CN109620546B

CN109620546B - Water-absorbing core body and preparation method and application thereof

Info

Publication number: CN109620546B
Application number: CN201910079761.3A
Authority: CN
Inventors: 陈建辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-01-28
Filing date: 2019-01-28
Publication date: 2021-10-01
Anticipated expiration: 2039-01-28
Also published as: CN109620546A

Abstract

The invention relates to a water-absorbing core body and a preparation method and application thereof. The preparation method of the water absorption core body comprises the following steps: loosening and carding chemical fibers, and then laying the chemical fibers on a first flow guide layer obtained by molding a first mixed material to form a fluffy cotton layer to obtain a first laminated piece; carrying out hot air penetration and shaping on the first laminated piece, and then paving high-molecular water-absorbent resin powder on the fluffy cotton layer so as to disperse the high-molecular water-absorbent resin powder in the fluffy cotton layer, so that the high-molecular water-absorbent resin powder and the fluffy cotton layer form a water absorption layer together; forming a second mixed material, penetrating and forming by hot air to form a second flow guide layer, and laminating the second flow guide layer on the water absorption layer to obtain a second laminated member, wherein the first mixed material and the second mixed material both comprise fluff pulp and hot-melt fibers; and sequentially carrying out hot air penetration and shaping on the second laminated piece to obtain the water absorbing core body. The water absorption core body is not easy to layer after water absorption expansion, and has good water absorption effect and good water locking effect.

Description

Water-absorbing core body and preparation method and application thereof

Technical Field

The invention relates to the field of hygienic products, in particular to a water-absorbing core body and a preparation method and application thereof.

Background

In general, since a diaper, a sanitary napkin, or the like is required to have a good water absorbing property, it generally has a water absorbent core. At present, the production mode of the water-absorbing core body mainly comprises two modes, one mode is formed by mixing fluff pulp and macromolecule water-absorbing resin (SAP) on line, although the cost is low, the product is fast to diffuse, and the multiple absorption effect is good, but after the water-absorbing resin swells after absorbing water, the connection between the fluff pulp is poor, so that the fluff pulp is easy to break and cause the problem of lump generation, the use comfort degree is influenced, the effective use time is also influenced, in order to avoid the lump generation, a manufacturer reduces the using amount of the water-absorbing resin, but the water absorption amount and the use time of the product are reduced, and the absorption effect is not good. The other mode is that a fluffy non-woven fabric is adopted to fix SAP, thermosol composite bulked paper (or dust-free paper, non-woven fabric and the like) is respectively adopted on the upper surface and the lower surface, and the product is obtained after rolling and slitting.

Disclosure of Invention

Therefore, the preparation method of the water-absorbing core body which is not easy to delaminate after water absorption and expansion, has a good water absorption effect and a good water locking effect is needed.

In addition, a water-absorbing core body and application thereof are also provided.

A preparation method of a water-absorbing core body comprises the following steps:

forming a first mixed material to form a first flow guide layer, wherein the first mixed material comprises fluff pulp and hot-melt fibers;

loosening and carding chemical fibers, and then laying the chemical fibers on the first flow guide layer to form a fluffy cotton layer to obtain a first laminated piece;

carrying out hot air penetration shaping on the first laminated piece to obtain the shaped first laminated piece;

laying high-molecular water-absorbent resin powder on the fluffy cotton layer of the shaped first laminated piece so as to disperse the high-molecular water-absorbent resin powder in the fluffy cotton layer and enable the high-molecular water-absorbent resin powder and the fluffy cotton layer to form a water absorption layer together;

forming a second mixed material, and then carrying out hot air penetration and shaping to form a second flow guide layer, wherein the second mixed material comprises fluff pulp and hot-melt fibers;

laminating the second flow guide layer on the water absorbing layer to obtain a second laminated member; and

and carrying out hot air penetration and shaping on the second laminated piece to obtain the water absorbing core body.

In one embodiment, in the step of hot air through-air shaping the first laminate, the temperature is 60-200 ℃;

and/or in the step of carrying out hot air penetration shaping on the second laminated piece, the temperature is 60-200 ℃;

and/or, according to the mass percentage content, the first mixed material comprises 50-99% of fluff pulp and 1-50% of hot-melt fiber;

and/or, according to the mass percentage content, the second mixed material comprises 50-99% of fluff pulp and 1-50% of hot-melt fiber.

In one embodiment, the step of through-air-sizing the second laminate further comprises cooling by suction cooling.

In one embodiment, the step of through-air-setting the second laminate further comprises cooling the second laminate after the step of cooling the second laminate to a relative humidity of 3% RH to 10% RH.

In one embodiment, the step of cooling further comprises, after the step of cooling, a step of hot-pressing the second laminate to form a relief structure on the second laminate.

In one embodiment, before the step of through-air-setting the second laminate, the method further comprises the step of alternately forming the water-absorbing layer and the third flow-guiding layer on the second flow-guiding layer, wherein the material of the third flow-guiding layer comprises fluff pulp and hot-melt fibers.

In one embodiment, the step of forming the third current guiding layer comprises: forming the material of the third flow guide layer, and then carrying out hot air penetration and shaping to form the third flow guide layer;

or, the step of forming the third current guiding layer includes: and laying the material of the third diversion layer on the water absorption layer to form the third diversion layer.

In one embodiment, the chemical fiber comprises polyester fiber, polypropylene fiber and polyethylene fiber, and the mass percentage of the polyester fiber in the chemical fiber is 1-95%;

and/or the length of the fibers of the fluffy cotton layer is 38-64 mm, and the specification of the fluffy cotton layer is 1-35D;

and/or the fluff pulp is wood pulp or straw pulp;

and/or the hot melt fiber comprises polypropylene fiber and polyethylene fiber;

and/or after the step of performing through-air hot-air setting on the second laminated piece, the step of cutting the second laminated piece is further included, and the cutting method is hot-press cutting or ultrasonic cutting;

and/or the method for molding the first mixed material is airflow molding;

and/or the method for forming the second mixed material is airflow forming.

The water-absorbing core body is prepared by the preparation method of the water-absorbing core body.

The water-absorbing core body is applied to the preparation of paper diapers or sanitary towels.

The preparation method of the water absorbent core comprises the steps of forming a first flow guide layer, paving a fluffy cotton layer on the first flow guide layer, after hot air penetration and shaping are carried out on an obtained first laminated piece, paving high-molecular water absorbent resin powder on the fluffy cotton layer of the first laminated piece to enable the high-molecular water absorbent resin powder to be dispersed in the fluffy cotton layer, so that the high-molecular water absorbent resin powder and the fluffy cotton layer form a water absorption layer together, laminating a second flow guide layer subjected to hot air penetration and shaping and the water absorption layer, namely the water absorption layer is positioned between the first flow guide layer and the second flow guide layer, so that a first mixed material forming the first flow guide layer and a second mixed material forming the second flow guide layer both comprise fluff pulp and hot melt fibers, and the first flow guide layer, the water absorption layer and the second flow guide layer are firmly connected together by melting the hot melt fibers in the first flow guide layer and the second flow guide layer when the second laminated piece is subjected to hot air penetration and shaping, the high-molecular water-absorbent resin powder can be firmly fixed in the water-absorbing layer, and the layering problem caused by water absorption and expansion of the high-molecular water-absorbent resin powder can be effectively avoided. Because the chemical fiber of the fluffy cotton layer is only pulled loose and carded and is not subjected to glue spraying treatment, the fluffy cotton layer has better softness and is fluffier, thereby better providing space for the expansion of the high polymer water-absorbent resin powder, ensuring the expansion space of the high polymer water-absorbent resin and leading the water-absorbent core prepared by the method to have better absorption effect.

Meanwhile, the high-molecular water-absorbing resin powder is laid on the fluffy cotton layer of the first laminated piece after being shaped by hot air penetration, the high-molecular water-absorbing resin powder is dispersed in the fluffy cotton layer, the second flow guide layer is formed by laminating the water absorbing layer after being shaped by hot air penetration, and fluff pulp is contained in the first flow guide layer and the second flow guide layer, so that the obtained water absorbing core body has higher water absorbing speed, the water absorbing speed is still higher after water is absorbed for one time, the water absorbing effect is better, the surface after water absorption is still dry and comfortable, the water locking effect is better, and the problems of side leakage, back leakage and the like can be effectively prevented.

Drawings

Fig. 1 is a flowchart of a method for producing a water absorbent core according to an embodiment.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, a method for manufacturing a water absorbent core according to an embodiment includes the steps of:

step S110: and forming the first mixed material to form a first flow guide layer.

Specifically, the first flow guiding layer is sheet-shaped. Wherein, the first mixed material comprises 50 to 99 percent of fluff pulp and 1 to 50 percent of hot melt fiber by mass percent.

Wherein, the fluff pulp is straw pulp or wood pulp, and is preferably wood pulp. Because the fiber in the straw pulp is shorter, the flow guide effect is poorer, and compared with the straw pulp, the fiber in the wood pulp is longer, and the flow guide effect is better.

Wherein the hot melt fiber comprises polypropylene fiber and polyethylene fiber. Specifically, in the hot-melt fibers, the mass ratio of the polypropylene fibers to the polyethylene fibers is (2-5) to (5-8).

Wherein, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 2D-3D.

In particular, the method of shaping the first mixed material is air-flow shaping (i.e. shaping by air flow). Specifically, before step S110, the method further includes a step of crushing the fluff pulp, and then mixing the fluff pulp with the hot-melt fibers to obtain a first mixed material. Further, after the step of crushing the fluff pulp and before the step of mixing the fluff pulp with the hot-melt fibers, the method also comprises the step of sieving the crushed fluff pulp with a sieve with the diameter of 2.5-8 mm, and the paper without white spots and white lumps and with uniform paper surface can be obtained by sieving the fluff pulp with the sieve with the diameter of 2.5-8 mm.

Step S120: and (3) loosening and carding the chemical fibers, and then laying the chemical fibers on the first flow guide layer to form a fluffy cotton layer to obtain a first laminated piece.

Chemical fiber draws the pine promptly and combs the back and directly lays on first water conservancy diversion layer, consequently, the chemical fiber on fluffy cotton layer has only passed through drawing the pine and has combed, and does not handle through spouting the glue to make fluffy cotton layer have better compliance, fluffy more, thereby provide the space for the inflation of polymer water absorbent resin powder better, guaranteed polymer water absorbent resin's inflation space.

Wherein the length of the fiber of the fluffy cotton layer is 38 mm-64 mm, and the specification is 1.5D-35D (wherein, the 1.5D-35D represents that the weight of 9000 meters of the fiber is 1.5 g-35 g).

Wherein the chemical fiber comprises polyester fiber, polypropylene fiber and polyethylene fiber; in the chemical fiber, the mass percentage of the polyester fiber is 1-99%.

Further, in the chemical fiber, the total mass percentage content of the polypropylene fiber and the polyethylene fiber is 1-99%.

Furthermore, in the chemical fiber, the mass ratio of the polypropylene fiber to the polyethylene fiber is (2-5) to (5-8).

Step S130: and carrying out hot air penetration shaping on the first laminated piece to obtain the shaped first laminated piece.

Specifically, in the step of carrying out hot air penetration shaping on the first laminated piece, the temperature is 60-200 ℃.

Step S140: and paving high-molecular water-absorbent resin powder (SAP) on the fluffy cotton layer of the shaped first laminated piece so as to disperse the high-molecular water-absorbent resin powder in the fluffy cotton layer and enable the high-molecular water-absorbent resin powder and the fluffy cotton layer to form a water-absorbing layer together.

Because the fluffy cotton layer is fluffy, when the macromolecular water-absorbent resin powder is laid on the fluffy cotton layer, the macromolecular water-absorbent resin powder can permeate into the fluffy cotton layer, so that the macromolecular water-absorbent resin powder and the fluffy cotton layer form a water-absorbent layer together, namely the water-absorbent layer is the fluffy cotton layer dispersed with the macromolecular water-absorbent resin.

Wherein the particle size of the high molecular water-absorbing resin is 50-900 μm. Too large or too small particle size affects the thickness of the water-absorbent core and the density of the water-absorbent polymer resin in the water-absorbent core.

Step S150: and forming the second mixed material, and then carrying out hot air penetration and forming to form a second flow guide layer.

Specifically, the second flow guiding layer is sheet-like. Wherein, the second mixed material comprises 50 to 99 percent of fluff pulp and 1 to 50 percent of hot melt fiber according to the mass percentage. Wherein, the fluff pulp is straw pulp or wood pulp, and is preferably wood pulp. Because the fiber in the straw pulp is shorter, the flow guide effect is poorer, and compared with the straw pulp, the fiber in the wood pulp is longer, and the flow guide effect is better. The hot melt fibers include polypropylene fibers and polyethylene fibers. Specifically, in the hot-melt fibers, the mass ratio of the polypropylene fibers to the polyethylene fibers is (2-5) to (5-8). The length of the hot melt fiber is 3 mm-8 mm, and the specification is 2D-3D.

Specifically, the preparation steps of the second mixed material are the same as those of the first mixed material. The content of the fluff pulp and the hot-melt fiber in the second mixed material can be the same as or different from that of the first mixed material.

Specifically, the second mixed material is molded, and then hot air penetration molding is carried out, wherein the temperature of the hot air penetration molding is 60-200 ℃.

Specifically, the method for molding the second mixed material is air molding.

Step S160: and laminating the second flow guide layer on the water absorbing layer to obtain a second laminated member.

Further, before the step of performing through-air fixing on the second laminate, the method further comprises the step of alternately forming a plurality of water-absorbing layers and a plurality of third flow-guiding layers on the second flow-guiding layers. Wherein, the material of the third flow guide layer comprises fluff pulp and hot melt fibers. Wherein, according to the mass percent, the material of third water conservancy diversion layer includes: 50 to 99 percent of fluff pulp and 1 to 50 percent of hot melt fiber. Specifically, fluff pulp and hot-melt fibers in the material of the third flow guide layer are respectively the same as the fluff pulp and the hot-melt fibers in the first mixed material, and the ratio of the fluff pulp to the hot-melt fibers in the material of the third flow guide layer may be the same as or different from the ratio of the fluff pulp to the hot-melt fibers in the first mixed material.

In one embodiment, the step of forming the third current guiding layer comprises: and forming the material of the third flow guide layer, and then carrying out hot air penetration and shaping to form the third flow guide layer. Specifically, the preparation step of the material of the third current guiding layer is the same as the preparation step of the first mixed material. The temperature of hot air penetration setting is 60-200 ℃.

In another embodiment, the step of forming the third current guiding layer comprises: and paving the material of the third flow guide layer on the water absorption layer to form the third flow guide layer. Namely, the material of the third diversion layer is directly paved on the water absorption layer without hot air penetration before paving. Specifically, the preparation step of the material of the third current guiding layer is the same as the preparation step of the first mixed material.

Step S170: and carrying out hot air penetration and shaping on the second laminated piece to obtain the water absorbing core body.

The flow-directing layer and the water-absorbing layer are joined together by through-air-setting the laminate to melt the hot melt fibers in the flow-directing layer.

Specifically, in the step of performing through-air hot air setting on the second laminated piece, the temperature is 60-200 ℃.

Specifically, the step of through-air-fixing the second laminated member further comprises a cooling step, wherein the cooling method is air draft cooling, so that the humidity of the second laminated member is adjusted while the fixed second laminated member is cooled.

Specifically, the relative humidity of the second laminate after the step of cooling is between 3% RH and 10% RH.

Specifically, after the step of through-air-setting the second laminate, the step of cutting the second laminate is further included. Wherein the step of cutting follows the step of cooling. The method of the cutting process may be a cutting process commonly used in the art. Preferably, the cutting process is performed by hot press cutting or ultrasonic cutting. By adopting the hot-pressing cutting and ultrasonic cutting methods, the hot-melt fibers in the first flow guide layer and the hot-melt fibers in the second flow guide layer at the cutting position can be fused together during cutting, and the connection between the first flow guide layer and the second flow guide layer is further increased, so that the first flow guide layer and the second flow guide layer have better connectivity and simultaneously play a role in edge sealing. More preferably, the method of the cutting process is a hot press cutting, which has a faster cutting speed.

Specifically, the technological parameters of ultrasonic cutting are as follows: the cutting speed is 80 m/min-250 m/min, and the ultrasonic frequency is above 20000 Hz. The cutting speed is matched with the ultrasonic frequency, so that the cutting quality and the better edge sealing effect can be ensured.

Specifically, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 1 m/min to 350 m/min. The cutting speed is matched with the ultrasonic frequency, so that the cutting quality and the better edge sealing effect can be ensured. The temperature of hot pressing cutting is 80-250 ℃.

Further, the step of cooling may be followed by a step of hot-pressing the second laminate to form a relief structure on the second laminate. Wherein the step of hot pressing the second laminate precedes the step of cutting. Specifically, the hot pressing pressure is 0.3MPa to 10MPa, and the hot pressing temperature is 80 ℃ to 250 ℃.

Specifically, the water absorption core body comprises the following components in percentage by mass: 4 to 10 percent of chemical fiber (namely the chemical fiber forming the fluffy cotton layer), 13 to 30 percent of fluff pulp (the total content of the fluff pulp of all the flow guide layers), 62 to 70 percent of high molecular water-absorbing resin powder (the high molecular water-absorbing resin powder in all the water-absorbing layers) and 2 to 12 percent of hot melt fiber (the total content of the hot melt fiber of all the flow guide layers).

The preparation method of the water absorption core body has at least the following advantages:

(1) the preparation method of the water absorbent core comprises the steps of forming a first flow guide layer, paving a fluffy cotton layer on the first flow guide layer, after hot air penetration and shaping are carried out on an obtained first laminated piece, paving high-molecular water absorbent resin powder on the fluffy cotton layer of the first laminated piece to enable the high-molecular water absorbent resin powder to be dispersed in the fluffy cotton layer, so that the high-molecular water absorbent resin powder and the fluffy cotton layer form a water absorption layer together, laminating a second flow guide layer subjected to hot air penetration and shaping and the water absorption layer, namely the water absorption layer is positioned between the first flow guide layer and the second flow guide layer, so that a first mixed material forming the first flow guide layer and a second mixed material forming the second flow guide layer both comprise fluff pulp and hot melt fibers, and the first flow guide layer, the water absorption layer and the second flow guide layer are firmly connected together by melting the hot melt fibers in the first flow guide layer and the second flow guide layer when the second laminated piece is subjected to hot air penetration and shaping, the high-molecular water-absorbent resin powder can be firmly fixed in the water-absorbing layer, and the layering problem caused by water absorption and expansion of the high-molecular water-absorbent resin powder can be effectively avoided. Because the chemical fiber of the fluffy cotton layer is only pulled loose and carded and is not subjected to glue spraying treatment, the fluffy cotton layer has better softness and is fluffier, thereby better providing space for the expansion of the high polymer water-absorbent resin powder, ensuring the expansion space of the high polymer water-absorbent resin and leading the water-absorbent core prepared by the method to have better absorption effect.

(2) The fluff pulp and the hot melt fiber in the first flow guide layer, the second flow guide layer and the third flow guide layer are proportioned according to the content, so that each flow guide layer has a good flow guide effect, all the layers of the water absorption core body can be stably connected together, and the good connectivity of all the layers of the water absorption core body is guaranteed.

(3) By cutting with a hot-pressing cutting or ultrasonic cutting method, cutting is achieved, meanwhile, hot melt fibers in the first flow guide layer and hot melt fibers in the second flow guide layer at the cutting position can be fused, connection between the first flow guide layer and the second flow guide layer is further increased, the first flow guide layer and the second flow guide layer have good connectivity, and meanwhile, edge sealing is achieved.

(4) And the chemical fiber forming the fluffy cotton layer of the water-absorbing core body comprises polypropylene fiber and polyethylene fiber, so that the water-absorbing layer of the second laminated member can be better fused with the first flow guide layer and the second flow guide layer in the hot air penetration process, and the connectivity of the whole water-absorbing core body is further improved.

(5) Through carrying out hot-blast penetration design with the second folded piece, then after the step of cooling, carry out hot pressing to the second folded piece before the step of cutting processing again to make one side of second folded piece form concave-convex structure, thereby the absorbent core has better diffusivity, increases the area of absorbing water and reduces the area of contact with the skin, with the diffusion absorption of improving the absorbent core, thereby can prevent problems such as edge leakage, back leak more effectively.

The water absorbent core of an embodiment is produced by the above method for producing a water absorbent core. The water-absorbent resin of the water-absorbent core body is not easy to delaminate after being expanded, and has good water absorption effect and good water locking effect.

The water-absorbing core body can be used for preparing paper diapers or sanitary towels. For example, when the core of a paper diaper or a sanitary napkin is used, the absorbent core has a good absorption effect, and the high-molecular absorbent resin is not easy to delaminate after being expanded, has a good water locking effect and is dry and comfortable, so that the paper diaper or the sanitary napkin adopting the absorbent core as the core has a good absorption effect, and is not easy to cause the problems of side leakage and back leakage.

The following are specific examples (the following examples, unless otherwise specified, contain no other components not specifically indicated except for unavoidable impurities):

example 1

The preparation process of the water absorbent core of the embodiment is as follows:

(1) the fluff pulp is crushed and sieved by a sieve with the diameter of 5mm, and then the fluff pulp and the hot melt fiber are mixed according to the mass percentage of 80 percent to 20 percent to obtain a first mixed material. And carrying out air pressure forming on the first mixed material to obtain a first flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 4:6, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 3D.

(2) Vibrating chemical fibers in a bale opener, conveying the chemical fibers into an opener by wind for loosening, conveying the loosened chemical fibers into a last cotton box by wind for storage, conveying the chemical fibers into an automatic cotton box by wind for quantification, carding the cotton in a carding machine to form fluffy cotton, laying the fluffy cotton on a first flow guide layer to form a fluffy cotton layer, and obtaining a first laminated piece, wherein the chemical fibers are a mixture of polyester fibers, polypropylene fibers and polyethylene fibers, the chemical fibers comprise 50% of the polyester fibers, the total mass percentage of the polypropylene fibers and the polyethylene fibers is 50%, the mass ratio of the polypropylene fibers to the polyethylene fibers is 4:6, the length of the fibers of the fluffy cotton layer is 60-64 mm, and the specification is 20D.

(3) And (3) carrying out hot air penetration shaping on the first laminated piece at 120 ℃ to obtain the shaped first laminated piece.

(4) And (3) paving the high-molecular water-absorbent resin powder with the granularity of 200 mu m on the fluffy cotton layer of the shaped first laminated piece so as to disperse the high-molecular water-absorbent resin powder in the fluffy cotton layer and enable the high-molecular water-absorbent resin powder and the fluffy cotton layer to form a water absorption layer together.

(5) And (2) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 5mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 80 to 20 percent to obtain a second mixed material. And carrying out air pressure forming on the second mixed material, and then carrying out hot air penetration forming at 120 ℃ to form a second flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 4:6, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 3D.

(6) And laminating the second flow guide layer on the water absorbing layer to obtain a second laminated member.

(7) And (3) enabling hot wind in a hot box at 130 ℃ to penetrate and shape the second laminated piece, then conducting air draft cooling on the shaped second laminated piece, enabling the relative humidity of the second laminated piece to be 8% RH, then conducting hot pressing on the second laminated piece through a hot pressing roller with salient points under the conditions that the pressure is 0.5MPa and the temperature is 140 ℃ to form a concave-convex structure on the second laminated piece, and then cutting the second laminated piece through hot pressing by using a hot pressing splitting machine to obtain the water absorbing core body.

Wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 180 m/min, and the temperature is 140 ℃; according to the mass percentage, the whole water-absorbing core body consists of 10% of chemical fibers (namely the chemical fibers of fluffy cotton forming the water-absorbing layer), 16% of fluff pulp (the total content of the fluff pulp of the first flow guide layer and the second flow guide layer), 70% of high-molecular water-absorbing resin powder and 4% of hot-melt fibers (the total content of the hot-melt fibers of the first flow guide layer and the second flow guide layer).

Example 2

(1) the fluff pulp is crushed and sieved by a sieve with the diameter of 2.5 mm, and then the fluff pulp and the hot melt fiber are mixed according to the mass percentage of 64.7 percent to 35.3 percent to obtain a first mixed material. And carrying out air pressure forming on the first mixed material to obtain a first flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 2:5, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 2D.

(2) Vibrating chemical fibers in a bale opener, conveying the chemical fibers into an opener by wind for loosening, conveying the loosened chemical fibers into a last cotton box by wind for storage, conveying the chemical fibers into an automatic cotton box by wind for quantification, carding the cotton in a carding machine to form fluffy cotton, laying the fluffy cotton on a first flow guide layer to form a fluffy cotton layer, and obtaining a first laminated piece, wherein the chemical fibers are polyester fibers, polypropylene fibers and polyethylene fibers, the mass percentage of the polyester fibers is 70%, the total mass percentage of the polypropylene fibers and the polyethylene fibers is 30%, the mass ratio of the polypropylene fibers to the polyethylene fibers is 2:5, the length of the fibers of the fluffy cotton layer is 38-40 mm, and the specification is 1.5D.

(3) And (3) carrying out hot air penetration shaping on the first laminated piece at the temperature of 60 ℃ to obtain the shaped first laminated piece.

(4) And (3) paving high-molecular water-absorbent resin powder with the granularity of 80 mu m on the fluffy cotton layer of the shaped first laminated piece so as to disperse the high-molecular water-absorbent resin powder in the fluffy cotton layer and enable the high-molecular water-absorbent resin powder and the fluffy cotton layer to form a water-absorbent layer together.

(5) And (2) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 2.5 mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 64.7 to 35.3 percent to obtain a second mixed material. And carrying out air pressure forming on the second mixed material, and then carrying out hot air penetration forming at 60 ℃ to form a second flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 2:5, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 2D.

(7) And (3) enabling hot wind in a hot box at 60 ℃ to penetrate and shape the second laminated piece, then conducting air draft cooling on the shaped second laminated piece, enabling the relative humidity of the second laminated piece to be 3% RH, then conducting hot pressing on the second laminated piece through a hot pressing roller with salient points under the conditions that the pressure is 0.3MPa and the temperature is 250 ℃ to form a concave-convex structure on the second laminated piece, and then cutting the second laminated piece through hot pressing by using a hot pressing splitting machine to obtain the water absorbing core body.

Wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 1 m/min, and the temperature is 100 ℃; according to the mass percentage, the whole water absorption core body consists of 4% of chemical fiber (namely the chemical fiber of fluffy cotton forming the water absorption layer), 22% of fluff pulp (the total content of the fluff pulp of the first flow guide layer and the second flow guide layer), 62% of high polymer water-absorbent resin powder and 12% of hot melt fiber (the total content of the hot melt fiber of the first flow guide layer and the second flow guide layer).

Example 3

(1) the fluff pulp is crushed and sieved by a sieve with the diameter of 8mm, and then the fluff pulp and the hot-melt fibers are mixed according to the mass percentage of 91.5 percent to 8.5 percent to obtain a first mixed material. And carrying out air pressure forming on the first mixed material to obtain a first flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 5:5, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 3D.

(2) Vibrating chemical fibers in a bale opener, conveying the chemical fibers into an opener by wind for loosening, conveying the loosened chemical fibers into a last cotton box by wind for storage, conveying the chemical fibers into an automatic cotton box by wind for quantification, carding the cotton in a carding machine to form fluffy cotton, laying the fluffy cotton on a first flow guide layer to form a fluffy cotton layer, and obtaining a first laminated piece, wherein the chemical fibers are polyester fibers, polypropylene fibers and polyethylene fibers, the mass percentage of the polyester fibers is 1%, the total mass percentage of the polypropylene fibers and the polyethylene fibers is 99%, the mass ratio of the polypropylene fibers to the polyethylene fibers is 5:5, the length of the fibers of the fluffy cotton layer is 50-54 mm, and the specification is 35D.

(3) And (3) carrying out hot air penetration shaping on the first laminated piece at the temperature of 130 ℃ to obtain the shaped first laminated piece.

(4) And (3) paving high-molecular water-absorbent resin powder with the granularity of 300 mu m on the fluffy cotton layer of the shaped first laminated piece so as to disperse the high-molecular water-absorbent resin powder in the fluffy cotton layer and enable the high-molecular water-absorbent resin powder and the fluffy cotton layer to form a water-absorbent layer together.

(5) And (2) crushing the fluff pulp, sieving the fluff pulp by using a sieve with the diameter of 8mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 99% to 1% to obtain a second mixed material. And carrying out air pressure forming on the second mixed material, and then carrying out hot air penetration forming at 130 ℃ to form a second flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 5:5, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 3D.

(7) And (2) enabling hot wind in a hot box at 150 ℃ to penetrate and shape the second laminated piece, then conducting air draft cooling on the shaped second laminated piece, enabling the relative humidity of the second laminated piece to be 8% RH, then conducting hot pressing on the second laminated piece through a hot pressing roller with bumps under the conditions that the pressure is 1MPa and the temperature is 80 ℃ to form a concave-convex structure on the second laminated piece, and then cutting the second laminated piece through a hot pressing splitting machine to obtain the water-absorbing core body.

Wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 350 m/min, and the temperature is 180 ℃; according to the mass percentage, the whole water-absorbing core body consists of 5% of chemical fibers (namely the chemical fibers of fluffy cotton forming the water-absorbing layer), 30% of fluff pulp (the total content of the fluff pulp of the first flow guide layer and the second flow guide layer), 63% of high-molecular water-absorbing resin powder and 2% of hot-melt fibers (the total content of the hot-melt fibers of the first flow guide layer and the second flow guide layer).

Example 4

(1) the fluff pulp is crushed and sieved by a sieve with the diameter of 4mm, and then the fluff pulp and the hot-melt fibers are mixed according to the mass percentage of 50 percent to obtain a first mixed material. And carrying out air pressure forming on the first mixed material to obtain a first flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 2:8, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 2D.

(2) Vibrating chemical fibers in a bale opener, conveying the chemical fibers into an opener by wind for loosening, conveying the loosened chemical fibers into a last cotton box by wind for storage, conveying the chemical fibers into an automatic cotton box by wind for quantification, carding the cotton in a carding machine to form fluffy cotton, laying the fluffy cotton on a first flow guide layer to form a fluffy cotton layer, and obtaining a first laminated piece, wherein the chemical fibers are polyester fibers, polypropylene fibers and polyethylene fibers, the mass percentage of the polyester fibers is 99%, the total mass percentage of the polypropylene fibers and the polyethylene fibers is 1%, the mass ratio of the polypropylene fibers to the polyethylene fibers is 2:8, the length of the fibers of the fluffy cotton layer is 60-64 mm, and the specification is 30D.

(3) And (3) carrying out hot air penetration shaping on the first laminated piece at the temperature of 100 ℃ to obtain the shaped first laminated piece.

(4) And (3) paving high-molecular water-absorbent resin powder with the granularity of 50 mu m on the fluffy cotton layer of the shaped first laminated piece so as to disperse the high-molecular water-absorbent resin powder in the fluffy cotton layer and enable the high-molecular water-absorbent resin powder and the fluffy cotton layer to form a water-absorbent layer together.

(5) And (2) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 4mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 80 to 20 percent to obtain a second mixed material. And carrying out air pressure forming on the second mixed material, and then carrying out hot air penetration forming at 150 ℃ to form a second flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 2:8, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 2D.

(7) And hot wind penetrates the second laminated member in a hot box at 200 ℃ for shaping, then the shaped second laminated member is subjected to air draft cooling, the relative humidity of the second laminated member is 6% RH, then under the conditions that the pressure is 2MPa and the temperature is 180 ℃, the second laminated member is subjected to hot pressing by a hot pressing roller with salient points, so that a concave-convex structure is formed on the second laminated member, and then the second laminated member is subjected to hot pressing and cutting by a hot pressing and splitting machine, so that the water-absorbing core body is obtained.

Wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 100 m/min, and the temperature is 80 ℃; according to the mass percentage, the whole water-absorbing core body consists of 10% of chemical fibers (namely the chemical fibers of fluffy cotton forming the water-absorbing layer), 13% of fluff pulp (the total content of the fluff pulp of the first flow guide layer and the second flow guide layer), 70% of high-molecular water-absorbing resin powder and 7% of hot-melt fibers (the total content of the hot-melt fibers of the first flow guide layer and the second flow guide layer).

Example 5

(1) the fluff pulp is crushed and sieved by a sieve with the diameter of 6 mm, and then the fluff pulp and the hot-melt fibers are mixed according to the mass percentage of 99 percent to 1 percent to obtain a first mixed material. And carrying out air pressure forming on the first mixed material to obtain a first flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 3:7, the length of the hot melt fiber is 3-8 mm, and the specification is 2D.

(2) Vibrating chemical fibers in a bale opener, conveying the chemical fibers into an opener by wind for loosening, conveying the loosened chemical fibers into a last cotton box by wind for storage, conveying the chemical fibers into an automatic cotton box by wind for quantification, carding the cotton in a carding machine to form fluffy cotton, laying the fluffy cotton on a first flow guide layer to form a fluffy cotton layer, and obtaining a first laminated piece, wherein the chemical fibers are polyester fibers, polypropylene fibers and polyethylene fibers, the mass percentage of the polyester fibers is 30%, the total mass percentage of the polypropylene fibers and the polyethylene fibers is 70%, the mass ratio of the polypropylene fibers to the polyethylene fibers is 3:7, the length of the fluffy cotton fibers is 60-64 mm, and the specification is 30D.

(3) And (3) carrying out hot air penetration shaping on the first laminated piece at 180 ℃ to obtain the shaped first laminated piece.

(4) And paving high-molecular water-absorbent resin powder with the granularity of 600 mu m on the fluffy cotton layer of the shaped first laminated piece so as to disperse the high-molecular water-absorbent resin powder in the fluffy cotton layer and enable the high-molecular water-absorbent resin powder and the fluffy cotton layer to form a water-absorbent layer together.

(5) And (2) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 6 mm, and mixing the fluff pulp with the hot-melt fibers according to the mass percent of 61% to 39% to obtain a second mixed material. And carrying out air pressure forming on the second mixed material, and then carrying out hot air penetration forming at 200 ℃ to form a second flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 3:7, the length of the hot melt fiber is 3-8 mm, and the specification is 2D.

(7) And (3) enabling hot wind in a hot box at 160 ℃ to penetrate and shape the second laminated piece, then conducting air draft cooling on the shaped second laminated piece, enabling the relative humidity of the second laminated piece to be 9% RH, then conducting hot pressing on the second laminated piece through a hot pressing roller with bumps under the conditions that the pressure is 10MPa and the temperature is 200 ℃ to form a concave-convex structure on the second laminated piece, and then cutting the second laminated piece through a hot pressing splitting machine to obtain the water-absorbing core body.

Wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 200 m/min, and the temperature is 250 ℃; the whole water-absorbing core body consists of 7% of chemical fibers (namely the chemical fibers of fluffy cotton forming the water-absorbing layer), 20% of fluff pulp (the total content of the fluff pulp of the first flow guide layer and the second flow guide layer), 68% of high-molecular water-absorbing resin powder and 5% of hot-melt fibers (the total content of the hot-melt fibers of the first flow guide layer and the second flow guide layer) by mass percentage.

Example 6

(1) the fluff pulp is crushed and sieved by a sieve with the diameter of 5mm, and then the fluff pulp and the hot-melt fibers are mixed according to the mass percentage of 70 percent to 30 percent to obtain a first mixed material. And carrying out air pressure forming on the first mixed material to obtain a first flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 4:6, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 2D.

(2) Vibrating chemical fibers in a bale opener, conveying the chemical fibers into an opener by wind for loosening, conveying the loosened chemical fibers into a last cotton box by wind for storage, conveying the chemical fibers into an automatic cotton box by wind for quantification, carding the cotton in a carding machine to form fluffy cotton, laying the fluffy cotton on a first flow guide layer to form a fluffy cotton layer, and obtaining a first laminated piece, wherein the chemical fibers are polyester fibers, polypropylene fibers and polyethylene fibers, the mass percentage of the polyester fibers is 60%, the total mass percentage of the polypropylene fibers and the polyethylene fibers is 40%, the mass ratio of the polypropylene fibers to the polyethylene fibers is 4:6, the length of the fibers of the fluffy cotton layer is 60-64 mm, and the specification is 30D.

(3) And (3) carrying out hot air penetration shaping on the first laminated piece at the temperature of 200 ℃ to obtain the shaped first laminated piece.

(4) And laying high-molecular water-absorbent resin powder with the granularity of 900 mu m on the fluffy cotton layer of the shaped first laminated piece so as to disperse the high-molecular water-absorbent resin powder in the fluffy cotton layer and enable the high-molecular water-absorbent resin powder and the fluffy cotton layer to form a water absorption layer together.

(5) And (2) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 5mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 50% to obtain a second mixed material. And carrying out air pressure forming on the second mixed material, and then carrying out hot air penetration forming at 180 ℃ to form a second flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 4:6, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 2D.

(7) And (2) enabling hot wind in a hot box at 140 ℃ to penetrate and shape the second laminated piece, then conducting air draft cooling on the shaped second laminated piece, enabling the relative humidity of the second laminated piece to be 10% RH, then conducting hot pressing on the second laminated piece through a hot pressing roller with salient points under the conditions that the pressure is 5MPa and the temperature is 160 ℃, so as to form a concave-convex structure on the second laminated piece, and then cutting the second laminated piece through hot pressing by using a hot pressing splitting machine to obtain the water absorbing core body.

Wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 150 m/min, and the temperature is 200 ℃; according to the mass percentage, the whole water-absorbing core body consists of 8% of chemical fibers (namely the chemical fibers of fluffy cotton forming the water-absorbing layer), 15% of fluff pulp (the total content of the fluff pulp of the first flow guide layer and the second flow guide layer), 67% of high-molecular water-absorbing resin powder and 10% of hot-melt fibers (the total content of the hot-melt fibers of the first flow guide layer and the second flow guide layer).

Example 7

(2) Vibrating chemical fibers in a bale opener, conveying the chemical fibers into an opener by wind for loosening, conveying the loosened chemical fibers into a last cotton box by wind for storage, conveying the chemical fibers into an automatic cotton box by wind for quantification, carding the cotton in a carding machine to form fluffy cotton, laying the fluffy cotton on a first flow guide layer to form a first fluffy cotton layer, and obtaining a first laminated piece, wherein the chemical fibers are polyester fibers, polypropylene fibers and polyethylene fibers, the mass percentage of the polyester fibers is 60%, the total mass percentage of the polypropylene fibers and the polyethylene fibers is 40%, the mass ratio of the polypropylene fibers to the polyethylene fibers is 4:6, the length of the fibers of the fluffy cotton layer is 60-64 mm, and the specification is 20D.

(4) And paving the high molecular water-absorbent resin powder with the granularity of 100 mu m on the first fluffy cotton layer of the shaped first laminated piece so as to disperse the high molecular water-absorbent resin powder in the first fluffy cotton layer and enable the high molecular water-absorbent resin powder and the fluffy cotton layer to form a first water-absorbing layer together.

(6) And laminating the second diversion layer on the first water absorption layer.

(7) And (3) forming a second fluffy cotton layer on the second flow guide layer by adopting the same method for forming the first fluffy cotton layer in the step (2), and then paving the high molecular water-absorbent resin powder with the granularity of 300 mu m on the fluffy cotton layer so as to disperse the high molecular water-absorbent resin powder in the second fluffy cotton layer, so that the high molecular water-absorbent resin powder and the second fluffy cotton layer form a second water-absorbent layer together.

(8) And (3) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 5mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 80 to 20 percent to obtain a third mixed material. Carrying out air pressure forming on the third mixed material, and then carrying out hot air penetration forming at 120 ℃ to form a third flow guide layer, wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 4:6, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 3D.

(9) And laminating the third flow guide layer on the second water absorption layer to obtain a second laminated member.

(10) Hot wind penetrates through the second laminated member in a hot box at 150 ℃ for shaping, then air draft cooling is carried out on the shaped second laminated member, the relative humidity of the second laminated member is 8% RH, then hot pressing is carried out on the second laminated member through a hot pressing roller with salient points under the conditions that the pressure is 1MPa and the temperature is 80 ℃, so that a concave-convex structure is formed on the second laminated member, and then the second laminated member is hot pressed and cut by a hot pressing and cutting machine, so that the water absorption core body is obtained;

wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 300 m/min, and the temperature is 160 ℃; according to the mass percentage, the whole water-absorbing core body consists of 8% of chemical fibers (namely the chemical fibers in the fluffy cotton forming the two water-absorbing layers), 24% of fluff pulp (the total content of the fluff pulp of the first flow guide layer, the second flow guide layer and the third flow guide layer), 62% of high polymer water-absorbing resin powder (the total content of the high polymer water-absorbing resin powder of the two water-absorbing layers) and 6% of hot-melt fibers (the total content of the hot-melt fibers of the first flow guide layer, the second flow guide layer and the third flow guide layer).

Example 8

(1) the fluff pulp is crushed and sieved by a sieve with the diameter of 2.5 mm, and then the fluff pulp and the hot-melt fibers are mixed according to the mass percentage of 70 percent to 30 percent to obtain a first mixed material. And carrying out air pressure forming on the first mixed material to obtain a first flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 5:5, the length of the hot melt fiber is 3-8 mm, and the specification is 2D.

(2) Vibrating chemical fibers in a bale opener, conveying the chemical fibers into an opener by wind for loosening, conveying the loosened chemical fibers into a last cotton box by wind for storage, conveying the chemical fibers into an automatic cotton box by wind for quantification, carding the cotton in a carding machine to form fluffy cotton, laying the fluffy cotton on a first flow guide layer to form a first fluffy cotton layer, and obtaining a first laminated piece, wherein the chemical fibers are polyester fibers, polypropylene fibers and polyethylene fibers, the mass percentage of the polyester fibers is 60%, the total mass percentage of the polypropylene fibers and the polyethylene fibers is 40%, the mass ratio of the polypropylene fibers to the polyethylene fibers is 5:5, the length of the fibers of the fluffy cotton layer is 38-64 mm, and the specification is 35D.

(3) And (3) carrying out hot air penetration shaping on the first laminated piece at the temperature of 140 ℃ to obtain the shaped first laminated piece.

(4) And (3) paving high-molecular water-absorbent resin powder with the granularity of 500 mu m on the first fluffy cotton layer of the shaped first laminated piece so as to disperse the high-molecular water-absorbent resin powder in the first fluffy cotton layer and enable the high-molecular water-absorbent resin powder and the fluffy cotton layer to form a first water-absorbent layer together.

(5) And (2) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 2.5 mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 70 to 30 percent to obtain a second mixed material. And carrying out air pressure forming on the second mixed material, and then carrying out hot air penetration forming at 140 ℃ to form a second flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 5:5, the length of the hot melt fiber is 3-8 mm, and the specification is 2D.

(7) And (3) forming a second fluffy cotton layer on the second flow guide layer by adopting the same method for forming the first fluffy cotton layer in the step (2), and then paving high-molecular water-absorbent resin powder with the granularity of 500 mu m on the fluffy cotton layer so as to disperse the high-molecular water-absorbent resin powder in the second fluffy cotton layer, so that the high-molecular water-absorbent resin powder and the second fluffy cotton layer form a second water-absorbent layer together.

(8) And (3) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 2.5 mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 70 to 30 percent to obtain a third mixed material. Carrying out air pressure forming on the third mixed material, and then carrying out hot air penetration forming at 160 ℃ to form a third flow guide layer, wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 5:5, the length of the hot melt fiber is 3-8 mm, and the specification is 2D.

(9) And laminating the third diversion layer on the second water absorption layer.

(10) And (5) repeating the steps (7) to (9) to form a second third flow guide layer and a third water-absorbing layer on the second water-absorbing layer, thereby obtaining a second laminated member.

(11) Hot wind penetrates through the second laminated member in a hot box at 100 ℃ for shaping, then air draft cooling is carried out on the shaped second laminated member, the relative humidity of the second laminated member is 3% RH, then under the conditions that the pressure is 10MPa and the temperature is 250 ℃, hot pressing rollers with salient points carry out hot pressing on the second laminated member so as to form a concave-convex structure on the second laminated member, and then a hot pressing and cutting machine is used for cutting the second laminated member in a hot pressing mode to obtain the water absorbing core body;

wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 180 m/min, and the temperature is 160 ℃; according to the mass percentage, the whole water-absorbing core body consists of 10% of chemical fibers (namely the chemical fibers in the fluffy cotton forming the three water-absorbing layers), 14% of fluff pulp (the total content of the fluff pulp of the first flow guide layer, the second flow guide layer and the two third flow guide layers), 70% of high-molecular water-absorbing resin powder (the total content of the high-molecular water-absorbing resin powder of the three water-absorbing layers) and 6% of hot-melt fibers (the total content of the hot-melt fibers of the first flow guide layer, the second flow guide layer and the two third flow guide layers).

Example 9

(1) the fluff pulp is crushed and sieved by a sieve with the diameter of 8mm, and then the fluff pulp and the hot-melt fibers are mixed according to the mass percentage of 90 percent to 10 percent to obtain a first mixed material. And carrying out air pressure forming on the first mixed material to obtain a first flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 3:7, the length of the hot melt fiber is 3-8 mm, and the specification is 2D.

(2) Vibrating chemical fibers in a bale opener, conveying the chemical fibers into an opener by wind for loosening, conveying the loosened chemical fibers into a last cotton box by wind for storage, conveying the chemical fibers into an automatic cotton box by wind for quantification, carding the cotton in a carding machine to form fluffy cotton, laying the fluffy cotton on a first flow guide layer to form a fluffy cotton layer, and obtaining a first laminated piece, wherein the chemical fibers are polyester fibers, polypropylene fibers and polyethylene fibers, the mass percentage of the polyester fibers is 60%, the total mass percentage of the polypropylene fibers and the polyethylene fibers is 40%, the mass ratio of the polypropylene fibers to the polyethylene fibers is 3:7, the length of the fibers of the fluffy cotton layer is 50-64 mm, and the specification is 1D.

(3) And (3) carrying out hot air penetration shaping on the first laminated piece at the temperature of 80 ℃ to obtain the shaped first laminated piece.

(4) And (3) paving the high-molecular water-absorbent resin powder with the granularity of 200 mu m on the fluffy cotton layer of the shaped first laminated piece so as to disperse the high-molecular water-absorbent resin powder in the fluffy cotton layer and enable the high-molecular water-absorbent resin powder and the fluffy cotton layer to form a first water-absorbent layer together.

(5) And (2) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 8mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 90% to 10% to obtain a second mixed material. And carrying out air pressure forming on the second mixed material, and then carrying out hot air penetration forming at 120 ℃ to form a second flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is a polypropylene fiber and a polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 3:7, the length of the hot melt fiber is 3-8 mm, and the specification is 3D.

(7) And (3) forming a second fluffy cotton layer on the second flow guide layer by adopting the same method of the fluffy cotton layer in the step (2), and then paving the high molecular water-absorbent resin powder with the granularity of 300 mu m on the fluffy cotton layer so as to disperse the high molecular water-absorbent resin powder in the second fluffy cotton layer, so that the high molecular water-absorbent resin powder and the second fluffy cotton layer form a second water-absorbent layer together.

(8) And (3) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 5mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 80 to 20 percent to obtain a third mixed material. Laying the third mixed material on the second water absorption layer to form a third flow guide layer to obtain a second laminated member, wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 4:6, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 3D.

(9) And (2) enabling hot wind in a hot box at 160 ℃ to penetrate and shape the second laminated piece, then conducting air draft cooling on the shaped second laminated piece, enabling the relative humidity of the second laminated piece to be 8% RH, then conducting hot pressing on the second laminated piece through a hot pressing roller with bumps under the conditions that the pressure is 5MPa and the temperature is 200 ℃ to form a concave-convex structure on the second laminated piece, and then cutting the second laminated piece through a hot pressing splitting machine to obtain the water-absorbing core body.

Wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 150 m/min, and the temperature is 120 ℃; the whole water-absorbing core body consists of 4% of chemical fibers (namely the chemical fibers in the fluffy cotton forming the two water-absorbing layers), 26% of fluff pulp (the total content of the fluff pulp of the first flow guide layer, the second flow guide layer and the third flow guide layer), 66% of high-molecular water-absorbing resin powder (the total content of the high-molecular water-absorbing resin powder of the two water-absorbing layers) and 4% of hot-melt fibers (the total content of the hot-melt fibers of the first flow guide layer, the second flow guide layer and the third flow guide layer) by mass percentage.

Example 10

(1) the fluff pulp is crushed and sieved by a sieve with the diameter of 8mm, and then the fluff pulp and the hot melt fiber are mixed according to the mass percentage of 50 percent to obtain a first mixed material. And carrying out air pressure forming on the first mixed material to obtain a first flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 3:7, the length of the hot melt fiber is 3-8 mm, and the specification is 2D.

(5) And (2) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 8mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 50% to obtain a second mixed material. And carrying out air pressure forming on the second mixed material, and then carrying out hot air penetration forming at 120 ℃ to form a second flow guide layer. Wherein the fluff pulp is wood pulp; the hot melt fiber is a polypropylene fiber and a polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 3:7, the length of the hot melt fiber is 3-8 mm, and the specification is 3D.

(8) And (3) crushing the fluff pulp, sieving the crushed fluff pulp by using a sieve with the diameter of 5mm, and mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 92% to 8% to obtain a third mixed material. Laying the third mixed material on the second water absorption layer to form a first third diversion layer, wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 4:6, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 3D.

(9) And (5) repeating the steps (7) and (8) to form a third water-absorbing layer and a second third flow-guiding layer on the first third flow-guiding layer to obtain a second laminated body.

(10) And hot wind penetrates the second laminated member in a hot box at 100 ℃ for shaping, then the shaped second laminated member is subjected to air draft cooling, the relative humidity of the second laminated member is 2% RH, then the second laminated member is subjected to hot pressing by a hot pressing roller with bumps under the conditions that the pressure is 6MPa and the temperature is 120 ℃, so that a concave-convex structure is formed on the second laminated member, and then the second laminated member is subjected to hot pressing and cutting by a hot pressing and splitting machine, so that the water-absorbing core body is obtained.

Wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 100 m/min, and the temperature is 150 ℃; according to the mass percentage, the whole water-absorbing core body consists of 8% of chemical fibers (namely the chemical fibers of the fluffy cotton layer forming the 3 water-absorbing layers), 16% of fluff pulp (the total content of the fluff pulp of the first flow guide layer, the second flow guide layer and the two third flow guide layers), 67% of high-molecular water-absorbing resin powder (the total content of the high-molecular water-absorbing resin powder of the three water-absorbing layers) and 9% of hot-melt fibers (the total content of the hot-melt fibers of the first flow guide layer, the second flow guide layer and the two third flow guide layers).

Example 11

The process for producing the water-absorbent core of this example is substantially the same as that of example 1, except that step (7) of this example employs ultrasonic cutting of the second laminate using an ultrasonic slitter, instead of hot press cutting of the second laminate. Wherein, the technological parameters of ultrasonic cutting are as follows: the cutting speed is 160 m/min, and the ultrasonic frequency is 20000 Hz.

Example 12

The process for producing a water-absorbent core of this example is substantially the same as that of example 8 except that step (11) of this example uses an ultrasonic slitter to ultrasonically cut the second laminate, instead of hot press cutting the second laminate. Wherein, the technological parameters of ultrasonic cutting are as follows: the cutting speed is 250 m/min, and the ultrasonic frequency is 25650 Hz.

Example 13

The process for manufacturing the water-absorbent core of this embodiment is substantially the same as the process for manufacturing the water-absorbent core of embodiment 1, except that step (7) of this embodiment is directly hot-pressed and cut after air draft cooling, and therefore step (7) of this embodiment is:

and (3) enabling hot wind in a hot box at 120 ℃ to penetrate and shape the second laminated piece, then conducting air draft cooling on the shaped second laminated piece, enabling the relative humidity of the second laminated piece to be 3% RH, and then cutting the second laminated piece in a hot-pressing mode by using a hot-pressing splitting machine to obtain the water-absorbing core body.

Example 14

The process for producing the water absorbent core of this example was substantially the same as that of example 1, except that all of the fluff pulp used in this example was straw pulp.

Example 15

The process for preparing the water-absorbing core body in the embodiment is substantially the same as the process for preparing the water-absorbing core body in the embodiment 1, except that the cutting method in the step (7) in the embodiment is different, and the step (7) in the embodiment is directly cut by a steel knife after hot pressing, namely, the step (7) in the embodiment is as follows:

and (3) enabling hot wind in a hot box at 130 ℃ to penetrate and shape the second laminated member, then conducting air draft cooling on the shaped second laminated member, enabling the relative humidity of the second laminated member to be 8% RH, then conducting hot pressing on the second laminated member through a hot pressing roller with salient points under the conditions that the pressure is 0.5MPa and the temperature is 140 ℃, so as to form a concave-convex structure on the second laminated member, and then cutting through a steel knife, so that the water absorption core body is obtained.

Comparative example 1

The procedure for the preparation of the absorbent core of comparative example 1 was as follows:

crushing the fluff pulp, and sieving the fluff pulp by a sieve with the diameter of 5 mm; according to the mass percentage, 22% of fluff pulp and 78% of high molecular water-absorbent resin powder are mixed on a production line of a toilet paper machine to form a water-absorbent core, wherein the particle size of the high molecular water-absorbent resin powder is 150 meshes, and the fluff pulp is wood pulp.

Comparative example 2

The procedure for preparing the water-absorbent core of comparative example 2 was as follows:

adopting upper and lower 45g of dust-free paper, sequentially adding macromolecular water-absorbent resin powder, 6% of fluffy cotton and 2% of hot melt adhesive in the middle, sealing the upper and lower layers of dust-free paper by using fluffy non-woven fabrics, fixing the macromolecular water-absorbent resin powder in the middle, and rolling and slitting to obtain a product, wherein the water-absorbent core body comprises 24% of dust-free paper, 68% of macromolecular water-absorbent resin powder, 6% of fluffy cotton and 2% of hot melt adhesive in percentage by mass; the hot melt adhesive is EVA resin.

Comparative example 3

The procedure for preparing the water-absorbent core of comparative example 3 was as follows:

(1) vibrating chemical fibers in a bale opener, conveying the chemical fibers to an opener by wind for loosening, conveying the loosened chemical fibers into a last cotton box by wind for storage, conveying the chemical fibers into an automatic cotton box by wind for quantification, and carding the cotton fibers in a carding machine to form a fluffy cotton layer, wherein the chemical fibers comprise 50% by mass of polyester fibers, 50% by mass of the total mass of the polypropylene fibers and the polyethylene fibers, the mass ratio of the polypropylene fibers to the polyethylene fibers is 4:6, the length of the fibers of the fluffy cotton layer is 60-64 mm, and the specification is 20D.

(2) The fluff pulp is crushed and sieved by a sieve with the diameter of 5mm, and then the fluff pulp and the hot-melt fiber are mixed according to the mass percentage of 80 percent to 20 percent to obtain a mixed material. Wherein the fluff pulp is wood pulp; the hot melt fiber is polypropylene fiber and polyethylene fiber, the mass percentage of the polypropylene fiber to the polyethylene fiber is 4:6, the length of the hot melt fiber is 3 mm-8 mm, and the specification is 3D.

(3) And (3) paving the mixed material in the step (2) on the fluffy cotton layer to form a first flow guide layer.

(4) And paving high-molecular water-absorbing resin powder with the granularity of 150 meshes on the first diversion layer to obtain the water-absorbing layer.

(5) And (3) paving the mixed material in the step (2) on the water absorption layer to obtain a second flow guide layer and obtain a laminated member.

(6) The method comprises the steps of carrying out hot air penetration shaping treatment on a laminated piece in a hot box at 130 ℃, then rolling the shaped laminated piece with residual heat, simultaneously carrying out air draft cooling, enabling the relative humidity of the laminated piece to be 8% RH and the thickness to be 2.5 mm, and curling the cooled laminated piece, wherein the pressure during rolling is 0.5 MPa.

(7) And under the conditions that the pressure is 0.5MPa and the temperature is 140 ℃, hot-pressing rollers with salient points perform hot pressing on the laminated member so that concave-convex parts are formed on the side, away from the first flow guide layer, of the laminated member, and then the laminated member is hot-pressed and cut by using a hot-pressing splitting machine to obtain the water-absorbing core body.

Wherein, the technological parameters of the hot-pressing cutting are as follows: the cutting speed is 180 m/min, and the temperature is 140 ℃; according to the mass percentage, the whole water-absorbing core body consists of 10% of chemical fibers (namely the chemical fibers forming the fluffy cotton layer), 16% of fluff pulp (the total content of the fluff pulp of the first flow guide layer and the second flow guide layer), 70% of high polymer water-absorbing resin powder and 4% of hot melt fibers (the total content of the hot melt fibers of the first flow guide layer and the second flow guide layer).

Comparative example 4

The process for producing the water absorbent core of comparative example 4 was substantially the same as that of example 1 except that comparative example 4 was not subjected to through-air setting before step (4), that is, comparative example 4 did not have step (3), and the high molecular water absorbent resin powder was directly dispersed in the bulky cotton layer of the first laminate of step (2).

Comparative example 5

The water-absorbent core of comparative example 5 was produced in substantially the same manner as in example 1, except that the second flow guide layer of comparative example 5 was not through-air set before being formed on the water-absorbent layer, that is, the water-absorbent core of comparative example 5 was produced as follows:

steps (1) to (4): the procedure was the same as in steps (1) to (4) of example 1.

And (5): and (2) crushing the fluff pulp, sieving the fluff pulp by using a sieve with the diameter of 5mm, mixing the fluff pulp and the hot-melt fibers according to the mass percentage of 80 to 20 percent to obtain a second mixed material, and paving the second mixed material on the water absorption layer to obtain a second laminated member.

And (6): same as in step (7) of example 1.

And (3) testing:

firstly, connectivity testing: since the water absorbent core of comparative example 1 has a one-layer structure, no delamination occurs, and no connectivity test is required, the water absorbent cores of examples 1 to 15 and comparative examples 2 to 5 were subjected to water absorption treatment, respectively, until the water absorbent cores sufficiently absorb water (i.e., saturated), and whether the water absorbent cores delaminated was observed. The results of delamination of the water-absorbent cores of examples 1 to 14 and comparative examples are shown in Table 1.

Secondly, testing the absorption speed: 36 CM of the water-absorbing cores of examples 1 to 14 and comparative examples 1 to 5 were weighed with an electronic balance, respectively, to an accuracy of 1 mm, and then placed on a flat-laying platform with a 30CM tube vertically placed in the middle of the water-absorbing core. Measuring 80ml of standard synthetic test solution at 23 ℃ by using a measuring cylinder, pouring the standard synthetic test solution into a tube with the caliber of 30CM, starting timing, and recording the time for absorption when the test solution in the tube with the caliber of 30CM disappears. The absorption time is expressed in seconds, and two measurements were carried out for each water-absorbent core at an interval of 10 minutes to obtain the time for the first absorption test and the time for the second absorption test, respectively.

The standard synthetic test solution is prepared according to main physical properties of human urine, has similar flowing and absorbing characteristics, and can well simulate the properties of the human urine. The standard synthetic test solution comprises the following specific components: 991ml of water (distilled or deionized) and 9.00g of sodium chloride.

Third, the determination of the reverse osmosis performance (water locking performance) of the water absorbent core bodies of examples 1 to 15 and comparative examples 1 to 5: the weight T1 of a 10CM diameter filter paper is tested, then 5 minutes after pouring a standard synthetic test solution for the second time of the absorption speed test, the filter paper is placed on the absorption core, a 2KG weight block is crushed on the filter paper side, the block is taken off after 1 minute, the filter paper is taken down, the weight T2 of the filter paper is weighed, and the reverse osmosis amount T is T2-T1.

Fourth, measurement of the water absorption capacity of the water absorbent core of examples 1 to 15 and comparative examples 1 to 5:

(1) instruments and reagents

a. The electronic balance has a sensitive quantity of 0.001 g.

b. The paper tea bag has size of 60mm 85mm, and air permeability (230 + -50) L/(min 100 cm)²) (pressure difference 124pa)

c. The clip is used for fixing the tea bag.

d. Standard synthetic test solution

(2) The determination step comprises:

a. 14g of sample was weighed to the nearest 0.001g and the mass was recorded as m 0.202 g. And (4) pouring all the samples into the bottom of the tea bag, wherein all the samples attached to the inner side of the tea bag are poured into the bottom of the tea bag.

b. Sealing the tea bag, and soaking in a beaker filled with enough standard synthetic test solution for 30 min.

c. The tea bag containing the sample was gently lifted out, hung with a clip, and dropped for 10min at rest. When a plurality of tea bags are hung at the same time, the tea bags are not contacted with each other.

d. After 10min, the weight m of the tea bag containing the sample is weighed₁＝422g。

e. Using the tea bag without sample to simultaneously perform blank value measurement, weighing the mass of the blank test tea bag, and recording the mass as m₂＝2g。

(3) Presentation of the results of the measurement

The absorption amount of the sample can be calculated by the formula (F.1):

wherein w is the absorption of the sample in grams per gram (g/g);

m₁-the mass in grams (g) of the tea bag containing the sample;

m₂-mass in grams (g) of blank test tea bag;

m-the mass of the sample is weighed in grams (g).

Two measurements were made for each sample and the arithmetic mean was taken as the measurement result, which was trimmed to one decimal place. The absorption amounts of the water-absorbent core bodies of examples 1 to 15 and comparative examples 1 to 5 are shown in Table 1.

Table 1 shows the connectivity, water absorption capacity, and absorption time rewet of the water-absorbent core of examples 1 to 15 and comparative examples 1 to 5.

TABLE 1

As can be seen from Table 1, the water absorbent cores of examples 1-15 have no delamination phenomenon after sufficient water absorption, while the water absorbent core of comparative example 1 has a one-layer structure, i.e., the water absorbent cores of examples 1-15 have good connectivity, while the water absorbent core of comparative example 2 has delamination phenomenon after sufficient water absorption.

And the absorption time of the water absorption core bodies in the embodiments 1 to 15 after the standard synthetic test solution is poured for the second time is 7 seconds at most, which is far better than that in the comparative examples 1 to 5. The reverse osmosis amount of the water-absorbing core bodies of the examples 1 to 15 is at most 0.9g and is far lower than that of the comparative examples 1 to 5, and obviously, the water-absorbing core bodies of the examples 1 to 15 have better absorption performance and water locking performance.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The preparation method of the water-absorbing core body is characterized by comprising the following steps:

forming a first mixed material to form a first flow guide layer, wherein the first mixed material comprises fluff pulp and hot-melt fibers; the method for molding the first mixed material is airflow molding;

forming a second mixed material, and then carrying out hot air penetration and shaping to form a second flow guide layer, wherein the second mixed material comprises fluff pulp and hot-melt fibers; the second mixed material is molded by airflow molding;

laminating the second flow guide layer on the water absorbing layer to obtain a second laminated member;

carrying out through-air hot air shaping on the second laminated piece, and cooling;

hot-pressing the second laminate to form a relief structure on the second laminate; and

and cutting the second laminated piece to obtain the water-absorbing core body.

2. The method for preparing a water absorbent core according to claim 1, wherein the step of subjecting the first laminate to through-air setting is performed at a temperature of 60 ℃ to 200 ℃;

3. The method for preparing a water-absorbing core body as claimed in claim 1, wherein the cooling method is suction cooling.

4. The method of making a water-absorbing core as recited in claim 1, wherein the relative humidity of the second laminate after the step of cooling is from 3% RH to 10% RH.

5. The method for preparing a water-absorbing core according to claim 1, wherein the hot-pressing pressure is 0.3MPa to 10MPa, and the hot-pressing temperature is 80 ℃ to 250 ℃.

6. The method of making a water-absorbing core as recited in claim 1, further comprising the step of forming the water-absorbing layer and a third flow-guiding layer on the second flow-guiding layer alternately before the step of through-air-setting the second laminate, wherein the material of the third flow-guiding layer comprises fluff pulp and hot-melt fibers.

7. The method of making a water-absorbing core as recited in claim 6, wherein the step of forming the third wicking layer comprises: forming the material of the third flow guide layer, and then carrying out hot air penetration and shaping to form the third flow guide layer;

8. The method for preparing the water absorbent core according to any one of claims 1 to 7, wherein the chemical fibers comprise polyester fibers, polypropylene fibers and polyethylene fibers, and the mass percentage of the polyester fibers in the chemical fibers is 1-95%;

and/or the fluff pulp is wood pulp or straw pulp;

and/or the hot melt fiber comprises polypropylene fiber and polyethylene fiber.

9. A water-absorbent core produced by the method for producing a water-absorbent core according to any one of claims 1 to 8.

10. Use of the absorbent core of claim 9 in the manufacture of a diaper or sanitary napkin.