Skin-friendly sanitary towel structure and production and preparation process thereof

Abstract

The invention relates to the technical field of hygienic products, and provides a skin-friendly sanitary napkin structure and a production and preparation technology thereof.The skin-friendly sanitary napkin structure comprises a hot air non-woven fabric layer, an absorption core layer and a breathable water-repellent bottom which are sequentially arranged from the side close to the skin to the outside; the absorption core layer comprises an anti-reverse osmosis membrane, a first absorption core, a second absorption core and a non-woven fabric wrapping layer which are sequentially arranged from the near-skin side to the outside, a plurality of flow guide grooves are formed in the first absorption core in a penetrating mode, and drainage parts extending towards the side edge of the first absorption core are locally arranged on the flow guide grooves; the first absorption core and the non-woven fabric wrapping layer are bonded and fixed through an ultrasonic composite technology to form a first bonding area, and the first bonding area is located on the side edge of the absorption core layer and the position of the flow guide groove; and at the moment, the first absorption core and the second absorption core are freely propped against each other. On the basis, the sanitary napkin can keep enough absorbing capacity and is durable while the dry, comfortable, breathable and skin-friendly instant absorbing effects of the sanitary napkin are considered, and the use experience of women is optimized.

Description

Technical Field

[0001] The present application relates to the technical field of sanitary products, and in particular to a skin-friendly sanitary napkin structure and its production process. Background Art

[0002] Sanitary napkins are a type of high-molecular-weight polymer and high-molecular-weight polymer composite paper formed by a composite of multiple materials. They are mainly used as sanitary products for women during their menstrual period to absorb menstrual blood and keep private parts clean and comfortable.

[0003] In the related art, the surface material of sanitary napkins is mostly made of hot air non-woven fabric. Hot air non-woven fabric has the advantages of being soft to the touch and having good permeability, which can make sanitary napkins both skin-friendly and quick-drying. However, the fiber structure of hot air non-woven fabric is loose. Although it absorbs moisture quickly, its water-locking ability is weak. If the menstrual blood is not locked in the lower absorbent core in time after being absorbed, it may cause back-seepage due to external forces and contaminate the surface layer. It may even cause stuffiness or side leakage due to back-seepage. If the dryness and breathability of the sanitary napkin need to be taken into account, the lower absorbent core will often adopt a thin design. In this case, the sanitary napkin has a small absorption capacity. After women use it for a period of time, it may leak, and the sanitary napkin needs to be changed frequently, which affects the user experience and needs to be improved. Summary of the Invention

[0004] Based on this, the present application provides a skin-friendly sanitary napkin structure and its production and preparation process, which can take into account the dryness and breathability of the sanitary napkin and the skin-friendly instant absorption effect while allowing the sanitary napkin to maintain sufficient absorption capacity, be durable, and optimize the usage experience of women.

[0005] In the first aspect, the present application provides a skin-friendly sanitary napkin structure adopting the following technical solutions: A skin-friendly sanitary napkin structure comprises a hot air non-woven fabric layer, an absorbent core layer and a breathable and water-repellent bottom layer arranged in sequence from the skin-near side to the outside. Side wings are provided on both side edges of the breathable and water-repellent bottom layer. The backs of the side wings are provided with a backing adhesive layer and bonded with release paper. The absorbent core layer includes an anti-reverse osmosis membrane, a first absorbent core, a second absorbent core, and a non-woven fabric wrapping layer, which are arranged in sequence from the skin-near side to the outside. The first absorbent core is provided with a plurality of guide grooves, each of which extends in the same direction as the first absorbent core, and a drainage portion extending toward the side of the first absorbent core is partially provided in the guide groove. The first absorbent core and the non-woven fabric wrapping layer are bonded and fixed by an ultrasonic composite process to form a first bonding area, which is located at the side edge of the absorbent core layer and the guide groove position; at this time, the first absorbent core and the second absorbent core are freely abutted.

[0006] By adopting the above-mentioned technical solution, when the sanitary napkin of the present application is in use, the hot air non-woven fabric layer contacts the skin and can have a soft touch, skin-friendly and comfortable; after the liquid penetrates downward through the hot air non-woven fabric layer, it passes through the anti-reverse osmosis membrane to lock in water, which can prevent the liquid from seeping back, thereby keeping the genital environment clean; at the same time, the liquid that penetrates into the first absorption core can be quickly absorbed by the first absorption core and penetrate downward to the second absorption core, and can also quickly diffuse outward along the guide groove and drainage part on the first absorption core and be absorbed by the second absorption core on the lower layer, with extremely strong instantaneous absorption and water-locking effects; the design of the double-layer absorption core can increase the liquid absorption capacity and is durable.

[0007] In addition, because the first absorbent core and the second absorbent core are partially bonded, relative displacement can occur between the first absorbent core and the second absorbent core when a woman exercises, thereby promoting rapid air flow between the two, which is beneficial for maintaining the dryness and breathability of the sanitary napkin. The absorbent core layer produced by ultrasonic bonding has the advantage of strong bonding, while also reducing the thickness of the cotton soft surface layer, thereby obtaining a thin sanitary napkin. In summary, the sanitary napkin of the present application can achieve both dryness and breathability of the sanitary napkin and the skin-friendly instant absorption effect, while maintaining sufficient absorption capacity, being durable, and optimizing the user experience of women.

[0008] Optionally, the second absorbent core includes a SAP core and two layers of cotton soft surface layers, the two layers of cotton soft surface layers are ultrasonically composite bonded to form multiple spacing areas, each spacing area is equidistantly arranged, and the SAP core is sprayed on the inside of each spacing area.

[0009] By adopting the above technical solution, the choice of a soft cotton surface layer meets the requirements of a sanitary napkin structure for dryness, breathability, and instant absorption. The SAP core significantly increases the absorbent core's absorption capacity, making the sanitary napkin more durable. Furthermore, by arranging the SAP core in multiple compartments, the volume of each compartment is reduced, which helps to reduce the SAP core's swelling after absorbing liquid, ensuring comfortable use.

[0010] Optionally, a first embossed surface is provided on the side of the first absorbent core close to the second absorbent core, and a second embossed surface is provided on the side of the second absorbent core close to the first absorbent core. The first convex circle on the surface of the first embossed surface and the second convex circle on the surface of the second embossed surface are normally staggered.

[0011] By adopting the above-mentioned technical solution, by staggering the first convex circle and the second convex circle under normal conditions, it is possible to ensure a close fit between the first absorbent core and the second absorbent core, and maintain the thin setting of the sanitary napkin; and when the sanitary napkin is in use, the first absorbent core and the second absorbent core undergo relative displacement when a woman walks, and the abutment guidance of the first convex circle and the second convex circle is helpful in pushing the first absorbent core and the second absorbent core away from each other, which in turn helps to accelerate the air flow inside the sanitary napkin, take away moisture and keep the sanitary napkin dry and comfortable.

[0012] Optionally, a second bonding area is formed between the breathable and water-repellent bottom layer and the absorbent core layer, and a suspended structure is formed between the absorbent core layer and the breathable and water-repellent bottom layer outside the second bonding area.

[0013] By adopting the above-mentioned technical solution, the suspended structure design can keep the absorption core layer in close contact with the female hip curve, reduce the direct contact and friction between the breathable and water-repellent bottom and the skin, improve the comfort of using the sanitary napkin, and help improve the side leakage phenomenon.

[0014] Optionally, two arcuate edges are formed at the junction of the suspended structure and the second bonding area, the two arcuate edges are set at an angle and the endpoints intersect; the arc centers of the two arcuate edges are respectively located at the front and rear ends of the sanitary napkin structure.

[0015] By adopting the above-mentioned technical solution, by designing the shape of the second bonding area, two arc-shaped edges with intersecting endpoints are formed at the junction of the suspended structure and the second bonding area. The divergent arrangement of the two arc-shaped edges can always have the tendency to force the absorbent core layer to bulge upward and fit the skin, further eliminating the occurrence of side leakage.

[0016] In a second aspect, the present application provides a production process for the above-mentioned skin-friendly sanitary napkin structure, comprising the following steps: Step S1, preparing pure cotton fabric, cutting the pure cotton fabric into multiple cotton soft surface layers by a cutting mechanism, and making multiple marking areas on the cotton soft surface layers; Step S2: Lay the cotton soft surface layer flat with the marked area facing upward, and then evenly spray the SAP core on each marked area; Step S3, laminating another cotton soft surface layer onto the original cotton soft surface layer, flattening the two cotton soft surface layers and locally bonding them using a first ultrasonic laminating mechanism to produce a second absorbent core; Step S4: placing the non-woven fabric wrapping layer on the working station of the forming equipment, and then placing the first absorbent core and the second absorbent core in sequence on the non-woven fabric wrapping layer. A negative pressure mechanism is provided at the bottom of the working station. The negative pressure suction generated by the negative pressure mechanism forces the surface layers of the absorbent core layer to maintain close contact. The absorbent core layer enters the second ultrasonic laminating mechanism for bonding and fixing, and the bonding position of the absorbent core layer is located at the guide groove and the side edge of the absorbent core layer. Step S5, stacking the anti-reverse osmosis membrane and the hot air non-woven fabric layer on the surface of the absorbent core layer in sequence, and the surface layers enter the third ultrasonic laminating mechanism for bonding to obtain a semi-finished product; Step S6, inverting the semi-finished product with the non-woven fabric wrapping layer facing upward, and then pressing the breathable and water-repellent bottom layer onto the surface of the non-woven fabric wrapping layer, and both of them enter the fourth ultrasonic laminating mechanism for bonding; Step S7: Apply glue to the side wings and stick release paper; Step S8, folding the package.

[0017] By adopting the above technical solution, the sanitary napkin prepared by steps S1-S8 can take into account the dryness and breathability of the sanitary napkin and the skin-friendly instant absorption effect while maintaining sufficient absorption capacity, being durable and optimizing the user experience of women.

[0018] Optionally, in step S4, the outer peripheral size of the non-woven fabric wrapping layer is larger than the outer peripheral size of the second absorbent core, thereby forming an extended surrounding portion; when the first absorbent core is placed on the second absorbent core, the extended surrounding portion wraps around the side edge of the first absorbent core away from the second absorbent core.

[0019] By adopting the above technical solution, the setting of the extended surrounding part can strengthen the fixation of the first absorbent core and the second absorbent core, reduce the possibility of accidental separation of the first absorbent core and the second absorbent core during use, and thus reduce the possibility of accidental side leakage.

[0020] Optionally, in step S4, the first absorbent core and the second absorbent core need to undergo pre-processing, wherein the first absorbent core needs to pass through a double-sided embossing machine to form double-sided embossing, and then needs to be partially cut by a cutting mechanism to form a guide groove; the second absorbent core needs to pass through a single-sided embossing machine to form single-sided embossing, and when the second absorbent core is placed on the non-woven fabric wrapping layer, the single-sided embossing of the second absorbent core faces upward.

[0021] By adopting the above-mentioned technical solution, the first absorbent core is embossed on both sides, one layer of embossing is used to cooperate with the embossing of the surface layer of the first absorbent core to enhance the breathability effect, and the embossing on the other side is used to lock larger volumes of dirt such as blood clots between the convex gaps of the embossed layer when the liquid penetrates into the absorbent core layer, thereby ensuring the cleanliness and dryness of the surface of the hot air non-woven fabric layer, which is conducive to the hygiene and health of the genital environment.

[0022] Optionally, the molding device in step S4 includes an equipment body and a second ultrasonic compound mechanism provided on the equipment body, the equipment body is slidably provided with a station base plate, and the station base plate is driven and connected to a linear drive member; a limiting mold frame is detachably fixed on the top of the station base plate, and the inner shape of the limiting mold frame is adapted to the shape of the first absorbent core; The surface of the station base plate is provided with a plurality of negative pressure holes, each of which is directly opposite to the inner area of ​​the limit mold frame; a negative pressure chamber is provided at the bottom of the station base plate, and each negative pressure hole is connected to the negative pressure chamber; the bottom of the negative pressure chamber is connected to an air intake pipe, and the end of the air intake pipe away from the negative pressure chamber is connected to the negative pressure mechanism; The station substrate is provided with a vertically arranged guide column, and a side guide block is provided on the side of the second ultrasonic composite mechanism. The side guide block has a guide groove. When the linear drive member is activated, the station substrate moves to a position where the guide column and the guide groove are opposite.

[0023] By adopting the above-mentioned technical solution, the setting of the limiting mold frame is used to accurately position and place the first absorbent core and the second absorbent core, and the first absorbent core and the second absorbent core after placement can maintain close fit and precise positioning under the negative pressure suction of the negative pressure mechanism; then, the linear drive member is actuated to force the work station substrate to move toward the position of the second ultrasonic composite mechanism, and the work station substrate finally stays at a position opposite to the guide groove. At this time, the cooperation of the guide column and the guide groove can achieve precise bonding of the absorbent core layer, ensuring that the bonding position of the absorbent core layer is located at the guide groove and the side edge of the absorbent core layer.

[0024] Optionally, the second ultrasonic composite structure includes an ultrasonic die head, the shape of which is adapted to the shape of the absorbent core layer; a first forming part and a second forming part are protruding from the surface of the ultrasonic die head, the first forming part is arranged around the peripheral edge of the ultrasonic die head, and the second forming part is located in the middle of the ultrasonic die head, and the shape of the second forming part is adapted to the shape of the guide groove.

[0025] By adopting the above-mentioned technical solution, by setting the first molding part and the second molding part, with the cooperation of the guide column and the guide groove, the second molding part can be precisely aligned with the guide groove, and the first molding part can be precisely aligned with the peripheral edge of the absorption core layer, so as to achieve smooth bonding and compounding of the absorption core layer.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The double-layer absorbent core design can increase the liquid absorption capacity. Liquid that penetrates into the first absorbent core can be quickly absorbed by the first absorbent core and penetrate downward to the second absorbent core. It can also quickly diffuse outward along the guide grooves and drainage parts on the first absorbent core and be absorbed again by the second absorbent core below, with extremely strong instant absorption and water-locking effects. 2. By partially bonding the first absorbent core to the second absorbent core, relative displacement can occur between the first absorbent core and the second absorbent core during exercise, thereby promoting rapid air flow between the two, which is beneficial to keeping the sanitary napkin dry and breathable; 3. The absorbent core layer is made by ultrasonic bonding, which can make the absorbent core layer have the advantage of strong bonding, while also reducing the thickness of the cotton soft surface layer, thereby obtaining a thin sanitary napkin; 4. By staggering the first and second convex circles in a normal state, a close fit between the first and second absorbent cores can be ensured, maintaining the thinness of the sanitary napkin. When the sanitary napkin is in use, the contact and guidance between the first and second convex circles facilitates the separation of the first and second absorbent cores, further accelerating air flow inside the sanitary napkin, removing moisture and maintaining a dry and comfortable feel. 5. By designing the shape of the second adhesive area, the junction of the suspended structure and the second adhesive area forms two intersecting arcuate edges. These diverging arcuate edges force the absorbent core layer to concave upward and conform to the skin, improving the comfort of the sanitary napkin and significantly reducing side leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a front view of the overall structure in Example 1; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 is a front view of the first absorbent core in Example 1; Figure 4 Schematic diagram of the layer structure of the first absorbent core and the second absorbent core in Example 1; Figure 5 Schematic diagram of the layer structure of the bonding position of the first absorbent core, the second absorbent core and the anti-reverse osmosis membrane in Example 1; Figure 6 is a back view of the overall structure in Example 1; Figure 7 is a flow chart of the production process in Example 2; Figure 8 It is a schematic diagram of the partial structure of the molding equipment in Example 2; Figure 9 2 is a schematic diagram of a half-section structure of a workstation substrate in Example 2; Figure 10 Schematic diagram of the structure of the ultrasonic die head in Example 2.

[0028] Explanation of reference numerals: 1. hot air non-woven fabric layer; 2. absorbent core layer; 21. anti-reverse osmosis membrane; 22. first absorbent core; 221. guide groove; 222. drainage part; 223. first embossed surface; 224. third embossed surface; 23. second absorbent core; 231. second embossed surface; 24. cotton soft surface layer; 241. spacing area; 25. SAP core; 26. non-woven fabric wrapping layer; 261. extension surrounding part; 27. first bonding area; 3. breathable and water-repellent Bottom; 31. Side wings; 32. Second bonding area; 33. Suspended structure; 34. Arc-shaped edge; 4. Molding equipment; 5. Equipment body; 51. Work station base plate; 511. Negative pressure hole; 512. Negative pressure chamber; 513. Air inlet pipe; 514. Guide column; 52. Linear drive member; 53. Limiting mold frame; 6. Second ultrasonic composite mechanism; 61. Ultrasonic die head; 62. First molding part; 63. Second molding part; 64. Side guide block; 641. Guide groove. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1 -Attached Figure 9 This application is described in further detail. Example 1

[0030] The embodiment of the present application discloses a skin-friendly sanitary napkin structure.

[0031] Reference Figure 1 A skin-friendly sanitary napkin structure comprises, arranged in order from the skin-facing side toward the outside, a hot air nonwoven fabric layer 1, an absorbent core layer 2, and a breathable and water-repellent backing layer 3. Each layer is bonded to the other using an ultrasonic composite bonding process. The breathable and water-repellent backing layer 3 is made of a polyethylene microporous breathable film, which is breathable but not water-permeable. Side wings 31 are provided on either side of the backing of the breathable and water-repellent backing layer 3, each integrally formed with the backing. The backs of the side wings 31 are coated with glue to form an adhesive layer, through which a release paper liner (not shown) is bonded.

[0032] Reference Figure 2 The absorption core layer 2 includes an anti-reverse osmosis membrane 21, a first absorption core 22, a second absorption core 23 and a non-woven fabric wrapping layer 26, which are arranged in sequence from the skin-friendly side to the outside. Among them, the anti-reverse osmosis membrane 21 uses a double-lined guide non-woven fabric. The double-lined guide non-woven fabric has the function of guiding and isolating moisture. It can not only guide the liquid to diffuse quickly, but also improve the situation of liquid reverse osmosis to the hot air non-woven fabric layer 1, ensuring that the skin-friendly part of the sanitary napkin is dry and comfortable.

[0033] Reference Figure 3The first absorbent core 22 is a cotton soft surface layer 24 made of pure cotton, which has the characteristics of breathability and moisture absorption; a through guide groove 221 is provided on the surface of the first absorbent core 22, and the number of the guide grooves 221 is multiple. In the embodiment of the present application, the number of the guide grooves 221 is specifically 2, and all the guide grooves 221 are arranged side by side, and the extension direction of each guide groove 221 is arranged in the same direction as the extension direction of the first absorbent core 22.

[0034] It is understood that in other possible implementations, the number of guide grooves 221 can also be 3, 4, or 5, and is not limited to the number shown in this embodiment. In addition, each guide groove 221 is partially provided with a plurality of drainage portions 222, and the drainage portions 222 extend toward the sides of the first absorbent core 22; the configuration of the guide grooves 221 and the drainage portions 222 can enhance the diffusion rate and absorption rate of the liquid, thereby optimizing the instantaneous absorption effect of the sanitary napkin.

[0035] Reference Figure 4 The second absorbent core 23 includes a SAP core 25 and two layers of cotton soft surface layers 24. The two layers of cotton soft surface layers 24 are bonded together by ultrasonic composite bonding. The bonding locations are located at the peripheral edges of the two layers of cotton soft surface layers 24 and in the local area spaced between the two layers of cotton soft surface layers 24. The two layers of cotton soft surface layers 24 are formed by ultrasonic composite bonding to form multiple spacing areas 241. In this embodiment, the spacing areas 241 are equidistantly spaced, and the SAP core 25 is evenly sprayed on the inside of each spacing area 241. The provision of the SAP core 25 is used to increase the amount of liquid absorbed by the second absorbent core 23, thereby improving the absorption performance of the sanitary napkin and making it durable. The regional arrangement can also reduce the occurrence of pilling and clumping of the SAP core 25 after it absorbs liquid and expands.

[0036] Reference Figure 5 The non-woven fabric wrapping layer 26 is a PE cast film, which is both breathable and leak-proof. The non-woven fabric wrapping layer 26 and the first absorbent core 22 are bonded together by ultrasonic composite bonding to form a first bonding area 27. The first bonding area 27 is located at the peripheral edge of the absorbent core layer 2 and the location of the guide groove 221. After bonding, the second absorbent core 23 can be wrapped inside, thereby obtaining the absorbent core layer 2. It should be noted that after the absorbent core layer 2 is prepared, the first absorbent core 22 and the second absorbent core 23 can freely abut against each other. When the sanitary napkin is used, relative displacement can occur between the first absorbent core 22 and the second absorbent core 23 during women's walking and exercise, thereby accelerating moisture removal and keeping the sanitary napkin dry and comfortable.

[0037] In addition, back to Figure 4The first absorbent core 22 is provided with a first embossed surface 223 on the side close to the second absorbent core 23, and the second absorbent core 23 is provided with a second embossed surface 231 on the side close to the first absorbent core 22. After the absorbent core layer 2 is compositely formed, the first convex circle on the surface of the first embossed surface 223 and the second convex circle on the surface of the second embossed surface 231 can be normally misaligned. When a woman walks or exercises, the first convex circle and the second convex circle abut against each other, which can have a tendency to force the first absorbent core 22 and the second absorbent core 23 to move in opposite directions, further improving the moisture-wicking and breathable effect of the sanitary napkin. In addition, the side of the first absorbent core 22 away from the second absorbent core 23 is also provided with a third embossed surface 224. The gaps between the third convex circles on the surface of the third embossed surface 224 are used to lock larger dirt such as blood clots, thereby ensuring the cleanliness and hygiene of the skin-friendly side of the sanitary napkin.

[0038] Reference Figure 6 , a second bonding area 32 is formed between the breathable and water-repellent bottom 3 and the absorbent core layer 2 through ultrasonic composite bonding. The second bonding area 32 does not completely cover the area between the absorbent core layer 2 and the breathable and water-repellent bottom 3, so that the absorbent core layer 2 and the breathable and water-repellent bottom 3 outside the second bonding area 32 are freely arranged to form a suspended structure 33. It should be noted here that two arcuate edges 34 are formed at the junction of the suspended structure 33 and the second bonding area 32. The two arcuate edges 34 are arranged at an angle and the endpoints intersect, and the arc centers of the two arcuate edges 34 are respectively located at the front and rear ends of the sanitary napkin structure. The setting of the suspended structure 33 can keep the absorbent core layer 2 in contact with the curve of the female buttocks, reduce the direct contact and friction between the breathable and water-repellent bottom 3 and the skin, improve the comfort of the sanitary napkin, and help to improve the side leakage phenomenon. Example 2

[0039] The embodiments of the present application disclose a production process.

[0040] Reference Figure 7 The present invention discloses a production process, which is applied to the skin-friendly sanitary napkin structure described in Example 1, and specifically comprises the following steps: In step S1 , pure cotton raw material is processed into pure cotton fabric, the pure cotton fabric is cut into a plurality of cotton soft surface layers 24 by a cutting mechanism, and a plurality of marking areas for placing SAP cores 25 are made on the cotton soft surface layers 24 .

[0041] Step S2: Lay the cotton soft surface layer 24 flat with the surface of the cotton soft surface layer 24 having the marking area facing upward, and then evenly spray the SAP core 25 into each marking area.

[0042] In step S3, another cotton soft surface layer 24 is pressed and overlapped on the original cotton soft surface layer 24, and then the two layers of cotton soft surface layers 24 are flattened. The two layers of cotton soft surface layers 24 are partially bonded by a first ultrasonic composite mechanism to produce a second absorbent core 23, and the bonding position is the outside of each marking area.

[0043] Step S4, place the non-woven fabric wrapping layer 26 on the working station of the forming equipment 4, and then place the first absorption core 22 and the second absorption core 23 in turn on the non-woven fabric wrapping layer 26. A negative pressure mechanism is provided at the bottom of the working station, which can generate negative pressure suction acting on the first absorption core 22 and the second absorption core 23, so that the various surface layers of the absorption core layer 2 remain in close contact; the absorption core layer 2 enters the second ultrasonic composite mechanism 6 for bonding and fixing, and the bonding position of the absorption core layer 2 is located at the guide groove 221 and the side edge of the absorption core layer 2.

[0044] It should be noted that the outer perimeter of the nonwoven fabric wrapping layer 26 is larger than the outer perimeter of the second absorbent core 23, thereby forming an extended surrounding portion 261 (refer to FIG. Figure 2 ); When the non-woven fabric wrapping layer 26, the second absorbent core 23 and the first absorbent core 22 are placed in the working station in sequence, the extended surrounding portion 261 can be rolled upward and cover the peripheral edge of the first absorbent core 22 away from the second absorbent core 23, thereby playing a role in pre-positioning the second absorbent core 23.

[0045] In addition, the first absorbent core 22 and the second absorbent core 23 need to undergo pre-processing before being bonded and fixed. The first absorbent core 22 needs to be embossed by a double-sided embossing machine to form double-sided embossing. Then, the first absorbent core 22 needs to be passed through a cutting mechanism to partially cut out the guide groove 221 and the drainage portion 222. The second absorbent core 23 needs to be embossed by a single-sided embossing machine to form single-sided embossing. When the second absorbent core 23 is placed on the non-woven fabric wrapping layer 26, the single-sided embossing of the second absorbent core 23 faces upward.

[0046] In step S5, the anti-reverse osmosis membrane 21 and the hot air non-woven fabric layer 1 are sequentially stacked on the surface of the absorbent core layer 2, and each surface layer enters the third ultrasonic compounding mechanism for bonding and fixing to obtain a semi-finished product.

[0047] Step S6, invert the semi-finished product so that the non-woven fabric wrapping layer 26 faces upward, and then press the breathable and water-repellent bottom 3 onto the surface of the non-woven fabric wrapping layer 26, and both enter the fourth ultrasonic compounding mechanism for bonding.

[0048] Step S7: Apply glue to the side wings 31 of the breathable and water-repellent bottom 3 and stick release paper.

[0049] Step S8, folding the package.

[0050] The molding device 4 used in step S4 specifically includes a device body 5 and a second ultrasonic compounding mechanism 6 provided on the device body 5. Figure 8 A linear drive member 52 is fixed to the work surface of the device body 5. In this embodiment, the linear drive member 52 is configured as a linear module. A station base plate 51 is fixed to the movable end of the linear drive member 52. That is, the station base plate 51 is slidably mounted on the station base plate 51 via the linear module. A limit mold frame 53 is removably fixed to the top of the station base plate 51 via fasteners. The inner shape of the limit mold frame 53 is the same as that of the first absorbent core 22. The non-woven fabric wrapping layer 26, the second absorbent core 23, and the first absorbent core 22 can be placed in sequence inside the limit mold frame 53.

[0051] The surface of the station substrate 51 is provided with a plurality of negative pressure holes 511, and all the negative pressure holes 511 are directly opposite to the inner area of ​​the limiting mold frame 53; Figure 9 A negative pressure chamber 512 is provided at the bottom of the workstation base, and each negative pressure hole 511 is connected to the negative pressure chamber 512, and the side of the negative pressure chamber 512 away from the negative pressure hole 511 is connected to an air intake pipe 513, and the end of the air intake pipe 513 away from the negative pressure chamber 512 is connected to a negative pressure mechanism (not shown in the figure). By controlling the operation of the negative pressure mechanism, negative pressure can be prevented from being formed in the negative pressure chamber 512 and each negative pressure hole 511. The negative pressure can make the non-woven fabric wrapping layer 26, the second absorbent core 23 and the first absorbent core 22 tightly attracted to facilitate subsequent transfer and composite bonding.

[0052] Reference Figure 10 The second ultrasonic composite mechanism 6 includes an ultrasonic body and an ultrasonic die 61 fixed to the lifting end of the ultrasonic body. The shape and size of the ultrasonic die 61 are set to be equal to the forming size of the absorption core layer 2; the surface of the ultrasonic die 61 is protrudingly provided with a first forming part 62 and a second forming part 63. The first forming part 62 is arranged around the peripheral edge of the ultrasonic die 61, and the second forming part 63 is located in the middle of the ultrasonic die 61, and the shape of the second forming part 63 is adapted to the shape of the guide groove 221.

[0053] When the linear drive member 52 is in motion, the moving end of the linear drive member 52 moves with the work station substrate 51 to the position of the second ultrasonic composite mechanism 6. At this time, the ultrasonic die head 61 can be set opposite to the limiting mold frame 53. After the ultrasonic die head 61 moves downward, it rests on the work station substrate 51. The first molding part 62 can rest on the peripheral edge of the first absorption core 22, and the second molding part 63 can rest on the peripheral edge of the guide groove 221, thereby successfully completing the composite bonding of the absorption core layer 2.

[0054] Reference Figure 9 、 Figure 10.In addition, a plurality of guide posts 514 are provided on the surface of the work station substrate 51, and the axial direction of the guide posts 514 is the same as the setting direction, and each guide post 514 is located outside the limiting mold frame 53; an integrally formed side guide block 64 is provided on the side of the second ultrasonic compounding mechanism 6, and the side guide block 64 is provided with a guide groove 641. When the linear drive member 52 is actuated and the moving end of the linear drive member 52 moves with the work station substrate 51 to the position of the second ultrasonic compounding mechanism 6, the guide post 514 can be in a position opposite to the guide groove 641, and then the cooperation of the guide post 514 and the guide groove 641 can realize the precise positioning of the ultrasonic die head 61 and the limiting mold frame 53, so as to facilitate the smooth bonding and compounding of the absorbent core layer 2.

[0055] The above are preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A skin-friendly sanitary napkin structure, characterized by: The invention comprises a hot air non-woven fabric layer (1), an absorbent core layer (2) and a breathable and water-repellent bottom (3) arranged in sequence from the skin-near side to the outside, wherein side wings (31) are respectively provided on both side edges of the breathable and water-repellent bottom (3), and the back of the side wings (31) is provided with a backing adhesive layer and bonded with release paper; The absorbent core layer (2) comprises an anti-reverse osmosis membrane (21), a first absorbent core (22), a second absorbent core (23) and a non-woven fabric wrapping layer (26) arranged in sequence from the skin-proximal side to the outside, the first absorbent core (22) is provided with a plurality of guide grooves (221) extending therethrough, the extension direction of each guide groove (221) being the same as the extension direction of the first absorbent core (22), and the guide groove (221) is partially provided with a drainage portion (222) extending toward the side of the first absorbent core (22); The first absorbent core (22) and the non-woven fabric wrapping layer (26) are bonded and fixed by an ultrasonic composite process to form a first bonding area (27), and the first bonding area (27) is located at the side edge of the absorbent core layer (2) and the guide groove (221); at this time, the first absorbent core (22) and the second absorbent core (23) are freely abutted.

2. The skin-friendly sanitary napkin structure according to claim 1, characterized in that: The second absorbent core (23) includes a SAP core (25) and two layers of cotton soft surface layers (24), and a plurality of spacer areas (241) are formed between the two layers of cotton soft surface layers (24) by ultrasonic composite bonding. Each of the spacer areas (241) is arranged at equal intervals, and the SAP core (25) is sprayed on the inner side of each spacer area (241).

3. The skin-friendly sanitary napkin structure according to claim 1, characterized in that: The side of the first absorbent core (22) close to the second absorbent core (23) is provided with a first embossed surface (223), and the side of the second absorbent core (23) close to the first absorbent core (22) is provided with a second embossed surface (231), and the first convex circle on the surface of the first embossed surface (223) and the second convex circle on the surface of the second embossed surface (231) are normally staggered.

4. The skin-friendly sanitary napkin structure according to claim 1, characterized in that: The breathable and water-repellent bottom layer (3) and the absorbent core layer (2) are bonded to form a second bonding area (32), and the absorbent core layer (2) outside the second bonding area (32) is freely arranged between the breathable and water-repellent bottom layer (3) and forms a suspended structure (33).

5. The skin-friendly sanitary napkin structure according to claim 4, characterized in that: Two arcuate edges (34) are formed at the junction of the suspended structure (33) and the second bonding area (32), and the two arcuate edges (34) are arranged at an angle and their endpoints intersect; the arc centers of the two arcuate edges (34) are respectively located at the front and rear ends of the sanitary napkin structure.

6. A production process for the skin-friendly sanitary napkin structure according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step S1, preparing pure cotton fabric, cutting the pure cotton fabric into a plurality of cotton soft surface layers (24) by a cutting mechanism, and making a plurality of marking areas on the cotton soft surface layers (24); Step S2, laying the cotton soft surface layer (24) flat with the marked area facing upward, and then spraying the SAP core (25) evenly on each marked area; Step S3, pressing another cotton soft surface layer (24) onto the original cotton soft surface layer (24), flattening the two cotton soft surface layers (24) and locally bonding them through a first ultrasonic compounding mechanism to obtain a second absorbent core (23); Step S4, placing the non-woven fabric wrapping layer (26) on the working station of the forming equipment (4), and then placing the first absorbent core (22) and the second absorbent core (23) in turn on the non-woven fabric wrapping layer (26), a negative pressure mechanism is provided at the bottom of the working station, and the negative pressure suction force generated when the negative pressure mechanism is in operation forces the various surface layers of the absorbent core layer (2) to maintain close contact; the absorbent core layer (2) enters the second ultrasonic composite mechanism (6) for bonding and fixing, and the bonding position of the absorbent core layer (2) is located at the guide groove (221) and the side edge of the absorbent core layer (2); Step S5, stacking the anti-reverse osmosis membrane (21) and the hot air non-woven fabric layer (1) on the surface of the absorbent core layer (2) in sequence, and each surface layer enters the third ultrasonic compounding mechanism for bonding to obtain a semi-finished product; Step S6, inverting the semi-finished product so that the non-woven fabric wrapping layer (26) faces upward, and then pressing the breathable and water-repellent bottom (3) onto the surface of the non-woven fabric wrapping layer (26), and both of them enter the fourth ultrasonic compounding mechanism for bonding; Step S7, applying glue to the side wing (31) and pasting release paper; Step S8, folding the package.

7. The production process according to claim 6, characterized in that: In step S4, the outer peripheral size of the non-woven fabric wrapping layer (26) is larger than the outer peripheral size of the second absorbent core (23), thereby forming an extended surrounding portion (261); when the first absorbent core (22) is placed on the second absorbent core (23), the extended surrounding portion (261) is wrapped around the side edge of the first absorbent core (22) away from the second absorbent core (23).

8. The production process according to claim 6, characterized in that: In step S4, the first absorbent core (22) and the second absorbent core (23) need to undergo pre-processing, wherein the first absorbent core (22) needs to pass through a double-sided embossing machine to form double-sided embossing, and then needs to be partially cut by a cutting mechanism to form a guide groove (221); the second absorbent core (23) needs to pass through a single-sided embossing machine to form single-sided embossing, and when the second absorbent core (23) is placed on the non-woven fabric wrapping layer (26), the single-sided embossing of the second absorbent core (23) faces upward.

9. The production process according to claim 6, characterized in that: The forming device (4) in step S4 comprises a device body (5) and the second ultrasonic composite mechanism (6) arranged on the device body (5); the device body (5) is slidably provided with a station base plate (51), and the station base plate (51) is driven and connected to a linear drive member (52); a limit mold frame (53) is detachably fixed on the top of the station base plate (51), and the inner shape of the limit mold frame (53) is adapted to the shape of the first absorbent core (22); The surface of the station substrate (51) is provided with a plurality of negative pressure holes (511), and each of the negative pressure holes (511) is directly opposite to the inner area of ​​the limiting mold frame (53); the bottom of the station substrate (51) is provided with a negative pressure chamber (512), and each of the negative pressure holes (511) is connected to the negative pressure chamber (512); the bottom of the negative pressure chamber (512) is connected to an air intake pipe (513), and one end of the air intake pipe (513) away from the negative pressure chamber (512) is connected to the negative pressure mechanism; The work station substrate (51) is provided with a vertically arranged guide column (514), and a side guide block (64) is provided on the side of the second ultrasonic composite mechanism (6), and the side guide block (64) is provided with a guide groove (641). When the linear drive member (52) is actuated, the work station substrate (51) moves to a position where the guide column (514) and the guide groove (641) are opposite each other.

10. The production process according to claim 9, characterized in that: The second ultrasonic composite structure (6) includes an ultrasonic die head (61), the shape of which is compatible with the shape of the absorbent core layer (2); a first molding portion (62) and a second molding portion (63) are protrudingly provided on the surface of the ultrasonic die head (61), the first molding portion (62) is arranged around the peripheral edge of the ultrasonic die head (61), and the second molding portion (63) is located in the middle of the ultrasonic die head (61), and the shape of the second molding portion (63) is compatible with the shape of the guide groove (221).

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