invention has a barrier property capable of preventing deterioration with respect to the primary package used for contents easily deteriorated by the entry of oxygen from the outside and near ultraviolet light. It is useful for use in an outer bag such as an infusion bag.

DESCRIPTION OF SYMBOLS 1 ... Transparent packaging bag which has ultraviolet-blocking property 2 ... Interior bag A ... Base film (stretched polypropylene film)
B ... Extruded polyolefin resin layer (low density polyethylene layer)
C ... Barrier film layer (inorganic oxide vapor deposition film)
D: Adhesive layer E: Sealant film layer (unstretched polyolefin film)
F ... Contents liquid G ... UV-absorbing ink layer B '... Dry lamination adhesive layer

Claims (3)

  In a packaging bag in which three sides of the laminated film are sealed and filled with contents from the opening, and the opening is sealed and sealed, the light transmittance of the laminated film at a wavelength of 310 nm is 1%. The laminated film comprises at least a base film, a barrier film layer bonded to the base film by an extrusion laminating method using a polyolefin resin, and a sealant film layer bonded to the barrier film layer. A transparent packaging bag having an ultraviolet blocking property, wherein a laminated film is used.   In a packaging bag in which three sides of the laminated film are sealed and filled with contents from the opening, and the opening is sealed and sealed, the light transmittance of the laminated film at a wavelength of 310 nm is 1%. The base film on which the laminated film is coated with an ink containing at least an ultraviolet absorber and the inorganic oxide bonded to the base film by an extrusion laminating method using a polyolefin resin is transparently deposited. A transparent packaging bag having an ultraviolet blocking property, comprising a laminated film comprising a barrier film layer comprising a stretched film and a sealant film layer comprising an unstretched polyolefin resin bonded to the barrier film layer. .   The base film and the barrier film layer are laminated by extrusion lamination using a polyolefin resin, and the barrier film layer and the sealant film layer are laminated by dry lamination using a urethane-based adhesive, The transparent packaging bag which has the ultraviolet-blocking property of Claim 1 or 2.

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