WO1998036907A1 - Packaging material and package container - Google Patents

Abstract

A packaging material not likely to adsorb or absorb a flavor component when a material containing the flavor component is packaged. The packaging material comprises a polylactic acid layer laminated on the inner surface of a packaging material main body. The polylactic acid layer may be allowed to function as a heat seal layer. The polylactic acid layer has been found difficult to adsorb or absorb the flavor component. Therefore, when contents to be packaged such as beverages, pharmaceuticals, aromatics, deodorants and bath agents are packaged or incorporated by using this packaging material with the polylactic layer on the inner surface the taste, efficacy, flavor, etc., of the materials to be packaged do not drop and change, or are not degenerated.

Description

 Description Packaging materials and packaging containers

 The present invention relates to a product mainly containing a fragrance or a fragrance component, for example, a food or drink. A pharmaceutical or a packaging material suitable for packaging or storing a fragrance or the like as an article to be packaged. . Background art

 2. Description of the Related Art Conventionally, various types of packaging materials, such as those made of glass, metal, or synthetic resin, have been used as packaging materials for packaging or storing items to be packaged, such as foods and drinks and pharmaceuticals. In particular, metal foil or synthetic resin sheets with a heat-sealing layer on the inner surface can be easily packaged simply by wrapping the object to be wrapped and heat-sealing the end green of the package (heat sealing). It is useful because you can do it. For example, a bag is formed from such a packaging material, and after the object to be packaged is stored in the bag, the mouth of the bag is heat-sealed (so-called package packing). ). In addition, after an object to be packaged is housed in a synthetic resin molded container body, an inner lid made of the above-described packaging material is brought into contact with the mouth of the container body to perform heat sealing. As the heat sealing layer used at this time, in general, a layer composed of a modified or unmodified polyolefm-based resin is widely used.

By the way, the food and drink (juice, tea, coffee, spices, chewing gum, candy, chocolate, etc.) ) And pharmaceuticals (haptics, tablets, etc.) contain a small amount of a large number of odorous components, thereby increasing their commercial value. In the case of pharmaceuticals, such aroma components may have a pharmacological action (pharmaceutical effect). In addition, many fragrance components are also possessed for similar purposes in fragrances, deodorants, detergents, bath additives, cosmetics, cleaning cloths, fragrances and pastes other than foods and beverages and pharmaceuticals. .

 The following substances are known as such fragrance components. For example, terpene hydrocarbon compounds such as P—Mentane.Vinene, d—Limonene, Milsen, Terbinene, Karen, Savinen, or _Califorylene, geraniol, nerol, Terpenic anorecol compounds such as citronellal, tenorevineol, lina mouth, meletonore, nerolidol and borneol, or esters thereof, and terpene aldehydes such as citral and citronellal. Danoleols, octanols, benzyl alcohols, enoleols such as eugenol, etc., esters such as ethynoleester sternate, amizo benzoate, and ethyl ester of coco acid; Many organic compounds are known. By combining a plurality of these fragrance components, a unique fragrance is imparted to the food or drink or pharmaceutical product.

However, when the foods and beverages, pharmaceuticals, and the like containing the above-mentioned fragrance components are packaged in a metal foil / synthetic resin sheet having a heat-sealing layer, the fragrance components are sorbed to the heat-sealing layer. There was. In particular, when a material composed of a commonly used modified or unmodified polyolefin resin is used as the heat sealing layer, the sorption may be remarkable. Aroma components are collected in the heat sealing layer When worn, foods and drinks have the disadvantage of changing their taste, and pharmaceuticals have the disadvantage of being difficult to take, in any case reducing their commercial value. In addition, if fragrance components and the like are absorbed into the heat sealing layer, the heat sealing layer may be deteriorated or deteriorated, and the sealing property may be deteriorated. However, during storage, there is a disadvantage that fragrance components such as aroma components and deodorant components (in the case of deodorization by masking, the deodorant component is often an aroma component) leak out. Here, the sorption means that the aroma component and the like are dissolved and diffused in other materials such as the heat sealing layer.

 The degree of sorption (the amount of sorption) of the fragrance component by the heat-sealing layer differs depending on the type of the fragrance component, but a specific fragrance is given by a combination of a plurality of types of fragrance components. In the case of foods and beverages, if a large amount of some odorous components are absorbed, the fragrance of foods and beverages and pharmaceuticals will change, causing a change in taste, etc. In any case, the commercial value of descend. For example, the resin constituting the heat sealing layer may be a resin such as polypropylene, medium-low pressure polyethylene, high pressure polyethylene, or ethylene monovinyl acetate copolymer. When an olefin-based resin is used, terpene-based hydrocarbon compounds are particularly strongly sorbed (having a high degree of sorption), but alcohol- and ester-based odorous components are not so common. If the mixture does not sorb (especially, alcohol-based odor components hardly sorb), and if a mixture of these odor components is possessed, each fragrance component loses balance, and food and beverages and pharmaceuticals The aroma is altered and the value of the product is reduced.

In addition, the decrease in commercial value due to the sorption of such aroma components is as follows. This occurs not only in packaging materials provided with a heat sealing layer but also in other packaging materials. For example, if a synthetic resin sheet is used as the packaging material, the synthetic resin sheet absorbs aroma components, and the commercial value of the packaged food, beverage, pharmaceutical, etc. Sometimes it declined. As for the permeation of the aroma components to the outside of the package, the packaging material should be a metal foil such as aluminum foil or a synthetic resin film with high gas barrier properties. This can be sufficiently prevented. However, it goes without saying that the sorption of fragrance components, fragrances and the like in the packaging material (particularly in the heat sealing layer) as described above cannot be prevented.

For this reason, various materials for packaging materials, in which aroma components are difficult to sorb, have been developed. For example, polyethylene phthalate, ethylene-butyl copolymer or nylon is known to be difficult to absorb odor components (Japanese Patent Application Laid-Open No. 57-16). No. 3654, Japanese Patent Application Laid-Open No. Sho 60-48034). It is also known that a mixture of a polyester and a polyamide is difficult to absorb odor components (Japanese Patent Application Laid-Open No. Sho 61-64449). It is also known that an ethylene-vinyl alcohol copolymer is also difficult to absorb odor components (Japanese Patent Application Laid-Open No. 63-39050). Further, it is known that such an ethylene-vinyl alcohol copolymer is used as a heat-sealing layer of a packaging material (Japanese Utility Model Application Laid-Open No. 63-21031). As the ethylene-butyl alcohol copolymer, a vinyl alcohol content of about 25 to 75 mol% is frequently used. The reason for this is that if the amount of brewed alcohol is less than 25 mol%, the film will have excellent gas barrier properties. This is because, when the content exceeds 75 mol%, it becomes difficult to form a film by extrusion molding. However, such an ethylene-butyl alcohol copolymer has a higher melting point than a modified or unmodified polyolefin resin, and is not easily used as a heat sealing layer. Was. In addition, the above-mentioned resins other than the ethylene-vinyl alcohol copolymer have a much higher melting point than the modified or unmodified polyolefin resin, and are not generally used as a heat sealing layer. .

 An object of the present invention is to find a resin which can be used as a material of a packaging material and has a low odor component sorption under such background art. Further, a resin which can be used as a constituent material of the heat sealing layer (may not be used as a constituent material of the heat sealing layer) may be found. Disclosure of the invention

 The present inventors have conducted experiments using various materials for the above-mentioned purpose, and as a result, have found that polylactic acid is suitable as a material that does not easily absorb odor components. discovered. The fact that a layer made of polylactic acid has a property that it is difficult to absorb odorous components has never been known before and has been discovered by the present inventors. The present invention has been made based on such a finding. That is, the present invention relates to a packaging material characterized in that a polylactic acid layer is laminated on the inner surface of the packaging material body (the inner surface is the surface on the side of the article to be packaged). is there.

The packaging material according to the present invention is obtained by laminating a packaging material body and a polylactic acid layer. The polylactic acid layer polymerizes lactic acid (exactly Is condensation polymerization or polycondensation, but is simply expressed here as polymerization. same as below. ). L-lactic acid includes L-lactic acid and D-lactic acid as optical isomers, and any of them may be used in the present invention. By chemically polymerizing the L-lactic acid and the D- or L-lactic acid, polylactic acid can be obtained. Therefore, the polylactic acid in the present invention is poly L

-Lactic acid, poly-D-lactic acid, and those obtained by copolymerizing L-lactic acid and D-lactic acid at an arbitrary ratio. When forming a polylactic acid layer, each of the above-described polylactic acids may be used alone, or at least two or more kinds of polylactic acids may be mixed and used in an arbitrary ratio. The structural formula of polylactic acid is as follows.

 C H 30

 I II

 H-f O-C H-C O H

The molecular weight of the polylactic acid used in the present invention is not particularly limited. In the case where polylactic acid is previously formed into a film form and laminated on the packaging material body to form a polylactic acid layer, it is necessary to use polylactic acid having good film forming properties. The molecular weight may be about 50,000 to 250,000, particularly preferably about 150,000 to 250,000. When polylactic acid is dissolved in a solvent and used as a solution, which is applied to the packaging material itself to form a polylactic acid layer, the molecular weight is 50,000 to 150 to 150. , Preferably around 0.000. Furthermore, when the polylactic acid is heated and melted, and the packaging material is completely laminated by solventless extrusion coating to form a polylactic acid layer, the molecular weight is 100,000 to 200 to 200. It is preferably about 0, 000. Also, the melting point of the polylactic acid used in the present invention is not particularly limited. In general, the melting point of polylactic acid is preferably in the range of about 100 to 180 ° C. With such a melting point, heat sealing can be easily performed by applying heat and pressure at the time of general heat sealing, and a package or a packaging container having good sealing properties can be obtained.

 To form a polylactic acid film using polylactic acid, for example, the following method is used. That is, polylactic acid is charged into an extruder, heated and melted, extruded from a T-die into a film, and this is cast using a known casting method such as an electrostatic viewing method. Quenched on the surface of the roll to obtain a substantially amorphous, non-oriented polylactic acid phenol. The film thus obtained is an unstretched polylactic acid film, and may be used as it is as a layer constituting a packaging material. In particular, an unstretched polylactic acid film can be sealed at a relatively low heating temperature, so that it is suitable for use as a material for an inner lid mainly for sealing. That is, when the packaging material is used as an inner lid for sealing the mouth of the container body of the packaging container, it is preferable to use a packaging material having an unstretched polylactic acid film layer.

The unstretched polylactic acid film is stretched 2 to 4 times in the longitudinal direction by a roll type longitudinal stretching machine, and then stretched 3 to 5 times in the width direction by a tenter type stretching machine. After heat-treating the obtained two-stretched polylactic acid film as desired, the two-stretched polylactic acid film can be obtained by continuously winding the film while gradually cooling the film. At this time, the stretched polylactic acid film may be formed without stretching in the width direction. Such a two-stretch Stretched polylactic acid films such as polylactic acid film-stretched polylactic acid film are also used as layers constituting various packaging materials. Such a stretched polylactic acid film has relatively improved mechanical properties (especially, tensile strength) in the machine direction or width direction. When a packaging material is produced, a high tensile strength is applied. However, they are preferred because they are difficult to break.

 Regarding the stretching ratio in the longitudinal direction and the width direction, the above-described example is merely an example, and any stretching ratio may be used. In general, the stretch ratio is preferably 1.5 times or more in terms of area ratio, particularly preferably 2 times or more, and most preferably 2.5 times or more. If the stretching ratio is less than 1.5 times the area ratio, the mechanical properties tend not to be sufficiently improved as compared with the unstretched polylactic acid film. In addition, the ability of the odor components to prevent sorption tends to slightly decrease. On the other hand, the upper limit of the draw ratio is generally preferred to be as high as possible, but it is generally reasonable to manufacture it to be 30 times (area ratio). In addition, since the polylactic acid film tends to be improved in transparency by being stretched, it can be suitably used as a material for a packaging material requiring transparency.

The method for producing an unstretched polylactic acid film or stretched polylactic acid film described above is merely one example of the production of the polylactic acid film used in the present invention. In addition, a tenter-type polylactic acid film is also used. A uniaxially stretched polylactic acid film or a biaxially stretched polylactic acid film can be obtained by other known methods such as a stretching method and a tuber method. That is, the unstretched polylactic acid film used in the present invention may be any method as long as it is a conventional unstretched film manufacturing method. As the stretched polylactic acid film used in the present invention, any method may be used as long as it is a conventional stretched film manufacturing method. For example, Japanese Patent Application Laid-Open Nos. Hei 7-204401, Hei 7-300520, Japanese Patent Laid-open No. Hei 8-183895, Hei 8-183989 It can be easily manufactured by the methods described in Japanese Patent Application Laid-Open No. 9-205, Japanese Patent Application Laid-Open No. 8-252895, and Japanese Patent Application Laid-Open No. 8-285858. Although the thickness of the polylactic acid layer such as the polylactic acid film used in the present invention can be arbitrarily determined, it is generally preferably 5 to 2000 μm. It is more preferable that the length is from 10 to 1,0 00 0 m, and it is most preferable that the length is from 20 to 100 m. Reducing the thickness of the polylactic acid layer to less than 5 m can be difficult in manufacturing. In addition, those exceeding 2, 000 m are often unsuitable as packaging materials. The surface of a polylactic acid layer such as a polylactic acid film may be subjected to a surface treatment such as a corona treatment. When such a surface treatment is performed, when printing or the like is performed on the surface of the polylactic acid layer, the ride on the printing ink is improved. In addition, when such a surface treatment is applied to at least one side of the polylactic acid film (the surface to be laminated with the packaging material main body), the affinity with the adhesive when laminating and bonding to the packaging material main body is obtained. And the bonding strength between the packaging material body and the polylactic acid film is improved.

The polylactic acid layer is made of polylactic acid, but a plasticizer or another resin may be slightly contained as another component. As the plasticizer, a natural product such as starch is preferred, and as the other resin, a biodegradable lipophilic polyester is used. In particular, when the packaging material is used as an inner lid for sealing the mouth of the container body, the unstretched polylactic acid film containing a plasticizer should be used. Use is preferred. This is because the flowability of the unstretched polylactic acid film at the time of heat sealing is improved by the presence of the plasticizer, and the heat sealing becomes easy. In the present invention, as the polylactic acid, a copolymer obtained by copolymerizing polylactic acid with another segment such as an aliphatic polyester may be used. Such a polylactic acid can have a relatively low melting point (specifically, it can be arbitrarily adjusted within a range of 100 to 180), and is easily heat-sealed. As a specific example of such a polylactic acid, a lactic acid copolymer (CPLA) manufactured by Dainippon Ink and Chemicals, Inc. can be used.

 In the present invention, the packaging material body refers to a material obtained by removing the polylactic acid layer from the packaging material. Therefore, for example, in the case where the packaging material is obtained by bonding a synthetic resin film and a polylactic acid film with an adhesive, the synthetic resin film and the adhesive are combined to form a packaging material. I say the body. Examples of the packaging material body include a metal foil, a metal deposited film, a metal thin film layer, a metal molded product formed in a predetermined shape, an inorganic compound film layer, Arbitrary materials such as those containing synthetic resin films, those containing synthetic resin molded products, those containing fiber layers, and those containing glass are used.

As the metal foil, it is preferable to use an aluminum foil having a thickness of about 6 to 20 m. As the metal vapor-deposited film, it is preferable to use an aluminum vapor-deposited film having a thickness of about 500 to 1,000 Å. As the metal thin film layer, a metal thin film layer made of a metal or a metal oxide is used. As the inorganic compound-based thin film layer, a thin film layer made of an inorganic oxide is generally used. As a metal molded product Commonly used aluminum cans and steel cans are used. Examples of the synthetic resin film include a polyolefin film such as a polyethylene film and a polypropylene film, and a polyethylene film. Polyester finolems such as lactic acid, polychlorinated butyl phenols, polystyrene films, polycarbonate films, polyamide films, etc. It is preferably used and its thickness is about 5 to 30 ym. As synthetic resin molded products, synthetic resins such as polyolefin resin or polyester resin are generally used, and are used in fixed shapes such as bottles, press-through bags, and pet bottles. What is molded into is used. A knitted fabric, paper, nonwoven fabric, or the like is used as the fiber layer. In general, glass is used in the form of a bottle.

 Further, the packaging material body may be a composite of the various materials described above. For example, laminates such as aluminum foil / polyester film, laminates such as polyvinylidene chloride film / stretched nylon film, stretched nylon film aluminum foil Laminates such as polyester films, laminates such as polypropylene-based films, laminates such as polyvinyl alcohol films / polypropylene films, aluminum It may be a laminate such as a can polyester film. In the case of a laminate, the laminate is often bonded and bonded using an arbitrary adhesive.In addition, the laminate may be bonded by a coating method without using an adhesive or a laminating method. . When an adhesive is used, the thickness of the adhesive layer is preferably about 1 to 10 / m.

The polylactic acid layer and the packaging material body are laminated to form a packaging material . For example, if the packaging material is laminated in the order of a polylactic acid adhesive, an aluminum foil, an adhesive, and a polyester film, the packaging material will be a polylactic acid layer and an adhesive below the adhesive. It consists of the packaging material itself. The polylactic acid layer is laminated on the inner surface of the packaging material body. Here, the inner surface refers to a surface located on the side of the package. Therefore, the polylactic acid layer is located on the side of the package, and often comes into contact with the package. The object to be packaged or stored using the above-described packaging material may be any as long as it has an aroma component. Specifically, foods and drinks such as coffee, juice, tea, spices, sake, various confectionery, curry, red beans, cooked rice, chewing gum, candies, chocolate, etc. Pharmaceutical products such as granules, pills and tablets, detergents, bath additives, fragrances, deodorants, cosmetics such as shampoos, rinses, foundations, and fragrances, and clean cotton fabrics. Examples include clean paper cloths, paints, pastes, etc. Specific examples of the case of packaging or storing an article to be packaged using such a packaging material include the following modes. When the packaging material is in the form of a sheet and the packaged material is used for individual packaging such as chewing gum, candies, bath salts, etc., simply wrap the packaged material with the packaging material and fold it. You only need to glue a part of the At this time, the polylactic acid layer is generally wrapped so as to be on the inner surface, that is, on the side of the package. The polylactic acid layer, depending on its type, has excellent spring packing properties and is suitable as a packaging material for individual packaging. That is, since the folded packaging material has good shape retention, it can be easily maintained in a folded state, and is excellent in packaging. In addition, if the packaged product is a liquid In the case of foods, shampoos, etc., or in the case of powdered coffee, juice, foundations, etc., a bag is formed using the packaging material, and after the material to be packaged is injected from the mouth of the bag, the bag is filled. It is sufficient to seal the mouth by heat sealing. At this time, it goes without saying that a bag is formed such that the polylactic acid layer is on the inner surface, and the polylactic acid layer is sealed as a heat sealing layer. Further, when the packaging material is the inner lid, the polylactic acid layer of the packaging material may be brought into contact with the mouth of the container body, and then heat-sealed.

The packaging material according to the present invention is suitably used as a packaging material for general voucher packaging. It is also suitably used as an inner lid for sealing the mouth of the molded container body. In particular, it is suitably used as an inner lid for packaging an aromatic or deodorant stored in a synthetic resin molded container body. The inner lid can be easily obtained by punching a sheet-like packaging material into a predetermined size. Needless to say, this predetermined size is slightly larger than the mouth of the container body. The inner lid is heat-sealed on the mouth end face of the container body containing the fragrance and the deodorant (when the mouth has a flange, the flange end face is also closed). When the layer (polylactic acid layer) is placed so as to be in contact with it and heat and pressure are applied to the inner lid, the heat sealing layer is melted and the inner lid is bonded to the mouth end surface. As described above, a product in which the fragrance and the deodorant are sealed can be obtained. For example, sealed fragrance products and deodorant products are distributed, stored and sold in that state. When using the fragrance product or the deodorant product, the container body containing the fragrance or the deodorant may be placed in a desired place after the inner lid is peeled off. The container body can be made of any material, Any form may be used. Generally, it is made of synthetic resin, and basically, a cylindrical or conical shape is often used. Perfume products and deodorant products are superior in design, but have higher commercial value, so synthetic resins that are easy to mold are used. In particular, it is preferable to use a polyester resin having excellent durability.

 As described above, using the packaging material according to the present invention in which the inner surface is formed of a polylactic acid layer, a fragrance such as a food and drink, a medicine, a bath additive, a fragrance and a deodorant having various fragrance components. When packaging various types of packaging, such as detergents and detergents, it is difficult for each fragrance component in the packaging to be absorbed into the polylactic acid layer. It has the effect that the taste, medicinal effect and fragrance are hard to change or deteriorate. When the polylactic acid layer functions as a heat-sealing layer, it is not necessary to separately apply a heat-sealing agent to the mouth of the bag when the package is sealed. The package can be sealed by heat sealing. Furthermore, since the polylactic acid layer does not easily absorb fragrance components, its quality and the like are not easily degraded, the initial sealing state can be maintained for a long period of time, and peeling of the heat-sealed portion can occur. It also has the effect of being small.

Since the polylactic acid layer constituting the packaging material according to the present invention has excellent biodegradability when buried in soil, incineration may not be necessary in some cases. In some cases, processing can be performed. In such a case, it can be said that the packaging material according to the present invention is preferable in protecting the global environment. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a schematic sectional view showing a layer structure of a sheet-like packaging material according to an example of the present invention. FIGS. 2, 3, and 4 are schematic cross-sectional views each showing a layer configuration of a sheet-like packaging material according to another example of the present invention. FIG. 5 is a schematic sectional view showing a layer structure of a bottle-shaped packaging material according to an example of the present invention. 1 is a polylactic acid layer, and 2 or less is a packaging material body. Specifically, 2 is an aluminum foil, 2 ′ is an aluminum vapor deposition layer, 3 is a synthetic resin film layer, and 4 and 5 are adhesive layers, respectively. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, the present invention will be described specifically with reference to Examples, but the scope of the present invention is not limited to these Examples. In interpreting the scope of the present invention, the present invention should be interpreted on the basis that the present invention is based on the discovery of the property of a polylactic acid layer that it is difficult to absorb odor components. is there.

 Example Α-1

First, as a packaging material body, a 12-m-thick polyethylene phthalate film (PF2001 manufactured by Nimura Chemical Co., Ltd.) and a 9-m-thick aluminum foil were used. A two-layer structure laminated and bonded with a polyester polyol aliphatic silicate adhesive (Takelac A _515 No Takenate A-10, manufactured by Takeda Pharmaceutical Co., Ltd.) I prepared things. On the other hand, as a polylactic acid layer, a stretched polylactic acid film obtained by the following method was prepared. That is, a polylactic acid having a melting point of 170 to 180 and a molecular weight of about 200,000 is melted by heating and extruded from a T-die to form a film-like material. Double the film in the vertical direction and the width direction The film was stretched at a stretch ratio of 3 times to prepare a stretched polylactic acid film having a thickness of 20 m. Then, the stretched polylactic acid film is dried on the surface of the aluminum foil of the packaging material using a polyester polyol / aliphatic silicate adhesive as an adhesive. Lamination bonding was carried out by the nesion method to obtain a packaging material. The packaging material is cut into quadrilaterals of a predetermined size, and the two sheets are laminated so that the respective stretched polylactic acid films are in contact with each other. Created a 130 mm X 150 mm quadrilateral bag. The following two types of solutions were prepared as articles to be packaged in this packaging material. (I) An ethanol solution containing 500 ppm of each of α-vinyl, d-limone, and milsen, which are aroma components relatively frequently found in foods and beverages. 100 cc was prepared. (Ii) 1-Mentol, d1 One-camphor and methyl salicylate, which are fragrance components (also medicinal components) relatively large contained in pharmaceuticals such as haptics. A 500 cc ethanol solution was prepared at 500 pm. Then, the solution of (i) is stored in the three quadrilateral bags prepared in advance, and the solution of (Π) is stored in the three quadrilateral bags, and the mouth of each bag is heat-sealed. 6 sealed packages were made.

This sealed package is 23. CX 6 After storing for 5 days at an atmosphere of 5% RH, after 5 days, one of the sealed package containing the solution (i) and one sealed package containing the solution (ii) Each solution of (i) and (ii) was taken out, and each fragrance component remaining in each solution was extracted and concentrated, and quantification was performed using a gas chromatograph. Then, the ratio (residual rate) of the content after 5 days to the initial content of each flavor component was calculated. Issued. Similarly, the survival rates after 10 days and 30 days were also revealed. Table 1 shows the residual rates. The residual rate is determined by [(amount of fragrance component after day / amount of initial fragrance component)] XI 00 and is expressed in percentage (%).

 Example A-2

 A two-layer structure consisting of a 12-m-thick polyethylene film and a 500-inch-thick anore-minium vapor-deposited thin film deposited on a 12-m-thick polyethylene film The structure was prepared. On the other hand, as the expanded polylactic acid film as the polylactic acid layer, an expanded polylactic acid film obtained in the same manner as in Example 1 except that the thickness was 38 μm was prepared. Then, a test was conducted in the same manner as in Example 1, and the residual ratio of each flavor component was measured and calculated. The results are shown in Table 1.

 Comparative Example A-1

Conducted except that a 30-m-thick polyethylene film, which is used as a heat-sealing film, was used instead of the 20-m-thick stretched polylactic acid film In the same manner as in Example 1, the residual ratio of each flavor component was measured and calculated. The results are shown in Table 1.

table 1

 (The unit of the residual ratio is%.) As is clear from the results in Table 1, Examples A-1 and A--1 in which the surface in contact with the packaged object was composed of a layer made of a stretched polylactic acid film

When a hermetically sealed package is made using the packaging material according to 2, the amount of each fragrance component contained in the packaged product will be It can be seen that it hardly decreases. In other words, it can be seen that the strength of each aroma component in the packaged object <, and it is difficult to sorb to the packaging material. On the other hand, when a sealed package is made using the packaging material according to Comparative Example A-1 in which the surface to be packaged is in contact with a layer made of polyethylene, It can be seen that each of the fragrance components is almost halved over time. That is, it can be seen that approximately half of each flavor component in the packaged material is sorbed to the packaging material. Therefore, when packaging foods and drinks and pharmaceuticals having various flavor components using the packaging materials according to Examples A-1 and A-2, the taste of the foods and drinks or the medicinal properties of the pharmaceuticals are not easily reduced. It is. On the other hand, when packaging foods and beverages and pharmaceuticals using the packaging material according to Comparative Example A-11, the taste of the food and beverages or the medicinal properties of the pharmaceuticals decrease.

 Example B-1

First, a 12 / m-thick polyethylene lene phthalate film and a 9-μm-thick aluminum foil were used as the main packaging materials. A two-layer laminate was prepared, which was laminated and adhered by a dry lamination method using a solvent type adhesive (Adcoat AD76P-1, manufactured by Toyo Motor Corporation). On the other hand, as a heat sealing layer, a polylactic acid film obtained by the following method was prepared. That is, a polylactic acid having a melting point of 170 to 180 and an average molecular weight of about 200,000 is melted by heating and extruded from a T-die, and has a thickness of 40 ^ m. An unstretched polylactic acid film was prepared. Then, this unstretched polylactic acid film is applied to the aluminum foil surface of the material of the packaging material body as a polyurethane-based solvent-type adhesive (Adcoat AD766). P-1 by Toyo Morton Co., Ltd.) by lamination and bonding to obtain a packaging material. On the other hand, the container body has a volume of 300 cc, an inner diameter of the container mouth (circular mouth) of 60 rnm «5, and a flange width (a flange provided at the end of the mouth and protruding outward). Nine polyester resin wide-mouth containers (blow-molded products) with a width of 3 mm were prepared. Then, three (3) pieces of 50 ml of (1) d-limonine liquid 50 (: c, (2))-vinylene liquid and 50 ml of (3) milsenine liquid, respectively, are stored in the container body. did. After that, the mouth of the container body is sealed with the inner lid obtained by punching the above packaging material slightly larger than the mouth of the container body, and a total of nine fragrance products, three for each identical fragrance product I got To seal the mouth of the container body with the inner lid, make sure that the unstretched polylactic acid film surface of the inner lid is in contact with the end of the mouth of the container. Blocking was performed by applying heat and pressure to the unstretched polylactic acid film. Store the resulting fragrance products (package containing fragrance ingredients) in closed spaces maintained at normal temperature at a temperature of 20 "C. A temperature of 40 ° C and a temperature of 60 ° C. Each day, the sensory inspection was conducted to determine whether or not the fragrance component had leaked, and the results are shown in Table 2.

 Comparative Example Β-1

 As the heat sealing layer, in place of the unstretched polylactic acid film, an ethylene vinyl acetate copolymer film (Melsen F013Τ, manufactured by Tosoichi Co., Ltd., thickness 3 A fragrance product was obtained in the same manner as in Example B-1 except that 0 um) was used, and the leakage was inspected. Table 2 shows the results.

 Comparative Example B-2

As a heat-sealing layer, use a low-melting-point polymer instead of unstretched polylactic acid film. A fragrance product was obtained in the same manner as in Example B-1, except that a polyester resin film (ABF 011C, manufactured by Toseguchi Co., Ltd., thickness 30 m) was used. The leak was inspected. Table 2 shows the results.

 Table 2

なお、 表 2 中、 「漏れなし」 と記載されているのは、 3 0 曰 経過後においても、 芳香成分の漏れを官能により確認できなか つた場合である。 また、 「 1 日」 と記載されているのは、 1 日 経過後において、 芳香成分の漏れを官能により確認できた場合 である。 「 2 日」 及び 「 3 日 」 についても、 2 日経過後及び 3 日経過後において、 芳香成分の漏れを官能により確認できた場 合である。 以上の実施例 B— 1、 比較例 B — 1 及び B — 2 の 結果からも明らかなように、 容器本体の口を密封する内蓋の熱 封緘層として、 ボリ 乳酸層を用いた実施例 B — 1 に係る芳香剤 製品は、 ボリ 乳酸層を用いない比較例 B— 1 及び B― 2 に比べ て、 芳香成分の漏れが少ないこ とが分かる。 このような効果は 、 ポ リ 乳酸層が芳香成分を収着しに く く、 熱封緘層であるボリ 乳酸層が変質を来さないため、 容器本体の口端面と内蓋との接 着強度を高いままに維持できるから、 或いは口端面と内蓋との 間に隙間が生じに く いからであると考えられる。 これに対して 、 ボリ 乳酸層を熱封緘層としない芳香剤製品は、 熱封緘層に芳 香成分が収着し、 变質を起こ し、 接着強度が低下してゆき、 或 いは内蓋と口端面との間に隙間が生じ、 その結果芳香成分が漏 れると考えられる。

In Table 2, “No leakage” is described when leakage of the fragrance component could not be confirmed by sensory even after the passage of 30 years. In addition, the description “1 day” means that the leakage of the fragrance component was confirmed by the sensory after 1 day. For “2 days” and “3 days”, it is the case where leakage of the fragrance component could be confirmed by sensory after 2 days and 3 days. As is clear from the results of Example B-1 and Comparative Examples B-1 and B-2, Example B using a polylactic acid layer as the heat sealing layer of the inner lid for sealing the mouth of the container body. — Air freshener according to 1 It can be seen that the product has less leakage of the fragrance component compared to Comparative Examples B-1 and B-2 in which the polylactic acid layer is not used. This effect is due to the fact that the polylactic acid layer does not easily absorb fragrance components, and the polylactic acid layer, which is the heat sealing layer, does not deteriorate, so that the bonding strength between the mouth end surface of the container body and the inner lid is reduced. It can be considered that the height of the mouth can be kept high, or that a gap does not easily occur between the mouth end surface and the inner lid. On the other hand, in the case of a fragrance product in which the polylactic acid layer is not used as the heat sealing layer, the fragrance component is sorbed to the heat sealing layer, and the quality is reduced, the adhesive strength is lowered, or It is thought that a gap is formed between the lip and the mouth end surface, and as a result, the fragrance component leaks.

Claims

The scope of the claims 1. A packaging material for packaging an object to be packaged, wherein the packaging material comprises a packaging material main body and a polylactic acid layer laminated on an inner surface of the packaging material main body. material. 2. The packaging material according to claim 1, wherein the polylactic acid layer is a heat sealing layer. 3. The packaging material according to claim 1, wherein the polylactic acid layer is a polylactic acid film.  4. The packaging material according to claim 3, wherein the polylactic acid film is a stretched polylactic acid film. 5. The packaging material according to claim 3, wherein the polylactic acid film is an undrawn polylactic acid film.  6. The packaging material according to claim 1, wherein the polylactic acid layer is a layer formed by coating polylactic acid.  7. The packaging material according to claim 1, wherein the packaging material body at least comprises metal foil.  8. The packaging material according to claim 1, wherein the packaging material body includes at least an aluminum vapor deposition layer.  9. The packaging material according to claim 1, wherein the object to be packaged is selected from the group consisting of foods and drinks, pharmaceuticals, fragrances, bath additives, and deodorants. 10. In a packaging container comprising a container body containing an aromatic substance or a deodorant to be packaged and an inner lid for sealing a mouth of the container body, the inner lid is an inner lid body. And a polylactic acid layer laminated on the inner surface of the inner lid body, wherein the polylactic acid layer is used as a heat sealing layer, and an opening of the container body is sealed. Or packaging container for deodorant. 1. The packaging container for an aromatic or deodorant according to claim 1, wherein the container body is formed of a polyester resin.