Composite film for forming self-supporting bags and self-supporting bags

Abstract

To provide a structure formation composite film which does not form a pin hole when making a self-supporting bag even when having a functional material layer including a porous layer, especially even when forming a pouch-type self-supporting bag having a plug, enables bag making and filling packing without forming the pin hole, and a self-supporting bag formed from the structure formation composite film.SOLUTION: In a composite film as a constituent material for forming a structure such as a self-supporting bag, a layer formed by impregnating into or coating a thermoplastic resin on a porous layer is employed, and in the composite film, an intermediate layer is provided between the layer and a heat seal layer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a composite film for forming a structure and a self-supporting bag. [Background technology]

[0002] Standing pouches filled with liquids, solid-liquid mixtures, viscous materials, powders, granules, etc. are highly compressible and flexible, and as such are being increasingly used in a wide range of fields as alternative containers to glass and PET bottles.

[0003] Among such self-supporting bags, in the case of a spouted pouch type self-supporting bag, the contents filled in the pouch are discharged through a spout attached to the pouch.

[0004] However, conventional self-supporting bags lacked rigidity, which meant that they could not stand upright when displayed as a product, the contents would spill out when the storage section was grabbed with the hand during the process of pouring the contents, and the entire container would bend when tilting it to pour, making the pouring outlet unstable.

[0005] In response to this, Patent Document 1 proposes a self-supporting bag (air-hold pouch) in which an independent air chamber with a handle function is provided within the outer edge seal portion that forms the body of the bag. The self-supporting bag described in Patent Document 1 is said to improve the self-supporting ability when the product is displayed and the handling ability when pouring out the contents.

[0006] Furthermore, in addition to self-supporting ability and ease of handling, there are various other required characteristics for self-supporting bags, such as usability and burst strength. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2006-036213 A Summary of the Invention [Problem to be solved by the invention]

[0008] In this regard, the inventors have come up with the idea of ​​meeting various required performance requirements by applying a functional material layer, which is made by impregnating or coating a thermoplastic resin onto a porous layer such as a porous film or nonwoven fabric, to a laminate that constitutes a self-supporting bag.

[0009] However, when a functional material layer having a porous layer is present in a self-supporting bag, pinholes are likely to occur during bag manufacturing. Particularly in the case of self-supporting bags in the form of a spouted pouch, pinholes can occur due to stress when attaching the spout or heat caused by sealing, which can cause the contents to leak.

[0010] The present invention has been made in consideration of the above-mentioned background, and has an object to provide a composite film for forming a structure, which does not generate pinholes during bag making to form a self-supporting bag even if it has a functional material layer with a porous layer, and in particular, which enables bag making and filling without generating pinholes even when forming a self-supporting bag in the form of a spouted pouch, and a self-supporting bag made using the composite film for forming a structure. [Means for solving the problem]

[0011] The inventors of the present invention have conducted extensive research to solve the above problems. As a result, they have found that if a composite film for forming a structure such as a self-supporting bag is made by using a layer in which a thermoplastic resin is impregnated or coated on a porous layer and by disposing an intermediate layer between the porous layer and a heat seal layer, pinholes will not be generated even when stress is applied when attaching a spout, and bag filling will be possible, and they have completed the present invention. That is, the present invention is as follows.

[0012] Aspect 1 A functional material layer, an intermediate layer, and a heat seal layer are laminated in this order, and The functional material layer is a porous layer impregnated with or coated with a thermoplastic resin. Composite film for forming structures. Aspect 2 The composite film for forming a structure according to embodiment 1, wherein the porous layer is a porous film or a nonwoven fabric. Aspect 3 3. The composite film for forming a structure according to aspect 1 or 2, wherein the intermediate layer is a biaxially stretched film. Aspect 4 The composite film for forming a structure according to any one of aspects 1 to 3, wherein the thermoplastic resin has a melting point of 40 to 80°C. Aspect 5 The composite film for forming a structure according to any one of Aspects 1 to 3, wherein the thermoplastic resin has a glass transition temperature of 40 to 80°C. Aspect 6 6. The composite film for forming a structure according to any one of Aspects 4 and 5, wherein the thermoplastic resin is polycaprolactone. Aspect 7 Loss tangent tanδ at 30℃ 30℃ Loss tangent tanδ at 80℃ 80℃ The ratio of tan δ 80℃ / tanδ 30℃ The composite film for forming a structure according to any one of aspects 1 to 6, wherein the viscosity is 1.04 to 5.00. Aspect 8 Further comprising a substrate layer, A composite film for forming a structure according to any one of Aspects 1 to 7, wherein the base layer, the functional material layer, the intermediate layer, and the heat seal layer are laminated in this order. Aspect 9: A self-supporting bag, at least a portion of which is made of the composite film for forming a structure according to any one of the first to eighth embodiments. Aspect 10 A self-supporting bag, at least the body of which is made of the composite film for forming a structure according to any one of the first to eighth embodiments. Aspect 11 11. The self-supporting bag of embodiment 9 or 10, which is in the form of a spouted pouch. Aspect 12 The self-supporting bag according to any one of aspects 9 to 11, which is used in a hot filling method. Effect of the Invention

[0013] According to the composite film for forming a structure of the present invention, even if it has a functional material layer having a porous layer, pinholes are not generated during bag making to form a self-supporting bag, and in particular, even when forming a self-supporting bag in the form of a pouch with a stopper, bag making and filling is possible without generating pinholes.

[0014] Furthermore, the loss tangent tanδ at 30℃ 30℃ Loss tangent tanδ at 80℃ 80℃ The ratio of tan δ 80℃ / tanδ 30℃ By adjusting the thickness of the bag to fall within a specific range, it is possible to produce a self-supporting bag that is soft when filled with the contents by the hot filling method and that can maintain its self-supporting ability as the contents decrease during use. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic cross-sectional view showing one embodiment of a composite film for forming a structure of the present invention. [Diagram 2] 1 is a photograph of the standing pouches produced in the examples and comparative examples. [Diagram 3] 1 is a photograph of a spout attached to a standing pouch produced in an example and a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] <<Composite film for forming structures>> The composite film for forming a structure of the present invention includes a functional material layer, an intermediate layer, and a heat seal layer as essential constituent layers, which are laminated in this order. The functional material layer is formed by impregnating or coating a thermoplastic resin into a porous layer.

[0017] Because the composite film for forming a structure of the present invention has the above-mentioned configuration, even if it has a functional material layer having a porous layer, pinholes are not generated during bag making to form a self-supporting bag, and in particular, even when forming a self-supporting bag in the form of a pouch with a stopper, bag making and filling is possible without generating pinholes.

[0018] Furthermore, the composite film for forming a structure of the present invention has a ratio of loss tangent tanδ at a specific temperature of the entire composite film for forming a structure within a specific range, making it possible to realize a self-supporting bag that is soft when filled with contents by the hot filling method and that can maintain its self-supporting ability as the contents decrease during use.

[0019] <Configuration of composite film for forming structure> The configuration of the structure-forming composite film of the present invention will be described below with reference to the drawings. Fig. 1 shows a schematic cross-sectional view of one embodiment of the structure-forming composite film of the present invention.

[0020] 1, a composite film 100 for forming a structure according to one embodiment of the composite film for forming a structure of the present invention includes a base layer 10, a functional material layer 20 laminated on the inner side of the base layer 10, an intermediate layer 30 laminated on the inner side of the functional material layer 20, and a heat seal layer 40 laminated on the inner side of the intermediate layer 30. The functional material layer 20 is composed of a porous layer 21 and a thermoplastic resin 22 impregnated or applied to the porous layer 21, and is laminated so that the surface impregnated or applied with the thermoplastic resin 22 comes into contact with the intermediate layer 30.

[0021] The composite film for forming a structure of the present invention includes a functional material layer, an intermediate layer, and a heat seal layer as essential components, which are laminated in this order. In the present invention, in addition to the functional material layer, the intermediate layer, and the heat seal layer, any layer may be provided, and examples of the any layer include a base layer and an adhesive layer.

[0022] The composite film for forming a structure 100 shown in FIG. 1 has a functional material layer 20, an intermediate layer 30, and a heat seal layer 40, which are essential constituent layers in the present invention, and also has a base layer 10 as an optional layer.

[0023] In addition, when the composite film for forming a structure of the present invention has a base material layer as an optional layer, it is preferable that the base material layer, functional material layer, intermediate layer, and heat seal layer are laminated in this order.

[0024] The thickness, shape, etc. of the composite film for forming a structure of the present invention can be appropriately determined depending on the application site in the structure to be formed, the use of the structure to be formed, etc.

[0025] <Function of composite film for forming structure> In the composite film for forming a structure of the present invention, an intermediate layer is disposed between a specific functional material layer and a heat seal layer, so that even if the composite film has a functional material layer having a porous layer, pinholes are not generated during bag making to form a self-supporting bag. In particular, even when forming a self-supporting bag in the form of a spouted pouch, it is possible to form and fill the bag without generating pinholes.

[0026] Furthermore, when the ratio of the loss tangent tanδ at a specific temperature of the entire composite film for forming a structure is within a specific range, in addition to the above-mentioned effects, a self-supporting bag can be realized which is soft when filled with contents by the hot filling method, and which has rigidity so that it can maintain its self-supporting ability when the contents decrease during use.

[0027] Specifically, the composite film for forming a structure of the present invention has a loss tangent tanδ at 30° C. 30℃ Loss tangent tanδ at 80℃ 80℃ The ratio of tan δ 80℃ / tanδ 30℃However, when the refractive index is in the range of 1.04 to 5.00, the bag is soft and easily expands at around 60 to 90°C, at which the contents are filled using the hot filling method, making it easy to fill the required amount of contents, and when the contents decrease with use in an environment of 30°C or less, the bag has rigidity and can maintain its independence.

[0028] Loss tangent tanδ at 30℃ 30℃ Loss tangent tanδ at 80℃ 80℃ The ratio of tan δ 80℃ / tanδ 30℃ is preferably in the range of 1.05 to 4.00, and more preferably in the range of 1.18 to 3.50.

[0029] <Functional material layer> The functional material layer is an essential constituent layer in the composite film for forming a structure of the present invention. The composite film for forming a structure of the present invention has a functional material layer, and thus can meet various required properties such as self-supporting property, handling property, usability, and burst strength.

[0030] In the present invention, by adjusting the composition of the functional material layer, the physical properties of the entire composite film for forming a structure can be controlled, and for example, the ratio of the loss tangent tan δ at a specific temperature can be set to a specific range, as described above. As a result, a self-supporting bag can be realized that is soft when filled with contents by the hot filling method and can maintain its self-supporting property when the contents are reduced during use.

[0031] (Composition of functional material layer) The functional material layer constituting the composite film for forming a structure of the present invention has a configuration in which a thermoplastic resin is impregnated or coated on a porous layer.

[0032] In the functional material layer, the entire porous layer may be filled with thermoplastic resin, or a portion of the thermoplastic resin may be disposed inside the porous layer and a portion of the thermoplastic resin may be laminated on the surface of the porous layer.

[0033] The composite film 100 for forming a structure shown in Figure 1 forms a functional material layer 20 in which a portion of the thermoplastic resin 22 is disposed inside the porous layer 21 and a portion of the thermoplastic resin 22 is laminated on the surface of the porous layer 21.

[0034] 1, in a composite film 100 for forming a structure according to one embodiment of the composite film for forming a structure of the present invention, a functional material layer 20 is disposed between a base material layer 10 and an intermediate layer 30. The functional material layer 20 is composed of a porous layer 21 and a thermoplastic resin 22 impregnated or applied to the porous layer 21, and the heat seal layer 40 is disposed so that the surface impregnated or applied with the thermoplastic resin 22 faces the intermediate layer 30 and is adjacent to the intermediate layer 30.

[0035] In the functional material layer 20 in the composite film 100 for forming a structure according to one embodiment of the composite film for forming a structure shown in FIG. 1, the surface impregnated with or coated with the thermoplastic resin 22 faces the intermediate layer 30, but in the present invention, the surface impregnated with or coated with the thermoplastic resin may be located on either the intermediate layer side or the base material layer side.

[0036] {Porous layer} The porous layer constituting the functional material layer is a layer having a large number of voids. The voids may either penetrate the layer in the thickness direction or be discontinuous. In the present invention, by making the layer constituting the functional material layer a porous layer, the large number of voids present in the layer can be filled by impregnating or coating with a thermoplastic resin described below.

[0037] The form of the porous layer is not particularly limited, but is preferably a porous film or nonwoven fabric.

[0038] The material constituting the porous layer is not particularly limited, but may be, for example, a thermoplastic resin or a thermosetting resin such as polyesters, such as polyethylene terephthalate (PET) or polylactic acid, or polyamides (PA), such as nylon-6 or nylon-66, or a natural material, such as pulp.

[0039] When the porous layer is a nonwoven fabric made of fibers, any of needle punched nonwoven fabric, water jet punched nonwoven fabric, spunbonded nonwoven fabric, etc. can be used.

[0040] The basis weight and thickness of the porous layer used in the present invention are not particularly limited, and can be appropriately selected depending on the type and amount of the thermoplastic resin to be impregnated or applied.

[0041] {thermoplastic resin} The thermoplastic resin impregnated or applied to the porous layer is not particularly limited as long as it is a material having thermoplastic properties. In the present invention, the "thermoplastic resin" includes not only thermoplastic resins but also thermoplastic elastomers.

[0042] Examples of thermoplastic resins include, but are not limited to, paraffin wax, polycaprolactone, polyester, polyamide, polylactic acid, and thermoplastic elastomers.

[0043] In the present invention, by adjusting the type and amount of the thermoplastic resin impregnated or applied to the porous layer, the physical properties of the entire composite film for forming a structure can be controlled, and for example, the ratio of the loss tangents tanδ described above can also be controlled.

[0044] The composite film for forming a structure of the present invention has the above-mentioned loss tangent tanδ at 30° C. 30℃ Loss tangent tanδ at 80℃ 80℃ The ratio of tan δ 80℃ / tanδ 30℃ In order to make the melting point of the functional material layer fall within the range of 1.04 to 5.00, for example, a material having a melting point within a specific range may be used as the thermoplastic resin. In other words, the functional material layer contains a thermoplastic resin having a melting point within the specific range.

[0045] Specifically, it is preferable that the porous layer is impregnated with or coated with a thermoplastic resin having a melting point in the range of 40 to 80° C. The melting point of the thermoplastic resin is more preferably in the range of 40 to 70° C., and particularly preferably in the range of 40 to 60° C.

[0046] Examples of substances having a melting point within the above range include fats and oils such as polycaprolactone, saturated fatty acids, and fatty acid triglycerides, higher alcohols, waxes, and surfactants (anionic, cationic, nonionic).

[0047] Another loss tangent tanδ at 30℃ 30℃ Loss tangent tanδ at 80℃ 80℃ The ratio of tan δ 80℃ / tanδ 30℃ In order to make the glass transition temperature (Tg) of the functional material layer fall within the range of 1.04 to 5.00, it is preferable to impregnate or coat the porous layer with a thermoplastic resin having a glass transition temperature (Tg) within a specific range. In other words, the functional material layer contains a thermoplastic resin having a glass transition temperature (Tg) within the specific range.

[0048] Specifically, the porous layer is preferably impregnated with or coated with a thermoplastic resin having a glass transition temperature (Tg) of 40 to 80° C. The glass transition temperature (Tg) of the thermoplastic resin is more preferably in the range of 40 to 70° C., and particularly preferably in the range of 40 to 60° C.

[0049] Examples of substances having a glass transition temperature (Tg) in the above range include polycaprolactone, specific grades of shape memory polymers (SMPs), polyamides, or polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polylactic acid, etc. The shape memory resin (SMP) is preferably a thermoplastic resin.

[0050] (Impregnation or coating method) The method for impregnating or coating the thermoplastic resin into the porous layer is not particularly limited, and any known method can be used, such as gravure coating, dipping, suction, air knife coating, die coating, comma coating, fountain coating, gravure offset, etc.

[0051] (Amount of impregnation or application) The amount of thermoplastic resin to be impregnated or applied to the porous layer is not particularly limited, and can be appropriately selected depending on the basis weight, pore size, thickness, and type of thermoplastic resin of the porous layer, as well as the physical properties of the composite film for forming a structure to be formed.

[0052] <Middle Class> The intermediate layer is an essential layer in the composite film for forming a structure of the present invention. The intermediate layer is disposed between the functional material layer and the heat seal layer, and serves to reinforce the strength of the functional material layer including the porous layer.

[0053] In the composite film for forming a structure of the present invention, an intermediate layer is present between the functional material layer and the heat seal layer, so that even if the composite film has a functional material layer having a porous layer, pinholes are not generated during bag making to form a self-supporting bag. In particular, even when forming a self-supporting bag in the form of a spouted pouch, bag making and filling can be carried out without generating pinholes.

[0054] In the composite film 100 for forming a structure according to one embodiment of the composite film for forming a structure of the present invention shown in FIG. 1, the intermediate layer 30 is disposed between the functional material layer 20 and the heat seal layer 40.

[0055] The intermediate layer is not particularly limited, but is preferably a solid resin film, and more preferably a biaxially stretched film.

[0056] The material constituting the intermediate layer is not particularly limited, but may be, for example, polyester such as polyethylene terephthalate (PET) or polylactic acid, or polyamide (PA) such as nylon-6 or nylon-66.

[0057] In the present invention, the thickness of the intermediate layer is not particularly limited, and can be appropriately set depending on the strength of the functional material layer to be used in combination.

[0058] <Heat seal layer> The heat seal layer is an essential layer in the composite film for forming a structure of the present invention. The heat seal layer is a layer that is heat-sealed when forming a structure such as a self-supporting bag. For this reason, the heat seal layer is disposed so as to be the innermost layer of the composite film for forming a structure.

[0059] The material constituting the heat seal layer is not particularly limited as long as it is heat-adhesive and can impart sufficient seal strength to the molded structure. Known materials can be used, such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), polypropylene (PP), ethylene-propylene copolymer (EP), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ionomer resin, ethylene-vinyl acetate copolymer (EVA), etc.

[0060] For example, when forming a structure such as a self-supporting bag filled with contents, the heat seal layer constituting the composite film for forming a structure of the present invention becomes a layer that forms a space for filling the contents. Therefore, when it is desired to impart resistance to contents, it is preferable to use, for example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), etc.

[0061] The heat seal layer may be formed using a film preformed from the above-mentioned materials, or may be formed by melting and extruding a material for forming the heat seal layer onto the surface of a laminate comprising a functional material layer, an intermediate layer, and, if necessary, other layers, and then cooling and solidifying the material.

[0062] In addition, the resins constituting the heat seal layer may be not only one type but also a blend of two or more types, and additives for imparting functionality, etc. may be blended as necessary.

[0063] <Base material layer> The substrate layer is an optional layer in the composite film for forming a structure of the present invention. The composite film for forming a structure of the present invention has the functional material layer, the intermediate layer, and the heat seal layer as essential constituent layers, but may also include a substrate layer in addition to these.

[0064] When the composite film for forming a structure of the present invention includes a base layer, it is preferable that the base layer, the functional material layer, the intermediate layer, and the heat seal layer are laminated in this order.

[0065] In the case where the base material layer, the functional material layer, the intermediate layer, and the heat seal layer are laminated in this order, the base material layer becomes the outer layer of the bag body when a structure such as a self-supporting bag is formed. Therefore, it can be a protective layer when the heat seal layer, which is the innermost layer, is heat-sealed to form a structure. It can also be a printing layer for printing to display the contents, etc.

[0066] The material constituting the base layer is not particularly limited as long as it is a resin, particularly a resin that can be used as a protective layer and can be printed on. Commonly used resins can be used, such as polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT), polyolefins such as polyethylene (PE), polypropylene (PP), and polystyrene (PS), polyamides (PA) such as nylon-6 and nylon-66, and polycarbonate (PC).

[0067] The resin constituting the base layer may be one type or a blend of two or more types, and additives for imparting functionality, etc. may be blended as necessary.

[0068] The base layer is preferably made of a preformed film. The film to be the base layer may be a film formed from the above-mentioned resin or the like, and may be unstretched or uniaxially or biaxially stretched. Among them, a biaxially stretched film is preferable.

[0069] Furthermore, a metal such as aluminum or an oxide such as silicon oxide or aluminum oxide may be vapor-deposited on the film that serves as the base layer.

[0070] <Other layers> The composite film for forming a structure of the present invention may contain layers other than the functional material layer, intermediate layer, and heat seal layer as essential constituent layers. The other layers may be disposed between the essential constituent layers of the functional material layer, intermediate layer, and heat seal layer, or on the outside of the laminate containing these layers.

[0071] The other layers are not particularly limited, and examples thereof include a barrier layer for imparting barrier properties to the structure to be produced, a reinforcing layer for reinforcing the strength of the structure, and an adhesive layer for bonding between layers.

[0072] Examples of the barrier layer for imparting barrier properties to the structure to be produced include layers made of ethylene-vinyl alcohol copolymer (EVOH), nylon (NY), polyvinylidene chloride (PVDC), or polyacrylonitrile (PAN), which exhibit the function of blocking gases such as oxygen and water vapor.

[0073] Examples of materials for the reinforcing layer for reinforcing the strength of the structure to be produced include paper, synthetic paper, nonwoven fabric, etc. These may be coated with an adhesive to impart adhesion to adjacent layers.

[0074] Examples of adhesive layers for bonding layers include layers made of ethylene-acrylic acid copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), and ionomer.

[0075] The adhesive layer may be a layer made of an adhesive used when dry laminating or hot melt laminating a functional material layer, an intermediate layer, a heat seal layer, or the like.

[0076] The resins constituting the other layers may be one type or a blend of two or more types. In addition, additives for imparting functionality, etc. may be blended as necessary.

[0077] <<Method for manufacturing composite film for forming structure>> The method for producing the composite film for forming a structure of the present invention is not particularly limited, and any method capable of forming a laminated composite film may be used. Known methods may be adopted, such as dry lamination, hot melt lamination, extrusion lamination, and sandwich lamination.

[0078] 《Structure》 The structure formed by using the composite film for forming a structure of the present invention is not particularly limited. Since the composite film for forming a structure of the present invention has an innermost layer as a heat seal layer, structures of various shapes can be formed by heat fusion.

[0079] Examples include three-sided sealed bags, four-sided sealed bags, gusset packaging bags, pillow packaging bags, Gabeltop-type bottomed containers, Tetra Classic (registered trademark), Brick Pack (registered trademark), tube containers, lids, etc. Also, a zipper can be provided on the heat seal layer to form a zippered packaging bag.

[0080] In the present invention, among these, a self-supporting bag at least a part of which is made of the composite film for forming a structure of the present invention is preferable, and among these, a self-supporting bag at least the body of which is particularly preferable is a self-supporting bag at least the body of which is made of the composite film for forming a structure of the present invention.

[0081] Furthermore, the structure formed using the composite film for forming a structure of the present invention is preferably a self-supporting bag in the form of a spouted pouch, that is, a self-supporting bag with a spout.

[0082] In the composite film for forming a structure of the present invention, an intermediate layer is present between the functional material layer and the heat seal layer, so that even if the composite film has a functional material layer having a porous layer, pinholes are not generated during bag making to form a self-supporting bag. In particular, even when forming a self-supporting bag in the form of a spouted pouch, bag making and filling can be carried out without generating pinholes.

[0083] In addition, the composite film for forming a structure of the present invention has a loss tangent tanδ at 30° C. 30℃ Loss tangent tanδ at 80℃ 80℃ The ratio of tan δ 80℃ / tanδ 30℃ In the case where the ratio is 1.04 to 5.00, the bag is preferably a self-supporting bag used in a hot filling method.

[0084] When the composite film for forming a structure of the present invention has the above physical properties, the obtained self-supporting bag is soft when filled with contents by the hot filling method, and can maintain its self-supporting property when the contents are reduced during use. Therefore, since the bag easily expands when filled with contents, it is easy to fill the required amount of contents, while, since it has rigidity when the contents are used, it can maintain its self-supporting property.

[0085] Applicable Contents The contents that can be filled into the structure formed from the composite film for forming a structure of the present invention are not particularly limited as long as they are liquids including gels, gels, pastes, etc. Examples of liquids include medicines, quasi-drugs, cosmetics, detergents, foods, paints, etc.

[0086] Examples of pharmaceuticals and quasi-drugs include injections, drip infusions, infusions, perfusions, and decoctions. Examples of cosmetics include shampoos, conditioners, and hair styling products (e.g., hair water, hair liquid, grease, and the like). Examples of detergents include neutral detergents, alkaline detergents, and acidic detergents. Examples of foods include beverages, edible oils, soups, creams, and liquid seasonings (e.g., soy sauce, vinegar, noodle soup, warishita, mirin, Worcestershire sauce, ketchup, Tabasco, sweeteners, and the like). Examples of paints include paints, varnishes, and oil stains.

[0087] The contents may be in the form of a gel, gel or paste, and examples of such contents include toothpaste, wasabi, jelly, jam, miso, etc. EXAMPLES

[0088] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these.

[0089] Examples 1 to 4 and Comparative Examples 1 to 5 <Material> The following materials were prepared to form the layers:

[0090] (1) Base material layer PET#12: PET film (Embret (registered trademark) PET-12, Unitika Ltd., thickness: 12 μm) Ny#15: Nylon film (RX, Kohjin Film & Chemicals Co., Ltd., thickness: 15 μm)

[0091] (2) Functional material layer Porous Layer Polylactic acid nonwoven fabric (Terramac (registered trademark) L0303, Unitika Ltd., basis weight: 30 g / m 2 ) Paper 40g: Pure white roll paper (grammage: 40g / m 2 ) thermoplastic resin PCL: Polycaprolactone (Placcel (registered trademark) H1P, Daicel Corporation)

[0092] (3) Middle class NY: Biaxially oriented nylon film (Bonyl (registered trademark), Kohjin Film & Chemicals Co., Ltd., thickness: 15 μm) VM-PET#12: Aluminum-deposited PET film (VM-PET BR-1012, Toray Advanced Film Co., Ltd., thickness: 12 μm)

[0093] (4) Heat seal layer LL♯50: LLDPE film (SE625L, Tamapoly Corporation, thickness: 50μm) ·LL♯80: LLDPE film (SE625L, Tamapoly Corporation, thickness: 80μm) ·LL♯95: LLDPE film (SE620A, Tamapoly Corporation, thickness: 95μm) ·LL♯100: LLDPE film (SE625L, Tamapoly Corporation, thickness: 100μm) ·LL♯45: [Extruded PE#15 / LL#30] laminated film (thickness: 45μm) (Extruded PE: Suntec (registered trademark) L1850K, Asahi Kasei Corporation LL#30: LLDPE film (SE625L, Tamapoly Corporation, thickness: 30 μm) ·LL♯65: [Extruded PE#15 / LL#50] laminated film (thickness: 65μm) (Extruded PE: Suntec (registered trademark) L1850K, Asahi Kasei Corporation LL#50: LLDPE film (SE625L, Tamapoly Corporation, thickness: 50 μm)

[0094] <Manufacturing of functional material layer> 40 g of polylactic acid nonwoven fabric or paper to be the porous layer was attached to the base layer by dry lamination in the lamination order shown in Table 1. A two-component curing dry lamination adhesive (Takelac A525 / Takenate A52, Mitsui Chemicals, Inc.) was used as the dry lamination adhesive.

[0095] In Table 1, the parts that were dry laminated are indicated with " / / ".

[0096] A coating solution was prepared by dissolving polycaprolactone (PCL), a thermoplastic resin, in toluene. The coating solution was applied to the polylactic acid nonwoven fabric that would become the porous layer at a coating amount of 5 g / m2. 2 The functional material layers of Examples 1 to 3 and Comparative Examples 1 to 3 were prepared by gravure coating the functional material layers laminated on the base layer so that the coating amount was 10 g / m 2 By applying gravure coating to the substrate layer so as to form a functional material layer of Example 4 laminated on the substrate layer.

[0097] Similarly, the coating solution was applied to 40 g of paper at a coating weight of 4.4 g / m 2 The functional material layer used in Comparative Example 4 was prepared by gravure coating.

[0098] <Production of composite film for forming structure> A composite film for forming a structure was produced by bonding the intermediate layer and / or the heat seal layer by dry lamination in the lamination order shown in Table 1. As the adhesive for dry lamination, a two-component curing type dry lamination adhesive (Takelac A525 / Takenate A52, Mitsui Chemicals, Inc.) was used.

[0099] <Measurement of loss tangent tanδ> Using a dynamic viscoelasticity device (DMA Q800, TA Instruments, Inc.), the loss tangent tanδ at 80°C and 30°C was measured for the composite film for forming a structure prepared in each Example shown in Table 1. 30℃ Loss tangent tanδ at 80℃ 80℃ The ratio of tan δ 80℃ / tanδ 30℃ was calculated.

[0100] Specifically, the loss tangent tanδ was measured at temperatures between 25 and 100°C, and the value at 30°C was taken as the loss tangent tanδ at 30°C. 30℃The value at 80°C is tan δ at 80°C. 80℃ The ratio of these is tan δ 80℃ / tanδ 30℃ was calculated. tan δ at 30°C 30℃ , tan δ at 80°C 80℃ , and the ratio of these, tan δ 80℃ / tanδ 30℃ are shown in Table 1.

[0101] <Making a self-supporting bag> Using a bag making and filling machine (OnPack13000US, Orihiro Co., Ltd.), a standing pouch with a spout and filled with water was produced as shown in Figure 2. The pouch dimensions were height (H) 135 mm × width (W) 90 mm × gusset depth 25 mm.

[0102] The spout attached to the pouch was molded from polyethylene resin and has the shape shown in Figure 3. Figure 3(a) is a front photograph of the spout, Figure 3(b) is a bottom photograph, and Figure 3(c) is a top photograph. The conditions for producing the standing pouch with a spout were a heat seal temperature of 135°C, ultrasonic output of 250 J, and pressure of 0.55 MPa.

[0103] <Evaluation of bag filling suitability> The bag-making and filling suitability of the produced standing pouches was evaluated according to the following criteria. The results are shown in Table 1. 〇: No leakage from the standing pouch ×: Liquid leaks from the standing pouch

[0104] <Evaluation of independence> After the contents were cooled to room temperature and then discharged all at once, the standing pouch was evaluated for its ability to stand on its own according to the following criteria. The results are shown in Table 1. 〇: Become independent ×: Not self-supporting

[0105] [Table 1]

[0106] As shown in Table 1, the self-supporting bags made from the composite films for forming structures of Examples 1 to 4 had an intermediate layer between the functional material layer and the heat seal layer, so in addition to being self-supporting, they also had excellent suitability for spout attachment, no liquid leaked from the pouches produced, and excellent bag making and filling properties.

[0107] On the other hand, the self-supporting bags made from the composite films for forming structures in Comparative Examples 1 to 4 had excellent self-supporting properties due to the presence of a functional material layer, but pinholes occurred during bag making and filling, especially at the spout attachment area, and liquid leakage was observed from the pouch.

[0108] Moreover, the self-supporting bag of Comparative Example 5, which did not have a functional material layer, did not have the self-supporting property. [Explanation of symbols]

[0109] 100 Composite film for structural formation 10 Base material layer 20 Functional material layer 21 Porous layer 22 Thermoplastic resin 30 Middle Class 40 Heat seal layer

Claims

1. A base layer, a functional material layer, an intermediate layer, and a heat seal layer are laminated in this order, and The functional material layer is a porous layer impregnated with or coated with a thermoplastic resin, the porous layer is a porous film or a nonwoven fabric, The thermoplastic resin has a melting point of 40 to 80° C. the intermediate layer is a solid resin film; and The ratio of the loss tangent tanδ 80 ° C. at 80 ° C. to the loss tangent tanδ 30 ° C. at 30 ° C., tanδ 80 ° C. / tanδ 30 ° C., is 1.04 to 5.00; Composite film for forming self-supporting bags.

2. 2. The composite film for forming self-supporting bags according to claim 1, wherein the intermediate layer is a biaxially oriented film.

3. The composite film for forming a self-supporting bag according to claim 1 or 2, wherein the thermoplastic resin has a glass transition temperature of 40 to 80°C.

4. The composite film for forming a self-supporting bag according to any one of claims 1 to 3, wherein the thermoplastic resin is polycaprolactone.

5. A self-supporting bag, at least a portion of which is made of the self-supporting bag-forming composite film according to any one of claims 1 to 4.

6. A self-supporting bag, at least a body portion of which is made of the self-supporting bag-forming composite film according to any one of claims 1 to 4.

7. 7. The self-supporting bag according to claim 5 or 6, which is in the form of a spouted pouch.

8. The self-supporting bag according to any one of claims 5 to 7, which is used in a hot filling method.

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