Absorbent sheet with auxiliary pad
The sanitary napkin with an auxiliary pad and perforated attachment sheet ensures secure attachment and easy removal, preventing blood leakage and extending usage time by addressing detachment issues in conventional designs.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- 古川 彩子
- Filing Date
- 2024-12-27
- Publication Date
- 2026-07-09
AI Technical Summary
Conventional sanitary napkins with auxiliary pads face issues of unintended detachment during use, leading to menstrual blood leakage and damage to the main body, due to either weak or strong adhesive forces.
A sanitary napkin design featuring an auxiliary pad attached via an attachment sheet with perforations, allowing easy removal without shifting position, and a leak-proof pocket formed by the remaining attachment sheet after removal.
Prevents positional shifting and easy detachment of the auxiliary pad, reducing menstrual blood leakage and extending the napkin's usage time by half, while maintaining a secure attachment to underwear.
Smart Images
Figure 2026115218000001_ABST
Abstract
Description
Technical Field
[0006] , ,
[0001] The present invention relates to a liquid-absorbent sheet provided with an auxiliary pad, for example, a sanitary napkin provided with an auxiliary napkin.
Background Art
[0002] Conventionally, a sanitary napkin provided with an auxiliary napkin has been proposed in which an auxiliary napkin is attached onto the napkin with a peelable adhesive force in order to achieve long-term use with a single sanitary napkin (see Patent Document 1).
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] A general sanitary napkin has an adhesive portion on the non-skin side for attaching to underwear and fixing the position. In Patent Document 1, it is proposed to set the adhesive force of the auxiliary napkin to be weak so that the sanitary napkin itself does not peel off from the underwear when the auxiliary napkin is peeled off.
[0005] If the adhesive force of the auxiliary napkin is weak, there is a risk that the auxiliary napkin will come off from the main body of the sanitary napkin at an unintended timing during actual use and cause displacement. In this case, there is a problem that menstrual blood leakage occurs and stains the underwear and clothes. On the other hand, if the adhesive force of the auxiliary napkin is increased, there is not only a risk that the sanitary napkin will peel off from the underwear when the auxiliary napkin is peeled off, but also a risk of damaging the surface of the main body of the sanitary napkin and causing an unintended menstrual blood leakage.
[0006] The present invention has been made to solve the problems of the above-mentioned conventional examples, and aims to provide an absorbent sheet equipped with an auxiliary pad, such as a sanitary napkin with an auxiliary napkin, in which there is no risk of the auxiliary pad shifting position during use, and the auxiliary pad can be removed with light force. [Means for solving the problem]
[0007] To achieve the above objective, the liquid-absorbing sheet equipped with the auxiliary pad of the present invention comprises a substantially rectangular sheet-shaped main body, an attachment sheet, and an auxiliary pad. The attachment sheet is attached to the main body at the attachment position along the edges on both sides in the short direction of the main body, and has two perforations for tearing inside from the edges on both sides. Furthermore, it has a portion attached to the main body from the start and end of the edges on both sides toward the nearest perforation, up to or just before the perforation, and the central portion of the lower surface of the auxiliary pad, located inside the edges on both sides, is attached to the portion of the attachment sheet inside the two perforations.
[0008] Furthermore, it is preferable that the mounting sheet is sewn to the main body at the mounting position along the edges on both sides in the shorter direction of the main body, and that it has portions that are sewn to the main body from the starting and ending ends of the edges on both sides toward the perforations, up to or just before the perforations.
[0009] Preferably, the central portion of the auxiliary pad, located inside the edges on both sides of the lower surface, is glued or sewn to the portion of the mounting sheet inside the two perforations.
[0010] Preferably, the bottom surface of the auxiliary pad is treated to prevent liquid leakage. [Effects of the Invention]
[0011] According to the present invention, the auxiliary pad is attached to the main body of the absorbent sheet via an attachment sheet and does not easily shift position. Furthermore, since it can be removed with light force along the perforations (dashed lines) provided on the attachment sheet, there is less risk of it peeling off the underwear when removed. [Brief explanation of the drawing]
[0012] [Figure 1] A perspective view of a sanitary napkin equipped with an auxiliary napkin, according to an embodiment of the absorbent sheet equipped with an auxiliary pad of the present invention. [Figure 2] An exploded perspective view showing the composition of a sanitary napkin. [Figure 3] The diagram shows (a) the sanitary napkin itself, (b) the attachment sheet, and (c) the auxiliary napkin. [Figure 4] (a) The image shows a sanitary napkin with the attachment sheet attached to the napkin itself, and (b) the adhesive surface on the bottom of the auxiliary napkin is shown with a shading. [Figure 5] Figure 4 shows the state in which an auxiliary napkin is attached and secured to the mounting sheet on the main napkin body. [Figure 6] A perspective view showing how to peel off the auxiliary napkin attached to the main napkin along the perforations on the attachment sheet. [Figure 7] A perspective view of a sanitary napkin after the auxiliary napkin has been removed. [Modes for carrying out the invention]
[0013] The absorbent sheet equipped with the auxiliary pad of the present invention consists of a substantially rectangular sheet-like main body, an attachment sheet, and an auxiliary pad. The attachment sheet is attached to the main body along the edges on both sides in the shorter direction at the attachment position, and has two perforations (meaning dashed lines, the same applies hereinafter) for tearing inward from both edges. Furthermore, the attachment sheet has a portion attached to the main body from the start and end of both edges toward the nearest perforation, up to or just before the perforation. The central portion of the lower surface of the auxiliary pad, located inward from both edges, is attached to the portion of the attachment sheet inward from the two perforations. By adopting this configuration, the auxiliary pad is prevented from shifting position during use and can be easily peeled off along the perforations. Furthermore, after the auxiliary pad is peeled off, the attachment sheet remaining on the main body forms a leak-proof pocket on the main body to prevent lateral leakage of menstrual blood or urine.
[0014] Referring to the attached drawings, a sanitary napkin 1 equipped with an auxiliary napkin according to an embodiment of the absorbent sheet with an auxiliary pad of the present invention will be described. The substantially rectangular sheet-shaped main body, attachment sheet, and auxiliary pad of the absorbent sheet with an auxiliary pad of the present invention correspond to the napkin body 2, attachment sheet 4, and auxiliary pad 3 of the sanitary napkin 1 equipped with an auxiliary napkin, respectively. In the case of the sanitary napkin 1, the liquid absorbed by the absorbent sheet corresponds to menstrual blood.
[0015] Figure 1 is a perspective view of a sanitary napkin 1, specifically showing it folded in the direction expected during use. The sanitary napkin 1 is a roughly rectangular sheet-like product manufactured using natural materials such as cotton, or absorbent sheet materials such as cotton pulp, superabsorbent polymers, or nonwoven fabrics made from synthetic fibers. "Sheet material" refers to a material that is relatively small and thin in the thickness direction compared to its flat surface, like paper or a board. The sanitary napkin 1 consists of a roughly rectangular sheet-like napkin body 2 and an auxiliary napkin 3 attached to the napkin body 2 via an attachment sheet 4. The non-skin side of the napkin body 2, i.e., the bottom surface in this figure, has an adhesive surface (not shown) for attaching the napkin to underwear, and further has wing-like parts 2a and 2b for wrapping around underwear and securing it firmly. Whether or not to include the wing-like parts 2a and 2b is optional. Furthermore, the bottom surface of the napkin body 2 is fitted with a thin, leak-proof resin sheet having the aforementioned adhesive surface, providing a treatment to prevent menstrual blood from leaking onto underwear.
[0016] The edges on both sides of the auxiliary napkin 3 are provided with leak-proof pockets 3a and 3b (also called leak-proof gathers due to their appearance; however, because they are pocket-shaped, they cannot be turned to the other side) to prevent menstrual blood from leaking out to the sides. The leak-proof pockets 3a and 3b are pocket-shaped structures attached to the main body of the auxiliary napkin 3 by sewing, bonding, or welding rectangular nonwoven fabric, preferably a sheet material that does not allow menstrual blood to seep through or leak, to the edges on both sides of the auxiliary napkin, and to line-shaped portions extending inward from the start and end of the edges. As shown in Figure 1, when the sanitary napkin 1 is used, it is used in a state where it is bent towards the non-skin side (the side with the crotch area of the underwear), and as a result, menstrual blood that flows to the side is prevented from leaking out by these leak-proof pockets 3a and 3b.
[0017] FIG. 2 is an exploded perspective view showing the configuration of a substantially rectangular sheet-like sanitary napkin 1. The longitudinal direction and the lateral direction of the napkin main body 2 of the sanitary napkin 1 are shown in the figure. In this specification, the "edges" of the sanitary napkin 1, the napkin main body 2, the auxiliary napkin 3, and the attachment sheet 4 refer to the straight edges extending along the longitudinal direction on both sides in the lateral direction of the sanitary napkin 1 or the vicinity thereof. Even when the blade-like portions 2a and 2b are provided, the "edges" refer to the straight edges extending along the longitudinal direction on both sides in the lateral direction of the sanitary napkin 1 when the blade-like portions 2a and 2b are not provided on the sanitary napkin 1.
[0018] The sanitary napkin 1 is manufactured by attaching the edges on both sides of the attachment sheet 4 onto the napkin main body 2 and then attaching and fixing the adhesive surface 3c provided at the central portion located inside the edges on both sides of the bottom surface of the auxiliary napkin 3 to the central portion of the attachment sheet 4. The bottom surface of the auxiliary napkin 3 is attached with a thin resin sheet having an adhesive surface 3c (see FIG. 4(b)) at the central portion located inside the edges on both sides thereof, and is subjected to a menstrual blood leakage prevention treatment for the napkin main body 2.
[0019] Inside the edges on both sides of the napkin main body 2, there may be provided members (not shown) in which the sheet material stands up to prevent leakage (also referred to as three-dimensional gathers from their appearance. However, they turn outward depending on the use state). This three-dimensional gather exhibits a lateral leakage prevention function at the front and rear portions of the napkin main body 2 not covered by the auxiliary napkin 3. Further, after the auxiliary napkin 3 is removed, the portions 4a and 4c of the attachment sheet 4 remaining on the napkin main body 2 function as new leakage prevention pockets that have not been soiled by the previous use (see FIG. 7), and the three-dimensional gather exhibits an auxiliary lateral leakage prevention function.
[0020] The attachment sheet 4 uses, for example, natural materials such as cotton or non-woven fabrics, etc., and preferably uses a sheet material that does not allow menstrual blood to leak. Two cutting perforations 4d and 4e are provided at a distance defined from the edges on both sides of the attachment sheet 4. Among the three parts 4a, 4b, and 4c divided by these two perforations 4d and 4e, the adhesive surface 3c of the auxiliary napkin 3 is pasted and fixed to the central part 4b. By providing the adhesive surface 3c in the central part located inside from the edges on both sides of the bottom surface of the auxiliary napkin 3, the auxiliary napkin 3 covers the central part 4b of the attachment sheet 4 and prevents menstrual blood from adhering to the napkin body 2.
[0021] Figure 3 shows front views of (a) the napkin body 2, (b) the attachment sheet 4, and (c) the auxiliary napkin 3 of the sanitary napkin 1. The napkin body 2 has, for example, a thickness of 3 to 5 mm, a longitudinal length L1 = 260 mm, a transverse length L2 = 80 mm, and the wing-shaped parts 2a and 2b protrude, for example, 30 mm horizontally. The attachment sheet 4 has, for example, a thickness of 0.2 mm, a longitudinal length L4 = 100 mm, a transverse length L5 = 90 mm, and perforation cuts 4d and 4e are provided at a width W1 = 10 mm. The auxiliary napkin 3 has, for example, a thickness of 3 to 5 mm, a longitudinal length L6 = 100 mm, a transverse length L7 = 90 mm, and leakage prevention pockets 3a and 3b with a length L6 = 100 mm and a width W2 = 12 mm are provided at the edge parts on both sides.
[0022] The transverse length L7 of the auxiliary napkin 3 is preferably such that it completely covers the perforations 4d and 4e of the attachment sheet 4. By adopting this configuration, it is possible to prevent menstrual blood from adhering to the perforations 4d and 4e and becoming easily peeled off when the auxiliary napkin 3 is used. Also, the transverse length L7 of the auxiliary napkin 3 may be larger than the transverse length L5 of the attachment sheet 4. By adopting this configuration, it is possible to more effectively prevent menstrual blood from adhering to the napkin body 2 when the auxiliary napkin 3 is used.
[0023] Also, a seam indicated by a dotted line 3d may be provided at the upper part of the auxiliary napkin 3 so that menstrual blood does not reach the inside, and it may be used as a part to pinch when removing. Alternatively, a separate handle may be provided.
[0024] Figure 4(a) shows the attachment sheet 4 attached to the napkin body 2 shown in Figure 3, in the shape of the dotted lines 5a and 5b. Generally, the attachment position of the attachment sheet 4 is slightly forward of the midpoint of the napkin body 2, that is, slightly upward in the figure. At the attachment position, the attachment sheet 4 is attached along the edges on both sides of the napkin body 2 (from P1 to P2, and from P5 to P6). In this example, it is sewn from P1 to P2 and from P5 to P6. Furthermore, the attachment sheet 4 is attached to the napkin body in a line from the start and end points (P1, P2, P5, P6) of the edges on both sides of the napkin body 2 toward the proximal perforations 4d and 4e, up to or just before the perforations. In this example, the edges are sutured in a line from the starting point P1 to P3 near the perforation, from the end point P2 to P4 near the perforation, from the starting point P5 to P7 near the perforation, and from the end point P6 to P8 near the perforation. Hereafter, the parts attached in a line, as shown by the dotted lines 5a and 5b, will be referred to as the [line-shaped] or [line-shaped] attached parts.
[0025] Furthermore, as long as the condition is met that a pocket-like structure is formed by sewing P1 to P2, P1 to P3, P2 to P4, and P5 to P6, P5 to P7, and P6 to P8 in a linear fashion, for example, instead of sewing P1 to P3 and P2 to P4, only P3 and P4 may be sewn, and similarly, instead of sewing P5 to P7 and P6 to P8, only P7 and P8 may be sewn. Also, the embodiment of "sewing in a linear fashion" includes, upon closer examination, implementations of sewing with some zigzag, curve, markings, and other geometric shapes. Numerous sewing methods are possible without changing the purpose.
[0026] Figure 4(b) shows the adhesive surface 3c located in the central part of the lower surface of the auxiliary napkin 3, excluding the edges on both sides, i.e., inside the edges on both sides, in this embodiment, inside the leak-proof pockets 3a and 3b, with the adhesive surface 3c shaded. The adhesive surface 3c is smaller than the central part 4b of the attachment sheet 4. If a seam, indicated by a dotted line 3d, is added to the top of the auxiliary napkin 3 to prevent menstrual blood from reaching the inside and to serve as a part to be pinched when removing it, the attachment sheet 4 will also be pinched together, allowing for more secure removal.
[0027] Figure 5 shows the state in which the adhesive surface 3c (shaded area) of the auxiliary napkin 3 is attached to and secured to the central portion 4b of the attachment sheet 4 which is attached to the napkin body 2 shown in Figure 4(a). This process completes the sanitary napkin 1.
[0028] Figure 6 is a perspective view showing the process of removing the auxiliary napkin 3 from the sanitary napkin 1. After use, the auxiliary napkin 3 is attached to the sanitary napkin 1 and then peeled off from the napkin body 2. Since the auxiliary napkin 3 is attached to the attachment sheet 4, the attachment sheet 4 is also peeled off together. The force required for this peeling is much weaker than the adhesive force of the adhesive part to which the auxiliary napkin 3 is attached to the attachment sheet 4. At this time, the central part 4b of the attachment sheet 4 is peeled off at the perforations 4d and 4e provided on the attachment sheet 4, and the parts 4a and 4c located near the edges on both sides remain on the napkin body 2.
[0029] Figure 7 is a perspective view showing the napkin body 2 after the auxiliary napkin 3 has been removed, and is shown folded in the direction expected during use. As shown in Figure 4(a), the parts 4a and 4c located near the edges on both sides of the attachment sheet 4 are attached in a [shape] and [shape] respectively, and the remaining parts 4a and 4c do not hang down (turn up) during use, and each functions as a leak-proof pocket for menstrual blood. In other words, when the auxiliary napkin 3 is attached, the leak-proof pockets 3a and 3b prevent menstrual blood leakage from the sanitary napkin 1, and even after the auxiliary napkin 3 is removed, the remaining parts 4a and 4c of the attachment sheet 4 function as new leak-proof pockets that have not been soiled by previous use, preventing menstrual blood leakage.
[0030] As explained above, the sanitary napkin 1 has a support napkin 3 that is securely fixed to the napkin body 2, eliminating the risk of the support napkin 3 shifting position during use. At the same time, it can be peeled off with light force along the perforations 4d and 4e provided on the attachment sheet 4. This prevents damage to the surface of the napkin body 2 when peeling off the support napkin 3, and also prevents the sanitary napkin 1 from peeling off the underwear. Furthermore, the remaining part of the attachment sheet 4 has the excellent advantage of functioning as a leakage prevention pocket for the napkin body 2 after the support napkin 3 has been removed. This fact makes it possible to use it for extended periods with peace of mind on days with heavy menstrual flow.
[0031] By simply removing the auxiliary napkin 3 midway through, sanitary napkin 1 can be used comfortably for approximately twice as long. In other words, once sanitary napkin 1 is attached, the frequency of changing the entire napkin 1 can be halved, thereby reducing the inconvenience of carrying a napkin to the toilet, which can be undesirable in certain situations, and the hassle of changing it.
[0032] It should be noted that the present invention is not limited to the configurations of the above-described embodiments, and various modifications are possible without altering the spirit of the invention. For example, the attachment sheet 4, which is placed on and sewn onto the napkin body 2, may be heat-welded in a linear pattern.
[0033] The roughly rectangular sheet-like napkin body 2 may have its corners significantly rounded, as shown in the figure, or conversely, it may be closer to a rectangular shape. Furthermore, the width in the short direction may be shaped at the midpoint in the longitudinal direction of the roughly rectangular sheet-like napkin body 2. In this case, the "edges" on both sides in the short direction of the sanitary napkin 1, napkin body 2, auxiliary napkin 3, and attachment sheet 4 refer to edges that conform to this shaped form.
[0034] Alternatively, the auxiliary napkin 3 may be attached by sewing it to the central portion 4c of the attachment sheet 4. Specifically, the auxiliary napkin 3 may be sewn to the attachment sheet 4 along the rectangular outline of the adhesive surface 3c shown in the shaded area. In this case, the auxiliary napkin 3 should be attached to the attachment sheet 4 before attaching the attachment sheet 4 to the napkin body 2. [Industrial applicability]
[0035] The absorbent sheet equipped with the auxiliary pad of the present invention can be used not only as a sanitary napkin equipped with an auxiliary napkin, but also as a urine leakage prevention sheet equipped with an auxiliary pad. In this case as well, the configuration of the main body, attachment sheet, and auxiliary pad remains the same. In the case of a urine leakage prevention sheet, the liquid absorbed by the absorbent sheet corresponds to urine. [Explanation of Symbols]
[0036] 1. Sanitary napkin with auxiliary pad (corresponding to the absorbent sheet with auxiliary pad of the present invention) 2. Napkin body (corresponding to a roughly rectangular, sheet-like body) 3. Supplementary napkins (equivalent to supplementary pads) 4. Mounting sheet (equivalent to a mounting sheet) 4d, 4e Perforated cuts 5a [Dotted line indicating the mounting portion of the mounting sheet] 5b] Dotted line indicating the mounting portion of the mounting sheet
Claims
1. The absorbent sheet is characterized by comprising a roughly rectangular sheet-like main body (2), an attachment sheet (4), and an auxiliary pad (3), wherein the attachment sheet is attached along the edges on both sides in the shorter direction of the main body at the attachment position, and has two perforations (4d, 4e) for tearing inward from the edges on both sides, and further has a portion attached to the main body from the start and end of the edges on both sides toward the nearest perforation, to the perforation or just before it, and the central portion (3c) of the lower surface of the auxiliary pad, which is located inward from the edges on both sides, is attached to the portion (4d) of the attachment sheet that is inward from the two perforations.
2. The absorbent sheet equipped with the auxiliary pad according to claim 1, characterized in that the mounting sheet is sewn along the edges on both sides in the short direction of the main body at the mounting position to the main body, and further has portions that are sewn to the main body from the start and end of the edges on both sides toward the perforation, to the perforation or just before the perforation.
3. The absorbent sheet comprising the auxiliary pad according to claim 1 or 2, characterized in that the central portion of the lower surface of the auxiliary pad, excluding the edges on both sides, is adhered to or sewn to the portion of the mounting sheet that is inside the two perforations.
4. The bottom surface of the auxiliary pad is treated to prevent liquid leakage, characterized in that the sheet comprises the auxiliary pad according to claim 1 or 2.