Absorbent article surface layer with additional flexible fluffy structure

Abstract

The utility model discloses an absorption product surface layer with an additional flexible fluffy structure, which is formed by mutually connecting at least two layers of relatively independent layered structures, a base material layer and an additional layer in a non-compact composite mode, and sealing edges with the width not exceeding 5% of the width of the additional layer are arranged on the two sides of the additional layer in the width direction. The base material layer and the additional layer are non-compactly bonded between the sealing edges on the two sides, and a fluffy interlayer space and a plurality of small empty chambers on the two sides are formed between the additional layer and the base material layer. The surface of the absorption product is additionally provided with an additional structure which has a certain three-dimensional space configuration characteristic and has low production and processing requirements, the overall comprehensive performance is good, cost control is good, and the comprehensive use experience requirements of dryness, softness, breathability and the like can be met.

Description

Technical Field

[0001] The utility model relates to a layered structure accessory for penetration, guiding and ventilation in absorbent articles, and discloses a surface layer of an absorbent article with an additional flexible fluffy structure. Background Art

[0002] The surface layer structure of an absorbent article is a layered structure in the whole that can play a role in guiding and penetrating the absorbed substance, avoid causing more discomfort to the user's skin, and continuously improve the wearing contact performance through its physical structure. Finally, the absorbed substance is completely separated from the user, and then the original physical properties of the substance exclusion area are restored.

[0003] The surface layer structure of an absorbent article is a skin-friendly and water-permeable layer structure relative to the bottom impermeable structure. From the inside-out direction of wearing the absorbent article, since it is arranged in contact with the user's skin, it is relatively isolated from the outside and airtight. Therefore, a good absorbent article usually requires this structure to provide certain air permeability while maintaining good penetration performance. After the liquid penetrates through the surface layer structure to the inner absorbent core, the air permeability can reduce the humidity of the user's skin and accelerate the drying of the surface layer structure. If possible, for the inevitable reverse osmosis phenomenon occurring in the core, it can also play a certain role in wet-dry isolation to prevent the wet moisture from contacting the user's skin again.

[0004] A more effective method is to change the physical properties of the surface layer structure through modifiers to enable it to have the above functions, or change the components of the surface layer structure to greatly improve the physical properties of the surface layer structure. However, the research and development cost of this improvement method is relatively high. In contrast, using an additional structure so that the surface layer structure does not need to take multiple aspects into account, and letting a part of the functions be realized by the additional structure, and letting the original surface layer structure only be responsible for the main functions of guiding and ventilation, is another reasonable means to reduce the development of new materials. For example, two materials with different functions are closely combined to perform corresponding functions respectively. A relatively independent structure is easier to complete different functions. However, this structure has a relatively obvious problem that once deformation occurs, the foreign body sensation after the superposition of the two will be relatively obvious. Here, the significant increase in thickness will also bring the accumulation of a moist feeling, resulting in discomfort on the skin.

[0005] Therefore, it is necessary to make a change beyond the existing configuration in a certain structure, or solve the above-mentioned technical defects from a different angle. Summary of the Utility Model

[0006] In view of the technical deficiencies in the background art, a solution provided by the present utility model is to attach a flexible and fluffy structure to the surface layer of the absorbent article, which preferably solves the problems of surface layer contact performance and diversion and ventilation in the above-mentioned background art, and more effectively meets the actual requirements for improving the structure of the absorbent article surface layer. In view of this, the general technical solution is as follows:

[0007] The surface layer of the absorbent article with an attached flexible and fluffy structure includes a substrate layer with liquid permeability. A layer of additional layer is attached to the surface of the substrate layer. The two side edges in the width direction of the additional layer are connected to the substrate layer through sealing edges formed by ultrasonic weld marks distributed at intervals. The width of the sealing edge on either side does not exceed 5% of the width of the additional layer. On one side of the sealing edge area, there are several small chambers arranged in a strip shape and sandwiched between the additional layer and the substrate layer, which are surrounded by discrete additional ultrasonic weld marks and the ultrasonic weld marks of the sealing edge. The additional layer is connected to the substrate layer in any one of the non-dense composite forms of ultrasonic weld marks with a distribution density of no more than 5 per square centimeter, an adhesive area of no more than 40% of the area of this region, and a mixture of ultrasonic weld marks and adhesive area of no more than 40% of the area of this region in the area between the two sealing edges on both sides.

[0008] As a further technical solution of the present utility model, the additional layer is any one of single-layer SSS non-woven fabric, SMS non-woven fabric, and hot air non-woven fabric; or any one of double-layer SSS non-woven fabric composites, double-layer SMS non-woven fabric composites, and double-layer hot air non-woven fabric composites; or a composite of any two of SSS non-woven fabric, SMS non-woven fabric, and hot air non-woven fabric.

[0009] As a further technical solution of the present utility model, a number of through holes for penetration and ventilation are provided on the surface of the additional layer.

[0010] As a further technical solution of the present utility model, the ultrasonic weld marks are at least one of the shapes of dot, strip, star, heart, rectangle, and triangle.

[0011] As a further technical solution of the present utility model, the distance between the sealing edge and the discrete additional ultrasonic weld marks around the small chambers is 0.5 mm - 10 mm.

[0012] As a further technical solution of the present utility model, at least two columns of ultrasonic weld marks are provided on the sealing edge in the length direction of the additional layer.

[0013] As a further technical solution of the present utility model, when there is an adhesive area in the area between the edge seals on both sides of the additional layer, the adhesive area is composed of adhesive positions in at least one of the shapes of strip, dot, wave, sawtooth, triangle, star, rectangle, etc., such that the sum of the areas of all the adhesive positions does not exceed 40% of the area of the aforementioned area, and the distance between any two adhesive positions is not less than 1 millimeter.

[0014] As a further technical solution of the present utility model, after the additional layer is connected to the base material layer in the area between the edge seals on both sides, the additional layer will peel off relative to the base material layer when the peel force is between 25 Gf and 50 Gf.

[0015] As a further technical solution of the present utility model, the discrete extra ultrasonic weld marks within the non-edge seals are several small blocks with the number not exceeding 2×2 ultrasonic weld marks, and the small chambers are located between any two adjacent small blocks and the edge seals.

[0016] The beneficial effects of the present utility model are as follows:

[0017] The configuration of the double-layer surface layer structure enables the product to take into account several performance indicators such as cost, softness, dryness, breathability, and non-deformation. On this basis, the double-layer configuration of the present utility model has lower processing requirements and has a certain three-dimensional fluffy space. While having a better appearance, it allows the manufacturer to have more sufficient costs to continue developing subsequent products, which is helpful for the iterative upgrade of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the surface layer of the absorbent article of the present utility model from a top view angle.

[0019] Figure 2 It is an enlarged partial cross-sectional view of the edge seal and its surrounding structure of the present utility model.

[0020] Figure 3 It is an enlarged partial three-dimensional structure diagram of the edge seal and its surrounding structure of the present utility model.

[0021] Figure 4 It is a simplified schematic cross-sectional structure diagram of the surface layer of the absorbent article of the present utility model Figure 1 。

[0022] Figure 5 It is a simplified schematic cross-sectional structure diagram of the surface layer of the absorbent article of the present utility model Figure 2 。

[0023] Figure 6 It is a simplified schematic cross-sectional structure diagram of the surface layer of the absorbent article of the present utility model Figure 3 。

[0024] Figure 7Schematic diagram of the bonding position of the present utility model in the absorbent article Figure 1 。

[0025] Figure 8 Schematic diagram of the bonding position of the present utility model in the absorbent article Figure 2 。

[0026] Wherein: substrate layer 1, additional layer 2, through holes 20, ultrasonic weld marks 3, edge seals 4, small chambers 5, bonding zones 6, bonding positions 60, small blocks 7. Specific embodiments

[0027] The following combines Figures 1 to 8 the content shown, and elaborates on the relevant preferred embodiments to illustrate the implementation manner of the present utility model. The implementation manner of the present utility model is not limited to the following embodiments, and the relevant necessary components of the present utility model in the technical field should be regarded as well-known technologies in the technical field, which can be known and mastered by those skilled in the technical field.

[0028] Combined with Figure 1 shown, the surface layer of the absorbent article with an additional flexible and fluffy structure includes a substrate layer 1 with liquid permeability, and an additional layer 2 is attached to the surface of the substrate layer 1. Both the additional layer 2 and the substrate layer 1 are rectangles with an aspect ratio ≥ 1. The two side edges in the width direction of the additional layer 2 are connected to the substrate layer 1 through edge seals 4 formed by ultrasonic weld marks 3 distributed at intervals. The width of any one side of the edge seal 4 does not exceed 5% of the width of the additional layer 2. On one side of the edge seal 4 area, several small chambers 5 in a strip shape are formed between the additional layer 2 and the substrate layer 1 and surrounded by discrete additional ultrasonic weld marks 3 and the ultrasonic weld marks 3 of the edge seal 4. The additional layer 2 is connected to the substrate layer 1 in any one of the non-dense composite forms of ultrasonic weld marks 3 with a distribution density not exceeding 5 per square centimeter, a bonding zone 6 not exceeding 40% of the area of this region, and a mixture of ultrasonic weld marks 3 and the bonding zone 6 not exceeding 40% of the area of this region in the area between the two edge seals 4 on both sides.

[0029] Specifically, the surface layer of the present utility model can be applied to general absorbent articles as the surface layer or top layer structure. The purpose of this structure is also to allow the liquid or semi-liquid substances in contact to quickly penetrate through this structure and avoid a large amount of accumulation in the visible area, so that the absorbent structure covered by it can absorb the substances. Finally, it is ensured that the surface layer or top layer structure can still remain relatively dry after contacting the liquid or semi-liquid substances, avoiding the inconvenience caused by flowing everywhere.

[0030] Absorbent products are usually worn close to the body. For mobile users, the surface layer or top layer structure also needs to be skin-friendly. The skin-friendly performance requirements for different user groups will also be different. For example, there are certain differences between absorbent products for infants and young children, absorbent products for general adults, and absorbent products for patients, which vary depending on the process requirements.

[0031] Furthermore, when used next to the body, the surface layer or top layer structure of the absorbent product, compared with flat absorbent products such as nursing pads that are next to the body but not affected by the user's body shape, will affect the degree of foreign body sensation during normal next-to-skin use, depending on the choice of materials. If the structure is more resilient, it is easy to rub against the user's skin and cause skin damage, while softer materials are more suitable for more different groups of people. Considering that the use occasions of absorbent products have certain requirements for care, absorbent products are usually made into disposables. Although woven absorbent products still exist, their application is far less than that of non-woven absorbent products, and the production and use costs are also higher than non-woven absorbent products. At present, the materials used in the surface layer or top layer of absorbent products are also mostly non-woven structures. Because they are not the core components of absorbent products, considering the manufacturing and R&D costs, it is impossible to use a complex structure like the absorbent core.

[0032] As an extension, if the surface structure of the above-mentioned single-layer configuration needs to enhance certain performance, such as softness, skin-friendliness, air permeability, liquid permeability and other properties, a more feasible approach is to change the masterbatch formula for preparing the structure so that it is modified after appropriate treatment, or to physically provide the structure with a surface structure that can achieve the required function, so that it fully possesses or achieves the purpose to a certain extent.

[0033] For example, in order to improve the permeability of liquid, the porosity of non-woven fabrics can be increased and their hydrophilic properties can be changed with modifiers; in order to improve the conductivity of liquid, guide grooves or retaining walls can be artificially opened on the surface of non-woven fabrics to allow the liquid to flow in a certain direction and avoid the accumulation of liquid in one place; in order to change the softness of the structure, non-woven molding with lower toughness but higher softness can be selected.

[0034] However, if a single-layer structure is required to possess the above-mentioned performances in different dimensions simultaneously, it poses high requirements for the design of the production process and the selection of raw materials for production. The cost required to simultaneously meet multiple performances in different dimensions on a single-layer structure is relatively high. Therefore, in the field of absorbent articles where the product iteration speed is relatively fast, mainstream absorbent article manufacturers on the market generally strengthen several performance indicators with relatively strong correlations targeted to achieve phased goals. After a certain amount of technological precipitation, breakthroughs are then made towards other performance indicators with relatively weak correlations based on the current product, and the product is gradually iterated in a spiral upward form. The optimization of product performance is obviously gradually improved and will not experience a large jump in a short period of time. If continuous research and development are to be carried out, the improvement in each stage cannot consume too much R & D cost. Similarly, this poses high requirements for controlling the R & D cycle of the product. Without the support of a suitable R & D team, it is very difficult for general production enterprises and R & D teams to complete the R & D of an ideal product within a relatively short cycle.

[0035] In view of this, from the perspective of better controlling R & D costs, compared with the single-layer structure configuration, the double-layer composite structure configuration, that is, the form in which the base layer 1 and the additional layer 2 are non-tightly compounded and connected to each other, is a relatively reasonable solution. Among the specific reasons, the target performance indicators are reasonably distributed into the two-layer structure. Only a small amount of the physical properties achieved by the base layer 1 overlap with those of the additional layer 2. The base layer 1 mainly considers how to improve performance indicators related to excrement itself, such as allowing liquids to penetrate faster, while the additional layer 2 solves the performance indicators of how to improve the wearing comfort when the surface layer or the top layer structure comes into contact with the user's skin. Considering rationality, the performance indicators in the above two directions basically cover more than 90% of the problems that the surface layer or the top layer structure of absorbent articles need to face. Moreover, the types of performances targeted by the two are more likely to achieve product finalization within a relatively short cycle. In terms of rationality, the product configuration of the present utility model has certain advantages compared with existing products.

[0036] Combined with Figures 1 to 8As shown in any illustration, further, in the present utility model, as the base layer 1 for liquid absorption and the additional layer 2 for improving the user's body feeling, the connection form between them is also an essential element for reasonably reflecting the comprehensive performance of the composite product. The additional layer 2 is attached to the surface of the base layer 1 and is arranged towards the user. During use, it will move along with the user's movement. In the case of a nursing pad that is not worn closely, since the application scenario of the nursing pad is relatively broad, there is no need to consider the liquid diffusion situation too much, and it has no necessary connection with the main structure of the present utility model. In the case of close-fitting wear, the method adopted by the present utility model is that the additional layer 2 is connected to the base layer 1 in a non-dense form. On the premise of ensuring that the physical properties of the additional layer 2 will not be significantly affected by the composite structure, the liquid permeability and penetrability of the additional layer 2 are improved, and the base layer 1 can be less affected by the composite structure due to the liquid and is more likely to come into contact with the liquid to achieve the penetration and guidance of the liquid. Moreover, air can also have more permeable gaps between the additional layer 2 and the base layer 1. In the case of non-dense connection, the close-fitting use of the absorbent product causes the material to bend due to conforming to the outer contour of the user's body, and there is a high probability of inconsistency in the deformation between the additional layer 2 and the base layer 1. These inconsistent deformations result in irregular, interconnected, differently shaped and widely distributed gaps generated between the additional layer 2 and the base layer 1. These gaps can improve the liquid passing rate and gas fluidity, and also improve the fluffiness and softness of the composite back layer structure, allowing the user to obtain a more diverse wearing experience.

[0037] As described above, the composite surface layer structure has certain three-dimensional space structure characteristics at the microscopic level compared with a single-layer configuration or a tightly composite double-layer configuration. Especially at the microscopic level, compared with a tightly composite or open-through-hole configuration, the three-dimensional space will more significantly exist between the two fabric structures. This part of the subdivided three-dimensional space has different spatial volumes affected by the composite tightness of the two fabric structures, and finally the porosity of the composite double-layer surface layer configuration reaches a relatively high level without significantly changing the overall thickness.

[0038] Combined Figures 1 to 3 shown, and Figure 7 and Figure 8 is also reflected. Among them, the non-dense composite form consists of 2 parts, the sealing edges 4 arranged on both sides in the width direction of the additional layer 2 - both the additional layer 2 and the base layer 1 are rectangles with an aspect ratio ≥ 1, and a long strip structure similar to a sanitary napkin also meets this situation - several small chambers 5 between the two sealing edges 4, and a connection structure with ultrasonic weld marks 3 or bonding areas 6 between the two sealing edges 4 and the small chambers 5. Among them, Figures 1 to 3 is the composite method of a single ultrasonic weld mark 3. Figure 7 and Figure 8It is the way that the ultrasonic weld marks 3 and the bonding positions 60 coexist. The edge seal 4 is composed of several ultrasonic weld marks 3 with spaces between them. The discrete additional ultrasonic edge seals 4 that are relatively independent of the edge seal 4 and the edge seal 4 enclose several small chambers 5 between the base layer 1 and the additional layer 2. The areas where the ultrasonic weld marks 3 or the bonding areas 6 exist are composite connection structures with a connection density that is more discrete relative to the edge seal 4.

[0039] The edge seal 4 is present on both sides of the additional layer 2 in the width direction, so it can ensure that the entire additional layer 2 does not shift relative to the base layer 1, and it is not easy for the additional layer 2 to be peeled off as a whole relative to the base layer 1. Its relatively dispersed ultrasonic weld marks 3 can also make the two sides of the additional layer 2 not appear too rigid when contacting the user's skin. As a technical supplement, for the composite surface layer configuration of the present utility model, the basic requirement for its structural strength is that when the peeling force on the additional layer 2 is not less than 25 Gf, it will be affected by the peeling force and peel off relative to the base layer 1.

[0040] Furthermore, the ultrasonic weld marks 3 preferably have a distribution density of no more than 8 per square centimeter. For example, a distribution density of no more than 8 per square centimeter and a distribution density of no more than 5 per square centimeter meet the requirements.

[0041] In the case where the porosity is less than 60%, the fluidity of the liquid will be significantly affected, which is positively correlated with the ratio between the relative excretion amount and the fitting area when the user wears it close to the body. In addition, it is also positively correlated with the generation rate of the interlayer space for buffer deformation in the composite surface layer structure. On the premise of not being affected by the material properties of the two relatively independent layer structures and having the most basic liquid permeability, air permeability and softness properties, the case where the mutually composite area accounts for about 40% or less of the total area of the additional layer 2 can meet the performance requirements for mass-produced absorbent articles.

[0042] It should be noted that the ultrasonic weld marks 3 are also a form of bonding for the bonding area 6. Exactly speaking, the expression of the ultrasonic weld marks 3 refers to a bonding composite structure with an area significantly smaller than the style of the bonding area 6, while the bonding area 6 is a bonding composite structure with a larger and more obvious visual appearance. Here, a comparison can be made Figure 1 with Figure 7 or Figure 8 the visual effects. And in the present utility model, the definition of the bonding area 6 more clearly refers to the style of hot melt adhesive bonding, where Figure 2 or Figure 3 the bonding area 6 is realized as a non-dense composite using a single ultrasonic weld mark 3 style or a single bonding position 60 style, while Figure 4 it is realized as a non-dense composite using the style of the composite of ultrasonic weld marks 3 and bonding positions 60 within the bonding area 6.

[0043] Reference Figures 1 to 3 As shown in any figure, the small chamber 5 is formed between the discrete additional ultrasonic weld mark 3 and the ultrasonic weld mark 3 of the edge seal 4 and is also linearly arranged in contact with the edge seal 4. The existence of this structure allows the liquid to flow in the width direction of the absorbent product - that is, in the width direction of the additional layer 2 - which can be beneficial to the realization of breathability under the premise of the existence of the small chamber 5 and more dense gaps. The highly fluid excretions such as urine and loose stools will also be hindered by the raised structure formed by the small chamber 5, making it more difficult to diffuse toward the two sides of the absorbent core. Instead, it is concentrated to penetrate and is concentratedly absorbed by the absorbent core part of the absorbent product. To a certain extent, it can reduce the time that the liquid diffuses laterally and stays in the surface structure, thereby improving the dryness performance.

[0044] The middle area of ​​the additional layer 2 where the ultrasonic welding mark 3 and the bonding area exist, because the overall composite area does not exceed 40% of the area of ​​this area, the proportion is less than half, and therefore the porosity between the additional layer 2 and the substrate layer 1 in this area is also very high. After contacting the additional layer 2, the liquid can quickly penetrate from the gap to reduce the time it stays in the additional layer 2, and will not test the absorption problem of the additional layer 2 too much, but will be handed over to the substrate layer 1 to achieve rapid guidance and penetration of the liquid. The existence of the gap also facilitates the liquid to diffuse laterally and then quickly penetrate when it cannot penetrate at the first time.

[0045] On the whole, the additional layer 2 and the substrate layer 1 in the utility model are not tightly bonded through the above-mentioned basic non-dense composite structure, which is fundamentally different from some double-layer surface layer schemes currently available on the market. The composite scheme of the prior art tends to increase the porosity of the double-layer structure while making the composite structure tightly bonded, and makes the voids have a very high degree of overlap. It is almost impossible to form a relative dislocation in a small area between the two-layer structure under the action of external force. The scheme of the utility model as a whole is prone to relative dislocation between the ultrasonic welding marks 3 or the bonding areas due to the rubbing of external force. The composite structure formed by the prior art is more like a thickened single-layer structure than the double-layer composite structure of the utility model. Therefore, when it comes into contact with liquid excrement, it is obviously different from the composite configuration principle of the utility model. The theories between the two are not completely interoperable or even obviously different, and the use effects obtained are also inconsistent. Please refer to the description of the prior art, and the prior art will not be repeated here.

[0046] Based on the aforementioned theoretical and practical structural foundations, as one of the better embodiments of the present invention, the additional layer 2 is any one of a single-layer SSS non-woven fabric, SMS non-woven fabric and hot air non-woven fabric; or any one of a double-layer SSS non-woven fabric composite, a double-layer SMS non-woven fabric composite and a double-layer hot air non-woven fabric composite; or a composite of any two of SSS non-woven fabric, SMS non-woven fabric and hot air non-woven fabric. The additional layer 2 formed by a single-layer structure or a double-layer composite structure can essentially be understood as a structure of conventional thickness or a thickened structure, such as the double-layer tight composite configuration in the prior art configuration described above. In this embodiment, the scheme is more inclined to directly apply existing products with good performance in the selection of composite methods. Since one of the core ideas of the present invention is to accelerate the iteration speed of absorbent product research and development and reduce the iteration cost of research and development, the selection of composite structure in this embodiment is obviously consistent with it. Among them, SSS non-woven fabric, SMS non-woven fabric and hot air non-woven fabric are all non-woven fabric types in a broad sense. The various components that constitute the fabric can be individually set and modified masterbatches according to actual needs. Therefore, the structure of the additional layer 2 can be modified to a corresponding degree in accordance with common sense as needed, and the required performance indicators can be quickly obtained.

[0047] And, further, there is an optimized product in hot air non-woven fabrics, namely, diversion hot air non-woven fabrics, which, based on ordinary hot air non-woven fabrics, has better liquid diversion performance through specific process design or fiber structure adjustment, which may include changing the fiber arrangement, adding a diversion layer or using special fibers to achieve this. Based on the above structural characteristics, the diversion hot air non-woven fabric can replace ordinary hot air non-woven fabric products and be used in the utility model.

[0048] Based on the situation of the previous embodiment, as one of the preferred embodiments of the utility model and also an extension of the previous embodiment, refer to Figure 1 As shown, the surface of the additional layer 2 is provided with a plurality of through holes 20 for penetration and breathability. The additional structural surface layer of the utility model is provided with additional through holes 20 in the structure of the additional layer 2 in physical or chemical form, which is also a way to quickly improve the breathability and permeability of the product under the requirement of controlling costs. The required performance improvement is obtained in a simple way, which will not have a negative impact on the existing research and development progress and is conducive to shortening the research and development verification cycle.

[0049] Relatively independent, here you can compare Figure 1 and Figure 7 or Figure 8 , and contrast Figure 2 and Figure 3 or Figure 4, as one of the preferred embodiments of the present utility model, the ultrasonic weld marks 3 are in at least one of the shapes of dot-like, strip-like, star-shaped, heart-shaped, rectangular, and triangular. This means that the ultrasonic weld marks 3 can be either a single shape or any combination of the above shapes. There is not much difference in the different shape patterns of the ultrasonic weld marks 3 in essence, except that there are different requirements for the texture design of the pressure roller. However, after applying ultrasonic welding, the spacing between the ultrasonic weld marks 3 needs to meet the requirements proposed by the foregoing features, thereby meeting the basic conditions for non-dense compounding. Non-dense compounding provides basic structural support for multiple performance indicators such as fluffiness, softness, high liquid permeability, good diffusion effect, and good air permeability required for the implementation of the present utility model. The conventional choice is usually dot-like, which is consistent with the style of the existing ultrasonic composite roller. The processing difficulty of its roller is also relatively low. Moreover, since the number of ultrasonic weld marks 3 is less than that of the conventional structure, the manufacturing requirements for the welding roller are also lower, which is beneficial to cost control in research and development and mold opening, and the welding roller is more likely to obtain a higher qualified product rate. In addition, for different shape patterns of ultrasonic weld marks 3, especially in the combination of more types of ultrasonic weld marks 3 patterns, the surface layer structure can obtain a more diverse surface appearance, enabling production and R & D personnel to obtain a more significant fabric texture effect with less design input, which helps the product to be more visually recognizable.

[0050] As one of the preferred embodiments of the present utility model, the spacing between the additional ultrasonic weld marks 3 around the edge seal 4 and the small chambers 5 is 0.5 mm - 10 mm. Based on the requirements for the distribution of the ultrasonic weld marks 3 and the bonding area 6 in the foregoing text, when the above spacing is at the minimum value of 0.5 mm, the width of the edge seal 4 will be the smallest, and the volume of the small chambers 5 will also decrease due to the reduction of the spacing of the additional discrete ultrasonic weld marks 3. Generally speaking, this is only considered for application in the elastic pants products of baby diapers. In the case of a 10 mm spacing, it is not generally applied uniformly between all the ultrasonic weld marks 3. Instead, it is more inclined to increase the volume of the small chambers 5 and exist between the edge seal 4 and the additional discrete ultrasonic weld marks 3. In other words, the selection of the above spacing is not single. Designers can flexibly set it between the ultrasonic weld marks 3 and the bonding area 6 according to the needs of specific products. For example, when the bonding area 6 is a strip with a large area, the spacing between them can be increased due to the increase in the single area of the bonding area 6 to ensure that the overall area ratio meets the upper limit of the design, and then the basic physical properties of the product required can be met within the flexible adaptation range, realizing controllable R & D at low cost, reducing the cost of R & D and production, and ensuring that the technical indicators of the new product basically meet the design requirements without significant deviation.

[0051] Combined with Figures 1 to 3As shown, as one of the better embodiments of the utility model, the edge sealing 4 is provided with at least 2 rows of ultrasonic weld marks 3 in the length direction of the additional layer 2. The 2 rows of ultrasonic weld marks 3 within the edge sealing 4 can more effectively ensure the structural strength of the edge sealing 4 to ensure that the additional layer 2 will not be misaligned or peeled off from the substrate layer 1 as a whole due to external force rubbing, so that the structure has the most basic reliability. At the same time, under the limited conditions of the spacing in the previous embodiment, the edge sealing 4 can also set a relatively suitable width according to the style of the ultrasonic weld mark 3, taking into account suitable visual perception and good soft touch. Under the premise of ensuring the connection strength, the user near the groin will not obviously feel the discomfort caused by the edge sealing 4 structure, but overall, the width of the single-sided edge sealing 4 still cannot exceed 5% of the total width of the additional layer.

[0052] As one of the preferred embodiments of the present invention, especially a further improvement of one of the embodiments in the aforementioned technical solution, when the additional layer 2 has a bonding area in the area between the edge seals 4 on both sides, the bonding area is composed of a plurality of bonding positions 60 in at least one of the shapes of strips, dots, waves, serrations, triangles, stars, and rectangles. Figure 7 and Figure 8 The bonding positions 60 of different styles make the total area of ​​all the bonding positions 60 not exceed 40% of the area of ​​the aforementioned area, and the spacing between any two bonding positions 60 is not less than 1 mm. Since the area of ​​a single bonding position 60 in the bonding area is significantly larger than that of ultrasonic welding 3 from the perspective of conventional understanding, the spacing between them should not be less than 5 mm while ensuring that the requirements of non-dense composite are met, to ensure that the surface layer of the final composite structure can obtain the required physical properties when worn, especially to ensure that the composite surface layer structure can maintain a high porosity when the gaps are randomly formed. This is the fundamental guarantee for ensuring the lower limit of performance for the double-layer non-dense composite surface layer configuration that has been customized and improved. The shapes of the above-mentioned bonding positions 60 can be a variety of different combinations or a single style, with a variety of choices.

[0053] As one of the more preferred embodiments of the present invention, after the additional layer 2 is connected to the substrate layer 1 in the area between the edge seals 4 on both sides, the additional layer 2 will be peeled off relative to the substrate layer 1 when the peeling force is between 25Gf-50Gf. The above peeling force range can cover the daily use occasions of most users, and because the composite surface layer structure of the present invention is a non-dense composite structure, even if peeling occurs, large-scale peeling dislocation will not occur in a short time. This non-dense composite style has better structural support for softness and breathability in liquid-permeable occasions during strenuous exercise, allowing users to get a more comfortable wearing experience even in occasions with frequent excretion.

[0054] Combined with the definition of discrete additional ultrasonic welding marks in the non-sealing edge 4 in the foregoing embodiments, as one of the preferred embodiments of the present invention, the discrete additional ultrasonic welding marks 3 in the non-sealing edge 4 are several small blocks 7 with the number of ultrasonic welding marks 3 not exceeding 2×2. The small chamber 5 is located between any two adjacent small blocks 7 and the sealing edge 4. The selection of this structural pattern is also a preferred implementation form for the non-dense composite pattern of the present invention. The small blocks 7 of ultrasonic welding marks 3 formed in this way can relatively obviously form a semi-surrounded small chamber 5 with the ultrasonic welding marks 3 in the sealing edge 4. If there is a bonding position 60 connecting the additional layer 2 and the substrate layer 1 attached to the small chamber 5 at this time, the small chamber 5 can be easily and stably formed. This is of practical significance for the composite surface layer structure of the present invention to realize the due function of the small chamber 5.

[0055] In summary, the surface layer structure of the absorbent article disclosed in the present invention enables an additional structure with certain three-dimensional spatial configuration characteristics but relatively low production and processing requirements to be attached to the surface of any body-attached absorbent article. The composite configuration of the additional structure and the substrate surface layer structure can quickly solve the technical problems of how to balance the performance indicators of cost, softness, dryness, breathability, and non-deformation of the absorbent article within a controllable cost and a controllable R & D cycle, meeting the basic user needs. Further, the selection of the material of the additional structure itself will not directly affect the product performance after being compounded with the surface layer. The two relatively independent structures are each more likely to design a variety of performance indicators with higher relevance, and finally enable the composite surface layer structure to quickly and simply obtain the required comprehensive performance. Therefore, the production conditions required by the present invention for manufacturers are lower compared to the existing tightly compounded composite surface layer configuration.

[0056] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An absorbent article surface layer with an additional flexible fluffy structure, comprising a liquid-permeable substrate layer, characterized in that: An additional layer is attached to the surface of the substrate layer, and the two sides of the additional layer in the width direction are connected to the substrate layer through edge sealing formed by ultrasonic welds distributed at intervals, and the edge sealing on any side has a width not exceeding 5% of the width of the additional layer, and one side of the edge sealing area is provided with a plurality of small chambers formed by discrete additional ultrasonic welds and ultrasonic welds of the edge sealing, which are sandwiched between the additional layer and the substrate layer and distributed in a strip shape. The additional layer is connected to the substrate layer in the area between the edge sealing on both sides through any non-dense composite form of ultrasonic welds with a distribution density not exceeding 5 per square centimeter, a bonding area not exceeding 40% of the area of ​​the area, and a mixture of ultrasonic welds and bonding areas not exceeding 40% of the area of ​​the area.

2. The absorbent product surface layer of the additional flexible fluffy structure according to claim 1, characterized in that: The additional layer is any one of a single-layer SSS non-woven fabric, SMS non-woven fabric and hot air non-woven fabric; or any one of a double-layer SSS non-woven fabric composite, a double-layer SMS non-woven fabric composite and a double-layer hot air non-woven fabric composite; or a composite of any two of SSS non-woven fabric, SMS non-woven fabric and hot air non-woven fabric.

3. The absorbent product surface layer of the additional flexible fluffy structure according to claim 1 or 2, characterized in that: The surface of the additional layer is provided with a plurality of through holes for penetration and ventilation.

4. The absorbent article surface layer of the additional flexible fluffy structure according to claim 1, characterized in that: The ultrasonic welding mark is in at least one of a dot shape, a strip shape, a star shape, a heart shape, a rectangle shape, and a triangle shape.

5. The absorbent product surface layer of the additional flexible fluffy structure according to claim 1 or 4, characterized in that: The spacing between the edge seal and the discrete additional ultrasonic welding marks around the small cavity is 0.5 mm to 10 mm.

6. The absorbent article surface layer of the additional flexible fluffy structure according to claim 4, characterized in that: The edge sealing is provided with at least two rows of ultrasonic welding marks in the length direction of the additional layer.

7. The absorbent article surface layer of the additional flexible fluffy structure according to claim 1, characterized in that: When there is a bonding area in the area between the edge seals on both sides of the additional layer, the bonding area is composed of bonding positions of at least one of a plurality of strips, dots, waves, serrations, triangles, stars, and rectangles, so that the total area of ​​all bonding positions does not exceed 40% of the area of ​​the aforementioned area, and the distance between any two bonding positions is not less than 1 mm.

8. The absorbent article surface layer of the additional flexible fluffy structure according to claim 1, characterized in that: After the additional layer is connected to the substrate layer in the area between the edge seals on both sides, the additional layer will be peeled off relative to the substrate layer when the peeling force is between 25Gf and 50Gf.

9. The absorbent article surface layer of the additional flexible fluffy structure according to claim 1, characterized in that: The discrete additional ultrasonic weld marks in the non-edge seal are a number of small blocks of ultrasonic weld marks not exceeding 2×2, and the small cavity is located between any two adjacent small blocks and the edge seal.

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