A sanitary napkin having no adhesive surface layer

Abstract

The utility model discloses a kind of sanitary napkin without glue surface layer, from top to bottom are sequentially provided with wing, surface layer, flow guide layer, absorbent core and bottom film, the absorbent core and bottom film are bonded by hot melt adhesive, the surface layer and flow guide layer are compounded by ultrasonic wave, the wing and surface layer lap joint portion are compounded by ultrasonic wave, the wing and bottom film connecting surface are bonded by hot melt adhesive;The surface layer and flow guide layer are compounded by ultrasonic wave point, uniformly form multiple bubble area, the bubble interval constitutes breathable channel, bubble has bubble gap between the surface layer and flow guide layer. Avoid the firmness of surface layer and flow guide layer deficiency and delamination displacement, prevent adhesive to affect softness, eliminate hot melt adhesive penetration allergy, improve health safety. Meanwhile, using bubble welding mode, keep surface layer fluffy and breathable, improve wearing comfort, simplify production link, shorten production cycle, improve yield.

Description

Technical Field

[0001] This utility model relates to the field of feminine hygiene products, and in particular to a non-adhesive-coated sanitary napkin. Background Technology

[0002] As a commonly used hygiene product for women during menstruation, sanitary napkins come into direct contact with the skin of the intimate area, making their safety, comfort, and environmental friendliness paramount. The product must efficiently absorb menstrual blood while avoiding skin irritation and ensuring a soft, skin-friendly feel. Currently, hot melt adhesive spraying is commonly used for bonding the surface layer and the distribution layer of sanitary napkins. This process involves heating and atomizing hot melt adhesive, spraying it between the two layers, and then allowing it to cool and solidify to achieve adhesion. However, this method has significant drawbacks: First, the hot melt adhesive hardens after drying, reducing the softness of the bonded area and affecting wearing comfort. Second, the loose and breathable surface layer is easily permeated, and the hot melt adhesive comes into direct contact with the skin, significantly increasing the risk of allergies. Third, the spraying process is difficult to control precisely; uneven spraying not only leads to unstable bonding strength, causing delamination and displacement, but also wastes raw materials and increases production costs. Furthermore, the production of chemical adhesives is energy-intensive, and they are difficult to degrade after disposal, which is detrimental to environmental protection. Utility Model Content

[0003] To address the aforementioned issues, this utility model provides a non-adhesive surface sanitary napkin that improves comfort throughout the entire use of the sanitary napkin, simplifies the production process, and is more environmentally friendly.

[0004] This utility model is implemented as follows: A non-adhesive sanitary napkin comprises, from top to bottom, wings, a top layer, a diversion layer, an absorbent core, and a bottom film. The absorbent core and the bottom film are bonded together with hot melt adhesive. The top layer and the diversion layer are bonded together by ultrasonic waves. The overlapping portion of the wings and the top layer is bonded together by ultrasonic waves. The connecting surface of the wings and the bottom film is bonded together by hot melt adhesive. The top layer and the diversion layer are bonded together by ultrasonic point-like bonding to uniformly form multiple bubble areas. The bubbles form breathable channels, and there are bubble gaps between the top layer and the diversion layer.

[0005] Furthermore, the overlap between the protective wing and the outer layer is welded near the inner side of the outer layer using ultrasonic dot-line welding, and on the outer side using ultrasonic dot-curved welding.

[0006] Furthermore, the diameter of the bubble is 5-10 mm.

[0007] Furthermore, the diameter of the welding point is 0.5-1.5 mm, and the spacing between the welding points is 0.5-1.5 mm.

[0008] Furthermore, the protective wings and the surface layer are ultrasonically bonded together to form a three-piece composite consisting of two protective wings and one surface layer.

[0009] Furthermore, the overlap between the protective wing and the outer layer is between 5-15mm.

[0010] The beneficial effects of this invention are as follows: The sanitary napkin uses ultrasonic bonding to fuse the overlapping parts of the wings and top layer that come into direct contact with the skin, as well as the top layer and the distribution layer. Hot melt adhesive is used to bond the wings, bottom film, absorbent core, and bottom film that do not come into contact with the skin. This avoids insufficient strength and delamination of the top and distribution layers, prevents the adhesive from affecting softness, eliminates allergies caused by hot melt adhesive penetration, and improves hygiene and safety. Simultaneously, the use of bubble welding maintains the top layer's fluffiness and breathability, improving wearing comfort, simplifying the production process, shortening the production cycle, and increasing output.

[0011] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the adhesive-free sanitary napkin of this utility model; Figure 2 This is a cross-sectional schematic diagram of the layered structure of the adhesive-free sanitary napkin of this utility model; Figure 3 This is a schematic diagram of the welding points of the overlapping part of the adhesive-free sanitary napkin wings and the surface layer of this utility model; Figure 4 This is a schematic diagram of the welding points of the surface layer and the diversion layer of the adhesive-free sanitary napkin of this utility model; Figure 5 This is a partially enlarged schematic diagram of part A of the adhesive-free sanitary napkin surface layer of this utility model.

[0013] In the diagram: 1. Wing, 2. Top layer, 3. Guide layer, 4. Absorbent core, 5. Hot melt adhesive, 6. Bottom membrane, 7. Ventilation channel, 8. Bubble gap, 9. Bubble, 10. Welding point. Detailed Implementation

[0014] This embodiment describes a non-adhesive-coated sanitary napkin, such as... Figure 1-5 As shown, the structure consists of multiple layers, arranged from top to bottom as follows: protective wings 1, surface layer 2, flow guiding layer 3, absorbent core 4, and bottom membrane 6. The absorbent core 4 and bottom membrane 6 are bonded together with hot melt adhesive 5. The surface layer 2 and flow guiding layer 3 are combined using an ultrasonic dot-matrix composite process, uniformly forming multiple bubble areas 9 with a diameter of 5-10 mm. The welding points 10 between the bubbles 9 form air permeable channels 7. There are also bubble gaps 8 between the surface layer 2 and the flow guiding layer 3, thereby effectively improving air permeability and flow guiding effect.

[0015] The ventilation channels 7, bubbles 9, and bubble gaps 8 work together to significantly improve product performance. The ventilation channels 7, formed by the spaced bubbles 9, create a continuous airflow path, effectively promoting air exchange between the inside and outside of the sanitary napkin. This dissipates heat and moisture generated during use, reducing stuffiness in the intimate area, minimizing bacterial growth, and maintaining a dry and clean environment, significantly improving user comfort and health. The bubbles 9, created using an ultrasonic composite process between the surface layer 2 and the distribution layer 3, form a three-dimensional structure. This effectively disperses liquid impact, accelerates liquid flow, and reduces the contact area between the surface layer 2 and the skin, preventing skin friction and discomfort from prolonged use. This provides both drainage and comfort. The bubble gaps 8 provide temporary liquid storage space between the surface layer 2 and the distribution layer 3. When liquid contacts the surface layer 2, it quickly permeates through the bubble gaps 8 into the distribution layer 3 and the absorbent core 4, accelerating the liquid's absorption rate, reducing backflow, ensuring the surface layer remains dry, and further enhancing the absorbency and reliability of the sanitary napkin.

[0016] The overlap between the wings 1 and the top layer 2 also employs ultrasonic bonding. The inner part near the top layer 2 uses ultrasonic dot-matrix straight-line welding, while the outer part uses ultrasonic dot-matrix curved welding. The connecting surfaces of the wings 1 and the bottom film 5 are bonded with hot melt adhesive 5. The diameter of the welding points 10 is controlled between 0.5-1.5mm, and the spacing between each welding point 10 is maintained at 0.5-1.5mm to ensure a strong connection without affecting the overall softness and comfort of the sanitary napkin. This structural design not only reduces the use of glue and lowers the risk of allergies, but also optimizes breathability, flow guidance, and leak prevention through the ultrasonic bonding process.

[0017] This utility model discloses a method for the production process of a non-adhesive surface layer sanitary napkin, including the ultrasonic composite protective wings 1—surface layer 2 and surface layer 2—guide layer 3: Step 1: Cut the water-repellent fabric into water-repellent wing strips of the required width; Step 2: Fold the two fabric strips and attach them to the upper sides of the surface layer 2, with an overlap of 5-15mm. Step 3: Using ultrasonic equipment, the surface layer 2 is bonded to the overlapping portion of the folded water-repellent fabric, forming a three-piece composite consisting of two protective wings 1 and one surface layer 2, as shown below. Figure 3 As shown; Step 4: The flow guide layer 3 is completely bonded to the non-use surface of the surface layer 2; Step 5: Combine the three-piece composite with the flow guide layer using an ultrasonic device.

[0018] This invention balances structural strength, skin-friendly experience, production efficiency, and material compatibility through a combination of ultrasonic composite and flexible hot melt adhesive. It is particularly suitable for the requirements of sanitary napkins for "safety, thinness, breathability, and deformation resistance," and avoids the limitations of a single process. It breaks through the limitation that ultrasonic welding is only applicable to thermoplastic materials, and reduces the risk of allergies and material hardening problems that may be caused by the large-area use of hot melt adhesive. It is an optimized solution that takes into account both product performance and production cost.

[0019] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Although this utility model has been described in detail with reference to the preferred arrangement, 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 the connection method, the shape of each element, etc.) without departing from the spirit and scope of the technical solution of this utility model.

Claims

1. A non-adhesive surface sanitary napkin, comprising, from top to bottom, wings (1), a surface layer (2), a diversion layer (3), an absorbent core (4), and a bottom film (6), characterized in that, The absorbent core (4) and the bottom membrane (6) are bonded together with hot melt adhesive (5), the surface layer (2) and the flow guiding layer (3) are bonded together by ultrasonic waves, the overlapping part of the protective wing (1) and the surface layer (2) is bonded together by ultrasonic waves, and the connecting surface of the protective wing (1) and the bottom membrane (6) is bonded together with hot melt adhesive (5); the surface layer (2) and the flow guiding layer (3) are bonded together by ultrasonic point bonding to uniformly form multiple bubble (9) areas, the bubbles (9) form a breathable channel (7), and the bubbles (9) have bubble gaps (8) between the surface layer (2) and the flow guiding layer (3).

2. The adhesive-free sanitary napkin according to claim 1, characterized in that, The overlapping part of the protective wing (1) and the surface layer (2) is close to the inner side of the surface layer and is welded by ultrasonic point-line straight welding, while the outer side is welded by ultrasonic point-curved welding.

3. The adhesive-free sanitary napkin according to claim 1, characterized in that, The diameter of the bubble (9) is 5-10 mm.

4. The adhesive-free sanitary napkin according to claim 2, characterized in that, The diameter of the welding point (10) formed by the ultrasonic point linear welding and / or ultrasonic point curved welding is 0.5-1.5 mm, and the spacing between the welding points (10) is 0.5-1.5 mm.

5. The adhesive-free sanitary napkin according to claim 1, characterized in that, The protective wing (1) and the surface layer (2) are combined by ultrasonic waves to form a three-piece composite consisting of two protective wings (1) and one surface layer (2).

6. The adhesive-free sanitary napkin according to claim 1 or 5, characterized in that, The overlap between the protective wing (1) and the outer layer (2) is between 5-15mm.

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