Pack sheet for the mouth area

Abstract

Provided is a lip pack sheet that has high followability to the movement of the skin at the application site and is difficult to peel off. 【Solution means】A lip pack sheet 1 attached to the lip, having a concave curved portion 111 that is concave and curved in a plan view of the lip pack sheet, and a straight line distance L that is the length of a first virtual straight line V1 connecting both ends 111a and 111b of the concave curved portion 111, and a depth d that is the distance between the deepest point 111c, which is the farthest from the first virtual straight line V1 among the concave curved portions, and the first virtual straight line V1 are configured to satisfy the following formula (1). L / d ≥ 4.1 ··· Formula (1)

Description

Technical Field

[0001] The present invention relates to a mouthpiece pack sheet.

Background Art

[0002] Patent Document 1 discloses a cosmetic pack sheet in which a sheet-like base material is impregnated with a chemical solution such as a beauty liquid and is used by being adhered to the eye area, the mouth area, etc.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The cosmetic pack sheet disclosed in Patent Document 1 has an L-shape when viewed in a direction perpendicular to the attachment surface of the sheet. In particular, when attached to the mouth area, the portion facing the corners of the mouth is linear, so the followability to the movement of the skin in the mouth area is low and it is easy to peel off.

[0005] The present invention has been devised in view of the above circumstances, and an object thereof is to provide a mouthpiece pack sheet that has high followability to the movement of the skin at the attachment site and is difficult to peel off.

Means for Solving the Problems

[0006] One aspect of the present invention is a mouthpiece pack sheet to be attached to the mouth area, in a plan view of the mouthpiece pack sheet, having a concave curved portion that is concave, A mouthpiece pack sheet is provided, which is configured such that a linear distance L that is the length of a first virtual straight line connecting both ends of the concave curved portion and a depth d that is the distance between the deepest point that is the farthest from the first virtual straight line among the concave curved portion and the first virtual straight line satisfy the following formula (1). L / d ≥ 4.1 ··· Equation (1)

[0007] The concave curved portion may be composed of one or more arcs.

[0008] Further provided with a first support portion and a second support portion at positions along the first virtual straight line, The first support portion is provided on one end side of both ends of the concave curved portion, The second support portion may be provided on the other end side of both ends of the concave curved portion.

[0009] Further provided with a convex curved portion that faces the concave curved portion in a direction perpendicular to the first virtual straight line and curves convexly so as to be away from the concave curved portion, The first support portion and the second support portion may be arranged symmetrically with respect to a second virtual straight line that connects the deepest point and the most protruding point of the convex curved portion as an axis.

Advantages of the Invention

[0010] According to the present invention, it is possible to provide a lip pack sheet that has high followability to the movement of the skin at the attachment site and is difficult to peel off.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4A

Figure 4B

Figure 4C

Figure 4D

Figure 5

Best Mode for Carrying Out the Invention

[0012] (Embodiment) Hereinafter, a preferred embodiment of the mouth pack sheet of the present invention (hereinafter referred to as pack sheet 1) will be described with reference to the accompanying drawings.

[0013] FIG. 1 is a schematic view showing a pack sheet 1 according to an embodiment of the present invention. FIG. 1 shows a front view of a user. Also, the vertical direction shown in FIG. 1 coincides with the direction along the nasolabial folds of the user. As shown in FIG. 1, the pack sheet 1 is attached to the mouth area of the face (near the mouth M). The pack sheet 1 is attached to the skin so as to cover the nasolabial folds and used. The nasolabial folds are formed, for example, in a range where the distance (distance in a direction orthogonal to the vertical direction) from the mouth corner MC of the mouth M of the face is 10 mm to 40 mm. Hereinafter, the portion to which the pack sheet 1 is attached is referred to as an attachment site. One end of the attachment site is the end facing the mouth corner MC among the peripheries of the attachment site, and the distance X (distance in a direction orthogonal to the vertical direction) from the mouth corner MC is set at a position in the range of, for example, 5 mm to 50 mm. In this specification, the distance in a direction orthogonal to the vertical direction means the horizontal distance in a state where the user stands upright, that is, the horizontal distance. Note that in FIG. 1, only the pack sheet 1 attached to the left side of the mouth M is shown, but the pack sheet 1 can be attached and used on both sides of the mouth M.

[0014] FIG. 2 is a cross-sectional view showing the pack sheet 1 taken along line II-II shown in FIG. 1. As shown in FIG. 2, the pack sheet 1 has a three-layer structure and includes a support 2, an adhesive layer 3, and a separator 4.

[0015] The support 2 is composed of a fibrous aggregate such as a sheet-like non-woven fabric, a woven fabric, and a knitted fabric that supports the adhesive layer 3. The fibers are, for example, polyester, polyurethane, etc. In this embodiment, the support 2 is a non-woven fabric made of polyester.

[0016] The adhesive layer 3 is disposed in contact with the support 2, has adhesiveness, and adheres to the skin at the facial attachment site. The adhesiveness of the adhesive layer 3 may be composed only of an adhesive, or may be composed of a product of an adhesive and a crosslinking agent. The adhesive layer 3 may contain a lipophilic solvent. In this case, the solvent contained in the adhesive layer 3 may be only a lipophilic solvent. Further, at least one of a functional component and an additive may be added to the adhesive layer 3 as needed. The functional component is a component that is considered to be effective in maintaining the health of a living body such as a human or in the life activities of a living body including mitigation of harmful substances. The additive is an auxiliary component blended to enhance the stability and storage properties of the pack sheet 1, etc.

[0017] Examples of the adhesive include acrylic adhesives (such as HiPAS-10). As the crosslinking agent, any crosslinking agent can be used as long as it is applicable to the adhesive. Examples thereof include isocyanate-based crosslinking agents (such as Sunpaster HD-739D).

[0018] As the lipophilic solvent, any lipophilic solvent can be used as long as it is compatible with the adhesive or the product of the adhesive and the crosslinking agent. Examples of the lipophilic solvent include isopropyl myristate. The lipophilic solvent may have the property of swelling the adhesive, the property of moisturizing the user's skin, or both of these properties.

[0019] The functional component can be arbitrary as long as it is a component that is considered to be effective in life activities, and examples thereof include tocopherol acetate, plant oil containing vitamin A, ubiquinone, sodium hyaluronate, pyridoxine tris(hexyldecanoate), etc. The additive may contain preservatives such as parabens and phenoxyethanol, pigments such as cacao pigment and turmeric pigment, and fragrances such as orange oil and lavender oil.

[0020] The separator 4 is a protective material for protecting the surface of the adhesive layer 3, and is removed from the adhesive layer 3 before the adhesive layer 3 is attached to the skin. The separator 4 is preferably made of a material that does not absorb or is difficult to adsorb the drug contained in the adhesive layer 3. The separator 4 is composed of, for example, polyethylene terephthalate. The separator 4 has a slit 41 for facilitating the removal of the separator 4 from the adhesive layer 3.

[0021] FIG. 3 is a plan view of the pack sheet 1 (on the support 2 side) along the lamination direction of the support 2, the adhesive layer 3, and the separator 4.

[0022] As shown in FIG. 3, the pack sheet 1 has a substantially arcuate shape in plan view. The pack sheet 1 includes a base portion 11 that curves in a substantially U shape, and two support portions 12 disposed at both ends of the base portion 11. In the present embodiment, there are inflection points at the boundaries between the base portion 11 and the two support portions 12. Hereinafter, among the two support portions 12, the support portion 12 provided on one end side of both ends of the concave curved portion 111 is referred to as the first support portion 121, and the support portion 12 provided on the other end side is referred to as the second support portion 122.

[0023] The base portion 11 has a concave curved portion 111 and a convex curved portion 112. When in use, the pack sheet 1 is attached to the attachment site such that the concave curved portion 111 is on the side closer to the mouth. Also, in the present embodiment, the pack sheet 1 is attached to the attachment site such that the first support portion 121 is located above the base portion 11. In this case, since the attachment site of the first support portion 121 can be changed according to the size of the pack sheet 1, the first support portion 121 may be located near the nose. Also, the pack sheet 1 may be attached to the attachment site such that the second support portion 122 is located above the base portion 11 with the vertical direction as the axis of symmetry. In this case, for the same reason as the first support portion 121, the attachment site of the second support portion 122 may be located near the nose.

[0024] The concave curved portion 111 is curved concave toward the inside of the base portion 11 (the convex curved portion 112 side). In the present embodiment, the concave curved portion 111 is formed of an arc of a single virtual circle. For example, the radius of curvature R, which is the radius from the center O of the concave curved portion 111, is set to be 13 mm or more and 47 mm or less.

[0025] The concave curved portion 111 includes a first concave curved end portion 111a that is a boundary (inflection point) with the first support portion 121, and a second concave curved end portion 111b that is a boundary (inflection point) with the second support portion 122. The distance between the first concave curved end portion 111a and the second concave curved end portion 111b, that is, the linear distance L that is the length of the first virtual straight line V1 connecting both ends of the concave curved portion 111, is set to a value considering the followability with respect to the expansion and contraction of the skin. In the present embodiment, the linear distance L is set such that its value is 20 mm or more. Thereby, the followability of the pack sheet 1 with respect to the expansion and contraction of the skin is improved, and it becomes difficult for the pack sheet 1 to peel off from the skin attachment site. The linear distance L may be set in consideration of the ease of attachment to the attachment site. The upper limit of the linear distance L is not particularly limited, but the linear distance L may be, for example, 50 mm or less, 45 mm or less, 40 mm or less, 35 mm or less, or 34 mm or less. Also, the linear distance L may be 25 mm or more or 30 mm or more.

[0026] Further, the concave curved portion 111 further includes a point that is the farthest from the first virtual straight line V1 among the concave curved portion 111, that is, in the present embodiment, the deepest point (hereinafter referred to as the deepest point 111c). In the present embodiment, the deepest point 111c is between the first concave curved end portion 111a and the second concave curved end portion 111b (midpoint).

[0027] The depth d, which is the linear distance from the deepest point 111c to the first virtual straight line V1, is set to a value considering the relationship with the first virtual straight line V1 so that the followability with respect to the expansion and contraction of the skin is improved. Specifically, the relationship between the linear distance L and the depth d is set to satisfy the following formula (1). L / d ≧ 4.1 ··· Formula (1)

[0028] The upper limit of L / d is not particularly limited, but L / d may be, for example, 7.0 or less. When L / d is greater than 7.0, the followability of the concave curved portion 111 can be obtained, but there is a possibility that the adhesion becomes weak in a part of the convex curved portion 112. L / d may be 6.5 or less, may be 6.0 or less, may be 5.7 or less, may be 5.6 or less, may be 5.5 or less, may be 5.4 or less, may be 5.3 or less, may be 5.2 or less. Also, L / d may be 4.2 or more, may be 4.5 or more, may be 5.0 or more, may be 5.1 or more.

[0029] Further, the relationship between the radius of curvature R of the concave curved portion 111 and the linear distance L of the first virtual straight line V1 connecting both ends of the concave curved portion 111 is set to a value such that the followability of the pack sheet 1 with respect to the stretching and contraction of the skin is improved and the pack sheet 1 is less likely to peel off from the skin attachment site. Specifically, the relationship between the radius of curvature R of the concave curved portion 111 and the linear distance L of the first virtual straight line V1 connecting both ends of the concave curved portion 111 is configured to satisfy the following formula (2) because there is a possibility that the concave curved portion 111 and the support portion 12 (the first support portion 121 and the second support portion 122) become discontinuous if the value is too small. R / L≧0.50 ··· Formula (2)

[0030] The upper limit of R / L is not particularly limited, but R / L may be, for example, 0.95 or less. When R / L is greater than 0.95, the followability of the concave curved portion 111 can be obtained, but there is a possibility that the adhesion becomes weak in a part of the convex curved portion 112. R / L may be 0.9 or less, may be 0.85 or less, may be 0.8 or less, may be 0.75 or less. Also, R / L may be 0.63 or more, may be 0.65 or more, may be 0.7 or more, may be 0.74 or more.

[0031] The convex curved portion 112 faces the concave curved portion 111 in a direction orthogonal to the first virtual straight line V1. The convex curved portion 112 curves convexly toward the outside of the base portion 11 (the side away from the concave curved portion 111). The convex curved portion 112 includes a first convex curved end portion 112a and a second convex curved end portion 112b which are boundaries (inflection points) with the support portion 12. The convex curved portion 112 is formed of an arc different from the virtual circle forming the concave curved portion 111. When the radius of curvature R of the concave curved portion 111 is 27 mm, the radius of curvature of the convex curved portion 112 is, for example, 34 mm. That is, the radii of curvature of the concave curved portion 111 and the convex curved portion 112 are different. When the convex curved portion 112 is formed of an arc, the center of the convex curved portion 112 is at a position different from the center O of the concave curved portion 111.

[0032] Further, the convex curved portion 112 further includes a point farthest from the first virtual straight line V1, that is, in this embodiment, the most protruding point (hereinafter referred to as the most protruding point 112c). In this embodiment, the most protruding point 112c is between the first convex curved end portion 112a and the second convex curved end portion 112b (the midpoint).

[0033] The first support portion 121 and the second support portion 122 are arranged at positions along the first virtual straight line V1 (on the extension line of the first virtual straight line V1). By providing the first support portion 121 and the second support portion 122 in this way, the base portion 11 can be stably supported, and the pack sheet 1 can be stably attached to the attachment site.

[0034] Each of the first support portion 121 and the second support portion 122 is semi-circular in plan view and has an arc portion 12a and a chord portion 12b. The inner intersection point of the arc portion 12a and the chord portion 12b of the first support portion 121 overlaps with the inflection point (the first concave end portion 111a) of the arc portion 12a and the concave curved portion 111 of the base portion 11, and the outer intersection point overlaps with the inflection point (the first convex end portion 112a) of the arc portion 12a and the convex curved portion 112 of the base portion 11. Similarly, the inner intersection point of the arc portion 12a and the chord portion 12b of the second support portion 122 overlaps with the inflection point (the second concave end portion 111b) of the arc portion 12a and the concave curved portion 111 of the base portion 11, and the outer intersection point overlaps with the inflection point (the second convex end portion 112b) of the arc portion 12a and the convex curved portion 112 of the base portion 11. In this embodiment, the radius of curvature of the first support portion 121 and the second support portion 122 is, for example, 10 mm.

[0035] The first support portion 121 and the second support portion 122 are line-symmetrical about a second virtual straight line V2 connecting the deepest point 111c and the most protruding point 112c. With the above configuration, the pack sheet 1 can be stably attached to the attachment site.

[0036] (Example) Hereinafter, an example of the present invention will be described with reference to Table 1.

[0037] To verify the effects of the present invention, as shown in Table 1, the value of L / d, which is the relationship between the straight-line distance L connecting both ends of the concave curved portion and the depth d of the concave curved portion (in Table 1, the straight-line distance L connecting both ends of the concave curved portion, the radius of curvature R of the concave curved portion, and the depth d of the concave curved portion) was changed, and the followability of the concave curved portion with respect to the stretching and contraction of the skin at the attachment site on the face was evaluated. In this evaluation, the horizontal distance between the deepest point of the concave curved portion and the corner of the mouth was set to 10 mm, and the corner of the mouth was defined as the joint portion of the upper lip and the lower lip visually recognized with the interval between the central incisors of the upper jaw and the lower jaw opened by 10 mm. Note that the configuration other than the values of the straight-line distance L connecting both ends of the concave curved portion, the radius of curvature R of the concave curved portion, and the depth d of the concave curved portion is the same as that of the pack sheet 1 described in the embodiment.

[0038] In the evaluation of followability (hereinafter referred to as followability evaluation), the opening and closing of the mouth was performed three times continuously. In the opening and closing operation of the mouth, the state where the distance between the central incisors of the upper jaw and the lower jaw was opened by 30 mm was defined as the open state, and the state where the mouth was completely closed was defined as the closed state.

[0039] In the followability evaluation shown in Table 1, those in which the pack sheet did not peel off even when the opening and closing of the mouth was repeated were evaluated as "A".

[0040] In addition, those in which there was a part where the partial adhesion became weak although the pack sheet did not peel off even when the opening and closing of the mouth was repeated were evaluated as "B".

[0041] Those in which the pack sheet began to peel off when the opening and closing of the mouth was repeated were evaluated as "C".

[0042] As shown in Table 1, in the pack sheets of Comparative Example 1 (L / d = 3.55), Comparative Example 2 (L / d = 3.76), and Comparative Example 3 (L / d = 4.0) where the relationship between the linear distance L and the depth d of the concave portion 111 was outside the range of L / d ≥ 4.1, the result of the followability evaluation was "C".

[0043] On the other hand, in Examples 1 (L / d = 4.24) to 10 (L / d = 5.53) where the relationship between the linear distance L and the depth d of the concave portion 111 was included in the range of L / d ≥ 4.1, evaluations of "B" or "A", which were superior to "C" in the followability evaluation, were obtained.

[0044] Specifically, in Examples 1 (L / d = 4.24) to 6 (L / d = 5.06), "B" was obtained as the result of the followability evaluation, and in Examples 7 (L / d = 5.17) to 10 (L / d = 5.53), an evaluation of "A" was obtained as the result of the followability evaluation.

[0045] From the above, it was found that by setting L / d ≥ 4.1, the followability with respect to the stretching and shrinking of the skin at the attachment site was excellent, and the pack sheet was difficult to peel off from the skin attachment site.

[0046]

Table 1

[0047] (Modified Example) In the above-described embodiment, each of the first support portion 121 and the second support portion 122 has been described as being semi-circular in plan view. However, when viewed in plan view, each of the first support portion 121 and the second support portion 122 may be a polygon such as a triangle shown in FIG. 4A or a quadrilateral shown in FIG. 4B. Further, each of the first support portion 121 and the second support portion 122 may have a shape combining a straight line and a curve as shown in FIG. 4C, or may be elliptical when viewed in plan view as shown in FIG. 4D. Alternatively, at least one of the first support portion 121 and the second support portion 122 may have a shape shown in any of FIGS. 4A to 4D other than semi-circular in plan view.

[0048] Also, in the above-described embodiment, the concave curved portion 111 is composed of an arc of one virtual circle. However, as shown in FIG. 5, the concave curved portion 111 may be composed of arcs of two or more virtual circles.

[0049] The present disclosure may include the following aspects. (Aspect 1) A lip pack sheet to be attached to the mouth, In the plan view of the lip pack sheet, it includes a concave curved portion that is concave, A lip pack sheet configured such that a linear distance L, which is the length of a first virtual straight line connecting both ends of the concave curved portion, and a depth d, which is the distance between the deepest point that is farthest from the first virtual straight line among the concave curved portion and the first virtual straight line, satisfy the following formula (1). L / d ≧ 4.1 ··· Formula (1) (Aspect 2) The lip pack sheet according to Aspect 1, wherein the concave curved portion is composed of one or more arcs. (Aspect 3) It further includes a first support portion and a second support portion at positions along the first virtual straight line, The first support portion is provided on one end side of both ends of the concave curved portion, The second support portion is provided on the other end side of both ends of the concave curved portion, and the lip pack sheet according to Embodiment 1 or 2. (Embodiment 4) Further comprising a convex curved portion that faces the concave curved portion in a direction orthogonal to the first virtual straight line and convexly curves away from the concave curved portion, The first support portion and the second support portion are arranged symmetrically with respect to a second virtual straight line connecting the deepest point and the most protruding point of the convex curved portion, and the lip pack sheet according to Embodiment 3.

Explanation of Signs

[0050] 1 Pack sheet (lip pack sheet) 2 Support 3 Adhesive layer 4 Separator 11 Base 12 Support portion 12a Arc portion 12b Chord portion 41 Slit 111 Concave curved portion 111a First concave curved end 111b Second concave curved end 111c Deepest point 112 Convex curved portion 112a First convex curved end 112b Second convex curved end 112c Most protruding point 121 First support portion 122 Second support portion d Depth M Mouth MC Mouth corner R Radius of curvature V1 First virtual straight line V2 Second virtual straight line L Straight line distance

Claims

1. A lip pack sheet to be attached to the mouth area, comprising a concave curved portion that is concave and curved in a plan view of the lip pack sheet, a lip pack sheet configured such that a linear distance L, which is the length of a first virtual straight line connecting both ends of the concave curved portion, and a depth d, which is the distance between the deepest point, which is the farthest from the first virtual straight line among the concave curved portion, and the first virtual straight line, satisfy the following formula (1). L / d ≥ 4.1... Formula (1)

2. The lip pack sheet according to claim 1, wherein the concave curved portion is composed of one or more arcs.

3. further comprising a first support portion and a second support portion at positions along the first virtual straight line, wherein the first support portion is provided on one end side of both ends of the concave curved portion, and the second support portion is provided on the other end side of both ends of the concave curved portion, the lip pack sheet according to claim 1 or 2.

4. further comprising a convex curved portion that faces the concave curved portion in a direction orthogonal to the first virtual straight line and is convex and curved so as to be away from the concave curved portion, the lip pack sheet according to claim 3, wherein the first support portion and the second support portion are arranged symmetrically with respect to a second virtual straight line that connects the deepest point and the most protruding point that protrudes the most of the convex curved portion as an axis.

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