Structural layer capable of absorbing solids, hygienic product and application of structural layer and hygienic product

Abstract

The invention relates to the field of hygienic products, in particular to a structural layer capable of absorbing solids, a hygienic product and application thereof.The structural layer comprises a first surface layer and a second surface layer, the second surface layer is compounded below the first surface layer, through holes used for absorbing solid substances are evenly formed in the first surface layer, and the first surface layer is made of hydrophobic fibers; the second surface layer is made of hydrophilic fibers, and the bulkiness of the first surface layer is greater than that of the second surface layer; a plurality of bulges are uniformly arranged on the second surface layer, and the bulges and the through holes are arranged in a staggered manner. The problem that an existing hygienic product cannot absorb solid matter can be solved.

Description

Technical Field

[0001] The present invention relates to the field of sanitary products, and in particular to a solid absorbable structural layer, sanitary products and applications thereof. Background Art

[0002] Existing sanitary products, such as sanitary napkins, panty liners, and diapers, are primarily designed to absorb liquids, but solid matter can also be excreted during actual use. For example, when using sanitary napkins, human excretion contains not only blood but also solids such as blood clots and endometrial fragments. When using baby diapers, urine and soft stools may also contain undigested solid matter. However, current sanitary products primarily absorb liquids and are unable to absorb solid matter. These solids remain on the surface of the sanitary products and are easily leaked during human activity. Summary of the Invention

[0003] The present invention aims to provide a structural layer capable of absorbing solids, a sanitary product and applications thereof, so as to solve the problem that existing sanitary products cannot absorb solid substances.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The structural layer capable of absorbing solids includes a first surface layer and a second surface layer. The second surface layer is compounded below the first surface layer. Through holes for absorbing solid substances are evenly opened on the first surface layer. The first surface layer adopts hydrophobic fibers and the second surface layer adopts hydrophilic fibers. The bulkiness of the first surface layer is greater than that of the second surface layer. A number of protrusions are evenly arranged on the second surface layer.

[0006] The beneficial effects of this program are:

[0007] 1. The evenly spaced through holes on the first surface layer provide a dedicated channel for solid matter discharged from the human body (such as endometrial fragments, blood clots, undigested food residues, etc.). At the same time, the first surface layer uses hydrophobic fibers to reduce the retention of liquid on the surface. Combined with the strong adsorption force of the hydrophilic fibers on the second surface layer, a gradient conduction mechanism of "no liquid on the surface, rapid absorption by the lower layer" is formed to avoid the dampness caused by liquid back-seepage. In addition, the second surface layer is less fluffier than the first surface layer, and the fibers are arranged more tightly, which can quickly guide the liquid to the absorption core and reduce the accumulation of liquid between the two layers. The effective absorption of solid matter is achieved, avoiding leakage caused by solid matter remaining on the surface. In addition, the first surface layer uses hydrophobic fibers with higher fluffiness, which are soft in texture and have a large contact area with the skin, which can reduce friction irritation and enhance the skin-friendly experience.

[0008] 2. Protrusions are set on the second surface layer. The protrusions of the second surface layer penetrate deep into the fluffy first surface layer, and enhance the composite strength of the two layers through physical anchoring. This solves the problem of loose bonding caused by the high fluffiness of the first surface layer and the low fluffiness of the second surface layer, and the structural difference between the first and second surface layers. At the same time, the protrusions and through holes are staggered, which does not affect the passing efficiency of solids and liquids, and can form uniform support points on the overall structure, reducing stratification and wrinkling during use.

[0009] Preferably, as an improvement, a transition layer is compounded between the first surface layer and the second surface layer, the transition layer is provided with transition holes aligned with the through holes on the first surface layer, the thickness of the transition layer is less than the thickness of the first surface layer and the second surface layer, and the fiber denier of the transition layer is greater than the fiber denier of the first surface layer and less than the fiber denier of the second surface layer.

[0010] Beneficial effects:

[0011] 1. A transition layer is provided between the first and second surface layers. The fiber denier of the transition layer is between the first surface layer (low denier) and the second surface layer (high denier), forming a "gradient transition" structure. This avoids the bonding resistance when the two fibers of different deniers come into direct contact. This denier gradient allows the transition layer to form a tight entanglement with the fine denier fibers of the first surface layer and an effective bite with the coarse denier fibers of the second surface layer, significantly improving the composite strength between the two layers and reducing problems such as delamination and wrinkling.

[0012] 2. The transition layer is provided with transition holes aligned with the through-holes of the first surface layer, ensuring that solids and liquids can pass smoothly through the continuous channels to the second surface layer without being hindered by the existence of the transition layer. At the same time, the precise alignment of the transition holes and through-holes prevents the accumulation of solids at the interface.

[0013] 3. The transition layer is thinner than the first and second surface layers, effectively bridging the gap without adding unnecessary thickness to the overall structure, thus avoiding the foreign body sensation caused by excessive thickness. Furthermore, the thinner thickness reduces the transition layer's resistance to liquid flow. Combined with the hydrophilicity of the second surface layer, this accelerates liquid penetration from the transition layer into the absorbent core, preventing fluid accumulation.

[0014] Preferably, as an improvement, the transition layer is made by mixing the material of the first surface layer and the material of the second surface layer, with the mixing ratio being 7:3-5:5.

[0015] Beneficial effect: The transition layer is made of a mixture of the first surface layer material and the second surface layer material in a ratio of 7:3-5:5. The first surface layer material can retain the material compatibility with the upper layer, and the appropriate amount of the second surface layer material can enhance the affinity with the lower layer, greatly reducing the composite resistance caused by the difference in interface materials. At the same time, the transition structure formed by the mixed material does not hinder the transfer efficiency of solids and liquids through the transition hole, taking into account both bonding strength and functional continuity.

[0016] Preferably, as an improvement, the edges of the first surface layer and the second surface layer are provided with hot pressing edges, and a plurality of hot pressing points are evenly provided in the middle area of ​​the first surface layer and the second surface layer, and the hot pressing points are staggered with the through holes.

[0017] Beneficial effects: The hot pressing edges of the first surface layer and the second surface layer can achieve edge sealing, preventing the two layers from separating from the edges or leaking sideways during use; the hot pressing points evenly arranged in the middle area can further enhance the overall bonding strength of the two layers, avoiding local delamination caused by differences in fluffiness, and the hot pressing points are staggered with the through holes, which will not block the passage path of solids and liquids. While strengthening the structural stability, it ensures that solid and liquid substances can smoothly penetrate into the lower layer, taking into account both bonding firmness and functional effectiveness.

[0018] Preferably, as an improvement, the first surface layer comprises an upper long-fiber layer and a lower short-fiber layer, and the long-fiber layer and the short-fiber layer are tightly compounded.

[0019] Beneficial effects: The long fiber layer on the upper layer of the first surface layer has high strength and good tear resistance, which can effectively reduce the fuzzing phenomenon caused by friction on the edge of the through hole and improve the surface durability; the short fiber layer on the lower layer is soft and fluffy, which can enhance the skin-friendly feel when in contact with the skin, and the long fiber layer and the short fiber layer are tightly compounded, which can not only retain the overall hydrophobicity and fluffiness of the first surface layer, but also strengthen the structural stability through the synergistic effect of the two layers, ensuring the smooth passage of solid matter while improving the comfort of use.

[0020] Preferably, as an improvement, the through holes are circular through holes with a diameter of 5-10 mm and a distribution density of 0.2-1 holes / cm 2 .

[0021] Beneficial effects: The through-hole diameter is set to 5-10mm, which can accurately match the size of solid matter discharged by the human body (such as endometrial fragments and blood clots), ensuring that the solids can pass smoothly without clogging; the distribution density is 0.2-0.5 pieces / cm 2 The design can not only provide sufficient channels to meet the needs of rapid solid penetration, but also avoid weakening the fiber connection strength of the first surface layer due to too dense holes (to prevent pilling or tearing). At the same time, the hole spacing is reasonable, which does not affect the fluffy skin-friendly and hydrophobic properties of the first surface layer, taking into account the solid passage efficiency, structural stability and comfort of use.

[0022] Preferably, as an improvement, the bulkiness of the first surface layer is 1.5-2.5 times that of the second surface layer.

[0023] Beneficial effect: The fluffiness of the first surface layer is 1.5-2.5 times that of the second surface layer, which allows the first surface layer to maintain sufficient fluffiness to meet the needs of skin-friendly touch and solid matter passing through, and allows the second surface layer to maintain a relatively tight structure to efficiently guide liquid and avoid fluid accumulation. The difference in fluffiness between the two forms a functional gradient, which not only ensures the core functional distinction of "fluffy and skin-friendly upper layer + tight liquid-conducting lower layer", but also avoids difficulties in structural composite due to excessive differences, taking into account the synergy of user experience and liquid-conducting efficiency.

[0024] Preferably, as an improvement, the thickness of the transition layer is 0.3-0.6 times that of the first surface layer, and the thickness of the transition layer is 0.4-0.8 times that of the second surface layer.

[0025] Beneficial Effects: The transition layer thickness is set at 0.3-0.6 times that of the first surface layer and 0.4-0.8 times that of the second surface layer. This thinness prevents overfilling the bulk of the first surface layer, thus maintaining its skin-friendliness and solid-state permeability. It also creates a suitable thickness difference with the second surface layer to enhance interfacial engagement. This thickness range ensures that the transition layer fully functions as a bridge, buffering the structural differences between the two layers without hindering the efficient transfer of solids and liquids through the transition holes due to excessive thickness. This balance ensures structural composite strength, smooth material transfer, and an overall lightweight feel.

[0026] A sanitary product comprising the absorbent solid structure layer according to any one of claims 1 to 8.

[0027] The invention relates to an application of a solid-absorbing structural layer, which is applied to sanitary napkins, panty liners or diapers to absorb solid and liquid substances discharged by the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a longitudinal cross-sectional view of Example 1 of the present invention.

[0029] Figure 2 This is a plan view of Example 1 of the present invention.

[0030] Figure 3 This is a longitudinal cross-sectional view of Example 2 of the present invention.

[0031] Figure 4 This is a plan view of embodiment 3 of the present invention.

[0032] The reference numerals in the drawings of the specification include: first surface layer 1, through hole 2, second surface layer 3, protrusion 4, transition layer 5, hot pressing edge 6, hot pressing point 7, transition hole 8. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the embodiments.

[0034] Example 1

[0035] like Figure 1 and Figure 2 The structure of the absorbent material is shown in Figure 1. It consists of a first surface layer 1 and a second surface layer 3, which are laminated together. The second surface layer 3 is fixed to the bottom of the first surface layer 1 through a hot press lamination process. The edges of the two layers are aligned to form a functional layer with uniform thickness. The first surface layer 1 is made of hydrophobic polypropylene (PP) hot air nonwoven fabric, formed by hot air bonding, and has fluffy and soft properties.

[0036] In this embodiment, a rectangular structure layer is used for demonstration. A plurality of through holes 2 are evenly distributed on the first surface layer 1. In this embodiment, the through holes 2 are preferably circular through holes 2. In other embodiments, the through holes 2 may be of other shapes. In this embodiment, the diameter of the through holes 2 is 8 mm, the center distance between adjacent through holes 2 is 12 mm, and the distribution density is 0.3 holes / cm 2 (That is, 0.3 through holes 2 are set per square centimeter). The through holes 2 are processed by a laser drilling process, and the edges of the holes are laser melted to form a smooth annular edge seal, which can effectively avoid fuzzing during use. The second surface layer 3 is made of a hot air non-woven fabric mixed with hydrophilic viscose fiber and polypropylene (PP), and is formed by a high-pressure hot rolling process, and the fibers are arranged relatively tightly. Conical protrusions 4 are evenly arranged on the side of the second surface layer 3 facing the first surface layer 1. The bottom diameter of the protrusion 4 is 1mm, the height is 0.8mm, and the center distance between adjacent protrusions 4 is 8mm. The protrusions 4 are formed by mold hot pressing, and the positions of all protrusions 4 are staggered with the through holes 2 of the first surface layer 1.

[0037] The bulkiness of the first surface layer 1 is 1.5-2.5 times that of the second surface layer 3. In this embodiment, the bulkiness of the first surface layer 1 is 20cm 3 / g (corresponding to a thickness of 2.2mm and a weight of 25g / m 2 ), which not only ensures the skin-friendly touch when in contact with the skin, but also provides sufficient space for solid matter to pass through. The bulkiness of the second surface layer 3 is 8cm 3 / g (corresponding to a thickness of 0.9mm and a weight of 22g / m 2 ).

[0038] When the structural layer of this embodiment is in use, solid matter discharged by the human body (such as endometrial fragments with a diameter of ≤8mm) can smoothly enter between the two layers through the through holes 2 of the first surface layer 1, and then be guided to the lower absorbent core by the compact fiber structure of the second surface layer 3; liquids (such as menstrual blood, urine) can quickly penetrate from the through holes 2 and the gap between the two layers to the second surface layer 3 under the synergistic effect of the hydrophobicity of the first surface layer 1 and the hydrophilicity of the second surface layer 3, and are quickly guided away through its hydrophilic fibers to avoid retention on the surface.

[0039] At the same time, the protrusions 4 of the second surface layer 3 are embedded in the fluffy structure of the first surface layer 1. Combined with the hot pressing composite process, it can effectively solve the problem of loose bonding between the two layers due to the difference in fluffiness, ensuring that there is no stratification or wrinkling during use, and ultimately achieving the effect of "no solid residue, no liquid back-seepage, and stable structure".

[0040] Example 2

[0041] like Figure 3 As shown, the difference between this embodiment and embodiment 1 is that a transition layer 5 is added between the first surface layer 1 and the second surface layer 3, and the transition layer 5 enhances the composite stability of the two layers. The transition layer 5 is fixed between the first surface layer 1 and the second surface layer 3 using a hot melt composite process. The overall shape is sheet-shaped, and the edges are aligned with the first and second surface layers 3. The transition layer 5 is provided with a circular transition hole 8 that corresponds one-to-one to the through hole 2 of the first surface layer 1. The diameter of the transition hole 8 is 8mm, and the center position of the transition hole 8 is completely aligned to ensure that solids and liquids can be transferred smoothly without obstruction or offset. The transition layer 5 is made of a mixture of the hydrophobic PP fiber of the first surface layer 1 and the hydrophilic viscose fiber of the second surface layer 3, and the mixing ratio is 7:3-5:5, specifically 6:4. The fiber denier of the transition layer 5 is greater than the fiber denier of the first surface layer 1 and less than the fiber denier of the second surface layer 3, forming a gradient transition of fiber thickness. The thickness of the transition layer 5 is 0.3-0.6 times that of the first surface layer 1 and 0.4-0.8 times that of the second surface layer 3. In this embodiment, it is 1.0 mm, which ensures the structural support of the transition layer 5 while avoiding excessive thickness affecting the overall fluffiness.

[0042] The addition of a transition layer 5 in this embodiment reduces the direct contact between the hydrophobic PP fibers of the first surface layer 1 and the hydrophilic viscose fibers of the second surface layer 3, thereby enhancing the bonding strength between the two layers and further resolving the issue of a weak composite due to differences in bulk. Furthermore, the addition of the transition layer 5 mitigates the differential deformation between the two layers under stress, enhancing the tear resistance of the structural layer and making it more resilient to the friction and compression experienced in daily activities.

[0043] Example 3

[0044] like Figure 4As shown, the difference between this embodiment and embodiment 1 is that, in this embodiment, a rectangular structural layer is used as an example for demonstration, and the edges of the first surface layer 1 and the second surface layer 3 are hot-pressed with a hot-pressing edge 6, and the middle area of ​​the first surface layer 1 and the second surface layer 3 is evenly hot-pressed with a number of hot-pressing points 7, and the hot-pressing points 7 are staggered with the through-hole 2. This embodiment achieves a sealed fixation of the edges of the two layers by the edge hot-pressing edge 6, which can effectively prevent the edges from delaminating or side leakage due to gaps during use; the hot-pressing points 7 in the middle area further enhance the overall bonding strength of the two layers, especially in areas with large differences in fluffiness, which can reduce local separation caused by active friction. At the same time, the staggered design of the hot-pressing point 7 and the through-hole 2 ensures that solid and liquid substances can still penetrate smoothly through the through-hole 2 to the lower layer, while strengthening the structural stability and maintaining the high efficiency of the core absorption function.

[0045] Example 4

[0046] The difference between this embodiment and embodiment 1 is that the first surface layer 1 includes an upper long-fiber layer and a lower short-fiber layer, and the long-fiber layer and the short-fiber layer are tightly compounded.

[0047] In this embodiment, the upper long fiber layer enhances the overall structural stability of the first surface layer 1 by virtue of its continuous filament structure, especially reducing the fiber shedding and pilling at the edge of the through hole 2 during friction; the lower short fiber layer retains sufficient fluffiness and skin-friendliness, ensuring composite compatibility with the second surface layer 3 and the efficiency of solid material passage.

[0048] Example 5

[0049] This embodiment also provides a sanitary product, comprising the absorbent solid structure layer of embodiment 1.

[0050] Example 6

[0051] This embodiment also provides an application of a solid-absorbent structural layer, which is applied to sanitary napkins, panty liners, or diapers to absorb solid and liquid substances discharged by the human body.

[0052] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A structural layer of absorbable solids, characterized by: It includes a first surface layer and a second surface layer, the second surface layer is composited below the first surface layer, the first surface layer is evenly provided with through holes for absorbing solid substances, the first surface layer adopts hydrophobic fibers, the second surface layer adopts hydrophilic fibers, the fluffiness of the first surface layer is greater than that of the second surface layer, and a number of protrusions are evenly provided on the second surface layer.

2. The absorbable solid structural layer according to claim 1, characterized in that: A transition layer is composited between the first surface layer and the second surface layer. The transition layer is provided with transition holes aligned with the through holes on the first surface layer. The thickness of the transition layer is less than that of the first surface layer and the second surface layer. The fiber denier of the transition layer is greater than the fiber denier of the first surface layer and less than the fiber denier of the second surface layer.

3. The absorbable solid structural layer according to claim 2, characterized in that: The transition layer is made by mixing the material of the first surface layer and the material of the second surface layer, with the mixing ratio being 7:3-5:

5.

4. The absorbable solid structural layer according to claim 1, characterized in that: The edges of the first surface layer and the second surface layer are provided with hot pressing edges, and a plurality of hot pressing points are evenly provided in the middle area of ​​the first surface layer and the second surface layer, and the hot pressing points are staggered with the through holes.

5. The absorbable solid structural layer according to claim 1, characterized in that: The first surface layer comprises an upper long fiber layer and a lower short fiber layer, and the long fiber layer and the short fiber layer are tightly compounded.

6. The absorbable solid structural layer according to claim 1, characterized in that: The through holes are circular with a diameter of 5-10 mm and a distribution density of 0.2-1 holes / cm 2 .

7. The absorbable solid structural layer according to claim 1, characterized in that: The fluffiness of the first surface layer is 1.5-2.5 times that of the second surface layer.

8. The absorbable solid structural layer according to claim 1, characterized in that: The thickness of the transition layer is 0.3-0.6 times that of the first surface layer, and the thickness of the transition layer is 0.4-0.8 times that of the second surface layer.

9. A sanitary product, characterized in that: A structural layer comprising the absorbable solid according to any one of claims 1-8.

10. Use of a structural layer of absorbable solid according to any one of claims 1 to 8, characterized in that: Used on sanitary napkins, panty liners or diapers to absorb solid and liquid substances discharged by the human body.

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