Gluing compound equipment for preparing medical nursing pad and use method

Abstract

The invention discloses gluing composite equipment for preparing a medical nursing pad and a using method, and relates to the technical field of layered products, the gluing composite equipment comprises an equipment rack, a top layer conveying mechanism, a core layer conveying mechanism and a bottom layer conveying mechanism, and the top layer conveying mechanism, the core layer conveying mechanism and the bottom layer conveying mechanism are sequentially installed on the inner side of the equipment rack from top to bottom; the first compounding mechanism is mounted on the inner side, close to one end, of the equipment rack; two groups of gluing mechanisms are arranged between the first compounding mechanism and the core layer conveying mechanism; by improving the humidity of the core layer base material, the formed liquid bridge network and the humidity gradient, the bonding force between fibers is enhanced, the brittleness of the fibers is reduced, the permeation of glue in the deep layers of the fibers is optimized, the interface bonding force is improved, the bonding strength of the glued nursing pad is enhanced, the electrostatic adsorption effect is eliminated, SAP particles are uniformly embedded into the fiber network, and the adhesion of the SAP particles is improved. Agglomeration and cavities are avoided, the whole process is high in automation degree, and the production efficiency is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of layered products, in particular to the use of adhesives, and specifically to a gluing composite device for preparing a medical nursing pad and a use method thereof. Background Art

[0002] As an important sanitary product, nursing pads are widely used in hospitals, nursing homes, homes and other occasions to absorb and manage body fluids, such as urine and sweat, to keep patients clean and comfortable. The structure of traditional nursing pads is mainly composed of a bottom polyethylene (PE) film, a top non-woven fabric and a composite core layer between the two. The composite core layer is usually a mixture of fluff pulp and a polymer absorbent resin (SAP). The fluff pulp provides a good fiber network structure that helps the rapid absorption and diffusion of liquids, while SAP ensures the efficient liquid absorption performance of the nursing pad with its excellent water absorption and water locking capabilities.

[0003] In the preparation process of traditional nursing pads, SAP particles need to be evenly spread on the surface of fluff pulp, and then the two are tightly combined through compression to form a composite core layer. Next, glue is applied to the inside of the PE film and non-woven fabric, and then they are bonded to the composite core layer to finally form the overall structure of the nursing pad, that is, the PE film is the bottom layer, the composite core layer is in the middle, and the non-woven fabric is covered on the top. The characteristics of each layer of material are fully utilized to achieve rapid absorption, diffusion and locking of liquids, while keeping the pad surface dry and comfortable.

[0004] Traditional preparation processes often rely on manual operation or simple mechanized equipment in the steps of SAP spreading and bonding, which not only leads to low production efficiency, but also makes it difficult to ensure the consistency and stability of the product. Especially on high-speed production lines, how to ensure the uniform distribution of SAP particles and the firmness of glue bonding has become a key factor restricting production efficiency and product quality. Summary of the invention

[0005] The present invention overcomes the deficiencies of the prior art and provides a gluing and compounding device for preparing a medical nursing pad and a use method thereof.

[0006] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a gluing and laminating device for preparing a medical nursing pad, comprising: an equipment frame, a top layer conveying mechanism, a core layer conveying mechanism and a bottom layer conveying mechanism sequentially installed on the inner side of the equipment frame from top to bottom, and a first laminating mechanism installed on the inner side of the equipment frame near one end for laminating the top layer, the core layer and the bottom layer substrate into a sandwich structure; Two groups of gluing mechanisms are arranged between the first compounding mechanism and the core layer conveying mechanism for spraying adhesive respectively on the top layer and bottom layer substrates facing the core layer substrate; two groups of humidity spraying mechanisms, a SAP spraying mechanism and a second compounding mechanism are arranged in sequence in the direction of the core layer conveying mechanism toward the first compounding mechanism; The two groups of humidity spraying mechanisms are symmetrically arranged at the top and bottom of the core layer substrate in sequence, and are used to pre-increase the humidity and post-increase the humidity of the core layer substrate in sequence; the SAP spraying mechanism is used to spray the embedded polymer water-absorbing resin onto the core layer substrate; the second composite mechanism is used to composite the polymer water-absorbing resin and the core layer substrate into a core layer.

[0007] In a preferred embodiment of the present invention, the humidity spraying mechanism includes: a plurality of mounting plates fixed to the inner side of the equipment frame, a connecting plate arranged on one side of the plurality of mounting plates, and a plurality of spraying heads fixed on the connecting plate; a water delivery head is installed at one end of the spraying head for connecting an external water delivery device to realize water supply; a cylinder is fixed to one side of the mounting plate, and an output end of the cylinder is fixed to one side of the connecting plate.

[0008] In a preferred embodiment of the present invention, the spraying ends of the plurality of spray heads face the surface of the core substrate and are evenly distributed on the connecting plate in a linear array; one side of the connecting plate is slidably connected to one side of the mounting plate.

[0009] In a preferred embodiment of the present invention, the gluing mechanism includes: a melt-glue cylinder fixed on the inner side of the equipment frame, a heating layer arranged inside the melt-glue cylinder, and a plurality of glue spray heads fixed on one side of the melt-glue cylinder; a plurality of glue delivery heads are installed on the other side of the melt-glue cylinder for connecting an external glue delivery device to realize adhesive supply.

[0010] In a preferred embodiment of the present invention, the heating layer realizes the change of the liquid form of the adhesive by means of heat radiation or heat conduction; the spraying ends of several of the spray heads are oriented toward the top layer or the bottom layer material facing the side of the core layer substrate, and are evenly distributed on the melt cylinder in a linear array.

[0011] In a preferred embodiment of the present invention, the SAP spraying mechanism includes: a discharge cone cylinder arranged between the humidity spraying mechanism and the second composite mechanism, and a feeding head installed on one side of the discharge cone cylinder for an external feeding device to realize the supply of high molecular water-absorbing resin; the side surface of the discharge cone cylinder is fixed to the inner side of the equipment frame, and the discharge end faces the top of the core layer substrate.

[0012] The present invention provides a method for using a gluing composite device for preparing a medical nursing pad, comprising the following steps: S1, respectively passing the top layer, core layer and bottom layer substrates through the top layer conveying mechanism, the core layer conveying mechanism and the bottom layer conveying mechanism in sequence, and driving the three to feed toward the first composite mechanism; S2, during the feeding of the core layer substrate, two groups of humidity spraying mechanisms are used to pre-increase the humidity by atomizing spraying once, and then post-increase the humidity by atomizing spraying twice according to the target humidity of the core layer substrate; S3, spraying the embedded polymer water-absorbing resin on the top of the core layer substrate whose humidity increases for a certain interval time through the SAP spraying mechanism, and compounding the polymer water-absorbing resin and the core layer substrate into a core layer through the second compounding mechanism; S4. Use two sets of gluing mechanisms to spray adhesive on the top layer and the bottom layer substrate facing the core layer substrate respectively, and use the first compounding mechanism to compound the top layer, the core layer and the bottom layer substrate into a nursing pad with a sandwich structure.

[0013] In a preferred embodiment of the present invention, in the step S2, the target humidity is 4-10% of the total mass of the core layer substrate.

[0014] In a preferred embodiment of the present invention, in step S2, the spraying direction of the primary atomization spraying is the top of the core layer substrate, and the spraying direction of the secondary atomization spraying is the bottom of the core layer substrate.

[0015] In a preferred embodiment of the present invention, in step S3, the interval time is 6-15 s.

[0016] The present invention solves the defects existing in the background technology and has the following beneficial effects: The present invention provides a gluing composite device for preparing a medical nursing pad and a use method thereof. By increasing the humidity of a core layer substrate, a liquid bridge network and a humidity gradient are formed, which not only enhance the bonding force between fibers and reduce the fiber brittleness, but also optimize the penetration of glue into the deep layer of the fiber, enhance the interfacial bonding force, and enhance the bonding strength of the nursing pad after gluing. At the same time, the electrostatic adsorption effect is eliminated, so that SAP particles are evenly embedded in the fiber network to avoid agglomeration and voids. The entire process has a high degree of automation, and the production efficiency is significantly improved.

[0017] In the present invention, the humidity is pre-increased at the top of the core layer substrate so that water first penetrates through the capillary action of the fiber to form a liquid bridge network, neutralizes the static electricity on the fiber surface, and forms a humidity gradient in which the internal humidity is greater than the surface humidity, thereby avoiding excessive wetting of the surface layer due to one-time spraying and affecting subsequent SAP distribution and glue penetration. On the basis of pre-infiltration, the humidity is post-increased at the bottom of the core layer substrate so that it and the pre-infiltrated liquid bridge network accelerate the diffusion of top moisture, avoid moisture accumulation on the surface, reduce the risk of agglomeration, and simultaneously achieve humidity balance between the inside and the surface of the fiber, thereby ensuring the uniformity of subsequent SAP distribution and glue coating.

[0018] In the present invention, by precisely controlling the interval time from humidity increase to spraying of SAP particles, the moisture after humidity increase can be uniformly infiltrated into the core layer substrate, avoiding excessive concentration of moisture in local areas, reducing agglomeration or uneven dispersion of SAP particles due to uneven water absorption, and hindering glue penetration, and avoiding the influence of too long interval on production line efficiency, thereby ensuring the efficiency of gluing and lamination while balancing moisture diffusion and static elimination. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 It is a three-dimensional structural diagram of a gluing and laminating device according to a preferred embodiment of the present invention; Figure 2 It is the overall half-section structure of the gluing and compounding equipment of the preferred embodiment of the present invention and its partial enlarged view; Figure 3 (a) is a physical picture of the nursing pad prepared in Example 1, and (b) is a physical picture of the nursing pad prepared in Comparative Example 1; In the figure: 1. Equipment frame; 11. Top layer conveying mechanism; 12. Core layer conveying mechanism; 13. Bottom layer conveying mechanism; 2. First composite mechanism; 3. Gluing mechanism; 31. Melting cylinder; 32. Heating layer; 33. Glue spraying head; 4. Humidity spraying mechanism; 41. Mounting plate; 42. Connecting plate; 43. Spraying head; 44. Water delivery head; 45. Cylinder; 5. SAP spraying mechanism; 51. Unloading cone; 52. Delivery head; 6. Second composite mechanism. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0024] Application Overview: As a key hygiene product, the performance and quality of nursing pads are directly related to the patient's experience and health status. Although the preparation process of traditional nursing pads has met the basic needs of the market to a certain extent, it still faces many technical challenges in the actual production process; When preparing the composite core layer of the nursing pad, the fluff pulp is an important fiber material, and its humidity state plays a vital role in the dispersion of SAP (polymer water-absorbing resin), the bonding between fibers, and the subsequent penetration of glue. Traditional preparation processes often ignore the precise control of the humidity of the fluff pulp, resulting in the fluff pulp being too dry. Not only does it make it difficult for SAP particles to be evenly dispersed in the fiber network, affecting the liquid absorption performance of the core layer, but also because the dry fiber surface is prone to accumulate static electricity, it further aggravates the agglomeration of SAP, forming local accumulation or voids, and seriously weakening the overall performance of the nursing pad.

[0025] At the same time, too dry fluff pulp may also lead to a decrease in the adhesive strength of the glue, because dry fibers are difficult to form an effective bond with the glue, increasing the risk of delamination or peeling between the core layer and the PE film / non-woven fabric. This is particularly prominent on high-speed production lines, because the improvement of production efficiency is often accompanied by a decrease in attention to material processing details, which exacerbates the instability of product quality.

[0026] In view of the existence of the above problems, after research and practice, it was found that the humidity control of fluff pulp has an important influence on the preparation process and product quality of nursing pads. In order to solve this technical problem, the present invention proposes an innovative gluing composite equipment and use method for preparing medical nursing pads, which aims to optimize the humidity state of fluff pulp through precise humidity control technology, thereby improving the dispersibility of SAP, enhancing the bonding strength between fibers and improving the penetration effect of glue.

[0027] like Figure 1 and Figure 2 As shown, a gluing and compounding device for preparing a medical nursing pad comprises: an equipment frame 1, a top layer conveying mechanism 11, a core layer conveying mechanism 12 and a bottom layer conveying mechanism 13 which are sequentially installed on the inner side of the equipment frame 1 from top to bottom, and a first compounding mechanism 2 which is installed on the inner side of the equipment frame 1 near one end and is used to compound the top layer, the core layer and the bottom layer substrate into a sandwich structure; two groups of gluing mechanisms 3 for spraying adhesive respectively on the top layer and the bottom layer substrate facing the core layer substrate are arranged between the first compounding mechanism 2 and the core layer conveying mechanism 12; two groups of humidity spraying mechanisms 4, a SAP spraying mechanism 5 and a second compounding mechanism 6 are sequentially arranged in the direction of the core layer conveying mechanism 12 toward the first compounding mechanism 2; the two groups of humidity spraying mechanisms 4 are sequentially symmetrically arranged at the top and bottom of the core layer substrate, and are used to sequentially perform pre-increase and post-increase of humidity on the core layer substrate; the SAP spraying mechanism 5 is used to spray the embedded polymer water-absorbing resin on the core layer substrate; the second compounding mechanism 6 is used to compound the polymer water-absorbing resin and the core layer substrate into a core layer.

[0028] It should be noted that the specific structures of the top layer conveying mechanism 11, the core layer conveying mechanism 12 and the bottom layer conveying mechanism 13 are the same, all of which are multiple groups of conveying rollers rotatably installed on the inner side of the equipment frame 1 in the feeding direction, and each group of conveying rollers includes two conveying rollers rotating in opposite directions up and down, and the feeding operation of the top layer, core layer and bottom layer substrates is realized by cooperating with a power source that can be installed on the inner side of the equipment frame 1 and multiple groups of conveying rollers; the specific structures of the first composite mechanism 2 and the second composite mechanism 6 are the same, all of which include two composite rollers rotatably installed on the inner side of the equipment frame 1 and rotating in opposite directions up and down, and the composite molding of the core layer or the nursing pad is realized by cooperating with a power source that can be installed on the inner side of the equipment frame 1 and several composite rollers; the specific structure of the power source is a mechanical structure that can transmit rotational motion in the prior art, which is common knowledge in the field, so this application no longer explains the control method and structure in detail, and no detailed description is made here.

[0029] Specifically, the equipment frame 1 serves as a supporting base, and the top layer conveying mechanism 11, the core layer conveying mechanism 12 and the bottom layer conveying mechanism 13 are installed in sequence to respectively realize the feeding operations of the top layer, the core layer and the bottom layer substrates. The humidity spraying mechanism 4, the SAP spraying mechanism 5 and the second composite mechanism 6 arranged in sequence on the core layer conveying mechanism 12 are used to respectively perform humidity pretreatment on the core layer substrate and add SAP functional materials, and composite the polymer water-absorbing resin with the core layer substrate to form a core layer. At the same time, two groups of gluing mechanisms 3 are used to spray adhesive on the opposite side of the core layer of the top layer and the bottom layer substrate respectively. The first composite mechanism 2 is responsible for composite the three layers of substrate into a sandwich structure to achieve firm bonding. The entire process has a high degree of automation, which significantly improves production efficiency.

[0030] In some embodiments, the humidity spraying mechanism 4 includes: a plurality of mounting plates 41 fixed to the inner side of the equipment rack 1, a connecting plate 42 arranged on one side of the plurality of mounting plates 41, and a plurality of spraying heads 43 fixed on the connecting plate 42; a water delivery head 44 is installed at one end of the spraying head 43 for connecting an external water delivery device to realize water supply; a cylinder 45 is fixed to one side of the mounting plate 41, and an output end of the cylinder 45 is fixed to one side of the connecting plate 42.

[0031] It should be noted that the spraying ends of the plurality of spray heads 43 face the surface of the core substrate and are evenly distributed on the connecting plate 42 in a linear array; one side of the connecting plate 42 is slidably connected to one side of the mounting plate 41 .

[0032] Specifically, the mounting plate 41 is fixed on the equipment frame 1, the connecting plate 42 is slidably connected to the mounting plate 41, and the cylinder 45 pushes the connecting plate 42 to move, so as to adjust the distance between the plurality of spray heads 43 on the connecting plate 42 and the surface of the core layer substrate. At the same time, the water supply head 44 is connected to an external water supply device to provide a water source for the spray head 43, and the spray head 43 sprays the water source in an atomized form to realize the pre-increase and post-increase of humidity. Moreover, since the plurality of spray heads 43 are distributed in a linear array, the humidity spraying is ensured to be uniform, which helps to improve the hygroscopic properties of the core layer substrate and provides favorable conditions for the subsequent embedding of the polymer water-absorbing resin.

[0033] In some embodiments, the gluing mechanism 3 includes: a melt cylinder 31 fixed on the inner side of the equipment frame 1, a heating layer 32 arranged inside the melt cylinder 31, and a plurality of glue spray heads 33 fixed on one side of the melt cylinder 31; a plurality of glue delivery heads are installed on the other side of the melt cylinder 31 for realizing adhesive supply by external glue delivery equipment.

[0034] It should be noted that the heating layer 32 realizes the change of the adhesive liquid state by heat radiation or heat conduction; the spray ends of the plurality of spray heads 33 are oriented toward the side of the top layer or bottom layer material facing the core layer substrate, and are evenly distributed on the melt tube 31 in a linear array.

[0035] Specifically, an external glue delivery device is used to provide adhesive to the glue melt cylinder 31, and the heating layer 32 in the glue melt cylinder 31 is used to heat the adhesive by heat radiation or heat conduction to change it from a semi-solid state to a liquid state, thereby ensuring a spraying effect. Since the glue spray heads 33 on one side of the glue melt cylinder 31 are distributed in a linear array, the adhesive is evenly sprayed on the side of the top or bottom substrate facing the core layer, which helps to improve the bonding strength between the three layers of the substrate and ensure the overall performance of the medical nursing pad.

[0036] In some embodiments, the SAP spraying mechanism 5 includes: a discharge cone 51 arranged between the humidity spraying mechanism 4 and the second composite mechanism 6, and a feeding head 52 installed on one side of the discharge cone 51 for an external feeding device to realize the supply of polymer water-absorbing resin; the side surface of the discharge cone 51 is fixed to the inner side of the equipment frame 1, and the discharge end faces the top of the core layer substrate.

[0037] Specifically, the feeding head 52 is connected to an external feeding device to provide the high molecular weight water-absorbent resin to the unloading cone 51, and the high molecular weight water-absorbent resin is evenly sprayed on the core layer substrate through the unloading cone 51, so that the high molecular weight water-absorbent resin is evenly embedded in the core layer substrate, which helps to improve the overall comfort and use effect of the medical nursing pad.

[0038] A method for using a gluing composite device for preparing a medical nursing pad comprises the following steps: S1, respectively passing the top layer, core layer and bottom layer substrates through the top layer conveying mechanism 11, the core layer conveying mechanism 12 and the bottom layer conveying mechanism 13 in sequence, and driving the three to feed toward the first composite mechanism 2; S2, during the feeding of the core layer substrate, two groups of humidity spraying mechanisms 4 are used to pre-increase the humidity by atomizing spraying once, and then post-increase the humidity by atomizing spraying twice, according to the target humidity of the core layer substrate; S3, spraying the embedded polymer water-absorbing resin on the top of the core layer substrate whose humidity increases for a certain interval time through the SAP spraying mechanism 5, and compounding the polymer water-absorbing resin and the core layer substrate into a core layer through the second compounding mechanism 6; S4, spray adhesive onto the top layer and bottom layer substrates facing the core layer substrate respectively through two sets of gluing mechanisms 3, and composite the top layer, core layer and bottom layer substrates into a nursing pad with a sandwich structure through the first composite mechanism 2.

[0039] In some embodiments, in step S2, the target humidity is 4-10% of the total mass of the core layer substrate.

[0040] In some embodiments, in step S2, the spraying direction of the first atomization spraying is the top of the core layer substrate, and the spraying direction of the second atomization spraying is the bottom of the core layer substrate.

[0041] In some embodiments, in step S3, the interval time is 6-15 s.

[0042] In order to further make the purpose and effect of the present invention simple and easy to understand, the present invention is further explained in combination with the following specific examples and comparative examples; wherein the top layer substrate is a non-woven fabric, the core layer substrate is a fluff pulp pressed into a sheet, each 100 kg of fluff pulp has a water content of 2 kg, the bottom layer substrate is a PE film, and the particle size of the polymer water-absorbing resin is 100 mesh. Example 1

[0043] A method for using a gluing composite device for preparing a medical nursing pad comprises the following steps: S1, respectively passing the non-woven fabric, fluff pulp and PE film through the top layer conveying mechanism 11, the core layer conveying mechanism 12 and the bottom layer conveying mechanism 13 in sequence, and driving the three to feed toward the first composite mechanism 2; S2, during the feeding of the fluff pulp, two groups of humidity spraying mechanisms 4 are used to spray 1.8 kg of water once to the top of the fluff pulp for each 100 kg of fluff pulp as the total mass to increase the humidity, and then 4.2 kg of water is sprayed twice to the bottom of the fluff pulp to increase the humidity; S3, spraying SAP onto the top of the fluff pulp after the humidity has increased for 11 seconds through the SAP spraying mechanism 5, and compounding the SAP and the fluff pulp into a core layer through the second compounding mechanism 6; S4, spray adhesive onto the non-woven fabric and the side of the PE film facing the core layer through two sets of gluing mechanisms 3, and composite the non-woven fabric, the core layer and the PE film into a nursing pad with a sandwich structure through the first composite mechanism 2. Example 2

[0044] This embodiment is basically the same as Embodiment 1, except that in step S2, the target humidity is 10%, 2.4 kg of water is sprayed in the first atomization, and 5.6 kg of water is sprayed in the second atomization. Example 3

[0045] This embodiment is basically the same as Embodiment 1, except that in step S2, the target humidity is 4%, 0.6 kg of water is sprayed in the first atomization, and 1.4 kg of water is sprayed in the second atomization. Example 4

[0046] This embodiment is basically the same as Embodiment 1, except that in step S3, the interval time is 6 s. Example 5

[0047] This embodiment is basically the same as Embodiment 1, except that in step S3, the interval time is 15 s.

[0048] Comparative Example 1 This comparative example is basically the same as Example 1, except that in step S2, the target humidity is 2%, and there is no pre-increase or post-increase of humidity.

[0049] Comparative Example 2 This comparative example is basically the same as Example 1, except that in step S2, the target humidity is 12%, 3 kg of water is sprayed in the first atomization, and 7 kg of water is sprayed in the second atomization.

[0050] Comparative Example 3 This comparative example is basically the same as Example 1, with the difference being that step S2 is specifically as follows: during the feeding of the fluff pulp, a group of humidity spraying mechanisms 4 are used to spray 6 kg of water in atomization manner on the top of the fluff pulp for every 100 kg of fluff pulp as the total mass, according to the target humidity of 8%, to increase the humidity.

[0051] Comparative Example 4 This comparative example is basically the same as Example 1, with the difference that in step S2, the spraying direction of the first atomization spray is the bottom of the fluff pulp, and the spraying direction of the second atomization spray is the top of the fluff pulp.

[0052] Comparative Example 5 This comparative example is substantially the same as Example 1, except that in step S3, the interval time is 3 s.

[0053] Comparative Example 6 This comparative example is substantially the same as Example 1, except that in step S3, the interval time is 20 s.

[0054] Performance test: Referring to GB / T 2792-2014 "Test method for peel strength of adhesive tape", the nursing pads obtained in Examples 1-5 and Comparative Examples 1-6 were tested for adhesive strength. The average value was taken after three parallel tests. The agglomeration and dispersion of SAP in the core layer were observed. The results are shown in Table 1.

[0055] Table 1: Performance test results

[0056] From Table 1 and Figure 3 It can be seen that: Figure 3 (a) and (b) show the actual pictures of the nursing pads prepared after the glue compounding of Example 1 and Comparative Example 1, respectively. By comparing Example 1 with Comparative Example 1, it can be known that by increasing the humidity of the core layer substrate, the surface resistance of the fiber can be reduced, the electrostatic adsorption effect can be eliminated, and the SAP particles can be evenly embedded in the fiber network to avoid agglomeration and voids. At the same time, the glue can fully penetrate into the deep layer of the fiber to improve the interfacial bonding force, thereby enhancing the bonding strength of the nursing pad after gluing. If the core layer substrate is too dry, the surface static electricity increases, causing the SAP particles to agglomerate due to electrostatic adsorption and unable to be evenly dispersed in the fiber network, forming local accumulation or voids, so that the nursing pad after gluing has the situation of agglomeration and uneven dispersion, affecting the liquid absorption performance of the core layer, and the glue only stays on the surface of the core layer substrate and fails to form an effective bond with the deep fiber, so that the bonding strength of the nursing pad after gluing is reduced, and it is easy to delaminate and peel off.

[0057] By comparing Examples 1-3 with Comparative Example 2, it can be learned that when the humidity of the core layer substrate is too high, although the static electricity effect is eliminated, a large number of water molecules will exist between and inside the fibers. During the bonding process, the glue needs to penetrate between the fibers and form strong interactions such as chemical bonds or hydrogen bonds with the fibers. The water molecules with increased humidity will occupy the interaction positions, making it difficult for them to be tightly combined, affecting the bonding strength. At the same time, it will also make it more difficult for the SAP particles to be evenly embedded in the fiber network, affecting the penetration and diffusion of the SAP particles, resulting in agglomeration and uneven dispersion.

[0058] By comparing Example 1 with Comparative Example 3, it can be seen that by pre-increasing the humidity at the top of the core layer substrate, water first penetrates through the fiber capillary action to form a liquid bridge network, neutralizes the static electricity on the fiber surface, and forms a humidity gradient in which the internal humidity is greater than the surface humidity, thereby avoiding excessive moisture on the surface layer caused by one-time spraying and affecting subsequent SAP dispersion and glue penetration. Moreover, on the basis of pre-infiltration, the humidity is post-increased at the bottom of the core layer substrate, so that the liquid bridge network formed by the pre-infiltration accelerates the diffusion of the top moisture, avoids the accumulation of moisture on the surface, reduces the risk of agglomeration, and achieves the internal and external connection of the fiber. The humidity of the surface layer is balanced to ensure the uniformity of subsequent SAP spreading and glue coating. By comparing Example 1 with Comparative Example 4, it can be seen that when the humidity of the bottom is pre-increased first and then the humidity of the top is post-increased, it is easy to cause insufficient diffusion of moisture upward, and then the moisture increased after the humidity is increased penetrates too slowly. When spraying SAP particles, there is a situation where more moisture remains on the top surface, resulting in more swelling of the sprayed SAP particles due to the reaction, making it difficult to embed into the fiber gaps, and being forced to accumulate on the surface to agglomerate and clump and unevenly distributed, and hindering the glue from penetrating downward, resulting in uneven distribution of the glue layer.

[0059] By comparing Example 1 and Examples 4-5 with Comparative Examples 5-6, it can be learned that by accurately controlling the interval time from humidity increase to spraying of SAP particles, the moisture after humidity increase can be uniformly infiltrated into the core layer substrate, avoiding excessive concentration of moisture in local areas, reducing agglomeration or uneven dispersion of SAP particles due to uneven water absorption, and hindering glue penetration, and avoiding the influence of too long interval on production line efficiency, thereby ensuring the efficiency of gluing and lamination while balancing moisture diffusion and static elimination.

[0060] The above is based on the ideal embodiment of the present invention. Through the above description, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0061] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A gluing and laminating device for preparing medical nursing pads, characterized in that: include: An equipment frame, a top layer conveying mechanism, a core layer conveying mechanism and a bottom layer conveying mechanism sequentially installed on the inner side of the equipment frame from top to bottom, and a first compounding mechanism installed on the inner side of the equipment frame near one end for compounding the top layer, the core layer and the bottom layer substrate into a sandwich structure; Two groups of gluing mechanisms are arranged between the first compounding mechanism and the core layer conveying mechanism for spraying adhesive respectively on the top layer and bottom layer substrates facing the core layer substrate; two groups of humidity spraying mechanisms, a SAP spraying mechanism and a second compounding mechanism are arranged in sequence in the direction of the core layer conveying mechanism toward the first compounding mechanism; The two groups of humidity spraying mechanisms are symmetrically arranged at the top and bottom of the core layer substrate in sequence, and are used to pre-increase the humidity and post-increase the humidity of the core layer substrate in sequence; the SAP spraying mechanism is used to spray the embedded polymer water-absorbing resin onto the core layer substrate; the second composite mechanism is used to composite the polymer water-absorbing resin and the core layer substrate into a core layer.

2. The gluing and laminating device for preparing a medical nursing pad according to claim 1, characterized in that: The humidity spraying mechanism comprises: a plurality of mounting plates fixed on the inner side of the equipment frame, a connecting plate arranged on one side of the mounting plates, and a plurality of spraying heads fixed on the connecting plates; a water delivery head is installed at one end of the spraying head for connecting an external water delivery device to realize water supply; a cylinder is fixed on one side of the mounting plate, and an output end of the cylinder is fixed to one side of the connecting plate.

3. The gluing and laminating device for preparing a medical nursing pad according to claim 2, characterized in that: The spraying ends of the plurality of spraying heads face the surface of the core layer substrate and are evenly distributed on the connecting plate in a linear array; one side of the connecting plate is slidably connected to one side of the mounting plate.

4. The gluing and laminating device for preparing a medical nursing pad according to claim 1, characterized in that: The gluing mechanism includes: a melt-glue cylinder fixed on the inner side of the equipment frame, a heating layer arranged inside the melt-glue cylinder, and a plurality of glue spray heads fixed on one side of the melt-glue cylinder; a plurality of glue delivery heads are installed on the other side of the melt-glue cylinder for connecting to an external glue delivery device to realize adhesive supply.

5. The gluing and laminating device for preparing a medical nursing pad according to claim 4, characterized in that: The heating layer realizes the change of the liquid form of the adhesive by means of heat radiation or heat conduction; the spray ends of several of the spray heads face the top layer or the bottom layer material facing the side of the core layer substrate, and are evenly distributed on the melt cylinder in a linear array.

6. The gluing and laminating device for preparing a medical nursing pad according to claim 1, characterized in that: The SAP spraying mechanism includes: a discharge cone cylinder arranged between the humidity spraying mechanism and the second composite mechanism, and a feeding head installed on one side of the discharge cone cylinder for external feeding equipment to realize the supply of polymer water-absorbing resin; the side surface of the discharge cone cylinder is fixed to the inner side of the equipment frame, and the discharge end faces the top of the core layer substrate.

7. A method for using a gluing composite device for preparing a medical nursing pad according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, respectively passing the top layer, core layer and bottom layer substrates through the top layer conveying mechanism, the core layer conveying mechanism and the bottom layer conveying mechanism in sequence, and driving the three to feed toward the first composite mechanism; S2, during the feeding of the core layer substrate, two groups of humidity spraying mechanisms are used to pre-increase the humidity by atomizing spraying once, and then post-increase the humidity by atomizing spraying twice according to the target humidity of the core layer substrate; S3, spraying the embedded polymer water-absorbing resin on the top of the core layer substrate whose humidity increases by 6-15 s through the SAP spraying mechanism, and compounding the polymer water-absorbing resin and the core layer substrate into a core layer through the second compounding mechanism; S4. Use two sets of gluing mechanisms to spray adhesive on the top layer and the bottom layer substrate facing the core layer substrate respectively, and use the first compounding mechanism to compound the top layer, the core layer and the bottom layer substrate into a nursing pad with a sandwich structure.

8. The method for using the gluing and laminating device for preparing a medical nursing pad according to claim 7, characterized in that: In the step S2, the target humidity is 4-10% of the total mass of the core layer substrate.

9. The method for using the gluing composite device for preparing a medical nursing pad according to claim 7, characterized in that: In the step S2, the spraying direction of the primary atomization spraying is the top of the core layer substrate, and the spraying direction of the secondary atomization spraying is the bottom of the core layer substrate.

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