High-diffusivity absorption core

Abstract

The utility model relates to the field of disposable hygienic products, in particular to a high-diffusivity absorption core which is high in diffusion speed and absorption efficiency and comprises a core body, and the core body comprises an upper covering layer, a lower covering layer and a middle layer clamped between the upper covering layer and the lower covering layer, a reference surface of the middle layer is concavely provided with a plurality of upper accommodating grooves downwards, the reference surface of the middle layer is concavely provided with a plurality of lower accommodating grooves upwards, each row of the upper accommodating grooves and each row of the lower accommodating grooves are distributed in a staggered manner at intervals along the longitudinal direction, and the density of the middle layer measured under the pressure of 5.4 kPa is less than 0.64 g / cm < 3 >. The middle layer comprises at least one diversion trench which does not contain macromolecular water-absorbent resin particles and extends in the longitudinal direction, and the upper covering layer and the lower covering layer are respectively adhered to the upper surface and the lower surface of the middle layer.

Description

Technical Field

[0001] The utility model relates to the field of disposable sanitary products, in particular to a highly diffusible absorbent core. Background Art

[0002] Absorbent cores are widely used in nursing absorbent products such as diapers and sanitary napkins. The absorbent core should be able to hold the effluent for a long time, for example, the diaper is used overnight, minimize backflow to keep the wearer dry, and avoid soiling clothes or sheets. Most currently commercially available absorbent cores are a mixture of comminuted wood pulp fibers as absorbent materials and a superabsorbent polymer resin material in granular form, and are formed into a block structure by being coated with a non-woven fabric. Such an absorbent core not only easily has problems such as lumping and breaking during use, but also has a large thickness and poor air permeability, reducing the comfort of users.

[0003] The absorbent core widely used in the current market is composed of a double-layer non-woven fabric or a triple-layer non-woven fabric with a superabsorbent polymer resin material sandwiched in the middle. The superabsorbent polymer resin material is spread on the upper surface of one layer of the non-woven fabric, and then another layer of the non-woven fabric is compounded by spraying glue. Such an absorbent core has a relatively thin thickness, but the superabsorbent polymer resin material is not easy to fix, easily causes the superabsorbent polymer resin material to deviate or leak, seriously affecting the water absorption efficiency. Summary of the Utility Model

[0004] Therefore, in view of the above problems, the utility model provides a highly diffusible absorbent core with a fast diffusion speed and a high absorption efficiency.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A highly diffusible absorbent core includes a core body. The longitudinal direction is defined as extending along the length direction of the core body, and the transverse direction is defined as extending along the width direction of the core body;

[0007] The core body includes a liquid-permeable upper cover layer, a lower cover layer, and an intermediate layer sandwiched between the upper cover layer and the lower cover layer. The average grammage of the intermediate layer is 5 g / m 2 ~350 g / m 2 , the intermediate layer has a front edge and a rear edge at both longitudinal ends and two side edges extending in the longitudinal direction. The intermediate layer has a reference plane parallel to the horizontal plane surrounded by the front edge, the rear edge, and the side edges. The reference plane of the intermediate layer is recessed downward with a plurality of upper accommodation grooves, and each of the upper accommodation grooves is arranged in a row. The reference plane of the intermediate layer is recessed upward with a plurality of lower accommodation grooves, and each of the lower accommodation grooves is arranged in a row. Each row of the upper accommodation grooves and each row of the lower accommodation grooves are alternately distributed at intervals in the longitudinal direction. Moreover, the intermediate layer has a value less than 0.64 g / cm measured under a pressure of 5.4 kPa3 The density, and the angle between the connection line of the upper accommodating grooves in the same row or the connection line of the lower accommodating grooves in the same row and the longitudinal central axis of the intermediate layer is 5° to 75°. The upper accommodating grooves and the lower accommodating grooves are both filled with high molecular water-absorbing resin particles. The orthographic projection areas of the upper accommodating grooves and the lower accommodating grooves are 0.1 cm 2 ~10 cm 2 . The gram weight of the high molecular water-absorbing resin particles in the intermediate layer is 0.01 g / m 2 ~1000 g / m 2 ;

[0008] The intermediate layer includes at least one longitudinally extending diversion groove that does not contain high molecular water-absorbing resin particles. The upper covering layer and the lower covering layer are adhesively attached to the upper surface and the lower surface of the intermediate layer respectively.

[0009] Furthermore, the water absorption capacity of the core body increases step by step from one longitudinal end of the core body to the other longitudinal end and then decreases step by step.

[0010] Furthermore, the density of the high molecular water-absorbing resin particles in the upper accommodating groove decreases step by step from the longitudinal middle part of the intermediate layer to the longitudinal two ends.

[0011] Furthermore, buffer cavities are provided by folding the lateral two sides of the upper covering layer and / or the lower covering layer.

[0012] Furthermore, the upper covering layer and / or the lower covering layer are further bonded to the intermediate layer in the diversion groove by one of adhesive bonding, mechanical bonding, ultrasonic bonding, pressure bonding or thermal bonding.

[0013] Furthermore, the diversion groove is surrounded by at least one area of the intermediate layer including high molecular water-absorbing resin particles, or the diversion groove extends from the front edge to the rear edge of the intermediate layer.

[0014] Furthermore, the ratio of the longitudinal length dimension of the diversion groove to the longitudinal length dimension of the absorption core body is 0.02 to 1:1.

[0015] Furthermore, the diversion groove is spaced apart from the side edge extending in the longitudinal direction of the core body.

[0016] Furthermore, there are two diversion grooves, and they are in an arc structure. The two diversion grooves are symmetrically distributed along the transverse central axis of the core body.

[0017] Furthermore, the upper covering layer and / or the lower covering layer are further bonded to the intermediate layer at the front edge, the rear edge and the side edge by one of adhesive bonding, mechanical bonding, ultrasonic bonding, pressure bonding or thermal bonding.

[0018] By adopting the foregoing technical solution, the beneficial effects of the present utility model are as follows: for this highly diffusible absorbent core, an upper accommodation groove is recessed upward on the upper surface of the intermediate layer, and a lower accommodation groove is recessed upward on the lower surface of the intermediate layer. High molecular water-absorbing resin particles are filled in the upper accommodation groove and the lower accommodation groove respectively, and the upper cover layer and the lower cover layer are respectively covered on the upper surface and the lower surface of the intermediate layer to seal the high molecular water-absorbing resin particles in the upper accommodation groove and the lower accommodation groove. At the same time, the diversion grooves are provided, so that the effluent discharged onto the surface of the core body flows along the diversion direction of the diversion grooves and penetrates into the upper accommodation grooves and the lower accommodation grooves on the periphery, and is absorbed by the high molecular water-absorbing resin particles. The included angle between the connection line of the upper accommodation grooves in the same row or the connection line of the lower accommodation grooves in the same row and the longitudinal central axis of the intermediate layer is 5° to 75°, so that an area without the upper accommodation groove and the lower accommodation groove, which coincides with the reference plane of the intermediate layer, is formed without applying high molecular water-absorbing resin particles, that is, there is a gap between the upper accommodation groove and the lower accommodation groove, realizing the diversion of fine tributaries in the plane direction, thereby improving the diffusion effect. Coupled with the material characteristics of the intermediate layer, the effluent flows in the diversion grooves and penetrates into the intermediate layer of the diversion grooves, and then laterally penetrates through the intermediate layer, which can form a lateral diversion effect on the effluent, and at the same time can improve the pressing and overlapping ability and the lateral tensile performance of the intermediate layer. Combined with the included angle between the connection line of the upper accommodation grooves in the same row or the connection line of the lower accommodation grooves in the same row and the longitudinal central axis of the intermediate layer being 5° to 75°, the forming depth of the upper accommodation groove and the lower accommodation groove is ensured, and the breakage of the intermediate layer is avoided. Description of the Drawings

[0019] Figure 1 is a top view structural schematic diagram of the core body in an embodiment of the present utility model;

[0020] Figure 2 is a top view structural schematic diagram of the intermediate layer in an embodiment of the present utility model;

[0021] Figure 3 is Figure 1 a cross-sectional structural schematic diagram at A-A in

[0022] Figure 4 is Figure 3 a partial enlarged view at B in

[0023] Figure 5 is a production flow chart of the core body in an embodiment of the present utility model;

[0024] Figure 6 is a structural schematic diagram of the blanking roller in an embodiment of the present utility model;

[0025] Figure 7 is a three-dimensional structural schematic diagram of the upper embossing roller in an embodiment of the present utility model;

[0026] Figure 8 Is Figure 7 The partial enlarged view at position C in

[0027] Figure 9 It is the front view structural schematic diagram of the upper embossing roller in the embodiment of the present utility model;

[0028] Figure 10 Is Figure 9 The sectional view structural schematic diagram at D-D in

[0029] Figure 11 It is the structural schematic diagram of the test instrument in the embodiment of the present utility model. Specific embodiments

[0030] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] The embodiment of the present utility model is as follows:

[0032] Refer to Figures 1 to 4 As shown, a highly diffusible absorbent core includes a core body 1. The longitudinal direction is defined as the direction extending along the length of the core body 1, and the transverse direction is defined as the direction extending along the width of the core body 1.

[0033] The core body 1 includes a liquid-permeable upper cover layer 11, a lower cover layer 12, and an intermediate layer 13 sandwiched between the upper cover layer 11 and the lower cover layer 12. The transverse width dimension of the intermediate layer 13 is 1 cm to 150 cm, preferably 12 cm. The intermediate layer 13 is a wood pulp fiber product such as expanded paper or a plant fiber product or a critical material such as a foaming material like polyether, polyurethane, polyvinyl alcohol, polyester, etc., preferably expanded paper. It uses pulp board, old newsprint, old writing paper, yellow core card waste paper as raw materials, and is equipped with auxiliary materials such as deinking agent, bleaching agent, cationic starch, swelling agent, SPN-1 rosin size, liquid aluminum sulfate, etc. Then the above raw materials and auxiliary materials are mixed to form pulp, and the pulp is formed into a wet paper web through a paper making machine, and finally the wet paper web is dried to evaporate its moisture to form expanded paper. The average grammage of the intermediate layer is 5 g / m 2 ~350 g / m 2 Preferably 180 g / m 2 .

[0034] The intermediate layer 13 has a front edge 131, a rear edge 132 located at both longitudinal ends, and two side edges 133 extending in the longitudinal direction. The intermediate layer 13 has a reference plane 134 parallel to the horizontal plane surrounded by the front edge 131, the rear edge 132, and the side edges 133. The reference plane 134 of the intermediate layer 13 is recessed downward with a plurality of upper accommodation grooves 2, and each of the upper accommodation grooves 2 is arranged in a row. The reference plane of the intermediate layer 13 is recessed upward with a plurality of lower accommodation grooves 3, and each of the lower accommodation grooves 3 is arranged in a row. Each row of the upper accommodation grooves 2 and each row of the lower accommodation grooves 3 are spaced and staggered in the longitudinal direction. Moreover, the intermediate layer 13 has a density measured under a pressure of 5.4 kPa of less than 0.64 g / cm 3 and preferably 0.52 g / cm 3 . The angle between the connection line a of the upper accommodation grooves 2 in the same row or the connection line b of the lower accommodation grooves 3 in the same row and the longitudinal central axis c of the intermediate layer 13 is 5° to 75°, preferably 45°. The upper accommodation grooves 2 and the lower accommodation grooves 3 are both filled with superabsorbent polymer particles 4. The orthographic projection areas of the upper accommodation grooves 2 and the lower accommodation grooves 3 are 0.1 cm 2 to 10 cm 2 , preferably 1.2 cm 2 . The weight of the superabsorbent polymer particles 4 in each of the upper accommodation grooves 2 and the lower accommodation grooves 3 is 0.01 g to 5 g, preferably 0.32 g.

[0035] The superabsorbent polymer particles 4 are such that they can flow in the dry state and thus are easily deposited on the intermediate layer. Typical granular superabsorbent polymer materials are made of poly(meth)acrylic acid polymers. However, it is not excluded that other polymer materials can also be used. The superabsorbent polymer particles can be relatively small in their dry state (their longest dimension is less than 1 mm), and can be approximately circular in shape, but pellet materials, fibers, flakes, spheres, powders, sheets, and other shapes and forms are also known to those skilled in the art. Generally, the superabsorbent polymer particles can be in the form of spherical particles.

[0036] The intermediate layer 13 includes at least one longitudinally extending diversion groove 5 that substantially does not contain the superabsorbent polymer particles 4. The upper cover layer 11 and the lower cover layer 12 are adhesively attached to the upper surface and the lower surface of the intermediate layer 13 respectively.

[0037] The so-called "substantially free of superabsorbent resin particles 4" means that the gram weight of the superabsorbent resin particles 4 in each of these regions is at least less than 25%, preferably less than 20%, more preferably less than 10% of the average gram weight of the superabsorbent resin particles 4 in the intermediate layer 13 as a whole. Specifically, the flow guide groove 5 may be a region of the intermediate layer 13 where no superabsorbent resin particles 4 are present. In this regard, a small amount of contaminants such as unintentionally carried superabsorbent resin particles that may occur during the preparation process are not considered absorbent materials.

[0038] The intermediate layer 13 is sandwiched between the upper cover layer 11 and the lower cover layer 12. The upper cover layer 11 is located on the side of the core body 1 that is intended to be placed closest to the wearer side of the absorbent article. The upper cover layer 11 is thus liquid-permeable so that during use, fluid can easily pass through the upper cover layer 11 to reach the intermediate layer 13. The lower cover layer 12 is positioned on the other side of the intermediate layer 13. It can be liquid-permeable or liquid-impermeable. The upper cover layer 11 and the lower cover layer 12 provide coverings on these two sides of the intermediate layer to prevent superabsorbent resin particles from escaping from the intermediate layer during the preparation of the core body 1 and the article and during the use of the absorbent article.

[0039] The upper cover layer 11 and the lower cover layer 12 can be, for example, tissue papers (airlaid felt or wet-laid), which have a basis weight in the range of, for example, 5 to 100 gsm, specifically 10 to 40 gsm. The upper cover layer 11 and the lower cover layer 12 can also be formed from low-basis-weight nonwoven fiber webs having a basis weight between 5 gsm and 30 gsm, such as carded nonwovens, spunbond nonwovens or meltblown nonwovens, and laminates of any of these fiber webs. For example, a melt-spun polypropylene nonwoven fabric with a basis weight in the range of about 5 gsm to 20 gsm. Nonwoven materials are generally inherently hydrophobic, and the upper cover layer can thus be treated to make it hydrophilic, for example, by treating it with surfactants or other methods known in the art. The upper cover layer and the lower cover layer can be made of the same or different materials, and optionally, the upper cover layer or the lower cover layer can be treated in different ways to make the upper cover layer more hydrophilic than the lower cover layer.

[0040] This highly diffusible absorbent core has an upper receiving groove 2 recessed upward from the reference surface 134 of the intermediate layer 13, and a lower receiving groove 3 recessed upward from the reference surface 134 of the intermediate layer 13. High molecular water-absorbing resin particles 4 are filled in the upper receiving groove 2 and the lower receiving groove 3 respectively, and the upper cover layer 11 and the lower cover layer 12 cover the upper surface and the lower surface of the intermediate layer 13 respectively to seal the high molecular water-absorbing resin particles 4 in the upper receiving groove 2 and the lower receiving groove 3. At the same time, a diversion groove 5 is provided, so that the effluent discharged onto the surface of the core body 1 flows along the diversion direction of the diversion groove 5 and seeps into the surrounding upper receiving groove 2 and lower receiving groove 3, and is absorbed by the high molecular water-absorbing resin particles 4. The angle between the connecting line a of the upper receiving grooves 2 in the same row or the connecting line b of the lower receiving grooves 3 in the same row and the longitudinal central axis c of the intermediate layer 13 is 5° to 75°, so that an area without the upper receiving groove 2 and the lower receiving groove 3 that coincides with the reference surface 134 of the intermediate layer 13 is formed without applying the high molecular water-absorbing resin particles 4, that is, there is a gap between the upper receiving groove 2 and the lower receiving groove 3, realizing the diversion of fine tributaries in the plane direction, thereby improving the diffusion effect. Coupled with the material characteristics of the intermediate layer 13, the effluent flows in the diversion groove 5 and seeps into the intermediate layer 13 of the diversion groove 5, and then laterally penetrates through the intermediate layer 13, which can form a lateral diversion effect of the effluent, and at the same time can improve the pressing ability and lateral tensile performance of the intermediate layer 13, and is combined with the angle between the connecting line a of the upper receiving grooves 2 in the same row or the connecting line b of the lower receiving grooves 3 in the same row and the longitudinal central axis c of the intermediate layer 13 being 5° to 75°, ensuring the forming depth of the upper receiving groove 2 and the lower receiving groove 3 and avoiding the fracture of the intermediate layer 13.

[0041] Moreover, the water absorption capacity of the core body 1 increases step by step from one longitudinal end to the other longitudinal end and then decreases step by step. Specifically, the density of the high molecular water-absorbing resin particles 4 in the upper receiving groove 2 decreases step by step from the longitudinal middle part of the intermediate layer 13 to the longitudinal two ends, or the density of the high molecular water-absorbing resin particles 4 in the lower receiving groove 3 decreases step by step from the longitudinal middle part of the intermediate layer 13 to the longitudinal two ends, so that a difference in water absorption capacity is formed in the longitudinal direction of the core body 1. In this way, a more efficient water absorption capacity can be formed according to the body shape characteristics, and at the same time, the usage amount of the high molecular water-absorbing resin particles can be reduced, thereby reducing the production cost.

[0042] Under normal circumstances, the orthographic projection areas of the upper receiving groove 2 and the lower receiving groove 3 are equal. Of course, the orthographic projection area of ​​the upper receiving groove 2 can also be smaller than the orthographic projection area of ​​the lower receiving groove 3, or the orthographic projection area of ​​the upper receiving groove 2 can be larger than the orthographic projection area of ​​the lower receiving groove 3, so that a spacing is formed between the upper receiving grooves 2 with smaller areas or between the lower receiving grooves 3 with smaller areas, thereby forming a larger guide channel to facilitate the lateral flow of the outflowing liquid and further improve the diffusion effect; and the volume of the polymer water-absorbing resin particles 4 filled in the upper receiving groove 2 or the lower receiving groove 3 usually accounts for 1 / 8 to 4 / 5 of the volume of the upper receiving groove 2 or the lower receiving groove 3, preferably 3 / 5, so that the polymer water-absorbing resin particles 4 have expansion space, which can ensure that the polymer water-absorbing resin particles 4 fully absorb water, improve the utilization rate, and thus improve the water absorption efficiency.

[0043] Furthermore, the actual depth dimension of the upper accommodating groove 2 is twice the vertical distance between the bottom end of the upper accommodating groove 2 and the reference plane 134, and the depth dimension of the upper accommodating groove 2 is 0.5mm~12mm, preferably 4mm. The depth dimension of the molded lower accommodating groove 3 is twice the vertical distance between the bottom end of the lower accommodating groove 3 and the reference plane 134, and the depth dimension of the lower accommodating groove 3 is 0.5mm~12mm, preferably 4mm. Under normal circumstances, for the sake of production efficiency and production cost considerations, the depth dimension of the upper accommodating groove 2 is usually equal to the depth dimension of the lower accommodating groove 3. Of course, the depth dimension of the upper accommodating groove 2 can also be set to be greater than the depth dimension of the lower accommodating groove 3, or the depth dimension of the upper accommodating groove 2 can be smaller than the depth dimension of the lower accommodating groove 3, so that there is a difference in the water absorption on the upper and lower sides of the reference plane 134, which can reduce the reverse osmosis effect.

[0044] At the same time, the upper covering layer 11 and / or the lower covering layer 12 are folded on both lateral sides to provide a buffer cavity 6. Preferably, the upper covering layer 11 is folded on both lateral sides to provide a buffer cavity 6, that is, during the transportation of the upper covering layer 11, a Z-shaped structure area is folded by a folding plate. In this way, after the polymer water-absorbing resin particles 4 absorb water and expand, the bonding area between the upper covering layer 11 and the middle layer 13 is pushed open, and the buffer cavity 6 is opened, thereby increasing the buffer space of the polymer water-absorbing resin particles 4 and thus the water absorption efficiency.

[0045] In this embodiment, the upper cover layer 11 and / or the lower cover layer 12 are further bonded to the intermediate layer 13 in the diversion groove 5 by one of adhesive bonding, mechanical bonding, ultrasonic bonding, pressure bonding or thermal bonding. Preferably, it is ultrasonic bonding. The upper cover layer 11 and / or the lower cover layer 12 are further bonded to the intermediate layer 13 in the front edge 131, rear edge 132 and side edge 133 by one of adhesive bonding, mechanical bonding, ultrasonic bonding, pressure bonding or thermal bonding. Preferably, it is ultrasonic bonding, so as to improve the connection strength of the upper cover layer 11, intermediate layer 13 and lower cover layer 12 and improve the diversion effect of the diversion groove 5.

[0046] The diversion groove 5 is surrounded by at least one area 135 of the intermediate layer 13 including superabsorbent resin particles 4. The diversion groove 5 is spaced apart from the side edge 133 extending in the longitudinal direction of the core body 1, so that the diversion groove 5 is located in the middle of the core body 1. When the superabsorbent resin particles 4 are applied to the intermediate layer 13, the feeding groove on the feeding roller is aligned with the upper accommodating groove 2 or the lower accommodating groove 3 for positioning, and the superabsorbent resin particles 4 are filled, so that the superabsorbent resin particles 4 are not applied in the area of the diversion groove 5, thereby ensuring the diversion effect of the diversion groove 5 and improving the production efficiency of the product. Or the diversion groove 5 extends from the front edge 131 to the rear edge 132 of the intermediate layer 13, so that the diversion groove 5 penetrates along the longitudinal direction. When the superabsorbent resin particles 4 are applied to the intermediate layer 13, the feeding of the superabsorbent resin particles 4 can be blocked by a baffle to form the diversion groove 5.

[0047] Moreover, the ratio of the longitudinal length dimension of the diversion groove 5 to the longitudinal length dimension of the absorbent core body 1 is 0.02 - 1:1. Preferably, the ratio is 0.73:1, so that the diversion groove 5 is distributed along the longitudinal direction on the core body 1, and the area 135 covered with more superabsorbent resin particles 4 on the peripheral side can be quickly absorbed during diversion, improving the absorption efficiency.

[0048] Furthermore, there are two diversion grooves 5, and they are in an arc structure. The two diversion grooves 5 are symmetrically distributed along the transverse central axis of the core body 1.

[0049] Reference Figures 5 to 10 As shown, a preparation process of a highly diffusible absorbent core includes the following steps:

[0050] 1) Prepare an absorbent core layer. The absorbent core layer has continuously conveyed absorbent units. Define the direction of extension along the conveying direction of the absorbent core layer as the longitudinal direction, and the direction of extension along its width direction as the transverse direction;

[0051] a) Unroll and convey the intermediate layer 13 through the first unrolling unit 21. The first unrolling unit 21 is equipped with a servo motor and is connected to the control unit. Through the control unit, the starting time of the servo motor and the rotational speed of the servo motor can be determined, and thus the conveying starting point and conveying speed of the intermediate layer 13 can be determined. Moreover, the lateral width dimension of the intermediate layer 13 is 1 cm to 150 cm, and the average grammage of the intermediate layer 13 is 5 g / m 2 ~350 g / m 2 ;

[0052] b) Obtain the conveying starting point and conveying speed of the intermediate layer 13 in step a, and determine the boundaries of each absorption unit by means of the longitudinal length dimension of the absorption unit pre-entered into the control unit;

[0053] c) Obtain the boundaries of each absorption unit in step b, and define the plane where the intermediate layer 13 is conveyed as the reference plane 134. The intermediate layer 13 is provided with a plurality of upper accommodation grooves 2 recessed downward on the reference plane 134 within the absorption unit by the upper embossing roller 22 and the lower embossing roller 23. Each of the upper accommodation grooves 2 is arranged in a row. The intermediate layer 13 is provided with a plurality of lower accommodation grooves 3 recessed upward on the reference plane 134 within the absorption unit. Each of the lower accommodation grooves 3 is arranged in a row. Each row of the upper accommodation grooves 2 and each row of the lower accommodation grooves 3 are spaced and staggered in the longitudinal direction. Moreover, the intermediate layer 13 has a value less than 0.64 g / cm measured under a pressure of 5.4 kPa 3 , and the angle between the connecting line a of the upper accommodation grooves 2 in the same row or the connecting line b of the lower accommodation grooves 3 in the same row and the longitudinal central axis c of the intermediate layer 13 is 5° to 75°. The orthographic projection area of the upper accommodation grooves 2 and the lower accommodation grooves 3 is 0.1 cm 2 ~10 cm 2 ;

[0054] d) Obtain the boundaries of each absorption unit in step b, and periodically add superabsorbent resin particles 4 into the upper accommodation grooves 2 of the continuous absorption units of the intermediate layer 13 through the first blanking unit 24. The first blanking unit 24 includes a blanking roller 201. At least one blanking area 202 matching the absorption unit is provided on the outer surface of the blanking roller 201. The coverage area of the blanking area 202 is the area of a single absorption unit. A blanking groove 203 for storing superabsorbent resin particles 4 is provided on the blanking area 202. That is, when the boundaries of each absorption unit are obtained so as to correspond to the blanking area 202 on the blanking roller 201, when the blanking roller 201 rotates for blanking, the superabsorbent resin particles 4 are accurately blanked into the corresponding single absorption unit through a single blanking area 202;

[0055] e) Unroll and convey the upper cover layer 11 through the second unwinding unit 25, apply glue to the lower surface of the upper cover layer 11, and adhere the upper cover layer 11 to the upper surface of the intermediate layer 13;

[0056] f) Flip the product in step e by 180°, so that the upper and lower surfaces of the intermediate layer 13 are swapped, and the lower surface of the intermediate layer 13 is on the upper side;

[0057] g) Obtain the boundaries of each absorption unit in step b, and periodically add superabsorbent resin particles 4 to the lower accommodation grooves 3 of the continuous absorption units of the intermediate layer 13 through the second blanking unit 26. The weight of the superabsorbent resin particles 4 in the intermediate layer 13 is 0.01 g / m 2 ~1000 g / m 2 , preferably 420 g. At least one diversion groove 5 extending in the longitudinal direction that is substantially free of superabsorbent resin particles 4 is formed within a single absorption unit on the intermediate layer 13;

[0058] h) Unroll and convey the lower cover layer 12 through the third unwinding unit 27, apply glue to the lower surface of the lower cover layer 12, and adhere the lower cover layer to the lower surface of the intermediate layer;

[0059] 2) Obtain the boundaries of each absorption unit in step b, and cut along the boundaries of the absorption units of the product in step h through the slitting unit 28 to form individual core body bodies.

[0060] Through the above preparation method, product improvement and upgrade can be achieved with minor modifications on the existing core production line, reducing the input cost. At the same time, precise positioning can be realized, so that the forming effects of the upper accommodation groove 2 and the lower accommodation groove 3 are good, and the superabsorbent resin particles 4 can be accurately filled into the upper accommodation groove 2 and the lower accommodation groove 3, improving the product quality and ensuring that the formed core body body 1 has good diffusibility and high water absorption efficiency.

[0061] The upper embossing roller 22 and the lower embossing roller 23 each include an embossing shaft 301, an embossing roller body 302, and two gear rings 303. The embossing roller body 302 is fixedly arranged on the embossing shaft 301 and is distributed in the middle of the embossing shaft 301 axially. On the outer peripheral surface of the embossing roller body 302, there are respectively a number of bumps 304 arranged in rows and a number of grooves 305 arranged in rows. Each row of the bumps 304 and each row of the grooves 305 are alternately distributed in sequence around the outer peripheral surface of the embossing roller body 302. There is at least one area 306 on the outer peripheral surface of the embossing roller body 302 where no bumps 304 and grooves 305 are provided. Preferably, there are two areas 306. And this area 306 is strip-shaped and distributed along the circumferential direction of the outer peripheral surface of the embossing roller body 302. The two areas 306 are in an arc structure and are axially symmetrically distributed along the central axis of the embossing roller body 302. The two gear rings 303 are fixedly arranged on the embossing shaft 301 and are distributed on both sides of the embossing roller body 302 axially. On the outer peripheral surfaces of the two gear rings 303, there are teeth (not shown in the figure).

[0062] During use, the upper embossing roller 22 and the lower embossing roller 23 are assembled in pairs, and the teeth of the gear ring 303 on the upper embossing roller 22 are meshed and connected with the teeth of the gear ring 303 on the lower embossing roller 23, so that the two embossing rollers can be synchronously driven. Furthermore, the bumps 304 on one embossing roller and the grooves 305 on the other embossing roller are accurately positioned and matched, improving the accuracy of transmission, avoiding subsequent debugging, and improving the embossing efficiency. At the same time, through the pressing of the two embossing rollers, the contour amplitude of the embossed pattern is increased, and the three-dimensional effect is remarkable, thereby improving the embossing effect.

[0063] In this embodiment, the bump 304 is in a semi-spherical structure or a cuboid structure or a frustum of a cone structure or a cylinder structure or a frustum of a pyramid structure. Preferably, it is in a semi-spherical structure. The groove 305 is in a semi-spherical structure or a cuboid structure or a frustum of a cone structure or a cylinder structure or a frustum of a pyramid structure. Preferably, it is in a semi-spherical structure, thereby reducing the transverse cutting force acting on the material, further avoiding the problem of material fracture, and facilitating embossing forming.

[0064] Further, the embossing shaft 301 includes a first shaft body 311 and a second shaft body 321. One of the gear rings 303 is provided on the first shaft body 311, and the other gear ring 303 is provided on the second shaft body 321. A first through hole 307 is provided through the central axis of the first shaft body 311. A second through hole 308 communicating with the first through hole 307 is provided at the outer end of the first shaft body 311. A third through hole 309 is provided on the first shaft body 311 and runs through in the radial direction thereof. The third through hole 309 communicates with the first through hole 307, reducing the weight of the embossing roller, thereby reducing the rotational inertia, enabling the embossing roller to rotate quickly, and thus improving the processing efficiency. At the same time, through the settings of the first through hole 307, the second through hole 308, and the third through hole 309, the transmission efficiency and connection strength of the embossing roller are improved.

[0065] Reference Figure 11 As shown, the detection method:

[0066] I. Prepare the instruments:

[0067] A vertical reference plate 101, the area of the vertical reference plate 101 being 1000 mm 2 ;

[0068] A pressing foot 102, the area of the pressing foot 102 being 1800 mm 2 ;

[0069] An L-shaped connecting rod 103, the L-shaped connecting rod 103 having two rod arms 123 of equal length, i.e., L1 = L2, and the two rod arms 123 being perpendicularly distributed;

[0070] A power supply 104; a light bulb 105; a screw rod 106; a scale 107; a first electrical contact rod 108, a second electrical contact rod 109; a tray 110; a counterweight 111; a support frame 112; a stopwatch;

[0071] A weight 113, the mass of the weight 113 being 0.54 KG;

[0072] The first electrical contact rod 108 is provided on the support frame 112. The second electrical contact rod 109 is provided on the support frame 112 through the L-shaped connecting rod 103, and the second electrical contact rod 109 can move along the transverse direction of the support frame 112. The connection point of the two rod arms 123 of the L-shaped connecting rod 103 is hinged to the support frame 112. The tray 110 is provided at the free end of the L-shaped connecting rod 103. The counterweight 111 is provided at one transverse end of the tray 110. The weight 113 is provided on the tray 110. The positive and negative poles of the power supply 104 are electrically connected to the first electrical contact rod 108 and the second electrical contact rod 109 respectively. The light bulb 105 is electrically connected to the first electrical contact rod 108. The vertical reference plate 101 is provided on the second electrical contact rod 109. The scale 107 is provided on the support frame 112. The screw rod 106 is connected to the scale 107. The pressure foot 102 is provided on the screw rod 106.

[0073] II. Detection steps:

[0074] a. Conduct the test under the standard atmospheric pressure for testing;

[0075] b. Prepare 10 intermediate layer specimens with an area of (80 ± 0.2) mm * (100 ± 0.2) mm. The intermediate layer specimens are specimens with an upper accommodation groove and a lower accommodation groove;

[0076] If the raw materials are not available, the intermediate layer specimens can be obtained in the following way: Carefully extract the intermediate layer from the core body and remove most of the superabsorbent polymer particles, for example, by carefully shaking or suction. The intermediate layer can be separated from another layer using a cryogenic spraying agent. The samples should be kept at 21°C ± 2°C and 50% ± 20% RH for at least 24 hours to reach equilibrium;

[0077] c. Use the above-mentioned instrument device, connect the power supply 104, hang the tray 110 on the L-shaped connecting rod 103, and adjust the counterweight 111 to detect the sensitivity of the device and determine whether the pointer is at the zero position;

[0078] d. Hang one of the intermediate layer specimens between the vertical reference plate 101 and the pressure foot 102;

[0079] e. Place the weight 113 on the tray 110;

[0080] f. Rotate the screw rod 106 so that the pressure foot 102 slowly moves to the left until the light bulb 105 lights up;

[0081] g. After timing for 10S with a stopwatch, read the scale value on the scale 107, expressed in millimeters (mm), accurate to 0.1 mm;

[0082] h. Repeat the above steps for the remaining 9 intermediate layer specimens, and calculate and record the average thickness. Calculate the grammage of each sample by dividing the weight of each specimen by their area;

[0083] i. Calculate the density (in g / cm 2 ) by dividing the grammage of the intermediate layer specimen (in g / cm 3 ) by the thickness (in cm).

[0084] Although the present utility model has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present utility model in terms of form and details without departing from the spirit and scope of the present utility model defined by the appended claims, and all such changes are within the protection scope of the present utility model.

Claims

1. A highly diffusible absorbent core, characterized in that: It includes a core body. The longitudinal direction is defined as extending along the length direction of the core body, and the transverse direction is defined as extending along the width direction of the core body. The core body includes a liquid-permeable upper cover layer, a lower cover layer, and an intermediate layer sandwiched between the upper cover layer and the lower cover layer. The average grammage of the intermediate layer is 5 g / m 2 ~350 g / m 2 . The intermediate layer has a front edge and a rear edge at both longitudinal ends, and two side edges extending in the longitudinal direction. The intermediate layer has a reference plane parallel to the horizontal plane formed by the front edge, the rear edge, and the side edges. The reference plane of the intermediate layer is recessed downward with a plurality of upper accommodation grooves, and each of the upper accommodation grooves is arranged in a row. The reference plane of the intermediate layer is recessed upward with a plurality of lower accommodation grooves, and each of the lower accommodation grooves is arranged in a row. Each row of the upper accommodation grooves and each row of the lower accommodation grooves are alternately arranged at intervals in the longitudinal direction. Moreover, the intermediate layer has a density of less than 0.64 g / cm 3 measured under a pressure of 5.4 kPa. The angle between the connection line of the upper accommodation grooves in the same row or the connection line of the lower accommodation grooves in the same row and the longitudinal central axis of the intermediate layer is 5°-75°. Both the upper accommodation grooves and the lower accommodation grooves are filled with superabsorbent polymer particles. The orthographic projection area of the upper accommodation grooves and the lower accommodation grooves is 0.1 cm 2 ~10 cm 2 . The grammage of the superabsorbent polymer particles in the intermediate layer is 0.01 g / m 2 ~1000 g / m 2 ; The intermediate layer includes at least one diversion groove extending in the longitudinal direction and not containing superabsorbent resin particles. The upper covering layer and the lower covering layer are adhesively attached to the upper surface and the lower surface of the intermediate layer respectively.

2. The highly diffusible absorbent core according to claim 1, wherein: The water absorption capacity of the core body increases step by step from one longitudinal end of the core body to the other longitudinal end and then decreases step by step.

3. The highly diffusible absorbent core according to claim 2, wherein: The density of the superabsorbent resin particles in the upper accommodation groove decreases step by step from the longitudinal middle part of the intermediate layer to the longitudinal two ends.

4. The highly diffusible absorbent core according to claim 1, characterized in that: Buffer cavities are provided by folding the transverse two sides of the upper covering layer and / or the lower covering layer.

5. The highly diffusible absorbent core according to any one of claims 1 to 4, characterized in that: The upper covering layer and / or the lower covering layer are further bonded to the intermediate layer in the diversion groove by one of adhesive bonding, mechanical bonding, ultrasonic bonding, pressure bonding or thermal bonding.

6. The highly diffusible absorbent core according to claim 5, characterized in that: The diversion groove is surrounded by at least one area of the intermediate layer including superabsorbent resin particles, or the diversion groove extends from the front edge to the rear edge of the intermediate layer.

7. The highly diffusible absorbent core according to claim 6, wherein: The ratio of the longitudinal length dimension of the diversion groove to the longitudinal length dimension of the absorbent core body is 0.02 - 1:

1.

8. The highly diffusible absorbent core according to claim 5, wherein: The diversion groove is spaced apart from the side edges extending in the longitudinal direction of the core body.

9. The highly diffusible absorbent core according to claim 8, wherein: There are two diversion grooves, and they are in an arc structure. The two diversion grooves are symmetrically distributed along the transverse central axis of the core body.

10. The highly diffusible absorbent core according to any one of claims 1 to 4, characterized in that: The upper covering layer and / or the lower covering layer are further bonded to the intermediate layer at the front edge, the rear edge and the side edge by one of adhesive bonding, mechanical bonding, ultrasonic bonding, pressure bonding or thermal bonding.

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