Slotting type absorption core body and hygienic product

Abstract

The utility model relates to the field of hygienic products, in particular to a kerf type absorption core and a hygienic product, which comprises an absorber and a wrapping layer wrapped outside the absorber. A kerf is formed in the absorption body, extends downwards from the top of the absorption body, and at least extends downwards to the middle and below of the absorption body; the kerfs include a main kerf. According to the scheme, the downward diffusion and infiltration speed of the liquid of the absorption core body is increased, the purpose of rapidly absorbing urine is achieved, the time for the urine to soak the skin is shortened, the urine leakage probability is reduced, the adverse effect caused by gel blockage is reduced, the influence on the comfort of the absorption core body is reduced, and the comfort of the hygienic product is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of hygiene products, specifically to a slit-type absorbent core and hygiene products. Background Technology

[0002] Hygiene products include diapers, pull-up pants, and sanitary napkins. These products all contain absorbent cores, which are an important component of hygiene products and are mainly used to absorb liquid excretions.

[0003] The surface of the absorbent core is made of non-woven fabric, and the absorbent material wrapped inside the non-woven fabric is made of absorbent material. Traditionally, the absorbent material of absorbent cores is fluff pulp, which absorbs liquids. Currently, in order to increase the liquid absorption capacity, absorbent cores generally add superabsorbent resins with stronger water absorption capabilities. By adding superabsorbent resins, the water absorption and retention capacity of the absorbent core can be enhanced.

[0004] However, when absorbent resin is added, it expands upon contact with liquid, forming a gel-like substance. This gel hinders the diffusion of liquid in all directions, affecting its penetration and causing blockage. Therefore, urine absorption is currently relatively slow, and the absorption time is generally long. Related studies show that for adult men, the average urination time is approximately 5-10 seconds, with a peak urine flow rate of 20-40 ml / s and a total urine volume of 200-400 ml per urination. For adult women, the average urination time is approximately 7-15 seconds, with a peak urine flow rate of approximately 10-20 ml / s and a total urine volume of 150-300 ml per urination. For infants (1-3 years old), urination time is even shorter than for adults, generally completed within 10 seconds, with a single urine volume of approximately 50-150 ml. However, current statistical results on the absorption speed of superabsorbent polymers (SAPs) and saline solution show that the fastest absorption time is 20.7 seconds, the slowest is 64.2 seconds, the median is 30 seconds, and the average is 34.15 seconds. Therefore, for infants, the fact that urine is mostly expelled within 10 seconds does not mean that the urine has been completely absorbed by the absorbent core within that time. The time it takes for the absorbent core to absorb urine is much longer than the urination time. This prolonged urine absorption time has the following disadvantages: the core surface remains moist for a longer period, urine is soaked in the skin for a longer time, which can easily cause skin rashes, and the inability to absorb urine quickly increases the probability of leakage in sanitary products. Therefore, it is still necessary to continue to improve the rate of urine absorption and seepage, reduce the urine absorption time, and reduce the time difference between urination and urine absorption.

[0005] In addition, infants urinate relatively frequently (for example, infants under 1 year old urinate about 6-10 times a day, usually every 2-3 hours). Therefore, when using sanitary products for infants, after the first two urinations, the part of the absorbent core that is in contact with the infant's skin will become clogged due to the absorption of liquid first. This affects the downward diffusion and seepage speed of subsequent urinations. As a result, the urine in the subsequent urinations cannot diffuse and seep down quickly, and the surface of the sanitary product is relatively damp. In order to reduce the impact of dampness on the skin, the sanitary product needs to be replaced earlier. At this time, the part of the sanitary product that is away from the skin has not yet fully absorbed the liquid, resulting in low utilization of the absorbent core and waste of sanitary products.

[0006] To address the aforementioned technical problems, existing technologies typically employ the method of setting up flow channels. For example, Chinese invention patent application CN113730108A discloses a diaper core and its preparation method. This patent improves flow efficiency and increases polymer utilization by setting up special flow channels. However, the flow channel method involves mold pressing, making the manufacturing process relatively complex. Furthermore, the mold pressing compacts the absorbent core, resulting in greater hardness and significantly reducing its softness and comfort. Utility Model Content

[0007] The present invention aims to provide a slit-type absorbent core and sanitary products to increase the speed of downward diffusion and seepage of liquid in the absorbent core, thereby achieving the purpose of rapid urine absorption, reducing the time that urine soaks the skin, and reducing the probability of urinary leakage.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a slit-type absorbent core, comprising an absorbent body and a wrapping layer covering the absorbent body; at least the absorbent body is provided with a slit, the slit extending downward from the top of the absorbent body, the slit extending downward to at least the middle and below of the absorbent body; the slit includes a main slit.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a sanitary product, including a slit-type absorbent core.

[0010] The principle and advantages of this patented solution are as follows: The absorbent body in this patent has slits, which are gaps left after the absorbent body is cut. These slits reduce the resistance to liquid seepage, allowing the liquid to seep down quickly. This increases the speed at which the liquid diffuses and seeps downwards from the absorbent core, allowing urine to be absorbed by the core in a shorter time after being excreted from the body. This reduces the time urine remains on the core surface, achieving rapid urine absorption, reducing the time urine soaks the skin, and decreasing the probability of leakage in sanitary products.

[0011] Furthermore, because the slits extend downwards from the top of the absorbent body, and at least to the middle and below, when the sanitary product is worn, during the first few times the body excretes fluid, the cuts leave larger pores, reducing the resistance to fluid seepage. This allows the fluid to quickly seep downwards, increasing the speed at which the fluid diffuses and seeps into the absorbent core. The fluid diffuses promptly to the middle and below of the absorbent core, with less fluid remaining in the upper part and less swelling near the skin. The middle and below absorb the largest amount of fluid first, causing them to expand initially. As the body continues to excrete fluid, the upper part of the absorbent core absorbs more fluid and expands. Therefore, the absorbent core in this patent mainly expands from the middle and lower parts of the absorbent core. As the number of urinations increases, the expansion sequence of the internal material of the absorbent core is mainly from bottom to top, rather than from top to bottom. This is the opposite of the expansion sequence of the absorbent core after absorbing liquid in the prior art. This avoids the problem of slow urine seepage caused by gel blockage due to the upper part of the absorbent core absorbing liquid first during the first few urinations.

[0012] This patented solution allows urine to quickly seep down through the slits after excretion, resulting in less liquid residue on the surface of the absorbent core that contacts the skin, keeping the area dry and significantly improving comfort. Furthermore, after excretion, the liquid preferentially diffuses and seeps down into the middle and lower parts of the absorbent core through the slits, ensuring full utilization of the absorbent core and reducing waste.

[0013] In addition, compared with the prior art, this patented solution uses a slit-cutting method to guide the flow downwards, which is different from the existing technology that uses a flow channel. It does not require a mold to press out the flow channel; it can be done simply by cutting with a blade. The slit-cutting production process is simpler and faster than the flow channel production process, which helps to improve production efficiency and reduce mold costs.

[0014] Furthermore, compared to existing technologies, this patented solution uses a slit-cut method for downward flow guidance, rather than a flow channel method. This eliminates the need for a mold to press out the flow channel, thus avoiding the need for the absorbent body to be squeezed by pressure rollers. The absorbent body becomes more porous and soft, resulting in a more comfortable contact between the absorbent core and the human body. Simultaneously, the porous absorbent body also facilitates liquid infiltration, increasing the infiltration rate and reducing expansion in the upper part of the absorbent core.

[0015] This slit-type absorbent core and hygiene products are particularly effective for infants who urinate frequently, and are expected to be popular in the baby market. Of course, this slit-type absorbent core and hygiene products are not limited to infants; they can also be used by adults.

[0016] Preferably, as an improvement, the slit further includes a secondary slit extending along the width direction of the absorber, the secondary slit being connected to the main slit.

[0017] Therefore, the main slit in this patent is mainly used for vertical flow guidance of the liquid, allowing the liquid to quickly seep down into the absorbent core. The secondary slit is used for horizontal flow guidance of the liquid, making the diffusion resistance of the liquid in the width direction of the absorbent core smaller. In this way, after the liquid diffuses and seeps downward, it will also diffuse horizontally along the secondary slit, allowing the absorbent core to fully absorb the liquid in its width direction, thereby improving the utilization rate of the absorbent core in the width direction.

[0018] Preferably, as an improvement, the width of the slit gradually decreases from top to bottom of the absorbent body. Thus, the slit width is larger closer to the top of the absorbent body and smaller closer to the bottom. The reason for setting a relatively larger slit width closer to the top of the absorbent body is that after the liquid is discharged from the body, it can seep downwards more quickly through the wider slit, which helps to increase the infiltration rate of the liquid, reduce the time the liquid stays in the upper part of the absorbent body, and reduce the expansion caused by the absorption of liquid in the upper part of the absorbent body.

[0019] Preferably, as an improvement, the number of slits in the absorber gradually increases from top to bottom.

[0020] Therefore, the number of slits decreases closer to the top of the absorbent core and increases closer to the bottom. This arrangement is because the primary function of the slits is to allow the liquid to diffuse along the width of the absorbent core, while the slits at the top of the absorbent core mainly facilitate downward diffusion. The upper part of the absorbent core should have relatively fewer slits to reduce lateral diffusion and absorption, preventing the liquid from expanding and hindering downward permeation. Once the liquid has permeated to the lower and middle parts of the absorbent core, it undergoes sufficient lateral diffusion through a larger number of slits, ensuring that a significant portion of the lower and middle parts of the absorbent core absorbs the liquid. Thus, this design prioritizes liquid absorption and lateral diffusion at the bottom of the absorbent core over at the top, causing the lower part to absorb liquid and expand first, followed by the upper part.

[0021] Preferably, as an improvement, the absorber gradually increases in length from top to bottom along the slit length.

[0022] Therefore, the closer to the top of the absorbent body, the shorter the length of the slit; the closer to the bottom, the longer the slit. This design is because the slit primarily allows the liquid to diffuse along the width of the absorbent core, while the slit at the top mainly diffuses the liquid downwards. The slit length at the top of the absorbent body should be relatively short to reduce lateral diffusion and prevent the liquid from being fully absorbed and expanding, thus hindering downward permeation. Once the liquid has permeated to the lower middle section of the absorbent body, it then diffuses laterally through the longer slit, ensuring that a larger portion of the lower middle section absorbs the liquid. Thus, this design prioritizes liquid absorption and lateral diffusion at the bottom of the absorbent body over at the top; the bottom absorbs liquid and expands first, while the top absorbs liquid and expands later.

[0023] Preferably, as an improvement, the main kerf is circular, wavy, or straight. Thus, the shape of the main kerf can be set in different ways.

[0024] Preferably, as an improvement, the absorber comprises multiple layers of sub-absorbers, which are sequentially composited from top to bottom, with each layer of sub-absorbers having the aforementioned slits. Thus, multiple sub-absorbers are composited to form the entire absorber. The sub-absorbers can be individually cut into batches, and after cutting, the different sub-absorbers are then composited.

[0025] Preferably, as an improvement, the lower absorbent layer has more transverse fibers than the upper absorbent layer; the upper absorbent layer has more vertical fibers than the lower absorbent layer. Transverse fibers facilitate lateral liquid diffusion, while vertical fibers facilitate vertical liquid diffusion. Thus, the absorbent layer is configured with different layers so that the fiber arrangement of the absorbent layers can be inconsistent. The upper absorbent layer has more vertical fibers than the lower absorbent layer, resulting in a stronger downward liquid conduction capacity, allowing the liquid to quickly permeate to the lower absorbent layer. Conversely, the lower absorbent layer has more transverse fibers than the upper absorbent layer, resulting in a relatively weaker lateral liquid diffusion capacity. This means that after liquid exits the absorbent layer, it primarily conducts downwards along the vertical fibers rather than diffusing laterally. Once the liquid reaches the lower absorbent layer, it then diffuses laterally along the transverse fibers.

[0026] Preferably, as an improvement, the uppermost absorbent layer has only the main slit; from the second absorbent layer downwards, the length of the slit gradually increases or the number of slits gradually increases in each layer.

[0027] Therefore, the uppermost absorbent layer only has the main slit, and no secondary slits. This allows the liquid to quickly seep downwards through the main slit after being discharged from the body, preventing lateral diffusion of the liquid on the uppermost absorbent layer, which would have been possible without secondary slits. From the second absorbent layer downwards, the length or number of secondary slits in each layer gradually increases. This is to ensure that the lowermost absorbent layer has the strongest lateral diffusion capacity, guaranteeing sufficient liquid dispersion. The lateral diffusion capacity of the other absorbent layers increases sequentially from top to bottom, resulting in an uneven priority for lateral diffusion from bottom to top (lower absorbent layers have priority over upper absorbent layers). This causes the absorbent layers to absorb liquid and expand primarily in a bottom-to-top sequence.

[0028] Preferably, as an improvement, the number of layers of the absorber is 3-5. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the absorber structure in Example 1.

[0030] Figure 2 for Figure 1 A schematic diagram of the absorber from a top view, showing that the main slit is circular.

[0031] Figure 3 for Figure 1 A top-view structural diagram of the absorber, showing that the main slit is wavy.

[0032] Figure 4 for Figure 1 A top-view structural diagram of the absorber, showing the main slit as a straight line extending in an inclined direction.

[0033] Figure 5 for Figure 1 A top-view structural diagram of the absorber, showing the main slit as a straight line extending along the length of the absorber.

[0034] Figure 6 This is a schematic diagram of the structure of the multilayer absorber in Examples 2-5.

[0035] Figure 7 for Figure 6 Top view of the first layer (Example 2).

[0036] Figure 8 for Figure 6 Top view of the second layer in Example 2.

[0037] Figure 9 for Figure 6 Top view of the second layer in Example 2.

[0038] Figure 10 for Figure 6 Top view of the first layer (Example 3).

[0039] Figure 11 for Figure 6 Top view of the second layer in Example 3.

[0040] Figure 12 for Figure 6 Top view of the third layer in Example 3.

[0041] Figure 13 for Figure 6 (Example 4) Top view of the first layer.

[0042] Figure 14 for Figure 6 Top view of the second layer in Example 4.

[0043] Figure 15 for Figure 6 Top view of the third layer in Example 4.

[0044] Figure 16 for Figure 6 Top view of the first layer (Example 5).

[0045] Figure 17 for Figure 6 Top view of the second layer in Example 5.

[0046] Figure 18 for Figure 6 Top view of the third layer in Example 5. Detailed Implementation

[0047] The following detailed description illustrates the specific implementation method:

[0048] The reference numerals in the accompanying drawings include: absorber 1, first layer absorber 2, second layer absorber 3, third layer absorber 4, main slit 5, secondary slit 6. Example 1

[0049] The basics are as follows: Figures 1-5 As shown: This embodiment discloses a sanitary product, which can be a diaper, pull-up pants or sanitary napkin. The sanitary product is provided with an absorbent core. The inventive point of this embodiment is that the absorbent core is a slit-type absorbent core.

[0050] This embodiment of a slit-type absorbent core includes an absorbent body 1 and a wrapping layer (not shown in the figure) surrounding the absorbent body 1. The absorbent body 1 is made of a water-absorbing material, which includes not only absorbent resin but also other components, such as fluff pulp. The absorbent body 1 is used to absorb liquids. The wrapping layer is a non-woven fabric. All of the above structures of the slit-type absorbent core are prior art.

[0051] The improvement of this embodiment is that a slit is provided on the absorbent body 1, the slit extends downward from the top of the absorbent body 1, the slit extends downward to at least the middle part and below of the absorbent body 1, and in this embodiment the slit extends downward to the bottom of the absorbent body 1.

[0052] Setting up the slit is relatively simple; a slit is the gap left after cutting the absorbent body 1. Therefore, a cutter is inserted into the existing absorbent body 1 from its upper surface to obtain an absorbent body 1 with a slit. Alternatively, when creating the slit, the absorbent body 1 can be wrapped with non-woven fabric first, and then the cutter can be inserted vertically through the non-woven fabric into the absorbent body 1, thus forming a slit on both the absorbent body 1 and the non-woven fabric. After the slit is created, another layer of non-woven fabric can be wrapped around the outside of the absorbent body 1 to cover any damage to the non-woven fabric caused by the cut.

[0053] Through the aforementioned improvements, the sanitary products, when worn on the body, have slits that reduce resistance to liquid seepage, thereby increasing the rate of urine seepage and reducing the time urine remains on the core surface, resulting in faster absorption of urine by the core. Simultaneously, during the first two excretions, the reduced resistance to seepage allows the liquid to quickly seep through the slits, increasing the speed of downward diffusion and seepage of the liquid within the absorbent core. The liquid can then diffuse promptly towards the middle and lower parts of the absorbent core (the part furthest from the body during use). Less liquid is absorbed and retained in the upper part of the absorbent core (the part in contact with the body), resulting in less expansion in the area near the skin. The middle and lower parts of the absorbent core absorb a large amount of liquid initially, causing them to expand more initially. During subsequent excretions, the liquid is gradually absorbed by the upper part of the absorbent core, causing further expansion.

[0054] Therefore, in this embodiment, the absorbent core mainly expands from the middle and lower parts of the absorbent core. As the number of urinations increases, the expansion sequence of the material inside the absorbent core is mainly from bottom to top, rather than from top to bottom. This is the opposite of the expansion sequence of the absorbent core after absorbing liquid in the prior art. This avoids gel blockage caused by the upper part of the absorbent core absorbing liquid first in the first few urinations, and reduces the obstruction to the absorption of subsequent urinations.

[0055] Combination Figures 2-5As shown, in this embodiment, the slit is the main slit 5, and the function of the main slit 5 is to allow the liquid to seep down quickly. The main slit 5 can be set in different shapes, for example... Figure 2 5. The circular main slit in the middle Figure 3 5. The wavy main slit in the middle Figure 4 The straight lines and Figure 5 The straight line in the middle. Among them Figure 2 The main slits 5 are set as multiple, and are arranged and distributed along the length and width directions of the absorber 1. Figure 3 The wavy main slits 5 are set to three, and the length direction of the three main slits 5 is distributed along the length direction of the absorber 1. Figure 4 The main slits 5 are set at an angle, and the main slits 5 are set in two columns, with multiple main slits 5 in each column, and the two columns of main slits 5 are in a figure-eight shape. Figure 5 The main slits 5 are arranged in three rows, and the length direction of the main slits 5 is the same as the length direction of the absorber 1. Of course, in other embodiments, the main slits 5 can also be set in other shapes and distributions. In this embodiment, the slit width is 0.1-1mm.

[0056] As described above, the purpose of the slits in this embodiment is to facilitate liquid infiltration and prevent liquid from being absorbed first at the top of the absorber 1. To improve the liquid infiltration effect, the width of the slits near the top of the absorber 1 can be relatively large, gradually decreasing from top to bottom. For example, the slits on the absorber 1 are divided into three gradients: the slit width at the top of the absorber 1 is 0.5 mm, the slit width in the middle of the absorber 1 is 0.3 mm, and the slit width at the bottom of the absorber 1 is 0.1 mm. Different slit widths can be achieved by using cutters of different thicknesses. Example 2

[0057] This embodiment further optimizes Embodiment 1. In this embodiment, absorber 1 is composed of multiple sub-absorbers, with 3-5 layers of each sub-absorber. This embodiment describes three sub-absorbers in conjunction with… Figure 6 As shown, the absorber 1 in this embodiment is divided into three layers from top to bottom: a first layer of absorber 2, a second layer of absorber 3, and a third layer of absorber 4. The slits in the absorber 1 in this embodiment can be configured by first combining the three layers of absorber together and then cutting them with a cutter, or by first cutting the three absorber layers and then combining the three slit-covered absorber layers.

[0058] In this embodiment, the slit also includes secondary slits 6 extending along the width direction of the absorber 1. The secondary slits 6 are connected to the main slit 5, and the width of the secondary slits 5 is 0.1-1 mm. From top to bottom, the number of secondary slits 6 gradually increases, and the length of the secondary slits 6 gradually increases. Specifically, combined with... Figure 7 As shown, the first layer of absorbent body 2 only has a main slit 5, combined with Figure 8 As shown, the main slit 5 of the second layer absorber 3 is connected to the secondary slit 6, but the secondary slit 6 is only connected to the main slit 5 in the middle column, combined with Figure 9 As shown, the third layer of absorbers 4 has more slits 6 and the length of the slits 6 is longer.

[0059] In this embodiment, the cut 6 is straight, but in other embodiments, it can also be wavy.

[0060] Thus, in this embodiment, during the infant's first two urinations, the fluid, after being expelled from the body, rapidly seeps down through the main slit 5 from the first layer absorbent body 2 into the third layer absorbent body 4. Because the third layer absorbent body 4 has a large number of slits 6 and a relatively long length, the fluid rapidly diffuses laterally along the length of the slits 6, allowing the third layer absorbent body 4 to fully absorb the fluid. After several urinations, the third layer absorbent body 4 expands after absorbing the fluid. In contrast, the first layer absorbent body 2 lacks slits 6, and the second layer absorbent body 3 has only a few and shorter slits 6. Therefore, the lateral diffusion speed of the fluid through the first layer absorbent body 2 and the second layer absorbent body 3 is slower. Both the first layer absorbent body 2 and the second layer absorbent body 3 absorb less fluid and expand less. Since the first layer absorbent body 2 lacks slits 6, its expansion is minimal.

[0061] With each subsequent urination, the third absorbent layer 4 becomes saturated, leaving the liquid in the second absorbent layer 3. The liquid spreads laterally along the second absorbent layer 3 from the slit 6. The second absorbent layer 3 absorbs and expands, while the first absorbent layer 2 absorbs relatively less liquid than the second absorbent layer 3. The expansion of the first absorbent layer 2 is less than that of the second absorbent layer 3.

[0062] As the sanitary products continue to be used, the second absorbent layer 3 becomes saturated with liquid. After the baby's last few urinations, no more liquid enters the second absorbent layer 3; instead, the liquid is absorbed by the first absorbent layer 2, which expands after absorbing the liquid. Finally, the sanitary products on the baby should be replaced.

[0063] Therefore, it can be seen that the expansion sequence of the absorbent in this embodiment is that the third layer of absorbent 4 expands first, and the first layer of absorbent 2 expands last. The expansion sequence is from bottom to top, and the first layer of absorbent 2 will not expand first, thus avoiding the first layer of absorbent 2 expanding first and then becoming blocked, which would affect the seepage of the liquid.

[0064] Furthermore, since the absorber 1 in this embodiment is composed of multiple layers of absorbers, in other embodiments, each layer of absorber can be designed with different fiber orientations. For example, the third layer of absorber 4 has more transverse fibers than the second layer of absorber 3 has more transverse fibers than the first layer of absorber 2; the first layer of absorber 2 has more vertical fibers than the second layer of absorber 3 has more vertical fibers than the third layer of absorber 4. Vertical fibers are used to guide the liquid downwards, while horizontal fibers are used to guide the liquid across the width of absorbent body 1. This results in the third absorbent body 4 having a greater lateral diffusion capacity than the second absorbent body 3, which in turn has a greater lateral diffusion capacity than the first absorbent body 2. The first absorbent body 2 also has a greater vertical diffusion capacity than the second absorbent body 3, which in turn has a greater vertical diffusion capacity than the third absorbent body 4. This also helps ensure that when the infant urinates frequently, the liquid can quickly seep into the third absorbent body 4 and diffuse laterally, while the upper absorbent bodies absorb the liquid during subsequent urinations. Example 3

[0065] The difference between this embodiment and embodiment 2 is that the main slit 5 in embodiment 2 is circular, while in this embodiment, it is combined with... Figures 10-12 As shown, the shape of the main slit 5 is wavy. Example 4

[0066] The difference between this embodiment and embodiment 2 is that the main slit 5 in embodiment 2 is circular, while in this embodiment, it is combined with... Figures 13-15 As shown, the main slit 5 is a sloping straight line. Example 5

[0067] The difference between this embodiment and embodiment 2 is that the main slit 5 in embodiment 2 is circular, while in this embodiment, it is combined with... Figures 16-18 As shown, the main slit 5 is a straight line extending along the length of the absorber 1.

[0068] experiment

[0069] The following experimental data demonstrate that the slit-type absorbent core has good liquid absorption and permeation capabilities.

[0070] In Example 1 of this experiment, the main kerf is... Figure 5The shapes are shown. Comparative Example 1 uses an absorbent core without slits and without layering. Comparative Example 2 uses an absorbent core without slits, but it is layered, consisting of three layers. In other aspects, such as the total thickness, length, width, and material of the absorbent core, Examples 1-5 and Comparative Examples 1-2 are the same.

[0071] I. Liquid Absorption Time Experiment

[0072] By simulating real-world usage scenarios (such as urine flow rate and temperature), a measured amount of liquid is injected onto the surface of the absorbent core, and the time required for the liquid to be completely absorbed is recorded. The shorter the absorption time, the better the core's rapid absorption performance.

[0073] This experiment used 0.9% physiological saline (NaCl solution) to simulate urine, with the temperature controlled at 37±1℃. Food coloring was added to the liquid to enhance its visibility.

[0074] The equipment used includes: a constant flow pump to control the liquid flow rate (set to 10 mL / s to simulate the rate of infant urination); a stopwatch or electronic timer; and a test platform with a flat, non-slip support surface to ensure the absorbent core unfolds naturally.

[0075] Environmental conditions: Temperature: 23±2℃, Humidity: 50±5%.

[0076] Test Procedure: Lay the diaper flat on the test platform, ensuring the absorbent core is fully expanded. Use a constant flow pump to vertically inject liquid into the center area of ​​the core at a set flow rate, with each injection volume being 80mL (simulating a single urination). Start the timer the instant the liquid contacts the core surface and stop the timer when the liquid has completely permeated the core and there is no visible liquid residue on the core surface. Perform this test three times, injecting liquid in separate injections (each 5 minutes apart), and record the absorption time for each injection.

[0077] The final experimental results are recorded in the table below. As can be seen from the table, the liquid absorption time of the first to third times in Comparative Examples 1-2 decreased sequentially, while the first liquid absorption time in Examples 1-5 was the longest, the second liquid absorption time decreased, and the third liquid absorption time increased slightly. However, in any case, the liquid absorption time of each time in Examples 1-5 was shorter than that of each time in Comparative Examples 1-2, which shows that the liquid absorption speed of Examples 1-5 was improved, the liquid infiltration speed was fast, and the time spent was short.

[0078] frequency Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 first 10.14s 11.48s 9.70s 11.61s 9.58s 14.95s 14.86s The second 8.53s 8.73s 8.93s 8.28s 8.41s 14.45s 14.24s The third 8.98s 10.22s 9.54s 10.71s 9.27s 13.57s 13.43s

[0079] II. Experiment on the number of times liquid can be aspirated

[0080] Using the materials and equipment from the previous experiment, 80 ml of physiological saline was poured into each absorbent core using a constant flow pump (10 mL / s), with a 5-minute interval between each pour. The infiltration time was observed after each pour into the absorbent core. If the liquid remained on the surface of the absorbent core for more than 15 seconds, subsequent pouring was stopped. The following are the records of the number of times liquid could be absorbed in Examples 1-5 and Comparative Examples 1-2 (the instance exceeding 15 seconds in this experiment is not included). It can be seen that Examples 1-5 have better infiltration and absorption capabilities compared to Comparative Examples 1-2.

[0081] Grouping Number of times of aspiration Example 1 4 Example 2 5 Example 3 6 Example 4 5 Example 5 6 Comparative Example 1 3 Comparative Example 2 3

[0082] III. Appearance Test of Liquid Absorption by Absorbent Core

[0083] Using the materials and equipment from Experiment 1, 80 ml of physiological saline was poured into each absorbent core using a constant flow pump (10 mL / s), with a 5-minute interval between each pour. The infiltration time was observed after each pour; if the liquid remained on the absorbent core surface for more than 15 seconds, subsequent pouring was stopped. The expansion of the absorbent core was observed and touched after each absorption. The instances exceeding 15 seconds were not recorded. The expansion was subjectively categorized into four levels: A, B, C, and D, where A represents almost no expansion, B represents slight expansion, C represents moderate expansion, and D represents severe expansion, i.e., expansion severity A < B < C < D. The experimental data are recorded and summarized below. It can be seen that Examples 1-5 primarily showed expansion from bottom to top, while Comparative Examples 1-2 showed expansion from top to bottom.

[0084] frequency Part Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 1 Upper part (first layer) A A A A A B B 1 Middle section (second floor) A A A A A A A 1 Lower part (third layer) A A A A A A A 2 Upper part (first layer) A A A A A C C 2 Middle section (second floor) B A A A A B B 2 Lower part (third layer) C B B B B A A 3 Upper part (first layer) B A A B A D D 3 Middle section (second floor) C B B B B D C 3 Lower part (third layer) D C C C C B B

[0085] frequency Part Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 4 Upper part (first layer) D B B B B 4 Middle section (second floor) D C C C C 4 Lower part (third layer) D D C D D 5 Upper part (first layer) D B D C 5 Middle section (second floor) D C D D 5 Lower part (third layer) D D D D 6 Upper part (first layer) D D 6 Middle section (second floor) D D 6 Lower part (third layer) D D

[0086] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A slit-type absorbent core, comprising an absorbent body and a wrapping layer surrounding the absorbent body, characterized in that: The absorber has at least one slit, which extends downward from the top of the absorber to at least the middle and below of the absorber; the slit includes a main slit.

2. The slit-type absorbent core according to claim 1, characterized in that: The slit also includes a secondary slit extending along the width direction of the absorber, the secondary slit being connected to the main slit.

3. The slit-type absorbent core according to claim 1, characterized in that: The width of the slit gradually decreases from top to bottom in the absorber.

4. A slit-type absorbent core according to claim 2, characterized in that: The number of slits gradually increases from top to bottom in the absorber.

5. A slit-type absorbent core according to claim 2, characterized in that: The length of the slit gradually increases from top to bottom in the absorber.

6. A slit-type absorbent core according to claim 1, characterized in that: The main slit can be circular, wavy, or straight.

7. A slit-type absorbent core according to claim 2, characterized in that: The absorber comprises multiple layers of sub-absorbers, which are sequentially composited from top to bottom, and each sub-absorber layer has the aforementioned slit.

8. A slit-type absorbent core according to claim 7, characterized in that: The topmost absorber layer has only the main slit; from the second absorber layer downwards, the length of the slit gradually increases or the number of slits gradually increases in each layer.

9. A slit-type absorbent core according to claim 7, characterized in that: The number of layers of the absorber is 3-5.

10. Hygiene products, characterized in that: Includes a slit-type absorbent core as described in any one of claims 1-9.

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