Sheet to be stuck to body

Abstract

To provide a sheet to be stuck to a body capable of preferably keeping a state in which the sheet to be stuck to a body is being stuck to a body of a user.SOLUTION: A sheet 100 to be stuck to a body is stuck to a body of a user, a contour line of the sheet 100 to be stuck to a body includes at least three arc-shaped parts 51 which are salient outward. The respective arc-shaped parts 51 are mutually coupled through salient and arc-shaped corner parts 61 which are salient outward, and each arc-shaped part 51 is longer than each corner part 61, and a part including an end 51a of the arc-shaped part 51 and an end 61a of the corner part 61 adjacent to the arc-shaped part 51 is an arc-shape which is salient outward. A whole shape of the sheet 100 to be stuck to a body is configured such that a dimension in a first direction where a whole length is maximum is longer than a dimension in a second direction which is orthogonal to the first direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a body adhesive sheet. [Background technology]

[0002] An example of a body adhesive sheet that is used by being attached to the body is described in Patent Document 1. The outer contour of the body adhesive sheet of Patent Document 1 (described in the document as a transdermal therapeutic preparation) includes at least two arc-shaped portions that each protrude inward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2001-506150 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the investigations of the present inventors, there is room for improvement in the structure of the body adhesive sheet described in Patent Document 1, which maintains the state in which the body adhesive sheet is attached to the body.

[0005] The present invention relates to a body adhesive sheet having a structure that enables the body adhesive sheet to be well maintained in a state where it is attached to the body. [Means for solving the problem]

[0006] The present invention relates to a body application sheet that is applied to the body, wherein the outer contour of the body application sheet includes at least three arc-shaped portions that are each convex outward, and each arc-shaped portion is connected to another through an arc-shaped corner that is convex outward, and each arc-shaped portion is longer than each corner, and the portion that includes the end of an arc-shaped portion and the end of the corner adjacent to the arc-shaped portion forms an arc that is convex outward, and the overall shape of the body application sheet is such that the dimension in a first direction in which the total length is greatest is longer than the dimension in a second direction that is perpendicular to the first direction. [Effects of the Invention]

[0007] According to the present invention, it is possible to maintain the state in which the body adhesive sheet is attached to the body in a good condition. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a plan view of a body adhesive sheet according to an embodiment. [Figure 2] FIG. 2 is a partial enlarged view of part A shown in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line BB shown in FIG. [Figure 4] FIG. 2 is a rear view of the body adhesive sheet according to the embodiment. [Figure 5] 1 is a plan view showing a state in which a body application sheet according to an embodiment is stretched in a first direction. [Figure 6] FIG. 1 is a cross-sectional view of a body adhesive sheet according to a first modified example of the embodiment. [Figure 7] FIG. 10 is a rear view of a body adhesive sheet according to a first modified example of the embodiment. [Figure 8] FIG. 10 is a partially enlarged view of a body adhesive sheet according to a second modified example of the embodiment. [Figure 9] FIG. 10 is a plan view of a body adhesive sheet according to a third modified example of the embodiment. [Figure 10] FIG. 10(a) is a plan view of a body adhesive sheet according to Comparative Example 1, and FIG. 10(b) is a plan view of a body adhesive sheet according to Modification Example 2. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are designated by the same reference numerals, and redundant explanations will be omitted where appropriate.

[0010] The body application sheet 100 according to this embodiment is used by applying it to the body. The overall shape of the body application sheet 100 is such that the dimension in a first direction, in which the overall length is greatest, is longer than the dimension in a second direction perpendicular to the first direction. In other words, the dimension of the body application sheet 100 in the first direction is the maximum dimension of the body application sheet 100. 1 and 2, the outline of the body application sheet 100 includes at least three arc-shaped portions 51, each of which convex outward. The arc-shaped portions 51 are connected to one another via arc-shaped corners 61 that convex outward. Each arc-shaped portion 51 is longer than each corner 61, and the portion including the end 51a of one arc-shaped portion 51 and the end 61a of the corner 61 adjacent to that arc-shaped portion 51 forms an arc-shaped portion that convex outward. Here, "each arc-shaped portion 51 is longer than each corner 61" means that the length dimension of the arc-shaped portion 51 in the path length is greater than the length dimension of the corner 61 in the path length. 3 is a partially enlarged view of a part of the cross section taken along line BB in FIG.

[0011] The body adhesive sheet 100 is used by being attached to the skin surface of a desired part of the body. The skin surface is, for example, a curved surface with irregularities, and deforms (expands and contracts, etc.) in accordance with the contraction and expansion of muscles and the bending of joints, etc. When the body adhesive sheet 100 is attached to the skin surface, the body adhesive sheet 100 expands and contracts and curves in accordance with the irregularities and deformation of the skin surface.

[0012] According to this embodiment, the contour of the body application sheet 100 includes at least three arc-shaped portions 51, each of which convex outward. This increases the path length of the arc-shaped portions 51 compared to when the arc-shaped portions 51 are formed linearly, allowing each arc-shaped portion 51 to easily stretch in the plane direction of the body application sheet 100 and deform in response to the unevenness and expansion of the skin surface. More specifically, for example, as shown in FIG. 5 , when the body application sheet 100 stretches in a direction in which the distance between both ends of the arc-shaped portions 51 increases, the arc-shaped portions 51 deform into a shape close to a straight line, allowing them to sufficiently stretch in that direction. This improves the fit of the body application sheet 100 to the skin surface. Furthermore, in this embodiment, as described above, the arc-shaped portions 51 are connected to each other via arc-shaped corners 61 that convex outward, and the portion including the end 51a of the arc-shaped portion 51 and the end 61a of the corner 61 adjacent to the arc-shaped portion 51 forms an arc-shaped portion that convex outward. That is, as shown in FIGS. 1 and 2, each arc-shaped portion 51 and the corner 61 adjacent to the arc-shaped portion 51 are smoothly connected to each other. In other words, the tangent direction at the end of the arc-shaped portion 51 (the end of the end 51a) and the tangent direction at the end of the corner 61 connected to the end (the end of the end 61a) are consistent with each other. Therefore, the overall outline of the body application sheet 100, including the arc-shaped portion 51 and the corner 61 adjacent to the arc-shaped portion 51, does not have any inwardly convex portions. This results in a structure in which, when the body application sheet 100 is applied to the skin surface, each arc-shaped portion 51 is less likely to deform into a shape that is convex inward relative to the corners 61 adjacent to the arc-shaped portion 51. In other words, the structure makes it easier for the arc-shaped portions 51 to maintain a state in which they protrude outward relative to the corners 61. This prevents stress (tension) from concentrating on each corner 61, allowing the body application sheet 100 to maintain a good fit against the skin surface. Furthermore, the entire portion including the arc-shaped portion 51 and the corners 61 adjacent to the arc-shaped portion 51 has a shape that does not have any inwardly protruding portions, which prevents stress from concentrating locally in one part of the entire portion. In other words, when the body application sheet 100 is applied to the skin, the entire arc-shaped portion 51 and the corners 61 adjacent to the arc-shaped portion 51 can support a tensile load in a balanced manner. This allows the body application sheet 100 to better maintain a fit against the skin. As described above, according to this embodiment, it is possible to maintain the state in which the body application sheet 100 is applied to the body in a good condition.

[0013] In this embodiment, the radii of curvature of the arc-shaped portions 51 adjacent to each other across a corner 61 are different from each other. This allows each arc-shaped portion 51 to be set to the desired extensibility (extensibility until the arc-shaped portion 51 is deformed into a linear shape). Furthermore, in this embodiment, the lengths of the arc-shaped portions 51 adjacent to each other across a corner 61 are different from each other, and the radius of curvature of the shorter arc-shaped portion 51 is smaller than the radius of curvature of the longer arc-shaped portion 51. This allows the path length of the shorter arc-shaped portion 51 to be sufficiently long compared to when the arc-shaped portion 51 is formed linearly. For example, if the radius of curvature of the arc-shaped portion 51 varies in the longitudinal direction of the arc-shaped portion 51 (if the radius of curvature is not constant over the entire length in the longitudinal direction), the index of the radius of curvature is the average of the radii of curvature at each point in the longitudinal direction. For example, if the radius of curvature of the arc-shaped portion 51 varies in the longitudinal direction, the average of the radii of curvature at each point in the longitudinal direction of the shorter arc-shaped portion 51 is smaller than the average of the radii of curvature at each point in the longitudinal direction of the longer arc-shaped portion 51.

[0014] However, the present invention is not limited to the above example, and it is also preferable that the radii of curvature of the arc-shaped portions 51 are equal to each other. More preferably, the radii of curvature of the arc-shaped portions 51 adjacent to each other with a corner 61 interposed therebetween are equal to each other. This prevents the arc-shaped portions 51 from deforming into a convex shape facing inward, regardless of the direction in which the body application sheet 100 is used, thereby improving the operability when applying the body application sheet 100. Furthermore, since the radius of curvature of the arc-shaped portion 51 connected to one end of each corner 61 is equal to the radius of curvature of the arc-shaped portion 51 connected to the other end of the corner 61, when the body application sheet 100 is deformed to follow the unevenness and stretching of the skin surface, it can support tensile loads in a balanced manner across the entire area of ​​the corner 61. In addition, when the radius of curvature of the arc-shaped portion 51 varies in the longitudinal direction, it is preferable that the average radii of curvature at each point in the longitudinal direction of the arc-shaped portion 51 are equal to each other.

[0015] In this embodiment, the radius of curvature of each arc-shaped portion 51 is larger than the radius of curvature of each corner portion 61 . This makes it possible to more reliably prevent stress from concentrating on each corner 61. If the radius of curvature of the corner 61 varies in the longitudinal direction (if the radius of curvature is not constant over the entire longitudinal direction), the index of the radius of curvature is the average of the radii of curvature at each point in the longitudinal direction, as with the arc-shaped portion 51. For example, if the radii of curvature of the arc-shaped portion 51 and the corner 61 vary in the longitudinal direction, the average of the radii of curvature at each point in the longitudinal direction of the arc-shaped portion 51 is greater than the average of the radii of curvature at each point in the longitudinal direction of the corner 61.

[0016] In the following, when explaining the positional relationship between the components of the body application sheet 100, the upper side in FIG. 3 will be referred to as the upper side or upper portion, and the opposite side will be referred to as the lower side or lower portion.

[0017] The sheet 100 for application to the body is, for example, a cataplasm, a carbonated sheet, a cooling sheet, a wound covering sheet, or a heating sheet which will be explained in a modified example of the embodiment.

[0018] 1, the outline of the body application sheet 100 includes four arc-shaped portions 51 and four corners 61. More specifically, in a plan view, the outline of the body application sheet 100 is formed, for example, in the shape of a substantially rectangular shape with rounded corners that is elongated in one direction. The four arc-shaped portions 51 respectively constitute the four sides of the substantially rectangular shape, and the four corners 61 respectively constitute the four corners of the substantially rectangular shape. The four arc-shaped portions 51 consist of a first pair of arc-shaped portions 52, 53 facing each other and a second pair of arc-shaped portions 54, 55 facing each other. The four corner portions 61 consist of a first corner portion 62, a second corner portion 63, a third corner portion 64, and a fourth corner portion 65. One arc-shaped portion 52 of the first pair of arc-shaped portions 52, 53 and one arc-shaped portion 54 of the second pair of arc-shaped portions 54, 55 are connected to each other via a first corner 62. Similarly, one arc-shaped portion 52 of the first pair of arc-shaped portions 52, 53 and the other arc-shaped portion 55 of the second pair of arc-shaped portions 54, 55 are connected to each other via a second corner 63, the other arc-shaped portion 53 of the first pair of arc-shaped portions 52, 53 and one arc-shaped portion 54 of the second pair of arc-shaped portions 54, 55 are connected to each other via a third corner 64, and the other arc-shaped portion 53 of the first pair of arc-shaped portions 52, 53 and the other arc-shaped portion 55 of the second pair of arc-shaped portions 54, 55 are connected to each other via a fourth corner 65. The end 51a of each arc-shaped portion 51 and the end 61a of each corner portion 61 adjacent to that arc-shaped portion 51 are directly connected to each other. That is, in the present embodiment, the outline of the body application sheet 100 is made up of four arc-shaped portions 51 and four corners 61, and the entire shape has no inwardly protruding portions. Therefore, when the body application sheet 100 is attached to the skin, it is possible to prevent stress from concentrating on each of the four corners 61. Furthermore, regardless of the direction in which the body application sheet 100 stretches, the entire outline of the body application sheet 100 can support a tensile load in a balanced manner.

[0019] As shown in FIGS. 1 and 4, the length of each of the first pair of arcuate portions 52, 53 is greater than the length of each of the second pair of arcuate portions 54, 55. Here, in this embodiment, the first direction in which the total length is longest is the direction in which the second pair of arc-shaped portions 54, 55 face each other, and the second direction perpendicular to the first direction is the direction in which the first pair of arc-shaped portions 52, 53 face each other. In this embodiment, the overall shape of the body application sheet 100 is such that the dimension in a first direction is longer than the dimension in a second direction perpendicular to the first direction. This allows the body application sheet 100 to conform well to the curved skin surface, and allows the body application sheet 100 to fit well against the skin surface. Furthermore, since the outline of the body application sheet 100 is approximately rectangular, it is possible to improve the workability when applying the body application sheet 100 to the skin surface of areas such as the wrist or calf by wrapping around those areas. 5 also shows, as an example, a state in which the body application sheet 100 is stretched in a first direction (the direction of the arrow shown in FIG. 5). In addition, in FIG. 5, the state before the body application sheet 100 is stretched in the first direction (the state shown in FIG. 1) is shown by a two-dot chain line. The method of applying the body adhesive sheet 100 is not particularly limited, but can be determined to fit the curves of the body, for example. More specifically, when applying the body adhesive sheet 100, it is preferable to apply it so that the first direction is aligned with the direction in which the body surface changes significantly due to movement at the area where it is applied. For example, when applying the body adhesive sheet 100 to the calf, it is preferable to align the first direction with the direction connecting the ankle and knee (the direction along the bone), and similarly, when applying it to the neck, it is preferable to align the first direction with the direction perpendicular to the spine.

[0020] Here, it is preferable that the radius of curvature of the arc-shaped portion 51 is constant over the entire area. This prevents stress from concentrating locally at the end 51a of the arc-shaped portion 51 when the body application sheet 100 is deformed to follow the unevenness and elongation of the skin surface. In other words, the entire arc-shaped portion 51 can support the tensile load in a balanced manner.

[0021] In this embodiment, each of the arc-shaped portions 51 (the first pair of arc-shaped portions 52, 53 and the second pair of arc-shaped portions 54, 55) has a constant radius of curvature over the entire area of ​​the arc-shaped portion 51. This prevents stress from concentrating locally at the end 51a of each arc-shaped portion 51 when the body application sheet 100 is deformed to follow the unevenness and elongation of the skin surface. In other words, the tensile load can be supported in a well-balanced manner across the entire arc-shaped portion 51. This makes it possible to more reliably maintain the body application sheet 100 in a state where it is well applied to the body.

[0022] However, it is also preferable that the radius of curvature of each arc-shaped portion 51 increases from one end 51a of the arc-shaped portion 51 toward the center 51b in the longitudinal direction (for example, in the direction of the arrow shown in Figure 2 for convenience). This configuration also prevents stress from concentrating locally at the ends 51a of the arc-shaped portions 51 when the body application sheet 100 is deformed in response to the unevenness and elongation of the skin surface. In other words, the entire arc-shaped portions 51 can support the tensile load in a balanced manner.

[0023] In the present invention, the radius of curvature does not necessarily have to be constant over the entire area of ​​all of the arc-shaped portions 51. That is, for example, the multiple arc-shaped portions 51 may include arc-shaped portions 51 whose radius of curvature is constant over the entire area of ​​the arc-shaped portions 51 and arc-shaped portions 51 whose radius of curvature varies in the longitudinal direction of the arc-shaped portions 51. In this way, the radius of curvature of each arcuate portion 51 can be set appropriately depending on the intended use of the body adhesive sheet 100 and the part of the body to be used.

[0024] It is also preferable that the radius of curvature of the corner 61 is constant over the entire area. By doing so, when the body adhesive sheet 100 is applied to the skin surface, the entire corners 61 can support the tensile load in a well-balanced manner. However, in the present invention, the radius of curvature of the corner 61 may, for example, increase continuously toward the arc-shaped portion 51 that connects to the corner 61. In this case, it is not necessary for the radius of curvature of the entire corner 61 to increase continuously toward the arc-shaped portion 51 that connects to the corner 61, but it is sufficient that the radius of curvature increases continuously toward the arc-shaped portion 51 that connects to the corner 61 at least in a portion of the corner 61 that is close to the arc-shaped portion 51. Note that the continuous increase in the radius of curvature may be monotonous and continuous. In this embodiment, the radius of curvature is constant over the entire area of ​​each corner 61 (in this embodiment, the first corner 62 to the fourth corner 65). However, in the present invention, the radius of curvature does not necessarily have to be constant over the entire area of ​​all corners 61. That is, for example, the multiple corners 61 may include corners 61 whose radius of curvature is constant over the entire area of ​​the corners 61 and corners 61 whose radius of curvature varies in the longitudinal direction of the corners 61. In this way, the radius of curvature of each corner 61 can be set appropriately depending on the intended use of the body adhesive sheet 100 and the part of the body on which it is used.

[0025] Furthermore, it is preferable that the first pair of arc-shaped portions 52, 53 have the same shape as each other, and that the second pair of arc-shaped portions 54, 55 have the same shape as each other. Here, "same shape" means that when one of the first pair of arc-shaped portions 52, 53 is rotated to overlap the other, their outlines match. Similarly, when one of the second pair of arc-shaped portions 54, 55 is rotated to overlap the other, their outlines match. More specifically, it is preferable that the radii of curvature of the first pair of arc-shaped portions 52, 53 are equal to each other, and the radii of curvature of the second pair of arc-shaped portions 54, 55 are equal to each other. By doing so, for example, when the body application sheet 100 is stretched in the first direction, it is possible to prevent stress from concentrating on one of the first pair of arc-shaped portions 52, 53. Similarly, for example, when the body application sheet 100 is stretched in the second direction, it is possible to prevent stress from concentrating on one of the second pair of arc-shaped portions 54, 55. Moreover, it is preferable that the first corner 62 to the fourth corner 65 also have the same shape as each other. By doing so, the tensile load can be supported in a balanced manner across all corners 61, regardless of the direction in which the body application sheet 100 is used. This improves the operability when applying the body application sheet 100. In this embodiment, the radius of curvature of the first pair of arc-shaped portions 52, 53 and the radius of curvature of the second pair of arc-shaped portions 54, 55 are different from each other, and the radius of curvature of the second pair of arc-shaped portions 54, 55 is smaller than the radius of curvature of the first pair of arc-shaped portions 52, 53. This ensures a sufficient path length for the second pair of arc-shaped portions 54, 55. However, the radius of curvature of the first pair of arcuate portions 52, 53 and the radius of curvature of the second pair of arcuate portions 54, 55 may be equal to each other.

[0026] As shown in FIGS. 1 and 2, each arc-shaped portion 51 is preferably formed in an arc shape that is most outwardly convex at a center 51b of the arc-shaped portion 51 in the longitudinal direction. By doing so, the center 51b of the arc-shaped portion 51, which is more likely to have an inwardly convex shape than other portions, is pre-formed to be the most outwardly convex, so that, for example, when the body application sheet 100 is deformed in response to the unevenness or extension of the skin surface, the center 51b in the longitudinal direction of each arc-shaped portion 51 can be prevented from deforming into an inwardly convex shape, thereby more reliably maintaining the body application sheet 100 in a state where it fits the skin surface.

[0027] The radius of curvature of the first pair of arc-shaped portions 52, 53 is not particularly limited, but is preferably, for example, 200 mm or more and 800 mm or less, and more preferably 400 mm or more and 600 mm or less. The radius of curvature of the second pair of arcuate portions 54, 55 is not particularly limited, but is preferably, for example, 100 mm or more and 500 mm or less, and more preferably 200 mm or more and 400 mm or less. The radius of curvature of each corner 61 is not particularly limited, but is preferably, for example, 5 mm or more and 30 mm or less, and more preferably 10 mm or more and 25 mm or less.

[0028] The sheet 100 for application to the body includes a substrate 10, an adhesive layer 20, and a release film 40, as shown in FIG. The adhesive layer 20 is formed, for example, along at least the peripheral edge of the sheet 100 to be applied to the body. More specifically, as shown in FIG. 4, in this embodiment, the adhesive layer 20 is formed along at least the periphery of one surface 10a of the substrate 10. This allows the body application sheet 100 to be applied to the body via the adhesive layer 20. Here, when the adhesive layer 20 is formed along the peripheral edge, it is preferable to form the adhesive layer 20 continuously. However, the adhesive layer 20 may be formed intermittently, and in this case, it is preferable to form the adhesive layer 20 intermittently at a fine pitch. By doing so, it is possible to prevent the body application sheet 100 from lifting or peeling off from the portion of one surface 10a where the adhesive layer 20 is not formed. In FIG. 4, the area on one surface 10a of the base material 10 where the adhesive layer 20 is formed is indicated by hatching that slopes upward to the left. In this embodiment, the adhesive layer 20 is formed on the entire surface of the body application sheet 100. That is, as shown in Fig. 4, the adhesive layer 20 is formed on the entire surface of one surface 10a of the substrate 10. This ensures a sufficient contact area of ​​the adhesive layer 20 with the skin surface. The body application sheet 100 is, for example, constructed by laminating three layers in this order: a substrate 10, an adhesive layer 20, and a release film 40. The outer shapes of the substrate 10, the adhesive layer 20, and the release film 40 are, for example, set to be approximately the same shape and size as each other. In this embodiment, the adhesive layer 20 is formed on the lower surface of the substrate 10 . The release film 40 is laminated on the lower surface side of the adhesive layer 20 so as to be releasable from the adhesive layer 20 . When using the body application sheet 100, the release film 40 is peeled off from the adhesive layer 20, exposing the adhesive layer 20 on the underside of the body application sheet 100. The body application sheet 100 is then applied to the body via the adhesive layer 20, with the adhesive layer 20 facing the skin side of the substrate 10 and adhesive layer 20.

[0029] In this embodiment, the adhesive layer 20 is, for example, a water-containing gel layer. The water-containing gel layer (adhesive layer 20) is not particularly limited, but preferably can retain a large amount of water and has appropriate elasticity and flexibility. In addition, the adhesive layer 20 (hydrogel layer) may contain, as appropriate, depending on the use of the body application sheet 100, for example, oily components, powdery components, water-soluble polymers, thickeners, coating agents, ultraviolet absorbers, swarf ion blocking agents, alcohols, sugars, amino acid derivatives, organic amines, resin emulsions, cooling agents, blood circulation promoters, skin nutrients, vitamins, antioxidants, antioxidant aids, preservatives, pigments, fragrances, etc.

[0030] The material constituting the substrate 10 is not particularly limited, but examples thereof include rayon, cotton, cupra, lyocell, hemp, wool, silk, acetate, cellulose, wood pulp, non-wood pulp, polyvinyl alcohol (PVA), polyethylene glycol, cellulose acetate, polyacrylamide, melamine resin, nylon, polyester, etc.

[0031] The material constituting the release film 40 is not particularly limited, but examples include polyester films such as polyethylene terephthalate film and polybutylene terephthalate film, polyolefin films such as polyethylene film and polypropylene film, and laminated paper in which paper such as kraft paper, glassine paper, and fine paper is laminated with plastic such as polyethylene.

[0032] The thickness of the substrate 10 is not particularly limited, but is preferably, for example, 0.1 mm or more and 1.5 mm or less, and more preferably 0.5 mm or more and 1.0 mm or less. By making the thickness of the substrate 10 0.5 mm or more, the structural strength of the sheet 100 to be applied to the body can be ensured sufficiently. By making the thickness of the substrate 10 1.0 mm or less, the stretchability of the sheet 100 to be applied to the body can be ensured sufficiently.

[0033] The thickness of the adhesive layer 20 (hydrogel layer) is not particularly limited, but is preferably, for example, 0.1 mm or more and 5.0 mm or less, and more preferably 0.5 mm or more and 3.0 mm or less. By making the thickness of the adhesive layer 20 0.5 mm or more, the above-mentioned components contained in the adhesive layer 20 can be applied sufficiently to the skin surface. By making the thickness of the adhesive layer 20 3.0 mm or less, the stretchability of the sheet 100 to be applied to the body can be sufficiently ensured. The thicknesses of the body adhesive sheet 100, the substrate 10, and the release film 40 can each be measured using a constant pressure thickness meter (manufactured by Techlock Co., Ltd., model PG-11, probe diameter: 30 mm). The thickness of the adhesive layer 20 can be determined by subtracting the thicknesses of the substrate 10 and the release film 40 from the thickness of the body adhesive sheet 100.

[0034] The thickness of the release film 40 is not particularly limited, but is preferably, for example, 0.03 mm or more and 0.20 mm or less, and more preferably 0.05 mm or more and 0.15 mm or less.

[0035] The adhesive layer 20 preferably has a ball number in the ball tack test specified in JIS Z0237 of 10 or more and 28 or less. Generally, the larger the ball number, the higher the tack strength. Generally, if the ball number of the adhesive layer 20 in the ball tack test is 10 or more, preferably 14 or more, and more preferably 18 or more, the adhesive layer 20 will adhere well to the skin surface when the body application sheet 100 is applied to the body. Generally, by setting the ball number of the adhesive layer 20 in a ball tack test to 28 or less, preferably 22 or less, and more preferably 16 or less, it is possible to prevent the adhesive layer 20 from sticking to the user's fingers or palm when applying the body application sheet 100. Furthermore, after using the body application sheet 100, the adhesive layer 20 can be smoothly peeled off from the skin surface. Thus, from the viewpoint of adhesion of the adhesive layer 20 to fingers etc. and peeling after use, a ball number of 16 or less in the ball tack test is more preferable, but from the viewpoint of adhesiveness, 18 or more is more preferable, and it was difficult to achieve a well-balanced design overall. On the other hand, as described above, in this embodiment, the outer contour of the body adhesive sheet 100 has a shape that does not have any inwardly protruding portions. Therefore, during use of the body adhesive sheet 100, even if the ball number of the adhesive layer 20 in the ball tack test is 16 or less, the body adhesive sheet 100 can maintain a good fit to the skin surface. That is, it is possible to improve both the ease of application and the ease of removal, and to maintain the state of the patch being applied to the body in a good condition.

[0036] Furthermore, it is preferable that the tensile strength of the substrate 10 when stretched 10% in the first direction is 3 N or less. The tensile strength of the substrate 10 when stretched 10% in the first direction is the magnitude of the tensile load required to stretch the substrate 10 by 10% in the first direction. Since the tensile strength of the substrate 10 at 10% elongation in the first direction is 3N or less, when the body application sheet 100 is attached to the skin surface, the substrate 10 can expand, contract, and bend in a manner that satisfies the unevenness and deformation of the skin surface. By ensuring that the tensile strength of the substrate 10 at 10% elongation in the first direction is 0.5 N or more, sufficient rigidity as a support for the adhesive layer 20 (hydrogel layer) can be ensured, and excellent operability can be obtained when applying the adhesive layer 20 to the skin surface. Therefore, the above-mentioned components contained in the adhesive layer 20 can be applied satisfactorily to the skin surface. However, it is also preferable that the tensile strength of the body application sheet 100 is 3N or less when stretched 10% in the first direction. With such a configuration, the above-mentioned effects can also be achieved. Note that, in the case where the body application sheet 100 includes a release film 40, the "tensile strength of the body application sheet 100" refers to the tensile strength of the portion excluding the release film 40 (the entire portion that is applied to the body).

[0037] The length dimension of the body application sheet 100 in the first direction is not particularly limited, but from the viewpoint of ensuring a sufficient contact area of ​​the adhesive layer 20 with the skin surface, it is preferably, for example, 30 mm or more and 200 mm or less, and more preferably 70 mm or more and 140 mm or less. Similarly, the length dimension of the body application sheet 100 in the second direction is not particularly limited, but from the viewpoint of ensuring a sufficient contact area of ​​the adhesive layer 20 with the skin surface, it is preferably, for example, 20 mm or more and 150 mm or less, and more preferably 40 mm or more and 100 mm or less.

[0038] <Variation 1> Next, a first modification of the embodiment will be described with reference to FIGS. The body application sheet 100 according to this modification differs from the body application sheet 100 according to the embodiment in the following respects, but is otherwise configured similarly to the body application sheet 100 according to the embodiment. Fig. 6 shows a partially enlarged cross-sectional view taken along a line corresponding to line BB in Fig. 1. The hatching of the adhesive layer 20 has been omitted to clearly show that the adhesive layer 20 is not formed in the area shown in Fig. 6. Furthermore, in Fig. 7, the area where the adhesive layer 20 is formed is indicated by hatching slanting upward to the left.

[0039] In this modification, the body application sheet 100 is a heating sheet. As shown in FIG. 6, the body application sheet 100 includes a substrate 10, an adhesive layer 20, and a heat generating element 30. In the above embodiment, an example was described in which the adhesive layer 20 was formed over the entire surface of one surface 10a of the substrate 10. However, in this modified example, as shown in FIG. 7, the adhesive layer 20 is selectively formed on the peripheral portion of one surface 30a of the heating element 30, and the central portion of the one surface 30a is an area where the adhesive layer 20 is not formed. Furthermore, in the above embodiment, an example was described in which the adhesive layer 20 was a hydrogel layer, but in the case of this modified example, the adhesive layer 20 is formed of an adhesive. In this modified example, the body application sheet 100 includes, as an example, a three-layer structure region formed by laminating three layers, namely, a substrate 10, a heating element 30, and an adhesive layer 20, in this order, and a two-layer structure region formed by laminating two layers, namely, the substrate 10 and the heating element 30, in this order. Furthermore, the central portion of one surface 30a (the lower surface of the heating element 30) of the heating element 30 is an area where the adhesive layer 20 is not formed (a two-layer structure area), so that the heat generated by the heating element 30 can be transmitted well to the skin surface.

[0040] The adhesive forming the adhesive layer 20 is not particularly limited, but examples thereof include an acrylic adhesive, a silicone adhesive, a urethane adhesive, a rubber adhesive, etc. The adhesive layer 20 may be configured to include two or more types of adhesives.

[0041] In this modification, the heat generating element 30 includes a sheet-shaped heat generating material (not shown). The heat generating material contains, for example, iron powder, water, and a water retaining layer.

[0042] In the present invention, the body adhesive sheet 100 may be enclosed in a packaging bag made of a soft packaging material.

[0043] <Variation 2> Next, a modification of the embodiment will be described with reference to FIG. The body application sheet 100 according to this modification differs from the body application sheet 100 according to the embodiment and modification 1 in the following respects, but is otherwise configured in the same manner as the body application sheet 100 according to the embodiment and modification 1. Note that Fig. 8 is an enlarged view of a portion corresponding to part A shown in Fig. 1.

[0044] In this modified example, the corner portion 61 includes a main portion 67 and a transition portion 68 interposed between the main portion 67 and the arc-shaped portion 51 adjacent to the corner portion 61 . The length of the transition portion 68 is shorter than the length of the main portion 67 , and the radius of curvature of the transition portion 68 is greater than the radius of curvature of the main portion 67 . The main portion 67 preferably has a constant radius of curvature. Similarly, the arcuate portion 51 adjacent to the corner 61 preferably has a constant radius of curvature. By doing this, the overall outline of the body application sheet 100, including the arc-shaped portions 51 and the corners 61 adjacent to the arc-shaped portions 51, does not have any inwardly protruding portions. Therefore, when the body application sheet 100 is attached to the skin, the entire arc-shaped portions 51 and corners 61 can support a tensile load in a balanced manner. However, in the present invention, the radius of curvature of the main portion 67 may, for example, increase continuously toward the transition portion 68. In this case, the radius of curvature does not necessarily have to increase continuously toward the transition portion 68 over the entire main portion 67, but it is sufficient that the radius of curvature increases continuously toward the transition portion 68 at least in a portion of the main portion 67 close to the transition portion 68. Similarly, the radius of curvature of the arc-shaped portion 51 adjacent to the corner 61 may, for example, continuously decrease toward the corner 61. In this case, it is not necessary for the radius of curvature of the entire arc-shaped portion 51 to continuously increase toward the transition portion 68, but it is sufficient that the radius of curvature continuously increases toward the corner 61 at least in the portion close to the corner 61. Furthermore, it is preferable that the radius of curvature of the transition portion 68 is constant. However, for example, the radius of curvature of the transition portion 68 may be larger than that of the main portion 67 and may continuously decrease toward the main portion 67 (the radius of curvature may continuously increase toward the arc-shaped portion 51). In this case, the radius of curvature does not necessarily have to continuously increase toward the main portion 67 over the entire transition portion 68, as long as the radius of curvature continuously increases toward the main portion 67 at least in the portion close to the main portion 67. The continuous increase (decrease) in the radius of curvature described above may be monotonous and continuous. In this way, the radius of curvature of each of the main portion 67 and the transition portion 68 can be set appropriately depending on the intended use of the body adhesive sheet 100 and the part of the body on which it is used.

[0045] Although the embodiments have been described above with reference to the drawings, these are merely examples of the present invention, and various other configurations can also be adopted.

[0046] For example, in the above description, the outline of the body application sheet 100 is formed into a generally rectangular shape in a plan view. However, the present invention is not limited to this example, and the outline of the body application sheet 100 may include at least three arc-shaped portions 51 and corners 61 connecting the arc-shaped portions 51 to each other. Therefore, for example, the outline of the body application sheet 100 may be formed into a shape in which four or more arc-shaped portions 51 are connected to each other via outwardly convex arc-shaped corners 61. That is, the outline of the body application sheet 100 may be an approximately polygonal shape having a shape of approximately pentagon or more. However, when the outline of the body application sheet 100 is an approximately polygonal shape, not all of the arc-shaped portions 51 necessarily have to be formed into an outwardly convex arc. That is, at least one or more arc-shaped portions may be formed into an inwardly convex arc, and the outline of the body application sheet 100 may include a straight portion. In FIG. 9, as an example, the outline of the body adhesive sheet 100 includes a straight portion 56 formed in a straight line instead of the other arcuate portion 55 of the second pair of arcuate portions 54, 55. In this way, the outline of the body adhesive sheet 100 may include areas other than the arc-shaped portions 51 and the corners 61 . [Example]

[0047] Examples 1 to 11 and Comparative Examples 1 to 6 will be explained below with reference to FIGS. 10(a), 10(b) and Tables 1 to 3. For Examples 1 to 11 and Comparative Examples 1 to 6, the body adhesive sheets 100 according to each Example and Comparative Example were subjected to a sensory evaluation by three evaluation experts on a 5-point scale from 1 to 5 for each of the following criteria: "fit," "skin irritation when peeling off," and "ease of application." The scores for the sensory evaluations shown in Tables 1 to 3 are the average scores of the three experts. More specifically, the "fit" was evaluated based on the ease with which the body adhesive sheet 100 floated. The body adhesive sheet 100 was applied to the center of the calf with the first direction being vertical, and after one minute, the ankle was subjected to ten dorsiflexion and plantar flexion exercises, and the state of float of the body adhesive sheet 100 was evaluated on a 5-point scale (5 points: very difficult to float, 4 points: difficult to float, 3 points: neither difficult nor difficult, 2 points: somewhat easy to float, 1 point: easy to float). "Skin irritation during removal" was evaluated based on the degree of tension felt when removing the body adhesive sheet 100. The body adhesive sheet 100 was applied to the center of the calf with the first direction being the vertical direction, and the body adhesive sheet 100 was removed 30 minutes later. The degree of tension felt was evaluated on a 5-point scale (5 points: no tension felt at all, 4 points: slight tension felt, 3 points: some tension felt, 2 points: tension felt, 1 point: strong tension felt). The "ease of application" was evaluated based on the ease of application of the body adhesive sheet 100. The release film 40 was peeled off, and the ease of application when applying the body adhesive sheet 100 to the center of the calf with the first direction being vertical was evaluated on a 5-point scale (5 points: very easy to apply, 4 points: somewhat easy to apply, 3 points: neither easy nor difficult, 2 points: somewhat difficult to apply, 1 point: difficult to apply). The overall evaluation of the body application sheet 100 was determined to be pass if each of the "fit," "skin irritation when peeling," and "ease of application" scores were not below 2.6 points, and the total of each score was 10 points or more. The body application sheet 100 of each example and each comparative example differs from the body application sheet 100 of the above-described embodiment in the points described below, but is otherwise configured in the same manner.

[0048] In Tables 1, 2, and 3, the second to fifth lines from the top show the shape, dimensions, and ball number (ball number according to the ball tack test specified in JIS Z0237) of each body application sheet 100. In addition, in Tables 1 to 3, the sixth to eighth lines from the top show the results of the sensory evaluation, of which the sixth line from the top shows the evaluation results for "fit," the seventh line from the top shows the evaluation results for "ease of removal," and the eighth line from the top shows the evaluation results for "operability when applying." Furthermore, in Tables 1, 2, and 3, "four sides rounded" means that the body application sheet 100, which is generally rectangular (or square) in plan view, includes four arc-shaped portions 51, and these four arc-shaped portions 51 constitute each of the four sides of the generally rectangular shape; "three sides rounded, one straight side" means that the body application sheet 100, which is generally rectangular in plan view, includes three arc-shaped portions 51 and a straight portion 56, and these three arc-shaped portions 51 constitute each of the three sides of the generally rectangular shape, and this straight portion 56 constitutes the remaining side; and "four straight sides" means that the body application sheet 100, which is generally rectangular in plan view, includes four straight portions 56, and these four straight portions 56 constitute each of the four sides of the generally rectangular shape.

[0049] First, Examples 1 to 4 and Comparative Example 1 will be explained using Table 1 and FIG. 10(a).

[0050] [Table 1]

[0051] The body application sheets 100 according to Examples 1 to 4 and Comparative Example 1 are configured similarly to one another in the points described below. The planar shape of the body application sheets 100 according to Examples 1 to 4 and Comparative Example 1 is a substantially rectangular shape with a dimension of 125 mm in the first direction and a dimension of 85 mm in the second direction (referred to as a first rectangular shape in Table 1). The radius of curvature of each corner 61 of each body application sheet 100 is 15 mm. An adhesive layer 20 is formed on the entire surface of each body application sheet 100, and its ball number is 18. On the other hand, the body application sheets 100 according to Examples 1 to 4 and Comparative Example 1 differ from each other in the points explained below. The body application sheet 100 according to Example 1 includes four arc-shaped portions 51, which respectively form the four sides of the generally rectangular shape. The radius of curvature of each of the first pair of arc-shaped portions 52, 53 (listed as "long" in Table 1) is 500 mm, and the radius of curvature of each of the second pair of arc-shaped portions 54, 55 (listed as "short" in Table 1) is 300 mm. The planar shape of the body application sheet 100 according to Example 1 is the same as the planar shape of the body application sheet 100 of the first embodiment shown in FIG. The body application sheet 100 according to Example 2 includes three arc-shaped portions 51 and a straight portion 56, as in Modification 3 shown in Fig. 9, and the three arc-shaped portions 51 respectively form three sides of the approximately rectangular shape, and the straight portion 56 forms the remaining side (short side). The three arc-shaped portions 51 each have the same radius of curvature of 500 mm. The body application sheet 100 according to Example 3 includes four arc-shaped portions 51, which respectively define the four sides of the approximately rectangular shape. The four arc-shaped portions 51 each have the same radius of curvature of 500 mm. The body adhesive sheet 100 according to Example 4 includes four arc-shaped portions 51, which respectively define the four sides of the generally rectangular shape. One of the first pair of arc-shaped portions 52, 53 (referred to as "long (1)" in Table 1) has a radius of curvature of 500 mm, and the other (referred to as "long (2)" in Table 1) has a radius of curvature of 300 mm. One of the second pair of arc-shaped portions 54, 55 (referred to as "short (1)" in Table 1) has a radius of curvature of 500 mm, and the other (referred to as "short (2)" in Table 1) has a radius of curvature of 300 mm. As shown in FIG. 10(a), the body application sheet 100 according to Comparative Example 1 includes four straight line portions 56, which respectively define the four sides of the approximately rectangular shape.

[0052] The results shown in Table 1 show that by including at least three arc-shaped portions 51 in the contour line of the body application sheet 100, each of which is convex outward, it is possible to improve the fit of the body application sheet 100 and the ease of application without changing the set value of the ball number. Also, from the viewpoint of obtaining better fit and ease of application, it is preferable that the body application sheet 100 include four arc-shaped portions 51. Furthermore, from the viewpoint of obtaining even better ease of application, it is preferable that the first pair of arc-shaped portions 52, 53 have the same radius of curvature, and that the second pair of arc-shaped portions 54, 55 have the same radius of curvature.

[0053] Next, Examples 5 to 7 and Comparative Examples 2 and 3 will be explained with reference to Tables 1 and 2 and FIG. 10(b).

[0054] [Table 2]

[0055] Example 5 differs from Example 1 in that it is formed in a substantially rectangular shape with a dimension of 140 mm in the first direction and a dimension of 100 mm in the second direction (referred to as "second rectangular shape" in Table 2), but is otherwise configured similarly. Similarly, Example 6 differs from Example 2 in that it is formed in a substantially rectangular shape with a dimension of 140 mm in the first direction and a dimension of 100 mm in the second direction, but is otherwise configured similarly. Example 7 differs from Example 3 in that it is formed in a substantially rectangular shape with a dimension of 140 mm in the first direction and a dimension of 100 mm in the second direction, but is otherwise configured similarly. Furthermore, Comparative Example 2 differs from Comparative Example 1 in that it is formed in a substantially rectangular shape (referred to as "second rectangular shape" in Table 2) with a dimension of 140 mm in the first direction and a dimension of 100 mm in the second direction, but is otherwise configured similarly. Comparative Example 3 differs from Example 3 in that it is formed in a substantially square shape (referred to as "square shape" in Table 2) with a dimension of 150 mm in the first direction and a dimension of 150 mm in the second direction, as shown in Figure 10(b), but is otherwise configured similarly.

[0056] From the results shown in Tables 1 and 2, it was found that even in the case of a body application sheet 100 that is formed into a rectangular shape in which the ratio between the dimension in the first direction and the dimension in the second direction is different from the first rectangular shape, by having the outer contour of the body application sheet 100 include at least three arc-shaped portions 51 that each convex outward, it is possible to improve the fit of the body application sheet 100 and the operability when applying it without changing the setting value of the above-mentioned ball number. Furthermore, it was found that by making the planar shape of the body application sheet 100 approximately rectangular, it is possible to improve the fit of the body application sheet 100 and the operability when applying it without changing the setting value of the ball number.

[0057] Next, Examples 8 to 11 and Comparative Examples 4 to 6 will be explained using Table 3.

[0058] [Table 3]

[0059] Examples 8 to 11 are configured in the same manner as Example 1. However, the ball number is set to 22 in Example 8, 16 in Example 9, 14 in Example 10, and 12 in Example 11, respectively. Similarly, Comparative Examples 4 to 6 are configured in the same manner as Comparative Example 1. However, the ball number is set to 22 in Comparative Example 4, 16 in Comparative Example 5, and 14 in Comparative Example 6, respectively.

[0060] The results shown in Table 3 indicate that even when the ball number is between 22 and 14, the fit of the body adhesive sheet 100 and ease of application are improved by including at least three arc-shaped portions 51 in the contour lines of the body adhesive sheet 100, each of which is convex outward. That is, according to the present invention, a high fit (resistance to lifting) of the body adhesive sheet 100 can be achieved even when the ball number is 16 or less. Furthermore, from the two viewpoints of fit and ease of application, the body adhesive sheet 100 of Example 8 was found to be the most preferable. Furthermore, from the three viewpoints of fit, skin irritation during removal, and ease of application, Examples 9 and 10 were found to be the most preferable. That is, according to the present invention, sufficient fit (resistance to lifting) can be achieved even when the ball number is less than 18, and therefore, a ball number of 16 or less can be used in consideration of ease of application, thereby achieving both a high fit and ease of application. [Explanation of symbols]

[0061] 10 Base material 10a One side 20 Adhesive layer 30 Heating element 40 Release film 51 Arc part 51a End 61 Corner 61a End 100 Body adhesive sheets

Claims

1. A sheet for application to the body, the contour line of the body adhesive sheet includes at least three arc-shaped portions each protruding outward; The arc-shaped portions are connected to each other via arc-shaped corners that are convex outward, Each arcuate portion is longer than each corner portion; a portion including an end of the arc-shaped portion and an end of the corner portion adjacent to the arc-shaped portion has an outwardly convex arc shape, The overall shape of the body application sheet is such that the dimension in a first direction in which the overall length is greatest is longer than the dimension in a second direction perpendicular to the first direction, The body adhesive sheet has a tensile load of 3 N or less required to stretch the body adhesive sheet by 10% in the first direction.

2. The body application sheet according to claim 1, wherein the radius of curvature of each arc-shaped portion is constant throughout the entire arc-shaped portion, or the radius of curvature increases from one end of the arc-shaped portion toward the center in the longitudinal direction.

3. 2. The body adhesive sheet according to claim 1, wherein the radius of curvature of the arc-shaped portion is constant over the entire area.

4. 4. The body adhesive sheet according to claim 3, wherein the radii of curvature of the arcuate portions are equal to each other.

5. 5. The body adhesive sheet according to claim 1, wherein the corner has a constant radius of curvature over the entire area.

6. the outline includes four of the arc-shaped portions and four of the corner portions, the four arc-shaped portions include a first pair of arc-shaped portions facing each other and a second pair of arc-shaped portions facing each other; the first pair of arcuate portions have the same shape as each other; the second pair of arcuate portions are identical in shape to one another; The body adhesive sheet according to any one of claims 1 to 5, wherein the length of each of the first pair of arc-shaped portions is longer than the length of each of the second pair of arc-shaped portions.

7. 7. The body adhesive sheet according to claim 1, wherein an adhesive layer for adhering the body adhesive sheet to the body is formed along at least the periphery of the body adhesive sheet.

8. 8. The body adhesive sheet according to claim 7, wherein the adhesive layer is formed on the entire surface of the body adhesive sheet.

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