Film sheet

Abstract

A film sheet (2) according to the present invention contains a thermoplastic resin other than an acrylic polymer and a plurality of inorganic particles. The thermoplastic resin has a fibrous portion (7) and a non-fibrous portion (8). Among the plurality of inorganic particles, exposed inorganic particles having a portion exposed from the thermoplastic resin are present at the peripheral edges of a plurality of voids (5) in which the thermoplastic resin is not present. The inorganic particles have a function, and in an observation field of view in which the surface of the film sheet (2) is observed at a magnification of 5,000× by a scanning electron microscope, the resin occupancy ratio, which is the ratio of the total area of the thermoplastic resin to the area of the observation field of view, can be more than 0% and 80% or less.

Description

film sheet 【0001】 This invention relates to a porous film sheet containing inorganic particles. 【0002】 Patent Document 1 describes a film that is waterproof and breathable and useful as a material for clothing, comprising a porous polyethylene membrane with a porosity of 60% or more and a hydrophilic polymer filling at least a portion of the pores of the porous polyethylene membrane, wherein the water vapor transmission rate is within a specific range. The porosity is described in

[0074] of Patent Document 1. Patent Document 1 also states that inorganic pigments or dyes may be used for the purpose of coloring the porous polyethylene and / or the hydrophilic polymer. 【0003】 International Publication No. 2020 / 028328 【0004】 The present invention relates to a film sheet containing a thermoplastic resin other than an acrylic polymer and a plurality of inorganic particles. In one embodiment of the film sheet of the present invention, it is preferable that the thermoplastic resin has a fibrous portion and a non-fibrous portion. In one embodiment of the film sheet of the present invention, it is preferable that exposed inorganic particles, among the plurality of inorganic particles, which have a portion exposed from the thermoplastic resin, are present at the periphery of a plurality of voids where the thermoplastic resin is absent. 【0005】 The present invention also relates to a wearable article including a film sheet. In one embodiment of the wearable article of the present invention, the film sheet preferably includes a thermoplastic resin and a plurality of inorganic particles. In one embodiment of the wearable article of the present invention, it is preferable that a plurality of voids in the film sheet, where the thermoplastic resin is absent, extend through the thermoplastic resin. In one embodiment of the wearable article of the present invention, it is preferable that exposed inorganic particles, among the plurality of inorganic particles, which have portions exposed from the thermoplastic resin, are present at the periphery of the plurality of voids. In one embodiment of the wearable article of the present invention, it is preferable that the wearable article is selected from the group consisting of clothing, shoes, hats, and articles used to absorb bodily fluids discharged from the human body. 【0006】 The present invention also relates to a method for manufacturing a film sheet, wherein the method contains a thermoplastic resin other than an acrylic polymer and a plurality of inorganic particles, the thermoplastic resin having a fibrous portion and a non-fibrous portion, and exposed inorganic particles, among the plurality of inorganic particles, having a portion exposed from the thermoplastic resin, are present at the periphery of a plurality of voids where the thermoplastic resin is absent. In one embodiment of the method for manufacturing a film sheet according to the present invention, it is preferable to have a step of performing a first stretch in one direction (stretching step) on an unstretched sheet containing a thermoplastic resin other than an acrylic polymer and a plurality of inorganic particles. In one embodiment of the method for manufacturing a film sheet according to the present invention, it is preferable to have a step of performing a second stretch in a direction intersecting the first direction after performing the stretching step. 【0007】 Figure 1 is a substitute photograph for a drawing, corresponding to a 5000x observation field of view of the surface of one embodiment of the film sheet of the present invention. Figure 2 is a substitute photograph for a drawing, corresponding to a 5000x observation field of view of the surface of another embodiment of the film sheet of the present invention (film sheet of Example 1). Figure 3 is a substitute photograph for a drawing, corresponding to a 5000x observation field of view of the surface of yet another embodiment of the film sheet of the present invention. Figure 4 is a schematic plan view of a 5000x observation field of view of the surface of one embodiment of the film sheet of the present invention. Figure 5 is a substitute photograph for a drawing, taken by SEM of a cross-section along the thickness direction of the film sheet shown in Figure 2. Figure 6 is an explanatory diagram of a method for measuring the degree of orientation of the fibrous portion in the film sheet. Figure 7 is a substitute photograph for a drawing, corresponding to a 5000x observation field of view of the surface of the film sheet of Example 2. Figure 8 is a substitute photograph for a drawing, corresponding to a 5000x observation field of view of the surface of the film sheet of Example 3. Figure 9 is a substitute photograph for a drawing, corresponding to a 5000x observation field of view of the surface of the film sheet of Example 4. Figure 10 is a photograph used as a substitute for a drawing, corresponding to the 5000x observation field of view of the surface of the film sheet of Example 18. Detailed description of the invention 【0008】Porous film sheets containing inorganic particles can become functional film sheets with specific functions by using inorganic particles that have specific functions (e.g., deodorizing function). Combined with the high breathability resulting from the porous structure, this opens up possibilities for various applications. 【0009】 The aforementioned film sheets are typically required to have high water pressure resistance in addition to high breathability. Film sheets with low water pressure resistance may lose their waterproof properties over time, potentially rendering them unsuitable for practical use. 【0010】 The present invention relates to providing a film sheet with high water pressure resistance and excellent waterproofing properties. The features, effects, and embodiments of the present invention are described below. 【0011】 The film sheet of the present invention contains a thermoplastic resin and a plurality of inorganic particles. The thermoplastic resin constitutes the main body of the film sheet of the present invention. Preferably, the thermoplastic resin forms a network structure including fibrous portions and / or non-fibrous portions, as described later, and forms the basic structure of the film sheet. The inorganic particles are used to form voids in the film sheet of the present invention, as described later, and may also be used to impart specific functions to the film sheet. 【0012】 Figures 1 to 3 show the observation field (hereinafter also referred to as the "5000x observation field") obtained by magnifying the surface of one embodiment of the film sheet of the present invention (film sheets 1 to 3) 5000 times with a scanning electron microscope (SEM). Here, "the surface of the film sheet" refers to one of a pair of opposing surfaces (main surfaces) located at both ends in the thickness direction of the film sheet. Unless otherwise specified, the "surface of the film sheet" includes both surfaces of the pair of surfaces of the film sheet. 【0013】In the film sheet of the present invention, it is preferable that the thermoplastic resin extends around and encloses a plurality of voids where the thermoplastic resin is not present. In such a preferred form of film sheet, the voids are scattered, making it porous and breathable. Typically, in the film sheet of the present invention, a plurality of the voids formed by being enclosed by the thermoplastic resin exist on the surface and inside the film sheet. Furthermore, it is preferable that at least a portion of these multiple voids communicate with each other by overlapping in the thickness direction of the film sheet (in the illustrated example, the direction perpendicular to the plane of the paper), forming a void with a larger volume. Typically, the voids are not closed, that is, they are not completely enclosed by the thermoplastic resin. It is preferable that the voids consist of voids between a plurality of adjacent fibrous portions. Specific examples of this are shown in Figures 1 to 3. 【0014】 Preferably, the inorganic particles contained in the film sheet include inorganic particles having portions exposed from the thermoplastic resin (hereinafter also referred to as "exposed inorganic particles"). The inorganic particles contained in the film sheet may also include inorganic particles whose entire surface is covered with thermoplastic resin and have no exposed portions (hereinafter also referred to as "non-exposed inorganic particles"). In the 5000x observation field of view in Figures 1 to 3, the white dots are inorganic particles. Among the multiple white dots in the 5000x observation field of view, those that are relatively darker in white are exposed inorganic particles, and those that are relatively lighter in white are non-exposed inorganic particles. 【0015】Whether inorganic particles contained in a film sheet are exposed inorganic particles can be determined by performing elemental analysis of the inorganic particles. Typically, if the elemental analysis reveals that the inorganic particles contain metal, or substantially no thermoplastic resin (carbon), then the inorganic particles are determined to be exposed inorganic particles. Furthermore, if the elemental analysis reveals that the inorganic particles substantially contain no metal, or substantially only thermoplastic resin (carbon), then the inorganic particles are determined to have no portion exposed from the thermoplastic resin. The elemental analysis can be performed using known analytical means in accordance with conventional methods. An example of such analytical means is a scanning electron microscope (SEM) with an energy-dispersive X-ray spectrometer (EDS). 【0016】 It is preferable that exposed inorganic particles are present at the periphery of the void portion 5. The "periphery of the void portion 5" refers to the area within 1 μm outside the void portion 5 from the periphery (outline of the void portion 5) in a 5000x observation field. In the 5000x observation field of the surface of one embodiment of the film sheet of the present invention shown in Figure 4, the portion indicated by reference numeral 5S is the periphery of the void portion 5. Note that Figure 4 schematically shows only the outermost surface of the film sheet for ease of explanation and differs from an actual film sheet. 【0017】Porous film sheets containing a thermoplastic resin and multiple inorganic particles are typically manufactured by stretching an unstretched sheet containing the thermoplastic resin and multiple inorganic particles. This stretching process causes interfacial delamination between the thermoplastic resin and the inorganic particles. As a result, multiple voids are formed on the surface and inside the thermoplastic resin where the thermoplastic resin is absent. Consequently, the thermoplastic resin becomes porous. Conventional porous film sheets manufactured in this way, i.e., film sheets having multiple voids, generally have low water pressure resistance, and there was room for improvement in waterproofing. As a result of various studies to solve this problem, the inventors of the present invention found that porous film sheets in which exposed inorganic particles exist at the periphery of the voids have higher water pressure resistance and superior waterproofing compared to those in which exposed inorganic particles do not exist at the periphery of the voids. The film sheet of the present invention is based on this finding. 【0018】The reason why the water pressure resistance of the film sheet is higher when exposed inorganic particles are present at the periphery of the voids compared to when they are absent is unclear. However, it is presumed that the former tends to result in a smaller span of the voids. In other words, to improve the water pressure resistance (waterproofing) of the porous film sheet, it is effective to reduce the span of the multiple holes, i.e., voids, that the film sheet has (Reference: Masaru Haruta, "Nano-functional controlled membrane waterproof and breathable material 'Entrant'", Journal of the Textile Machinery Society of Japan, Vol. 59, No. 3, 2006, pp. 173-176, pp. 27-30). Furthermore, the voids with exposed inorganic particles at the periphery are formed in the stretching process by interfacial isolation of the thermoplastic resin near the surface of the exposed inorganic particles. Compared to those formed by interfacial isolation of the thermoplastic resin near the surface of non-exposed inorganic particles, these tend to have a smaller span and a larger number of voids. On the other hand, among the porous film sheets, those without exposed inorganic particles at the periphery of the voids are less likely to form voids during the stretching process. This is thought to be because the interface is such that interfacial delamination between the particles and the resin is less likely to occur. Furthermore, even if voids are formed, their span tends to be large, which tends to reduce water pressure resistance. To facilitate interfacial delamination between the particles and the resin, it is possible to adjust one or more of the following: particle size, hydrocarbon oil content, resin type, stretching temperature, stretching speed, etc. 【0019】Furthermore, as mentioned above, one of the purposes of using inorganic particles in the present invention is to impart specific functions of the inorganic particles to the film sheet. Exposed inorganic particles exhibit their functions more easily than non-exposed inorganic particles. The presence of exposed inorganic particles at the periphery of the void 5 makes it easier to achieve the above purpose. For example, consider the case of inorganic particles having a deodorizing function. The void 5 functions as a flow path for gas flowing inside and outside the film sheet. Deodorizing inorganic particles are arranged as exposed inorganic particles at the periphery of the void 5, that is, in a form that has an exposed portion that is not covered with thermoplastic resin. In this case, the frequency of contact between the gas flowing through the void 5 and the inorganic particles is relatively high. Therefore, odor components contained in the gas are treated by the inorganic particles, making it easier to obtain a predetermined deodorizing effect. 【0020】 From the viewpoint of ensuring that the effect of having exposed inorganic particles at the periphery of the void portion 5 is more reliably achieved, the film sheet of the present invention has portions where, in a 5000x observation field of view on one surface of the film sheet, the ratio of the total area of ​​exposed inorganic particles at the periphery of the void portion 5 to the area of ​​the observation field (hereinafter also referred to as the "periphery exposed inorganic particle occupancy rate") is preferably greater than 0%, and more preferably 0.1% or more. Furthermore, from the viewpoint of improving the uniform dispersion of inorganic particles in the film sheet and scattering the void portion 5 throughout the entire film sheet, the periphery exposed inorganic particle occupancy rate is preferably 30% or less, and more preferably 10% or less. The periphery exposed inorganic particle occupancy rate is measured by the following method. 【0021】 <Method for Measuring Peripheral Exposed Inorganic Particle Occupancy> First, one surface of the film sheet to be measured is magnified 5000 times using a SEM and imaged to obtain an observation image corresponding to the observation field. Next, the portion where exposed inorganic particles exist at the periphery of the void is extracted from the observation image, and the total area B1 of the extracted portion is calculated. Specifically, the total area S1 is calculated using the image processing software ImageJ. Then, the peripheral exposed inorganic particle occupancy is calculated using the following formula. In the following formula, "B0" refers to the area of ​​the observation field. Peripheral exposed inorganic particle occupancy (%) = (B1 / B0) × 100 【0022】 Exposed inorganic particles can be present at the periphery of the void portion 5, for example, by employing a manufacturing method for a film sheet that includes a step of stretching an unstretched sheet containing inorganic particles. This stretching step causes delamination at the interface between the thermoplastic resin and the inorganic particles, forming the void portion 5. At the same time, the inorganic particles at the periphery of the void portion 5 come to exist in a form in which there are portions that are exposed and not covered by the thermoplastic resin. 【0023】 In the present invention, it is preferable that the resin occupancy rate, which is the ratio of the total area of ​​the thermoplastic resin to the area of ​​the 5000x observation field, is within a predetermined range. The resin occupancy rate is measured by the following method. 【0024】 <Method for Measuring Resin Occupancy> First, one surface of the film sheet to be measured is magnified 5000 times using a SEM and imaged to obtain an observation image corresponding to the observation field. Next, the portion where thermoplastic resin is present is extracted from the observation image, and the total area A1 of the extracted portion is calculated. Specifically, the total area A1 is calculated using the image processing software ImageJ. Then, the resin occupancy of the film sheet to be measured is calculated using the following formula. In the following formula, "A0" refers to the area of ​​the observation field. Resin occupancy (%) = (A1 / A0) × 100 【0025】 For example, when measuring the resin content of a film sheet of a suspected infringing product, if the film sheet is bonded to another article (e.g., nonwoven fabric) by adhesive or fusion to form a composite, it is advisable to reduce the bonding force by blowing cold air from a cold spray onto the joint, and then remove only the film sheet from the composite. This method of removing the film sheet from the composite can also be used when measuring other physical properties besides resin content. 【0026】From the viewpoint of providing the film sheet with high breathability, the resin occupancy rate is preferably 80% or less, more preferably 70% or less, and even more preferably 60% or less. The value calculated by subtracting the resin occupancy rate from 100 can be considered as the ratio of the total area of ​​the voids (areas where thermoplastic resin is not present) to the area of ​​the 5000x observation field of view of the surface of the film sheet (hereinafter also referred to as the "void occupancy rate"). A resin occupancy rate of 80% or less is preferable, which means that a void occupancy rate of 20% or more is preferable. Generally, the smaller the resin occupancy rate (the larger the void occupancy rate), the better the breathability and moisture permeability of the film sheet. A film sheet with high breathability and moisture permeability has the property of not allowing liquids such as water to pass through the film sheet, but allowing water vapor to pass through. Therefore, it is useful as a sheet for clothing, for example. Also, generally, the smaller the resin occupancy rate, the larger the surface area of ​​the interface between the thermoplastic resin and the outside air, making it easier to reflect light. This can improve the heat shielding properties of the film sheet. Furthermore, generally, the lower the resin occupancy rate, the more exposed inorganic particles tend to be, making it easier for the functions of the inorganic particles (e.g., deodorizing function) to manifest. From the viewpoint of providing the film sheet with practically sufficient strength (water pressure resistance, etc.), the resin occupancy rate is preferably more than 0%, more preferably 5% or more, and even more preferably 10% or more. By satisfying the above range, the effect of achieving a high level of both breathability and water pressure resistance (waterproofness) is obtained. 【0027】 The resin content can be adjusted by appropriately adjusting the type of thermoplastic resin, the size of the inorganic particles, and their content. Furthermore, if the film sheet is manufactured through a stretching process of an unstretched sheet, the resin content can also be adjusted by appropriately adjusting the conditions of the stretching process (stretching ratio, etc.). 【0028】In the film sheet of the present invention, typically, the thermoplastic resin, which is a component of the film sheet, forms a network structure. This network structure constitutes the main body of the film sheet. Preferably, this network structure is continuous at least in the direction of the surface of the film sheet, and more preferably, it is continuous in the direction of the thickness of the film sheet. Having such a network structure of thermoplastic resin in the film sheet makes the predetermined effects of the present invention more reliably achieved. Specific examples of the network structure are shown in Figures 1 to 3 and 5. In these specific examples, the thermoplastic resin in film sheets 1 to 3 surrounds a plurality of voids 5 scattered on the surface and inside of film sheets 1 to 3. This forms a network structure 6 that is continuous in both the direction of the surface and the direction of the thickness of film sheets 1 to 3. The "surface direction" refers to the direction along the surface of the film sheet and is the direction that intersects with the direction of the thickness of the film sheet. The "intersection" includes orthogonality. Figure 5 is a cross-section along the thickness direction of the film sheet 2 shown in Figure 2. Here, it can be confirmed that the network structure 6 is continuous in the thickness direction of the film sheet 2 (up and down direction in Figure 5). In the examples in Figures 1 and 3, as in the examples in Figures 2 and 5, the network structure 6 is continuous in the thickness direction. Note that the film sheet 2 shown in Figures 2 and 5 is the film sheet of Embodiment 1, which will be described later. 【0029】Whether or not a film sheet has the network structure can be determined by observing the film sheet using a SEM. Whether or not the network structure is continuous in the direction of the surface of the film sheet can be determined specifically, for example, by the following procedure. First, a 5000x observation field of view of the surface of the film sheet is obtained using a SEM, as shown in Figures 1 to 3. Next, it is determined whether or not the thermoplastic resin has a portion that extends from one end of the observation field to the other. If such a portion is confirmed, it is determined that the network structure is continuous in the direction of the surface of the film sheet. Furthermore, whether or not the network structure is continuous in the thickness direction of the film sheet can be determined specifically, for example, by the following procedure. First, an observation field of view of a cross-section along the thickness direction of the film sheet is obtained using a SEM, as shown in Figure 5. Next, it is determined whether or not the thermoplastic resin has a portion that extends from one end of the observation field to the other. If such a portion is confirmed, it is determined that the network structure is continuous in the thickness direction of the film sheet. The "cross-section along the thickness direction of the film sheet" can be formed as follows. First, the film sheet is immersed in liquid nitrogen. Then, a razor blade is thrust into the surface of the film sheet and struck with a hammer. By pressing the razor blade against the film sheet in this way, a cross-section along the thickness direction of the film sheet can be formed. The "one end of the observation field" and the "other end of the observation field" are typically both ends in a predetermined direction of the observation field (for example, the longitudinal direction of the observation field or a direction perpendicular to the longitudinal direction). 【0030】The film sheet of the present invention typically has a network structure having fibrous portions containing a thermoplastic resin. The fibrous portions typically contain inorganic particles (exposed inorganic particles and non-exposed inorganic particles) in addition to the thermoplastic resin. A specific example is shown in Figures 1 to 3, in which the network structure 6 has a plurality of fibrous portions 7. The fibrous portions 7 are elongated portions mainly composed of thermoplastic resin. Specifically, the fibrous portions 7 are portions that extend in one direction, and whose maximum length (width) in the direction perpendicular to the direction of extension (hereinafter also referred to as the "radial direction") is shorter than the length in the direction of extension. In this specification, the length along the radial direction of the fibrous portions 7 is referred to as the "width". The width of the fibrous portions 7 is the so-called thickness of the fibrous portions 7. The "maximum width" is the thickness of the thickest part of the fibrous portions 7. For example, if the cross-sectional shape along the radial direction of the fibrous portions 7 is a perfect circle, the width of the fibrous portions 7 is the diameter of the perfect circle. For example, if the cross-sectional shape along the radial direction of the fibrous portion 7 is elliptical, the width of the fibrous portion 7 is the length of the major axis of the ellipse. The cross-sectional shape along the radial direction of the fibrous portion 7 is not particularly limited and can be, for example, circular, polygonal, or plate-shaped. The circular shape can be a perfect circle, an ellipse, etc. The polygonal shape can be a triangle, a square, a pentagon, etc. Because the network structure 6 has a fibrous portion 7, the resin occupancy rate tends to be lower compared to the case where there is no fibrous portion 7. Therefore, an improvement in the properties of the film sheet (breathability, moisture permeability, heat shielding, etc.) can be expected due to the reduction in resin occupancy rate, and the predetermined effects of the present invention can be achieved more reliably. 【0031】The width of the fibrous portion 7 is preferably 0.001 μm or more, more preferably 0.01 μm or more, and even more preferably 0.05 μm or more, from the viewpoint of ensuring the strength of the film sheet. Furthermore, the width of the fibrous portion 7 is preferably 10 μm or less, more preferably 5 μm or less, and even more preferably 2 μm or less, from the viewpoint of ensuring breathability and moisture permeability of the film sheet. In this invention, the "fibrous portion" can be defined as "an elongated portion of the film sheet mainly composed of thermoplastic resin, wherein the width of the elongated portion is within the specified range." In addition, the ratio of the length to the width in the extending direction of the "fibrous portion" is preferably 0.5 or more, more preferably 1 or more, and even more preferably 2 or more, as length / width. This results in a film sheet with excellent breathability. Furthermore, the length / width ratio of the fibrous portion is preferably 50 or less, more preferably 40 or less, and even more preferably 30 or less. This results in a film sheet with excellent strength. In this specification, "primarily composed of thermoplastic resin" means that the content of thermoplastic resin in the relevant portion (e.g., fibrous portion) is 30% by mass or more, 40% by mass or more, or 100% by mass or less, relative to the total mass of the relevant portion. The width (maximum width) of the fibrous portion 7 is determined by obtaining an observation image corresponding to a 5000x observation field of view as shown in Figures 1 to 3, and then measuring it using a measuring instrument such as a ruler based on the observation image. 【0032】 In the film sheet of the present invention, typically, at least a portion of the plurality of fibrous portions 7 includes, when focusing on one of the fibrous portions 7, the single fibrous portion 7 and one or more other fibrous portions 7 branching off from the single fibrous portion 7. That is, in the film sheet, the network structure 6 is composed of a plurality of fibrous portions 7. In addition, at least a portion of the network structure 6 includes a structure in which one or more other fibrous portions 7 branch off from one fibrous portion 7. Typically, the plurality of fibrous portions 7 constituting the network structure 6 are joined together at their contact points and are integrated. The contact points are the joining points of the fibrous portions 7, and a plurality of such joining points are scattered throughout the network structure 6. 【0033】 By having the above-mentioned bonding points, the film sheet of the present invention retains its sheet shape without providing fusion points and entanglement points between the fibrous portions 7. Therefore, it is preferable that the film sheet does not have fusion points and entanglement points between the fibrous portions 7. Generally, when a sheet is manufactured by using resin fibers and fusing or entangling the resin fibers, the sheet has fusion points or entanglement points between the fibrous portions made of the resin fibers. Therefore, it is preferable that the film sheet of the present invention is manufactured through a stretching process of an unstretched sheet containing a thermoplastic resin and inorganic particles. Thereby, the fibrous portion 7 is formed in the process of forming voids 5 due to peeling occurring at the interface between the thermoplastic resin and the inorganic particles in the stretching process. In this case, the bonding points are the portions in the unstretched sheet where peeling did not occur in the stretching process. 【0034】 The fibrous portion 7 typically contains inorganic particles. When focusing on a single fibrous portion, it is preferable that the film sheet has a portion S where the "ratio of the particle diameter (maximum length across) of the inorganic particles riding on the fibrous portion 7 to the width of the fibrous portion 7" (hereinafter also referred to as the "inorganic particle diameter / fiber width ratio") is within the following range. The "inorganic particles riding on the fibrous portion 7" refers to the inorganic particles carried and fixed on the fibrous portion 7. From the perspective of ensuring the existence of exposed inorganic particles at the peripheral edge of the void portion 5 and further ensuring the predetermined effects of the present invention, the larger the inorganic particle diameter / fiber width ratio, the more preferable. Specifically, the inorganic particle diameter / fiber width ratio is preferably 0.01 or more, more preferably 0.1 or more, and still more preferably 0.2 or more. Also, from the perspective of imparting practically sufficient strength to the film sheet, the smaller the ratio, the more preferable. Specifically, the inorganic particle diameter / fiber width ratio is preferably 1000 or less, more preferably 500 or less, and still more preferably 300 or less. The "particle diameter (maximum length across) of the inorganic particles" and the "width of the fibrous portion" are obtained by acquiring an observation image corresponding to a 5000-fold observation field and actually measuring them using a measuring instrument such as a ruler based on the observation image. 【0035】From the viewpoint of more reliably expressing the functions of inorganic particles, it is preferable that the fibrous portion 7 has portions where the width of the fibrous portion 7 is smaller than the particle diameter of the inorganic particles, when focusing on a single fibrous portion. That is, it is preferable that the ratio of inorganic particle diameter to fiber width of portion S exceeds 1. Specifically, the ratio of inorganic particle diameter to fiber width of portion S is preferably 1 or more, more preferably 2 or more, and even more preferably 3 or more. Furthermore, from the viewpoint of reliably supporting inorganic particles in the fibrous portion 7, the ratio of inorganic particle diameter to fiber width of portion S is preferably 20 or less, more preferably 10 or less, and even more preferably 5 or less. 【0036】The film sheet of the present invention preferably has a plurality of fibrous portions having a predetermined array direction (extending direction). Specifically, in the film sheet of the present invention, in a 5000-fold observation field of view, the degree of orientation measured by the following method of the fibrous portion is preferably in the following range. The degree of orientation is an index of the orientation of the fibrous portion in two directions orthogonal to each other in the film sheet. When the number of fibrous portions extending along one direction is the same as that of the fibrous portions extending along the other direction, the degree of orientation is 1. The larger the degree of orientation exceeds 1 or the smaller it is than 1, the more the extending direction of the fibrous portion is biased toward either one of the two directions. Therefore, the closer the degree of orientation is to 1, the smaller the anisotropy of the fibrous portion in the film sheet. The smaller the anisotropy of the fibrous portion, the better the mechanical properties, for example, the higher the water pressure resistance. From the viewpoint of obtaining a film sheet with excellent mechanical properties, the degree of orientation of the fibrous portion is preferably 0.3 or more and 3 or less, more preferably 0.5 or more and 2 or less, and still more preferably 0.7 or more and 1.5 or less. The above effects are particularly remarkable when the film sheet is mainly composed of fibrous portions. The term "mainly composed of fibrous portions" as used herein means that in a 5000-fold observation field of view on one surface of the film sheet, the ratio of the total area of the fibrous portions (hereinafter also referred to as "fibrous portion occupancy rate") in the total area of the observation field of view is preferably 20% or more and 100% or less, more preferably 40% or more. The "total area of the fibrous portions" can be obtained by subtracting the total area of the portions other than the fibrous portions (non-fibrous portions described later) in the observation field of view from the area of the 5000-fold observation field of view. 【0037】<Method for measuring the degree of orientation of fibrous portions> This will be explained with reference to Figure 6. Figure 6 shows a schematic diagram of the observation image OI, which is an image taken by magnifying one surface of the film sheet to be measured 5000 times with an SEM. The observation image OI is the image corresponding to the 5000x observation field of view. A square SQ with a side length of 15 μm is created on the observation image OI. The number of fibrous portions 7 that cross both the top and bottom pair of sides L1 and L2 of the square SQ is called the "top and bottom fiber count," and the number of fibrous portions 7 that cross both the left and right pair of sides L3 and L4 of the square SQ is called the "left and right fiber count." The ratio of the left and right fiber count to the top and bottom fiber count (left and right fiber count / top and bottom fiber count) is calculated, and this ratio is taken as the degree of orientation of the fibrous portion of the film sheet to be measured. 【0038】 The degree of orientation of the fibrous portions of a film sheet can be adjusted by appropriately adjusting the manufacturing method. Specifically, the manufacturing method for the film sheet involves a step of stretching an unstretched sheet containing inorganic particles. The stretching method in this step is then appropriately adjusted. When uniaxial stretching is used as the stretching method, multiple fibrous portions in the resulting film sheet extend along the stretching direction. Therefore, the degree of orientation of the fibrous portions is generally large. On the other hand, when biaxial stretching is used as the stretching method, the degree of orientation of the fibrous portions can be reduced. Specifically, the first stretching produces a sheet that is strongly oriented in the stretching direction. Subsequently, a second stretching is performed in a direction intersecting the first stretching direction (stretching crossing direction). As a result, the fibrous portions that were initially oriented in the stretching direction are also pulled in the stretching crossing direction. Consequently, the final degree of orientation is reduced. The final degree of orientation can be particularly reduced if the stretching crossing direction is perpendicular to the stretching method. 【0039】From the viewpoint of improving the mechanical properties (water pressure resistance, etc.) of the film sheet, the planar shape of the void portion of the film sheet is preferably a shape with low anisotropy, and one of the ideal planar shapes is a perfect circle. In the examples shown in Figures 1 and 2, the planar shape of the void portion 5 is closer to a circle or ellipse than in the example shown in Figure 3, and has less anisotropy than the void portion 5 of the film sheet 3. Based on the above, from the viewpoint of improving the mechanical properties of the film sheet, in the 5000x observation field of view of one surface of the film sheet, it is preferable that at least a portion of the multiple void portions has a ratio of the length in the long axis direction to the length in the short axis direction within a specific range. Here, the specific range is preferably 0.3 or more and 3 or less, more preferably 0.5 or more and 2 or less, and even more preferably 0.7 or more and 1.5 or less as the length in the long axis direction / length in the short axis direction. The "long axis direction" refers to the direction of extension of the portion having the maximum span length in the void portion in the 5000x observation field of view. The "length in the long axis direction" refers to the maximum span length. The aforementioned "length in the short axis direction" refers to the maximum span of the gap in the direction perpendicular to the aforementioned long axis direction. 【0040】 In the present invention, it is preferable that, in a 5000x observation field, the void portion 5 located on the surface of the film sheet and the fibrous portion 7 located inside the film sheet overlap in the thickness direction of the film sheet. In other words, when the void portion 5 located on the surface of the film sheet and the fibrous portion 7 located inside the film sheet are projected in the thickness direction of the film sheet, it is preferable that the projected images of the two overlap. The film sheet has such a structure, resulting in excellent breathability. 【0041】 In the film sheet of the present invention, the network structure may have non-fibrous portions other than the plurality of fibrous portions. As a result, a film sheet having non-fibrous portions tends to have superior strength compared to a film sheet without non-fibrous portions. In the specific example shown in Figure 2, the network structure 6 of the film sheet 2 has non-fibrous portions 8 in addition to the fibrous portions 7. On the other hand, in the specific example shown in Figure 1, the network structure 6 of the film sheet 1 does not have non-fibrous portions 8. 【0042】 The "non-fibrous portion" is a non-elongated portion in the network structure. In other words, the "non-fibrous portion" is a part of the network structure made of thermoplastic resin where no fibrous portion exists. In the "non-fibrous portion," the ratio of the maximum extension length to the minimum extension length in a 5000x observation field is preferably 0.3 to 3, more preferably 0.5 to 2, and even more preferably 0.7 to 1.5, as maximum extension length / minimum extension length. This results in a film sheet with excellent strength. The "non-fibrous portion" in this invention can be defined as "a portion of the film sheet other than the fibrous portion, mainly made of thermoplastic resin, where the ratio of the maximum extension length to the minimum extension length in a 5000x observation field is within the specified range." The "minimum extension length" and "minimum extension length" are determined by acquiring an observation image corresponding to the 5000x observation field and measuring it using a measuring instrument such as a ruler based on the observation image. 【0043】 In the present invention, it is preferable that, in a 5000x observation field, the void portion 5 located on the surface of the film sheet and the non-fibrous portion 8 located inside the film sheet overlap in the thickness direction of the film sheet. In other words, when the void portion 5 located on the surface of the film sheet and the non-fibrous portion 8 located inside the film sheet are projected in the thickness direction of the film sheet, it is preferable that the projected images of the two overlap. Due to these characteristics, the film sheet has excellent strength, and specifically, for example, excellent water pressure resistance. 【0044】The film sheet of the present invention typically contains a thermoplastic resin. From the viewpoint of ensuring the toughness of the film sheet, the thermoplastic resin content in the film sheet of the present invention is preferably 10% by mass or more, more preferably 25% by mass or more, and even more preferably 35% by mass or more, based on the total mass of the film sheet. Furthermore, from the viewpoint of ensuring breathability and moisture permeability of the film sheet, the thermoplastic resin content in the film sheet of the present invention is preferably 80% by mass or less, more preferably 70% by mass or less, and even more preferably 65% ​​by mass or less. 【0045】 The thermoplastic resin used in this invention, that is, the thermoplastic resin that forms the main body of the film sheet of this invention, is a thermoplastic resin other than an acrylic polymer. The film sheet of this invention does not contain an acrylic polymer as the main body of the film sheet. However, it may contain an acrylic polymer as a dispersant along with a thermoplastic resin other than an acrylic polymer and a plurality of inorganic particles. This will be described later. 【0046】The thermoplastic resin used in this invention is, provided that it is a thermoplastic resin other than an acrylic polymer, any thermoplastic resin conventionally used in this type of film sheet can be used without particular limitation. For example, it may include one or more selected from polyolefin resins, polyester resins, polyamide resins, and vinyl resins. The polyolefin resin may include one or more selected from polyethylene, polypropylene (PP), ethylene-α-olefin copolymer, and ethylene-propylene copolymer. The PE may include one or more selected from high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene (LLDPE). The polyester resin may include one or more selected from polyethylene terephthalate, polybutylene terephthalate, and polylactic acid resins. The polylactic acid resin may include one or more selected from polylactic acid and lactic acid-hydroxycarboxylic acid copolymer. The vinyl resin may include one or more selected from polyvinyl chloride, polyvinylidene chloride, and polystyrene. 【0047】 From the viewpoint of improving thermal stability, the thermoplastic resin preferably contains a polyolefin resin. The polyolefin resin content in the thermoplastic resin in the film sheet is 90% by mass or more and 100% by mass or less, preferably 95% by mass or more and 100% by mass or less, and more preferably 100% by mass, based on the total mass of the thermoplastic resin. Whether or not the thermoplastic resin constituting the film sheet contains a polyolefin resin, and the content of the polyolefin resin in the thermoplastic resin, can be confirmed by NMR spectroscopy, IR spectroscopy, or the like. 【0048】From the viewpoint of ensuring that the predetermined effects of the present invention are achieved more reliably, the thermoplastic resin used in the present invention has a melt flow rate (MFR) measured in accordance with JIS K 7210, preferably 0.5 g / min to 100 g / 10 min, more preferably 1 g / 10 min to 60 g / 10 min, and even more preferably 2 g / 10 min to 15 g / 10 min. The MFR can be measured in accordance with JIS K 7210 by heating and loading according to the type of polyolefin resin. For example, when polypropylene, which is a polyolefin resin, is used as the thermoplastic resin, it is measured under conditions of a temperature of 190°C and a load of 21.18 N. 【0049】 From the viewpoint of ensuring that the predetermined effects of the present invention are achieved more reliably, the content of the plurality of inorganic particles in the film sheet of the present invention is preferably 30% by mass or more, more preferably 35% by mass or more, and even more preferably 40% by mass or more, based on the total mass of the film sheet. Furthermore, from the viewpoint of improving stretchability, the content of the plurality of inorganic particles is preferably 50% by mass or less, more preferably 45% by mass or less, and even more preferably 43% by mass or less. The content of the plurality of inorganic particles in the film sheet can be measured using an EDS-equipped SEM. 【0050】The inorganic particles used in this invention are not particularly limited to those conventionally used in this type of film sheet. For example, they may include one or more selected from minerals, metal carbonates, metal oxides, metal sulfates, metal phosphates, metal hydroxides, carbon particles, and metal particles. The minerals may include one or more selected from gypsum, talc, clay, kaolin, silica, mica, aluminosilicate, and diatomaceous earth. The metal carbonates may include one or more selected from calcium carbonate, magnesium carbonate, and barium carbonate. The metal oxides may include one or more selected from aluminum oxide, aluminum oxide, zinc oxide, and titanium oxide. The metal sulfates may include one or more selected from sodium sulfate, calcium sulfate, magnesium sulfate, and barium sulfate. The metal phosphates may include calcium phosphate. The metal hydroxides may include aluminum hydroxide. The carbon particles may include one or more selected from activated carbon and carbon black. The metal particles may include one or more selected from aluminum powder, iron powder, and copper powder. The shape of the inorganic particles is not particularly limited and may be spherical, lumpy, fibrous, or amorphous, for example. 【0051】 From the viewpoint of improving the handling and moldability of the film sheet, the inorganic particles preferably contain one or more selected from zinc oxide, calcium carbonate, aluminosilicate, and titanium oxide. 【0052】In the present invention, it is preferable that the inorganic particles themselves are not covered by other substances. Here, "inorganic particles themselves are not covered by other substances" means that, in the state before they are incorporated into the film sheet (the state of the raw materials before they are used in the manufacture of the film sheet), the surface of the inorganic particles is not covered by other substances. In other words, it means that the surface state inherent to the inorganic particles is exposed. For example, surface-treated inorganic particles, on which a dispersant is adsorbed onto the surface of the inorganic particles, are often used as raw materials to improve the dispersibility of inorganic particles in the film sheet. In the present invention, it is preferable that such surface-treated inorganic particles are substantially absent. Because the inorganic particles themselves are not covered by other substances, it becomes easier to impart the functions that the inorganic particles possess to the film sheet. 【0053】Whether or not inorganic particles themselves are covered by other substances can be confirmed by observing the surface of the film sheet using a scanning electron microscope (SEM). It can also be confirmed by whether or not the film sheet exhibits the function of the inorganic particles. For example, if the inorganic particles contained in the film sheet are zinc oxide, an acetic acid gas adsorption test is performed on the film sheet. If adsorption of acetic acid gas by the film sheet is observed, it is evaluated that the inorganic particles (zinc oxide) themselves are not covered by other substances in the film sheet. Here, "inorganic particles themselves are not covered by other substances" is not limited to a state where all of the multiple inorganic particles contained in the film sheet are not covered by other substances. It includes a state where some of the multiple inorganic particles are covered by other substances, provided that the function of the inorganic particles can be exhibited. The acetic acid gas adsorption test can be performed using the following procedure: The film sheet to be evaluated and acetic acid gas are sealed inside a 5L non-permeable bag, the bag is left to stand for 30 minutes, and then the concentration of acetic acid gas inside the bag is measured. If the concentration of acetic acid gas after standing for 30 minutes is lower than that before standing for 30 minutes, it is considered that adsorption of acetic acid gas occurred by the film sheet. In other words, it is considered that the inorganic particles (zinc oxide) themselves are not covered by other substances. The concentration of acetic acid gas can be measured using a gas concentration meter (detector tube manufactured by Gastec Co., Ltd.). 【0054】 From the viewpoint of ensuring that the predetermined effects of the present invention are achieved more reliably, the average particle size of the inorganic particles is preferably 0.1 μm to 10 μm, more preferably 0.5 μm to 5 μm, and even more preferably 1 μm to 3 μm. By adjusting the average particle size of the inorganic particles to the above preferred range, when a manufacturing method for a film sheet is adopted that includes a step of stretching a sheet containing inorganic particles, the sheet becomes less likely to break during this step. The average particle size of the inorganic particles can be measured by the following method. 【0055】<Method for measuring the average particle diameter of inorganic particles> The average particle diameter of inorganic particles can be determined as the volume-based median diameter measured by a laser diffraction particle size distribution analyzer. The median diameter is measured using a LA-950V2 manufactured by Horiba, Ltd., with a standard dry cell, and the refractive index is set to 3.5 for the real part and 3.8i for the imaginary part. 【0056】 The film sheet of the present invention may further contain a dispersant for inorganic particles (hereinafter also simply referred to as "dispersant") in addition to the thermoplastic resin and inorganic particles. By including a dispersant in the film sheet, the dispersibility of inorganic particles in the film sheet is improved, making it easier to adjust the void occupancy rate to the specified range. 【0057】From the viewpoint of improving the dispersibility of inorganic particles without covering their surface, the film sheet of the present invention preferably contains an acrylic polymer. The acrylic polymer functions as a dispersant in a film sheet containing a thermoplastic resin other than the acrylic polymer and inorganic particles. The acrylic polymer may be a monomeric (co)polymer. The monomer may include one or more selected from acrylic acid and its derivatives, methacrylic acid and its derivatives, crotonic acid and its derivatives, acrylamide, acrylalkylamide, acrylonitrile, diacetone acrylamide, and methacrylamide. The acrylic polymer may include one or more selected from acrylic acid esters and methacrylic acid esters as constituent units. Specifically, the acrylic polymer may include one or more selected from polymers of acrylic acid esters, polymers of methacrylic acid esters, and copolymers of acrylic acid esters and methacrylic acid esters. The acrylic acid ester may include alkyl acrylates. The methacrylic acid ester may include alkyl methacrylic acid esters. The copolymer of the acrylic acid ester and the methacrylic acid ester may include an alkyl methacrylate / alkyl acrylate copolymer. The acrylic polymer preferably has a total proportion of constituent units derived from alkyl acrylate and constituent units derived from alkyl methacrylate of 70 mol% or more, more preferably 80 mol% or more, even more preferably 90 mol% or more, or particularly preferably 95 mol% or more. 【0058】 The acrylic polymer content in the film sheet of the present invention is preferably 1.1% by mass or more and 20% by mass or less, more preferably 2% by mass or more and 10% by mass or less, and even more preferably 2.5% by mass or more and 5% by mass or less, based on the total mass of the film sheet. 【0059】From the viewpoint of improving the dispersibility of inorganic particles, the film sheet of the present invention preferably further contains, in addition to the acrylic polymer, one or more selected from silicone oil and hydrocarbon oil. The silicone oil may include one or more selected from methylpolysiloxane and higher alcohol-modified organopolysiloxane. The methylpolysiloxane may include one or more selected from dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane and methylhydrogenpolysiloxane. In this specification, the hydrocarbon oil is a concept that includes fatty acids and their salts and esters. The hydrocarbon oil may include caprylic acid, palmitic acid, oleic acid, stearic acid, capric acid, lauric acid, erucic acid, myristic acid and their salts, and one or more selected from the following polyesters. The polyester includes those obtained from polybasic acids and polyhydric alcohols, and / or those obtained from monobasic acids having 14 to 22 carbon atoms and monohydric alcohols having 12 to 22 carbon atoms. 【0060】 The total content of silicone oil and hydrocarbon oil in the film sheet of the present invention is preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 3% by mass or more, based on the total mass of the film sheet. This allows for good dispersibility of inorganic particles in the film sheet. Furthermore, when a film sheet is manufactured by performing a stretching process on an unstretched sheet containing thermoplastic resin and inorganic particles, the porosity of the unstretched sheet during stretching can be improved. Good porosity makes it easier to obtain a film sheet with good air permeability and water pressure resistance. Furthermore, the total content of silicone oil and hydrocarbon oil in the film sheet of the present invention is preferably 20% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less, based on the total mass of the film sheet. This prevents oil derived from silicone oil or hydrocarbon oil from seeping out of the film sheet (bleed-out). 【0061】Whether or not the film sheet contains the aforementioned dispersant, acrylic polymer, silicone oil, and hydrocarbon oil can be confirmed using an EDS-equipped SEM. 【0062】 The film sheet of the present invention preferably contains substantially no β-nucleating agent. In film sheets mainly composed of this type of thermoplastic resin, a resin nucleating agent may be used to change the crystal structure of the thermoplastic resin and obtain desired properties. For example, when PP is used as the thermoplastic resin, a β-nucleating agent may be included in the film sheet to change the crystal structure of PP to β-crystal. The film sheet of the present invention can exhibit the desired effects even without containing a β-nucleating agent by undergoing biaxial stretching during manufacturing. Furthermore, by not including a β-nucleating agent in the film sheet, stretching during manufacturing can be facilitated. Confirmation of whether or not a β-nucleating agent is contained in the film sheet, and measurement of the β-nucleating agent content in the film sheet, can be performed using IR spectroscopy or the like. 【0063】 The film sheet of the present invention preferably contains substantially no fluorine-containing compounds. Fluorine-containing compounds may be included in the film sheet, for example, to improve the dispersibility of inorganic particles or to improve resin processability. The film sheet of the present invention can achieve the desired effects without containing fluorine-containing compounds by incorporating acrylic polymers and / or silicone oils. Furthermore, by adjusting the content of fluorine-containing compounds in the film sheet to the aforementioned specific range, the environmental impact can be reduced. 【0064】 In this specification, "substantially free" means that the content of the said component (e.g., fluorine-containing compound) in the film sheet of the present invention is specifically 0% by mass or more and 1.0% by mass or less, more specifically 0.8% by mass or less, and even more specifically 0.5% by mass or less, based on the total mass of the film sheet. 【0065】The permeability of a film sheet is expressed by its air permeability. Air permeability can be measured according to JIS P8117:2009. Air permeability is expressed as the time required for a certain amount of air to pass through the object being measured (film sheet). A smaller air permeability value means that the object being measured has better permeability. From the viewpoint of ensuring the strength of the film sheet, the air permeability of the film sheet of the present invention is preferably 0 seconds / 100 mL or more, more preferably 50 seconds / 100 mL or more. Furthermore, from the viewpoint of ensuring moisture permeability, the air permeability of the film sheet is preferably 20,000 seconds / 100 mL or less, more preferably 6,000 seconds / 100 mL or less, even more preferably 5,000 seconds / 100 mL or less, and even more preferably 4,000 seconds / 100 mL or less. Air permeability can be adjusted by adjusting the resin occupancy rate of the film sheet. 【0066】 The air permeability of the film sheet of the present invention is preferably adjusted appropriately depending on the application of the film sheet. For example, when the film sheet of the present invention is used as a sheet for clothing, the air permeability of the film sheet is preferably 10 seconds / 100 mL or more, more preferably 50 seconds / 100 mL or more, and even more preferably 100 seconds / 100 mL or more, from the viewpoint of ensuring the strength of the film sheet. Also, when the film sheet of the present invention is used as a sheet for clothing, the air permeability of the film sheet is preferably 3000 seconds / 100 mL or less, more preferably 1000 seconds / 100 mL or less, and even more preferably 800 seconds / 100 mL or less, from the viewpoint of reducing stuffiness. 【0067】 From the viewpoint of reducing stuffiness, the film sheet of the present invention preferably has a moisture permeability of 2000 g / m². ２ ・24 hours or more, more preferably 3000 g / m² ２ ・24 hours or more, more preferably 4000 g / m² ２ - It must be 24 hours or more. Also, from the viewpoint of ensuring the strength of the film sheet, the moisture permeability is preferably 20,000 g / m². ２ ・24 hours or less, more preferably 15,000 g / m² ２ ・24 hours or less, more preferably 10,000 g / m² ２- The moisture permeability is 24 hours or less. Film sheets with a moisture permeability within this range are particularly useful as clothing sheets. Moisture permeability can be measured according to JIS Z0208. Moisture permeability can be adjusted by adjusting the resin occupancy rate of the film sheet. 【0068】 The film sheet of the present invention, from the viewpoint of ensuring waterproofness that can prevent the intrusion of rainwater, has a water pressure resistance of preferably 10,000 mmAq or more, more preferably 15,000 mmAq or more, and even more preferably 20,000 mmAq or more. Furthermore, from the viewpoint of achieving compatibility with breathability, the water pressure resistance is preferably 100,000 mmAq or less, more preferably 80,000 mmAq or less, and even more preferably 50,000 mmAq or less. The water pressure resistance can be measured according to the water resistance test (hydrostatic pressure method) Method A (low water pressure method) of JIS L1092-1998. The water pressure resistance can be adjusted by adjusting the resin occupancy rate of the film sheet. 【0069】 The through-holes in a typical nonwoven fabric, which penetrate the nonwoven fabric in the thickness direction, consist of voids between the constituent fibers of the nonwoven fabric. The maximum span of the through-hole in a plan view is usually greater than 100 μm, and typically greater than 100 μm and less than or equal to 10,000 μm. The film sheet of the present invention preferably has through-holes that penetrate the film sheet in the thickness direction. From the viewpoint of ensuring breathability and moisture permeability, it is preferable that the through-holes consist only of through-holes whose maximum span in a plan view is greater than 0 μm and less than or equal to 100 μm (hereinafter also referred to as "specific through-holes"). In other words, it is preferable that the film sheet of the present invention does not have through-holes with a maximum span of greater than 100 μm, as is seen in typical nonwoven fabrics. The fact that the film sheet may consist only of specific through-holes indicates that it is not manufactured using resin fibers as raw materials like a nonwoven fabric, but rather manufactured through a stretching process of an unstretched sheet containing thermoplastic resin and inorganic particles. Whether or not a film sheet contains only specific types of through-holes can be determined by observing the film sheet using a scanning electron microscope (SEM). 【0070】The thickness of the film sheet of the present invention is not particularly limited and can be appropriately adjusted according to the use of the film sheet and the like. For example, when the film sheet of the present invention is used as a moisture-permeable sheet, a clothing sheet, a heat-insulating sheet or an agricultural sheet, the thickness of the film sheet is preferably more than 0 μm and 100 μm or less. When used as a moisture-permeable sheet or a clothing sheet, the thickness of the film sheet is more preferably 20 μm or more and 50 μm or less. When used as a heat-insulating sheet or an agricultural sheet, the thickness of the film sheet is more preferably 40 μm or more and 100 μm or less. The thickness of a general non-woven fabric is usually 100 μm or more and 3000 μm or less. That is, the film sheet of the present invention is typically significantly thinner than a general non-woven fabric. In the present specification, "the thickness of the film sheet" refers to the thickness under a load of 0.8 kPa. The thickness of the film sheet can be measured using a micrometer MDH-25MB manufactured by Mitutoyo Corporation. 【0071】 The basis weight of the film sheet of the present invention is not particularly limited and can be appropriately adjusted according to the use of the film sheet and the like. For example, when the film sheet of the present invention is used as a moisture-permeable sheet, a clothing sheet, a heat-insulating sheet or an agricultural sheet, the basis weight of the film sheet is usually 30 g / m ２ or more and 80 g / m ２ or less. When used as a moisture-permeable sheet or a clothing sheet, the basis weight of the film sheet is more preferably 10 g / m ２ or more and 50 g / m ２ or less. When used as a heat-insulating sheet or an agricultural sheet, the basis weight of the film sheet is more preferably 40 g / m ２ or more and 120 g / m ２ or less. 【0072】The film sheet of the present invention is particularly useful as a moisture-permeable sheet, a sheet for clothing, a heat-shielding sheet, or an agricultural sheet. The moisture-permeable sheet refers to a sheet used in applications where moisture permeability is required. Moisture-permeable sheets include those used in absorbent articles and fabrics used in clothing, shoes, hats, outdoor goods, etc. The absorbent articles refer to articles used to absorb bodily fluids (urine, loose stools, menstrual blood, sweat, etc.) discharged from the human body, and include disposable diapers, sanitary napkins, sanitary shorts, and incontinence pads. The film sheet of the present invention is useful, for example, as a backing sheet placed on the outer side (opposite the side facing the wearer's skin) of an absorbent article. The sheet for clothing refers to a sheet used in the manufacture of clothing. The film sheet of the present invention is useful, for example, in clothing such as raincoats that require waterproofing and moisture permeability. The heat-shielding sheet refers to a sheet used in applications where heat shielding is required. Heat-shielding sheets include sheets used in the manufacture of cars, building materials, clothing fabrics, outdoor goods, and curtains. The agricultural sheet refers to a sheet used in agriculture. 【0073】 An example of a film sheet suitable for a moisture-permeable sheet is the following film sheet X. Film sheet X contains PP as a thermoplastic resin other than the acrylic polymer. Film sheet X contains one or more inorganic particles selected from calcium carbonate, zinc oxide, titanium dioxide, and aluminosilicate. In addition, film sheet X contains an alkyl methacrylate / alkyl acrylate copolymer as the acrylic polymer which acts as a dispersant. Film sheet X contains one or more silicone oils selected from dimethylpolysiloxane and methylhydrogenpolysiloxane. Film sheet X contains stearic acid as the hydrocarbon oil. 【0074】The film sheet of the present invention may be a single sheet. In this specification, "single sheet" means that the portion that can achieve all the effects expected of the sheet is realized in a single sheet. Specifically, as described above, the film sheet of the present invention achieves the effect of achieving both high levels of breathability and water pressure resistance. When the film sheet is a single sheet, this balance is achieved by the film sheet alone, rather than by lamination with other sheets. "Single sheet" can also mean a sheet in which a part of the sheet can achieve the effects expected of the sheet. A single sheet may have a single-layer structure or a laminated structure. If a single sheet has a laminated structure, each of the multiple layers constituting the laminated structure will achieve the effects expected of the sheet. For example, a sheet that includes a layer that can achieve only a part of the effects expected of the sheet (for example, only high levels of breathability) and a layer that can achieve only another part of the effects (for example, only high levels of water pressure resistance) is not a "single sheet" in this specification. Compared to such sheets, a single sheet has the advantage that even if a part of the sheet is missing, the other parts can maintain the effect expected from the sheet. 【0075】 The present invention includes sheet articles having a laminated structure of the film sheet of the present invention and other sheets other than the film sheet. The other sheets are not particularly limited and include, for example, woven fabrics, nonwoven fabrics, paper, and resin sheets other than the film sheet. The laminated structure may be a two-layer structure of the film sheet and the other sheet, or it may be a three-layer or more laminated structure in which the film sheet or the other sheet is joined to one or both sides of the two-layer structure. Each layer constituting the laminated structure is joined and integrated with each other by known joining means such as adhesives and fusion. 【0076】In one preferred embodiment of the sheet article of the present invention, the other sheet is arranged on one side of the film sheet, and the other side of the film sheet is exposed. In this way, by exposing one side of the film sheet without being covered by the other sheet, the characteristics of the film sheet, such as high breathability and high moisture permeability, are more easily exhibited. In this embodiment, the other sheet is preferably a woven fabric. The sheet article of the present invention is particularly useful as a moisture-permeable sheet, a sheet for clothing, a heat-shielding sheet, or an agricultural sheet. 【0077】 The present invention includes wearable articles containing a film sheet. The wearable article of the present invention will be described below. The wearable article of the present invention will be described in a manner different from that of the film sheet of the present invention. For configurations of the wearable article of the present invention that are not described, the above-mentioned description of the film sheet of the present invention will apply as appropriate. 【0078】 The film sheet constituting the wearable article of the present invention preferably contains a thermoplastic resin and a plurality of inorganic particles. In the film sheet, typically, a plurality of voids where the thermoplastic resin is absent extend through the thermoplastic resin. It is preferable that exposed inorganic particles, among the plurality of inorganic particles, which have portions exposed from the thermoplastic resin, are present at the periphery of the plurality of voids. A preferred example of the film sheet constituting the wearable article of the present invention is the film sheet of the present invention described above. In this preferred example, the film sheet constituting the wearable article of the present invention typically has a network structure formed by the thermoplastic resin, which is a component of the film sheet, and this network structure constitutes the main body of the film sheet. In this network structure, a plurality of voids extend through the thermoplastic resin. 【0079】The wearable articles of the present invention may be clothing, shoes, hats, or articles used to absorb bodily fluids discharged from the human body (hereinafter also referred to as "bodily fluid-absorbing articles"). Examples of clothing include rainwear, sportswear, and outdoor wear. In the clothing, the film sheet may function as, for example, a breathable waterproof film, a deodorizing film, or a heat-shielding film. In the shoes, the film sheet may function as, for example, a breathable waterproof film or a deodorizing film. In the hat, the film sheet may function as, for example, a breathable waterproof film, a deodorizing film, or a heat-shielding film. Examples of bodily fluid-absorbing articles include disposable diapers, sanitary napkins, and incontinence pads. In the bodily fluid-absorbing articles, the film sheet may function as, for example, a surface sheet positioned to come into contact with the wearer's skin when worn, or as a waterproof film used as the outer layer of the bodily fluid-absorbing article. 【0080】 The method for manufacturing the film sheet of the present invention will be described below. For aspects of the method for manufacturing the film sheet of the present invention that are not specifically described, the above-mentioned description of the film sheet of the present invention will apply as appropriate. 【0081】 The present invention provides a method for manufacturing a film sheet, which typically includes a step of stretching an unstretched sheet containing a thermoplastic resin and inorganic particles (stretching step). The unstretched sheet is typically manufactured by a step of manufacturing a resin composition containing a thermoplastic resin and inorganic particles (resin composition manufacturing step) and a step of molding the resin composition into a sheet (molding step). The present invention provides a method for manufacturing a film sheet, which may include the resin composition manufacturing step and the molding step before the stretching step. 【0082】The resin composition manufacturing process can be carried out, for example, by heating and kneading raw materials containing a thermoplastic resin and inorganic particles in a single-screw or twin-screw extruder. This yields a molten resin composition. The content of thermoplastic resin and inorganic particles in the resin composition can be appropriately adjusted so that the content in the film sheet to be manufactured falls within the aforementioned range. If the film sheet to be manufactured contains other components (e.g., a dispersant for inorganic particles) in addition to the thermoplastic resin and inorganic particles, these other components can be included in the raw materials. The heating temperature in the heating and kneading process (the temperature of the raw materials during heating and kneading) can be set according to the type of thermoplastic resin. For example, for polyolefin resin, the temperature can be 120°C to 210°C. 【0083】 In the molding process, the molten resin composition produced in the resin composition manufacturing process is molded into a sheet using a molding apparatus to obtain a molded body. Next, the molded body is cooled to produce an unstretched sheet. Since the unstretched sheet is formed from a resin composition containing a thermoplastic resin and inorganic particles, the composition of the resin composition and the unstretched sheet are substantially the same. The molding apparatus is not particularly limited, and for example, a T-die extrusion molding apparatus or an inflation molding apparatus can be used. The heating temperature during molding (temperature of the resin composition during molding) is not particularly limited as long as it is at least a temperature at which the resin composition can melt. From the viewpoint of ease of molding and prevention of thermal decomposition of components in the resin composition, it is preferable that the temperature is (Y + 20)°C or higher and (Y + 60)°C or lower, where Y (°C) is the melting point of the thermoplastic resin used as raw material. If there are multiple types of thermoplastic resins in the resin composition, the melting point of the thermoplastic resin with the highest melting point among those multiple types of thermoplastic resins is defined as Y. The cooling of the molded body may be natural cooling by leaving the molded body in a room temperature environment, or it may be forced rapid cooling using a cooling means. 【0084】In the stretching step, an unstretched sheet containing a thermoplastic resin and inorganic particles is stretched. Stretching causes interfacial delamination between the thermoplastic resin and inorganic particles in the unstretched sheet, resulting in the thermoplastic resin becoming porous. The porous thermoplastic resin, while surrounding the multiple voids scattered on its surface and within, forms a continuous network structure in both the surface direction and the thickness direction of the sheet. Thus, a film sheet having the network structure is obtained. 【0085】 The stretching of the unstretched sheet in the stretching process may be uniaxial or biaxial, but biaxial stretching is preferred. Uniaxial or biaxial stretching of the unstretched sheet can be carried out using conventionally known methods. For example, it can be carried out using the roll method or the tenter method. Film sheets manufactured by biaxial stretching have less anisotropy in the fibrous portion and superior mechanical properties compared to film sheets manufactured by uniaxial stretching. Film sheets 1 and 2 in Figures 1 and 2 were manufactured by biaxial stretching, and film sheet 3 in Figure 3 was manufactured by uniaxial stretching. 【0086】 The following describes the case in which an unstretched sheet is biaxially stretched. In this case, the method for manufacturing a film sheet of the present invention can be carried out by a sequential biaxial stretching method. One embodiment of the method for manufacturing a film sheet of the present invention includes the step of applying a first stretch in one direction to an unstretched sheet containing a thermoplastic resin and a plurality of inorganic particles, and then applying a second stretch in a direction intersecting the first stretch. 【0087】Typically, in the first stretching, a long, continuous strip of sheet to be stretched (unstretched sheet) is conveyed in one direction and introduced into a group of rolls, where it is stretched between two rolls with different peripheral speeds in that direction. The one direction is typically the conveying direction MD of the sheet to be stretched. The first stretching stretches the sheet to be stretched in the MD direction. In the subsequent second stretching, both ends of the sheet that has undergone the first stretching are gripped with clips and introduced into a tenter (lateral stretcher), where it is stretched in a direction intersecting the aforementioned one direction (MD). The stretching direction of the second stretching is typically a direction (CD) perpendicular to the aforementioned one direction (MD). After the first stretching and before the second stretching, the sheet to be stretched may be cooled. 【0088】 The first stretching is preferably performed while heating the sheet to be stretched (unstretched sheet). The method of heating the sheet to be stretched in the first stretching is not particularly limited, and examples include contacting the sheet to be stretched with heated rolls such as the roll group, or heating the sheet to be stretched with hot air or a heater. The heating temperature of the sheet to be stretched in the first stretching is preferably (Y1-100)°C or higher and (Y1-10)°C or lower, and more preferably (Y1-80)°C or higher and (Y1-40)°C or lower, where Y1 (°C) is the melting point of the thermoplastic resin used as the raw material. If there are multiple types of thermoplastic resins contained in the sheet to be stretched, the melting point of the thermoplastic resin with the highest melting point among those multiple types of thermoplastic resins is set as Y1. 【0089】 The stretching ratio in the first stretching is preferably 1.2 times or more, more preferably 1.5 times or more, and even more preferably 2 times or more, from the viewpoint of ensuring uniformity in the second stretching. Furthermore, from the viewpoint of preventing unintended tearing after stretching, the stretching ratio is preferably 9 times or less, more preferably 7 times or less, and even more preferably 5 times or less. By setting the stretching ratio in the first stretching to the above-mentioned specific range, it becomes easier to obtain a film sheet in which the void occupancy rate is within the above-mentioned specific range. 【0090】The stretching speed of the sheet to be stretched in the first stretching is preferably 100 mm / second or more and 1000 m / second or less, more preferably 300 mm / second or more and 100 m / second or less. By setting the stretching speed in the first stretching to the above-mentioned specific range, it becomes easier to obtain a film sheet in which the resin occupancy rate is within the above-mentioned specific range. 【0091】 The second stretching is preferably performed while heating the sheet to be stretched (unstretched sheet). The method of heating the sheet to be stretched in the second stretching is not particularly limited, and examples include heating the sheet to be stretched with hot air or a heater. The heating temperature of the sheet to be stretched in the second stretching is preferably (Y1-80)°C or higher and (Y1-10)°C or lower, and more preferably (Y1-70)°C or higher and (Y1-40)°C or lower, where Y1 (°C) is the melting point of the thermoplastic resin used as the raw material. If the sheet to be stretched contains multiple types of thermoplastic resins, the melting point of the thermoplastic resin with the highest melting point among those multiple types of thermoplastic resins is set as Y1. 【0092】 The stretching ratio in the second stretching is preferably 1.2 times or more, more preferably 1.5 times or more, and even more preferably 2 times or more, from the viewpoint of making the thickness and basis weight after stretching as uniform as possible. Furthermore, from the viewpoint of preventing unintended tearing after stretching, the stretching ratio is preferably 9 times or less, more preferably 7 times or less, and even more preferably 5 times or less. By setting the stretching ratio in the second stretching to the above-mentioned specific range, it becomes easier to obtain a film sheet in which the void occupancy rate is within the above-mentioned specific range. 【0093】 The stretching speed of the sheet to be stretched in the second stretching is preferably 10 mm / second or more and 10 m / second or less, more preferably 50 mm / second or more and 5 m / second or less. By setting the stretching speed in the second stretching to the above specific range, it becomes easier to obtain a film sheet with a low degree of orientation. 【0094】 Although the present invention has been described above based on its preferred embodiments, the present invention is not limited in any way to the above embodiments and can be modified as appropriate without departing from the spirit of the invention. 【0095】The present invention will be described in more detail below with reference to examples, but the present invention is not limited to such examples. 【0096】 [Examples 1-21 and Comparative Example 1: Production of Film Sheets] Resin compositions A-V, with compositions shown in Tables 1 and 2 below, were produced as thermoplastic resins other than acrylic polymers. Specifically, resin compositions A-V were produced by heating and kneading raw materials containing thermoplastic resin and inorganic particles using a twin-screw extruder. Next, resin compositions A-V were molded into sheets using a T-die extrusion molding apparatus to obtain molded bodies, and these molded bodies were cooled to produce unstretched sheets. Next, the unstretched sheets were subjected to a first stretch in one direction, and then a second stretch in a direction perpendicular to the first stretch to produce the target film sheet. In the first stretch, the stretching ratio was as shown in Tables 3 and 4 below, the heating temperature was 120°C, and the stretching speed was 300 mm / second. In the second stretch, the stretching ratio was as shown in Table 3 below, the heating temperature was 120°C, and the stretching speed was 50 mm / second. Details of the raw materials used in the production of the film sheets are as follows. Beta-nucleating agents and fluorine-containing compounds were not used. 【0097】 Thermoplastic resin a: Homo PP (melting point: 160°C, MFR: 0.5 g / min, density: 0.9 g / cm³) ３ ), "EA9" manufactured by Nippon Polypropylene Co., Ltd. ・Thermoplastic resin bB: Homo PP (melting point: 160℃, MFR: 24 g / min, density: 0.9 g / cm³) ３ ), manufactured by Nippon Polypropylene Co., Ltd. "FY6" - Thermoplastic resin c: Homo PP (melting point: 160℃, MFR: 11 g / min, density: 0.9 g / cm³) ３ ), "MA3" manufactured by Nippon Polypropylene Co., Ltd. ・Thermoplastic resin d: Random PP (propylene-ethylene random copolymer, melting point: 140℃, MFR: 2.4 g / min, density: 0.9 g / cm³) ３ ), Prime Polymer Co., Ltd.'s "E-330GV" - Thermoplastic resin e: LLDPE (melting point: 120℃, MFR: 2.4 g / min, density: 0.9 g / cm³) ３), "Ultrasex 2520F" manufactured by Nippon Polypropylene Co., Ltd. ・Thermoplastic resin f: Random PP (propylene-ethylene random copolymer, melting point: 140℃, MFR: 6.2 g / min, density: 0.9 g / cm³) ３ ), Prime Polymer Co., Ltd.'s "F730NV" - Thermoplastic resin g: Ethylene-1-butene copolymer (melting point 44℃, MFR: 4g / min, density: 0.864g / cm³) ３ ), non-commercial product (manufactured using metallocene catalyst) ・Thermoplastic resin h: LLDPE (melting point: 116℃, MFR: 5.5 g / min, density: 0.924 g / cm³) ３ ), non-commercial product (manufactured using a metallocene catalyst) ・Thermoplastic resin i: Polyethylene (molecular weight: 1.15 million g / mol), "Hyzex Million 145M" manufactured by Mitsui Chemicals, Inc. 【0098】 All inorganic particles used were not coated with other substances. • Inorganic particle j: Zinc oxide (average particle size 25 nm), manufactured by Teika Co., Ltd. "MZY-510M3S" • Inorganic particle k: Calcium carbonate (average particle size 0.15 μm), manufactured by Shiraishi Kogyo Co., Ltd. "Brillant-1500" • Inorganic particle l: Calcium carbonate (average particle size 1.8 μm), manufactured by Sankyo Seifun Co., Ltd. "Escalon 2000" • Inorganic particle m: Heavy calcium carbonate (average particle size 1.8 μm), manufactured by Toyo Fine Chemical Co., Ltd. "Whiteon P30" • Inorganic particle n: Aluminosilicate (average particle size 0.8 μm), manufactured by Mizusawa Chemical Industry Co., Ltd. "Mizukasieves Y-500" • Inorganic particle o: Aluminosilicate (average particle size 4 μm), manufactured by Mizusawa Chemical Industry Co., Ltd. "Mizukanight HP" 【0099】• Acrylic polymer: Alkyl methacrylate / alkyl acrylate copolymer, "Metablen P-1050" manufactured by Mitsubishi Chemical Corporation • Silicone oil: Methylpolysiloxane, "KF96-1000CS" manufactured by Shin-Etsu Chemical Co., Ltd. • Hydrocarbon oil p: A mixture of polyester obtained from a polybasic acid and a polyhydric alcohol, and polyester obtained from a monobasic acid with 14 to 22 carbon atoms and a monohydric alcohol with 12 to 22 carbon atoms • Hydrocarbon oil q: Stearic acid, "Lunaq S70V" manufactured by Kao Corporation • Hydrocarbon oil r: Palm oil (extremely hydrogenated triglyceride. Of the constituent fatty acids, 1% by mass is saturated fatty acid with 14 carbon atoms, 42% by mass is saturated fatty acid with 16 carbon atoms, 57% by mass is saturated fatty acid with 18 carbon atoms, and it does not contain fatty acids with unsaturated bonds or hydroxyl groups.) • Hydrocarbon oil s: Zinc stearate, "Zinc stearate" manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. 【0100】[Evaluation Test] The following evaluation items were evaluated for each example and comparative example film sheet using the method described above. The results are shown in sections 3 and 4 below. For the film sheets of Examples 1 to 4 and 18, the 5000x observation field of view of one surface of the film sheet is shown in Figures 2 and 7 to 10. Figure 2 is Example 1, Figure 7 is Example 2, Figure 8 is Example 3, Figure 9 is Example 4, and Figure 10 is Example 18. In all examples and comparative examples, the film sheet had only the specified through holes. (Evaluation items) ・Resin occupancy rate (%) ・Presence or absence of exposed inorganic particles at the periphery of the void ・Presence or absence of network structure ・Presence or absence of fibrous parts ・Presence or absence of non-fibrous parts ・Ratio of length to width in the direction of extension of the elongated part of the fibrous part (referred to as "length / width of the elongated part" in Tables 3 and 4 below) ・Ratio of the maximum and minimum extension length of the non-fibrous part in the 5000x observation field (referred to as "maximum extension length / minimum extension length of the part where no fibrous part exists" in Tables 3 and 4 below) ・Ratio of inorganic particle diameter / fiber width ("Inorganic particle diameter" corresponds to "particle diameter of inorganic particles on the fibrous part (μm)" in Tables 3 and 4 below. "Fiber width" corresponds to "width of the fibrous part (μm)" in Tables 3 and 4 below. The former / latter is the ratio of inorganic particle diameter / fiber width.) ・Degree of orientation of the fibrous part (referred to as "degree of orientation" in Tables 3 and 4 below) - Whether there is an overlap between the surface voids and the internal fibrous portion in the 5000x observation field (referred to as "overlap of voids / fibrous portion" in Tables 3 and 4 below) - Whether there is an overlap between the surface voids and the internal non-fibrous portion in the 5000x observation field (referred to as "overlap of voids / non-fibrous portion" in Tables 3 and 4 below) - Presence or absence of fusion points and entanglement points - Length of the voids in the long axis direction / length of the voids in the short axis direction - Air permeability (seconds / 100 mL) - Water vapor permeability (g / m ２ • 24h) • Water pressure resistance (mmAq) • Thickness (μm) • Basis weight (g / m²) ２ ) 【0101】 【0102】 【0103】 【0104】 【0105】 For a film sheet to have excellent waterproofing properties, a high water pressure resistance value is desirable. As shown in Tables 3 and 4, the film sheets of each example have exposed inorganic particles at the periphery of the voids. Therefore, it can be seen that the film sheets of each example have a water pressure resistance of 20,000 mmAq or more and are more waterproof than Comparative Example 1, which does not have exposed inorganic particles at the periphery. 【0106】 According to the present invention, a film sheet with high water pressure resistance and excellent waterproofing properties is provided.

Claims

1. A film sheet comprising a thermoplastic resin other than an acrylic polymer and a plurality of inorganic particles, wherein the thermoplastic resin has a fibrous portion and a non-fibrous portion, and among the plurality of inorganic particles, exposed inorganic particles having a portion exposed from the thermoplastic resin are present at the periphery of a plurality of voids where the thermoplastic resin is absent.

2. The film sheet according to claim 1, wherein the fibrous portion extends in one direction and the maximum width in the direction perpendicular to the direction of extension is shorter than the length in the direction of extension.

3. The film sheet according to claim 1 or 2, wherein the width of the fibrous portion is 0.001 μm or more and 10 μm or less.

4. The film sheet according to any one of claims 1 to 3, wherein the fibrous portion has an elongated portion, and the ratio of the length to the width in the extending direction of the elongated portion is 0.5 or more and 50 or less as length / width.

5. The non-fibrous portion is the portion in which, in an observation field obtained by magnifying the surface of the film sheet 5,000 times with a scanning electron microscope, the ratio of the maximum extension length to the minimum extension length is 0.3 or more and 3 or less as maximum extension length / minimum extension length, according to any one of claims 1 to 4.

6. The film sheet according to any one of claims 1 to 5, wherein the inorganic particles are functional, and in an observation field obtained by magnifying the surface of the film sheet 5,000 times with a scanning electron microscope, the resin occupancy rate, which is the ratio of the total area of ​​the thermoplastic resin to the area of ​​the observation field, is greater than 0% and less than or equal to 80%.

7. The film sheet according to claim 6, wherein the function includes a deodorizing function.

8. The film sheet according to any one of claims 1 to 7, wherein the plurality of voids are scattered on the surface and inside the film sheet, the thermoplastic resin has a network structure, and the network structure is continuous in both the surface direction and the thickness direction of the film sheet while the thermoplastic resin surrounds the plurality of voids.

9. The film sheet according to claim 8, wherein the network structure has a plurality of fibrous portions, the width of the fibrous portions is 0.001 μm or more and 10 μm or less, the plurality of inorganic particles include unexposed inorganic particles, and the air permeability of the film sheet is 0 seconds / 100 mL or more and 20,000 seconds / 100 mL or less.

10. The film sheet according to any one of claims 1 to 9, wherein, in an observation field obtained by magnifying the surface of the film sheet 5,000 times with a scanning electron microscope, the degree of orientation of the plurality of fibrous portions, as measured by the following method, is 0.3 or more and 3 or less. <Method for measuring the degree of orientation of fibrous portions> In the image corresponding to the observation field, a square with a side length of 15 μm is created such that one side of the square coincides with the machine direction during the manufacture of the film sheet to be measured or a direction perpendicular to the machine direction. The number of fibrous portions that cross both of the upper and lower sides of the square is defined as the upper and lower fiber number, and the number of fibrous portions that cross both of the left and right sides of the square is defined as the left and right fiber number. The ratio of the left and right fiber number to the upper and lower fiber number is calculated, and this ratio is defined as the degree of orientation of the fibrous portions of the film sheet to be measured.

11. A film sheet according to any one of claims 1 to 10, wherein the fibrous portions do not have fusion points or entanglement points.

12. The film sheet according to any one of claims 1 to 11, wherein, when focusing on a single fibrous portion, the film sheet has portions in which the ratio of the particle diameter of inorganic particles resting on the fibrous portion to the width in the direction perpendicular to the extension direction of the fibrous portion (ratio of inorganic particle diameter / fiber width) is 0.01 or more and 1000 or less.

13. The film sheet according to any one of claims 1 to 12, wherein, when focusing on a single fibrous portion, the portion has a width in a direction perpendicular to the extension direction of the fibrous portion that is smaller than the particle diameter of the inorganic particles.

14. The film sheet according to any one of claims 1 to 13, wherein, in the observation field obtained by magnifying the surface of the film sheet 5,000 times with a scanning electron microscope, at least a portion of the plurality of voids has a ratio of the length in the long axis direction to the length in the short axis direction of the void, which is 0.3 or more and 3 or less as the length in the long axis direction / the length in the short axis direction.

15. The film sheet according to any one of claims 1 to 14, wherein, in an observation field obtained by magnifying the surface of the film sheet 5,000 times with a scanning electron microscope, the voids located on the surface of the film sheet and the fibrous portions located inside the film sheet overlap in the thickness direction of the film sheet.

16. The film sheet according to any one of claims 1 to 15, wherein, in an observation field obtained by magnifying the surface of the film sheet 5,000 times with a scanning electron microscope, the voids located on the surface of the film sheet and the non-fibrous portions located inside the film sheet overlap in the thickness direction of the film sheet.

17. The film sheet according to any one of claims 1 to 16, wherein the thermoplastic resin contains a polyolefin resin, and the content of the polyolefin resin in the thermoplastic resin is 90% by mass or more and 100% by mass or less with respect to the total mass of the thermoplastic resin.

18. The film sheet according to any one of claims 1 to 17, wherein the content of the plurality of inorganic particles in the film sheet is 30% by mass or more and 50% by mass or less with respect to the total mass of the film sheet.

19. The film sheet according to any one of claims 1 to 18, wherein the plurality of inorganic particles comprises one or more selected from zinc oxide, calcium carbonate, aluminosilicate, and titanium oxide.

20. The film sheet according to any one of claims 1 to 19, wherein the inorganic particles themselves are not covered with any other substance.

21. The film sheet according to any one of claims 1 to 20, wherein the exposed surface of the exposed inorganic particles is configured to adsorb or react with odor components of gas present inside the void when the film sheet is used, thereby the film sheet exhibits a deodorizing effect against the gas, and the exposed inorganic particles are one or more selected from the group consisting of activated carbon, metal carbonate, metal oxide, aluminosilicate, diatomaceous earth, and silica, the metal carbonate includes zinc oxide, and the metal oxide includes titanium oxide.

22. A film sheet according to any one of claims 1 to 21, further containing an acrylic polymer.

23. The film sheet according to claim 22, wherein the acrylic polymer comprises an alkyl methacrylate / alkyl acrylate copolymer.

24. A film sheet according to any one of claims 1 to 23, further comprising one or more selected from silicone oil and hydrocarbon oil, wherein the silicone oil comprises methylpolysiloxane, and the hydrocarbon oil comprises polyester and / or stearate, and the polyester comprises one or more selected from the group consisting of those obtained from a polybasic acid and a polyhydric alcohol, and those obtained from a monobasic acid having 14 to 22 carbon atoms and a monohydric alcohol having 12 to 22 carbon atoms.

25. The film sheet according to claim 24, wherein the total content of the silicone oil and the hydrocarbon oil is 1% by mass or more and 20% by mass or less based on the total mass of the film sheet.

26. The film sheet according to any one of claims 1 to 25, wherein the content of the β-nucleating agent in the film sheet is 0% by mass or more and 1.0% by mass or less with respect to the total mass of the film sheet.

27. The film sheet according to any one of claims 1 to 26, wherein the content of the fluorine-containing compound in the film sheet is 0% by mass or more and 1.0% by mass or less with respect to the total mass of the film sheet.

28. The film sheet according to any one of claims 1 to 27, wherein the air permeability of the film sheet is 0 seconds / 100 mL or more and 20,000 seconds / 100 mL or less.

29. The film sheet according to any one of claims 1 to 28, wherein the air permeability of the film sheet is 10 seconds / 100 mL or more and 3000 seconds / 100 mL or less.

30. The moisture permeability of the aforementioned film sheet is 2000 g / m². ２ ・15000g / m for 24 hours or more ２ - A film sheet according to any one of claims 1 to 29, wherein the film is 24 hours or less.

31. The moisture permeability of the film sheet is 2000 g / m². ２ ・20000g / m for 24 hours or more ２ - A film sheet according to any one of claims 1 to 30, wherein the duration is 24 hours or less.

32. The moisture permeability of the film sheet is 2000 g / m². ２ ・15000g / m for 24 hours or more ２ - A film sheet according to any one of claims 1 to 31, wherein the duration is 24 hours or less.

33. The film sheet according to any one of claims 1 to 32, wherein the water pressure resistance of the film sheet is 10,000 mmAq or more and 100,000 mmAq or less.

34. The film sheet according to any one of claims 1 to 33, wherein the through holes penetrating the film sheet in the thickness direction are only those through holes whose maximum span in a plan view is greater than 0 μm and less than or equal to 100 μm.

35. The film sheet according to any one of claims 1 to 34, wherein the thickness of the film sheet under a load of 0.8 kPa is greater than 0 μm and less than or equal to 100 μm.

36. A film sheet according to any one of claims 1 to 35, which is a sheet for moisture permeability, clothing, heat shielding, or agricultural use.

37. The film sheet according to any one of claims 1 to 36, wherein the film sheet is a single sheet.

38. A sheet article having a laminated structure of a film sheet according to any one of claims 1 to 37 and another sheet other than the film sheet, wherein the other sheet is arranged on one side of the film sheet, the other side of the film sheet is exposed, and the other sheet is a woven fabric.

39. A wearable article comprising a film sheet, wherein the film sheet comprises a thermoplastic resin and a plurality of inorganic particles, wherein a plurality of voids in the film sheet where the thermoplastic resin is absent extend through the thermoplastic resin, and exposed inorganic particles, among the plurality of inorganic particles, having portions exposed from the thermoplastic resin, are present at the periphery of the plurality of voids, and the wearable article is selected from the group consisting of clothing, shoes, hats and articles used to absorb bodily fluids discharged from the human body.

40. A method for manufacturing a film sheet, comprising: a thermoplastic resin other than an acrylic polymer and a plurality of inorganic particles, wherein the thermoplastic resin has a fibrous portion and a non-fibrous portion, and among the plurality of inorganic particles, exposed inorganic particles having a portion exposed from the thermoplastic resin are present at the periphery of a plurality of voids where the thermoplastic resin is absent, the method comprising: first stretching an unstretched sheet containing a thermoplastic resin other than an acrylic polymer and a plurality of inorganic particles in one direction, and then second stretching it in a direction intersecting the first direction.

41. A method for manufacturing a film sheet according to any one of claims 1 to 37, comprising the step of applying a first stretch in one direction to an unstretched sheet containing a thermoplastic resin and a plurality of inorganic particles, and then applying a second stretch in a direction intersecting the first direction.

42. The method for manufacturing a film sheet according to claim 40 or 41, wherein the stretching ratio in the first stretching and the stretching ratio in the second stretching are each 1.2 times or more and 9 times or less.

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