JP6898703B2 - Packaging film and packaging - Google Patents

Description

The present invention relates to a film for a packaging body and a packaging body.

In recent years, there have been increasing opportunities for containerized preparations containing preparations containing glucose, amino acids, vitamins, fats, etc. in plastic infusion bags. Since the preparation may be altered by oxygen gas, the infusion bag containing the preparation is required to have an oxygen gas barrier property. Further, when the oxygen gas barrier property of the infusion solution bag is not sufficient, the infusion solution bag is housed in an outer body having an excellent oxygen gas barrier property. As described above, the infusion bag and its outer body (hereinafter, collectively referred to as "infusion package") are required to have an oxygen gas barrier property.
The infusion packaging is transported, stored, etc. until it is used. If pinholes or the like are generated by rubbing the package during transportation or storage, or cracks or the like are generated by dropping the package, oxygen gas invades from the pinholes or cracks and deteriorates the contents. Or the contents leak. Therefore, the infusion package is required to be less prone to pinholes and the like due to rubbing (scratch resistance) and less likely to be cracked and the like to be impacted by dropping (impact resistance).
Further, the infusion package is required to have visibility that allows the type and quality of the contents to be easily confirmed.
As a packaging material having excellent pinhole resistance, Patent Document 1 describes an oxygen-blocking property composed of at least an ethylene-vinyl alcohol copolymer film and a composite film in which two layers of biaxially stretched nylon films sandwiching the film are laminated. Transparent packaging materials are disclosed. Further, as a packaging material having excellent impact resistance, Patent Document 2 describes an oxide-deposited film and a barrier coat layer on one surface of a base film made of polyester produced by using a titanium-based catalyst as a polycondensation catalyst. , And a gas barrier vapor-deposited film in which heat-sealing resin layers are laminated in this order are disclosed.

Japanese Unexamined Patent Publication No. 9-262943 Japanese Unexamined Patent Publication No. 2009-132061

By the way, infusion bags are frequently used in medical settings such as hospitals. Therefore, the infusion package is required to be easily opened by hand without using scissors or a knife from the viewpoint of usability and safety. Further, if the package is torn in an unintended direction at the time of opening, the contents are scattered, which is not preferable in terms of hygiene. Therefore, it is required that the package can be opened in the intended direction at the time of opening. That is, the infusion package is required to be easy to open so that it can be easily opened by hand and can be opened in a intended direction.
However, in Patent Documents 1 and 2, easy opening is not considered.
The present invention has been made in view of the above circumstances, and an object of the present invention is a film for a packaging body which is excellent in scratch resistance, impact resistance, transparency of contents, and easy opening property.

As a result of diligent studies, the present inventors have found that the following film for packaging can solve the above problems.
That is, the packaging film of the present invention has the following constitution.
[1] A base material layer having a water vapor barrier property and an oxygen barrier property, a sealant layer, and an adhesive layer arranged between the base material layer and the sealant layer are provided, and the base material layer is inorganic. A layer of vapor-deposited nylon or a layer of biaxially stretched polypropylene is provided on the surface, the thickness of the adhesive layer is 4.0 μm or less, the thickness of the sealant layer is 30 to 80 μm, and the base material layer and the sealant. A film for a packaging body having an adhesive strength with a layer of 3 N / 15 mm or more and a water vapor permeability of 0.7 to 3.0 g / m ^2.
[2] The base material layer includes a biaxially stretched polypropylene layer, an ethylene-vinyl alcohol polymer layer, an inorganic vapor-deposited biaxially stretched nylon layer, or an inorganic vapor-deposited biaxially stretched polyethylene terephthalate layer. The film for a packaging body according to [1], which comprises a layer of axially stretched polypropylene on the surface.
[3] The film for a packaging body according to [1] or [2], which is used for the exterior of an infusion bag.
[4] A packaging body in which the packaging film according to any one of [1] to [3] is made into a bag.

The film for a packaging body of the present invention is excellent in scratch resistance, impact resistance, transparency of contents, and easy opening property.

It is sectional drawing of the film for a packaging body which concerns on 1st Embodiment of this invention. It is sectional drawing of the film for a packaging body which concerns on 2nd Embodiment of this invention.

The film for a packaging body of the present invention includes a base material layer, a sealant layer, and an adhesive layer arranged between the base material layer and the sealant layer.
Hereinafter, the packaging film of the present invention will be described with reference to embodiments.

(First Embodiment)
The film for a package according to the first embodiment of the present invention will be described with reference to the drawings.

[Film for packaging]
In the packaging film 1 of FIG. 1, the base material layer 10, the adhesive layer 30, and the sealant layer 20 are laminated in this order. That is, the packaging film 1 includes a base material layer 10, a sealant layer 20, and an adhesive layer 30 arranged between the base material layer 10 and the sealant layer 20.
The thickness T ₁ of the packaging film 1 is not particularly limited, but is preferably 40 to 250 μm, more preferably 50 to 200 μm, and even more preferably 60 to 150 μm, for example. If it is less than the above lower limit value, the strength of the packaging film 1 may decrease, and if it exceeds the above upper limit value, the flexibility of the packaging film 1 may decrease and handling may become complicated.

Water vapor permeability of the wrapping material film 1 is ^{0.7~3.0g / (m 2 · 24h)} . When the water vapor permeability is less than ^{0.7g / (m 2 · 24h)} , when the package with the bag manufacturing a wrapping material film 1, dew condensation in the headspace of the package occurs, the contents of Transparency is impaired. When the water vapor permeability is 3.0g / (m 2 · ^24h) than can not be sufficiently suppressed moisture from entering from the outside of the package, alteration of the contents, it is difficult to suppress degradation.
Water vapor permeability of the wrapping material film 1 is ^{0.7~3.0g / (m 2 · 24h)} , 1.0~2.7g / (m 2 · 24h) are preferred.
In order to prevent dew condensation that occurs in the head space of the package, it is conceivable to add an antifogging agent to the film for the package. However, in this case, migration of the antifogging agent to the contents may occur. In the present invention, by setting the water vapor transmission rate of the packaging film 1 within a specific range, dew condensation that occurs in the head space of the packaging is prevented without adding an antifogging agent to the packaging film 1, and the contents. The transparency of things can be improved.
The water vapor transmission rate in the present invention is a value obtained by the Mocon method of JIS K7129 (2008).

The oxygen permeability of the packaging film 1 is preferably 5 cm ³ / (m ² · atm · 24 h) [= 4.94 cm ³ / (m ² · MPa · 24 h)] or less, preferably 3 cm ³ / (m ² · atm). 24h) [= 2.96cm ³ / (m ² · MPa · 24h)] or less is more preferable, 1cm ³ / (m ² · atm · 24h) [= 0.987cm ³ / (m ² · MPa · 24h) ] The following is more preferable. If it is less than the above upper limit value, it becomes easy to suppress deterioration and deterioration of the contents.
The oxygen permeability in the present invention is a value obtained by the Mokon method of JIS K7126-2.

The total light transmittance of the packaging film 1 is preferably 65% or more, more preferably 75% or more, still more preferably 85% or more. When the total light transmittance is equal to or higher than the lower limit value, the visibility of the contents is enhanced. In the present invention, the total light transmittance indicates a value measured in accordance with JIS K7136.

<Base material layer 10>
The base material layer 10 has a water vapor barrier property and an oxygen barrier property.
The base material layer 10 includes a biaxially stretched polypropylene layer (OPP layer) 12 and an oxygen barrier layer 14.
_{The thickness T 10} of the base material layer 10 is determined in consideration of the water vapor transmission rate, oxygen permeability, strength and the like of the packaging film 1, and is preferably 5 to 100 μm, more preferably 10 to 50 μm, for example. If it is less than the above lower limit value, the strength of the packaging film 1 may decrease, and if it exceeds the above upper limit value, the flexibility of the packaging film 1 may be impaired and handling may become complicated.

≪OPP layer 12≫
The OPP layer 12 is located on the surface of the packaging film 1. Biaxially stretched polypropylene (OPP) is excellent in impact resistance such as drop strength. Further, OPP has an excellent tribological effect, is less likely to be worn when sliding with other members, and suppresses the generation of frictional heat. By providing the OPP layer 12 on the surface of the packaging film 1, the impact resistance and scratch resistance are enhanced.
In addition, OPP has a water vapor barrier property. By providing the OPP layer 12 on the packaging film 1, the packaging film 1 is provided with a water vapor barrier property.
The thickness _{T 12} of the OPP layer 12, scratch resistance, impact resistance, but is appropriately set in consideration of the wrapping material film 1 of the water vapor transmission rate and the like, for example, 10 to 50 [mu] m are preferred, 15~35μm More preferred.

Known additives such as antistatic agents and lubricants may be added to the OPP layer 12. As a result, the tribological effect of the OPP layer 12 is further enhanced.
Further, water vapor permeability of the OPP layer ^{12, 0.7~3.0g / (m 2 · 24h} ) are ^{preferred, 1.0~3.0g / (m 2 · 24h} ) are preferred, 1.5 to 2 .7g ^/ (m 2 · 24h) and more preferable. When the water vapor transmission rate of the OPP layer 12 is in the above-mentioned preferable range, it becomes easy to adjust the water vapor transmission rate of the packaging film 1 to the range of the present invention.

The OPP layer 12 preferably has an orientation degree α in the MD direction (flow direction when producing a film) of 0.5 to 2.5, more preferably 0.7 to 2.0, and 1.0 to 1.5. Is even more preferable. If it is at least the above lower limit value, the ease of opening is further enhanced. If it is not more than the upper limit value, the impact resistance is further enhanced.
The OPP layer 12 preferably has an orientation β in the TD direction (direction perpendicular to the MD direction) of 0.2 to 2.5, more preferably 0.5 to 2.0, and more preferably 0.7 to 1.5. preferable. If it is at least the above lower limit value, the ease of opening is further enhanced. If it is not more than the upper limit value, the impact resistance is further enhanced.
The ratio represented by the degree of orientation α / degree of orientation β (hereinafter, may be referred to as α / β ratio) is preferably 0.5 to 2.0, and more preferably 0.5 to 1.5.

The degree of orientation α and the degree of orientation β are calculated from the values measured by the infrared two-color method.
The degree of orientation is measured by a transmission method using light called linearly polarized light in which the electric field of light vibrates only in a certain direction in an infrared spectrophotometer.
As a measuring method, first, BKG (background) measurement is performed with the polarizing element installation angle set to 0 ° (the direction of the electric field is the vertical direction), and then the stretching direction of the sample is adjusted to the vertical direction, and the absorbance is measured ( At this time, the polarization direction and the extension axis direction are parallel.) The obtained value is defined as the absorbance "A //".
Next, the angle of the sample is rotated by 90 °, and the absorbance is measured with the stretching axis of the sample and the polarization direction perpendicular to each other. The obtained value is defined as the absorbance "A⊥".
The degree of orientation is defined as the absorbance ratio of the two absorbances A // and A⊥ obtained by polarized light parallel to the stretching axis of the sample and polarized light perpendicular to the stretching axis of the sample.
The wave number to be measured in the infrared two-color method is appropriately selected according to the material to be measured ("Yasuji Kobayashi," Molecular Orientation by Infrared Two-Color Method ", Journal of the Society of Polymer Science," Polymer ", Vol. 15, Vol. No. 175, p. 877-883 ”).
Further, the degree of orientation can be easily obtained from the tensile elastic modulus measured according to JIS K7127 (1999).

≪Oxygen barrier layer 14≫
The packaging film 1 includes an oxygen barrier layer 14. Examples of the resin constituting the oxygen barrier layer 14 include ethylene-vinyl alcohol polymer (EVOH), inorganic vapor-deposited biaxially stretched nylon (inorganic vapor deposition ONY), and inorganic vapor-deposited biaxially stretched polyethylene terephthalate (inorganic vapor-deposited biaxially stretched PET). And so on.
These resins may be used alone or in combination of two or more.
Further, the vapor-deposited film such as inorganic-deposited ONY or inorganic-deposited biaxially stretched PET may be combined with a resin coat such as an acrylic coat.

_{The thickness T 14} of the oxygen barrier layer 14 is determined in consideration of the material, composition, and the like. When an inorganic thin-film film is used as the oxygen barrier layer 14, the T ₁₄ is preferably, for example, 6 to 20 μm, more preferably 9 to 15 μm. When a resin film is used as the oxygen barrier layer 14, the T ₁₄ is preferably, for example, 10 to 30 μm, more preferably 12 to 20 μm. If it is less than the lower limit value, the oxygen barrier property may be lowered, and if it exceeds the upper limit value, the flexibility of the packaging film 1 may be impaired and handling may be complicated.
An adhesive layer may be provided between the OPP layer 12 and the oxygen barrier layer 14. By providing the adhesive layer, the integrity of the OPP layer 12 and the oxygen barrier layer 14 is further enhanced, and the impact resistance is further enhanced. As the adhesive layer, the same material as the adhesive layer 30 described later is used. The thickness of the adhesive layer is not particularly limited, but is preferably 1 to 5 μm, more preferably 2 to 4 μm.

<Sealant layer 20>
The sealant layer 20 has a role of enhancing the sealing property of the packaging film 1.
Examples of the resin constituting the sealant layer 20 include low density polyethylene (LDPE), linear LDPE (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene (PP), and ethylene-butene-1. Polyethylene such as copolymer, EVOH, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethylacrylate copolymer (EAA) EEA), ionomer, etc. can be mentioned. These resins may be used alone or in combination of two or more.

The thickness _{T 20} of the sealant layer 20 is 30 to 80 [mu] m. If T ₂₀ is less than 30 μm, sufficient impact resistance cannot be obtained. If T ₂₀ is more than 80 μm, the ease of opening is impaired. T ₂₀ is preferably 30 to 70 μm, more preferably 35 to 65 μm, and even more preferably 40 to 60 μm.
The sealant layer 20 may have a single-layer structure or a multi-layer structure.

<Adhesive layer 30>
The adhesive layer 30 is arranged between the base material layer 10 and the sealant layer 20. The adhesive layer 30 has a role of enhancing the adhesiveness between the base material layer 10 and the sealant layer 20.
Conventionally known materials can be used as the material constituting the adhesive layer 30, and for example, adhesives such as polyurethane-based, polyester-based, epoxy-based, polyvinyl acetate-based, and acid-modified polyolefin-based, titanate-based, and polyurethane-based materials can be used. , Polyethyleneimine-based, polybutadiene-based anchor coating agents and the like.
These materials may be used alone or in combination of two or more.

The thickness _{T 30} of the adhesive layer 30 is less 4.0 .mu.m. The sealant layer 20 in contact with the adhesive layer 30 usually has flexibility (stretchability). If the adhesive layer 30 is too thick (more than 4.0 μm), the adhesive layer 30 follows the sealant layer 20 when the package is opened, the linear cut property of the sealant layer 20 is hindered, and the opening direction cannot be fixed. ..
T ₃₀ is preferably 3.5 μm or less, more preferably 3.0 μm or less, and even more preferably 2.5 μm or less.
The lower limit of T ₃₀ is not particularly limited as long as the adhesive state between the base material layer 10 and the sealant layer 20 is maintained, but is preferably 0.001 μm or more, more preferably 0.01 μm or more, for example.

The adhesive strength between the base material layer 10 and the sealant layer 20 is 3N / 15 mm or more. If the adhesive strength between the base material layer 10 and the sealant layer 20 is less than 3N / 15 mm, sufficient impact resistance cannot be obtained. Further, it becomes difficult to control the opening direction of the package, and the linear cut property is impaired. The adhesive strength between the base material layer 10 and the sealant layer 20 is preferably 5N / 15 mm or more, and more preferably 7N / 15 mm or more. When the adhesive strength between the base material layer 10 and the sealant layer 20 is at least the above lower limit value, the sealant layer 20 is likely to break following the propagation of the opening force of the base material layer 10, so that the easy opening property is likely to be improved. Become.
The adhesive strength between the base material layer 10 and the sealant layer 20 can be easily adjusted by adjusting the type of adhesive constituting the adhesive layer 30 and the blending ratio of the main agent and the curing agent.

[Manufacturing method of film 1 for packaging]
The packaging film 1 is manufactured according to a conventionally known manufacturing method.
Examples of the manufacturing method of the packaging film 1 include the following manufacturing method A.

<Manufacturing method A>
The manufacturing method A includes a step of obtaining the base material layer 10 (base material layer manufacturing step), a step of obtaining the sealant layer 20 (sealant layer manufacturing step), and an adhesive layer 30 between the base material layer 10 and the sealant layer 20. Is provided, and a step (lamination step) of laminating the base material layer 10 and the sealant layer 20 is provided.

The method for obtaining the base material layer 10 in the base material layer manufacturing step is selected from conventionally known methods such as an inflation method, a T-die method, and a coextrusion method, depending on the material and composition of the base material layer 10.

The method for obtaining the sealant layer 20 in the sealant layer manufacturing step is selected from conventionally known methods according to the material and composition of the sealant layer 20.
The method for obtaining the sealant layer 20 is selected from conventionally known methods such as a coextrusion method using a T-die coextruder, an inflation coextruder, or the like.

Examples of the method of laminating the base material layer 10 and the sealant layer 20 in the laminating step include a method of applying an adhesive to one surface of the base material layer 10 and drying it, and then crimping the sealant layer 20.

[Packaging]
The package of the present embodiment is the one in which the film 1 for the package of the present embodiment is used. Examples of the packaging body include a bag made by heat-sealing the sealant layers 20 of the packaging film 1 to each other. Examples of the form of the package include a gassho-pasted bag, a three-way sticker bag, a four-way sticker bag, a gusset bag, a stand bag, and the like.
Further, when the package is a three-way seal bag, a four-way seal bag, or the like, it is preferable that the inside of the corner portion of the seal provided along the side side is subjected to R seal processing. When the package is R-sealed, the impact resistance and scratch resistance are further enhanced.

When the package of the present embodiment is used as an infusion bag, the package is filled with a preparation containing glucose, amino acids, vitamins, fat and the like to prepare a container-filled preparation. When the pharmaceutical product in a container is used in a medical field or the like, the infusion bag may be torn to fill another container with the contents, or the contents may be used without tearing the bag. Good. When the contents are used without tearing the bag, it is preferable that the infusion bag is provided with a mechanism for taking out the contents such as a spout in advance.
When the package of the present embodiment is used as the outer body of the infusion bag, the outer body is torn when the infusion bag is used in a medical field or the like, and the infusion bag is used.

As described above, the packaging film 1 of the present embodiment is excellent in scratch resistance, impact resistance, transparency of the contents, and easy opening property. Therefore, the packaging film 1 of the present embodiment is suitable as a packaging film for foods, chemicals, etc., and more suitable as a packaging film for infusion. Above all, it is suitable as a film for the exterior body of an infusion bag.
The package made from the package film of the present embodiment is excellent in scratch resistance, impact resistance, transparency of the contents, and easy opening. Therefore, the packaging body made from the packaging film of the present embodiment is suitable as a packaging body for foods, chemicals, etc., and is more suitable as a packaging body for infusion solution. Above all, it is suitable as an exterior body of an infusion bag.

(Second embodiment)
The packaging film 100 according to the second embodiment of the present invention will be described with reference to the drawings.
[Film for packaging]
In the packaging film 100 of FIG. 2, the base material layer 110, the adhesive layer 130, and the sealant layer 120 are laminated in this order. That is, the packaging film 100 includes a base material layer 110, a sealant layer 120, and an adhesive layer 130 arranged between the base material layer 110 and the sealant layer 120.
In the present embodiment, the difference from the first embodiment is that the base material layer 110 has a single-layer structure and the sealant layer 120 has a two-layer structure.

The thickness _{T 100} of the wrapping material film 100 is the same as the thickness _{T 1} of the wrapping material film 1.
The water vapor transmission rate of the packaging film 100 is the same as the water vapor transmission rate of the packaging film 1.
The oxygen permeability of the packaging film 100 is the same as the oxygen permeability of the packaging film 1.
The total light transmittance of the packaging film 100 is the same as the total light transmittance of the packaging film 1.

<Base material layer 110>
The base material layer 110 is composed of an inorganic thin-film nylon layer (inorganic-deposited NY layer). Inorganic-deposited nylon (inorganic-deposited NY) is excellent in impact resistance such as drop strength. Further, the inorganic thin-film NY has an excellent tribological effect, is less likely to be worn when sliding with other members, and suppresses the generation of frictional heat. By providing the surface of the package film 100 with an inorganic thin-film NY layer, impact resistance and scratch resistance are enhanced.
Inorganic vapor deposition NY has a water vapor barrier property and an oxygen barrier property. By providing the packaging film 100 with an inorganic thin-film NY layer, the packaging film 100 is imparted with water vapor barrier properties and oxygen barrier properties.
Examples of the inorganic thin-film NY include alumina-deposited nylon with alumina deposited, silica-deposited nylon with silica deposited, and the like. Further, as the inorganic thin-film NY, inorganic-deposited biaxially stretched nylon (inorganic-deposited ONY) is preferable. Inorganic vapor deposition ONY is excellent due to the tribological effect, and scratch resistance and the like are further enhanced. Further, the vapor-deposited film may be combined with a resin coat such as an acrylic coat.
_{The thickness T 110} of the base material layer 110 is appropriately set in consideration of scratch resistance, impact resistance, water vapor transmission rate and oxygen permeability of the packaging film 100, and is preferably 8 to 30 μm, for example. , 10 to 20 μm is more preferable.

The degree of orientation α of the base material layer 110 is the same as the degree of orientation α of the OPP layer 12.
The degree of orientation β of the base material layer 110 is the same as the degree of orientation β of the OPP layer 12.
The α / β ratio of the base material layer 110 is the same as the α / β ratio of the OPP layer 12.

<Sealant layer 120>
The sealant layer 120 is the same as the sealant layer 20 except that it is composed of two layers, a first sealant layer 122 and a second sealant layer 124.
LLDPE is preferable as the resin constituting the first sealant layer 122. LDPE is preferable as the resin constituting the second sealant layer 124.

The thickness T ₁₂₀ of the sealant layer 120 is the same as the thickness T ₂₀ of the sealant layer 20.
_{The thickness T 122} of the first sealant layer 122 is preferably 20 to 60 μm, more preferably 30 to 50 μm. _{The thickness T 124} of the second sealant layer 124 is preferably 5 to 30 μm, more preferably 10 to 20 μm.

<Adhesive layer 130>
The adhesive layer 130 is arranged between the base material layer 110 and the sealant layer 120. The adhesive layer 130 has a role of enhancing the adhesiveness between the base material layer 110 and the sealant layer 120.
Examples of the material constituting the adhesive layer 130 include the same materials as those of the adhesive layer 30. An anchor coating agent is preferable as the material constituting the adhesive layer 130.
The thickness T ₁₃₀ of the adhesive layer 130 is the same as the thickness T ₃₀ of the adhesive layer 30.
The adhesive strength between the base material layer 110 and the sealant layer 120 is the same as the adhesive strength between the base material layer 10 and the sealant layer 20.

[Manufacturing method of film 100 for packaging]
The packaging film 100 can be manufactured in the same manner as in the above-mentioned manufacturing method A, and is also manufactured by, for example, the following manufacturing method B (sandwich laminating method).
<Manufacturing method B>
The manufacturing method B (sandwich laminating method) includes a step of obtaining the base material layer 110 (base material layer manufacturing step), a step of obtaining the first sealant layer 122 (first sealant layer manufacturing step), and a base material layer 110. A step of forming the adhesive layer 130 on one surface (adhesive layer forming step) and a molten resin for forming the second sealant layer 124 on the adhesive layer 130 are supplied to form the second sealant layer 124. A step (lamination step) of laminating the base material layer 110, the adhesive layer 130, the second sealant layer 124, and the first sealant layer 122 is provided.

The method of obtaining the base material layer 110 in the base material layer manufacturing step is the same as the method of obtaining the base material layer 10 in the base material layer manufacturing step of the packaging film 1.

The method of obtaining the first sealant layer 122 in the first sealant layer manufacturing step is the same as the method of obtaining the sealant layer 20 in the sealing layer layer manufacturing step of the packaging film 1.

In the adhesive layer forming step, an anchor coating agent is applied to one surface of the base material layer 110 and dried to form the adhesive layer 130.

In the laminating step, the molten resin forming the second sealant layer 124 is supplied on the adhesive layer 130 provided on one surface of the base material layer 110. Next, the first sealant layer 122 is sent onto the molten resin from another unwinding machine or the like, and the base material layer 110 and the first sealant layer 122 are pressure-bonded and cooled to cool the second sealant layer 124. To form. As a result, the base material layer 110, the adhesive layer 130, the second sealant layer 124, and the first sealant layer 122 are laminated.

[Packaging]
The packaging body of the present embodiment is the same as the packaging body of the first embodiment except that the packaging film 100 of the present embodiment is used.

According to the packaging film of the present embodiment, the same effect as that of the packaging film 1 of the first embodiment can be obtained. Further, in the packaging film 100 of the present embodiment, the oxygen barrier layer is omitted, so that the manufacturing cost is suppressed. In addition, the manufacturing process is simplified.

(Other embodiments)
In the packaging film 1 of the first embodiment, the base material layer 10 has a two-layer structure of an OPP layer 12 and an oxygen barrier layer 14, but the present invention is not limited to this. For example, a layer such as a water vapor barrier layer may be provided between the OPP layer 12 and the oxygen barrier layer 14 or between the oxygen barrier layer 14 and the adhesive layer 30. Examples of the material constituting the water vapor barrier layer include OPP, inorganic vapor deposition NY, and inorganic vapor deposition PET.
Further, in the packaging film 100 of the second embodiment, the base material layer 110 is a single layer composed of an inorganic thin-film NY layer, but the present invention is not limited to this. One or more layers such as an oxygen barrier layer and a water vapor barrier layer may be provided between the inorganic thin-film NY layer and the adhesive layer 130.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to the following examples.
The materials used in this example are as follows.

(Material used)
<Base layer>
-OPP: Pipe wrench film-OT (trade name), manufactured by Toyobo Co., Ltd.
-Alumina vapor deposition NY: Eco-Cial VN (trade name), manufactured by Toyobo Co., Ltd.
≪Oxygen barrier layer≫
-EVOH: EVAL (trade name), manufactured by Kuraray Co., Ltd.
-Alumina vapor deposition PET: Eco-Cial VE (trade name), manufactured by Toyobo Co., Ltd.
<Sealant layer>
-LLDPE: Rix (trade name), manufactured by Toyobo Co., Ltd.
-LDPE: Polystar LD (trade name), manufactured by Star Plastic Industry Co., Ltd.
<Base layer (comparative component)>
-PET: Lumirror (trade name), manufactured by Toray Film Processing Co., Ltd.
-CPP (unstretched polypropylene): Trefan 3931 (trade name), manufactured by Toray Film Processing Co., Ltd.

(Examples 1 to 6, Comparative Examples 1 to 7)
The surface layer, oxygen barrier layer and sealant layer shown in Table 1 were laminated to produce a film for a packaging body according to the configurations of Examples 1, 3, 4 and 6 and Comparative Examples 1 to 7.
The packaging film of Examples 2 and 5 was produced by the above-mentioned production method B (sandwich laminating method). The LDPE in the sealant layer of the packaging film of Examples 2 and 5 corresponds to the second sealant layer, and the LLDPE corresponds to the first sealant layer.
However, Example 2 is a reference example.

(Evaluation method)
Using the packaging film obtained in each example, a flat bag having a size of 200 mm × 230 mm was prepared. 350 g of water was put into this flat bag, and the opening was sealed with a heat seal to prepare a sample for evaluation.
The scratch resistance, impact resistance, visibility of the contents, and easy opening property (opening force, straight cut property) of this evaluation sample were evaluated as follows. The evaluation results are shown in Table 2.

[Evaluation of scratch resistance]
The scratch resistance of the evaluation sample was evaluated by a vibration test. The vibration test was performed in accordance with JIS Z0200-8.4.3. The test conditions were as follows.
Frequency: 1G / 10Hz.
Vibration direction and vibration time: 30 minutes each in the X, Y, and Z directions.
After the vibration test, those with no leakage of contents were evaluated as "◎", and those with leakage of contents were evaluated as "x".

[Evaluation of impact resistance]
The impact resistance of the evaluation sample was evaluated by a drop test. The drop test was performed in accordance with JIS Z0200-8.5.5.2. The test conditions were as follows.
An evaluation sample placed horizontally from a height of 80 cm is dropped on the concrete surface. This operation is repeated 3 times. Next, an evaluation sample placed perpendicularly to the concrete surface is dropped from a height of 80 cm. This operation is repeated 3 times.
After the drop test, those with no leakage of contents were evaluated as "◎", and those with leakage of contents were evaluated as "x".

[Evaluation of visibility of contents]
The visibility of the contents of the evaluation sample was evaluated as follows.
The evaluation sample was stored for 24 hours in an environment with a temperature of 40 ° C. and a humidity of 75% RH. The total light transmittance of the evaluation sample after storage was measured and evaluated based on the following evaluation criteria. The total light transmittance is a value measured according to JIS K7136. It can be evaluated that the higher the value of the total light transmittance, the better the visibility of the contents.
≪Evaluation criteria for transparency of contents≫
⊚: Total light transmittance is 85% or more.
◯: Total light transmittance is 65% or more and less than 85%.
Δ: Total light transmittance is 50% or more and less than 65%.
X: Total light transmittance is less than 50%.

[Evaluation of easy opening]
<Evaluation of opening power>
The opening force of the evaluation sample was evaluated by the tear strength test. The tear strength test was conducted in accordance with JIS Z71281, and the opening force was evaluated based on the following evaluation criteria.
≪Evaluation criteria for opening power≫
⊚: The tearing load is small (3N or less), and the load during tearing is stable.
◯: Although the tearing load is small (3N or less), the load fluctuates during tearing.
Δ: The tearing load is large (more than 3N), but the load during tearing is stable.
X: The tearing load is large (more than 3N), and the load fluctuates during tearing.

<Evaluation of straight line cutability>
When the evaluation sample is torn under the same conditions as the above <evaluation of opening force>, the difference between the position of the incision at the start of tearing and the position of the incision when the tear propagation reaches 100 mm (difference in height from the bottom surface). Was measured, and the linear cutability was evaluated based on the following evaluation criteria. It can be evaluated that the smaller this difference is, the better the linear cut property is.
≪Evaluation of straight line cutability≫
⊚: The difference between the position of the cut end when the tear starts and when the tear propagation reaches 100 mm is within 20 mm.
X: The difference between the position of the cut end when the tear propagation starts and when the tear propagation reaches 100 mm is more than 20 mm.

[Comprehensive evaluation]
In the evaluation of scratch resistance, impact resistance, visibility of contents, and easy opening property, those without "△" or "×" are evaluated as "◎", and one "△" or "×" is used. Those with the above were given a comprehensive evaluation of "x".

As shown in Table 2, the packaging body using the packaging body film of Examples 1 to 6 to which the present invention is applied is excellent in scratch resistance, impact resistance, visibility of contents, and easy opening property. It could be confirmed.
On the other hand, when a packaging film having a PET film on the surface (Comparative Example 1) was used, sufficient scratch resistance could not be obtained. When a film for a package (Comparative Example 2) having a water vapor transmission rate lower than the range of the present invention was used, the visibility of the contents could not be sufficiently obtained. When a packaging film (Comparative Example 3) in which the thickness of the sealant layer exceeded the range of the present invention was used, sufficient easy-opening property (opening force and linear cut property) could not be obtained. When a packaging film (Comparative Example 4) in which the thickness of the sealant layer was less than the range of the present invention was used, sufficient impact resistance could not be obtained. When a packaging film (Comparative Example 5) in which the thickness of the adhesive layer exceeds the range of the present invention was used, easy-opening property (straight line cutting property) could not be sufficiently obtained. When a packaging film having a CPP film on the surface (Comparative Example 6) was used, scratch resistance, impact resistance, and easy opening property (opening force and straight cut property) could not be sufficiently obtained. When a packaging film (Comparative Example 7) in which the adhesive strength between the base material layer and the sealant layer is less than the range of the present invention is used, impact resistance and easy-opening property (opening force and straight cut property) can be sufficiently obtained. There wasn't.
From the above results, it was confirmed that by applying the present invention, a film for a packaging body having excellent scratch resistance, impact resistance, visibility of contents, and easy opening property can be obtained.

1,100 Packaging film 10, 110 Base material layer 20, 120 Sealant layer 30, 130 Adhesive layer

Claims (4)

A base material layer having a water vapor barrier property and an oxygen barrier property, a sealant layer, and an adhesive layer arranged between the base material layer and the sealant layer are provided.
The base material layer includes a biaxially stretched polypropylene layer, an ethylene-vinyl alcohol polymer layer, an inorganic vapor-deposited biaxially stretched nylon layer, or an inorganic vapor-deposited biaxially stretched polyethylene terephthalate layer, and the biaxially stretched polypropylene. With a layer of
The base material layer does not contain an adhesive resin layer and does not contain an adhesive resin layer.
The layer provided on the surface of the base material layer has an orientation degree α in the MD direction of 0.5 to 2.5.
The layer provided on the surface of the base material layer has a degree of orientation β in the TD direction of 0.2 to 2.5.
The thickness of the adhesive layer is 4.0 μm or less, and the thickness of the adhesive layer is 4.0 μm or less.
The thickness of the sealant layer is 35 to 60 μm, and the thickness of the sealant layer is 35 to 60 μm.
The adhesive strength between the base material layer and the sealant layer is 3N / 15 mm or more.
Water vapor permeability is ^{0.7~3.0g / (m 2 · 24h)} , a wrapping material film. A base material layer having a water vapor barrier property and an oxygen barrier property, a sealant layer, and an adhesive layer arranged between the base material layer and the sealant layer are provided.
The base material layer includes a layer of inorganic thin-film nylon or a layer of biaxially stretched polypropylene on the surface thereof.
The base material layer does not contain an adhesive resin layer and does not contain an adhesive resin layer.
The layer provided on the surface of the base material layer has an orientation degree α in the MD direction of 0.5 to 2.5.
The layer provided on the surface of the base material layer has a degree of orientation β in the TD direction of 0.2 to 2.5.
The thickness of the adhesive layer is 4.0 μm or less, and the thickness of the adhesive layer is 4.0 μm or less.
The thickness of the sealant layer is 35 to 60 μm, and the thickness of the sealant layer is 35 to 60 μm.
The adhesive strength between the base material layer and the sealant layer is 3N / 15 mm or more.
Water vapor permeability is ^{0.7~3.0g / (m 2 · 24h)} ,
A film for packaging, which is used for the exterior of infusion bags. The packaging according to claim 1 or 2, wherein the layer provided on the surface of the base material layer has a ratio represented by the degree of orientation α / the degree of orientation β of 0.5 to 2.0. Body film. A package in which the film for a package according to any one of claims 1 to 3 is made into a bag.

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