JP2011006084A - Packaging film, packaging bag, and package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging film, a packaging bag, and a package capable of discharging excessive steam outside even after the sealing, having high oxygen barrier property, capable of keeping contents for a long time, and omitting a content cooling process during the packaging work.SOLUTION: The packaging film comprises a base material, an anchor coat layer and a thermoplastic resin layer. The base material has the oxygen barrier property and the moisture permeability. The thermoplastic resin layer has the heat sealability from the anchor coat layer. The thermoplastic resin layer having a thickness of 5-100 μm is formed in a stripe shape having the width of 0.25-5 mm and the pitch of 0.5-10 mm. Further, the moisture permeability in accordance with JIS K-0208 is ≥100 g/(mday), and the oxygen permeability in accordance with JIS K-7126 is ≤200 cm/(mMPa day).

Description

  The present invention relates to a packaging film, and more particularly to a packaging film, a packaging bag, and a packaging body that have oxygen barrier properties but also moisture permeability and do not cause condensation inside the packaging body. .

  In the present specification, “ratio”, “part”, “%” and the like indicating the composition are based on mass unless otherwise specified, and the “/” mark indicates that they are integrally laminated. "PA" is "polyamide", "LDPE" is "low density polyethylene", "LLDPE" is "linear low density polyethylene", "PP" is an abbreviation, functional expression, common name, or An industry term.

(Background Art) Conventionally, for example, various contents such as foods and drinks, pharmaceuticals, cosmetics, detergents, chemicals, miscellaneous goods, etc. are stored, transported, sold, delivered to consumers and consumed. Is packaged so that it is maintained. Various packaging materials have been developed and proposed by using plastic substrates, paper substrates, metal foils, or the like and arbitrarily laminating them to fill and package the contents. These packaging materials are usually provided with a heat sealable (also referred to as HS) sealant layer (also referred to as an HS layer) in the innermost layer, the sealant layers are opposed to each other, and the peripheral edge is heated. Various forms of packaging bags are manufactured with sealing. However, packaging contents such as foods and drinks with high water activity, pharmaceuticals, etc., causes condensation on the inner surface of the bag due to the water vapor evaporated from the contents themselves, and microorganisms such as fungi, yeasts, bacteria, etc. propagate was there.
Therefore, the packaging film for contents such as foods and drinks with high water activity and pharmaceuticals can be sealed, can release extra water vapor to the outside and protect it from the growth of microorganisms, and has a high oxygen barrier property. Prevents oxidative degradation of the product, enables long-term storage, and also eliminates the cooling process of the contents during packaging operations, and improves the appearance, hygiene, quality retention, productivity, and cost of the contents. There is a demand for excellence.

JP-A-8-205854 JP 2006-282240 A Japanese Utility Model Publication No. 51-15682 JP 2006-282240 A

(Prior Art) Conventionally, in the field of packaging culture media for microorganisms, plants, etc., a petri dish in which a sterile agar medium is dispensed in a sterile state is usually stored in a plastic bag and sealed, and is called a raw medium. Are commercially available. The plastic bag used for packaging of the above-described commercially available raw medium usually uses a biaxially stretched polypropylene film as a base film, and an unstretched polypropylene film or a linear polyethylene film as a sealant layer. It is comprised from the laminated | multilayer film which bonded together. For example, as a conventional culture medium packaging bag, a plastic bag using a laminated film of stretched polypropylene and polyethylene is known (for example, see Patent Document 1). However, in a plastic bag, for example, when agar medium or fruits and vegetables are stored and sealed, water vapor generated from the contents themselves or water droplets generated when the agar medium solidifies may be released sufficiently to the outside. However, there is a problem in that condensation occurs on the inner surface of the bag or the surface of the petri dish and it rots.
For this reason, when using an agar medium with condensation on the surface of the petri dish, remove the petri dish containing the agar medium from the plastic bag and open the petri dish in the clean bench. Generally, the petri dish into which the medium is dispensed is left to dry. However, in the former packaging form, foreign substances such as microorganisms and dust floating in the air may be mixed in the petri dish into which the agar medium is dispensed during drying in a clean bench, causing contamination and If there are many specimens that detect the presence or absence of bacteria such as E. coli, the handling of the petri dish will be troublesome, work efficiency will be reduced, and the petri dish with the agar medium dispensed in a state where condensation has occurred for a long time is stored. If this is done, there is a problem that the possibility of corruption increases.
In addition, a method for preventing mold growth and oxidative deterioration of contents by wrapping the contents and oxygen scavenger with a film having oxygen barrier properties and removing oxygen in the bag has been widely used for a long time. In particular, it has achieved great results as a means for distributing foods that have a high water activity, such as half-baked confectionery, that molds can easily propagate in the distribution process for a long period at room temperature. However, if confectionery or bread is packaged with a general film immediately after baking, dew condensation occurs in the bag, and not only does the condensed water adhere to the surface of the contents, reducing the texture, but also an oxygen scavenger. In order to prevent the contamination of bacteria and foreign substances during cooling, it is necessary to insert a cooling process after baking and before packaging. There is a drawback that the cooling equipment such as the generator and the space, energy, labor costs, etc. necessary for the operation of the equipment are a heavy burden on the company.
Also, in the field of packaging fruits and vegetables, if, for example, fruits and vegetables are individually wrapped and sealed in a packaging bag made of film, the water vapor evaporated from itself cannot be released sufficiently to the outside. When it is stored for a long time as it is, there is a problem that the part is damaged. From this fact, a moisture-permeable packaging film, a moisture-permeable packaging bag, and a moisture-permeable packaging body that can discharge condensed water in the bag to the outside of the bag while the bag is sealed are known ( For example, see Patent Document 2.) However, in the moisture-permeable packaging body, the effect of releasing the condensed water in the bag is sufficiently obtained even in the case of the raw medium packaging body having a large amount of condensed water, but the portion where the anchor coating agent is exposed. The heat sealability of this depends on the heat sealability of the anchor coating agent, so the hot sealability is extremely low, and after the contents are stored in the bag, the opening is sealed by heat sealing. Immediately after heat sealing, seal omission is likely to occur at the heat seal portion between the exposed portions of the anchor coating agent, and it is difficult to guarantee the sealing performance even though there is no gap for entry of insects and foreign matters.
Furthermore, most oxygen barrier films have high water vapor barrier properties and cannot be used as moisture-releasing films. However, MXD polyamide films, MXD polyamide co-extruded polyamide films, ethylene vinyl, which are generally called barrier polyamide films, are used. Alcohol copolymer coextruded polyamide films and coating type barrier polyamide films having a coating film with low water vapor barrier properties have the property of having low oxygen barrier properties and low water vapor barrier properties. It is possible to produce a film that can be formed into a bag body because it is made of a selectively permeable membrane and has a heat-sealing property, that is, it is difficult to pass oxygen if it is extruded and coated with a linear thermoplastic resin, but water vapor passes. It becomes possible. However, as described above, since a film obtained by extruding a thermoplastic resin in a linear form cannot guarantee sealing performance, it cannot be used for a bag body that contains a deoxidizing agent that requires sealing performance.
Further, a breathable bag having a structure in which a filter tape (sterilized paper) is thermally bonded to the inner surface of the joint portion at both ends of the packaging material having a heat adhesive film on the inner surface is known (for example, a patent) Reference 3). However, since the sterilized paper has air permeability, there is a drawback that the bag body has no oxygen barrier property and cannot be used for the bag body containing the oxygen scavenger.
Furthermore, the present applicant also has a film in which a large number of thermoplastic resins are linearly formed in parallel on one side of a moisture-permeable base film, and water vapor at 40 ° C. and 90% RH of the film. An application has been filed for a moisture-permeable packaging film (see Patent Document 4) having a permeation amount of 100 g / m ² · 24 hr or more. However, there is no description or suggestion about the oxygen barrier property, the heat seal property of the seal portion, the configuration of the opening or the heat seal property. In order to solve these problems, the present invention has been accomplished.

  In order to solve the above-described problems, the present inventors have made extensive studies and have completed the present invention. Its purpose is a film for packaging foods, foods, and other contents with high water activity, which can guarantee sealing, release excess water vapor to the outside, and protect it from the growth of microorganisms. The content is high, prevents oxidative deterioration of the contents, enables long-term storage, and further, the contents cooling process can be omitted during packaging work, and the appearance, hygiene, quality retention, and productivity of the contents The present invention provides a packaging film, a packaging bag, and a packaging body that are excellent in cost.

In order to solve the above problems, a packaging film according to the invention of claim 1 of the present invention is a packaging film comprising a substrate, an anchor coat layer, and a thermoplastic resin layer, wherein the substrate is oxygen barrier property. The thermoplastic resin layer has heat sealability with the anchor coat layer, and the thermoplastic resin layer having a thickness of 5 μm to 100 μm has a width of 0.25 to 5 mm and a pitch of 0.1 mm. It is formed in a stripe shape of 5 mm to 10 mm, has a moisture permeability of 100 g / m ² · day or more according to JIS K-0208, and has an oxygen permeability of 200 cm ³ / m according to JIS K-7126. ² · MPa · day or less.
The packaging bag according to the invention of claim 2 has one side which is formed by using a three-side sealed bag making machine with the thermoplastic resin layer surface of the packaging film of claim 1 inside. A three-side sealed bag-shaped packaging bag, the opening being parallel to the stripe of the thermoplastic resin layer.
The package according to the invention of claim 3 is a package formed by storing the contents and the oxygen scavenger from the opening of the packaging bag according to claim 2, and heat-sealing the opening. The heat seal width of the opening is set to be equal to or larger than the stripe pitch of the thermoplastic resin layer.
The package according to the invention of claim 4 is such that the content of the package of claim 3 is an anaerobic bacterial raw medium.
A method for producing a food or medicine having a temperature of 100 ° C. or less according to the invention of claim 5 is a method for producing a food or medicine having a package content of claim 3 of 100 ° C. or less, wherein the content is produced. , Without being subjected to a cooling step, it is stored immediately and the opening is heat sealed.

According to the first aspect of the present invention, even if the contents of foods and drinks having high water activity, pharmaceuticals, etc. are sealed with the packaging film according to the present invention, excess water vapor can be released to the outside and microorganisms can propagate. It protects and has high oxygen barrier properties, and prevents the contents from being oxidized and can be stored for a long time.
According to the second aspect of the present invention, in addition to the effect of the first aspect, there is an effect that the sealing performance is more excellent.
According to the third aspect of the present invention, in addition to the effects of the first and second aspects, even in the heat seal of the opening after storing the contents, the effect of better sealing performance is exhibited.
According to the fourth aspect of the present invention, there is an effect that even a raw medium for anaerobic bacteria can be stored for a long period while being protected from the growth of microorganisms.
According to the present invention of claim 5, since the contents can be packaged immediately after production, the cooling process of the contents can be omitted, and the appearance, hygiene, quality retention, productivity, and cost of the contents can be reduced. Has an excellent effect.

It is sectional drawing of the film for packaging which shows one Example of this invention. It is explanatory drawing which shows a part of manufacturing process of the film for packaging of this invention. It is a top view of the packaging bag of this invention. It is a top view of the package of the present invention. It is an expanded sectional view of XX of FIG. FIG. 5 is an enlarged cross-sectional view taken along line YY in FIG. 4.

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

(Packaging Film) As shown in FIG. 1, the packaging film 1 of the present invention is a packaging film comprising a base material 2, an anchor coat layer 11, and a thermoplastic resin layer 3, and the base material 2 has an oxygen barrier property. Moreover, it has moisture permeability, and the thermoplastic resin layer 3 has heat sealability with the anchor coat layer 11. Further, the thermoplastic resin layer 3 having a thickness of 5 μm to 100 μm is formed in a stripe shape having a width of 0.25 to 5 mm and a pitch of 0.5 mm to 10 mm. That is, a large number of thermoplastic resins are linearly arranged in parallel. A layer formed into a stripe shape (hereinafter referred to as a striped thermoplastic resin layer, and further referred to as a stripe PE when the thermoplastic resin layer is PE). In addition, the moisture permeability according to JIS K-0208 is 100 g / m ² · day or more, and the oxygen permeability according to JIS K-7126 is 200 cm ³ / m ² · MPa · day or less.

(Substrate) The substrate 2 is required to transmit water vapor, and the moisture permeability according to JIS K-0208 is required to be 100 g / m ² · MPa · day or more. If the water vapor transmission rate is less than 100 g / m ² · day, the amount of excess water vapor evaporated from the content itself is insufficient, which is not preferable. Specifically, the substrate 2 includes MXD polyamide film, MXD polyamide coextruded polyamide film, ethylene vinyl alcohol copolymer coextruded polyamide film, and a coating type barrier polyamide film having a coating film having low water vapor barrier properties. It can be used suitably. The product names of the coating type barrier polyamide films having a coating film having a low water vapor barrier property are specifically listed as “Co barrier” (manufactured by Kojin Co., Ltd.), “Besera”. ”(Made by Kureha Co., Ltd.),“ Clarista ”(made by Kuraray Co., Ltd.),“ HON ”(made by Daicel Value Coating Co., Ltd.), etc. For other films, it is necessary to ask the film manufacturer for moisture permeability in advance. There is.

  Moreover, even if it is a coating type barrier property polyamide film, a polyvinylidene chloride coating polyamide film, a metal oxide vapor deposition polyamide film, a metal vapor deposition polyamide film, etc. with high water vapor | steam barrier property cannot be used for this invention. Although the thickness of the base material 2 is only 15 μm to 25 μm, it is not necessary to specifically limit the thickness. Further, if a coating type barrier polyamide film having a coating film having a low water vapor barrier property is developed, they may be used.

(Multiple base materials) Although not particularly shown, a plurality of the above base materials may be bonded together as long as the moisture permeability is 100 g / m ² · MPa · day or more. The substrate 2 can also be formed by bonding a moisture-permeable film to a moisture-permeable substrate film having oxygen barrier properties. As the bonding method, dry lamination using an adhesive, wet lamination, or the like can be suitably used. Extrusion lamination using a molten resin cannot be used because the extruded resin film reduces moisture permeability. However, this is not the case when the molten resin is extruded and bonded in a straight line.

  (Moisture permeable film) Examples of the moisture permeable film include air permeable films such as paper, spunbond and perforated films, for example, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyacrylate, N-methoxy-6. -Nylon, Poori vinyl ether, polyvinyl pyrrolidone, polyethylene oxide, cellulose triacetate, cellulose diacetate, cellulose acetate butyrate, carboxymethylcellulose, methylcellulose, cellophane, etc. A sheet provided with a low coating film can be used. In addition, when multilayering a moisture-permeable base film having oxygen barrier properties, the surface on which the linear thermoplastic resin is to be provided should be determined in consideration of the adhesiveness of the anchor coat agent, compatibility with the contents, etc. It is. For example, if a linear thermoplastic resin is provided on the surface of the breathable film, the adhesive components and residual solvent reach the contents through the breathable film, which is not preferable for food packaging. If a linear thermoplastic resin is provided on the surface, the anchor coat agent is easily peeled off by moisture generated from the contents, which is not preferable.

  (Printing) The packaging film 1 of the present invention can also be printed. When the base material 2 is a single layer, it can be printed on the surface opposite to the thermoplastic resin surface so that the odor of the ink does not transfer to the contents. Moreover, when the base material 2 is a multilayer, if the film on the front side is transparent, it can be printed on the bonded surface to make a back print, and ink can be prevented from falling off. If the front film is opaque, it may be printed on the front. In any case, a label sticker on which a product name and other display items are printed may be attached without printing.

  (Thermoplastic resin layer) By forming the thermoplastic resin layer 3 in a striped pattern intermittently on one side of the substrate, the packaging bag 10 having excellent oxygen barrier properties, moisture permeability and heat sealability can be produced. it can. The thermoplastic resin layer 3 may be any resin that has a heat sealing property that can be melted by heating and can be fused to each other, and that is formed by melt extrusion using an extruder or the like. Resin, high density polyethylene resin, linear low density polyethylene resin, copolymer resin with ethylene / α-olefin polymerized using metallocene catalyst, ethylene / polypropylene copolymer resin, ethylene / vinyl acetate copolymer resin , Ethylene / acrylic acid copolymer resin, ethylene / ethyl acrylate copolymer resin, ethylene / methacrylic acid copolymer resin, ethylene / methyl methacrylate copolymer resin, ethylene / maleic acid copolymer resin, ionomer resin Unsaturated carboxylic acid, unsaturated carboxylic acid, unsaturated carboxylic acid Things, graft polymerization of ester monomers, or a copolymer resin may be used in combination one or more resins of maleic anhydride was graft-modified polyolefin resin.

  (Exposed Area) In the packaging film 1, the anchor coat layer 11 is exposed in a portion of the stripe-shaped thermoplastic resin layer 3 without the stripe, and the exposed area is within a range of 10% to 80% of the whole. It is preferable that the amount of permeation required for the water vapor evaporated from the contents in the bag to permeate is obtained and the sealing strength required for the packaging bag 10 is obtained. If the exposed area of the base material 2 film is less than 10%, it is not preferable because the permeation amount necessary for moisture vapor to evaporate from the contents in the bag cannot be obtained, and the exposed area of the base film. If it is less than 80%, the sealing strength required for the packaging bag 10 cannot be obtained, which is not preferable. Here, when the exposed area of the substrate 2 is 80%, the thickness of the thermoplastic resin layer 3 is increased to increase the heat seal pressure, the heat seal temperature, or the time to Since the thermoplastic resin layer 3 sandwiched between the bars is crushed and spread, and is heat-sealed with an anchor coating agent having heat sealability, it is possible to obtain usable seal strength. Next, in the packaging film 1, the moisture permeability of the film itself of the base material 2, the moisture permeability of the thermoplastic resin layer 3 itself, and the exposed area of the film of the base material 2 so as to have a predetermined water vapor transmission amount From the above, it is possible to arbitrarily select the thickness, width and interval of the linear thermoplastic resin layer 3 as required.

(Stripe width, pitch) Specifically, for example, in order to set the moisture permeability to 100 g / m 2 · 24 hr or more, for example, the thermoplastic resin layer 3 having a water vapor permeability of 20 g / (m 2 · 24 h) at a thickness of 25 μm When the base material 2 (thickness 15 μm) having a water vapor permeability of 300 g / m ² · day is used, a linear thermoplastic resin having a thickness of 5 μm to 100 μm, a width of 0.5 mm to 3 mm, It is preferable that a large number are formed at intervals of 5 mm to 10 mm.

  (Heat seal strength) Further, the heat seal strength of the moisture permeable packaging film 1 having oxygen barrier properties according to the present invention is required to be in the range of 3 N / 15 mm to 100 N / 15 mm for use as a packaging bag. The seal strength is preferably about 6 N / 15 mm to about 60 N / 15 mm.

(Area ratio) The packaging film 1 has an oxygen barrier property by adjusting the ratio of the total area of the thermoplastic resin layers 3 formed linearly in parallel to the total area of the substrate 2. It is possible to control the amount of water vapor permeated through the moisture permeable packaging bag. The moisture permeability of the packaging film 1 may be appropriately selected from a predetermined range depending on the application. Specifically, for example, the water vapor permeability (synonymous with water vapor transmission rate) of the film of the base material 2 having the oxygen barrier property, 300 g / (m 2 · 24 h) on one side as the extruded thermoplastic resin, the thickness is 25 μm. Using a polyethylene resin having a water vapor transmission rate of 20 g / (m2 · 24h) in a polyethylene resin of 1 mm, a thickness, 50 μm, a linear extrusion width of 2 mm are formed, and (1) the spacing of the linear extrusion polyethylene is 1 mm Water vapor transmission rate is 110 g / m ² · day, and (2) When the linear extruded polyethylene spacing is 2 mm, the water vapor transmission rate is 160 g / m ² · day, and (3) Linear extruded polyethylene spacing. Is 4 mm, the water vapor permeability is 200 g / m ² · day. By this, it is possible to discharge excess water vapor to the outside without condensation on the inner surface of the film due to water vapor evaporated from the content itself, and it is possible to prevent the content from being dried too much There is.

(Oxygen barrier property) The oxygen permeability of the film of the base material 2 is 200 cm ³ / m ² · MPa, although it depends on the size of the bag, the storage period of the contents, the oxygen absorption capacity of the oxygen scavenger, etc. · Day or less, preferably 50 cm ³ / m ² · MPa · day or less. Further, since the oxygen barrier property of the thermoplastic resin layer 3 is relatively low, there is almost no influence on the packaging film 1 and it depends on the substrate 2.

  (Anchor coat layer) In the packaging film 1 according to the present invention, an anchor coat layer 11 having heat sealability is provided on the surface of the base material 2 on which the thermoplastic resin layer 3 is formed in order to improve the adhesion between them. Need to form. As a result, the non-formed portion of the thermoplastic resin layer 3 is not blocked after winding even at the portion where the surface of the anchor coating agent forming portion is exposed, and has a heat seal property. The non-formation part of the thermoplastic resin layer 3 of the heat seal part can be sealed. The anchor coating agent 11 having heat sealability is not particularly limited as long as there is no problem in terms of hygiene. Specifically, for example, an organic titanium anchor coating agent, a polyethyleneimine anchor coating agent, and a polybutadiene anchor coating agent are used. Etc. can be used.

Preferably, an aqueous dispersion in which a polyethyleneimine anchor coating agent and a polyolefin copolymer resin containing 0.01 to 5% by mass of an unsaturated carboxylic acid or anhydride thereof are dispersed so that the number average particle diameter thereof is 1 μm or less. It is preferable to use an anchor coating agent which is a liquid and is composed of an aqueous dispersion formed so that the aqueous dispersion does not substantially contain a nonvolatile aqueous auxiliary agent. Since the polyamide film has water absorbency, and the anchor coating agent is used, the anchor coating agent peels off when the polyamide film absorbs water, and the heat seal layer peels off. In the present invention, a two-component curable isocyanate anchor coating agent having no heat sealability is used. However, in the present invention, the film has a high moisture permeability and the film is hardly wetted with water. But it can be used without problems. And in this invention, it can coat by normal coating methods, such as a gravure coat and a roll coat, using the above anchor coating agents, and can form a primer layer. Further, the coating amount is preferably about 0.1 to 5 g / m ² . Further, on the surface side of the base material 2 on which the thermoplastic resin layer 3 is formed, an easy adhesion treatment such as a corona discharge treatment or an ozone treatment is performed in advance in order to increase the adhesive strength with the thermoplastic resin layer 3. You may give it.

  (Stripe Formation) Next, a method for forming a stripe of the thermoplastic resin layer 3 will be described. FIG. 2 is a schematic view showing a part of the manufacturing process of the packaging film 1 according to the present invention. As shown in FIG. 2, a large number of straight lines are formed in parallel on one side of the base material 2 by melt extrusion of the thermoplastic synthetic resin 3 to form stripes. The packaging film 1 is formed by a substrate 2 being brought into contact with a cooling roll and melt-extruded from a number of nozzles attached to the tip of a T die as an extruder installed above the cooling roll. A large number of nozzles are provided in a row in a direction crossing the supply direction of winding of the substrate 2 film. Further, the anchor coating agent applied to the base material 2 is exposed at a portion where the thermoplastic synthetic resin 3 extending in parallel for a long time is not present. Then, it is wound up with a winder and the packaging film 1 can be manufactured.

  (Packaging Bag) FIG. 3 is an external plan view of the packaging bag 10 according to the present invention. As shown in FIG. 3, the packaging bag 10 uses a packaging film 1 and is a bag body that is closed on three sides with an opening 6 so that the formation surface of the thermoplastic resin layer 3 is on the inside. The three-side seal bag formed by a three-side seal bag making machine in which the vertical seal portion 4 and the horizontal seal portion 5 are both subjected to heat sealing and cooling under the same tension, and the opening 6, the linear thermoplastic resin layer 3 is formed in parallel with the opening side.

  Since the thermoplastic resin layer 3 has a stripe shape formed in a large number of straight lines in parallel, the surface of the base material 2 is configured to be exposed at regular intervals, so that the contents of the packaging bag 10 are transpiration. Excess water vapor can be released to the outside without causing condensation on the inner surface of the packaging film 1 due to the water vapor, and the contents can be prevented from drying out too much. Also, since at least the lateral seal portion 5 is formed by a three-side sealed bag making machine in which heat sealing and cooling are continuously performed under the same tension, a large number of linearly formed thermoplastic resins The portion where the anchor coating agent is exposed between the layers 3 is also fixed by being cooled with almost no contraction of the film immediately after the heat seal bar is released from the film immediately after heat sealing. Is possible.

  If an attempt is made to form the heat seal portion in the direction orthogonal to the linear thermoplastic resin layer 3 with a packaging machine, the packaging machine cannot always apply a constant tension to the heat seal portion. Since the film shrinks when the film is still hot at the moment of leaving the film, the heat seal part of the anchor coating agent with low heat sealability and heat sealability is peeled off and sealed. Can not. That is, the horizontal seal 5 is performed by a bag making machine that performs heat sealing and cooling continuously, and the vertical seal 4 is an opening 6 that seals (heat seals) after storing the contents. Both the part 5 and the vertical seal part 4 can be easily heat-sealed, and the sealing performance is good.

  Also, as shown in FIG. 3, the packaging bag 10 of the present invention has the linear thermoplastic resin layer 3 formed in the opening 6 in parallel with the opening side. The thermoplastic resin layer 3 melts and flows in a narrow space where the film is sandwiched between high-temperature heat seal bars, and spreads to form a heat seal portion between the thermoplastic resin layers 3, thus ensuring sealing performance. It becomes possible to do. At this time, as shown in FIG. 6, the air biting portion 8 is linearly formed in the heat seal portion in parallel with the thermoplastic resin layer 3, but the air biting portion is sandwiched between the thermoplastic resin layers 3. Therefore, even when it becomes a package, it is excellent in hermeticity without causing seal omission.

  (Opening) The above illustration is an example of the bag according to the present invention, and the present invention is not limited thereby, and the opening 6 of the bag is parallel to the opening side. It is sufficient that the linear thermoplastic resin layer 3 is formed. It is only necessary that the opening side and the length direction of the stripe are parallel to each other. In addition to the three-sided seal bag, two-sided seal bags and stand packs can be used as normal bag-making methods. If the bag is a pillow bag, the back seal is applied after the top and bottom seals are applied. Cut the side edge of the bag body in parallel. In the case of a single gusset bag, the side edge opposite to the gusset side is trimmed. In short, if the heat sealing of the lateral seal portion 5 is performed by a bag making machine, it does not depend on the shape of the bag body.

  (Packaging body) FIG. 4 is an external plan view of a state (packaging body 20) in which the contents are stored in the packaging bag 10 according to the present invention. As shown in FIG. 4, the package 20 according to the present invention stores fresh food products such as green vegetables and persimmons, hydrated food products such as processed foods, microorganisms, culture media such as plants, and pharmaceuticals as contents. Therefore, it is possible to discharge excess water vapor to the outside without condensation on the inner surface of the packaging film 1 due to water vapor evaporated from the content itself, and it is possible to prevent the content from being dried too much. Yes, because the contents have excellent hygiene, appearance, film strength, and sealing strength, they are excellent in distribution suitability, excellent in storage, thawing, freshness preservation, etc., and used for cooking in a microwave oven. It can be excellent. In addition, an anti-fogging film for preventing film fogging due to dew condensation on the inner surface of the bag body, which is used for packaging films for livestock meat products such as ham and sausage, fish paste products such as kamaboko and chikuwa, etc. is not required. It becomes possible to package hot products immediately after production with raw confectionery, steamed confectionery, bread, etc., and the cooling process is unnecessary, so not only the equipment, time and space required for the cooling process are unnecessary, The secondary contamination of the product in the cooling process can be prevented, and the growth of yeast on the product surface can be prevented.

  (Effect) According to the present invention, the following effects can be obtained. The packaging film 1 of the present invention has an oxygen barrier property and moisture permeability, can achieve both oxygen barrier property and moisture release performance, and can store the contents and form a package with good sealing properties. it can. Further, when manufacturing the packaging bag 10, the vertical seal portion 4 and the horizontal seal portion are formed by closing the bag body 3 with the opening 6 so that the formation surface of the thermoplastic resin layer 3 is inside. 5 is a three-side sealing bag (packaging bag 10) formed by a three-side sealing bag making machine in which heat sealing and cooling are performed under the same tension, and the opening 6 has an opening side. By forming the stripe-shaped thermoplastic resin layer 3 in parallel with the heat-sealing, it is not possible to guarantee hermeticity by heat sealing on the packaging machine, but heat in a direction perpendicular to the stripe-shaped thermoplastic resin layer 3 is ensured. It becomes possible to guarantee the sealing property of the seal portion.

  Further, the packaging body 20 of the present invention accommodates the contents and the oxygen scavenger from the opening 6 of the packaging bag 10 described above, and when the opening 6 is heat-sealed to provide a heat-sealing part and sealed, Since the width of the heat seal portion is at least the interval of the linear thermoplastic resin layer 3, sealing performance can be ensured. Since the oxygen-free state inside the body 20 can be maintained, it is possible to prevent the growth of fungi on the contents and the deterioration of the contents due to the dew condensation water while preventing the oxidative degradation.

  In addition, since the oxygen scavenger absorbs oxygen in the raw medium, it does not grow in the presence of oxygen, as in the case of anaerobic bacteria. Suitable for packaging.

  In addition, since hot fresh confectionery immediately after manufacture can be packaged immediately without dissipating heat, it becomes possible to omit the cooling process, and therefore, clean tunnels, cold air to prevent contamination by bacteria and foreign substances during cooling. It is possible to provide a cooling apparatus such as a generator and a manufacturing method that saves space, energy, labor costs, and the like necessary for the operation of the equipment.

  Thus, according to the present invention, it is possible to provide a package that is excellent in hygiene, productivity, and cost, and that is excellent in maintaining the freshness and preservability of contents such as foods, beverages, pharmaceuticals, and cosmetics. In addition, even when heated in a microwave oven with contents such as food and drinks and medicines stored, the seal seal is lost at the place where the anchor coat agent and thermoplastic resin are heat-sealed by heat sealing in the horizontal seal part. However, the bag does not rupture, and the water vapor is quickly discharged.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, it is not limited to this.

(Example 1) (1) A 15 μm thick ethylene vinyl alcohol copolymer coextruded polyamide film (trade name “Super Neal E”, manufactured by Mitsubishi Plastics Co., Ltd.) is used as a film of the substrate 2 on one side. After applying the polyethyleneimine anchor coating agent, a polyethylene resin (product name “LC604”, manufactured by Nippon Polyethylene Co., Ltd.) is used as the thermoplastic resin layer 3, and the thickness is linearly formed from a number of nozzles of the T die. The packaging film 1 of Example 1 was manufactured by forming a stripe shape with a pitch of 1.8 mm having a width of 60 μm and a width of 1 mm.
(2) The moisture permeable packaging film 1 having oxygen barrier properties obtained above is put on a bag making machine, and the transverse three-side sealed bag (packaging bag) according to the present invention having a length of 280 mm, a width of 360 mm, and a heat seal width of 10 mm. 10) was produced.
(3) On the other hand, what prepared and dispensed the normal agar medium (made by Eiken Chemical Co., Ltd.) to the petri dish made from polystyrene of diameter 90mm and height 14mm was used as the contents.
Thereafter, the above-mentioned ordinary agar medium as a content is dispensed, and 10 sheets of inverted petri dishes are stacked, and an oxygen scavenger (product name “AGELESS FX100” is opened from the opening of the packaging bag 10 obtained above. ”, Made with Mitsubishi Gas Chemical Co., Ltd., and after that, a 5 mm wide heat seal was applied to the bag opening using an impulse sealer (product name“ FA-450-5W ”, manufactured by Fuji Impulse Co., Ltd.). It sealed and produced the moisture-permeable packaging body (packaging body 20) which has oxygen barrier property based on this invention. In addition, although the presence or absence of the seal | sticker omission of a heat seal part was confirmed using the red penetrant (product name "Ageless seal check", Mitsubishi Gas Chemical Co., Ltd. product) on the said three-sided seal bag, the omission of a seal | sticker was not recognized.
(4) The package obtained above was stored for 2 weeks in a refrigerator having an internal temperature of about 3 ° C.
As a result, it was possible to discharge excess water vapor to the outside without condensation on the inner surface of the film due to water vapor evaporated from the content itself and without the content being too dry.
Furthermore, as a result of measuring the oxygen concentration in the bag with an oxygen concentration meter (manufactured by Toray Engineering Co., Ltd., model name: LC-750F), the oxygen concentration was 0.01% or less.
In addition, the moisture-permeable packaging body having oxygen barrier properties according to the present invention prevents foreign matter from entering from outside, is excellent in hygiene, appearance, film strength, seal strength, productivity, cost, and is a normal content The agar medium was excellent in maintaining the freshness and preservability.

(Comparative Example 1) (1) A 15 μm-thick ethylene vinyl alcohol copolymer coextruded polyamide film (product name “Super Neal E”, manufactured by Mitsubishi Plastics Co., Ltd.) was used as the base material 2, and polyethyleneimine on one side thereof After applying the base anchor coating agent, a 30 μm-thick linear low-density polyethylene film (product name “L4102”, manufactured by Toyobo Co., Ltd.) is used as the thermoplastic resin layer 3 with a 15 μm-thick molten polyethylene resin. Extrusion lamination was performed to obtain a packaging film of Comparative Example 1.
The packaging film having the oxygen barrier property obtained above was put on a bag making machine to produce the same three-sided sealed bag of Comparative Example 1 as in Example 1, having a length of 280 mm, a width of 360 mm, and a heat seal width of 10 mm.
(2) The same ordinary agar medium as in Example 1 was dispensed into the horizontal three-way sealed bag of Comparative Example 1 having the oxygen barrier property obtained above, and 10 pieces of the inverted petri dish and oxygen scavenger were bagged. After that, the bag opening was sealed with a 5 mm wide heat seal using an impulse sealer (product name “FA-450-5W”, manufactured by Fuji Impulse Co., Ltd.). A package having an oxygen barrier property was prepared. In addition, although the presence or absence of the seal | sticker omission of a heat seal part was confirmed using the red penetrant (product name "Ageless seal check", Mitsubishi Gas Chemical Co., Ltd. product) on the said three-sided seal bag, the omission of a seal | sticker was not recognized.
(3) The package obtained above was stored for 2 weeks in a refrigerator having an internal temperature of about 3 ° C.
As a result, the oxygen concentration in the bag was 0.01% or less as in Example 1, but a large amount of water condensed on the inner surface of the film due to water vapor evaporated from the contents itself was accumulated in the bag, and Since a film of water was formed on the surface of the culture medium, it could not be used as it was and could not be used unless the petri dish was taken out of the bag and dried overnight in a clean room.

(Example 2) (1) The freshly baked croissants and oxygen scavenger (product name “AGELESS FX200”) obtained in Example 1 and applied to the three-side sealed bag (packaging bag 10) according to the present invention. , Made by Mitsubishi Gas Chemical Co., Ltd., and sealed with a 5 mm wide heat seal on the bag opening using an impulse sealer (product name “FA-450-5W”, manufactured by Fuji Impulse Co., Ltd.). A moisture-permeable packaging body (packaging body 20) having an oxygen barrier property according to the present invention was produced.
The package obtained above was stored in a thermostatic bath at 30 ° C. for 5 days.
As a result, it is possible to release excess water vapor to the outside without causing condensation on the inner surface of the film due to water vapor evaporated from the content itself, and without excessively drying the content. The state was maintained.
From this result, it is clear that baked bread can be packaged, and what is sold on a tray in a normal baked bread store can be sold in a packed state, It has been found that the present invention can provide a sales method with excellent hygiene.

Comparative Example 2 (1) A bottom seal was applied to an inflation polypropylene tube having a thickness of 40 μm and a folding diameter of 280 mm, and then cut to a length of 360 mm to obtain a bag of Comparative Example 2. (2) The bag 6 croissants freshly baked on the body are stored and sealed using a 5 mm wide heat seal on the bag opening using an impulse sealer (product name “FA-450-5W”, manufactured by Fuji Impulse Co., Ltd.) A package of Comparative Example 2 was produced.
The package obtained as described above was stored in a thermostatic bath at 30 ° C. for only one day, but dew formation occurred in the bag, the croissant became funyahunya, and the texture was remarkably deteriorated.

(Example 3) (1) A coating type barrier polyamide film (trade name “Co-Barrier”, manufactured by Kojin Co., Ltd.) having a coating film having a thickness of 15 μm and a low water vapor barrier property is used as the base material 2, and its coating After a polyamide film (trade name “NAP22”, manufactured by Toyobo Co., Ltd.) was bonded to the surface using a two-component curable urethane resin adhesive, an unsaturated carboxylic acid was added to the polyamide film surface in an amount of 0.01 to 5 An aqueous dispersion in which a polyolefin copolymer resin containing mass% is dispersed so that its number average particle diameter is 1 μm or less, and the aqueous dispersion does not substantially contain a non-volatile aqueous additive. After forming an anchor coat layer 11 by applying an anchor coating agent made of an aqueous dispersion formed as described above, a polyethylene resin (trade) is used as the thermoplastic resin. Using a name “LC604” (manufactured by Nippon Polyethylene Co., Ltd.), a straight line having a thickness of 40 μm, a width of 1 mm, and parallelly formed at intervals of 1.1 mm from a number of nozzles of a T die. A moisture-permeable packaging film (packaging film 1) having oxygen barrier properties according to the present invention was produced.
(2) The moisture-permeable packaging film having oxygen barrier properties obtained above is placed on a bag making machine, and the transverse three-side sealed bag (packaging bag 10) according to the present invention having a length of 280 mm, a width of 360 mm, and a heat seal width of 10 mm. ) Was manufactured.
(3) Moreover, a commercially available wiener sausage (200 g) is used as the content, and an oxygen scavenger (product name “AGELESS” is obtained from the opening of the moisture-permeable packaging bag having oxygen barrier properties obtained above according to the present invention. FX100 "(Mitsubishi Gas Chemical Co., Ltd.) is stored together, and then a 5mm wide heat seal is applied to the bag opening using an impulse sealer (product name" FA-450-5W ", manufactured by Fuji Impulse Co., Ltd.). Then, a moisture-permeable packaging body (packaging body 20) having oxygen barrier properties according to the present invention was produced. In addition, although the presence or absence of the seal | sticker omission of a heat seal part was confirmed using the red penetrant (product name "Ageless seal check", Mitsubishi Gas Chemical Co., Ltd. product) on the said three-sided seal bag, the omission of a seal | sticker was not recognized.
The package obtained above was stored for 1 week in a thermostatic chamber having an internal temperature of about 30 ° C.
As a result, there was no dew condensation on the inner surface of the film due to water vapor evaporated from the contents themselves, and no off-flavor due to yeast growth occurred. However, although the surface of the contents was too dry, Wiener sausage was originally a smoked food, it was originally dried and there was no problem with the taste.
In addition, the moisture-permeable packaging body having oxygen barrier properties according to the present invention prevents foreign matter from entering from the outside, and is excellent in hygiene, appearance, film strength, seal strength, productivity, and cost, and is a content of livestock meat The product was excellent in maintaining freshness and storage.

(Comparative Example 2) (1) A two-component curable urethane resin anchor coating agent was applied to the vapor-deposited surface of a transparent vapor-deposited polyamide film (trade name “IB-ON-SC”, manufactured by Dai Nippon Printing Co., Ltd.) having a thickness of 15 μm. Then, a 35 μm thick antifogging linear low density polyethylene film (product name “L140NC”, manufactured by Aicero Chemical Co., Ltd.) is extruded and laminated on the surface using a molten polyethylene resin having a thickness of 15 μm. A packaging film having an oxygen barrier property of 3 was obtained.
(2) The packaging film having the oxygen barrier property obtained above was hung on a bag making machine, and the same three-sided sealed bag of Comparative Example 3 as in Example 1 having a length of 280 mm, a width of 360 mm, and a heat seal width of 10 mm. After the production, the same commercially available wiener sausage (200 g) as in Example 3 was used as the contents, and an oxygen scavenger (product name “AGELESS FX100”, Mitsubishi, from the opening of the bag of Comparative Example 3 obtained above. The product is stored together with Gas Chemical Co., Ltd., and then sealed using a impulse sealer (product name “FA-450-5W”, manufactured by Fuji Impulse Co., Ltd.) with a 5 mm wide heat seal on the bag opening. A package of Comparative Example 3 was produced. In addition, although the presence or absence of the seal | sticker omission of a heat seal part was confirmed using the red penetrant (product name "Ageless seal check", Mitsubishi Gas Chemical Co., Ltd. product) on the said three-sided seal bag, the omission of a seal | sticker was not recognized.
The package obtained above was stored for 1 week in a thermostatic chamber having an internal temperature of about 30 ° C.
As a result, no fogging was observed on the film because an anti-fogging film was used, but the condensed water accumulated in the bag, and the breeding of yeast produced alcohol and other odors, The situation was not suitable for eating.

  (Example 4) A packaging film 1 of Example 4 was obtained in the same manner as in Example 1 except that the stripe-shaped formation had a thickness of 30 µm, a width of 2 mm, and a pitch of 3.0 mm. In the same manner, the packaging bag 10 and the packaging body 20 were prepared.

  (Example 5) A packaging film 1 of Example 4 was obtained in the same manner as in Example 1 except that the stripe-shaped formation had a thickness of 80 µm, a width of 3 mm, and a pitch of 4.5 mm. In the same manner, the packaging bag 10 and the packaging body 20 were prepared.

(Measurement method) As a method for measuring moisture permeability (water vapor barrier property), it conforms to JIS K-0208 (g / m ² · MPa · day), and the oxygen barrier property is JIS K-7126 method B (cm ³ / m ² · MPa · day). Table 1 shows the layer structure, moisture permeability (water vapor barrier property), and oxygen barrier property of Examples and Comparative Examples.

  (Industrial Applicability) The main uses of the packaging film, packaging bag and package of the present invention are fresh food products such as green vegetables and persimmons, hydrated food products such as processed foods, microorganisms, plants, etc. By storing the culture medium, pharmaceuticals, etc. as the contents, excess water vapor can be released to the outside without condensation on the inner surface of the packaging film 1 due to the water vapor evaporated from the contents itself, and It is possible to prevent the contents from drying out too much, and because the contents are excellent in hygiene, appearance, film strength, and sealing strength, they are excellent in distribution suitability and suitable for storage, thawing, freshness preservation, etc. It is excellent and can be used for cooking by a microwave oven. In addition, an anti-fogging film for preventing film fogging due to dew condensation on the inner surface of the bag body, which is used for packaging films for livestock meat products such as ham and sausage, fish paste products such as kamaboko and chikuwa, etc. is not required. It becomes possible to package hot products immediately after production with raw confectionery, steamed confectionery, bread, etc., and the cooling process is unnecessary, so not only the equipment, time and space required for the cooling process are unnecessary, The secondary contamination of the product in the cooling process can be prevented, and the propagation of yeast on the product surface can be prevented. However, it is not particularly limited as long as it has an oxygen barrier property and also requires moisture permeability.

1: Packaging film 2: Base material 3: Thermoplastic resin layer 4: Vertical seal part 5: Horizontal seal part 6: Opening part 7: Heat seal part by packaging machine 8: Air biting part 9: Notch 10: Bag for packaging 11: Anchor coating agent 12 Coating roll 13: Drying zone 14: Cooling roll 15: Nip roll 16: T die 17: Winding 20: Package M: Contents

Claims (5)

In a packaging film comprising a base material, an anchor coat layer, and a thermoplastic resin layer, the base material has an oxygen barrier property and moisture permeability, and the thermoplastic resin layer has a heat seal property with the anchor coat layer. In addition, the thermoplastic resin layer having a thickness of 5 μm to 100 μm is formed in a stripe shape having a width of 0.25 to 5 mm and a pitch of 0.5 mm to 10 mm, and also moisture permeability according to JIS K-0208 There is a 100g / m ² · day or more, packaging films of the oxygen barrier property breathable, wherein the oxygen transmission rate conforming to JIS K-7126 is not more than ^{200cm 3 / m 2 · MPa ·} day.   A packaging bag in the form of a three-side sealed bag having an opening is formed by bag-making using a three-side sealed bag making machine with the thermoplastic resin layer side of the packaging film according to claim 1 on the inside. The packaging bag is characterized in that the opening is parallel to the stripe of the thermoplastic resin layer.   It is a package formed by storing the contents and oxygen scavenger from the opening of the packaging bag according to claim 2, and heat-sealing the opening, and the heat seal width of the opening is the thermoplastic. A package characterized by having a pitch equal to or greater than the stripe pitch of the resin layer.     The packaging body according to claim 3, wherein the content of the packaging body is a raw medium for anaerobic bacteria.     The content of the package according to claim 3 is a method for producing a food or pharmaceutical product of 100 ° C. or lower, wherein the content is produced, immediately stored without going through a cooling step, and the opening is heat sealed. A method for producing a food or pharmaceutical product having a temperature of 100 ° C. or lower.

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