JP5428190B2 - Packaging film and package - Google Patents

Description

  The present invention is a film laminated member for packaging, in which a film substrate made of a polyamide film is used as a base film, and has excellent gas barrier properties, pinhole resistance, puncture resistance, etc. Even so, there is little deterioration in gas barrier properties, excellent pinhole resistance and puncture resistance, and a packaging film that is suitably used for packaging of sugar beet, and a packaging container that is produced using this packaging film The present invention relates to a packaged body in which sugar beet is stored.

  Degradation of product quality due to changes in temperature in the distribution and sales process of packaging containing products such as food, or changes in moisture or oxygen in the packaging, is not only a loss in sales, but also in terms of food hygiene. It becomes a big problem. Therefore, the packaging body for storing foods and the like, and the packaging film used for the production of this packaging body are less susceptible to temperature changes, are less permeable to moisture, oxygen, etc., and are less likely to degrade the quality of the stored products. It is required to be. Recently, food distribution forms, packaging forms, and the like have changed drastically compared to conventional cases, and demands such as descriptions are increasing.

  For example, in food packaging, it is important to maintain the taste and freshness by suppressing the oxidation and alteration of proteins and fats in food components. Therefore, air and moisture are used by using packaging materials with good gas barrier properties. It is desirable to package in such a way as to block permeation and the like. If the food is packaged with a packaging member having a good gas barrier property, the aroma is maintained and the intrusion of moisture and the like is prevented, so that the moisture absorption deterioration is suppressed when the stored food is a dry food. In the case of a food containing moisture, the alteration and solidification due to the volatilization of moisture is suppressed, and it becomes possible to store the food while maintaining the fresh flavor and freshness during packaging for a long time.

  On the other hand, in response to the recent trend toward small families, foods such as side dishes are often packaged and sold in small quantities. Transparent packaging of sugar beet is possible, and the product (food) looks good, and transparent sachets that are easy to incinerate after use are suitable. Yes.

  The packaging member that constitutes the bag for storing the prepared food must have gas barrier properties so that the prepared prepared food is not oxidized during storage and the color changes or the taste does not change. Since the boil sterilization treatment is often performed, it is also desired that the boil sterilization resistance is provided.

  Also, side dishes that contain a lot of solids and heavy foods such as boiled and chikuzenni have pinhole resistance and puncture resistance because they may cause pinholes by damaging the packaging material. It is also necessary, and many packaging members using a polyamide film as a base film are used. For example, a polyester film is used as a gas barrier film, and a three-layer structure of a nylon film and a sealant film excellent in puncture resistance, or a two-layer structure of a sealant film using a gas barrier nylon film. .

On the other hand, as a material using a gas barrier nylon film that can be boil sterilized, there is a packaging member in which a vapor deposited thin film of aluminum is provided on a gas barrier nylon film. Cannot be done, and the product looks bad. Moreover, what used the film which consists of polyvinylidene chloride has inadequate barrier property, and the period which can preserve | save the packaged goods without causing quality deterioration will become short. Furthermore, those using a film made of an ethylene / vinyl alcohol copolymer have a problem in that the oxygen gas barrier property is remarkably lowered at high humidity, and the storage period is shortened.

  On the other hand, a vapor deposition film provided with a vapor deposition thin film made of silicon oxide, aluminum, or the like as a gas barrier layer has been proposed so that the gas barrier property is high and the gas barrier property does not change depending on the storage environment (see, for example, Patent Document 1).

  However, if a packaging bag made using such a gas barrier vapor-deposited film is filled and packaged with side dishes containing a large amount of solids, the vapor-deposited thin film is fragile, so the vapor-deposited thin film is difficult to handle. The layer may be damaged or destroyed, and the gas barrier property may be greatly reduced.

  In order to overcome the brittleness of the deposited film, it has also been proposed to provide a protective layer on the deposited thin film (see, for example, Patent Document 2).

However, this gas barrier film has low resistance to the boil treatment, and the barrier property and adhesion may be lowered after the boil treatment. In addition to this, there are also proposals that use nylon-based barrier films that do not easily degrade barrier properties and adhesion even if they are boiled. Is not a positive improvement.
Japanese Patent Laid-Open No. 6-238836 Japanese Patent Laid-Open No. 11-262986

  The present invention has been made in view of the situation as described above, and uses a film base made of a polyamide film as a base film, and has excellent gas barrier properties, pinhole resistance, puncture resistance, and the like. This is a laminated member, in particular, a film for packaging that is less deteriorated in gas barrier properties even when subjected to boil sterilization treatment, is excellent in pinhole resistance and puncture resistance, and is suitably used for storing sugar beet, and this packaging A package is provided in which a prepared dish is stored in a packaging container made using the film for packaging.

In order to achieve the above-described problems, the invention according to claim 1 includes an anchor coat layer containing at least an acrylic polyol and triidyl isocyanate on at least one surface of a film substrate made of a polyamide film, and an inorganic compound. Vapor-deposited thin film layer, Si (OR ¹ ) ₄ and R ² Si (OR ³ ) ₃ (R ¹ and R ³ are hydrolyzable groups such as CH ₃ , C ₂ H ₅ and C ₂ H ₄ OCH ₃ , R ² Is a gas-barrier coating layer or seal layer which is a heat-dried coating of a thin film comprising a silicon compound represented by an organic functional group) or a hydrolyzate thereof and a gas-barrier coating solution mainly composed of a water-soluble polymer having a hydroxyl group. Is a laminated member formed by laminating at least in this relative order, and the maximum shrinkage after boil treatment at 90 ° C. for 30 minutes is 3% or less, and the piercing strength And a 8N above, the sealing layer is made of a polyolefin resin, a packaging film sealing temperature is characterized in that it is a 110 ° C. to 145 ° C..

The invention according to claim 2 is the packaging film according to claim 1, wherein the seal layer is made of unstretched polypropylene resin , and the seal temperature is 145 ° C.

   Furthermore, the invention according to claim 3 is a package comprising the packaging film according to claim 1 or 2 and containing sugar beet.

According to the present invention, at least one surface of a film substrate made of a polyamide film has an anchor coat layer, a vapor-deposited thin film layer made of an inorganic compound, Si (OR ¹ ) ₄ and R ² Si (OR ³ ) ₃ (R ¹ , R ³ is a hydrolyzable group such as CH ₃ , C ₂ H ₅ , C ₂ H ₄ OCH ₃ , R ² is an organic functional group) or a hydrolyzate thereof, and a water-soluble polymer having a hydroxyl group Since the gas barrier coating layer, which is a heat-dried thin film consisting of a gas barrier coating solution containing as a main component, is laminated at least in this relative order, it has excellent gas barrier properties and adhesion, and is boiled at 90 ° C. for 30 minutes. Since the maximum shrinkage after the treatment is 3% or less, even if the boil sterilization treatment is performed, the barrier property is hardly deteriorated, and the puncture strength is 8N or more. Less likely to occur, is excellent in the filling suitability of prepared foods are solid. In addition, when the sealing layer made of polyolefin resin having a sealing temperature of 90 ° C. or higher is laminated on the gas barrier coating layer surface, there is no fusion of the sealant due to heat when filling with sugar beet and boil sterilization treatment, The take-out property is not impaired.

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

  FIG. 1 shows a schematic cross-sectional structure of the packaging film of the present invention. In general, the packaging film has an easy-adhesion layer 7, an anchor coat layer 2, an evaporated thin film layer 3 made of an inorganic compound, and a gas barrier coating layer 4 on one surface of a film substrate 1 made of a polyamide film. The adhesive layer 5 and the seal layer 6 are laminated in this relative order.

  The film substrate 1 is made of a polyamide film which is excellent in flexibility and excellent in puncture resistance and impact resistance among films made of a plastic material. Among them, a stretched transparent nylon resin film is preferable. Used. Specifically, nylon 6 obtained by ring-opening polymerization reaction of ε-caprolactam, nylon 66 obtained by polycondensation reaction of hexamethylenediamine and adipate, and obtained by polycondensation of metaxylenediamine and adipic acid. A general-purpose film made of MXD6 nylon, nylon 11, nylon 12, or the like can be used. The stretching method may be a biaxial stretching method or a sequential stretching method. Further, the thickness is preferably in the range of about 12 to 25 μm from the viewpoints of film formability and economy. In addition, the film substrate may contain various additives and stabilizers, such as antistatic agents, ultraviolet inhibitors, plasticizers, lubricants, etc., and the surface thereof is treated with corona treatment as a pretreatment, Low-temperature plasma treatment, ion bombardment treatment, or the like may be performed, and further chemical treatment, solvent treatment, or the like may be performed.

  In addition, in order to further improve the adhesion with the anchor coat layer 2 described later, this film base material is used in consideration of the fact that it may be used as a component of a package having a shape or structure that is physically stressed. It is desirable to provide an easy-adhesion layer on one or both sides. FIG. 2 shows an example in which an easy adhesion layer 7 is provided on the film substrate 1.

  In consideration of manufacturing costs, for example, the easy-adhesion layer 7 is preferably formed by applying a layer of an easy-adhesion resin when a polyamide film serving as a film substrate is stretched. In consideration of resistance to boiling sterilization and heat / pressure sterilization treatment when used as a packaging member, the easy adhesion layer 7 is made of an easy adhesive mainly composed of a water-resistant polyurethane resin and / or polyester resin. Is more desirable.

  As an easily adhesive which has this polyurethane resin and / or a polyester resin as a main component, it may consist of a water-based polyurethane-type resin and a melamine type crosslinking agent, for example, and may consist of a polyester polyol and an isocyanate crosslinking agent.

The anchor coat layer 2 laminated on the easy-adhesion layer 7 on the film substrate 1 is formed with a vapor-deposited thin film layer 3 made of an inorganic compound, which is further laminated thereon, with a uniform thickness. The gas barrier property of the period is sufficiently secured, and the adhesion is dramatically improved. As a result, when boiling sterilization, heating / pressure sterilization, etc. are performed, the gas barrier property does not deteriorate and delamination occurs. It is a thin film layer provided to make it difficult.

  As a constituent material of the anchor coat layer 2, an organic polymer obtained by a two-component reaction between a polyol such as acrylic polyol, polyvinyl acetal, polyester polyol, polyurethane polyol and an isocyanate compound, or a reaction between a polyisocyanate compound and water. Organic compounds having urea bonds, polyethyleneimine or derivatives thereof, polyolefin emulsions, polyimides, melamines, phenols, and inorganic silicas such as organically modified colloidal silica, organic silane compounds such as silane coupling agents and hydrolysates thereof An anchor coat liquid mainly composed of, for example, is mentioned. Among the main components, a combination of an acrylic polyol, an isocyanate compound, and a silane coupling agent is particularly preferable.

  The anchor coat layer 2 is preferably provided by coating so that the thickness after drying is generally in the range of about 0.005 to 5 μm. More preferably, it may be in the range of about 0.01 to 1 μm. When the thickness is less than 0.005 μm, it is difficult to obtain a uniform coating film from the viewpoint of coating technology. On the other hand, when the thickness exceeds 5 μm, the effect of increasing the thickness is not expected, which is uneconomical.

  The vapor-deposited thin film layer 3 made of an inorganic compound provided on the anchor coat layer 2 having such a structure is composed of oxides, nitrides, fluorides such as silicon, aluminum, titanium, zirconium, tin, magnesium, etc. It is a vapor-deposited thin film made of a composite of these, and is formed by a vacuum process such as vacuum vapor deposition, sputtering, or plasma vapor deposition. Among these constituent materials, aluminum oxide, in particular, has a vapor-deposited thin film that is colorless and transparent, and when subjected to boiling sterilization, heating / pressure sterilization, etc., the gas barrier properties, etc., possessed before the treatment are reduced. This makes it possible to develop a wide range of packaging materials.

  Although the appropriate thickness of the vapor deposition thin film layer 3 changes with uses, it is desirable to exist in the range of several tens to 5000 mm. If the thickness is less than 50 mm, there may be a problem in the continuity of the thin film, and if it exceeds 5000 mm, cracks are likely to occur and flexibility is lowered. Preferably, it may be in the range of about 50 to 3000 mm.

The gas barrier coating layer 4 laminated on the deposited thin film layer 3 includes Si (OR ¹ ) ₄ and R ² Si (OR ³ ) ₃ (R ¹ and R ³ are CH ₃ , C ₂ H ₅ , C ₂ H ₄ OCH _{3 and} other hydrolyzable groups, R ² is an organic functional group) and a hydrolyzate thereof, and a gas barrier coating solution mainly composed of a water-soluble polymer having a hydroxyl group. It is a heat-dried film of a thin film.

The gas barrier coating layer 4 constituting a part of the packaging film of the present invention comprises Si (OR ¹ ) ₄ and R ² Si (OR ³ ) ₃ (R ¹ and R ³ are CH ₃ , C ₂ H ₅ , C ₂ H ₄ OCH _{3 and} other hydrolyzable groups react to form a water-resistant network, and a water-soluble polymer having a hydroxyl group also has a hydrogen bond, thus creating a film with high water resistance and barrier properties. be able to.

  The gas barrier coating solution that constitutes the gas barrier coating layer 4 includes isocyanate compounds, clay minerals such as colloidal silica and smectite, stable in consideration of adhesion and wettability with adjacent layers and prevention of cracking due to shrinkage, etc. Known additives such as an agent, a colorant, a viscosity modifier and the like can be added within a range that does not impair gas barrier properties and water resistance.

  The thickness after drying is not particularly limited, but if it exceeds 50 μm, cracks are likely to occur, so it is desirable that the thickness be about 0.01 to 50 μm.

  As a method for forming the gas barrier coating layer 4, a normal coating method can be used. For example, dipping method, roll coating, gravure coating, reverse coating, air knife coating, comma coating, die coating, screen printing method, spray coating, gravure offset method and the like can be employed.

  As a method for drying a thin film made of a gas barrier coating solution, any method can be used such as hot air drying, hot roll drying, high frequency irradiation, infrared irradiation, UV irradiation, etc. Either method is acceptable. Further, two or more such drying methods may be combined.

  A sealing layer 6 is laminated on such a gas barrier coating layer 4 via an adhesive layer 5. The sealing layer 6 is provided so as to be an adhesive portion when a packaging body such as a bag-shaped packaging body is formed using the packaging film of the present invention, and is formed of, for example, a polyolefin resin.

  Examples of polyolefin resins include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-methacrylic acid copolymer, ethylene-methacrylic acid ester copolymer, ethylene-acrylic acid copolymer, and ethylene-acrylic acid ester copolymer. Examples thereof include resins such as coalescence and cross-linked metal thereof.

  Among the polyolefin resins, at least one resin selected from linear low density polyethylene (LLDPE), ethylene / vinyl acetate copolymer (EVA), and ionomer is preferably used. A film made of such a resin has good flexibility, good workability, and good suitability for stored products.

Since the boil sterilization of sugar beet is performed at less than 100 ° C., the seal temperature of the seal layer 6 needs to be higher than the temperature of the boil sterilization so that the seal layer 6 is not heat-sealed to deteriorate the pick-up property of the sugar beet. More specifically, it may be 90 ° C. or higher, preferably 90 ° C. to 120 ° C., particularly preferably about 90 ° C. to 100 ° C. This sealing temperature was the temperature at which a strength of 2 N / mm was exhibited when the strength of the sealed portion sealed for 2 seconds at a sealing pressure of 2 kg / m ² was measured.

  Although the thickness of the sealing layer 6 is determined according to the use of the packaging film, generally it may be in the range of about 15 to 200 μm.

  The seal layer 6 is formed by a dry laminating method in which bonding is performed using a two-component curable urethane adhesive, a non-solvent dry laminating method in which bonding is performed using a solventless adhesive, or a melt-extruded laminating laminate. Any of the methods can be formed by a known lamination method. Lamination of the sealing layer 6 may be performed via the adhesive layer 5.

  The basic structure of the packaging film according to the present invention has been described above, but the packaging film of the present invention has a maximum shrinkage of 3% or less after a boil sterilization treatment at 90 ° C. for 30 minutes and a puncture strength of 8N. It is necessary to be above.

  In measuring the shrinkage rate after boil sterilization treatment, the film flow direction and the 90 ° perpendicular direction are taken as the film width direction, and the shrinkage rate after boil treatment at 90 ° C. for 30 minutes is measured to give a large shrinkage rate. This was the maximum shrinkage rate. The shrinkage rate was calculated using the measurement length before boiling (A) and the measurement length after boiling (B) as follows.

Shrinkage rate (%) = (A−B) / A × 100
The boil treatment at 90 ° C for 30 minutes is a general boil treatment condition. If the shrinkage rate at this time exceeds 3% compared to before the boil treatment, the deposited thin film layer and the gas barrier coating layer follow the shrinkage. It cannot be done and the barrier property is greatly deteriorated. For this reason, the maximum shrinkage after the boil treatment is preferably 3% or less, more preferably 2% or less in both the flow direction and the width direction of the film.

  Typical examples of side dishes include stewed rice and chikuzenni, but these side dishes include hard and horned ones such as bamboo shoots, carrots and lotus roots, which damage the packaging film. There is a risk of causing pinholes in a packaging body such as a packaging bag. For this reason, the packaging film is required to have flexibility, and the puncture strength of the packaging film needs to be 8 N or more in order to prevent the occurrence of pinholes. If it is less than 8N, the pinhole resistance is not excellent, and pinholes are generated during packaging or when the package is transported.

  The puncture strength is the sample strength (N) when a needle having a diameter of 1 mm and a tip shape of 0.5 mmR is pierced at a speed of 50 mm / min on a fixed sample surface (JIS Z1707). The measurement was performed by piercing the needle from the seal surface located on the inner surface side when packaging in consideration of damage caused by the contents.

  A printing layer may be laminated on the gas barrier coating layer 4 as necessary, or a plurality of resin layers may be laminated via an adhesive. Furthermore, the structure which laminated | stacked the laminated sheet etc. in which the some resin layer was laminated | stacked also on the other surface of the film base material 1 via the printing layer, the sealing layer, and the adhesive agent may be sufficient.

  Hereinafter, the packaging film of the present invention will be further described with reference to examples.

First, an anchor coating solution was prepared as follows.
(Preparation of anchor coating solution)
Acrylic polyol and triidyl isocyanate are added so that the amount of NCO group is equal to the OH group of the acrylic polyol, diluted with ethyl acetate so that the total solid content is 5 w%, and then β- (3,4 (Epoxycyclohexyl) trimethoxysilane was added and mixed so as to be 5 wt% based on the total solid content to obtain an anchor coating solution.

Next, (A liquid), (B liquid), and (C liquid) were adjusted as follows, and a gas barrier coating solution was prepared.
(Adjustment of liquid A)
77.9 g of hydrochloric acid (0.1N) was added to 17.9 g of tetraethoxysilane (Si (OC ₂ H ₅ ) ₄ ; hereinafter referred to as TEOS) and 10 g of methanol, and the mixture was stirred for 30 minutes for hydrolysis to obtain a solid content (TEOS SiO ₂ solid content (converted value)) was 5% of the hydrolysis solution (a solution).
(Adjustment of B liquid)
PVA solid content of polyvinyl alcohol 5%, water / methanol = 95/5 (weight ratio) aqueous solution.
(Adjustment of liquid C)
1,3,5-tris (3-trialkoxysilylalkyl) isocyanurate was adjusted with water / IPA = 1/1 solution so that its R ² Si (OH) ₃ solid content (converted value) was 5%. To obtain a hydrolysis solution (C solution).
(Adjustment of gas barrier coating solution)
Liquid A, liquid B and liquid C were mixed in a ratio of 70:20:10 (weight ratio) to form a gas barrier coating solution.

  Using a biaxially stretched nylon film (Unitika Ltd., Emblem ONM) with a thickness of 15 μm with one side corona-treated as the base film, apply a thin film of the anchor coat solution to the corona-treated surface using a gravure coater. Then, an anchor coat layer made of a film having a dry thickness of 0.1 μm was laminated. Next, a deposited thin film layer made of aluminum oxide having a thickness of 2 nm was laminated on the anchor coat layer by a vacuum deposition apparatus. Furthermore, the thin film which consists of a gas barrier coating solution was apply | coated on the vapor deposition thin film layer formed into a film by the said process again using the gravure coater, it heat-dried, and the 0.2-micrometer-thick gas barrier film layer was laminated | stacked. Further, a polyurethane-based adhesive is applied to the gas barrier coating layer surface using a dry laminating machine, and a seal layer (seal temperature 110 ° C.) made of a linear low density polyethylene film having a thickness of 60 μm is laminated. A nylon packaging film for side dish packaging according to Example 1 was obtained.

  A nylon packaging film for side dish packaging according to Example 2 of the present invention was obtained in the same manner as Example 1 except that a 40 μm thick sealing layer was provided using unstretched polypropylene (sealing temperature 125 ° C.).

  A nylon packaging film for side dish packaging according to Example 3 of the present invention was obtained in the same manner as Example 1 except that a 70 μm thick sealing layer was provided using unstretched polypropylene (sealing temperature 145 ° C.).

  Nylon system for sugar beet packaging according to Example 4 for comparison in the same manner as Example 1 except that a nylon film having a high shrinkage rate (maximum shrinkage rate after boiling of 4.2%) was used as the base film. A packaging film was obtained.

  A nylon packaging film for side dish packaging according to Example 5 for comparison was obtained in the same manner as in Example 1 except that a PET film (P60 manufactured by Toray Film Processing Co., Ltd.) having a thickness of 12 μm was used as the base film. .

  A vinylidene chloride coated barrier nylon film (DCR manufactured by Unitika) is used as the barrier nylon film, and a polyurethane adhesive is applied to the gas barrier coating layer surface using a dry laminating machine, and a linear low density polyethylene having a thickness of 60 μm. A sealing layer made of a film (sealing temperature 110 ° C.) was laminated to obtain a nylon packaging film for side dish packaging according to Example 6 for comparison.

Nylon packaging film for sugar beet packaging according to Example 7 for comparison in the same manner as in Example 1, except that EVA (7% VA) (sealing temperature 80 ° C.) was used to provide a sealing layer with a thickness of 40 μm. Got.
(Evaluation)
The puncture strength (JIS Z1707) of the obtained packaging film was measured. Moreover, after making a four-sided pouch (packaging body) with the obtained packaging film and filling it with Chikuzenni, boil treatment (boiling treatment) is performed at 90 ° C. for 30 minutes, and then the contents are taken out. The suitability for taking out was confirmed. The case where there was no heat fusion after the boil treatment and there was no problem in taking out was marked with ◯, and the case where heat fusion was present was marked with ×.

  Moreover, the shrinkage | contraction rate of the flow direction after a boil process and the width direction, and the oxygen permeability after a boil process of the packaging film which comprises the four-way pouch (packaging body) which took out the content were measured. The oxygen permeability was measured in an atmosphere at 30 ° C. and 70% relative humidity using an oxygen permeability measuring device (OXTRAN 10/50 manufactured by Modern Control). Separately from these, 30 four-sided pouches (packaging bodies) made of the obtained packaging film were prepared, each of which was boiled at 90 ° C. for 30 minutes with Chikuzen boiled. Then, three boxes of boiled pouches packed in a total of 10 bags in 2 rows × 5 rows in a cardboard box were prepared. Subsequently, a vibration test corresponding to a truck transport distance of 2000 km was performed on three pouch-packed cardboard boxes based on the JIS vibration test (JIS Z0232). After completion of the test, the sample was stored for 1 month in an atmosphere at 30 ° C. and 70% relative humidity. Then, the color of the boiled Chikuzen boil after storage was visually confirmed, and in each corrugated cardboard box, the one that hardly changed compared to the one before storage was marked with ◯, and even one that turned brown was marked with x.

表１から明らかなように、実施例４に係る惣菜包装用ナイロン系包装用フィルムは、ボイル処理後の収縮率が大きいため、酸素透過度が高く、バリア性が低い。また実施例６に係る惣菜包装用ナイロン系包装用フィルムも同様にバリア性が低く、筑前煮の色も保存中に変色が見られた。また実施例５、７に係る惣菜包装用ナイロン系包装用フィルムでは、突き刺し強度が低いため振動試験中にピンホールが開いたものがあり、３０個の検体中、数個に変色が見られた。また実施例７に係る惣菜包装用ナイロン系包装用フィルムでは保存後に筑前煮を取り出す際、一部熱融着が認められた。これに対し、実施例１、２、３に係る惣菜包装用ナイロン系包装用フィルムはガスバリア性が保存前後で高いため、保存後の筑前煮の変色もみられず、またシール層の融着もないため筑前煮も取り出し易かった。

As is apparent from Table 1, the nylon packaging film for sugar beet packaging according to Example 4 has a high shrinkage rate after the boil treatment, and therefore has a high oxygen permeability and a low barrier property. Similarly, the nylon packaging film for side dish packaging according to Example 6 also had a low barrier property, and the color of Chikuzenni was also discolored during storage. In addition, in the nylon packaging film for side dish packaging according to Examples 5 and 7, there was a pinhole opened during the vibration test due to low puncture strength, and discoloration was observed in several of 30 samples. . In addition, in the nylon packaging film for side dish packaging according to Example 7, when the Chikuzenni was taken out after storage, partial heat fusion was observed. On the other hand, since the nylon packaging film for side dishes packaging according to Examples 1, 2, and 3 has a high gas barrier property before and after storage, no discoloration of Chikuzenni after storage is observed, and there is no fusion of the sealing layer. Therefore, Chikuzenni was easy to take out.

It is explanatory drawing which shows the general | schematic cross-section structure of the film for packaging which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Film base material 2 ... Anchor coat layer 3 ... Deposition thin film layer 4 ... Gas barrier film layer 5 ... Adhesive layer 6 ... Seal layer 7 ... Easy adhesion layer

Claims (3)

An anchor coat layer containing at least acrylic polyol and triidyl isocyanate, an evaporated thin film layer made of an inorganic compound, Si (OR ¹ ) ₄ and R ² Si (OR ³ ) ₃ ( R ¹ and R ³ have a hydrolyzable group such as CH ₃ , C ₂ H ₅ , C ₂ H ₄ OCH ₃ , R ² is an organic functional group) or a hydrolyzate thereof, and a hydroxyl group A gas barrier coating layer that is a heat-dried thin film consisting of a gas barrier coating solution containing a water-soluble polymer as a main component, and a laminated member in which a sealing layer is laminated at least in this relative order, and is 90 ° C. for 30 minutes The maximum shrinkage after the boil treatment is 3% or less, the puncture strength is 8N or more, and the sealing layer is made of a polyolefin resin, Packaging film Lumpur temperature characterized in that it is a 110 ° C. to 145 ° C..   The packaging film according to claim 1, wherein the sealing layer is made of unstretched polypropylene resin and has a sealing temperature of 145 ° C.   A package comprising the packaging film according to claim 1 and 2 in which sugar beet is stored.

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