Laminated films, greenhouse horticulture films, and woven or knitted fabrics

Abstract

The purpose of this invention is to provide a laminated film, a greenhouse horticulture film, and woven or knitted fabrics, etc., wherein the laminated film does not hinder plant growth, has excellent durability, and can maintain high light transmittance. The laminated film of this invention has a heat-reflecting layer and a surface functional layer on at least one side of the aforementioned heat-reflecting layer, and the aforementioned surface functional layer is formed of a resin composition comprising particles and resin, wherein the average particle size of the aforementioned particles is 4 μm to 10 μm, and the aforementioned particles comprise 0.3 parts by mass to 1.5 parts by mass relative to 100 parts by mass of the aforementioned resin.

Description

Laminated films, greenhouse horticulture films, and woven or knitted fabrics This invention relates to a laminated film, and horticultural films and woven or knitted fabrics using the aforementioned laminated film. The laminated film does not block plant growth, has excellent durability, and can maintain high light transmittance. To date, films with far-infrared reflectivity and visible light transmittance have been proposed for use in agricultural greenhouses (see, for example, Patent Documents 1 and 2). However, while these films possess reflectivity due to the inclusion of a metal layer, their visible light transmittance is low. Additionally, films with an ultraviolet blocking layer have also been proposed, but these do not offer sufficient performance. In addition, ultra-multilayer films that ensure visible light transmittance and are endowed with ultraviolet blocking have been proposed (for example, see Patent Document 3). However, the durability of films made by incorporating ultraviolet absorbers into the film resin, for example, when used as films for agricultural greenhouses, is still insufficient. In addition, a solar control film with heat ray reflection function using a multilayer film has been proposed (for example, see Patent Document 4). Furthermore, as a film for agricultural greenhouses, a film with heat ray reflection function, high total light transmittance, and high light diffusion function has been proposed (for example, see Patent Document 5). However, these films cannot achieve sufficient durability performance, for example, in the harsh, humid, and hot environment inside agricultural greenhouses. Therefore, there is currently no film that possesses excellent visible light transmittance and infrared reflectance, and also exhibits sufficient durability even in the harsh, hot and humid environment of agricultural greenhouses, meeting the performance requirements for agricultural films. [Prior Art Documents] [Patent Documents] [Patent Document 1] Japanese Patent No. 5464567. [Patent Document 2] Japanese Unexamined Patent Application Publication No. 2012-206430. [Patent Document 3] Japanese Patent No. 6780636. [Patent Document 4] Japanese Patent No. 5513373. [Patent Document 5] Japanese Unexamined Patent Application Publication No. 2020-179643. [The problem that the invention aims to solve] In view of the above-mentioned situation, the present invention aims to provide a laminated film, a greenhouse horticulture film, and woven or knitted fabrics, etc., wherein the aforementioned laminated film does not hinder plant growth, has excellent durability, and can maintain high light transmittance. [Means for solving the problem] The inventors discovered that by using a laminated film with a laminated structure having a specific resin layer, the above-mentioned problems can be solved, and thus the present invention was completed. That is, the present invention provides the following laminated film. [1] A laminated film having a heat-reflecting layer and a surface functional layer on at least one side of the heat-reflecting layer, wherein the surface functional layer is formed of a resin composition comprising particles and resin, wherein the average particle size of the particles is 4 μm to 10 μm and the particles comprise 0.3 to 1.5 parts by mass relative to 100 parts by mass of the resin. [2] As described in [1], the laminated membranes in which the aforementioned particles are organic particles. [3] As described in [1] or [2], the aforementioned heat radiation reflective layer comprises a multilayer laminated film, wherein the aforementioned multilayer laminated film is formed by alternately laminating at least 20 or more layers of at least two resin layers with different refractive indices in the thickness direction. [4] The laminated film described in any of [1] to [3], wherein the resin composition comprises an ultraviolet absorber having a triazine skeleton. [5] The laminated film described in any of [1] to [4], wherein the resin contained in the resin composition includes a resin as an adhesive component. [6] As described in [5], the laminated film wherein the resin used as an adhesive component comprises an acrylic resin. [7] The laminated film described in any one of [1] to [6], wherein the average transmittance of the laminated film is 70% or more at wavelengths from 400 nm to 800 nm and the average transmittance is 20% or less at wavelengths from 900 nm to 1000 nm. In addition, the present invention provides the following facility gardening film. [8] A membrane for facility horticulture, comprising a laminated membrane as described in any one of [1] to [7]. In addition, the present invention provides the following woven or knitted fabrics. [9] A woven or knitted fabric comprising tapes obtained by cutting a laminated film as described in any one of [1] to [7]. [Inventive Benefits] The laminated film of the present invention, by having the above-described structure, can become a film that does not block plant growth, has excellent durability and adhesion, and maintains high light transmittance. Furthermore, by using the aforementioned laminated film, the greenhouse horticulture film and woven or knitted fabric of the present invention can easily suppress the temperature rise inside the greenhouse, promote plant growth in the long term, and have high durability even in the harsh and humid environment of the outdoors, such as in agricultural greenhouses. The following describes in detail the embodiments of the present invention, but the present invention is not limited to these embodiments. Furthermore, in this specification, the numerical range indicated by "to (~)" means the range including the values ​​recorded before and after "to" as the lower and upper limits. [Laminated Film] The laminated film of the present invention has a heat-reflecting layer and a surface functional layer on at least one side of the heat-reflecting layer, and the surface functional layer is composed of a resin composition comprising particles and resin, wherein the average particle size of the particles is 4 μm to 10 μm, and the particles comprise 0.3 to 1.5 parts by mass relative to 100 parts by mass of the resin. Furthermore, in this invention, visible light refers to light with wavelengths from 400 nm to 800 nm, and thermal rays refer to light with wavelengths from 800 nm to 1400 nm. [Heat Reflective Layer] The heat reflective layer of the present invention can be adapted to use known layers with heat reflective function. The aforementioned heat reflective layer can be formed, for example, by means of a multilayer laminated film, wherein the aforementioned multilayer laminated film is formed by alternately laminating multiple layers of at least two resin layers with different refractive indices in the thickness direction. As the aforementioned multilayer laminated film, for example, it is a layer formed by alternately depositing 20 or more layers of a first resin layer (hereinafter also referred to as "the first layer") and a second resin layer (hereinafter also referred to as "the second layer") with different refractive indices in the thickness direction on the outermost layer (hereinafter also referred to as "multilayer laminated structure"). The aforementioned multilayered structure is preferably constructed in such a way that it forms the outermost layer of the heat ray reflector. The thickness of the aforementioned heat-reflecting layer can be adjusted according to the application, for example, in the range of 20μm to 150μm, or 22μm to 100μm, 25μm to 80μm, or 40μm to 60μm. If the thickness is thinner, it has the advantages of being lightweight and improving workability. As long as the aforementioned multilayered structure meets the above-described requirements and has the function of allowing visible light from sunlight to pass through while selectively reflecting thermal rays, there are no particular limitations. In the reflection obtained by alternating layers of resin with different refractive indices, the reflected wavelength can be designed using the optical thickness (refractive index × physical thickness) of the resin layers, and the reflectivity can be designed using the total number of resin layers and the refractive index difference between the resin layers. This allows for the selection of resins and the adjustment of the thickness or number of resin layers to achieve the desired reflection characteristics. To ensure proper transmission of visible light and selective reflection of thermal rays through the aforementioned multilayered structure, the difference in average refractive index in the in-plane direction between the two resin layers is preferably at least 0.03. Furthermore, the multilayered structure comprises at least 15 resin layers with an optical thickness of 100 nm to 400 nm, preferably 150 nm to 360 nm. It may also comprise, for example, 20 or more layers, 40 or more layers, 60 or more layers, 80 or more layers, 100 or more layers, 150 or more layers, or 200 or more layers. From an optical perspective, a higher number of resin layers is preferable, but too many layers tend to result in an excessively thick overall structure; therefore, it is preferable to have fewer than 2000 layers, and more preferably fewer than 1000 layers. The resins used to form the resin layers of the aforementioned multilayered structure can be well-known resins, such as polyester, polyurethane, polyamide, polyether, polyketone, polyacrylic acid, polycarbonate, polyacetal, polystyrene, polyamide-imide, polyarylate, polyolefin, polyfluoropolymer, polyurethane, polyaryl ester, polyether ester, polyaryl sulfide, polyvinyl chloride, polyether-imide, tetrafluoroethylene, polyetherketone, etc. These resins are not limited to homopolymers and can also be copolymers. These resins can be used alone or in mixtures of two or more. In addition, to easily increase the refractive index difference between resins, it is preferable that at least one of the resin layers is a resin having a condensed aromatic ring, such as a naphthalene ring, as a repeating unit that easily increases the refractive index, and it can also exist as a copolymer component. Among these resins, the resin used in the high-refractive-index resin layer (e.g., the first layer mentioned above) is preferably a crystalline thermoplastic resin, especially one with a melting point of 200°C or higher, as it readily exhibits a high degree of molecular orientation through stretching. From this perspective, a polyester is preferred as a specific thermoplastic resin, and more preferably polyethylene naphthalate or polyethylene terephthalate. This section describes an example of using polyethylene naphthalate as the resin used in the first layer described above. As the aforementioned polyethylene naphthalate, polyethylene naphthalate known in itself can be used. As the aforementioned polyethylene naphthalate, polyethylene 2,6-naphthalic acid ethylene ester is preferred, for example, especially in terms of high refractive index and ability to be stretched at a high elongation ratio, polyethylene 2,6-naphthalic acid ethylene ester having a condensed aromatic ring is preferred. Regarding the ratio of ethylene naphthalate dicarboxylate, a monomeric component in the aforementioned polyethylene naphthalate, based on all repeating units constituting the aforementioned polyethylene naphthalate, it is preferably 95 mol% to 100 mol%, more preferably 96 mol% or more, and even more preferably 97 mol% or more. If the ratio of ethylene naphthalate dicarboxylate, as a major component, does not reach the lower limit, the melting point of the aforementioned polyethylene naphthalate constituting the first layer decreases, making it difficult to obtain a melting point difference relative to the aforementioned polyethylene terephthalate constituting the second layer described later. As a result, it is sometimes difficult to impart a sufficient refractive index difference to the biaxially stretched laminated polyester film. Copolymer components other than the main components of the aforementioned polyethylene naphthalate can include, for example: isophthalic acid, terephthalic acid, phthalic acid, aromatic carboxylic acids such as naphthalenedicarboxylic acid and biphenyl dicarboxylic acid (excluding naphthalenedicarboxylic acid); aliphatic dicarboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, and decanedicarboxylic acid; alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid; and aliphatic diols such as diethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and neopentanediol; alicyclic diols such as 1,4-cyclohexanediol; and diols such as polyethylene glycol and polybutanediol. Of the aforementioned copolymer components, it is preferred to select at least one from the group consisting of isophthalic acid, terephthalic acid, neopentyl glycol, 1,4-cyclohexanediol, and diethylene glycol. Among these copolymer components, isophthalic acid and terephthalic acid are particularly preferred. These copolymer components may be used alone or in combination with two or more components. The aforementioned polyethylene naphthalate can be manufactured using known methods. For example, it can be manufactured by esterifying the diol component, dicarboxylic acid component, and optionally added copolymer components, followed by polycondensation of the resulting reaction product to produce a polyester. Alternatively, it can be manufactured by transesterifying derivatives of these raw material monomers, followed by polycondensation of the resulting reaction product to produce a polyester. Furthermore, it can also be obtained by melt-blending two or more polyesters in an extruder to induce transesterification (redistribution reaction). The intrinsic viscosity of the polyethylene naphthalate constituting the first layer is preferably between 0.40 dl / g and 0.80 dl / g, for example, it can be in the range of 0.45 dl / g to 0.75 dl / g. When the intrinsic viscosity of the polyethylene naphthalate constituting the first layer is not within the above range, the difference in viscosity relative to the intrinsic viscosity of the polyethylene terephthalate constituting the second layer sometimes becomes larger. As a result, when forming an alternating layer structure, the layer structure may be disordered, or although film formation is possible, the film-forming properties may be reduced. When obtaining the film by melt mixing two or more polyesters in an extruder to induce transesterification, the intrinsic viscosity of each polyester should be within the above range. Furthermore, the glass transition temperature of the polyethylene naphthalate constituting the first layer is preferably higher than that of the polyethylene terephthalate constituting the second layer. On the other hand, there are no particular restrictions on the resin used in the low-refractive-index resin layer (e.g., the second layer mentioned above), as long as it exhibits a sufficient refractive index difference relative to the high-refractive-index resin layer and maintains the necessary adhesion. For example, a resin copolymerized from the resin used in the high-refractive-index resin layer and a copolymer component that can lower the refractive index can also be used. Furthermore, without needing to increase the refractive index through stretching, amorphous resins or resins with sufficiently low melting points compared to the resin in the high-refractive-index resin layer can also be used. For example, amorphous polyesters containing polyethylene terephthalate are preferable. Additionally, polylactic acid, acrylic resin, polycarbonate, and polystyrene can also be used as resins in the low-refractive-index resin layer. This section describes an example of using polyethylene terephthalate as the resin used in the second layer described above. When using the aforementioned polyethylene terephthalate (PET), the initial transparency and reflectivity of the film can be improved by selecting appropriate processing conditions during film formation. However, crystallization can sometimes occur due to heating during post-processing, resulting in a decrease in transparency and reflectivity. By using the aforementioned PET with an amorphous polyester as the second layer, the high initial transparency and reflectivity of the film can be maintained even after heating during post-processing. As an example of the aforementioned polyethylene terephthalate, a polyester comprising 50 mol% to 80 mol% of polyethylene terephthalate based on all repeating units constituting the second layer of the aforementioned polyethylene terephthalate can be further preferably described as a copolymerized polyethylene terephthalate with a polyethylene terephthalate content of 55 mol% to 75 mol% (that is, copolymerized with a copolymer content preferably of 20 mol% to 50 mol%, and more preferably 25 mol% to 45 mol%). Within the aforementioned copolymerization amount range, the copolymerization amount can be adjusted according to the type of copolymer used; for example, in the case of copolymerized PET (polyethylene terephthalate) where the copolymer is isophthalic acid or naphthalenedicarboxylic acid, it is approximately 30 mol% or more. When the copolymer content is below the lower limit, crystallization and alignment easily occur during film formation, making it difficult to form a refractive index difference with the first layer, and the near-infrared reflectance performance is easily reduced. In addition, crystallization during film formation will lead to an increase in haze. On the other hand, when the copolymer content exceeds the upper limit, the heat resistance or film-forming properties during film formation (especially during extrusion) are easily reduced. Furthermore, when the copolymer component is a component that imparts a high refractive index, the refractive index difference relative to the first layer is easily reduced due to the increased refractive index. By keeping the copolymer content within the above range, good heat resistance and film-forming properties can be maintained, and the refractive index difference relative to the first layer can be sufficiently ensured, thereby providing sufficient near-infrared reflectance performance. Preferred copolymer components that can be used in the polyethylene terephthalate constituting the second layer include, for example, aromatic dicarboxylic acids such as isophthalic acid, 2,6-naphthalenedicarboxylic acid, and 2,7-naphthalenedicarboxylic acid; aliphatic dicarboxylic acids such as adipic acid, azelaic acid, sebacic acid, and decanedicarboxylic acid; alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid; aliphatic diols such as butanediol and hexanediol; alicyclic diols such as cyclohexanediethanol; and diols such as spirodiol. Among these, isophthalic acid, 2,6-naphthalenedicarboxylic acid, cyclohexanediethanol, and spirodiol are preferred. When other copolymer components are included, the copolymer content of such copolymer components is preferably 10 mol% or less. In particular, from the viewpoint of low refractive index and small molecular weight reduction during extrusion, the copolymer component of the polyethylene terephthalate is preferably 1,4-cyclohexanediethanol. The intrinsic viscosity of the aforementioned polyethylene terephthalate is preferably from 0.4 dl / g to 1.0 dl / g, for example, it can be in the range of 0.45 dl / g to 0.95 dl / g or 0.5 dl / g to 0.95 dl / g. When the intrinsic viscosity of the aforementioned polyethylene terephthalate constituting the second layer is not within the above range, the difference relative to the intrinsic viscosity of the aforementioned polyethylene naphthalate constituting the first layer sometimes becomes large. As a result, when forming an alternating layered structure, the layer composition may be disordered, or although film formation is possible, the film-forming properties may be reduced. When two or more polyesters are melt-mixed in an extruder to undergo transesterification, the intrinsic viscosity of each polyester should be within the range described above. The aforementioned polyethylene terephthalate can be manufactured using known methods. For example, it can be manufactured by esterification of the acid, glycol, and copolymer components of the main components, followed by polycondensation of the resulting reaction product to produce a polyester. Alternatively, it can be manufactured by transesterification of derivatives of these raw material monomers, followed by polycondensation of the resulting reaction product to produce a polyester. Furthermore, it can also be obtained by melt-blending two or more polyesters in an extruder to induce transesterification (redistribution reaction). In addition, the first and second layers may contain small amounts of additives without impairing the purpose of the present invention. Examples of additives include: lubricants such as inert particles, colorants such as pigments or dyes, stabilizers, flame retardants, foaming agents, etc. The aforementioned heat-reflecting layer may have a protective layer on at least one of the outermost layers of the aforementioned multilayered structure. A preferred embodiment is that both outermost layers of the aforementioned multilayered structure have protective heat-reflecting layers. The aforementioned protective layer preferably comprises the resin used in the first layer. The aforementioned protective layer is preferably a layer primarily composed of polyethylene naphthalate. The description in the first layer section above can also be appropriately applied to polyethylene naphthalate and the like. Furthermore, in this invention, the term "based on polyethylene naphthalate" means that the total amount of the above-mentioned protective layer composition contains more than 50% by mass of polyethylene naphthalate, for example, more than 80% by mass or more, or more than 90% by mass. The thickness of the aforementioned protective layer is less than 10 μm, for example, it can be 1 μm to 9 μm, 2 μm to 8 μm, 3 μm to 7 μm, or 4 μm to 5 μm, etc. Furthermore, when the two outermost layers of the aforementioned multilayer laminated structure have protective layers, that is, when multiple protective layers are provided in the laminated film, the thickness of the protective layer represents the thickness of each of these layers. [Surface Functional Layer] The surface functional layer of the present invention is a layer disposed on at least one side of the above-mentioned heat ray reflective layer, and is composed of a resin composition containing particles and resin. The aforementioned particles can be inorganic, organic, or a combination of both. Specifically, particles such as those made from silicon oxide, acrylic resins, styrene resins, acrylic / styrene copolymers, polysiloxane, melamine resins, and benzoguanamine resins can be used. These particles can be used individually or in combination of two or more. The aforementioned particles are preferably organic particles, specifically the organic particles exemplified above, and more preferably acrylic resins, styrene resins, or acrylic / styrene copolymers. From the viewpoint of heat resistance or solvent resistance, acrylic resin particles are particularly preferred. The average particle size of the above-mentioned particles is 4 μm to 10 μm, for example, it can be 4.5 μm to 9.5 μm, 5 μm to 9 μm, 5.5 μm to 8.5 μm, 6 μm to 8 μm, 6.5 μm to 7.5 μm, or 6.7 μm to 7 μm. In this invention, the average particle size of the aforementioned particles is determined by the following method. First, a cross-section of the surface functional layer is cut longitudinally parallel to the microtome. An extremely thin layer of metal, used to impart conductivity to the particle surface, is sputtered onto this cross-section. Images are obtained using a transmission electron microscope (TEM) at magnification of 10,000 to 30,000 times. Based on the magnified images, the diameter of the equal-area circle is calculated using the following formula: Average Particle Size = Sum of the diameters of the equal-area circles of the measured particles / Number of measured particles (at least 100). The content of particles in the surface functional layer is 0.3 to 1.5 parts by mass relative to 100 parts by mass of resin contained in the surface functional layer, for example, 0.4 to 1.4 parts by mass, 0.5 to 1.3 parts by mass, 0.6 to 1.2 parts by mass, 0.7 to 1.1 parts by mass, 0.8 to 1 part by mass, or 0.85 to 9 parts by mass. Furthermore, spherical particles are preferred as the aforementioned particles. The higher the sphericity of the spherical particles, the better; the aspect ratio is preferably 1.3 or less, and especially preferably 1.1 or less. In addition, the particles are preferably colorless and transparent. Here, "colorless and transparent" means that there is no actual reduction in the purity of the three primary colors due to coloring, and excellent light transmittance. Furthermore, the ratio of the thickness of the aforementioned surface functional layer to the average particle size of the particles contained in the surface functional layer is 0.5 or more. By setting the thickness ratio to 0.5 or more, it is possible to suppress particle detachment from the surface functional layer. In addition, there is no particular upper limit to the aforementioned thickness ratio, but from the viewpoint of suppressing material costs, it is preferably 3 or less, more preferably 2.5 or less, and even more preferably 2 or less. Furthermore, when the average particle size of the particles contained in the surface functional layer is greater than the thickness of the surface functional layer (i.e., the above ratio is less than 1), the thickness of the surface functional layer is obtained by measuring the area where no particles are present. The aforementioned resin composition includes resins as adhesive components. Specific examples of the aforementioned resins include: acrylic resins, polyester resins, polyolefin resins, urethane resins, fluoropolymers, etc. These resins can be used alone or in combination of two or more. The aforementioned resin is the main component of the aforementioned resin composition (i.e., contains 50% by mass or more), and is preferably 70% by mass or more, or may contain 90% by mass or more or 95% by mass or more, relative to the total resin composition. The resin described above may suitably contain known ultraviolet absorbers, preferably ultraviolet absorbers having a triazine skeleton. As for the aforementioned ultraviolet absorbers having a triazine skeleton, any known compound may be used as long as it is an ultraviolet absorber having a triazine skeleton within the molecule. Examples of ultraviolet absorbers with a triazine skeleton include: 2-(2-hydroxy-4-hexyloxyphenyl)-4,6-diphenyltriazine, 2-(2-hydroxy-4-propoxy-5-methylphenyl)-4,6-bis(2,4-dimethylphenyl)triazine, 2-(2-hydroxy-4-hexyloxyphenyl)-4,6-diphenyltriazine, 2,4-diphenyl-6-(2-hydroxy-4-methoxyphenyl)triazine, 2,4-diphenyl-6-(2-hydroxy-4-ethoxyphenyl)triazine, and 2,4-diphenyl-6-(2-hydroxy-4-propoxyphenyl)triazine. These compounds include 2,4-diphenyl-6-(2-hydroxy-4-butoxyphenyl)triazine, 2,4-bis(2-hydroxy-4-octoxyphenyl)-6-(2,4-dimethylphenyl)triazine, 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)triazine, 2,4,6-tris(2-hydroxy-4-octoxyphenyl)triazine, 2-(4-isooctoxycarbonylethoxyphenyl)-4,6-diphenyltriazine, and 2-(4,6-diphenyltriazine-2-yl)-5-(2-(2-ethylhexyloxy)ethoxy)phenol. These compounds can be used alone or in mixtures of two or more. The content of the ultraviolet absorber in the weather-resistant resin layer is preferably 8 to 45 parts by weight relative to 100 parts by weight of the resin contained in the surface functional layer, for example, 10 to 40 parts by weight, 12 to 35 parts by weight, 13 to 30 parts by weight, 14 to 25 parts by weight, or 15 to 20 parts by weight. The thickness of the aforementioned surface functional layer can be adjusted according to the application, for example, in the range of 1μm to 125μm, such as 2μm to 100μm, 3μm to 90μm, 5μm to 80μm, or 10μm to 60μm. The aforementioned surface functional layer may contain a small amount of additives without compromising the purpose of the present invention. Examples of additives include: inert particles other than the aforementioned particles, lubricants, leveling agents to improve film quality, colorants such as pigments or dyes, stabilizers, flame retardants, foaming agents, and other additives. [Laminated Film] The laminated film of the present invention is a laminated film having the above-mentioned heat ray reflective layer and a surface functional layer on at least one side of the above-mentioned heat ray reflective layer. In this invention, the term "spectral transmittance" refers to the value measured using a spectrophotometer. The transmittance is measured at 2nm intervals across wavelengths from 300nm to 1800nm, and the transmittance for each wavelength is determined. Furthermore, the average transmittance for each wavelength range (400nm to 800nm ​​and 900nm to 1000nm) is calculated. The measurements are performed in an atmospheric environment at 25°C, with the incident angle of the measured light set to 0 degrees. From the viewpoint of having thermal ray reflection function and obtaining high total light transmittance (and light diffusion), the average transmittance of the laminated film of the present invention is preferably 70% or more, more preferably 75% or more, or even more preferably 80% or more in the wavelength range of 400nm to 800nm, and the average transmittance in the wavelength range of 900nm to 1000nm is preferably 20% or less, more preferably 15% or less, even more preferably 10% or less, and particularly preferably 5% or less. For example, when the laminated film of the present invention is applied to films for greenhouse horticulture, visible light, which serves as the driving force for photosynthesis, can be adequately supplied to the plants. Furthermore, the laminated film of the present invention has high total light transmittance, and is therefore considered to be able to adequately promote plant growth. Furthermore, with an average heat radiation transmittance of less than 20%, for example, when the laminated film of this invention is applied to greenhouse horticulture films, it can effectively block heat radiation that causes temperature rise inside agricultural greenhouses. Moreover, since the heat radiation generated by the film itself, such as the heat radiation absorbing film, is also low, it can suppress the temperature rise inside agricultural greenhouses and reduce the cost of dehumidification and cooling systems. Furthermore, in this invention, the film color b-value is measured using an automatic colorimeter (manufactured by Nippon Denshoku Kogyo Co., Ltd., model Z-300A) according to JIS Z8722. The color measurement after weathering treatment is performed in the same manner. The film color b-value is the difference Δb obtained by subtracting the initial value data from the data after weathering treatment. The preferred b-value for the above-mentioned film color is 5 or less, for example, it can be 4 or less, 3 or less, 2.5 or less, or 2 or less. In addition, in this invention, the static friction coefficient refers to the value measured using the following method. An acrylic plate is placed and fixed on the underside of two films (20cm long and 10cm wide) formed by overlapping the surface of the laminated film of the object with the opposite side of the aforementioned surface. A slider is arranged in the center of the upper side of the two overlapping films and fixed to the acrylic plate. Subsequently, the acrylic sheet is pulled up using a low-speed roller (10 cm / min), and a detector is fixed at one end of the upper membrane (the opposite end of the pulling direction of the lower membrane) to detect the initial tensile force between the membranes. Furthermore, the slider used at this time weighs 200g and has a lower area of ​​50cm². 2 A slider (a rectangle measuring 10cm vertically and 5cm horizontally). Furthermore, the static friction coefficient (μs) is calculated using the following formula: μs = (initial tensile force g) / (load 200g) The static friction coefficient is preferably 0.30 to 0.65, more preferably 0.35 to 0.64, and even more preferably 0.37 to 0.63. [Other Layers] Other known films or layers may be appropriately provided on the above-mentioned laminated film, provided that they do not impede the effectiveness of the present invention. Examples include slip-improving layers and diffusion layers. For example, to further improve the slip properties of the aforementioned laminated film, a slip-imparting layer with the function of imparting slip properties can be appropriately provided. In this case, the slip-imparting layer can be provided on at least one side surface, preferably both surfaces, of the laminated film. The aforementioned slip-imparting layer can be formed by coating a resin layer containing fine particles or lubricants such as wax with an average particle size of 0.05 μm to 0.5 μm onto a multilayer laminated structure, or by co-extrusion lamination. If the average particle size of the aforementioned fine particles is less than 1.0 μm, the film's sliding properties will easily become insufficient with the amount of particles. On the other hand, if it is greater than 10 μm, particles will detach from the coating film, which is therefore undesirable. Examples of such fine particles include: polystyrene, polymethyl methacrylate, methyl methacrylate copolymers, methyl methacrylate cross-linked copolymers, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, benzoguanamine resin, and core-shell particles formed by coating polystyrene particles with acrylic resin; and inorganic particles such as silicon oxide, alumina, titanium dioxide, kaolin, talc, graphite, calcium carbonate, feldspar, molybdenum disulfide, carbon black, and barium sulfate. Among these fine particles, organic particles are preferred. [Applications of the Laminated Film] The laminated film of this invention is preferably used in, for example, the fields of protected horticulture, building materials such as windows, and transportation machinery such as automobiles, airplanes, and trams. Additionally, it is also preferably used, for example, as covers or curtains for outdoor facilities such as agricultural greenhouses, lighting equipment, display devices, vaults, and packaging containers. The laminated film of this invention can be used directly in its film shape, or it can be processed for use. Specific examples of using it directly in its film shape include attaching the laminated film to an object (e.g., window material such as glass). Specific examples of using the laminated film by processing it include using it in the form of woven or knitted fabrics as described below. [Manufacturing Method of Laminated Film] A detailed description of a manufacturing method for a laminated film according to one embodiment of the present invention will be provided. Furthermore, the manufacturing method shown below is an example, and the present invention is not limited thereto. Additionally, different embodiments can be obtained by referring to the following. The laminated film of the present invention has a heat ray reflective layer and a surface functional layer disposed on at least one side of the heat ray reflective layer. Therefore, firstly, the manufacturing method of the heat ray reflective layer will be explained using the case of a multilayer structure formed by alternately stacking at least two resin layers with different refractive indices as an example. One embodiment of the present invention can be obtained by using a multilayer feed block device to alternately overlap polymers constituting the first layer and polymers constituting the second layer in a molten state, for example, to make an alternating layer structure with a total of 99 or more layers, and to provide protective layers on both sides of the aforementioned alternating layer structure. The aforementioned multilayer stacked structure can be stacked in such a way that the thicknesses of the first and second layers have the desired gradient structure. This can be achieved, for example, by changing the spacing or length of the slits in a multilayer feed block device. This allows for the reflection of light with wavelengths from 900 nm to 1000 nm over a wide range. After laminating to the desired number of layers using the above method, the film is extruded from a mold and cooled on a casting drum to obtain a multilayer unstretched film. The multilayer unstretched film is preferably stretched along at least one axial direction (sometimes referred to as the longitudinal, length, or MD direction) in the direction of the film-forming machinery axis, or in a direction orthogonal to the aforementioned directions within the film surface (sometimes referred to as the transverse, width, or TD direction). From the viewpoint of improving mechanical properties, it is more preferable to stretch along both the longitudinal and transverse axes. Preferably, the stretching temperature is within the range of the glass transition point temperature (Tg) °C of the polymer in the first layer to (Tg+20) °C. By stretching at a lower temperature than before, the alignment characteristics of the film can be controlled more precisely. The elongation ratio is preferably 2.0 to 6.5 times in both the longitudinal and transverse directions, and more preferably 3.0 to 5.5 times. Within this range, the higher the elongation ratio, the smaller the difference in refractive index in the planar direction between the layers of the first and second layers due to the thinning effect of the elongation. This results in more uniform light interference in the planar direction of the multilayered structure, and a greater difference in refractive index between the first and second layers in the elongation direction, which is therefore preferable. As an elongation method, any of the following elongation methods can be applied: uniaxial elongation only in the longitudinal or transverse direction, progressive biaxial elongation performing longitudinal and transverse elongation separately, and simultaneous biaxial elongation performing both longitudinal and transverse elongation. For both longitudinal and transverse elongation methods, known elongation methods such as elongation using a rod heater, elongation using a roller heater, and elongation using a tenter frame can be used. From the viewpoint of reducing damage caused by contact with the roller and the elongation speed, elongation using a tenter frame is preferred. In addition, after extension, the inner bundles are relaxed in the extension direction at a temperature of (Tg)℃ to (Tg+30)℃ while being heat-fixed at a temperature of 1% to 15%, thereby enabling high control over the thermal stability (e.g., thermal shrinkage rate) of the obtained multilayer laminated structure. Next, the method for forming the surface functional layer will be explained. The surface functional layer is disposed on at least one side of the heat ray reflective layer, and can be disposed directly on the heat ray reflective layer or disposed through other layers. There are no particular limitations on the formation of the surface functional layer. Examples of methods include coating, spin coating, and transfer printing. However, it is preferable to form it by coating. For example, as a method for forming a surface functional layer by coating the surface of a heat-reflective layer, known coating techniques such as rod coating, roller coating, knife edge coating, gravure coating, and curtain coating can be used. Alternatively, the heat-reflective layer can be surface-treated (flame treatment, corona treatment, plasma treatment, ultraviolet treatment, etc.) before applying the surface functional layer. Furthermore, the coating liquid used for coating is formed by dispersing the aforementioned particles and resin; it can be an aqueous dispersion or a dispersion formed by dispersing with an organic solvent. When a surface functional layer is formed by coating, the coating of the heat ray reflective layer (e.g., a multilayer stacked structure) can be carried out at any stage, but it is preferable to carry it out after the manufacturing process of the multilayer stacked structure. [Fitness Horticulture Film] The facility horticulture film of the present invention includes the above-mentioned laminated film. The above-mentioned horticultural membranes only need to include the above-mentioned laminated membranes, and can be composed solely of the above-mentioned laminated membranes, or can be other known membranes or layers. [Woven or Knitted Fabrics] The woven or knitted fabrics of the present invention comprise fine strips obtained by cutting from a laminated film. The aforementioned woven or knitted fabrics may consist of fine strips cut from the laminated film, or may be composed solely of such fine strips, or may include other known strips or layers. The aforementioned woven or knitted fabrics are, for example, woven or warp-knitted fabrics using the aforementioned thin strips. Alternatively, as another example, the aforementioned woven or knitted fabrics are warp-knitted fabrics using the aforementioned thin strips as interlayer yarns. In addition, the aforementioned woven or knitted fabrics are, for example, fabrics that use the aforementioned thin strips as warp or weft yarns, or filament yarns as weft or warp yarns. Compared to cases where the film is used as a standalone unit, such as a heat-reflecting layer, the aforementioned woven or knitted fabrics can provide the laminated film with better mechanical strength, such as rollability, adhesion resistance, tear resistance, and durability. Furthermore, the aforementioned woven or knitted fabrics can ensure air permeability through openings formed between thin strips, filament yarns, etc. Thus, compared to using laminated films directly as individual units, the aforementioned woven or knitted fabrics generally have superior air permeability. Therefore, at night, especially in the early morning, when the temperature difference between the cultivation section and the canopy section increases, it can prevent condensation from forming on the lower surface of the film and dripping onto the plants, causing discoloration and deterioration of the plants' fruits, leaves, and flowers. Furthermore, the openings formed in the woven or knitted fabrics prevent excessive blocking of ultraviolet rays. Preventing excessive ultraviolet blocking can sometimes be effective for, for example, improving the coloration of fruits such as eggplants and aiding in the normal pollination activities of bees in agricultural greenhouses. Furthermore, in the aforementioned woven or knitted fabrics, the thickness of the filament yarn, etc., can be set to 0.01 to 0.30 times the width of the thin strip, and the spacing between adjacent thin strips can be set to 0.1 to 0.5 times the width of the thin strip. In addition, in this invention, "filament yarn, etc." refers to filament yarn or spinning. The aforementioned filament yarn can be either monofilament yarn or multifilament yarn, without particular limitation. Furthermore, as shown in Figures 1 and 2, a fabric obtained by weaving thin strips (warp yarns) 11 using filament yarns (weft yarns) 12 can be illustrated. These thin strips (warp yarns) 11 are obtained by cutting (slitting) the laminated film into thin strips. By setting the thickness A of the filament yarns (weft yarns) 12, the width B of the thin strips (warp yarns) 11, the spacing C between adjacent filament yarns (weft yarns) 12, and the spacing D between adjacent thin strips (warp yarns) 11 to specific ranges, the porosity of the woven or knitted fabric becomes appropriate. Compared to using the laminated film directly as a single unit, this ensures comparable high light transmittance and heat ray reflectivity, and also makes the ultraviolet transmittance appropriate. Additionally, for secure weaving, filament yarns (warp yarns) 13 of thickness E are interposed as warp yarns between adjacent thin strips (warp yarns) 11. More specifically, in the aforementioned woven or knitted fabrics, by setting the thickness of the filament yarns (weft yarns) 12 to 0.01 to 0.30 times the width of the ribbon-like strips (warp yarns) 11, and setting the spacing between adjacent ribbon-like strips (warp yarns) 11 to 0.1 to 0.5 times the width of the ribbon-like strips (warp yarns) 11, the aperture ratio is made within an appropriate range. Compared to using the laminated film directly as a single unit, this ensures comparable high light transmittance and heat ray reflectivity, and also makes the ultraviolet transmittance within an appropriate range. Furthermore, the spacing between adjacent filament yarns (weft yarns) 12 is preferably in the range of 1.0 mm to 10 mm. The width of the fine strips (warp yarns) 11 is preferably 1 mm to 10 mm, more preferably 2 mm to 6 mm, and even more preferably 3 mm to 5 mm. The spacing between the fine strips (warp yarns) 11, that is, the distance between the ends of adjacent fine strips (warp yarns) 11, is preferably 0.2 mm to 1.0 mm, more preferably 0.4 mm to 0.8 mm, and even more preferably 0.5 mm to 0.7 mm. The thickness of the filament yarns, etc. (weft yarns) 12 is preferably 0.05 mm to 0.35 mm, more preferably 0.1 mm to 0.3 mm, and even more preferably 0.15 mm to 0.25 mm. The woven or knitted fabric of the present invention, by setting the width of the fine strips, the thickness of the filament yarns, the spacing of adjacent filament yarns, and the spacing of adjacent fine strips as described above, makes the porosity within an appropriate range. Compared with the case of using the laminated film directly as a single unit, it can ensure a high total light transmittance and heat ray reflectance that are not inferior, and makes the ultraviolet transmittance within an appropriate range. The porosity of the woven or knitted fabric formed by the laminated film is preferably set to 10% to 30%. Furthermore, regarding the "porosity" in this invention, it refers to a square portion (area 100 cm²) of 10 cm² in both the longitudinal and transverse directions on one surface of the woven or knitted fabric, perpendicular to the surface. 2 When observing the surface, the portion of the inner surface that can be observed without obstruction is defined as an opening. The sum of the areas of these openings (called the opening area) is calculated (Scm). 2 ), by formula: [S(cm 2 ) / 100(cm 2 )]×100 to find the answer. In the woven or knitted fabrics of this invention, if the porosity is 10% or higher, the fabric or knitted fabric can have good air permeability. When the skylights in the roof are opened at night when photosynthesis is not occurring, allowing the temperature inside the agricultural greenhouse to drop in preparation for the daytime temperature rise the following day, the air heated during the day in the lower part of the greenhouse can escape to the outside through the woven or knitted fabric. Furthermore, at night, especially in the early morning, when the air near the roof cools, it can prevent condensation on the lower surface of the woven or knitted fabric from forming water droplets that drip onto the plants, causing discoloration, deterioration, or other quality reduction in the fruits, leaves, and flowers, or deterioration of the woven or knitted fabric itself; therefore, this is preferable. Additionally, if the porosity is 30% or lower, it can ensure high light transmittance and heat ray reflectivity due to the laminated film; therefore, this is preferable. [Example] Secondly, the present invention is specifically illustrated by means of embodiments, but the invention is not limited to the following embodiments. Furthermore, the physical properties and characteristics in the embodiments were measured or evaluated using the methods described below. Additionally, "parts" refers to "parts by mass". In addition, the various measurements and evaluations in the embodiments are performed in the following manner. (1) Overall membrane thickness and thickness of each layer The overall membrane thickness is determined by clamping the membrane sample on a rotating shaft detector (manufactured by Anritsu Electric Co., Ltd., K107C) and using a digital differential electronic micrometer (manufactured by Anritsu Electric Co., Ltd., K351) to measure the thickness at 10 different locations, and then calculating the average value as the overall membrane thickness. The thickness of each membrane layer was determined by cutting the laminated membrane into sections 2 mm long and 2 cm wide, fixing them into embedding capsules, and then embedding them using epoxy resin (manufactured by Refinetec Co., Ltd., Epomount). The embedded sample was then vertically cut along its width using a microtome (manufactured by LEICA, ULTRACUT UCT) to produce 5 nm thick thin film sections. These sections were observed and photographed using a transmission electron microscope (Hitachi S-4300) at an accelerating voltage of 100 kV, and the thickness (physical thickness) of each layer was determined based on the photographs. For layers with a thickness exceeding 1 μm, the layers existing inside the multilayer structure are designated as the intermediate layers, and the layers existing on the outermost surface are designated as the outermost layers, and the thickness of each is measured. Furthermore, the first or second layer can be determined by the refractive index state. However, in cases where determination is difficult, it can also be determined by analyzing the electronic state using NMR (Nuclear Magnetic Resonance) or TEM. In addition, the refractive index of each layer can also be determined from a monolayer film with the same composition but a thicker thickness. (2) Spectroscopic transmittance: Spectroscopic transmittance was measured using a spectrophotometer (Shimadzu Corporation, UV3600) at 2 nm intervals from wavelength 300 nm to 1800 nm. The spectroscopic spectrum of the obtained laminated film was obtained, and the spectral transmittance at each wavelength was measured. Furthermore, the average transmittance for each wavelength range (wavelength 400 nm to 800 nm and wavelength 900 nm to 1000 nm) was calculated. In addition, the measurements were conducted at 25°C in an atmospheric environment, and the incident angle of the measured light was set to 0 degrees. (3) Total light transmittance Total light transmittance (TT) was measured using a fog meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., NDH-4000) according to JIS K7361-1. The determination of the total light transmittance after weathering treatment was also carried out and measured in the same manner. (4) Average particle size The average particle size of the particles (also known as "fillers") contained in the surface functional layer is determined by the following method. First, a cross-section of the surface functional layer was cut longitudinally parallel to the surface using a slicing machine. An extremely thin layer of metal to impart conductivity to the particle surface was sputtered onto this cross-section. Images were obtained using a transmission electron microscope (TEM) at magnification of 10,000 to 30,000 times. Based on the obtained images, the diameter of the equal-area circle was calculated using the following formula. The results are shown in Table 1. Formula: Average particle size = Sum of the diameters of the equal-area circles of the measured particles / Number of measured particles (at least 100). (5) Evaluation of film color b-value The film color b-value was measured using an automatic colorimeter (manufactured by Nippon Denshoku Kogyo Co., Ltd., model Z-300A) according to JIS Z8722. The color after weathering test treatment was also measured in the same way. The film color b-value is defined as Δb, which is the difference between the value after weathering test treatment and the initial value before treatment, and is shown in Table 1. (6) Moisture heat treatment: The film was cut into 50 mm squares to obtain sample pieces, which were placed in an environmental testing machine set at 80°C and 80% humidity for 120 hours. Then, the sample pieces were removed for appearance evaluation and adhesion evaluation, as shown in Table 1. In addition, the tests using the samples after moisture heat treatment were set as the various determinations after the weathering test. (7) The adhesion evaluation after moisture heat treatment was carried out in the following manner: A checkerboard pattern was cut with a cross (1mm) at the bottom. 2 (100 squares) A ​​24mm wide transparent tape (manufactured by Nichiban) was applied to the aforementioned checkerboard pattern. After quickly peeling it off at a 90° angle, the peeled surface was observed, and the adhesion was evaluated according to the following criteria. [Adhesion Evaluation Criteria] (8) The static friction coefficient of the laminated film is formed by overlapping the surface of the laminated film with the opposite side of the aforementioned surface to form two films (20cm in length and 10cm in width respectively), and a fixed acrylic plate is placed on the lower side. A slider is arranged in the center of the upper side of the two overlapping films and fixed to the acrylic plate. Subsequently, the acrylic sheet is pulled up using a low-speed roller (10 cm / min), and a detector is fixed at one end of the upper membrane (the opposite end of the pulling direction of the lower membrane) to detect the initial tensile force between the membranes. Furthermore, the slider used at this time weighs 200g and has a lower area of ​​50cm². 2 A slider (a rectangle measuring 10cm vertically and 5cm horizontally). Furthermore, the static friction coefficient (μs) is calculated using the following formula: μs = (initial tensile force g) / (load 200g). If the static friction coefficient of the membrane increases, its sliding properties decrease, making it prone to wrinkles or defects when the membrane is wound into a roll or during processing. [Preparation of Heat Reflective Layer A] As the polyester used for the first layer and the protective layer, polyethylene 2,6-naphthalenedicarboxylate (hereinafter referred to as "PEN") with an intrinsic viscosity (o-chlorophenol, 35°C) of 0.62 dl / g is prepared. As the polyester used for the second layer, polyethylene terephthalate (hereinafter referred to as "PETG") copolymerized with cyclohexanediethanol at 30 mol% has an intrinsic viscosity (o-chlorophenol, 35°C) of 0.77 dl / g. The polyester used for the first layer and the protective layer is dried at 180°C for 5 hours and then fed to the extruder. The PEN of the first layer becomes molten at 290°C. The PETG of the second layer is dried at 120°C for 10 hours and then fed to the extruder, where it is heated to 230°C to become molten. Then, the first layer of PEN is divided into 137 layers, and the second layer of PETG is divided into 138 layers. A multilayer feed block device is used for lamination. This device forms the laminated structure and a protective layer on both sides of the laminated structure. The laminated structure alternates between the first layer of PEN and the second layer of PETG, with the ratio of the maximum to the minimum layer thickness of each of the first and second layers continuously varying to 1.4 times (maximum / minimum). Maintaining this lamination state, the film is fed into a mold and cast onto a casting roller. The outermost layer on both sides of the film has a protective layer composed of PEN layers, resulting in an unextended multilayer laminated film with a total of 275 layers in the laminated structure. Furthermore, the thickness of the protective layer is adjusted in the manner described in Table 1 to achieve the extended thickness. In addition, the amount of resin ejected from the first and second layers is adjusted so that the optical thickness ratio of the first and second layers of the laminated structure (excluding the protective layer) is equal. The unstretched film obtained in the above manner is preheated at 120°C, and then heated from 15 mm above using an IR (Infrared Radiation) heater at 900°C between low-speed and high-speed rollers, and stretched 3.5 times longitudinally. It is then fed to a tenter frame and stretched 4.5 times transversely at 140°C. The resulting biaxially aligned film is heat-fixed at 190°C for 30 seconds, and then subjected to 1.5% inward relaxation (inner tension) transversely. The thickness of the heat-reflective layer is 55 μm, with the total thickness of the protective layers on both sides being 13 μm, resulting in a roller with a width of 2000 mm. [Preparation of Coating Solution A and Formation of Weather-Resistant Resin Layer] A special acrylic resin (manufactured by Nippon Shokubai Co., Ltd., "UV-G13"), a triazine-based ultraviolet absorber (manufactured by ADEKA Co., Ltd., "Adekastab (registered trademark) LA-F70", molecular weight 700), polymer particles with an average particle size of 5.2 μm (manufactured by Sekisui Chemicals Co., Ltd., "Techpolymer (registered trademark) MBX-5"), and a solvent (toluene) were mixed in the mass ratios shown in Table 1 to obtain a coating solution. The obtained coating solution was applied to the surface of the heat-reflective polyester film using a rod coater and dried to form a coating layer of the predetermined thickness shown in Table 1. [Preparation of Coating Solution B] Instead of polymer particles with an average particle size of 5.2 μm, polymer particles with an average particle size of 7.3 μm (manufactured by Sekisui Chemicals Co., Ltd., "Techpolymer (registered trademark) MBX-8") were used. Otherwise, the same procedure as for coating solution A was followed to obtain coating solution B. The obtained coating solution was coated onto the surface of the heat-reflective polyester film using a rod coater and dried to form a coating layer of the predetermined thickness shown in Table 1. [Preparation of Coating Solution C] Instead of polymer particles with an average particle size of 5.2 μm, polymer particles with an average particle size of 4.0 μm (manufactured by Nippon Shokubai Co., Ltd., "Epostar (registered trademark) MV1004") were used. Otherwise, the same procedure as for coating solution A was followed to obtain coating solution C. The obtained coating solution was applied to the surface of the heat-reflective polyester film using a bar coater and dried to form a coating layer of the predetermined thickness shown in Table 1. [Preparation of Coating Solution D] Coating solution D was prepared in the same manner as coating solution A, except that the polymer particles with an average particle size of 5.2 μm and the ultraviolet absorber contained in coating solution A were not added. The obtained coating solution was then coated onto the surface of the heat-reflective polyester film using a rod coater and dried to form a weather-resistant layer of the predetermined thickness shown in Table 1. [Preparation of Coating Solution E] Instead of polymer particles with an average particle size of 5.2 μm, polymer particles with an average particle size of 12.1 μm (manufactured by Sekisui Chemicals Co., Ltd., "Techpolymer MBX-12" (registered trademark)) and a triazine-based ultraviolet absorber (manufactured by BASF, "Tinuvin 326" (registered trademark), molecular weight 316) were used. All other things being equal, coating solution E was prepared in the same manner as coating solution A to obtain coating solution E. The obtained coating solution was applied to the surface of the heat-reflective polyester film using a rod coater and dried to form a weather-resistant layer of the predetermined thickness shown in Table 1. [Example 1-1] Coating solution A was applied to a heat-reflective layer A (55 μm thick) using a rod coater. The resulting sample was placed in an oven and dried at 120°C for 1 minute to cure the coating layer and obtain a laminated film. The thickness of the obtained laminated film was 69 μm (heat-reflective layer A: 55 μm, surface functional layer: 14 μm). The obtained laminated film was evaluated using the method described above. The evaluation results are shown in Table 1. [Examples 1-2 to Examples 1-4, Comparative Examples 1-1 to Comparative Examples 1-2] Each component of the coating solution A was prepared in the manner shown in Table 1. Otherwise, a laminated film was prepared in the same manner as in Example 1-1, and the same evaluation was performed as in Example 1-1. [Examples 2-1 to Examples 2-3, Comparative Examples 2-1 to Comparative Examples 2-2] Each component of the coating solution B was prepared in the manner shown in Table 1. Otherwise, a laminated film was prepared in the same manner as in Example 1-1, and the same evaluation was performed as in Example 1-1. [Examples 3-1 to 3-4, Comparative Examples 3-1 to 3-3] The components of the coating solution C were prepared in the manner shown in Table 1. Otherwise, the laminated film was prepared in the same manner as in Example 1-1, and the same evaluation was performed as in Example 1-1. [Comparative Example 4-1] No coating layer was applied in such a way as shown in Table 1. Otherwise, a laminated film was prepared in the same manner as in Example 1-1, and the same evaluation was performed as in Example 1-1. [Comparative Example 4-2] The components of the coating solution D were prepared in the manner shown in Table 1. Otherwise, the laminated film was prepared in the same manner as in Example 1-1, and the same evaluation was performed as in Example 1-1. [Comparative Examples 4-3] The components of the coating solution E were prepared in the manner shown in Table 1. Otherwise, the laminated film was prepared in the same manner as in Example 1-1, and the same evaluation was performed as in Example 1-1. The above formula and results are shown in Table 1 below. [Table 1] As shown in Table 1, the laminated film of the embodiments of the present invention has superior durability and adhesion compared with the laminated film of the comparative examples, and can maintain high light transmittance. 11: Fine ribbon-like strips (warp yarns) 12: Filament yarns, etc. (weft yarns) 13: Filament yarns, etc. (warp yarns) A, E: Thickness B: Width C, D: Spacing [Figure 1] is a partial front view showing one embodiment of the laminated film of the present invention. [Figure 2] is a partial front view showing another embodiment of the laminated film of the present invention.

Claims

1. A laminated film having a heat-reflecting layer and a surface functional layer on at least one side of the heat-reflecting layer; the surface functional layer is formed of a resin composition comprising particles, a resin as an adhesive component, and a UV absorber, wherein the average particle size of the particles is 4 μm to 10 μm, the particles are selected from silicon oxide particles, organic particles, and organic-inorganic composite particles, and the particles comprise 0.3 to 0.9 parts by mass relative to 100 parts by mass of the resin, and the UV absorber comprises 8 to 45 parts by mass relative to 100 parts by mass of the resin.

2. The laminated film as described in claim 1, wherein the aforementioned ultraviolet absorber has a triazine backbone.

3. The laminated film as described in claim 1, wherein the aforementioned heat-reflecting layer comprises a multilayer laminated film, wherein the aforementioned multilayer laminated film is formed by alternately laminating at least 20 or more layers of at least two resin layers with different refractive indices in the thickness direction.

4. The laminated film as described in claim 1, wherein the resin used as an adhesive component comprises acrylic resin.

5. The stacked film as described in claim 1, wherein the average transmittance of the stacked film is 70% or more at wavelengths from 400 nm to 800 nm and the average transmittance is 20% or less at wavelengths from 900 nm to 1000 nm.

6. A membrane for greenhouse horticulture, comprising a laminated membrane as described in any one of claims 1 to 5.

7. A woven or knitted fabric comprising thin strips, wherein the thin strips are obtained by cutting the laminated film described in any one of claims 1 to 5.

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