JP7166749B2 - packaging bag - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging bag that uses a laminated film and is less likely to cause pinholes or the like.

A packaging bag using a film is a container that uses a small amount of materials such as plastic to be used and can pack a large volume.
However, packaging bags that improve gas barrier properties while maintaining transparency are laminated films that use hard and highly rigid materials such as ethylene-vinyl alcohol copolymer film and polyvinylidene chloride-coated polyethylene terephthalate film. was common to use. During operations such as mailing and storage, such packaging bags do not come into contact with each other or with other containers such as cardboard boxes, and the weight of the upper packaging bag is added to the lower packaging bag. The packaging bag is partially bent due to being hung and pushed. Due to such contact and bending, external injuries, bag breakage, pinholes, etc. occur, and problems such as a significant decrease in marketability have occurred.

In order to solve such a problem, Patent Document 1 proposes an exterior bag in which a packaging bag filled with contents is packed into a larger packaging bag.
This outer bag is an outer bag for storage with a narrow inner width at the inner edge of the lower half region, and is designed to control the large movement of the inner packaging bag inside the outer bag. .
However, such an exterior bag has a problem that it is difficult to take out when it is unsealed, and that it is difficult to take out when it is unsealed.

Furthermore, in Patent Document 2, a continuum that can continuously produce exterior bags by cutting superimposed film strips along a planned cutting line in the width direction,
A plurality of lateral seal portions are formed on the film strip at intervals in the longitudinal direction thereof, and side seal portions are formed on both sides along the longitudinal direction of the film strip,
The position of the planned cutting line is shifted with respect to the sealing portion in the width direction so that the opening of the outer bag is formed on the longitudinal side of the film strip when cut along the planned cutting line,
The side seal portions are formed in contact with the outer edges of the film band, and a non-seal portion is formed in both end regions of the side seal portions in the width direction of the intended cutting line.

Outer bags produced in this continuous form have non-sealed parts at four corners. It is hard to be damaged.
However, it can be improved against contact with the cardboard box that packs the entire product, damage due to impact such as bumping during loading and unloading during transportation, and pinholes caused by bending of the lower packaging bag during loading. As a result, problems such as liquid leakage and oxidation due to pinholes occurred, not the method.

Japanese Utility Model Publication No. 8-6770 Japanese Patent No. 4317404

Accordingly, it is an object of the present invention to obtain a packaging bag that has transparency, has scratch resistance in the outer layer, and has less occurrence of pinholes.

The present invention relates to a packaging bag in which the sealant layers of the laminated film are combined and the peripheral edge is sealed to be sealed,
The laminated film is composed of a substrate layer, a barrier layer, and a sealant layer in this order from at least the outside,
The base material layer is made of a biaxially oriented polypropylene film,
The barrier layer is a film having a biaxially stretched film and a deposited layer of an inorganic metal or inorganic oxide deposited on the surface of the biaxially stretched film ,
The sealant layer consists of low density polyethylene,
The packaging bag is characterized in that the substrate layer and the vapor-deposited surface of the barrier layer are laminated via a melt-extruded sandwich resin layer of ethylene copolymer resin.

Since the packaging bag of the present invention uses a biaxially oriented polypropylene film as the base material layer, it has high scratch resistance and high flexibility, and is not only resistant to damage, but also resistant to damage to the surrounding packaging bag. Flexible.
Furthermore, since the barrier layer is a deposited layer of inorganic metal or inorganic oxide, it is transparent, has high flexibility, and is less likely to be damaged by surrounding objects.
Furthermore, since the base material layer and the barrier layer are laminated via the ethylene copolymer, the packaging bag is not strongly bent, is soft, and hardly causes pinholes.

It is a front view which shows an example of the packaging bag in the example of 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a first configuration example of a laminated film used in the packaging bag of the present invention; FIG. 10 is a front view showing an example of a packaging bag according to the second embodiment of the present invention; FIG. 3 is a schematic cross-sectional view showing a second embodiment configuration example of the laminated film used for the packaging bag of the present invention. 1 is a plan view and a cross-sectional view schematically showing a state in which an easy-open processing line is formed by pores of a base material in the laminated film used for the packaging bag in the first configuration example of the present invention; FIG. FIG. 4A is a plan view and a cross-sectional view schematically showing a state in which an easy-to-open processing line is formed by remelting in the laminated film used for the packaging bag in the first configuration example of the present invention. FIG. 11 is a front view showing an example of a packaging bag in a third embodiment of the invention; FIG. 11 is a front view showing an example of a packaging bag in a fourth embodiment of the invention; FIG. 3 is a diagram showing a state in which the packaging bag in the first embodiment of the present invention is filled with an infusion bag;

A first embodiment of the packaging bag of the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a front view showing an example of the packaging bag 1 of the present invention.
The sealant surfaces of the front film 101 and the back film 102 face each other, and the left side 12, the right side 13, and the bottom 14 are fused together. Side 11 is fused and packaged.
A left notch 21 and a right notch 22 are provided above the left side surface 12 and the right side surface 13, and an easy-to-open processing line 23 connects them. Either one of the left cutout 21 and the right cutout 22 may be provided as the cutout.
When opening the notch and the easy-open processing line 23, hold the upper and lower sides of the notch to tear the notch, maintain the state where the tearing has started, continue tearing along the easy-open processing line 23, and open the packaging bag. It can be opened from above.
Of course, the packaging bag 1 may be such that the front film 101 and the back film 102 are formed of one sheet of laminated film, and the bottom portion 14 is simply folded.

FIG. 2 is a schematic cross-sectional view showing a first embodiment configuration example of the laminated film used for the packaging bag of the present invention.
The laminated film constituting the packaging bag 1 is composed of a substrate layer 3, a barrier layer 4, and a sealant layer 5 in this order from the outside.

Here, the substrate layer is made of a biaxially oriented polypropylene film. The thickness can be appropriately used within the range of 5 to 100 μm, preferably 20 to 50 μm.
The polypropylene used for the biaxially oriented polypropylene film here also includes an ethylene/propylene copolymer.
This base material layer has high scratch resistance and high flexibility, and is not only scratch-resistant, but also flexible enough to prevent the surrounding packaging bag from being scratched.

The barrier layer is an inorganic metal such as aluminum, or an inorganic oxide such as silicon oxide or alumina, and is composed of a thin vapor deposited layer produced by vapor deposition on the surface of the biaxially stretched film using a vapor deposition apparatus. .
Therefore, it is transparent, highly waterproof, and highly flexible.
As the biaxially stretched film used for the barrier layer, a biaxially stretched polyamide film, a biaxially stretched polyethylene terephthalate film, a biaxially stretched polypropylene film, or the like can be used. Its thickness is in the range of 5 to 100 μm, preferably 10 to 30 μm, and can be used appropriately.

The sealant layer can be made of high-pressure low-density polyethylene or linear low-density polyethylene, and has high fusibility.

The substrate layer 3 and the deposition surface of the barrier layer 4 are laminated via a melt-extrusion sandwich resin layer of ethylene copolymer resin. As the ethylene copolymer, any one of an ethylene/vinyl acetate copolymer, an ethylene/carboxylic acid ester copolymer, an ethylene/carboxylic acid copolymer, or a copolymer or mixture thereof can be used.
Of course, maleic anhydride-based ethylene copolymers having a plurality of adjacent carboxylic acids are also included.
Ionomer resins based on copolymers of ethylene and unsaturated carboxylic acid and neutralized with metals can also be used, and acrylic acid-based copolymers having ethylene and carboxylic acid are also included.
Therefore, resins such as ethylene-methyl methacrylate, ethylene-methyl acrylate, ethylene-ethyl acrylate, ethylene-butyl acrylate, ethylene-cyclohexyl acrylate and ethylene-glycidyl-di-methacrylate can also be used.
Since the ethylene copolymer resin layer 6 has high flexibility and high conformability, even if the laminated film constituting the packaging bag is bent, pinholes and the like are unlikely to occur easily. , and does not degrade the storage performance of the packaging bag such as peeling.

FIG. 3 is a front view showing an example of a packaging bag in the second embodiment of the invention.
Two films, the front film 101 and the back film 102, are placed face to face with the sealant surface side, and the intermediate film 141 is inserted between the front film 101 and the back film 102 by bending the sealant surface side outward. , the bottom portion 14 is sealed to form an expandable bottom surface to increase capacity.
A thin laminated film may be used as the intermediate film 141, or the same laminated film as the front film 101 and the back film 102 may be used.

FIG. 7 is a front view showing an example of a packaging bag in the third embodiment of the invention.
In this example, the front film 101 and the back film 102 are composed of one sheet of laminated film, are folded at the bottom 14, face each other on the sealant side, and seal the left side 12 and the right side 13. FIG.

FIG. 8 is a front view showing an example of a packaging bag according to the fourth embodiment of the invention.
A front film 101 and a back film 102 are composed of one laminated film, and a vertical seal 15 is provided so that the sealant surfaces at both left and right ends face each other. This is an example of a shape.
A back notch 24 is provided above the vertical seal so that it can be opened along an easy-to-open processing line 23. - 特許庁

FIG. 4 is a schematic cross-sectional view showing a second embodiment configuration example of the laminated film used for the packaging bag of the present invention.
The laminated film constituting the packaging bag 1 is composed of a substrate layer 3, an ethylene copolymer layer 6, a barrier layer 4, a melt extrusion coated polyolefin resin layer 7, and a sealant layer 5 in this order from the outside.
A tandem extruder lamination machine is used to extrude a molten polyolefin resin between the film for the barrier layer 4 and the film for the sealant layer 5, sandwiching and laminating them without an adhesive.
If the sealant is low-density polyethylene and the barrier layer 4 is a vapor deposition layer, it can be easily adhered with a melted polyolefin resin.
As the olefin resin used for the melt extrusion coated polyolefin resin layer 7, low density polyethylene, polypropylene, medium density polyethylene, high density polyethylene, ethylene/propylene copolymer, ethylene/vinyl acetate copolymer, etc. can be used. High-pressure low-density polyethylene and linear low-density polyethylene, which have high adhesiveness and flexibility, are preferred.

FIG. 5 is a plan view schematically showing the laminated film used for the packaging bag in the first structural example of the present invention, in which the easy-open processing lines 23 are formed in the base material layer 3 by the pores 31; It is a sectional view.
This easy-to-open processing line 23 is formed of pores 31 penetrating the base material layer 3 by laser or press, and the pores 31 are formed in a straight line at small intervals.
Moreover, since only the substrate layer 3 is perforated and the barrier layer 4 is not perforated, the barrier property is maintained.
Since the pores 31 are formed in a straight line at small intervals, when a tearing force is applied to the left notch 21 or the right notch 22 formed at the end of the easy-to-open processing line 23, the closest A crack runs through the base material layer 3 between the pores, it is torn, and then it is chained and torn.
In this way, the upper portion of the packaging bag can be torn along the easy-open processing line to open a hole.

FIG. 6 is a laminated film used for a packaging bag in the second embodiment configuration example of the present invention. 1 is a plan view and a cross-sectional view schematically represented. FIG.
This easy-to-open processing line 23 is formed by partially remelting the resin film whose molecules are aligned in one direction by biaxial stretching of the base material layer 3 by irradiation with scanning laser light, etc., and canceling the stretching. As a result, the orientation of the molecules becomes rough, resulting in a molecular structure with random orientation.
The random remelted easy-to-open processing lines 23 are formed in a straight line. Moreover, since the base material layer 3 itself is not perforated, it is kept in good condition with little decrease in strength and barrier properties.
Since the orientation of the molecules in the remelted portion 32 is random, the resistance to the tearing force is small, and it can be easily torn.
Since the remelting portion 32 is formed in a straight line and the orientation of the molecules is random, when a tearing force is applied to the left notch 21 or the right notch 22 formed at the end of the easy-open processing line 23, the A crack runs through the remelted portion 32 and is torn, and then it is torn along the easy-to-open processing line so that the packaging bag can be opened.

FIG. 9 is a diagram showing a state in which the packaging bag 1 is filled with the infusion bag 9 according to the first embodiment of the present invention.
The infusion bag 9 is provided with a spout 91 through which a needle is inserted and a hanging hook hole 92 for hanging the infusion bag, and is folded.

<Example 1>
A 50 μm-thick inner corona discharge-treated biaxially oriented polypropylene (FOS, manufactured by Futamura Chemical Co., Ltd.) was used as the base layer. A pattern was printed on the inner surface by a gravure printing machine, and fine holes of φ0.15 mm penetrating the front and back were straightly opened at a pitch of 0.3 mm as an easy-to-open processing line.
As a barrier layer, a 12 μm-thick polyethylene terephthalate film (JC-V8 manufactured by Oike Pack Material Co., Ltd.) deposited with aluminum was used.
Using a tandem extruder lamination machine, a 20 μm thick ethylene/vinyl acetate copolymer (Evaflex manufactured by Mitsui DuPont Polychemicals Co., Ltd.) is placed between the inner surface of the base material layer and the deposition surface of the barrier layer. (Registered Trademark) AN4221C) was extruded in a melted state using a T-die and bonded together.
Furthermore, using a tandem extruder lamination machine, the polyethylene terephthalate surface of the laminated film of the base material layer and the barrier layer laminated above and the linear low-density polyethylene film with a thickness of 50 μm as a sealant layer (manufactured by Tohcello Co., Ltd.) TUX-FCS), a 20 μm-thick low-density polyethylene (Novatec (registered trademark) LC600A manufactured by Japan Polyethylene Co., Ltd.) is extruded in a molten state with a T-die and laminated to create a laminated film for packaging bags. , 340 mm long and 300 mm wide.

<Example 2>
A tandem extruder lamination machine is used between the base material layer and the barrier layer, and a 20 μm-thick carboxylic acid ester copolymer (Elvaloy (registered trademark) AN4333C manufactured by DuPont Mitsui Polychemicals Co., Ltd.) is melted with a T-die. It was then extruded and pasted together. Otherwise, in the same manner as in Example 1, a laminated film for a packaging bag was prepared, cut into a rectangular shape of 340 mm long and 300 mm wide, and processed into the packaging bag shown in FIG.

<Example 3>
Between the substrate layer and the barrier layer, a tandem extruder lamination machine is used to melt a 20 μm-thick carboxylic acid ester copolymer (Elvaloy (registered trademark) N1108C manufactured by DuPont Mitsui Polychemicals Co., Ltd.) with a T-die. It was then extruded and pasted together.
Otherwise, in the same manner as in Example 1, a laminated film for a packaging bag was prepared, cut into a rectangular shape of 340 mm long and 300 mm wide, and processed into the packaging bag shown in FIG.

<Example 4>
Using a tandem extruder lamination machine, a 20 μm-thick ionomer (Himilan (registered trademark) 1652 manufactured by DuPont Mitsui Polychemicals Co., Ltd.) was extruded in a melted state with a T-die between the base material layer and the barrier layer, pasted together.
Otherwise, in the same manner as in Example 1, a laminated film for a packaging bag was prepared, cut into a rectangular shape of 340 mm long and 300 mm wide, and processed into the packaging bag shown in FIG.

<Comparative Example 1>
Using a tandem extruder lamination machine, an ethylene-vinyl acetate copolymer (Evaflex manufactured by Mitsui DuPont Polychemicals Co., Ltd. (registered (trademark) AN4221C) was extruded in a melted state using a T-die and bonded together.
For this reason, a film having a thickness of 20 μm was placed between the deposition surface of the laminated film of the laminated base layer and the barrier layer and a linear low-density polyethylene film (TUX-FCS manufactured by Tohcello Co., Ltd.) having a thickness of 50 μm as the sealant layer. (Novatec (registered trademark) LC600A manufactured by Japan Polyethylene Co., Ltd.) was extruded in a melted state using a T-die, sandwiched, and laminated.
Otherwise, in the same manner as in Example 1, a laminated film for a packaging bag was prepared, cut into a rectangular shape of 340 mm long and 300 mm wide, and processed into the packaging bag shown in FIG.

<Comparative Example 2>
Using a dry lamination machine, a polyurethane adhesive (manufactured by Mitsui Chemicals, Inc. Takelac (registered trademark) A-626/Takenate (registered trademark) A- 50 aliphatic ester-based two-liquid curing type) was applied and bonded.
Otherwise, in the same manner as in Example 1, a laminated film for a packaging bag was prepared, cut into a rectangular shape of 340 mm long and 300 mm wide, and processed into the packaging bag shown in FIG.

<Contents of evaluation test>
Thirty packaging bags each having the above configuration were prepared, each packaging bag was filled with a 1-liter infusion solution bag, and the upper surface was sealed to prepare a test sample as shown in FIG.

Vibration test: 10 bags each filled with infusion bags were packed in a corrugated cardboard box, and a vibration test was performed.
The vibration tester uses a two-way switching vibration tester.
The vibration conditions were 4G11Hz, 30 minutes in the vertical direction, 15 minutes in the vertical direction, and 15 minutes in the horizontal direction for a total of 60 minutes.

Easy-to-open processing line cutting linearity Hold both the top and bottom of the notch at the end of the easy-to-open processing line, tear the packaging bag from the notch, and the torn tear line will tear linearly along the easy-to-open processing line. I checked visually.

Oxygen permeability measurement: Measured according to JIS K 7126-2 using a MOCON oxygen permeability measuring device OX-TRAN (registered trademark) 2/21 manufactured by Hitachi High-Tech Science Co., Ltd.

Measurement of residual solvent: Cut the laminated film into a 100 mm square, fold it, put it in a 20 ml vial, heat it at 80 ° C. for 20 minutes by gas chromatography (7890A manufactured by Agilent Technologies), and measure the volatilized residual solvent. amount was measured.

<Packaging bag evaluation test results>
In the vibration test, there was no breakage of the bag or generation of pinholes in either the Examples or the Comparative Examples.
However, peeling between the film layers did not occur in Examples 1, 2, 3, 4 and Comparative Example 2, but in Comparative Example 1 the aluminum deposition surface was on the sealant side. It was difficult to protect them, and 12 of them were generated.
In addition, although the surface was scraped off in Example 1, Example 2, Example 3, Example 4 and Comparative Example 1, 20 pieces occurred in Comparative Example 2. In Comparative Example 2, it is considered that the adhesion of the aluminum vapor-deposited surface was lowered by the adhesive.
Thus, Comparative Example 2 had a problem that the packaging bag was easily damaged in the vibration test.

In the easy-open processing line cutting linearity, the tear line torn from the notch at the end of the easy-open processing line was All of them were confirmed to be cut linearly along the easy-open processing line.

The oxygen permeability was 0.5 cc/m ² ·day·atm with no difference between the examples and the comparative examples, confirming the oxygen barrier property.

The residual solvent was as small as 1 mg/m ² in Examples 1, 2, 3, 4 and Comparative Example 1. However, in Comparative Example 2, the residual solvent content was 5 mg/m ² , and since an adhesive was used, it was confirmed that the amount of residual solvent was five times as large.

From the above results, Comparative Example 1 had problems with film interlaminar strength and surface damage, and Comparative Example 2 had problems with surface damage and residual solvent.
However, the packaging bag of the present invention, which is an example, did not have problems such as vibration test, opening property, oxygen barrier property, residual solvent, etc. assuming transportation, and predetermined performance was confirmed.

本発明は以上のように、透明性があって、外層の耐傷性、ピンホールの発生等が少なく、内容物を傷めずに保存できる包装袋である。
酸素バリア性や水蒸気バリア性も高く、環境の変化によって内容物も変質しにくく、長期保存性能も有している。
直線的な易開封加工線を有しているので、一回で確実に開封可能であり、開封作業に無駄を生じにくく、すばやく内容物を取り出すことができる。
さらに、量産性も高く、安価で、開封性も容易であり、本発明のメリットは大きい。

INDUSTRIAL APPLICABILITY As described above, the present invention provides a packaging bag that is transparent, has a scratch-resistant outer layer, has little pinholes, and can store contents without damaging them.
It has high oxygen barrier properties and water vapor barrier properties, and the contents are resistant to deterioration due to changes in the environment, and it also has long-term storage performance.
Since it has a straight easy-to-open processing line, it can be reliably opened at one time, and the unsealing operation is not wasteful, and the contents can be taken out quickly.
Further, the present invention has great merits because it is highly mass-producible, inexpensive, and easy to open.

Reference Signs List 1: Packaging bag 101: Front film 102: Back film 11: Upper surface 12: ..left side 13..right side 14..bottom 141..intermediate film 15..back seal 21.. ..Left notch 22..Right notch 23..Easily open processing line 24..Back notch 3.. . . . Base material layer 31 .. Pores 32 . ... Sealant layer 6 ... Ethylene copolymer layer 7 ... Melt extrusion coated polyolefin resin layer 9 ... Contents (infusion bag)
91 .... Pour out part 92 ........ Hanging hook hole

Claims (6)

In a packaging bag that can be sealed by combining the sealant layers of the laminated film and sealing the peripheral edge,
The laminated film is composed of a substrate layer, a barrier layer, and a sealant layer in this order from at least the outside,
The base material layer is made of a biaxially oriented polypropylene film,
The barrier layer is a film having a biaxially stretched film and a deposited layer of an inorganic metal or inorganic oxide deposited on the surface of the biaxially stretched film ,
The sealant layer consists of low density polyethylene,
A packaging bag comprising a substrate layer and a vapor-deposited surface of a barrier layer laminated via a melt-extruded sandwich resin layer of an ethylene copolymer resin. The ethylene copolymer resin layer is composed of an ethylene-vinyl acetate copolymer, an ethylene-carboxylic acid ester copolymer, an ethylene-carboxylic acid copolymer, or a copolymer or mixture thereof. The packaging bag according to claim 1, characterized by: 3. The packaging bag according to claim 1, wherein the barrier layer and the sealant layer are laminated via a melt-extruded polyolefin resin layer as a sandwich resin layer. 4. The packaging bag according to any one of claims 1 to 3, wherein the base material layer along the inside of one side of the packaging bag to be opened has a linear easy-to-open processing line. 5. The packaging bag according to claim 4, wherein the easy-open processing lines are composed of pores linearly arranged through only the base material layer . 5. The packaging bag according to claim 4, wherein the easy-to-open processing line consists of a non-stretched portion which is linearly remelted.

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