Hole-shaped and strip-shaped disposable hygienic product and preparation method thereof

Abstract

The invention relates to the field of disposable hygienic products, in particular to a porous and strip-shaped disposable hygienic product and a preparation method thereof, and mainly solves the problem of contradiction between rapid liquid diffusion and leakage prevention of the disposable hygienic product in the prior art. The hygienic product body is provided with a front area, a middle area and a rear area in the longitudinal direction, the hygienic product body comprises a liquid-permeable surface layer, an absorption core layer and a liquid-tight bottom layer, a flow guide groove is pressed in the upper surface of the hygienic product body, and the first flow guide groove is provided with a plurality of first grooves distributed at intervals; a plurality of first through holes without absorbing materials are formed in the absorbing core layer along the flow guide grooves at intervals, the first through holes are distributed between every two adjacent first grooves, and the first through holes and the first grooves are distributed at intervals; the middle area of the absorption core layer is provided with at least two liquid passing grooves without containing absorption materials, and the liquid passing grooves are first strip-shaped grooves without containing absorption materials or through hole grooves composed of through hole columns with the through hole area larger than 50%.

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene products, and more particularly to a perforated and strip-shaped disposable hygiene product and its preparation method. Background Technology

[0002] With socio-economic development and increased awareness of women's health, disposable feminine hygiene products such as sanitary napkins, panty liners, and panty liners have become indispensable consumer goods in the daily lives of modern women. These products not only play a crucial role during women's menstrual cycles but are also widely used in postpartum care and for protecting against minor vaginal discharge.

[0003] Currently, most disposable feminine hygiene products on the market, such as sanitary napkins, panty liners, and other similar products, primarily use a single linear structure for their distribution channels. The initial intention of this design was to guide liquid along a specific path, allowing for more even distribution on the absorbent core and thus improving absorption efficiency. However, in actual use, the single linear distribution channel has significant limitations: when the liquid volume is large or the flow rate is fast, liquid tends to accumulate in localized areas of the channel. Due to the limited dispersion capability of the linear channel, it cannot promptly disperse the accumulated liquid to other areas, resulting in uneven distribution of liquid on the absorbent core surface. In this situation, the absorption capacity of localized areas of the absorbent core quickly reaches saturation, while other areas fail to fully absorb the liquid, increasing the risk of side and front / back leakage. Conversely, even by improving the dispersion capability of the distribution channel, the absorbent core still fails to fully absorb the liquid, further increasing the risk of side and front / back leakage.

[0004] Besides the channel design, some sanitary products also employ leak-proof guards and 3D edge protectors to enhance leak-proof performance. Leak-proof guards typically have elastic edges on both sides of the sanitary napkin, which prevent liquid from leaking out from the sides through contraction. 3D edge protectors have upward-protruding structures at the front and back of the sanitary napkin to prevent liquid from leaking forward or backward. However, these leak-proof structures also have certain problems: while leak-proof guards can prevent side leakage to some extent, if liquid has already seeped into the guard, or if the guard's elasticity is insufficient or its seal is poor, side leakage can still occur. Furthermore, leak-proof guards may cause friction against the skin, causing discomfort. While 3D edge protectors can effectively prevent front and rear leakage, in actual use, if the edge height is insufficient or the fit to the body is poor, leakage cannot be completely prevented. In addition, these extra leak-proof structures increase the production cost and complexity of sanitary products, potentially leading to higher prices and affecting market competitiveness. Summary of the Invention

[0005] Therefore, in view of the above problems, the present invention provides a disposable sanitary product with holes and strips and a method for preparing the same, which mainly solves the contradiction between rapid liquid diffusion and leakage prevention in the prior art disposable sanitary products.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A disposable sanitary product with perforated and strip-shaped components includes a sanitary product body, defined as extending along the length direction of the sanitary product body as the longitudinal direction and extending along the width direction of the sanitary product body as the transverse direction. The sanitary product body has a front area, a middle area, and a rear area along the longitudinal direction. The sanitary product body includes a liquid-permeable surface layer, an absorbent core layer, and a liquid-impermeable bottom layer. A flow guide groove is pressed on the upper surface of the sanitary product body. The first flow guide groove has a plurality of spaced first grooves. The absorbent core layer is provided with a plurality of first through holes without absorbent material at intervals along the flow guide groove. The first through holes are distributed between two adjacent first grooves and are spaced apart from the first grooves.

[0008] The middle area of ​​the absorbent core layer is provided with at least two liquid passage grooves. The liquid passage groove is a first strip groove without absorbent material or a row of through holes with a through hole area greater than 50%. The liquid passage groove is basically arranged in the longitudinal direction and distributed laterally at intervals. The length of the liquid passage groove is 10-100mm and the width is 1-10mm. The spacing between the laterally distributed liquid passage grooves is ≥10mm. The rear area of ​​the absorbent core layer is provided with at least one second strip groove without absorbent material.

[0009] The sanitary product body has a drying rate of not less than 4 g / h, the drying rate being equal to the fitted curve of the ratio of the amount of test liquid absorbed by the product to time at consecutive test time points, and a diffusion ratio of not less than 1.5 times, the diffusion ratio being equal to the ratio of the maximum longitudinal diffusion length of the liquid bottom layer to the maximum longitudinal diffusion length of the surface layer.

[0010] Furthermore, the second strip groove is basically arranged in the transverse direction, the second strip groove has an inverted "V" shape, and the V-shaped opening of the second strip groove faces the tail of the rear area. Each of the second strip grooves is distributed at intervals in the longitudinal direction, and the liquid passage groove and the second strip groove are distributed within the annular guide groove.

[0011] Furthermore, the absorbent core layer is a multi-layer composite absorbent core, including a non-woven fabric layer, a mixed layer of fluff pulp and ES fiber, a mixed layer of fluff pulp and superabsorbent polymer, and a toilet paper or non-woven fabric layer.

[0012] Furthermore, the width of the absorbent core layer in the middle region is 50-80mm, the width of the absorbent core layer in the front and rear regions is ≥70mm, and the width of the absorbent core layer in the rear region is ≥ the width of the absorbent core layer in the middle region.

[0013] Furthermore, the liquid-permeable surface layer partially encapsulates the absorbent core layer. The liquid-permeable surface layer encapsulates the side of the absorbent core layer facing the human body, the two lateral sides of the absorbent core layer, and the two lateral sides of the side of the absorbent core layer facing away from the human body. The lateral center of the absorbent core layer facing away from the human body is not encapsulated by the liquid-permeable surface layer and is directly bonded to the impermeable bottom layer. A water-repellent material layer is provided between the liquid-permeable surface layer and the impermeable bottom layer below the absorbent core layer. One side of the water-repellent material layer is bonded to the inner surface of the liquid-permeable surface layer below the absorbent core layer. However, there is no bond between the water-repellent material layer and the liquid-permeable surface layer in the corresponding lateral areas of the liquid-permeable surface layer below the absorbent core layer. Meanwhile, the other side of the water-repellent material layer is bonded to the impermeable bottom layer.

[0014] Furthermore, the sanitary product body has an infiltration efficiency of not less than 0.70 ml / s, whereby the infiltration efficiency is equal to the ratio of liquid absorption to infiltration rate.

[0015] Furthermore, the upper surface of the sanitary product body is provided with a number of needle holes in the front and middle areas, and each needle hole is distributed in the annular guide groove.

[0016] Furthermore, a secondary guide channel is pressed into the rear area of ​​the upper surface of the sanitary product body, with both ends connected to the guide channel respectively. The secondary guide channel does not contain through holes and is distributed on the lateral outer side of the annular guide channel.

[0017] A method for preparing a disposable sanitary product with a perforated and strip-shaped structure as described in claim 1 includes the following steps:

[0018] Step 1, Pre-treatment of the absorbent core layer: 1) Unfold and transport the prepared absorbent core layer, defining the direction of transport as the longitudinal direction and the direction of width as the transverse direction; 2) First through-hole processing: Open several first through-holes without absorbent material at intervals on the absorbent core layer, with the several first through-holes distributed in a ring-shaped interval; 3) Liquid channel processing: Open at least two first strip-shaped channels without absorbent material or through-hole rows with an area greater than 50% in the middle area of ​​the absorbent core layer to form a through-hole channel, the liquid channel is basically set along the longitudinal direction and distributed at intervals in the transverse direction, the distance between adjacent liquid channels is ≥10mm, the length of each liquid channel is 10-100mm, and the width is 1-10mm; 4) Second strip-groove processing: Open at least one second strip-groove without absorbent material in the rear area of ​​the absorbent core layer;

[0019] Step 2, Forming of the absorbent unit continuum: The liquid-permeable surface material in roll form is continuously unwound and conveyed, and the surface facing the absorbent core layer is uniformly coated with adhesive. Then, the absorbent core layer obtained in Step 1 is laid in the middle of the transverse direction of the liquid-permeable surface layer. After that, the transverse edges of the liquid-permeable surface layer are wrapped around the transverse edges of the absorbent core layer and folded to cover the transverse edges of the absorbent core layer on the other side, finally forming a three-layer structure consisting of the liquid-permeable surface layer, the absorbent core layer, and the folded covering part of the liquid-permeable surface layer, i.e., the absorbent unit continuum.

[0020] Step 3, pressing of annular guide grooves: Apply pressure to the absorption unit continuum obtained in step 2 in the positional direction between adjacent first through holes to press out a number of first grooves, with the first through holes and the first grooves distributed at intervals.

[0021] Step 4, Pre-treatment of impermeable base layer and water-repellent material layer: Unwind the roll of impermeable base material and continuously convey it, apply adhesive evenly to the surface facing the absorbent core layer, and then laminate water-repellent material layers on both sides of the impermeable base layer.

[0022] Step 5, Composite Process: For the composite of the impermeable bottom layer and the water-repellent material layer treated in Step 4, local adhesive application is performed on the inner edge area of ​​the water-repellent material layer on both sides of its lateral direction. Then, the impermeable bottom layer is precisely composited with the continuous absorbent unit from Step 3. During the composite process, it is ensured that the adhesive-treated area of ​​the water-repellent material layer covers the inner edge area of ​​the folded cover portion of the liquid-permeable surface layer, forming a multi-layer composite structure including a liquid-permeable surface layer, an absorbent core layer, an impermeable bottom layer, and a water-repellent material layer.

[0023] Step 6, Slitting and Shaping: The multi-layered composite continuous obtained in Step 5 is slid along the preset boundary between two adjacent absorbent units to finally form a single sanitary product body.

[0024] By adopting the aforementioned technical solution, the beneficial effects of this invention are as follows: This disposable sanitary product with perforations and strips, and its preparation method, through the set guide channels, allows liquid to be quickly dispersed and guided through the guide channels regardless of which direction it enters the sanitary product, making the liquid distribution on the absorbent core more uniform, effectively improving absorption efficiency, reducing the risk of side leakage and front-to-back leakage caused by local absorption saturation, and further, by setting several first through holes without absorbent material at intervals along the longitudinal direction of the guide channels on the absorbent layer, the grooves and through holes are designed to be staggered and cooperate with each other, solving the problem of side leakage caused by liquid accumulation in the guide channels, and the existence of through holes increases the flow channels of liquid, further accelerating the infiltration speed of liquid in the absorbent layer, helping the liquid to be absorbed by the absorbent material more quickly, improving the overall absorption performance. When liquids such as gushing blood rush to the guide channels at the edge of the product, the absorption speed decreases as the blood flows along the direction of the guide channels, causing the blood to slip out. However, when the blood comes into contact with the first through hole, a gradient difference in absorption force appears on both sides of the edge of the first through hole, and the blood flows to the end with high absorption force (i.e., the side without perforations), and Simultaneously, it allows space for blood to flow towards the core, accelerating blood infiltration and enabling better diffusion along the guide channels, reducing the risk of blood leakage. Furthermore, at least one second strip-shaped channel, essentially horizontal and distributed between the guide channels, without absorbent material, is provided in the rear area of ​​the absorbent layer. This second strip-shaped channel can prevent liquid from leaking backward and guides the liquid to diffuse to both sides to some extent, enhancing the leak-proof capability of the rear area and optimizing the distribution of liquid in the rear area of ​​the absorbent layer. Several pinholes are provided in the front and middle areas of the upper surface of the sanitary product body. These pinholes increase the liquid permeability of the sanitary product surface, allowing liquid to pass through the permeable surface layer into the absorbent core layer more quickly, increasing the infiltration rate and thus improving the overall absorption efficiency of the sanitary product. Moreover, the sanitary product body has a drying rate of not less than 4 g / h and a longitudinal absorption efficiency of not less than 7 mm / s. This indicator clearly defines the sanitary product's ability to absorb and diffuse liquid in the longitudinal direction, ensuring that the product can quickly and effectively absorb and disperse liquid in actual use, meeting the needs of women in different usage scenarios. Attached Figure Description

[0025] Figure 1 This is a top view of the structure of Embodiment 1 of the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0027] Figure 3 This is a top view of the structure of Embodiment 2 of the present invention. Detailed Implementation

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0029] The embodiments of the present invention are as follows:

[0030] Example 1

[0031] refer to Figure 1 and Figure 2 As shown, a disposable sanitary product with perforated and strip-shaped structures includes a sanitary product body 1. The longitudinal direction is defined as extending along the length of the sanitary product body 1, and the transverse direction is defined as extending along the width of the sanitary product body 1. The sanitary product body 1 has a front area 101, a middle area 102, and a rear area 103 along the longitudinal direction. The sanitary product body 1 includes a liquid-permeable surface layer 11, an absorbent core layer 12, and a liquid-impermeable bottom layer 13. The absorbent core layer 12 includes an upper sheet, a lower sheet, and an absorbent layer sandwiched between the upper and lower sheets. The upper and lower sheets are both non-woven fabric layers. The absorbent material can be toilet paper. The absorbent layer includes absorbent material, which can be a mixture of fluff pulp and superabsorbent polymer particles, or a mixture of fluff pulp, superabsorbent polymer particles and absorbent fibers. The upper surface of the sanitary product body is pressed with a guide groove 2, which has an annular structure. The guide groove 2 has several spaced first grooves 3. The absorbent core layer 12 is provided with several first through holes 4 without absorbent material at intervals along the guide groove 2. The first through holes 4 are distributed between two adjacent first grooves 3, and the first through holes 4 and the first grooves 3 are spaced apart.

[0032] The middle region 102 of the absorbent core layer 12 is provided with two liquid passage channels. The liquid passage channels are first strip channels 5 without absorbent material. The first strip channels 5 are basically arranged along the longitudinal direction and are distributed laterally at intervals. The arrangement of the first strip channels 5 is generally arranged along the longitudinal direction, and is not necessarily a straight line or an arc or other regular structure. The length of the first strip channels 5 is 10-100mm, preferably 85mm, and the width is 1-10mm, preferably 7mm. The spacing between the laterally distributed first strip channels 5 is ≥10mm. The rear region 103 of the absorbent core layer 12 is provided with three second strip channels 6 without absorbent material.

[0033] The sanitary product body 1 has a drying rate of not less than 4 g / h, the drying rate being equal to the fitting curve of the ratio of the amount of test liquid absorbed by the product to the time at consecutive test time points, and a diffusion ratio of not less than 1.5 times, the diffusion ratio being equal to the ratio of the maximum longitudinal diffusion length of the liquid bottom layer to the maximum longitudinal diffusion length of the surface layer.

[0034] The sanitary product body 1 has a diffusion length increase of not less than 6%, preferably not less than 8%, and the diffusion length increase is the ratio of the liquid longitudinal diffusion length dimension to the liquid longitudinal diffusion length dimension of the sanitary product body without this design structure (i.e. without the first through hole 4).

[0035] This disposable sanitary product, featuring both perforated and strip-shaped designs, utilizes a drainage channel 2 to ensure that liquid entering the product from any direction is quickly dispersed and guided, resulting in a more uniform distribution of liquid on the absorbent core layer 12. This effectively improves absorption efficiency and reduces the risk of side leakage and front / back leakage caused by localized absorption saturation. Furthermore, several first through holes 4, without absorbent material, are spaced along the longitudinal direction of the drainage channel 2 on the absorbent core layer 12. The staggered design of the first groove 3 and the first through holes 4 works in conjunction to solve the problem of side leakage caused by liquid accumulation in the drainage channel 2. The presence of the first through holes 4 also increases the liquid flow channels, further accelerating the liquid's penetration into the absorbent layer, facilitating faster absorption by the absorbent material and improving overall absorption performance. When gushing blood or other liquids flow towards the drainage channel 2 at the product's edge, the absorption rate decreases as the blood flows along the drainage channel 2, causing the blood to slip out. However, when the blood comes into contact with the first through holes 4, the absorption rate decreases, and the blood stops flowing. A gradient difference in absorbency appears on both sides of the edge of the hole 4, causing blood to flow towards the end with higher absorbency (i.e., the side without holes). This also creates space for blood to flow towards the core, accelerating blood penetration and allowing it to spread better along the guide channels, reducing the risk of leakage. Simultaneously, at least one second strip-shaped groove 6, essentially horizontal and distributed between the guide channels 2, without absorbent material, is provided in the rear area 103 of the absorbent core layer 12. This second strip-shaped groove 6 can prevent liquid from leaking backward and guides the liquid to diffuse to both sides to a certain extent, enhancing the leak-proof capability of the rear area 103 and optimizing the distribution of liquid in the rear area 103 of the absorbent core layer 12. Furthermore, the sanitary product body 1 has a drying rate of not less than 4 g / h and a longitudinal absorption efficiency of not less than 7 mm / s. These indicators clearly define the sanitary product's ability to absorb and diffuse liquid in the longitudinal direction, ensuring that the product can quickly and effectively absorb and disperse liquid in actual use, meeting the needs of women in different usage scenarios.

[0036] Specifically, the absorbent core layer 12 is a multi-layer composite absorbent core, including a non-woven fabric layer, a mixed layer of fluff pulp and ES fiber, a mixed layer of fluff pulp and superabsorbent polymer, and a tissue paper or non-woven fabric layer. Preferably, it includes a non-woven fabric layer, a mixed layer of fluff pulp and ES fiber, a mixed layer of fluff pulp and superabsorbent polymer, and a non-woven fabric layer, thereby improving the absorption capacity and absorption efficiency of the absorbent core layer.

[0037] Meanwhile, the absorbent core layer 12 is dumbbell-shaped, with a width of 50-80mm in the middle region 102 and a width of ≥70mm in the front region 101 and rear region 103. By having a width of ≥70mm at both ends and a narrowness of ≥50mm in the middle, the absorption core layer 12 reduces the diffusion of blood to both sides, allowing blood to diffuse forward and backward within the core, thus improving side leakage caused by blood spreading laterally to the product edges and being squeezed.

[0038] The liquid-permeable surface layer 11 partially wraps around the absorbent core layer 12. The liquid-permeable surface layer 11 wraps around the side of the absorbent core layer 12 facing the human body, the two lateral sides of the absorbent core layer 12, and the two lateral sides of the side of the absorbent core layer 12 facing away from the human body. The lateral center of the absorbent core layer 12 facing away from the human body is not wrapped by the liquid-permeable surface layer 11 and is directly bonded to the liquid-impermeable bottom layer 13. A water-repellent material layer 14 is provided between the liquid-permeable surface layer 11 and the liquid-impermeable bottom layer 13 on the lower side of the absorbent core layer 12. One side of the water-repellent material layer 14 is bonded to the inner surface of the liquid-permeable surface layer 11 on the lower side of the absorbent core layer 12. However, there is no bonding relationship between the water-repellent material layer 14 and the liquid-permeable surface layer 11 in the corresponding lateral side area on the lower side of the absorbent core layer 12. At the same time, the other side of the water-repellent material layer 14 is bonded to the liquid-impermeable bottom layer 13.

[0039] Furthermore, the sanitary product body 1 has an infiltration efficiency of not less than 0.70 ml / s. The infiltration efficiency is equal to the ratio of liquid absorption to infiltration rate. This indicator measures the performance of the sanitary product from the comprehensive perspective of liquid absorption and infiltration rate. A higher infiltration efficiency means that the sanitary product can absorb more liquid in a shorter time, reduce the time the liquid stays on the surface, reduce the risk of side leakage and front and back leakage, and improve the user's comfort during use.

[0040] Specifically, the guide channels 2 are symmetrically distributed along the transverse central axis of the sanitary product, which allows the sanitary product to maintain balance when absorbing liquid. Regardless of whether the liquid enters from the left or right side, it can be guided and dispersed in a similar manner, ensuring uniform absorption and further improving the leak-proof effect and overall performance stability. In addition, the guide channels 2 located in the central zone 102 have an arc-shaped structure, with the concave surfaces facing outwards. The arc-shaped guide channels 2 can better conform to the curves of a woman's body. When the liquid flows through the central zone 102, it can more effectively guide the liquid to diffuse to both sides, increasing the contact area between the liquid and the absorbent material, improving absorption efficiency, and reducing the accumulation of liquid in the central zone 102, thus reducing the possibility of side leakage.

[0041] Meanwhile, the guide channel 2 in the front zone 101 is a straight line structure, while the guide channel 2 in the rear zone 103 has multiple straight lines. The spacing between the guide channels 2 in the rear zone 103 gradually decreases from the longitudinal center to the lower end. The straight lines facilitate the rapid entry of liquid into the sanitary product. The multiple straight lines in the guide channels 2 in the rear zone 103 increase the path and range of liquid diffusion, better handling backward liquid flow and enhancing the leak-proof capability of the rear zone 103. The gradually decreasing spacing between the guide channels 2 in the rear zone 103 further strengthens the guiding effect on the liquid during flow in the rear zone 103, effectively concentrating the liquid in the rear region of the absorbent core layer 12, preventing backward leakage, optimizing liquid distribution in the rear zone 103, and improving absorption efficiency.

[0042] In this embodiment, a secondary guide channel 8 is pressed into the rear area 103 on the upper surface of the sanitary product body 1, with both ends connected to the guide channel 2. The secondary guide channel 8 does not contain through holes. The secondary guide channel 8 is distributed on the lateral outer side of the guide channel 2, which can more effectively guide the liquid to diffuse in the rear of the sanitary product body 1, prevent the liquid from accumulating locally, further improve the absorption capacity of the rear of the sanitary product body 1, and enhance the overall leak-proof effect.

[0043] Furthermore, the second strip groove 6 has an inverted "V" shape, with its V-shaped opening facing the tail of the rear area 103. The second strip groove 6 is generally arranged in the transverse direction, and each of the second strip grooves 6 is spaced apart in the longitudinal direction. The first strip groove 5 and the second strip groove 6 are distributed within the guide groove 2. The inverted "V" shaped structure of the second strip groove 6 not only prevents liquid from leaking backward but also better guides the liquid to diffuse downwards and to both sides, making the liquid more evenly distributed at the tail of the absorbent layer rear area 103, further enhancing the leak-proof capability of the rear area. The second strip grooves 6, spaced apart in the longitudinal direction, can provide multi-stage blocking and guidance according to the liquid flow rate and distribution, improving the reliability of the leak-proof effect.

[0044] It should be noted that the absorbent core layer 12 mentioned above can also be an integral core or a suspended core. The integral core refers to a thin, soft, fast-absorbing, and glue-free core structure that is uniformly pressed together by a one-time molding process of non-woven fabric, fiber layer and super absorbent polymer. The suspended core refers to a core inside the sanitary napkin that is not bonded to the bottom leak-proof layer as a whole, but is only bonded to the bottom layer in the middle of the core, with the left and right sides "suspended" above the leak-proof layer.

[0045] A method for preparing a disposable sanitary product with perforated and strip-shaped structures as described above includes the following steps:

[0046] Step 1, Pre-treatment of the absorbent core layer 12: 1) Unfold and transport the prepared absorbent core layer 12, defining the direction of transport of the absorbent core layer 12 as the longitudinal direction and the direction of width of the absorbent core layer 12 as the transverse direction; 2) Processing of the first through holes 4: Several first through holes 4 without absorbent material are opened at intervals on the absorbent core layer 12, and the several first through holes 4 are distributed in a ring-shaped interval; 3) Processing of the first strip grooves 5: Two first strip grooves 5 without absorbent material are opened in the middle area of ​​the absorbent core layer 12. The first strip grooves 5 are basically set in the longitudinal direction and are distributed in the transverse direction at intervals. The distance between adjacent first strip grooves 5 is ≥10mm. The length of each first strip groove is 10-100mm and the width is 1-10mm; 4) Processing of the second strip grooves 6: Three second strip grooves 6 without absorbent material are opened in the rear area of ​​the absorbent core layer 12.

[0047] Step 2, Forming of the absorbent unit continuum: The liquid-permeable surface material in roll form is continuously unwound and conveyed, and the surface facing the absorbent core layer 12 is uniformly coated with adhesive. Then, the absorbent core layer 12 obtained in Step 1 is laid in the middle of the transverse direction of the liquid-permeable surface layer 11. After that, the transverse edges of the liquid-permeable surface layer 11 are wrapped around the transverse edges of the absorbent core layer 12 and folded to cover the transverse edges of the other side of the absorbent core layer 12, finally forming a three-layer structure consisting of the liquid-permeable surface layer 11, the absorbent core layer 12, and the folded covering part of the liquid-permeable surface layer 11, i.e., the absorbent unit continuum.

[0048] Step 3, pressing the guide groove 2: Apply pressure to the absorption unit continuous body obtained in step 2 in the position direction between adjacent first through holes 4 to press out a number of first grooves 3, with the first through holes 4 and the first grooves 3 distributed at intervals.

[0049] Step 4, Pre-treatment of impermeable bottom layer 13 and water-repellent material layer 14: Unwind the roll of impermeable bottom layer material and continuously convey it, apply adhesive evenly to the surface facing the absorbent core layer 12, and then composite the water-repellent material layer 14 on both sides of the impermeable bottom layer 13.

[0050] Step 5, Composite Process: The composite of the impermeable bottom layer 13 and the water-repellent material layer 14 treated in Step 4 is further locally coated with adhesive on the inner edge area of ​​the water-repellent material layer 14 on both sides. Then, the impermeable bottom layer 13 is precisely coated with the absorbent unit continuum from Step 3. During the coating process, it is ensured that the coated area of ​​the water-repellent material layer 14 covers the inner edge area of ​​the folded covering part of the liquid-permeable surface layer 11, forming a multi-layer composite structure including the liquid-permeable surface layer 11, the absorbent core layer 12, the impermeable bottom layer 13, and the water-repellent material layer 14.

[0051] Step 6, Slitting and Shaping: The multi-layered composite continuous obtained in Step 5 is slid along the preset boundary between two adjacent absorbent units to finally form a single sanitary product body.

[0052] The first through hole 4, the first strip groove 5, and the second strip groove 6 are excavated by setting protrusions of corresponding structures in the mold cavity of the forming mold wheel, so that the corresponding shape is left empty during the accumulation of the absorbent material; of course, it can also be formed by punching, cutting, ultrasonic drilling, or other online drilling methods on the absorbent layer to form the corresponding shape.

[0053] This preparation method details the entire process from preparing the liquid-permeable top layer 11, absorbent core layer 12, and liquid-impermeable bottom layer 13, to bonding the three layers together, pressing the flow channel 2, and slitting the product. Each step has clearly defined operational content and sequence, ensuring the standardization and normalization of the production process, which is beneficial to improving product quality and production efficiency. Furthermore, in preparing the absorbent core layer 12, the absorbent material is laid after the upper sheet is treated with adhesive, and a second strip groove 6 is carved out on one side of the absorbent layer before the lower sheet is laminated. This precise preparation process can accurately realize the structural design of the absorbent core layer 12, ensuring the accurate position and size of key structures such as the flow channel 2, the first through hole 4, and the second strip groove 6, thereby ensuring that the sanitary product has good liquid absorption and diffusion performance. Pressing the flow channel 2 along a specific direction on the laminated product can accurately align the flow channel with the through hole on the absorbent layer, allowing the flow channel to better guide liquid diffusion and further improving the overall performance of the sanitary product.

[0054] The aforementioned sanitary product body 1 has a drying rate of not less than 4 g / h, wherein the drying rate is equal to the fitting curve of the ratio of the amount of test liquid absorbed by the product to time at consecutive test time points, and is not less than 1.5 times the diffusion ratio, wherein the diffusion ratio is equal to the ratio of the maximum longitudinal diffusion length of the liquid bottom layer to the maximum longitudinal diffusion length of the surface layer. The test indicators are as follows:

[0055] Drying time: Lay the product flat on a table, add 5 ml of test solution, and start timing while adding the liquid. Record the drying time after the test solution is completely absorbed into the core layer.

[0056] Drying rate: Sample addition: Add 5.0g of test solution precisely to the center area of ​​the surface of the product to be tested in one go;

[0057] Timing and Sampling: At preset time points of 15s, 30s, 60s, 1min, and 2min after the test liquid comes into contact with the product surface, until the drying time, the mass of residual blood on the product surface is tested and weighed.

[0058] Calculation: For the instantaneous rate values ​​of (5g - residual amount) / time calculated at different time points, plot the relationship curve of drying time - absorption amount. By minimizing the sum of squared errors, find the linear regression equation that best matches the test data points. The slope is the drying rate.

[0059] Infiltration rate: Lay the sample flat on a table, add 5ml of test blood, and start timing while adding the liquid. Record the infiltration time after the test blood is completely absorbed into the core layer.

[0060] Diffusion length: The diffusion length of the core layer after the blood is completely absorbed into the core layer is determined by laying the core flat on the table and adding 5 ml of animal blood.

[0061] The product was tested using the test methods described above, as well as the test methods for seepage and rewetting of the sanitary product itself. The test data are as follows:

[0062]

[0063]

[0064] Furthermore, a number of needle holes 7 are provided in the front area 101 and the middle area 102 on the upper surface of the sanitary product body 1. The needle holes 7 increase the liquid permeability of the sanitary product surface, allowing the liquid to pass through the liquid-permeable surface layer 11 and enter the absorbent core layer 12 more quickly, thereby increasing the infiltration rate and improving the overall absorption efficiency of the sanitary product. Specifically, each of the needle holes 7 is distributed in the flow channel 2 of the annular structure. The sanitary product body 1 has a longitudinal absorption efficiency of not less than 6 mm / s. The longitudinal absorption efficiency is equal to the ratio of the maximum longitudinal diffusion length of the liquid to the infiltration rate.

[0065] The sanitary product body 1 has a diffusion length of not less than 6%, preferably not less than 8%, and the diffusion length is the ratio of the longitudinal diffusion length of the liquid to the longitudinal diffusion length of the liquid of the sanitary product body without this design structure (i.e. without the first through hole 4 and the second through hole 5).

[0066] Furthermore, the needle holes 7 include a first group of needle holes 71 distributed along the transverse central axis of the sanitary product body 1 and an even number of second groups of needle holes 72 extending laterally from the first group of needle holes 71 to both sides. This distribution allows the needle holes to cover a wide area of ​​the sanitary product surface. No matter where the liquid falls on the sanitary product, it can quickly penetrate into the absorbent core layer 12 through the needle holes 7, improving the overall infiltration speed and absorption efficiency, while ensuring the uniformity of liquid penetration.

[0067] Example 2:

[0068] refer to Figure 3As shown, a disposable sanitary product with perforated and strip-shaped structures includes a sanitary product body 1. The longitudinal direction is defined as extending along the length of the sanitary product body 1, and the transverse direction is defined as extending along the width of the sanitary product body 1. The sanitary product body 1 has a front area 101, a middle area 102, and a rear area 103 along the longitudinal direction. The sanitary product body 1 includes a liquid-permeable surface layer 11, an absorbent core layer 12, and a liquid-impermeable bottom layer 13. The absorbent core layer 12 includes an upper sheet, a lower sheet, and an absorbent layer sandwiched between the upper and lower sheets. The upper and lower sheets are both non-woven fabric layers. The absorbent material can be toilet paper. The absorbent layer includes absorbent material, which can be a mixture of fluff pulp and superabsorbent polymer particles, or a mixture of fluff pulp, superabsorbent polymer particles and absorbent fibers. The upper surface of the sanitary product body is pressed with a guide groove 2, which has an annular structure. The guide groove 2 has several spaced first grooves 3. The absorbent core layer 12 is provided with several first through holes 4 without absorbent material at intervals along the guide groove 2. The first through holes 4 are distributed between two adjacent first grooves 3, and the first through holes 4 and the first grooves 3 are spaced apart.

[0069] The middle region 102 of the absorbent core layer 12 is provided with two liquid-passing grooves. The liquid-passing grooves are composed of through-hole rows with a through-hole area greater than 50%. The through-hole grooves 5 are formed by several through-holes arranged in a row. The through-hole area in the through-hole groove is greater than 50% of the area of ​​the through-hole groove. The through-hole grooves 5 are basically arranged in the longitudinal direction and are distributed laterally at intervals. The "basically arranged in the longitudinal direction" means that they are distributed in the longitudinal direction in a general direction, and are not necessarily straight or arc-shaped or other regular structures. The length of the through-hole grooves 5 is 10-100mm, preferably 85mm, and the width is 1-10mm, preferably 7mm. The spacing between the laterally distributed through-hole grooves 5 is ≥10mm. The rear region 103 of the absorbent core layer 12 is provided with two second strip-shaped grooves 6 without absorbent material.

[0070] The sanitary product body 1 has a drying rate of not less than 4 g / h, the drying rate being equal to the fitting curve of the ratio of the amount of test liquid absorbed by the product to the time at consecutive test time points, and a diffusion ratio of not less than 1.5 times, the diffusion ratio being equal to the ratio of the maximum longitudinal diffusion length of the liquid bottom layer to the maximum longitudinal diffusion length of the surface layer.

[0071] The sanitary product body 1 has a diffusion length increase of not less than 6%, preferably not less than 8%, and the diffusion length increase is the ratio of the liquid longitudinal diffusion length dimension to the liquid longitudinal diffusion length dimension of the sanitary product body without this design structure (i.e. without the first through hole 4).

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A disposable sanitary product with perforated and strip-shaped components, comprising a sanitary product body, defined as extending longitudinally along the length direction of the sanitary product body and laterally along the width direction of the sanitary product body, the sanitary product body having a front area, a middle area, and a rear area along the longitudinal direction, the sanitary product body comprising a liquid-permeable surface layer, an absorbent core layer, and a liquid-impermeable bottom layer, characterized in that: The upper surface of the sanitary product body is pressed with a flow guide groove. The first flow guide groove has several spaced first grooves. The absorbent core layer is provided with several first through holes without absorbent material at intervals along the flow guide groove. The first through holes are distributed between two adjacent first grooves and are spaced apart from the first grooves. The middle area of ​​the absorbent core layer is provided with at least two liquid passage grooves. The liquid passage groove is a first strip groove without absorbent material or a row of through holes with a through hole area greater than 50%. The liquid passage groove is basically arranged in the longitudinal direction and distributed laterally at intervals. The length of the liquid passage groove is 10-100mm and the width is 1-10mm. The spacing between the laterally distributed liquid passage grooves is ≥10mm. The rear area of ​​the absorbent core layer is provided with at least one second strip groove without absorbent material. The sanitary product body has a drying rate of not less than 4 g / h, the drying rate being equal to the fitting curve of the ratio of the amount of test liquid absorbed by the product to time at consecutive test time points, and a diffusion ratio of not less than 1.5 times, the diffusion ratio being equal to the ratio of the maximum longitudinal diffusion length of the liquid bottom layer to the maximum longitudinal diffusion length of the surface layer.

2. The disposable sanitary product with perforated and strip-shaped structures according to claim 1, characterized in that: The second strip groove is basically arranged in the transverse direction. The second strip groove has an inverted "V" shape structure, and the V-shaped opening of the second strip groove faces the tail of the rear area. Each of the second strip grooves is distributed at intervals in the longitudinal direction. The liquid passage groove and the second strip groove are distributed within the annular guide groove.

3. The disposable sanitary product with perforated and strip-shaped features according to claim 1, characterized in that: The absorbent core is a multi-layer composite absorbent core, including a non-woven fabric layer, a mixed layer of fluff pulp and ES fiber, a mixed layer of fluff pulp and superabsorbent polymer, and a toilet paper or non-woven fabric layer.

4. The disposable sanitary product with perforated and strip-shaped features according to claim 1, characterized in that: The width of the absorbent core layer in the middle region is 50-80mm, the width of the absorbent core layer in the front and rear regions is ≥70mm, and the width of the absorbent core layer in the rear region is ≥ the width of the absorbent core layer in the middle region.

5. The disposable sanitary product with perforated and strip-shaped features according to claim 1, characterized in that: The liquid-permeable surface layer partially encapsulates the absorbent core layer. This surface layer encapsulates the side of the absorbent core layer facing the human body, the two lateral sides of the absorbent core layer, and the two lateral sides of the side of the absorbent core layer facing away from the human body. The lateral center of the absorbent core layer facing away from the human body is not encapsulated by the liquid-permeable surface layer and is directly bonded to the impermeable bottom layer. A water-repellent material layer is provided between the liquid-permeable surface layer and the impermeable bottom layer below the absorbent core layer. One side of the water-repellent material layer is bonded to the inner surface of the liquid-permeable surface layer below the absorbent core layer. However, there is no bond between the water-repellent material layer and the liquid-permeable surface layer in the lateral areas corresponding to the liquid-permeable surface layer below the absorbent core layer. Meanwhile, the other side of the water-repellent material layer is bonded to the impermeable bottom layer.

6. The disposable sanitary product with perforated and strip-shaped features according to claim 1, characterized in that: The sanitary product body has an infiltration efficiency of not less than 0.70 ml / s, whereby the infiltration efficiency is equal to the ratio of liquid absorption to infiltration rate.

7. The disposable sanitary product with perforated and strip-shaped features according to claim 1, characterized in that: The upper surface of the sanitary product body has a number of needle holes in the front and middle areas, and each needle hole is distributed in an annular guide groove.

8. The disposable sanitary product with perforation and strip shape according to any one of claims 1 to 8, characterized in that: The rear area on the upper surface of the sanitary product body is pressed with a secondary guide channel at both ends, which is connected to the guide channel respectively. The secondary guide channel does not contain through holes and is distributed on the lateral outer side of the annular guide channel.

9. A method for preparing a disposable sanitary product with a perforated and strip-shaped structure as described in claim 1, characterized in that: Includes the following steps: Step 1, Pre-treatment of the absorbent core layer: 1) Unfold and transport the prepared absorbent core layer, defining the direction of transport as the longitudinal direction and the direction of width as the transverse direction; 2) First through-hole processing: Open several first through-holes without absorbent material at intervals on the absorbent core layer, with the several first through-holes distributed in a ring-shaped interval; 3) Liquid channel processing: Open at least two first strip-shaped channels without absorbent material or through-hole rows with an area greater than 50% in the middle area of ​​the absorbent core layer to form a through-hole channel, the liquid channel is basically set along the longitudinal direction and distributed at intervals in the transverse direction, the distance between adjacent liquid channels is ≥10mm, the length of each liquid channel is 10-100mm, and the width is 1-10mm; 4) Second strip-groove processing: Open at least one second strip-groove without absorbent material in the rear area of ​​the absorbent core layer; Step 2, Forming of the absorbent unit continuum: The liquid-permeable surface material in roll form is continuously unwound and conveyed, and the surface facing the absorbent core layer is uniformly coated with adhesive. Then, the absorbent core layer obtained in Step 1 is laid in the middle of the transverse direction of the liquid-permeable surface layer. After that, the transverse edges of the liquid-permeable surface layer are wrapped around the transverse edges of the absorbent core layer and folded to cover the transverse edges of the absorbent core layer on the other side, finally forming a three-layer structure consisting of the liquid-permeable surface layer, the absorbent core layer, and the folded covering part of the liquid-permeable surface layer, i.e., the absorbent unit continuum. Step 3, pressing of annular guide grooves: Apply pressure to the absorption unit continuum obtained in step 2 in the positional direction between adjacent first through holes to press out a number of first grooves, with the first through holes and the first grooves distributed at intervals. Step 4, Pre-treatment of impermeable base layer and water-repellent material layer: Unwind the roll of impermeable base material and continuously convey it, apply adhesive evenly to the surface facing the absorbent core layer, and then laminate water-repellent material layers on both sides of the impermeable base layer. Step 5, Composite Process: For the composite of the impermeable bottom layer and the water-repellent material layer treated in Step 4, local adhesive application is performed on the inner edge area of ​​the water-repellent material layer on both sides of its lateral direction. Then, the impermeable bottom layer is precisely composited with the continuous absorbent unit from Step 3. During the composite process, it is ensured that the adhesive-treated area of ​​the water-repellent material layer covers the inner edge area of ​​the folded cover portion of the liquid-permeable surface layer, forming a multi-layer composite structure including a liquid-permeable surface layer, an absorbent core layer, an impermeable bottom layer, and a water-repellent material layer. Step 6, Slitting and Shaping: The multi-layered composite continuous obtained in Step 5 is slid along the preset boundary between two adjacent absorbent units to finally form a single sanitary product body.

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