A strong absorbent core

Abstract

The present application relates to the field of disposable sanitary products, in particular to a strong absorbent core, comprising a body, the body comprising a first non-woven fabric, a second non-woven fabric and a fluffy cotton clamped between the first non-woven fabric and the second non-woven fabric, an upper water-absorbing particle layer is arranged on the side of the fluffy cotton close to the first non-woven fabric, a lower water-absorbing particle layer is arranged on the side of the fluffy cotton close to the second non-woven fabric, the light transmittance of the body is 30% to 75%, and the uniformity of the body is 5% to 20%. The technical problem of distortion or low utilization caused by the unevenness of the absorption performance of the existing multi-layer absorbent is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of disposable sanitary products, in particular to a strong absorption core. BACKGROUND

[0002] At present, in the field of disposable sanitary products, multi-layered absorption bodies have been widely used. For example, a non-woven fabric absorption core disclosed in Chinese Patent Application No. CN202320998452.8 includes a body, the body includes an upper fiber layer, a lower fiber layer, and an intermediate fiber layer clamped between the upper fiber layer and the lower fiber layer, the upper fiber layer, the lower fiber layer, and the intermediate fiber layer are bonded to form a bonding part, the area of the bonding part accounts for 5-100% of the area of the body, the fiber thickness of the upper fiber layer and / or the lower fiber layer is 4-12D, the fiber thickness of the intermediate fiber layer is 0.6-2D, high molecular water-absorbing particles are embedded in the upper fiber layer and the lower fiber layer, the average pore of the upper fiber layer and the lower fiber layer is larger than the average diameter of the high molecular water-absorbing particles, and the average pore of the intermediate fiber layer is smaller than the average diameter of the high molecular water-absorbing particles. The existing technology usually uses fluffy cotton as the intermediate material layer, which has more and larger pores to form a stable space for water-absorbing particles, thereby realizing the setting of two or more water-absorbing layers.

[0003] However, due to the different water-absorbing performance of the multi-layered absorption body, it is easy to cause uneven absorption performance of the absorption body, and further cause distortion or low utilization rate of the absorption body. SUMMARY

[0004] Therefore, in view of the above problems, the present application provides a strong absorption core, which solves the technical problems of distortion or low utilization rate of the existing multi-layered absorption body caused by uneven absorption performance.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: a strong absorption core includes a body, the body includes a first non-woven fabric, a second non-woven fabric, and fluffy cotton clamped between the first non-woven fabric and the second non-woven fabric, an upper water-absorbing particle layer is arranged on one side of the fluffy cotton close to the first non-woven fabric, a lower water-absorbing particle layer is arranged on one side of the fluffy cotton close to the second non-woven fabric, and a through or non-through slot hole is arranged on the fluffy cotton, the area of the slot hole is 10% to 15% of the area of the body, the size of the unit area is defined as 1-5 square centimeters, the water-absorbing performance of the unit area of the upper water-absorbing particle layer is defined as A1, the water-absorbing performance of the unit area of the lower water-absorbing particle layer is defined as A2, and A1:A2 is (7-9):10.

[0006] Further, the slot holes include one or more strip-shaped holes arranged along the length direction of the body and two or more flow-limiting holes arranged at the two ends of the length direction of the body.

[0007] Further, the strip-shaped holes are through slot holes, and one strip-shaped hole is arranged at the middle part of the body.

[0008] Further, at least 90% of the water-absorbing particles in the upper water-absorbing particle layer are completely embedded into the fluffy cotton.

[0009] Further, at least 70% of the water-absorbing particles in the lower water-absorbing particle layer are completely embedded into the fluffy cotton.

[0010] Further, the fluffy cotton includes a fluffy upper layer and a fluffy lower layer arranged uniformly, the upper water-absorbing particle layer is arranged on the fluffy upper layer, and the lower water-absorbing particle layer is arranged on the fluffy lower layer.

[0011] Further, when the water absorption performance is measured, 0.9% of normal saline is poured, and after complete absorption, a certain period of time is waited, then the fluffy upper layer and the fluffy lower layer are separated, and more than three unit area samples are taken respectively and weighed, and the average value is taken, the ratio between the average value of the unit area weight of the fluffy upper layer after water absorption and the average value of the unit area weight of the fluffy lower layer after water absorption is A1:A2.

[0012] Further, the light transmittance of the body is 30% to 75%, the definition of the light transmittance is that, in a closed environment and without water absorption of the body, after the slot holes are shielded, light is irradiated on one side of the body to make the light penetrate the body, and the intensity of the light is detected by a detector on both sides of the body, and the ratio between the intensity of the light penetrating the body and the intensity of the light not penetrating the body is the light transmittance.

[0013] Further, the uniform distribution rate of the body is 5% to 20%, the definition of the uniform distribution rate is that, in a closed environment and with complete water absorption of the body, after the slot holes are shielded, light is irradiated on one side of the body to make the light penetrate the body, and the intensity of the light is detected by a detector on both sides of the body, and the ratio between the intensity of the light penetrating the body and the intensity of the light not penetrating the body is the uniform distribution rate.

[0014] Further, a projection plate is arranged on one side of the body, the total area of the bright spots formed by the light penetrating the body on the projection plate is S1, the projection area of the body on the projection plate is S2, and the ratio of S1:S2 is less than 1:20.

[0015] By adopting the foregoing technical solutions, the application has the following beneficial effects:

[0016] 1. In this design, the area of ​​the perforations is limited to 10% to 15% of the body area. Two absorbent layers are incorporated—an upper absorbent granule layer and a lower absorbent granule layer. Therefore, the perforation design has certain requirements. If the perforations penetrate the fluffy cotton, and the perforation area is large enough, liquid can easily pass through quickly without being absorbed by the upper and lower absorbent granule layers. If the perforations do not penetrate the fluffy cotton, liquid is easily absorbed quickly by the lower absorbent granule layer, resulting in less absorption by the upper absorbent granule layer, causing deformation of the absorbent body and discomfort. To achieve a more balanced effect, limiting the perforation area to 10% to 15% of the body area is optimal, and even better, it should be 12% to 13%.

[0017] After defining the slot size, the water absorption performance of the absorbent particles also needs to be controlled. In this scheme, the water absorption performance per unit area of ​​the upper absorbent particle layer is defined as A1, and the water absorption performance per unit area of ​​the lower absorbent particle layer is defined as A2, with A1:A2 being (7-9):10. This results in a certain enhancement in the water absorption performance of the lower absorbent particle layer compared to the upper absorbent particle layer. This enhancement is uniform and is limited to a specific unit area. It allows for rapid absorption and diffusion of the liquid in the lower absorbent particle layer during infiltration, while also ensuring that the upper absorbent particle layer also absorbs a certain amount. This results in better control of the deformation of the fluffy cotton after water absorption, preventing excessive twisting and ensuring a better distribution of water absorption, which is beneficial for maximizing the utilization rate of the body's water absorption performance.

[0018] 2. The function of the flow-limiting orifice is to restrict side leakage. It can limit the obstruction of liquid diffusion inside the fluffy cotton and improve the efficiency of liquid seepage. When liquid cannot be absorbed in time at the strip orifice, it may flow towards both ends along its length. The flow-limiting orifice effectively obstructs this flow and improves absorption performance. If the flow-limiting orifice is connected to the strip orifice to form a longer strip orifice, the effect is weaker. In addition, limiting the strip orifice to a through-hole, with one of the strip orifices located in the middle of the body, is beneficial for liquid diffusion.

[0019] 3. In the upper absorbent particle layer, at least 90% of the absorbent particles by mass are completely embedded within the fluffy cotton. This ensures the stability of the absorbent particle position. Since the absorbent particles are added by spreading, they are usually located on the surface of the fluffy cotton. A vibration device is then used to apply the absorbent particles, causing them to gradually penetrate into the fluffy cotton. However, due to the size of the pores, the size of the absorbent particles, and measures to prevent the absorbent particles from penetrating deeply into the fluffy cotton, some absorbent particles will still remain on the surface. Similarly, the lower absorbent particle layer is designed in the same way, except that at least 70% of the absorbent particles by mass are completely embedded within the fluffy cotton. The difference lies in the type of absorbent material. Since the upper absorbent particle layer is close to the body, the particles need to be embedded as much as possible within the fluffy cotton to ensure both comfort and absorbency. The lower absorbent particles, however, are further away from the body. As long as the particles not embedded in the fluffy cotton don't cause significant problems, that's sufficient. A small portion of these particles are located outside the fluffy cotton, specifically between the fluffy cotton and the second non-woven fabric. These particles are also secured with adhesive, reducing the deformation of the fluffy cotton after absorbing water and expanding. This, combined with the absorbency per unit area, minimizes the distortion and deformation of the material itself.

[0020] 4. When testing water absorption performance, pour in 0.9% physiological saline solution and wait for complete absorption. Let it stand for a certain period, then separate the fluffy upper layer from the fluffy lower layer. Take at least three unit area samples from each layer, weigh them separately, and take the average value. The three or more unit area samples should be of the same size and preferably from different locations, such as the ends and middle of the length. The standing time is usually 10-20 minutes. It is best to place them on a filter screen to reduce surface moisture, with the fluffy upper layer on top and the fluffy lower layer on the bottom.

[0021] 5. The limitation of light transmittance mainly restricts the distribution of absorbent particles. This is determined by comparing the intensity of light before and after transmission, thereby achieving a better distribution of absorbent particles. In this design, this also applies to the distribution of the upper and lower absorbent particle layers, ensuring uniformity and consistency. This results in better deformation stability and consistency of the body after liquid absorption, leading to a better wearing experience.

[0022] 6. The limitation on uniformity is related to the limitation on transmittance. The limitation on uniformity can effectively assist in improving transmittance, mainly by limiting the amount of water absorbed and the resulting blockage, thus achieving better water absorption performance. Of course, some areas may have special distribution of water-absorbing particles. For example, in certain areas, the distribution of water-absorbing particles may be relatively sparse, but these areas do not have slots. This will create light spots during measurement. The maximum allowable total area of ​​light spots is 1 / 20 of the body area. Attached Figure Description

[0023] Figure 1 is a structural schematic diagram of a double-layer absorbent body forming device;

[0024] Figure 2 is Figure 1 is a structural schematic diagram of an adsorption wheel;

[0025] Figure 3 is a structural schematic diagram of the present application;

[0026] Figure 4 is a sectional structural schematic diagram of the present application.

[0027] Reference signs:

[0028] 11, first forming die wheel; 12, first spreading device; 13, first glue spraying device; 21, second forming die wheel; 22, second spreading device; 23, second glue spraying device; 3, winding device; 4, fluffy cotton input mechanism; 5, first non-woven fabric input mechanism; 6, second non-woven fabric input mechanism; 7, separating mechanism; 8, adsorption wheel; 91, first non-woven fabric; 92, second non-woven fabric; 93, fluffy cotton; 931, fluffy upper layer; 932, fluffy lower layer; 94, primary composite fabric; 951, upper water-absorbing particle layer; 952, lower water-absorbing particle layer; 96, strip-shaped hole; 97, flow-limiting hole. DETAILED DESCRIPTION

[0029] The present application will be further described in conjunction with the drawings and specific embodiments.

[0030] Reference Figure 3 , Figure 4 , the embodiment provides a strong absorbent core body, comprising a body, the body comprising a first non-woven fabric 91, a second non-woven fabric 92 and a fluffy cotton 93 clamped between the first non-woven fabric 91 and the second non-woven fabric 92, an upper water-absorbing particle layer 951 is arranged on one side of the fluffy cotton 93 close to the first non-woven fabric 91, a lower water-absorbing particle layer 952 is arranged on one side of the fluffy cotton 93 close to the second non-woven fabric 92, the fluffy cotton 93 is provided with a through or non-through slot hole, the area of the slot hole is 10% to 15% of the area of the body, the size of the defined unit area is 1 to 5 square centimeters, preferably, the size of the defined unit area is 2 square centimeters. On the part of the body not containing the slot hole, the water absorption performance of the unit area of the upper water-absorbing particle layer 951 is defined as A1, the water absorption performance of the unit area of the lower water-absorbing particle layer 952 is defined as A2, A1:A2 is (7-9):10, preferably A1:A2 is 8:10.

[0031] The slot holes include one or more strip-shaped holes 96 arranged along the length direction of the body and two or more flow-limiting holes 97 arranged at both ends of the length direction of the body. The strip-shaped hole 96 is a through slot hole, and one strip-shaped hole 96 is located at the middle of the body.

[0032] When designing and manufacturing the absorbent body, the area ratio of the slot holes is carefully considered and limited. As a key part of the absorbent body structure, the size of the slot hole directly affects the liquid absorption efficiency and the overall performance of the absorbent body. In order to ensure that the liquid can be uniformly absorbed by the upper and lower water-absorbing particle layers, and to avoid rapid passage or local uneven absorption of the liquid, we limit the area of the slot hole to 10% to 15% of the area of the body.

[0033] In specific operation, we first determine the shape and distribution of the slot hole to ensure that its area ratio is within the specified range. This step is crucial because the size of the slot hole directly relates to the flow path and absorption speed of the liquid. If the area ratio of the slot hole is too large, the liquid will easily pass through the fluffy cotton layer quickly, and the upper and lower water-absorbing particle layers will not be fully absorbed. Conversely, if the slot hole area is too small, it may limit the flow of liquid and affect the absorption efficiency.

[0034] In order to achieve more balanced absorption effect, we further optimize the area ratio of the slot hole. Through experimental verification, we found that when the area ratio of the slot hole is controlled between 12% and 13%, the absorbent body can achieve better performance. This setting not only ensures that the liquid can smoothly pass through the slot hole and be uniformly absorbed by the upper and lower water-absorbing particle layers, but also avoids the problems of uneven absorption or liquid leakage caused by too large or too small slot hole area.

[0035] In addition, we also pay special attention to whether the slot hole penetrates the fluffy cotton and its impact on the absorption effect. If the slot hole penetrates the fluffy cotton, a large slot hole area will cause the liquid to pass quickly without being fully absorbed; if the slot hole does not penetrate the fluffy cotton, the liquid may be too quickly absorbed by the lower water-absorbing particle layer, resulting in insufficient absorption of the upper water-absorbing particle layer, and thus affecting the overall shape of the absorbent body and the wearing comfort.

[0036] Therefore, by precisely controlling the area ratio of the slot hole between 10% and 15%, and further optimizing it to 12% to 13%, we can achieve a more balanced absorption effect. Such design not only improves the overall performance of the absorbent body, but also effectively avoids the problems of liquid leakage and uneven absorption, thereby ensuring the wearing comfort and use effect.

[0037] At least 90% of the water-absorbing particles in the upper water-absorbing particle layer 951 are completely embedded in the fluffy cotton 93. At least 70% of the water-absorbing particles in the lower water-absorbing particle layer 952 are completely embedded in the fluffy cotton 93.

[0038] The fluffy cotton 93 includes a fluffy upper layer 931 and a fluffy lower layer 932 arranged uniformly, the upper water-absorbing particle layer 951 is located on the fluffy upper layer 931, and the lower water-absorbing particle layer 952 is located on the fluffy lower layer 932.

[0039] When the water absorption performance is measured, 0.9% of normal saline is poured, after waiting for complete absorption, standing for a certain period of time, then separating the fluffy upper layer 931 and the fluffy lower layer 932, and taking more than three unit area samples respectively, and taking the average value, the ratio between the average value of the unit area weight of the fluffy upper layer 931 after water absorption and the average value of the unit area weight of the fluffy lower layer 932 after water absorption is A1:A2. The index of complete absorption can be that the absorption area of the body no longer expands, and the standing time is usually 10-20 minutes, and the preferred way is to place it on a filter screen to reduce surface-attached water, and the fluffy upper layer is on the top and the fluffy lower layer is on the bottom. Of course, the determination of complete absorption can also be in other ways. The standing time can also be set according to actual needs, and the standing method can also be adjusted according to actual needs.

[0040] When performing water absorption performance measurement, we use a standardized method to ensure the accuracy and reliability of the results. First, we pour 0.9% of normal saline, which is to simulate the liquid environment in the human body, so that the test results are more practical. After pouring normal saline, we wait for the body to completely absorb, which is crucial because it ensures that we get the true water absorption capacity of the body.

[0041] To determine whether the absorption is complete, we observe whether the absorption area of the body continues to expand. Once the body stops absorbing, it is considered to have reached saturation. At this time, we let the body stand for a period of time, usually 10-20 minutes, to allow the absorbed water to distribute more evenly within the body. To obtain better test results, we recommend placing the body on a filter screen for standing, which can effectively reduce the surface-attached water, making the measurement results more accurate. At the same time, during the standing process, we ensure that the fluffy upper layer 931 is located on the top and the fluffy lower layer 932 is located on the bottom to maintain the natural state of the body.

[0042] After standing is completed, we proceed to the next step: separating the fluffy upper layer 931 and the fluffy lower layer 932. To ensure the representativeness of the results, we take more than three unit area samples from each layer for weighing and calculate their average value. In this way, we can obtain the average unit area weight of the fluffy upper layer 931 and the fluffy lower layer 932 after water absorption, and then determine the ratio A1:A2 between them. This ratio is of great significance for us to evaluate the water absorption performance of the body and the water distribution between the layers.

[0043] In addition, we emphasize that the determination of "complete absorption" is not limited to observing whether the absorption area expands. In actual operation, we can also determine whether the body has reached the saturated state of absorption according to other indicators or methods. Similarly, although the standing time is usually set to 10-20 minutes, it can also be adjusted flexibly according to actual needs. The standing method is not fixed and can be chosen according to the actual situation.

[0044] Through such standardized operation steps and flexible standing time and method, we can more comprehensively and accurately evaluate the water absorption performance of the body.

[0045] The light transmittance of the body is 30% to 75%, and the definition of light transmittance is measured in a strictly controlled closed environment. In this environment, the body is in a completely non-water-absorbed state to ensure the accuracy of the measurement results. During the measurement process, all the slots are first shielded to avoid external light interference. Then, a light source is shone on one side of the body, allowing the light to try to penetrate the body. In order to quantify the degree of penetration of light, detectors are placed on both sides of the body to detect the intensity of light before and after penetration. Finally, the calculation method of light transmittance is to compare the ratio between the light intensity that has penetrated the body and the initial light intensity that has not penetrated the body. This ratio, i.e. light transmittance, is a key indicator to measure the light transmittance performance of the body material.

[0046] Firstly, the setting of a closed environment can minimize the influence of external environment on the measurement results. Since external light, temperature and humidity and other environmental factors can interfere with the measurement of light transmittance, measuring in a closed environment can ensure the accuracy and reliability of the measurement results. Secondly, the non-water-absorbed state of the body is also a key factor to ensure the accuracy of the measurement results. The optical properties of the material may change after water absorption, which can affect the measurement results of light transmittance. Therefore, measuring in a non-water-absorbed state can exclude the influence of water on the performance of the material and more truly reflect the light transmittance performance of the material.

[0047] The uniformity of the body is 5% to 20%, and the definition of uniformity is that in a closed environment and under the condition that the body is completely absorbed, after the slots are shielded, light is shone on one side of the body to penetrate the body, and the intensity of light is detected on both sides of the body using detectors. The ratio between the intensity of light that has penetrated the body and the intensity of light that has not penetrated the body is the uniformity. A projection plate is set on one side of the body, the total area of bright spots formed by light that has penetrated the body on the projection plate is S1, and the projection area of the body on the projection plate is S2. The ratio of S1:S2 is less than 1:20.

[0048] The uniformity of the body is designed in the range of 5% to 20%, which is carefully calculated. The uniformity, as a key parameter, is defined as follows: in a completely closed environment, when the body is fully water-absorbed, we shield all the slot holes. Then, we use a light source to irradiate from one side of the body, so that the light can penetrate the body. In order to accurately measure the light penetration, we set high-sensitivity light detectors on both sides of the body to detect the intensity of the light.

[0049] The uniformity here refers to the ratio between the intensity of the light that has penetrated the body and the original light intensity that has not penetrated the body. This ratio can intuitively reflect the light transmission performance of the body material, and then represent the uniformity of the internal structure, and then represent the distribution of the polymer particles. By accurately controlling this ratio between 5% and 20%, we can ensure that the body maintains good water-absorbing properties while also having sufficient structural strength and stability.

[0050] In order to more intuitively observe and evaluate the light penetration, we set a high-precision projection plate on one side of the body. When the light penetrates the body, it will form a series of bright spots on the projection plate. The total area of these bright spots is recorded as S1, and the complete projection area of the body on the projection plate is recorded as S2. By calculating the ratio of S1 to S2, we can further understand the distribution of light in the body. In particular, when the ratio of S1 to S2 is less than 1:20, it means that the light distribution through the body is relatively uniform, without large-area bright spots, which also verifies the rationality of the body uniformity design from the side.

[0051] The beneficial effects of the present application are:

[0052] 1、In the present scheme, the area of the slot hole is limited to 10% to 15% of the area of the body. After setting the upper and lower water-absorbing particle layers, the slot hole has certain requirements. If the slot hole is a through-porous cotton, if the slot hole area is too large, the liquid will quickly pass through and not be absorbed by the upper and lower water-absorbing particle layers. If the slot hole is not a through-porous cotton, the liquid will be quickly absorbed by the lower water-absorbing particle layer, resulting in less absorption of the upper water-absorbing particle layer, and causing the absorption body to deform, leading to discomfort. In order to achieve a more balanced effect, limiting the area of the slot hole to 10% to 15% of the area of the body is preferable, and more preferably, it should be 12% to 13%.

[0053] After the slot holes are defined, the water absorption performance of the water absorption particles also needs to be controlled. In the present scheme, the water absorption performance per unit area of the upper water absorption particle layer is defined as A1, and the water absorption performance per unit area of the lower water absorption particle layer is defined as A2, A1:A2 is (7-9):10, so that the water absorption performance of the lower water absorption particle layer is enhanced compared with the upper water absorption particle layer. This enhancement is uniform and is under the limitation of unit area. It can make the liquid in the process of downward infiltration not only realize the rapid absorption and diffusion of the lower water absorption particle layer, but also ensure that the upper water absorption particle layer also has a certain absorption. Thus, the deformation of the water-absorbed fluffy cotton is well controlled, and large distortion is not caused. It also has good water absorption distribution, which is beneficial to the large utilization rate of the body water absorption performance.

[0054] 2. The function of the flow limiting hole is to limit side leakage, which can not only limit the blockage of liquid diffusion in the fluffy cotton, but also improve the efficiency of liquid infiltration. When the liquid cannot be absorbed at the slot hole, it may flow to both ends of the length direction. The flow limiting hole can effectively block the flow and improve the absorption performance. If the flow limiting hole is connected with the slot hole to form a longer slot hole, the effect is weak. In addition, the slot hole is a through slot hole, and one of the slot holes is located at the middle of the body, which is beneficial to the diffusion of the liquid.

[0055] 3. At least 90% of the mass of the water absorption particles in the upper water absorption particle layer is completely embedded into the fluffy cotton. This can realize the stable position of the water absorption particles. Since the water absorption particles are added in the form of scattering, they are usually located on the surface of the fluffy cotton, and then the oscillation device is used for oscillation to gradually make the water absorption particles enter the fluffy cotton. However, due to the size of the pores, the size of the water absorption particles, and the prevention of the water absorption particles from penetrating into the fluffy cotton, part of the water absorption particles will still remain on the surface. Similarly, the lower water absorption particle layer is also arranged in this way, but at least 70% of the mass of the water absorption particles is completely embedded into the fluffy cotton. The difference between the two is that the upper water absorption particle layer is close to the human body, so it is necessary to embed the water absorption particles into the fluffy cotton as much as possible to ensure comfort and water absorption. The lower water absorption particle layer is away from the human body, and as long as the water absorption particles that are not in the fluffy cotton do not cause too much influence, a small part of the water absorption particles located outside the fluffy cotton, that is, between the fluffy cotton and the second non-woven fabric, will be fixed by the glue and can reduce the deformation of the fluffy cotton after water absorption and expansion. Thus, the water absorption performance per unit area is matched to reduce the distortion of the body.

[0056] 4、In the water absorption performance measurement, pour in 0.9% of normal saline, wait for complete absorption, and then separate the fluffy upper layer and the fluffy lower layer, and take more than three unit area samples respectively, and take the average value, and the three or more unit area samples in the sampling should be consistent in size, and preferably in different parts, such as the two ends and the middle region in the length direction. The standing time is usually 10-20 minutes, and the preferred way is to put it on the filter screen to reduce the surface attached water, and the fluffy upper layer is on the top and the fluffy lower layer is on the bottom.

[0057] 5、The definition of light transmittance is mainly to limit the distribution of water absorption particles, which is defined by comparing the intensity of light before and after transmission, so as to obtain a better distribution of water absorption particles, that is, the distribution of upper and lower water absorption particle layers in this scheme, so as to meet the uniformity and consistency of the distribution. Thus, the body has good deformation stability and consistency after liquid absorption, so as to obtain a better wearing experience.

[0058] 6、The definition of uniformity is related to the definition of light transmittance, and the definition of uniformity can effectively assist the light transmittance, which mainly limits the shielding after water absorption, so as to obtain a better water absorption performance. Of course, there will be some areas of water absorption particles with special scattering, such as in a specific area, the scattering of water absorption particles is relatively sparse, but this part does not set the slot hole, so that when measuring, a light spot will be formed, and the total area of the allowed light spot is 1 / 20 of the area of the body.

[0059] For the distribution of upper and lower water absorption particles, a double-layer absorbent forming device is used to realize forming, referring to Figure 1 、 Figure 2 A strong absorbent core forming device, comprising a first forming device, a second forming device and a winding device 3 for double-layer absorbent arranged in a flow line, one side of the first forming device is provided with a fluffy cotton input mechanism 4 for fluffy cotton 93 conveying, a first non-woven fabric input mechanism 5 for conveying the first non-woven fabric 91, a second non-woven fabric input mechanism 6 for conveying the second non-woven fabric 92;

[0060] The first forming device comprises a first forming die 11 and a first scattering device 12 for scattering high molecules;

[0061] The second forming device comprises a second forming die 21 and a second scattering device 22 for scattering second high molecules;

[0062] The first non-woven fabric input mechanism 5 is used to input the first non-woven fabric 91 to the surface of the first forming wheel 11, the fluffy cotton input mechanism 4 is used to input the fluffy cotton 93 to the first forming wheel 11, and cover the outer surface of the first non-woven fabric, the second non-woven fabric input mechanism 6 is used to input the second non-woven fabric 92 to the surface of the first forming wheel 11, and cover the outer surface of the fluffy cotton 93, the first spreading device 12 is located above the first forming wheel 11 and between the input end of the fluffy cotton 93 and the input end of the second non-woven fabric 92, and is used to spread the polymer on the outer surface of the fluffy cotton 93;

[0063] The first forming wheel 11 and the second forming wheel 21 are provided with a separation mechanism 7 for separating the first non-woven fabric 91 from the fluffy cotton 93, and the separation mechanism 7 separates the first non-woven fabric 91 and the primary composite fabric 94;

[0064] The second forming wheel 21 is used to receive the primary composite fabric 94 output by the first forming wheel 11, and the second non-woven fabric 92 in the primary composite fabric 94 is attached to the outer surface of the second forming wheel 21, and the fluffy cotton 93 is located on the outer surface of the second non-woven fabric 92.

[0065] The first non-woven fabric separated by the separation mechanism 7 is input to the second forming wheel 21 after winding, and covers the outer surface of the primary composite fabric 94, and the second spreading device 22 is located above the second forming wheel 21 and between the input end of the primary composite fabric 94 and the input end of the separated first non-woven fabric. The separation mechanism 7 can be a structure for winding composed of multiple guide rollers.

[0066] The first glue spraying device 13 is provided between the second non-woven fabric input mechanism 6 and the first forming wheel 11, and is used to spray glue on the input second non-woven fabric 92. The second glue spraying device 23 is provided between the input end of the separation mechanism 7 and the second forming wheel 21, and is used to spray glue on the separated first non-woven fabric 91. The first glue spraying device 13 and the second glue spraying device 23 are both conventional glue spraying equipment in the art, which can be purchased from the market.

[0067] The fluffy cotton input mechanism 4, the first non-woven fabric input mechanism 5, the second non-woven fabric input mechanism 6 and the winding device 3 all include one or more of unwinding mechanism, deviation correction mechanism, buffer mechanism, tensioning mechanism, conveying mechanism and guiding mechanism. The above-mentioned unwinding mechanism, deviation correction mechanism, buffer mechanism, tensioning mechanism, conveying mechanism and guiding mechanism are conventional technical means in the art, and can be related to the applicant's patents, such as the unwinding mechanism disclosed in Chinese patent application No. CN201510264615.X, a wire unwinding device, such as the deviation correction structure disclosed in Chinese patent application No. CN201621469755.7, a paper web deviation correction mechanism, such as the buffer mechanism and the tensioning mechanism disclosed in Chinese patent application No. CN201420387213.X, a material tension control device, such as the conveying mechanism and the guiding mechanism disclosed in Chinese patent application No. CN202011605786.1, a material unwinding control method, etc. The above-mentioned mechanisms can be increased or decreased according to the needs, and other conventional devices can also be added. Similarly, the separation mechanism 7 can also be composed of one or more of the unwinding mechanism, deviation correction mechanism, buffer mechanism, tensioning mechanism, conveying mechanism and guiding mechanism.

[0068] The first forming die wheel 11 and the second forming die wheel 21 are both negative pressure adsorption die wheels.

[0069] The above-mentioned fluffy cotton 93, also known as fluffy non-woven fabric, can also be other materials as long as it can realize the support of the scattering of double-sided high molecules. The above-mentioned winding device 3 is a conventional technical means in the art, and can also refer to the applicant's related patents, such as Chinese patent application No. CN202222975300.4, a coreless rod winding equipment.

[0070] Reference is also made to Figure 2 The difference between Figure 1 lies in that the first forming die wheel 11 and the second forming die wheel 21 are provided with an adsorption wheel 8 for removing dust generated by the first forming die wheel 11 and the second forming die wheel 21. In fact, the adsorption wheel 8 can also be replaced by other structural forms, such as an adsorption conveyor belt, etc. Moreover, it can also be replaced by other functional components, such as a vibration mechanism, etc.

[0071] In practical applications, the first oscillating mechanism and the second oscillating mechanism can be arranged to oscillate the primary composite cloth and the complete composite, so that the distribution of the polymer in the fluffy cotton is more stable and uniform. When oscillating, there are two options. One is to make the polymer gather in the middle of the fluffy cotton. This way can make the position of the polymer in the fluffy cotton stable, prevent the polymer from clumping, and the uniformity of the water absorption effect is better. The other is to make the polymer uniformly distributed on the surface of the fluffy cotton. In this way, the pores of the fluffy cotton are used to position the polymer particles, so that the arrangement of the polymer particles is better, and when absorbing water, both the upper and lower surfaces of the fluffy cotton can absorb water, and the middle of the fluffy cotton serves as a water passage, so that the purpose of rapid water absorption can be achieved. The first oscillating mechanism and the second oscillating mechanism are conventional technical means in the art, which can be obtained by market procurement, and therefore will not be described here. There is no related indication in the figure. That is, by using the first oscillating mechanism and the second oscillating mechanism, at least 90% of the water absorption particles in the upper water absorption particle layer 951 can be completely embedded in the fluffy cotton 93. At least 70% of the water absorption particles in the lower water absorption particle layer 952 can be completely embedded in the fluffy cotton 93.

[0072] A method for forming a strong absorbent core, comprising the following steps:

[0073] In the first step, the first non-woven fabric 91 is input into the first forming mold wheel 11 by using the first non-woven fabric input mechanism 5, the fluffy cotton 93 is input into the first forming mold wheel 11 by using the fluffy cotton input mechanism 4, and the fluffy cotton 93 covers the outer surface of the first non-woven fabric 91. Then, the polymer is scattered on the outer surface of the fluffy cotton 93 by using the first spreading device 12.

[0074] In the second step, the second non-woven fabric 92 is input into the first forming mold wheel 11 by using the second non-woven fabric input mechanism 6, and the second non-woven fabric 92 covers the outer surface of the fluffy cotton 93, so as to cover the fluffy cotton 93 after the polymer is scattered.

[0075] In the third step, the primary composite of the first non-woven fabric 91, the fluffy cotton 93 and the second non-woven fabric 92 is output, and the first non-woven fabric 91 in the primary composite is separated by using the separation mechanism 7, so as to form the primary composite cloth 94.

[0076] In the fourth step, the primary composite cloth 94 is input into the second forming mold wheel 21, so that the second non-woven fabric 92 is attached to the outer surface of the second forming mold wheel 21, and the fluffy cotton 93 covers the outer surface of the second non-woven fabric 92. Then, the polymer is scattered on the outer surface of the fluffy cotton 92 by using the second spreading device 22.

[0077] In the fifth step, the separated first non-woven fabric 91 is covered on the outer surface of the fluffy cotton 93 on the second forming mold wheel 21.

[0078] The sixth step is to output the complete composite of the first non-woven fabric 91, the fluffy cotton 93 and the second non-woven fabric 92, and to roll it up by using the rolling device 3.

[0079] In the second step, the second non-woven fabric 92 is sprayed with glue by using the second glue spraying device 23 to achieve adhesion with the fluffy cotton 93.

[0080] In the fifth step, the first non-woven fabric 91 is sprayed with glue by using the first glue spraying device 13 to achieve adhesion with the fluffy cotton 93.

[0081] In the third step, the dust generated by the first forming die wheel 11 and the second forming die wheel 21 is removed by using the adsorption wheel 8 arranged between the first forming die wheel 11 and the second forming die wheel 21.

[0082] In the third step, the once-composite fabric 94 is oscillated by using the oscillation mechanism arranged between the first forming die wheel 11 and the second forming die wheel 21 to achieve reasonable distribution of the polymer on the fluffy cotton 93.

[0083] In the sixth step, the complete composite is oscillated by using the second oscillation mechanism arranged outside the second forming die wheel 21 to achieve reasonable distribution of the polymer on the fluffy cotton 93.

[0084] The two surfaces of the fluffy cotton, which are actually opposite to each other, are turned over after the fluffy cotton is wound around the first forming die wheel and the second forming die wheel, and the polymer is spread on different surfaces of the fluffy cotton, thereby achieving a high work efficiency.

[0085] Although the present application is specifically shown and described in connection with the preferred embodiments, those skilled in the art will appreciate that various modifications in form and detail can be made without departing from the spirit and scope of the application as defined by the appended claims.

Claims

1. A strong absorbent core, comprising a body, the body comprising a first nonwoven fabric, a second nonwoven fabric and a fluffy cotton interposed between the first nonwoven fabric and the second nonwoven fabric, an upper water-absorbing particle layer being provided on a side of the fluffy cotton close to the first nonwoven fabric, and a lower water-absorbing particle layer being provided on a side of the fluffy cotton close to the second nonwoven fabric, characterized in that: the fluffy cotton is provided with through or non-through grooves, the light transmittance of the body is 30% to 75%, and the uniformity of the body is 5% to 20%. The uniformity is defined as, under a closed environment and in the case that the body is completely water-absorbed, after the grooves are shielded, light is irradiated on one side of the body to make the light penetrate the body, and the intensity of the light is detected by a detector on both sides of the body, and the ratio between the intensity of the light penetrating the body and the intensity of the light not penetrating the body is the uniformity. The light transmittance of the body is 30% to 75%, and the light transmittance is defined as, under a closed environment and in the case that the body is not water-absorbed, after the grooves are shielded, light is irradiated on one side of the body to make the light penetrate the body, and the intensity of the light is detected by a detector on both sides of the body, and the ratio between the intensity of the light penetrating the body and the intensity of the light not penetrating the body is the light transmittance. The area of the grooves is 10% to 15% of the area of the body, and the grooves comprise one or more strip-shaped holes arranged along the length direction of the body and two or more flow-limiting holes arranged at both ends of the length direction of the body.

2. The highly absorbent core according to claim 1, characterized in that: The strip-shaped holes are through grooves, and one strip-shaped hole is located at the middle of the body.

3. An absorbent core according to claim 2, characterized in that: At least 90% of the water-absorbing particles in the upper water-absorbing particle layer are completely embedded in the fluffy cotton.

4. The highly absorbent core according to claim 1, characterized in that: At least 70% of the water-absorbing particles in the lower water-absorbing particle layer are completely embedded in the fluffy cotton.

5. The superabsorbent core according to claim 1, characterized by: The fluffy cotton comprises a fluffy upper layer and a fluffy lower layer arranged uniformly, the upper water-absorbing particle layer is arranged on the fluffy upper layer, and the lower water-absorbing particle layer is arranged on the fluffy lower layer.

6. The superabsorbent core according to claim 1, characterized by: A projection plate is arranged on one side of the body, the total area of the bright spots formed by the light penetrating the body on the projection plate is S1, the projection area of the body on the projection plate is S2, and the ratio of S1 to S2 is less than 1:

20.

7. The superabsorbent core according to claim 1, characterized by: ​

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