Elastic skin leakage-proof sanitary towel
By introducing elastic sponge and water-repellent fabric into the leak-proof sides of sanitary napkins, the problems of comfort and side leakage prevention in existing sanitary napkins are solved, achieving natural curvature and better liquid retention performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING SUPERIOR HEALTH TECH CO LTD
- Filing Date
- 2025-01-07
- Publication Date
- 2026-04-28
AI Technical Summary
Existing sanitary napkin products for women are not comfortable to use, are prone to folding and side leakage, and the elastic structure of sanitary napkins has a rough feel, which can easily cause allergies in women's private parts.
The leak-proof sides are made of elastic sponge and water-repellent fabric. Through elastic stretching and combination with the core, surface layer and bottom film, a naturally curved sanitary napkin structure is formed. The elastic sponge's elastic recovery function allows the sanitary napkin to bend as a whole. The leak-proof sides are made of water-repellent fabric to improve comfort and prevent side leakage.
It achieves a good fit between the sanitary napkin and the human body, improves the comfort of use and the anti-leakage performance, enhances the liquid holding capacity, and avoids liquid leakage.
Smart Images
Figure CN224166505U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the manufacturing technology of women's sanitary napkins, and in particular to an elastic, close-fitting, leak-proof sanitary napkin. Background Technology
[0002] Most existing sanitary napkins are flat and do not conform to the body's curves, bending with underwear during use. Their drawbacks include poor comfort, and the forced bending of the napkin core can cause creases and leakage. Flat sanitary napkins are also prone to separating from the body when lying flat or on one's side, easily leading to side leakage. Some flat sanitary napkins have a structure with elastic side bands. While adding elastic to the water-repellent edges allows for bending, this type of sanitary napkin does prevent lateral liquid spread, but the effect is not significant. The elastic bands combined with the non-woven fabric create a rough feel, and friction against the skin in contact with the groin area can easily cause allergies and discomfort in women's private parts. Utility Model Content
[0003] The purpose of this invention is to provide an elastic, form-fitting, leak-proof sanitary napkin that allows the napkin to bend naturally, improving comfort and preventing side leakage.
[0004] To achieve the above objectives, the technical solution of this utility model is: an elastic, close-fitting, leak-proof sanitary napkin, comprising a core (10), a surface layer (20), and a bottom film (30), wherein the core is disposed between the surface layer and the bottom film, characterized in that the core (10) has leak-proof side edges (40) on both sides, and the leak-proof side edges (40) are provided with elastic sponge (48), the leak-proof side edges (40) are attached to the surface layer (20) and the bottom film (30), and the core, surface layer, bottom film and leak-proof side edges are bent toward the surface layer.
[0005] Furthermore, in order to achieve the curved structure of the sanitary napkin, the leak-proof side (40) is a leak-proof side made of water-repellent fabric, and the elastic sponge (48) is attached to the leak-proof side (40) by elastic stretching. After the elastic sponge shrinks, the leak-proof side (40), the surface layer (20), and the bottom film (30) bend towards the surface layer side.
[0006] Furthermore, a composite structure of a core-fitting elastic body leak-proof sanitary napkin is as follows: the core (10) is fitted with the surface layer (20) and the bottom film (30); the leak-proof side (40) includes a leak-proof side body layer (41) and a leak-proof side folded layer (42); the elastic sponge (48) is disposed inside the leak-proof side folded layer (42); the leak-proof side body layer (41) is fitted with the bottom film (30); the leak-proof side folded layer (42) is folded toward the surface layer (20); the leak-proof side folded layer (42) is partially fitted with the surface layer (20) in the middle; and the leak-proof side folded layer (42) is completely fitted with the surface layer (20) at both ends.
[0007] Furthermore, a composite structure of a core-suspended elastic body leak-proof sanitary napkin is provided in which the core (10) is bonded to the surface layer (20), the leak-proof side includes a leak-proof side fold-back layer (43) and a leak-proof side fold layer (42), the elastic sponge (48) is disposed within the leak-proof side fold layer (42), the leak-proof side fold-back layer (43) covers the bottom surface of the core from the side of the core, and a bottom layer is provided between the leak-proof side (40) and the bottom film. The membrane pad (50) is disposed between the core (10) and the bottom membrane pad (50). The inner edge of the leak-proof side fold-back layer (43) is bonded to the bottom membrane pad (50) along its entire length by structural adhesive. The outer edge of the leak-proof side fold-back layer (43) is bonded to the bottom membrane pad (50) at both ends by structural adhesive. The outer edge of the leak-proof side fold-back layer (43) is separated from the bottom membrane pad (50) in the middle.
[0008] Furthermore, in order to achieve a good leak-proof side fold-up effect, the length (S) of the separation section between the leak-proof side fold-back layer (43) and the bottom film pad layer (50) is 0.4 to 0.8 times the total length (L) of the sanitary napkin.
[0009] Furthermore, the bottom membrane pad (50) is a water-repellent fabric.
[0010] The beneficial effects of this utility model are: it adopts elastic leak-proof sides, utilizes the elastic recovery function of elastic sponge to achieve the natural bending of the sanitary napkin as a whole, the leak-proof sides are made of water-repellent fabric commonly used in sanitary napkins, which has a good contact feel with the human body, the naturally bent sanitary napkin is comfortable to wear, has strong side leakage prevention function, and the elastic body-fitting leak-proof sanitary napkin with core suspension structure has greater liquid holding capacity and better body feel.
[0011] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description
[0012] Figure 1This is a structural diagram of the core-fitting elastic adhesive leak-proof sanitary napkin of this utility model;
[0013] Figure 2 This is a side view of the elastic, leak-proof sanitary napkin with a core-fitting structure according to this utility model.
[0014] Figure 3 This is a view of the surface of the elastic, leak-proof sanitary napkin with a core-fitting structure according to this utility model.
[0015] Figure 4 This is a structural disassembly diagram of the elastic, leak-proof sanitary napkin with a core-fitting structure according to this utility model.
[0016] Figure 5 yes Figure 3 AA cross-section view;
[0017] Figure 6 yes Figure 3 BB cross-section;
[0018] Figure 7 This is a 20-view drawing of the surface layer of the elastic, leak-proof sanitary napkin with a core suspension structure according to this utility model;
[0019] Figure 8 yes Figure 7 CC cross-section;
[0020] Figure 9 yes Figure 7 DD cross-section;
[0021] Figure 10 yes Figure 7 EE cross-section;
[0022] Figure 11 yes Figure 9 The FF cross-sectional view shows the position of the structural adhesive on the bottom membrane pad 50. Detailed Implementation
[0023] Example 1:
[0024] like Figures 1 to 6 A core-fitting elastic leak-proof sanitary napkin includes a core 10, a surface layer 20, a bottom film 30, and two leak-proof side panels 40, with elastic sponges inside the leak-proof side panels.
[0025] The core 10 is made of wood pulp, absorbent polymer materials, toilet paper or absorbent paper and other materials through a molding wheel. The core 10 has a strong liquid absorption function.
[0026] The core 10 is disposed between the surface layer 20 and the bottom membrane 30. The surface layer 20 covers the core 10 and is the contact layer with the human body. The core 10 and the surface layer 20 are bonded together with structural adhesive 12, and a flow channel 22 is provided on the surface layer 20. The bottom membrane 30 is also bonded to the core 10 with structural adhesive 13. The area of the bottom membrane 30 is larger than that of the core 10, and the bottom membrane has side wings 32 on both sides of the core.
[0027] Two leak-proof side panels 40 are provided on both sides of the core 10. The leak-proof side panels 40 are made of water-repellent fabric.
[0028] The leak-proof side 40 includes a leak-proof side body layer 41 and a leak-proof side folded layer 42. The leak-proof side body layer 41 has a shape corresponding to the bottom film 30 and has wing edges 44. The leak-proof side folded layer 42 is a 180° fold on the leak-proof side body layer 41, and the leak-proof side folded layer 42 is folded towards the surface layer 20. An elastic sponge 48 is provided inside the leak-proof side folded layer 42. In this embodiment, the elastic sponge is a highly elastic sponge, whose length after stretching is equal to that of the leak-proof side folded layer 42, and the stretch ratio is 130%-200%.
[0029] The elastic sponge 48 is bonded to the leak-proof side folded layer 42 by elastic contraction, using structural adhesive. The leak-proof side folded layer 42 is partially bonded to the surface layer 20 in the middle, and the structural adhesive 21 bonds the leak-proof side folded layer 42 to the edge of the surface layer 20, forming a free edge 42a in the middle of the leak-proof side folded layer 42. The leak-proof side folded layer 42 is fully bonded to the surface layer 20 at both ends.
[0030] The leak-proof side body layer 41 is bonded to the bottom membrane 30 using structural adhesive 33. The leak-proof side body layer 41 and the bottom membrane 30 are bonded in a natural state, i.e., a non-elastic shrinkage bond.
[0031] Due to the elastic contraction of the elastic sponge 48, the overall structure of the sanitary napkin (including the core 10, the surface layer 20, the bottom film 30, and the leak-proof side 40) is bent, with the bending direction towards the surface layer 20, forming a crescent-shaped sanitary napkin.
[0032] When the sanitary napkin is bent, the free edge 42a can be flipped up, so that the leak-proof side fold layer 42 forms a "dam" structure, which can prevent liquid leakage and improve the sanitary napkin's ability to contain liquid.
[0033] This embodiment uses elastic sponge 48, which utilizes the elastic recovery function of elastic sponge 48 to keep the sanitary napkin in a natural curvature. The leak-proof side uses a water-repellent fabric material commonly used in sanitary napkins, which has a good contact feel with the human body, is comfortable to wear, and has a strong anti-leakage function.
[0034] Example 2:
[0035] A method for manufacturing a core-fitting elastic leak-proof sanitary napkin, the method being the manufacturing method of the elastic leak-proof sanitary napkin described in Example 1, the manufacturing method comprising the following steps:
[0036] a. Elastic sponge 48 is stretched elastically on a continuous production line;
[0037] b. Fold the inner edge of the water-repellent fabric to form a leak-proof side fold layer 42, and wrap the elastic sponge 48 inside the leak-proof side fold layer 42. The elastic sponge 48 is bonded and adhered to the leak-proof side fold layer 42 to form a leak-proof side 40 consisting of the leak-proof side body layer 41, the leak-proof side fold layer 42 and the elastic sponge 48.
[0038] c. The surface layer 20 is bonded to the leak-proof side fold layer 42. The leak-proof side fold layer 42 and the surface layer 20 are bonded together with structural adhesive 21, so that the leak-proof side fold layer 42 forms a free edge 42a in the middle.
[0039] d. The core 10 and the surface layer 20 are bonded together with structural adhesive 12. On the working surface of the surface layer 20, a guide groove 22 is formed by rolling with a guide roller.
[0040] e. The bottom film 30 is bonded to the core 10 using structural adhesive 13, thus forming a sanitary napkin structure consisting of the core 10, the surface layer 20, the bottom film 30, and the leak-proof side 40.
[0041] f. The two ends of the sanitary napkin structure are reinforced by composite processes such as hot rolling, ultrasonic bonding, or adhesive bonding to form a circumferential seal 60, and the sanitary napkin structure is cut into the shape of a sanitary napkin.
[0042] The cut sanitary napkin, with its elastic sponge 48 elastically contracting to form a curved (crescent-shaped) shape, has its leak-proof side fold layer 42 fully adhered to the core 10, surface layer 20, and bottom film 30 at both ends' perimeter seals 60. The elastic recovery of the elastic sponge 48 causes the sanitary napkin to bend towards the surface layer, and the free edge 42a in the middle of the leak-proof side fold layer 42 curls up on the surface layer. By adjusting the elastic stretch length of the leak-proof side fold layer 42, sanitary napkins with different degrees of curvature can be obtained.
[0043] Example 3:
[0044] like Figures 7 to 11 A core-suspended structure elastic body leak-proof sanitary napkin is disclosed in this embodiment, which is an improvement on Embodiment 1. It includes a core 10, a surface layer 20, a bottom film 30, and two leak-proof side panels 40. The two leak-proof side panels 40 are disposed on both sides of the core.
[0045] In this embodiment, the core 10 and the surface layer 20 are bonded together with structural adhesive. The leak-proof side 40 includes a leak-proof side fold-back layer 43 and a leak-proof side folded layer 42. The leak-proof side fold-back layer 43 covers the bottom surface of the core from the side of the core. An elastic sponge 48 is provided inside the leak-proof side folded layer 42, and an elastic sponge 48 is provided inside the leak-proof side 40.
[0046] The leak-proof side fold layer 42 folds towards the surface layer 20, and the leak-proof side fold layer 42 is partially attached to the surface layer 20, forming a free edge 42a. The elastic sponge 48 is bonded to the leak-proof side fold layer 42 with structural adhesive through elastic contraction. In its natural state, the elastic sponge 48 will cause the leak-proof side fold layer 42 to contract. Due to the contraction of the leak-proof side fold layer 42, the core 10, the surface layer 20, and the leak-proof side 40 bend, with the bending direction towards the surface layer 20. In this bent state, the free edge 42a can be flipped upwards, such as... Figure 9 As shown.
[0047] A bottom membrane pad 50 is provided between the leak-proof side 40 and the bottom membrane, and a leak-proof side fold-back layer 43 is provided between the core 10 and the bottom membrane pad 50. The bottom membrane pad 50 is made of water-repellent fabric. Since the bottom membrane pad 50 does not require elastic deformation, water-repellent fabric is used for the bottom membrane pad.
[0048] The leak-proof side fold-back layer 43 is bonded to the bottom membrane padding layer 50 using structural adhesive. The inner edge of the leak-proof side fold-back layer 43 is bonded to the bottom membrane padding layer 50 along its entire length (L) using structural adhesive 45, and the outer edge of the leak-proof side fold-back layer 43 is bonded to the bottom membrane padding layer 50 at both ends using structural adhesive 46. Figure 9 , Figure 11 As shown. The outer edge of the leak-proof side fold-back layer 43 separates from the bottom membrane pad 50 in the middle (it is not attached to the bottom membrane pad 50). When the core 10, the surface layer 20, and the leak-proof side 40 bend, the outer part of the leak-proof side fold-back layer 43 in the middle (S section) can be folded up on the bottom membrane pad 50, so that the core 10, the two sides of the surface layer 20, and the leak-proof side 40 form a suspended part 47, as shown. Figure 10 As shown. Due to the elastic contraction of the elastic sponge 48, the closer the suspended part 47 is to the center of the sanitary napkin, the greater its folding amount. The length S of the separation section S of the outer side of the leak-proof side fold-back layer 43 in the middle is 0.4 to 0.8 times the total length L.
[0049] The bottom membrane pad 50 is divided into two pieces, each bottom membrane pad 50 corresponding to a leak-proof side 40. The bottom membrane pad 50 and the bottom membrane 30 are bonded together with structural adhesive.
[0050] In this embodiment, the core suspension structure elastic fit leak-proof sanitary napkin has a "double dam" structure formed by the free edge 42a and the suspension part 47 on the leak-proof side under the bending action of the sanitary napkin, which has a better side leakage prevention effect.
[0051] Example 4:
[0052] A method for manufacturing a core-suspended structure elastic fit leak-proof sanitary napkin, the method being the method for manufacturing the core-suspended structure elastic fit leak-proof sanitary napkin described in Example 3, the steps of the manufacturing method including:
[0053] a. Elastic sponge 48 is stretched elastically on a continuous production line;
[0054] b. Fold the inner side of the water-repellent fabric, which serves as the leak-proof side 40, to form a leak-proof side folded layer 42. Wrap the elastic sponge 48 inside the leak-proof side folded layer 42, and bond the elastic sponge 48 to the leak-proof side folded layer 42.
[0055] c. The surface layer 20 is bonded to the leak-proof side fold layer 42. The leak-proof side fold layer 42 and the surface layer 20 are bonded together with structural adhesive 21, so that the leak-proof side fold layer 42 forms a free edge 42a in the middle.
[0056] d. The core 10 and the surface layer 20 are bonded together with structural adhesive 12. On the working surface of the surface layer 20, a guide groove 22 is formed by rolling with a guide roller.
[0057] e. The outer edge of the water-repellent fabric, which serves as the leak-proof side 40, is wrapped from the side of the core to the bottom surface of the core to form a leak-proof side fold-back layer 43.
[0058] f. The leak-proof side fold-back layer 43 is bonded to the bottom membrane pad 50 with structural adhesive. The inner edge of the leak-proof side fold-back layer 43 is bonded to the bottom membrane pad 50 along its entire length (L) with structural adhesive 45. The outer edge of the leak-proof side fold-back layer 43 is bonded to the bottom membrane pad 50 at both ends with structural adhesive 46. The outer edge of the leak-proof side fold-back layer 43 is separated from the bottom membrane pad 50 in the middle (S section) (and is not bonded to the bottom membrane pad 50).
[0059] g. The bottom film pad 50 and the bottom film 30 are bonded together with structural adhesive 51, thus forming a sanitary napkin structure composed of core 10, surface layer 20, bottom film 30, leak-proof side 40 and bottom film pad 50.
[0060] h. The two ends of the sanitary napkin structure are reinforced by composite processes such as hot rolling, ultrasonic bonding, or adhesive bonding to form a circumferential seal 60. The sanitary napkin structure is then cut into the shape of a sanitary napkin, such as... Figure 7 As shown.
[0061] This completes the manufacturing of the core-suspended structure elastic body leak-proof sanitary napkin. In the manufactured sanitary napkin, the two elastic sponges 48 will elastically contract relative to the sanitary napkin structure (including the core 10, the surface layer 20, the bottom film 30, the leak-proof side 40, and the bottom film pad 50) to form a curved (crescent-shaped) sanitary napkin. The free edge 42a of the leak-proof side fold layer 42 in the middle is raised on the surface layer, and the suspended part 47 of the leak-proof side is also raised from the bottom film pad 50.
[0062] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred arrangements, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model (such as connection methods, shapes of various elements, etc.) without departing from the spirit and scope of the technical solution of this utility model.
Claims
1. An elastic, leak-proof sanitary napkin, comprising a core (10), a surface layer (20), and a bottom film (30), wherein the core is disposed between the surface layer and the bottom film, characterized in that, The core (10) has leak-proof sidewalls (40) on both sides, and elastic sponge (48) is provided inside the leak-proof sidewalls (40). The leak-proof sidewalls (40) are attached to the surface layer (20) and the bottom film (30). The core, surface layer, bottom film and leak-proof sidewalls are bent toward the surface layer.
2. The elastic, leak-proof sanitary napkin according to claim 1, characterized in that, The leak-proof side (40) is a leak-proof side made of water-repellent fabric. The elastic sponge (48) is attached to the leak-proof side (40) by elastic stretching. After the elastic sponge shrinks, the leak-proof side (40), the surface layer (20), and the bottom film (30) bend towards the surface layer.
3. The elastic, leak-proof sanitary napkin according to claim 1, characterized in that, The core (10) is bonded to the surface layer (20) and the bottom film (30). The leak-proof side (40) includes a leak-proof side body layer (41) and a leak-proof side folded layer (42). The elastic sponge (48) is disposed inside the leak-proof side folded layer (42). The leak-proof side body layer (41) is bonded to the bottom film (30). The leak-proof side folded layer (42) is folded toward the surface layer (20). The leak-proof side folded layer (42) is partially bonded to the surface layer (20) in the middle. The leak-proof side folded layer (42) is completely bonded to the surface layer (20) at both ends.
4. The elastic, leak-proof sanitary napkin according to claim 1, characterized in that, The core (10) is attached to the surface layer (20). The leak-proof side includes a leak-proof side fold-back layer (43) and a leak-proof side fold layer (42). The elastic sponge (48) is disposed inside the leak-proof side fold layer (42). The leak-proof side fold-back layer (43) covers the bottom surface of the core from the side of the core. A bottom film pad layer (50) is provided between the leak-proof side (40) and the bottom film. The fold-back layer (43) is disposed between the core (10) and the bottom membrane pad (50). The inner edge of the leak-proof side fold-back layer (43) is bonded to the bottom membrane pad (50) along its entire length by structural adhesive. The outer edge of the leak-proof side fold-back layer (43) is bonded to the bottom membrane pad (50) at both ends by structural adhesive. The outer edge of the leak-proof side fold-back layer (43) is separated from the bottom membrane pad (50) in the middle.
5. The elastic, leak-proof sanitary napkin according to claim 4, characterized in that, The length (S) of the separation section between the leak-proof side fold-back layer (43) and the bottom film pad layer (50) is 0.4 to 0.8 times the total length (L) of the sanitary napkin.
6. The elastic, leak-proof sanitary napkin according to claim 4, characterized in that, The bottom membrane pad (50) is a water-repellent fabric.