CN111688307A

CN111688307A - Core body capable of preventing particles from sliding and preparation method thereof

Info

Publication number: CN111688307A
Application number: CN202010541023.9A
Authority: CN
Inventors: 靳向煜; 王一行; 沈嘉俊; 吴海波
Original assignee: Donghua University
Current assignee: Donghua University; National Dong Hwa University
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2020-09-22

Abstract

The invention discloses a core body for preventing particles from sliding and a preparation method thereof. The core body comprises a core body surface layer made of non-woven materials, a super absorbent layer made of SAP particles and a core body bottom layer made of non-woven materials, and is characterized in that the non-woven materials adopted by the core body surface layer and the core body bottom layer form transverse diversion trenches for diffusion through directional arrangement of fibers or the transverse diversion trenches are prepared on the surfaces of the transverse diversion trenches; the super absorbent layer is formed by laying SAP particles or by mixing and laying SAP particles and wood pulp fibers. The preparation method comprises the steps of preparation of the core surface layer, preparation of the core bottom layer, preparation of the super absorbent layer, multilayer compounding of the core material and the like. The upper and lower hairiness layers in the core body prepared by the invention effectively fix SAP to prevent the SAP from sliding and accumulating, and the hairiness has better water absorption and water guide effects, so that the gel blocking phenomenon can not be generated, and the final product is soft and comfortable and has good absorption performance.

Description

Core body capable of preventing particles from sliding and preparation method thereof

Technical Field

The invention relates to a core body for preventing particles from sliding and a preparation method thereof, belonging to the technical field of core bodies of sanitary absorbent articles.

Background

Along with the economic development and the improvement of living standard, disposable sanitary absorption articles are more and more common in daily life, and the requirements of people on the performance of the disposable sanitary absorption articles are higher and higher. The core body is used as the core of the absorbent article, and the performance of the core body directly determines the final quality of the product.

The major sanitary absorbent core materials currently on the market are broadly divided into two types. One is a traditional cotton core, i.e. a core of fluff pulp mixed with super absorbent resin (SAP), which is relatively thick and heavy and has been gradually replaced by composite cores. The novel composite core body is composed of dust-free paper, fluffy non-woven fabric and dust-free paper from top to bottom, a layer of SAP is added between the dust-free paper and the non-woven fabric, and the dust-free paper, the fluffy non-woven fabric and the dust-free paper are bonded through hot melt adhesive. The composite core is reduced in thickness compared to a cotton core, but has a phenomenon that the SAP absorbs water to form gel and is blocked.

The SAP of the two core structures is distributed in a plane in the core, the content of the added SAP is limited, a large amount of added SAP has obvious granular sensation, and the SAP slides, so that core layering and SAP sliding accumulation are easy to occur, the SAP is unevenly distributed, the dosage of the hot melt adhesive is required to be increased when the large amount of SAP is added, the absorbability and air permeability are reduced due to excessive hot melt adhesive, the hand feeling is poor, and the final performance of the product is not facilitated.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the existing core has the technical problems of obvious granular sensation, easy sliding of granules and the like.

In order to solve the problems, the invention is realized by the following technical scheme:

a core for preventing particles from sliding sequentially comprises a core surface layer made of non-woven materials, a super-absorbent layer made of SAP particles and a core bottom layer made of non-woven materials, and is characterized in that the non-woven materials adopted by the core surface layer and the core bottom layer form transverse diversion trenches for diffusion through directional arrangement of fibers or are provided with the transverse diversion trenches on the surfaces; the super absorbent layer is formed by laying SAP (polyacrylate resin) particles or by mixing and laying SAP particles and wood pulp fibers; the core surface layer and the core bottom layer are compounded by ultrasonic bonding. Through single-side needling or single-side fuzzing treatment, the formed surface has a rough surface structure of the fluff, the structure can effectively prevent SAP particles from sliding and stacking, the formed fiber fluff can well play a role in vertical flow guide and can prevent the fiber fluff from sliding and stacking, the fluff inserted into the SAP can play a good role in water absorption and guide, the absorption effect of the SAP on water is accelerated, and the gel blocking phenomenon cannot be generated.

Preferably, the non-woven materials adopted by the core surface layer and the core bottom layer are made of chemical fibers and/or natural fibers by different non-woven technologies; the core surface layer adopts non-woven fabrics made by hot air, spunlace and needle punching technologies or fluffy fiber nets without reinforcement; the core bottom layer is made of non-woven fabric made by hot air, water jet, needle punching or spun bonding technology or is made of loose fiber web without reinforcement.

More preferably, the unconsolidated lofty nonwoven web is a straight laid web, a cross-laid web, or an air-laid web.

More preferably, the fiber adopted by the non-woven material adopted by the core surface layer is at least one of hydrophilic polypropylene, polyethylene, terylene, ES fiber, cotton and viscose, and the surface density of the fiber is 50-150 g/m²(ii) a The non-woven material adopted by the core body bottom layer adopts at least one of polypropylene, polyethylene, terylene, ES fiber, cotton and viscose, and the surface density of the non-woven material is 30-150 g/m²。

Preferably, the length and density of the single-sided hairiness structure of the non-woven material adopted by the core surface layer and the core bottom layer are adjusted by changing the needling frequency and the needling depth of the needling machine and the rotating speed of the carding roller.

Preferably, the SAP particles in the super absorbent layer comprise one or more hydrophilic resin particles with different shapes and different absorption capacities, the diameter of the SAP particles is 150-300 meshes, and the surface density of the super absorbent layer is 20-150 g/m²。

Preferably, the upper layer of non-woven material can play a certain role in transverse diversion through the oriented arrangement of fibers, and can also play a role in transverse diversion through the preparation of diversion trenches on the surface of the upper layer of non-woven material.

Preferably, the transverse guide grooves are formed by hot rolling through a patterned roller or by ultrasonic bonding, and the transverse guide grooves are in a linear shape, a curved shape, a diamond shape or a honeycomb shape.

The invention also provides a preparation method of the core for preventing the particles from sliding, which is characterized by comprising the following steps:

step 1): preparing a core surface layer:

one or more of polypropylene, polyethylene, terylene, ES fiber, cotton and viscose are mixed, and the fiber web obtained by carding web formation or air-laid web formation is directly used for subsequent production and processing, or the prepared fiber web is made into non-woven fabric by hot air, spunlace, needle punching or spun bonding, or the finished hot air, spunlace, needle punching or spun bonding non-woven fabric is directly adopted;

step 2): preparing a core bottom layer:

mixing one or more of polypropylene, polyethylene, terylene, ES fibers, cotton and viscose, and carding to obtain a fiber web or air-laying to obtain a non-woven fabric which is directly used for subsequent production and processing, or reinforcing the prepared fiber web by hot air, spunlace and needle punching, or directly adopting the finished hot air, spunlace, needle punching or spun-bonded non-woven fabric;

step 3): preparing a super absorbent layer:

conveying the non-woven material coiled material of the core bottom layer to the lower part of a feeding hopper through a net conveying curtain, uniformly spreading one or more SAP particles or a mixture of the SAP particles and wood pulp fibers on the core bottom layer through a powder spreading device, then spreading the non-woven material coiled material of the core surface layer above the core bottom layer, then needling the core surface layer through a needling machine to generate hairiness on the lower surface of the core surface layer, and penetrating the hairiness into SAP particles to form a diversion trench, so as to obtain a multilayer core material;

step 4): multilayer compounding of core materials:

and (4) carrying out composite reinforcement on the multilayer core material.

Preferably, the composite reinforcement in the step 4) is specifically: and compounding the three layers of materials by a secondary needling process, and simultaneously achieving the effect of inserting hairiness on the upper layer and the lower layer in the middle layer, or compounding by a hot rolling, ultrasonic welding or hot melt adhesive bonding process. The finally core that forms has better vertical and horizontal water conservancy diversion effect, can effectually prevent SAP granule's slip simultaneously, avoids the gel to block up, and the core uses the back surface dry and comfortable fast, does not have the phenomenon of sticking together.

The invention provides a core production preparation process which has high diffusion and high absorption characteristics, can effectively inhibit particle sliding and avoid gel blocking, has reasonable product process design and comfortable and light product, can effectively fix SAP (super absorbent polymer) and prevents the SAP from generating larger sliding accumulation in the production and transportation processes, thereby ensuring uniform SAP distribution, simultaneously playing a good water guide role in hairiness of upper and lower layers, avoiding the gel blocking and ensuring that the final product has good absorptivity.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention has reasonable production process and simple structure, adopts the mode of fixing the SAP particles by the single-sided hairiness non-woven fabrics of the upper layer and the lower layer, inhibits the slippage of the SAP particles, does not need hot melt adhesive bonding, has soft and comfortable product, dry and comfortable surface after use, does not have the phenomenon of layering and lumping, and is more favorable for environmental protection.

2. In addition, the hairiness of the upper layer and the lower layer in the core body are inserted among the SAP particles, so that a good vertical flow guide effect can be achieved, the absorption of moisture can be accelerated, the gel blocking phenomenon can be prevented, and the final product has good water absorption and retention performance and less reverse osmosis amount.

3. The thickness of the absorption core body produced by the invention is reduced compared with the common core body, the softness is better, the problem of blockage caused by gel generated by the common core body is solved, the absorption performance of the SAP is utilized to the maximum extent, the amount of the SAP in production and processing is reduced, the production cost is reduced, and the wide market prospect is achieved.

Drawings

FIG. 1 is a schematic view of the processing equipment used in the core preparation method provided by the present invention;

FIG. 2 is a schematic view of a method of making a core provided by the present invention;

fig. 3 is a cross-sectional view of a core made in accordance with the present invention.

Detailed Description

In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

The process equipment adopted by the invention is shown in figures 1 and 2 and comprises a net supporting curtain, wherein a feeding device 1, an uncoiling machine 9 for uncoiling a core bottom coiled material, a carding machine 2 for carding the core bottom coiled material, a hot air machine 3 for reinforcing the core bottom fiber web, a fluffing mechanism 4 for fluffing a core bottom non-woven material, a feeding hopper 5 for paving SAP particles on the core bottom, a core surface coiled material 6, a needle machine 7 and an ultrasonic bonding device 8 are sequentially arranged along the conveying direction of the net supporting curtain.

The core obtained in examples 1-2 comprises a core surface layer 10 made of a nonwoven material, a super absorbent layer 11 made of SAP particles, and a core back layer 12 made of a nonwoven material in this order, as shown in fig. 3.

Example 1

A method for preparing a core for preventing particles from sliding (as shown in figure 1):

the fiber raw material selects hydrophilic ES fiber as the fiber raw material, the fiber is opened and carded by a carding machine 2, and the carded fiber web is reinforced by hot air by a hot air machine 3 to be made into the fiber web with the surface density of 50g/m²The surface of the hot-air non-woven fabric is treated by a raising mechanism 4 to form hairiness on the surface of the fabric to be used as a core bottom layer 12, SAP particles are spread by a feeding hopper 5 after the fabric is prepared, and the SAP particles can be uniformly spread on the lower layer of hot-air fabric through effective control. Then covered with 60g/m²The terylene and viscose mixed non-woven fabric roll (core surface layer coiled material 6), then the cloth unwound from the core surface layer coiled material 6 is subjected to needling action, the fluff is formed below the unwound cloth due to the needling characteristic and is inserted into the SAP particles in the middle layer under the needling action to form a super absorbent layer 11, and finally the super absorbent layer is ultrasonically bonded by an ultrasonic bonding device 8 with lattice-shaped patterns,finally, the structure with smooth upper and lower surfaces and SAP particles clamped by the hairiness in the middle is prepared, the SAP particles can be fixed in the two layers of cloth by the structure without hot melt adhesive bonding, and the final product is soft and comfortable and has excellent absorption performance.

Example 2

A method for preparing a core for preventing particles from sliding (as shown in fig. 2):

the production process is simplified by directly starting from the finished cloth, and 60g/m of the cloth is discharged from the unwinding machine 9²The spunlace fabric is treated by a raising mechanism as a bottom fabric to be used as a core bottom layer 12, and SAP particles are spread through a feeding hopper 5 after the spunlace fabric is prepared. Then covered with 60g/m²The mixed non-woven fabric book of polyester-cotton (core surface course coiled material 6), then carry out the acupuncture effect with the cloth that core surface course coiled material 6 unreeled was got off, make the cloth that unreels get off below form the filoplume through the acupuncture effect, and form super absorbent polymer layer 11 among the filoplume inserts the intermediate level SAP granule under the acupuncture effect, finally pass through 8 ultrasonic bonding of ultrasonic bonding device of banding decorative pattern again, this kind of production line is comparatively nimble, can change the variety and the grammes per square metre etc. of upper and lower floor's cloth appearance according to particular case, in order to satisfy different product demands.

The core manufactured in the above manner is shown in fig. 3, and includes a core surface layer 10 (i.e., an upper layer nonwoven material), a middle water-absorbing layer 11(SAP particles) and a core bottom layer 12 (i.e., a lower layer nonwoven material), wherein the upper and lower layer nonwoven materials are both single-sided hairiness structures, and the SAP particles are wrapped by the two layers of hairiness to fix the SAP particles and prevent the SAP particles from sliding, and simultaneously, the SAP particles can guide water rapidly and downwards, and the hairiness inserted into the SAP particles can well conduct water, so that gel blocking is avoided, and the water-absorbing effect of the SAP is maximized.

Claims

1. A core for preventing particles from sliding sequentially comprises a core surface layer (10) made of non-woven materials, a super absorbent layer (11) made of SAP particles and a core bottom layer (12) made of non-woven materials, and is characterized in that the non-woven materials adopted by the core surface layer (10) and the core bottom layer (12) form transverse diversion trenches for diffusion through directional arrangement of fibers or are provided with the transverse diversion trenches on the surfaces; the super absorbent layer (11) is formed by laying SAP particles or by mixing and laying SAP particles and wood pulp fibers; the core surface layer (10) and the core bottom layer (12) are made of non-woven materials through needling or fluffing treatment to enable the core surface layer and the core bottom layer to have a single-side hairiness structure, and then the core surface layer (10), the super-absorbent layer (11) and the core bottom layer (12) are compounded through ultrasonic bonding.

2. The core for preventing particle slippage according to claim 1, wherein the nonwoven material used for the core face layer (10) and the core bottom layer (12) is made of chemical fibers and/or natural fibers by different nonwoven technologies; the core surface layer (10) adopts non-woven fabrics made by hot air, spunlace and needle punching technologies or loose fiber webs which are not reinforced; the core bottom layer (12) is made of a nonwoven fabric made by hot air, water jet, needle punching or spun bonding technology or is made of a fluffy fiber web without reinforcement.

3. The particle slip resistant core as recited in claim 2 wherein said unconsolidated lofty nonwoven web is a straight laid web, a cross laid web or an air laid web.

4. The core for preventing particle sliding according to claim 2, wherein the non-woven material of the core surface layer (10) is at least one of hydrophilic polypropylene, polyethylene, terylene, ES fiber, cotton and viscose, and has an areal density of 50-150 g/m²(ii) a The non-woven material adopted by the core body bottom layer (12) adopts at least one of polypropylene, polyethylene, terylene, ES fiber, cotton and viscose, and the surface density of the non-woven material is 30-150 g/m²。

5. The core for preventing particle slippage according to claim 1, wherein the length and density of the single-sided hairiness structure of the nonwoven material used for the core surface layer (10) and the core bottom layer (12) are adjusted by changing the needling frequency and depth of the needling machine and the rotational speed of the needling rollers.

6. The particle slippage prevention core as recited in claim 1, wherein the SAP particles in the super absorbent layer (11) comprise one or more hydrophilic resin particles of different shapes and different absorption capacities, the SAP particles have a diameter of 150 to 300 mesh, and the super absorbent layer (11) has an areal density of 20 to 150g/m²。

7. The particle slip prevention core as claimed in claim 1, wherein the upper layer of nonwoven material is capable of lateral flow guidance through the directional arrangement of the fibers and also through the formation of channels on the surface thereof.

8. The particle slip prevention core as claimed in claim 1 wherein the transverse channels are formed by embossing or by ultrasonic bonding, the transverse channels being straight, curved, diamond or honeycomb.

9. A method for producing a particle slip prevention core as claimed in any one of claims 1 to 8, comprising the steps of:

step 1): preparation of the core surface layer (10):

step 2): preparation of the core bottom layer (12):

step 3): preparation of the super absorbent layer (11):

conveying the non-woven material coiled material of the core body bottom layer (12) to the lower part of a feeding hopper through a net conveying curtain, uniformly spreading one or more SAP particles or a mixture of the SAP particles and wood pulp fibers on the core body bottom layer (12) through a powder spreading device, then spreading the non-woven material coiled material of the core body surface layer (10) above the core body bottom layer (12), and then needling the core body surface layer (10) through a needling machine to generate hairiness on the lower surface of the core body surface layer (10) and pierce the hairiness among the SAP particles to form a diversion trench, so as to obtain a multilayer core body material;

step 4): multilayer compounding of core materials:

and (4) carrying out composite reinforcement on the multilayer core material.

10. The method for preparing a particle slip prevention core according to claim 9, wherein the composite reinforcement in the step 4) is specifically: and compounding the three layers of materials by a secondary needling process, and simultaneously achieving the effect of inserting hairiness on the upper layer and the lower layer in the middle layer, or compounding by a hot rolling, ultrasonic welding or hot melt adhesive bonding process.