CN111317616A

CN111317616A - Core and preparation method and application thereof

Info

Publication number: CN111317616A
Application number: CN202010128186.4A
Authority: CN
Inventors: 詹卫东
Original assignee: Huzhou Wecan New Mstar Technology Co ltd
Current assignee: Huzhou Wecan New Mstar Technology Co ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-06-23

Abstract

The invention relates to the field of hygienic products, in particular to a core body and a preparation method and application thereof. The core body comprises an upper plant fiber non-woven fabric layer and a lower plant fiber non-woven fabric layer which are oppositely arranged up and down; a grid diversion coating layer is arranged outside the upper layer of the plant fiber non-woven fabric and the lower layer of the plant fiber non-woven fabric; plant fiber non-woven fabrics upper strata with set up regular or irregular curvilinear figure spunlace between the plant fiber non-woven fabrics lower floor, the curvilinear figure of spunlace cloth include with the last concave inflection point of plant fiber non-woven fabrics upper strata counterbalance and with plant fiber non-woven fabrics lower floor offsets or the concave inflection point that does not offset. The production line of the core body comprises a first winding wheel, and the first winding wheel is connected with a first structural adhesive spray gun for spraying adhesive; the second winding wheel is connected with a third winding wheel; the second winding wheel and the third winding wheel are directly provided with a second structural adhesive spray gun and a circular concave-convex die. The core body of the invention has high diffusion capacity and low back-seepage amount.

Description

Core and preparation method and application thereof

Technical Field

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

Background

The water-absorbing sanitary material comprises female sanitary products such as sanitary napkins, sanitary pads and the like, baby sanitary products such as baby diapers and adult nursing products such as adult diapers, and basically mainly comprises a four-layer structure: surface course, water conservancy diversion layer, absorbed layer and bottom.

In the past, the sanitary product surface layer mainly uses soft hot-air non-woven fabric mainly made of chemical fiber materials, and the diversion layer generally uses hot-air non-woven fabric or melt-spun non-woven fabric mainly made of chemical fiber materials. Body fluid permeates through the surface layer material, is guided by the guide layer and is quickly absorbed by the absorption layer, so that dry and comfortable feeling of consumers in use is guaranteed. Some sanitary product enterprises begin to use pure natural cotton spunlace nonwoven fabrics for the surface layer, but due to the production process, material cost, moisture of the surface layer and the like, the wide application of pure natural cotton materials in the sanitary products is also limited to a great extent.

Existing absorbent layers, i.e., core structures, typically include a dusting paper, a lofty nonwoven fabric, and a water-retaining SAP disposed therein. The fluffy non-woven fabric is usually of a 100% fiber structure, and has the defect of low diffusion capability, so that the core structure of the existing sanitary material has low diffusivity and large back-seepage amount, and the environmental protection problem caused by using the dust-free paper is also to be modified.

Disclosure of Invention

A first object of the present invention is to provide a core having an improved diffusion capacity and a low amount of back-bleeding.

A second object of the present invention is to provide a method for preparing a core having improved diffusion capacity and low back-bleeding.

A third object of the invention is to provide the use of a core with improved diffusion capacity and low amount of rewet.

The first technical object of the present invention is achieved by the following technical solutions:

a core body comprises an upper plant fiber non-woven fabric layer and a lower plant fiber non-woven fabric layer which are oppositely arranged up and down; a grid diversion coating layer is arranged outside the upper layer of the plant fiber non-woven fabric and the lower layer of the plant fiber non-woven fabric;

a regular or irregular curved spunlace is arranged between the upper layer of the plant fiber non-woven fabric and the lower layer of the plant fiber non-woven fabric, and the curve of the spunlace comprises an upper concave inflection point which is abutted against the upper layer of the plant fiber non-woven fabric and a lower concave inflection point which is abutted against or not abutted against the lower layer of the plant fiber non-woven fabric; and a cavity formed by the curved spunlace cloth and the lower layer of the plant fiber non-woven cloth is filled with high-molecular water-absorbent resin.

The invention is provided with the grid diversion coating layer and the specific intermediate layer, so that the diffusion capacity of the core body is improved, and the return seepage quantity is low. The grid diversion coating layer is a grid diversion layer which is coated on the outermost layer of the core body and has rapid longitudinal diversion, and can rapidly and longitudinally shunt liquid.

Preferably, the concave inflection point is not abutted to the lower layer of the plant fiber non-woven fabric, and a diversion trench is arranged between the lowest positions of the adjacent curves of the spunlace fabrics.

Preferably, the diversion trench is of a funnel-shaped structure and comprises a wide-mouth cavity with an inverted trapezoid cross section at the upper part and a rectangular cavity with a rectangular cross section at the lower part.

The flow guide groove with the special structure can improve the diffusion capacity of the core body.

Preferably, fluffy non-woven fabrics layers are arranged on the top and the bottom of the rectangular cavity of the diversion trench in the longitudinal direction.

Preferably, the height H1 of the fluffy non-woven fabric layer arranged between the upper concave inflection point and the top of the diversion trench in the longitudinal direction is 2.5-3.5 cm; the core body length is 100-120 cm; the distance between two adjacent upper concave inflection points is 8-12 mm; the maximum diameter D1 of the wide-mouth cavity is 1-1.5 cm; the diameter D2 of the rectangular cavity is 0.2-0.5 cm.

Preferably, the wave-shaped upper concave inflection point and the wave-shaped lower concave inflection point of the spunlace fabric are respectively abutted against the upper layer of the plant fiber non-woven fabric and the lower layer of the plant fiber non-woven fabric;

a first wave area with the highest point being two upper concave inflection points and the lowest point being one lower concave inflection point is arranged between the upper layer of the plant fiber non-woven fabric and the spunlace fabric, and more than two first wave areas form a first water-locking SAP layer;

and a continuous second wave area which comprises an upper concave inflection point at the highest point and two lower concave inflection points at the lowest point is arranged between the upper layer of the plant fiber non-woven fabric and the spunlace fabric, and more than two second wave areas form a second water-locking SAP layer.

The actual liquid content in the diaper changed by most users after use does not exceed 250-300ml, but the liquid distribution is not uniform in use, the liquid absorbing material is not fully utilized, and the two ends of the product are not conveyed to reach and absorb under the saturated or super-saturated state in the middle part. The phenomenon is more serious after SAP is introduced, fluff pulp fibers are good liquid conduction media except for absorption capacity, and the fibers and the surface structure form a flow-guiding capillary structure, so that the horizontal diffusion and even the vertical diffusion of liquid are facilitated, and a good flow-guiding effect is achieved. The SAP particles also have capillary structures, but have a much poorer orientation ratio with respect to the fibers, and particularly when the SAP becomes soft after water swelling, gaps between the particles are blocked under a smaller pressure, thereby preventing the flow and conduction of liquid in the product and causing the rewet phenomenon.

According to the invention, original dust-free paper as the core body material is replaced by the plant fiber non-woven fabric which is more environment-friendly, the longitudinal elongation is far greater than that of the chemical fiber, and the SAP is applied by fixed-point quantitative application, so that the SAP is not easy to slip after production, transportation and urine soaking. Due to the improvement of the longitudinal diffusion capacity, the utilization rate and the use effect of the core body are obviously improved, and the application amount of the SAP can be greatly reduced, so that the production cost is reduced. The "longitudinal direction" in the present invention refers to the corresponding front-to-back direction of the wearer.

Preferably, the height between the upper concave inflection point and the lower concave inflection point is 2-4 mm; the distance between two adjacent upper concave inflection points is 10-20 mm.

The arrangement of different heights and spacings can affect the diffusion energy and the amount of back-bleed of the core.

More preferably, the height between the upper concave inflection point and the lower concave inflection point is 2 mm; the distance between two adjacent upper concave inflection points is 10 mm.

More preferably, the height between the upper concave inflection point and the lower concave inflection point is 3 mm; the distance between two adjacent upper concave inflection points is 20 mm.

Preferably, a grid diversion coating layer is arranged outside the upper layer of the plant fiber non-woven fabric and the lower layer of the plant fiber non-woven fabric.

The inventor sets up net water conservancy diversion coating, wraps non-woven fabrics upper strata, plant fiber non-woven fabrics lower floor, wave curve shape water thorn cloth and first lock water SAP layer and second lock water SAP layer wherein, prevents that first lock water SAP layer and second lock water SAP layer from leaking when preparation and use. The grid diversion coating layer is a grid diversion layer which is coated on the outermost layer of the core body and has rapid longitudinal diversion, and can rapidly and longitudinally shunt liquid.

Preferably, the upper layer of the plant fiber non-woven fabric and/or the lower layer of the plant fiber non-woven fabric are/is full plant fiber superconducting non-woven fabric, and the full plant fiber is natural viscose fiber made of cotton raw materials and wood pulp fiber.

The prior art adopts the dust-free paper, and the dust of the dust-free paper is still larger during production and use, so the invention adopts the full-plant fiber superconducting non-woven fabric to replace the dust-free paper, the production is more environment-friendly and healthy, and the diffusion effect is better during use. The flow guide length of the full plant fiber superconducting non-woven fabric can be increased by more than 30 percent on the original basis.

Preferably, the spunlace fabric is wood pulp spunlace fabric, bamboo fiber spunlace fabric, silk spunlace fabric or viscose spunlace fabric.

Preferably, the spunlace fabric is wood pulp spunlace fabric; the wood pulp spunlace fabric comprises 65-75% of wood pulp fibers and 25-35% of viscose fibers.

The wood pulp spunlace non-woven fabric is developed on the basis of the spunlace non-woven fabric, and is produced by adding a layer of wood pulp paper in the production of common spunlace non-woven fabric. The product has unique absorption capacity and liquid absorption capacity, excellent dust-free performance, softness, static resistance, performance of not damaging the surface of an object, toughness, durability and the like, and does not use any chemical adhesive. The performance characteristics are as follows:

1. the cleaning agent has no dust, no fiber falls off during use, no fiber scraps are generated, and the cleaning quality is ensured;

2. uniform net formation and excellent longitudinal and transverse tension

3. The material is soft, and does not generate any scratch on the surface of a cleaning object and damage the surface of the object;

4. the super-strong liquid absorption capacity is more than four times faster than that of the common cotton rag;

5. the water stain and oil stain removing capability is efficiently removed;

6. excellent dissolution resistance;

7. no static electricity is generated.

Preferably, the pitches of the first wave zones are different and equal, and the pitches of the second wave zones are different and equal; the first and second water-locking SAP layers are equal in depth.

Super Absorbent Polymer, SAP for short, is a novel functional Polymer material, is synthesized by polymerization of low molecular substances or is prepared by chemical reaction of a Polymer compound, and is a functional Polymer material which is appropriately crosslinked and has a three-dimensional network structure. The main component of the water-absorbing resin comprises polyacrylic acid series super absorbent resin or polyvinyl alcohol series water absorbent resin. The molecular chain of the SAP contains strong hydrophilic groups such as hydroxyl, carboxyl and the like, can absorb water which is hundreds of times or even thousands of times of the self weight, and can effectively lock water and repeatedly release and absorb water.

For example, the chemical equation for SAP polymerization according to the present invention is as follows

The SAP can be classified into a slow water-locking SAP and a fast water-locking SAP according to the strength of water absorption property. Preferably, the first water-locking SAP layer is a slow water-locking SAP layer.

Preferably, the second water-locking SAP layer is a slow water-locking SAP material layer.

With a SAP having a slower absorption rate, a first water-locking SAP layer, i.e. a layer of slow-water-locking SAP material, is reached. The layer height, i.e. depth, of the first and second water-locking SAP layers is tailored to the requirements. SAP is quantitatively applied at fixed points, and pressed into arc-shaped pits through the middle wood pulp spunlace, and SAP is distributed at the pits.

The second technical object of the present invention is achieved by the following technical solutions:

a method for preparing a core comprises the following steps: step S1, preparing plant fiber non-woven fabric, and leading out the plant fiber non-woven fabric through a second winding wheel to form a lower layer of the plant fiber non-woven fabric;

step S2, the lower layer of the plant fiber non-woven fabric passes through a second structural adhesive spray gun, and is sprayed with adhesive to obtain a lower layer of the plant fiber non-woven fabric sprayed with the adhesive; preparing a spunlace fabric, leading out the spunlace fabric through a third winding wheel, passing through a circular concave-convex die, and laminating and bonding the spunlace fabric and the lower layer of the plant fiber non-woven fabric sprayed with glue to form a spunlace fabric with a wave curve shape;

step S3, directly applying a second water-locking SAP material to a second wave zone formed between the lower layer of the plant fiber non-woven fabric and the spunlace fabric, wherein the second wave zone comprises an upper concave inflection point as the highest point and two lower concave inflection points as the lowest point to form a second water-locking SAP layer;

step S4, spraying glue on the plant fiber non-woven fabric led out by the first winding wheel through the first structural glue spray gun after passing through the polymer sweeping wheel to form an upper layer of the plant fiber non-woven fabric;

step S5, applying a first water-locking SAP material to a first wave zone composed of two concave inflection points formed by the upper layer of the plant fiber non-woven fabric and the spunlace fabric and a concave inflection point at the lowest point to form a first water-locking SAP layer.

Preferably, the production line of the core body comprises a first winding wheel, and the first winding wheel is connected with a first structural adhesive spray gun for spraying adhesive;

the second winding wheel is connected with a third winding wheel; and the second winding wheel and the third winding wheel are directly provided with a second structural adhesive spray gun and a circular concave-convex die.

The third technical object of the present invention is achieved by the following technical solutions:

the application of a core body for preparing a sanitary nursing product, wherein a non-woven fabric layer is arranged above the core body, and a 3D embossed composite surface layer is arranged above the non-woven fabric layer; a bottom film layer is arranged below the core body;

the 3D embossing composite surface layer comprises an upper weak hydrophilic fiber non-woven fabric first composite layer and a lower multi-hydrophilic fiber non-woven fabric second composite layer;

the non-woven fabric layer is provided with a hydrophobic fabric layer with hydrophobic performance, and one surface of the hydrophobic fabric layer is provided with a hydrophilic channel flow guide layer extending longitudinally;

the surface of the hydrophilic channel diversion layer of the hydrophobic cloth layer is adjacent to the upper surface of the lower multi-hydrophilic fiber non-woven cloth layer.

According to the invention, original dust-free paper as the core body material is replaced by the plant fiber non-woven fabric which is more environment-friendly, the longitudinal elongation is far greater than that of the chemical fiber, and the SAP is applied by fixed-point quantitative application, so that the SAP is not easy to slip after production, transportation and urine soaking.

Moreover, the existing non-woven fabrics used for absorbing articles are generally hydrophilic on the surface layer, so that the water retention rate of the surface layer is too high, and the absorbing articles extend from the surface layer firstly, so that the surface layer is serious in moisture, slow in diffusion and small in longitudinal diffusion length; in the core body, liquid is diffused from a single point of the surface layer and longitudinally extends through the longitudinally extending hydrophilic channel flow guide layer, so that the surface layer is dry and comfortable, the flow guide diffusion is fast, and the diffusion length is increased by more than 5 percent compared with the conventional diffusion length; the diversion diffusion length is increased, the liquid passing performance is good, the liquid is not remained on the surface, and the surface layer is dry and clean.

The conventional surface layer is generally a plain surface layer in cross section, and the plain surface layer has large contact area with skin and larger friction force; the common plain weave surface layer generally adopts single-parent or multi-parent fiber non-woven fabrics for keeping lasting and dry, the surface layer is strong in water saturation and easy to wet, reverse osmosis is serious, the comfort of the surface layer is low, the dry and air permeability is poor, and bacteria are easy to breed.

The inventor designs the surface layer section into a 3D embossed surface layer through repeated polishing, the surface layer non-woven fabric adopts multiple hydrophilic non-woven fabrics, and after 3D embossing treatment, the curve area is increased, and the air permeability is improved; the bottom layer non-woven fabric is a plurality of times of hydrophilic non-woven fabrics and is compounded with the surface layer, so that the 3D effect is improved, and the infiltration speed is improved; however, another disadvantage is found, but both the two non-woven fabrics adopt multi-parent non-woven fabrics, the diffusion area of the surface layer is large, the single-point permeation effect cannot be achieved, the reverse permeation is serious, and the comfort level is reduced.

The inventor continues to pass through many experiments again, designs 3D knurling surface course into special compound surface course, promptly: the 3D embossed composite surface layer comprises an upper weak hydrophilic fiber non-woven fabric layer and a lower multi-hydrophilic fiber non-woven fabric layer; the surface layer non-woven fabric is a weak hydrophilic fiber non-woven fabric, so that objects to be absorbed such as urine or menstrual blood cannot diffuse and store water, multiple single-point permeation can be realized, after 3D embossing treatment, the curve area is increased, the downward permeation speed is increased, and the air permeability is better; the bottom layer non-woven fabric adopts strong hydrophilic fiber which is hydrophilic for many times, has excellent longitudinal diffusion performance, and can permeate the surface layer downwards to enable the object to be absorbed, such as urine or menstrual blood, to be rapidly and longitudinally shunted; after the double-layer non-woven fabric is compounded, when the absorbent such as urine or menstrual blood is used, the absorbent can rapidly penetrate through the surface layer at a single point, after the non-woven fabric on the bottom layer, the absorbent can be longitudinally and rapidly diffused to the absorption core body, the surface layer can not remain the absorbent such as urine or menstrual blood, the anti-reverse osmosis effect is obvious, and the dryness and the shielding performance are excellent.

Meanwhile, the surface of the hydrophilic channel diversion layer of the hydrophobic cloth layer is adjacent to the upper surface of the lower multi-hydrophilic fiber non-woven cloth layer, and skin does not need to be in direct contact with the hydrophilic channel diversion layer, so that the comfortable feeling of a human body can be further increased, and the fabric is healthy, safe, dry, breathable, antibacterial, environment-friendly, close-fitting and non-feeling.

Preferably, the hydrophilic channel flow guide layer is of a uniform flower-shaped grid channel structure, and the depth of the hydrophilic channel flow guide layer is equal to the thickness of the hydrophobic cloth layer.

The grid line flow guide is manufactured through a special process, and the object to be absorbed, such as urine or menstrual blood, is quickly and longitudinally guided through the super-diffusion hydrophilic raw materials on the flow guide lines and is dispersed to each part of the core body below the non-woven fabric, so that the problem of overlarge middle local absorption pressure is solved, and the optimal absorption effect is finally achieved.

Preferably, the hydrophilic channel flow guide layer is a diamond grid structure layer.

Preferably, the surface of the hydrophobic cloth layer is embossed and/or perforated to form convex lines, the high point part of each convex line is subjected to hydrophilic treatment, so that a hydrophilic unit point is formed on the surface of each convex high point part, and all hydrophilic unit points are combined to form the hydrophilic channel flow guide layer.

Preferably, the hydrophilic channel flow guide layer is a multi-time hydrophilic oil agent layer.

Preferably, the hydrophobic cloth layer is a synthetic polymer material fiber layer.

The synthetic polymer material fiber is one or more of polypropylene fiber, low-density polyethylene fiber, high-density polyethylene fiber or ES fiber.

Drawings

FIG. 1 is a schematic view of a conventional core construction;

FIG. 2 is a schematic view of the core structure of the present invention;

FIG. 3 is a schematic view of the core absorption of the present invention;

FIG. 4 is a schematic view of a disposable hygienic article using a conventional nonwoven fabric;

FIG. 5 is a schematic view of a disposable hygienic article using the nonwoven fabric having longitudinal flow distribution properties of the present invention;

FIG. 6 is a schematic diagram of a test experiment for flow guiding effect;

FIG. 7 is a schematic view of the flow guide effect;

FIG. 8 is a schematic flow chart of a method of making the core of the present invention;

FIG. 9 is a schematic illustration of an SAP of the present invention;

FIG. 10 is a schematic view of another core construction of the present invention;

FIG. 11 is a longitudinal expanded view of the core structure of FIG. 10;

FIG. 12 is an enlarged schematic view of the channels of the core construction of FIG. 10;

in the figure, 3-core; 31-upper layer of non-woven fabric of plant fiber; 32-a lower layer of non-woven fabric of plant fibers; 33-spunlace cloth; 34-a first water-locking SAP layer; 35-a second water-locking SAP layer; 36-grid flow guide coating layer; 331-upper concave inflection point; 332-concave inflection point; 310-a first wave zone; 320-a second wave zone; 10-surface layer; 20-a flow guiding layer; 1-3D embossing a composite facing; 2-non-woven fabrics; 21-a hydrophobic cloth layer; 22-a hydrophilic channel flow-guiding layer; 4-basement membrane; 37-dust-free paper; 38-fluffy non-woven fabric; 39-diversion trench; 391-wide-mouth cavity; 392-a rectangular cavity; 51-a first wind-up wheel; 52-a second take-up reel; 53-third wind-up wheel; 54-a second structural adhesive gun and; 55-round concave-convex mould; and 56, spraying glue by a first structural glue spray gun.

Detailed Description

As shown in fig. 1, the existing absorbent layer, i.e., core structure, generally comprises a dust-free paper 37, a bulky nonwoven 38 and a water-retaining SAP disposed therein. The fluffy non-woven fabric is usually a 100% fiber structure, and has the defect of low diffusion capacity, so that the core structure of the existing sanitary material has low diffusion and large back-seepage amount.

Example 1

As shown in fig. 2 to 7, a core body comprises an upper layer 31 of non-woven fabric of plant fiber and a lower layer 32 of non-woven fabric of plant fiber which are arranged oppositely;

a wave curved spunlace 33 is arranged between the plant fiber non-woven fabric upper layer 31 and the plant fiber non-woven fabric lower layer 32, and a wave curved upper concave inflection point 331 and a wave curved lower concave inflection point 332 of the spunlace 33 are respectively abutted against the plant fiber non-woven fabric upper layer 31 and the plant fiber non-woven fabric lower layer 32; the spunlace fabric 33 is respectively adhered with the plant fiber non-woven fabric upper layer 31 and the plant fiber non-woven fabric lower layer 32 by hot melt structural adhesive spraying;

a first wave zone 310 comprising two upper concave inflection points 331 at the highest point and one lower concave inflection point 332 at the lowest point is arranged between the plant fiber non-woven fabric upper layer 31 and the spunlace fabric 33, and more than two first wave zones 310 form a first water-locking SAP layer 34;

a second wave zone 320 comprising an upper concave inflection point 331 at the highest point and two lower concave inflection points 332 at the lowest point is arranged between the plant fiber non-woven fabric upper layer 32 and the spunlace fabric 33, and the second water-locking SAP layer 35 is formed by more than two second wave zones 320. Wherein, the upper layer 31 and/or the lower layer 32 of the plant fiber non-woven fabric is a full plant fiber superconducting non-woven fabric, and the full plant fiber is natural viscose fiber made of cotton raw material. The spunlace fabric 33 is wood pulp spunlace fabric; the wood pulp spunlace fabric comprises 65-75% of wood pulp fibers and 25-35% of viscose fibers.

The inventor replaces original dustless paper of core material with the plant fiber non-woven fabrics that has more environmental protection, and longitudinal elongation also is greater than chemical fiber far away, and SAP applies and adopts the fixed point ration to apply, all is difficult for slipping after production, transport and urine soak. Due to the improvement of the longitudinal diffusion capacity, the utilization rate and the use effect of the core body are obviously improved, and the application amount of the SAP can be greatly reduced, so that the production cost is reduced.

Example 2

The difference from the embodiment 1 is that a lattice flow guiding coating layer 36 is arranged outside the upper layer 31 and the lower layer 32 of the plant fiber non-woven fabric. Wherein, the pitches of the first wave regions 310 are equal, and the pitches of the second wave regions 320 are equal; the first water-locking SAP layer 34 and the second water-locking SAP layer 35 are equal in depth. The spunlace fabric 33 is wood pulp spunlace fabric; the wood pulp spunlace fabric comprises 70% of wood pulp fibers and 30% of viscose fibers.

The inventor sets up grid water conservancy diversion coating 36, wraps up non-woven fabrics upper strata 31, vegetable fibre non-woven fabrics lower floor 32, wave curve form spunlace 33 and wherein first water-locking SAP layer 34 and second water-locking SAP layer 35, prevents that first water-locking SAP layer 34 and second water-locking SAP layer 35 from leaking during preparation and use.

Example 3

The same as example 1 except that the spunlace fabric 33 is a wood pulp spunlace fabric; the wood pulp spunlace fabric comprises 75% of wood pulp fibers and 25% of viscose fibers.

Example 4

The same as example 1, except that the spunlace fabric 33 is a bamboo fiber spunlace fabric.

Example 5

A method for preparing a core comprises the following steps:

step S1, preparing a plant fiber nonwoven fabric, and drawing the plant fiber nonwoven fabric through the second winding wheel 52 to form the plant fiber nonwoven fabric lower layer 32;

step S2, the plant fiber non-woven fabric lower layer 32 passes through the second structural adhesive spray gun 54, and the plant fiber non-woven fabric lower layer 32 after being sprayed with the adhesive is obtained after the adhesive is sprayed; preparing a spunlace fabric 33, leading the spunlace fabric 33 out through a third winding wheel 53, passing through a circular concave-convex die 55, and pressing and bonding the spunlace fabric 33 with the sprayed plant fiber non-woven fabric lower layer 32 to form the spunlace fabric 33 with a wavy curved shape;

step S3, directly applying a second water-locking SAP material to a second wave zone 320 formed between the lower layer 32 of the plant fiber non-woven fabric and the spunlace 33 and including an upper concave inflection point 331 as the highest point and two lower concave inflection points 332 as the lowest point to form a second water-locking SAP layer 35;

step S4, the plant fiber non-woven fabric drawn out by the first winding wheel 51 passes through a polymer sweeping wheel and then is sprayed with glue 56 by a first structural glue spray gun to form a plant fiber non-woven fabric upper layer 31;

in step S5, a first water-locking SAP material is applied to a first wave zone 310 composed of two upper concave inflection points 331 and a lowest concave inflection point 332 formed by the upper layer 31 of the plant fiber non-woven fabric and the spunlace fabric 33 to form a first water-locking SAP layer 34.

Example 6

As shown in fig. 8, the production line of the core includes a first winding wheel 51, and the first winding wheel 51 is connected with a first structural adhesive spray gun for spraying adhesive 56; the second winding wheel 52 is connected with a third winding wheel 53; the second winding wheel 52 and the third winding wheel 53 are directly provided with a second structural adhesive spray gun 54 and a circular concave-convex mold 55.

Example 7

As shown in fig. 10-12, the concave inflection point 332 of the hydroentangled fabric does not abut against the lower layer 32 of the plant fiber nonwoven fabric, and a diversion trench 39 is provided between the lowest positions of the adjacent curves of the hydroentangled fabric 33. The guiding groove 39 is a funnel-shaped structure, and includes a wide-mouth cavity 391 with an inverted trapezoid cross section at the upper part and a rectangular cavity 392 with a rectangular cross section at the lower part. The top and bottom longitudinal directions of the rectangular cavity 392 of the flow channel 39 are provided with a lofty nonwoven layer 38. The height H1 of the fluffy non-woven fabric layer 38 arranged in the longitudinal direction of the upper concave inflection point 331 and the top of the diversion trench 39 is 2.5-3.5 cm; the core body length is 100-120 cm; the distance between two adjacent upper concave inflection points is 8-12 mm; the maximum diameter D1 of the wide-mouth cavity 391 is 1-1.5 cm; the diameter D2 of the rectangular cavity 392 is 0.2-0.5 cm. In preparation, the fast-lock SAP is applied continuously to the bottom layer and the slow SAP is applied intermittently to the face layer.

Application example 1

A sanitary nursing product comprises the core body of the embodiment 1 and a non-woven fabric with longitudinal flow distribution performance, wherein a 3D embossed composite surface layer 1 is arranged above a non-woven fabric 2; a core body 3 and a bottom film layer 4 are arranged below the non-woven fabric 1; the 3D embossed composite surface layer comprises an upper weak hydrophilic fiber non-woven fabric layer and a lower multi-hydrophilic fiber non-woven fabric layer; the hydrophilic channel flow-guiding layer 22 surface of the hydrophobic fabric layer 21 is disposed adjacent to the upper surface of the lower multi-hydrophilic fiber nonwoven fabric layer. The non-woven fabric with the longitudinal flow distribution performance comprises a hydrophobic fabric layer 21 with hydrophobic performance, and a hydrophilic channel flow guide layer 22 extending in the longitudinal direction is arranged on one surface of the hydrophobic fabric layer 21. The core 3 used was the core prepared in example 1.

In order to rapidly and longitudinally drain an object to be absorbed, such as urine or menstrual blood, through a super-diffusion hydrophilic raw material on a flow guide line and disperse the object to be absorbed to each part of a core body below a non-woven fabric, so that the problem of overlarge middle local absorption pressure is solved, and finally the optimal absorption effect is achieved, the inventor designs a hydrophilic channel flow guide layer 22 into a uniform flower-shaped grid channel structure, wherein the depth of the hydrophilic channel flow guide layer 22 is equal to the thickness of a hydrophobic cloth layer 21.

The lattice cell channel structure may be in various shapes, such as square, polygon, diamond, and irregular lattice. In order to make the diffusion effect more uniform, the flower-shaped grid channel structure is designed to be a uniform structure. The hydrophilic channel flow directing layer 22 is preferably a diamond grid structure layer.

The hydrophobic cloth layer 21 may also be embossed and/or perforated, and then the surface thereof forms raised lines, the high point part of each raised line is subjected to hydrophilic treatment, so that a hydrophilic unit point is formed on the surface of each raised high point part, and all hydrophilic unit points are combined to form the hydrophilic channel flow guide layer 22.

In order to improve the absorption effect, the hydrophilic channel flow guiding layer 22 is a multi-time hydrophilic oil agent layer.

The hydrophobic cloth layer 21 is an artificial synthetic polymer material fiber layer. The synthetic polymer material fiber is one or more of polypropylene fiber, low-density polyethylene fiber, high-density polyethylene fiber or ES fiber.

Application example 2

The same as in application example 1, except that the core layer was the core prepared in example 7.

Application example 3

The same as in application example 1, except that the nonwoven fabric having the longitudinal flow dividing property was not used, the nonwoven fabric of the conventional flow guiding layer was used.

Application example 4

The same as in application example 1, except that the core of the present invention was not used.

Application example 5

The same as in application example 1, except that the facing was not a 3D embossed composite facing, a conventional multi-hydrophilic fibrous facing was used.

Several samples of sanitary napkins of the present invention and prior art were selected and tested according to the national standard. Wherein, water absorption multiplying power, infiltration amount and water content/%: testing according to a method specified by GB/T8939-2008 standard; air permeability: according to the test of GB/T5453-1997 standard, the test pressure difference is adjusted to 60Pa, and the diameter of a nozzle is selected to be 5 mm. The results of the tests are specifically listed in the following table:

as can be seen from the table:

1. the sanitary nursing product adopting the core body has better performance in the aspects of water absorption multiplying power, infiltration capacity and air permeability than the common sanitary nursing products on the market; therefore, the sanitary care product prepared by the core body has high diffusion performance and low back seepage amount;

2. the sanitary nursing product adopting the core body and the special non-woven fabric structure has better performance in the aspects of water absorption multiplying power, infiltration capacity and air permeability than the sanitary nursing product adopting the common core body; therefore, the sanitary care product prepared from the non-woven fabric is high in diffusion performance and low in back seepage amount.

The sanitary care product made of the non-woven fabric can prevent the substances to be absorbed such as urine or menstrual blood from diffusing and storing water, can realize multiple single-point permeation, and increases the curve area, accelerates the infiltration speed and has better air permeability after 3D embossing treatment; the bottom layer non-woven fabric adopts strong hydrophilic fiber which is hydrophilic for many times, has excellent longitudinal diffusion performance, and can permeate the surface layer downwards to enable the object to be absorbed, such as urine or menstrual blood, to be rapidly and longitudinally shunted; after the double-layer non-woven fabric is compounded, when the absorbent such as urine or menstrual blood is used, the absorbent can rapidly penetrate through the surface layer at a single point, after the non-woven fabric on the bottom layer, the absorbent can be longitudinally and rapidly diffused to the absorption core body, the surface layer can not remain the absorbent such as urine or menstrual blood, the anti-reverse osmosis effect is obvious, and the dryness and the shielding performance are excellent. The human body has good comfort, health and safety, dryness and ventilation, antibiosis, environmental protection, close fitting and no feeling.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. A core body is characterized by comprising an upper plant fiber non-woven fabric layer (31) and a lower plant fiber non-woven fabric layer (32) which are oppositely arranged up and down; a grid diversion coating layer (36) is arranged outside the upper layer (31) of the plant fiber non-woven fabric and the lower layer (32) of the plant fiber non-woven fabric;

a regular or irregular curved spunlace fabric (33) is arranged between the upper plant fiber non-woven fabric layer (31) and the lower plant fiber non-woven fabric layer (32), and the curve of the spunlace fabric (33) comprises an upper concave inflection point (331) which is abutted against the upper plant fiber non-woven fabric layer (31) and a lower concave inflection point (332) which is abutted against or not abutted against the lower plant fiber non-woven fabric layer (32);

and a cavity formed by the curved spunlace cloth (33) and the plant fiber non-woven fabric lower layer (32) is filled with high-molecular water-absorbent resin.

2. A core as claimed in claim 1, wherein: concave inflection point (332) with plant fiber non-woven fabrics lower floor (32) do not offset, be provided with guiding gutter (39) between the adjacent curve extreme low position of spunlace fabric (33).

3. A core as claimed in claim 2, wherein: the diversion trench (39) is of a funnel-shaped structure and comprises a wide-mouth cavity (391) with an inverted trapezoid upper section and a rectangular cavity (392) with a rectangular lower section.

4. A core as claimed in claim 3, wherein: fluffy non-woven fabric layers (38) are arranged at the top and the bottom of the rectangular cavity (392) of the flow guide groove (39) in the longitudinal direction.

5. A core as claimed in claim 4, wherein: the height H1 of the fluffy non-woven fabric layer (38) arranged in the longitudinal direction of the upper concave inflection point (331) and the top of the diversion trench (39) is 2.5-3.5 cm; the core body length is 100-120 cm; the distance between two adjacent upper concave inflection points is 8-12 mm; the maximum diameter D1 of the wide-mouth cavity (391) is 1-1.5 cm; the diameter D2 of the rectangular cavity (392) is 0.2-0.5 cm.

6. A core as claimed in claim 1, wherein: the concave inflection point (332) is abutted against the lower layer (32) of the plant fiber non-woven fabric; a first wave area (310) with the highest point being two upper concave inflection points (331) and the lowest point being one lower concave inflection point (332) is arranged between the plant fiber non-woven fabric upper layer (31) and the spunlace fabric (33), and more than two first wave areas (310) form a first water-locking high-molecular water-absorbing resin layer (34);

plant fiber non-woven fabrics lower floor (32) with be provided with between spunlace cloth (33) including the peak be one go up concave inflection point (331) and the minimum be second wave district (320) of two concave inflection points (332), more than two second wave district (320) constitutes second lock water macromolecule absorbent resin layer (35).

7. A core as claimed in claim 6, wherein: the height between the upper concave inflection point and the lower concave inflection point is 2-4 mm; the distance between two adjacent upper concave inflection points is 10-20 mm; different pitches of the first wave regions (310) are equal, and different pitches of the second wave regions (320) are equal; the first water-locking high polymer water-absorbing resin layer (34) and the second water-locking high polymer water-absorbing resin layer (35) are equal in depth.

8. A production line for cores as claimed in any one of claims 1 to 7, characterized by comprising a first winding wheel (51), said first winding wheel (51) being associated with a first structural glue gun for spraying glue (56);

the second winding wheel (52), the second winding wheel (52) is connected with a third winding wheel (53); and the second winding wheel (52) and the third winding wheel (53) are directly provided with a second structural adhesive spray gun (54) and a circular concave-convex die (55).

9. A method of making a core according to any of claims 1 to 7, comprising the steps of:

step S1, preparing plant fiber non-woven fabric, and leading out the plant fiber non-woven fabric through a second winding wheel (52) to form a plant fiber non-woven fabric lower layer (32);

step S2, the plant fiber non-woven fabric lower layer (32) passes through a second structural adhesive spray gun (54), and the plant fiber non-woven fabric lower layer (32) after adhesive spraying is obtained after adhesive spraying; preparing a spunlace fabric (33), leading the spunlace fabric out through a third winding wheel (53), passing through a circular concave-convex die (55), and pressing and bonding the spunlace fabric with the sprayed vegetable fiber non-woven fabric lower layer (32) to form the spunlace fabric (33) with a wavy curve shape;

step S3, directly applying a second water-locking SAP material to a second wave zone (320) formed between the lower layer (32) of the plant fiber non-woven fabric and the spunlace fabric (33) and including an upper concave inflection point (331) as the highest point and two lower concave inflection points (332) as the lowest point to form a second water-locking SAP layer (35);

step S4, the plant fiber non-woven fabric led out by the first winding wheel (51) passes through the polymer sweeping wheel and then is sprayed with glue (56) by the first structural glue spray gun to form a plant fiber non-woven fabric upper layer (31);

step S5, applying a first water-locking SAP material to a first wave zone (310) formed by two upper concave inflection points (331) and a lowest concave inflection point (332) formed by the upper layer (31) of the plant fiber non-woven fabric and the spunlace fabric (33) to form a first water-locking SAP layer (34).

10. Use of a core according to any of claims 1-7, wherein: the core body (3) is used for preparing sanitary care products, a non-woven fabric layer (2) is arranged above the core body (3), and a 3D embossed composite surface layer (1) is arranged above the non-woven fabric layer (2); a bottom film layer (4) is arranged below the core body (3);

the 3D embossing composite surface layer (1) comprises an upper weak hydrophilic fiber non-woven fabric first composite layer and a lower multi-hydrophilic fiber non-woven fabric second composite layer;

the non-woven fabric layer (2) is provided with a hydrophobic fabric layer (21) with hydrophobic performance, and one surface of the hydrophobic fabric layer (21) is provided with a hydrophilic channel flow guide layer (22) extending longitudinally

The surface of the hydrophilic channel flow guide layer (22) of the hydrophobic fabric layer (21) is adjacent to the upper surface of the lower multi-hydrophilic fiber non-woven fabric layer.