阅读说明：本技术 一种具有导流扩散和防止颗粒滑动作用的芯体及制备方法 (Core with functions of guiding diffusion and preventing particles from sliding and preparation method ) 是由 靳向煜 沈嘉俊 王一行 吴海波 于 2020-04-17 设计创作，主要内容包括：本发明公开了一种具有导流扩散和防止颗粒滑动作用的芯体及制备方法。所述芯体从上至下依次包括上层非织造材料、SAP颗粒层、下层非织造材料。通过在下层非织造材料撒上SAP颗粒,再在上面铺上上层非织造材料叠合在一起,再喂入特殊排针的针刺机加固而成,并在芯体上设有不同形状的导流槽,此外所述芯体对现有的绒毛浆和SAP芯体进行了一定程度上的改进,有效解决了绒毛浆芯体起坨断层以及SAP颗粒易滚动的问题。本发明构造简单、设计合理以及生产便捷。(The invention discloses a core body with the functions of guiding flow, diffusing and preventing particles from sliding and a preparation method thereof. The core body sequentially comprises an upper layer of non-woven material, an SAP particle layer and a lower layer of non-woven material from top to bottom. The core body is formed by scattering SAP particles on a lower layer of non-woven material, laying an upper layer of non-woven material on the lower layer of non-woven material, overlapping the upper layer of non-woven material, feeding the non-woven material into a special needle-arranging needle machine for reinforcement, and arranging guide grooves with different shapes on the core body. The invention has simple structure, reasonable design and convenient production.)

1. The utility model provides a core with water conservancy diversion diffusion and prevent granule sliding action, top-down includes upper layer non-woven material, SAP granular layer, lower floor non-woven material in proper order, its characterized in that:

the upper layer of non-woven material is non-woven fabric made by any one of needling, spunlace and hot air technology or fiber web directly output by a carding machine or an air-laid machine; the upper layer of non-woven material is provided with a diversion trench;

the SAP particle layer is formed by laying water-absorbent resin particles;

the lower layer non-woven material is non-woven fabric made by any one of spun-bonding, hot air and spunlace technology or fiber web directly output by a carding machine or an air-laid machine;

the core body is formed by three layers of needling of an upper layer of non-woven material, an SAP particle layer and a lower layer of non-woven material, and fiber bundles formed by needling in the upper layer of non-woven material penetrate through the SAP particle layer and are entangled with the lower layer of non-woven material, and the fiber bundles are arranged in a rectangular shape along the length direction of the core body to form a lattice cage for fixing the SAP particles.

2. A core with the functions of guiding diffusion and preventing particle sliding as claimed in claim 1, wherein the upper layer non-woven material and the lower layer non-woven material are made of common chemical fibers and natural fibers by different non-woven technologies; the upper layer non-woven material is non-woven fabric made by needle punching, water jet, hot air technology or fiber web made by carding and air flow; the lower layer nonwoven is a nonwoven made by spunbond, hot air, hydroentangling techniques or a web made by carding and air-laying.

3. The core with the functions of guiding diffusion and preventing particle sliding as claimed in claim 2, wherein the fibers adopted by the upper layer of non-woven material are one of polypropylene and polyethylene and one of cotton and viscose, and the areal density of the core is 40-150 g/m²(ii) a The lower non-woven material adopts any one of polypropylene, polyethylene, viscose and cotton as fiber, and the surface density of the lower non-woven material is 10-60 g/m²。

4. The core with the functions of guiding the diffusion and preventing the particles from sliding as claimed in claim 1, wherein the SAP particle layer is a particle layer formed by stacking one or more water-absorbent resins with different shapes and different absorption capacities, and the particle diameter is 150-300 mesh.

5. A core having the functions of guiding the diffusion of particles and preventing the particles from slipping as claimed in claim 1, wherein said SAP particle layer is formed by uniformly spreading a hopper on the lower layer nonwoven material with water-absorbent resin particles present on the surface or inside thereof; the upper layer non-woven material and the lower layer non-woven material are consolidated together by a needle punching method; the diversion trench is made by hot rolling or point bonding or ultrasonic bonding.

6. The core for flow guiding and diffusion and particle sliding prevention according to claim 5, wherein the water-absorbent resin particles are held in the upper layer nonwoven material and the lower layer nonwoven material by a different needle arrangement pattern in which needle holes are arranged in a different shape of a lattice.

7. A core body with the functions of guiding diffusion and preventing particles from sliding according to claim 5, wherein the shape of the guiding grooves is polygonal, curved or petal-shaped.

8. The method for preparing the core with the functions of guiding diffusion and preventing particle sliding of any one of claims 1-7, is characterized by comprising the following steps:

step 1): preparation of the upper layer nonwoven material:

one of polypropylene and polyethylene and one of cotton and viscose are mixed, and the mixture is prepared into the fabric with the surface density of 40-150 g/m by needling, spunlace and hot air technology²The non-woven fabric is directly carded or air-laid to obtain the non-woven fabric with the surface density of 40-150 g/m²The web of (a);

step 2): preparation of the lower layer nonwoven:

the surface density of the material is 10-60 g/m by adopting any one of polypropylene, polyethylene, viscose and cotton and adopting the technologies of spun bonding, hot air and spunlace/8520²Or directly using the non-woven fabricThe surface density of the obtained product is 10-60 g/m by means of carding or air-laid²The web of (a).

Step 3): compounding of SAP particle layers:

the method comprises the following steps of enabling a prepared lower-layer non-woven material coiled material or a fiber web made by carding and air-laid to reach the lower part of an SAP hopper under the driving of a net conveying curtain, uniformly spreading SAP particles, then laying the prepared upper-layer non-woven material coiled material or the fiber web made by carding and air-laid on the upper part of a core bottom layer, feeding the core into a needle machine for needling composition, enabling a punched lattice cage type three-dimensional structure to be just capable of fixing the SAP particles in the core, and finally forming a diversion trench on the core in a hot rolling, point bonding or ultrasonic bonding mode.

9. The method for preparing a core with the functions of guiding diffusion and preventing particle sliding according to claim 8, wherein the needle arrangement rule of the needle machine in the step 3) is as follows: the needles of the first needle machine are arranged along the longitudinal direction along the production direction, and the distance between every two rows of needles is 2-10 cm; the needles of the second needle machine are arranged along the transverse direction, and the distance between every two rows of needles is 2-10 cm.

Technical Field

The invention relates to a preparation method of an absorption core body, and belongs to the technical field of disposable hygienic products.

Background

The absorption core body is the core structure of disposable sanitary products such as sanitary napkins, baby diapers and the like, most of composite core bodies used by commercially sold paper diapers and sanitary napkins are formed by mixing fluff pulp and super absorbent resin, but the core body has the big defect that super absorbent resin particles can roll in the core body, so that gel generated after liquid is absorbed is stacked and layered, and the comfort when the disposable sanitary napkins are worn is influenced. A large amount of hot melt adhesive is often added in order to keep the particles from slipping, and the excessive use of hot melt adhesive can make the product feel hard, and the liquid absorption speed and the air permeability can be affected.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: improves the existing composite core body technology and provides a core body with the functions of guiding flow, diffusing and preventing particles from sliding.

In order to solve the technical problems, the invention provides a core body with the functions of guiding flow, diffusing and preventing particles from sliding, which sequentially comprises an upper layer non-woven material, an SAP particle layer and a lower layer non-woven material from top to bottom, and is characterized in that:

the upper layer of non-woven material is non-woven fabric made by any one of needling, spunlace and hot air technology or fiber web directly output by a carding machine or an air-laid machine; the upper layer of non-woven material is provided with a diversion trench;

the SAP particle layer is formed by laying water-absorbent resin particles;

the lower layer non-woven material is non-woven fabric made by any one of spun-bonding, hot air and spunlace technology or fiber web directly output by a carding machine or an air-laid machine;

the core body is formed by three layers of needling of an upper layer of non-woven material, an SAP particle layer and a lower layer of non-woven material, and fiber bundles formed by needling in the upper layer of non-woven material penetrate through the SAP particle layer and are entangled with the lower layer of non-woven material, and the fiber bundles are arranged in a rectangular shape along the length direction of the core body to form a lattice cage for fixing the SAP particles.

Preferably, the upper and lower layers of nonwoven material are made of common chemical and natural fibers by different nonwoven technologies; the upper layer non-woven material is non-woven fabric made by needle punching, water jet, hot air technology or fiber web made by carding and air flow; the lower layer nonwoven is a nonwoven made by spunbond, hot air, hydroentangling techniques or a web made by carding and air-laying.

More preferablyThe upper layer of non-woven material adopts fibers of one of polypropylene and polyethylene and one of cotton and viscose, and the surface density of the fibers is 40-150 g/m²(ii) a The lower non-woven material adopts any one of polypropylene, polyethylene, viscose and cotton as fiber, and the surface density of the lower non-woven material is 10-60 g/m²。

Preferably, the SAP particle layer is a particle layer formed by stacking one or more water-absorbent resins with different shapes and different absorption capacities, and the particle diameter is 150-300 meshes.

Preferably, the SAP particle layer is formed by uniformly spreading the SAP particle layer on the lower nonwoven material with the water-absorbent resin particles present on the surface or inside thereof by means of a hopper; the upper layer non-woven material and the lower layer non-woven material are consolidated together by a needle punching method; the diversion trench is made by hot rolling, point bonding or ultrasonic bonding.

More preferably, the water-absorbent resin particles are held by lattices in which pinholes obtained by needling and reinforcing the upper layer nonwoven material and the lower layer nonwoven material in different needle arrangement patterns are arranged in different shapes.

More preferably, the shape of the diversion trench is polygonal, curved or petal-shaped

The invention also provides a preparation method of the core body with the functions of guiding diffusion and preventing particle sliding, which is characterized by comprising the following steps:

step 1): preparation of the upper layer nonwoven material:

one of polypropylene and polyethylene and one of cotton and viscose are mixed, and the mixture is prepared into the fabric with the surface density of 40-150 g/m by needling, spunlace and hot air technology²The non-woven fabric is directly carded or air-laid to obtain the non-woven fabric with the surface density of 40-150 g/m²The web of (a);

step 2): preparation of the lower layer nonwoven:

the surface density of the material is 10-60 g/m by adopting any one of polypropylene, polyethylene, viscose and cotton as a material and adopting the technologies of spun bonding, hot air and spunlace²The non-woven fabric is directly carded or air-laid to obtain the surface density10 to 60g/m²The web of (a).

Step 3): compounding of SAP particle layers:

the method comprises the following steps of enabling a prepared lower-layer non-woven material coiled material or a fiber web made by carding and air-laid to reach the lower part of an SAP hopper under the driving of a net conveying curtain, uniformly spreading SAP particles, then laying the prepared upper-layer non-woven material coiled material or the fiber web made by carding and air-laid on the upper part of a core bottom layer, feeding the core into a needle machine for needling composition, enabling a punched lattice cage type three-dimensional structure to be just capable of fixing the SAP particles in the core, and finally forming a diversion trench on the core in a hot rolling, point bonding or ultrasonic bonding mode.

Preferably, the needle arrangement rule of the needle machine in the step 3) is as follows: the needles of the first needle machine are arranged along the longitudinal direction along the production direction, and the distance between every two rows of needles is 2-10 cm; the needles of the second needle machine are arranged along the transverse direction, and the distance between every two rows of needles is 2-10 cm.

The composite core body is prepared by a non-woven composite technology, has good liquid absorption performance, and can effectively avoid the phenomenon of lump formation and fault generation caused by particle sliding.

Compared with the prior art, the invention has the following advantages:

1. the core body mainly comprises an upper layer non-woven material, an SAP particle layer and a lower layer non-woven material, and a grid with a regular shape formed by arranging needle holes left by needle punching is arranged on the core body, so that the SAP particle storage and fixing effect is achieved, and the SAP particle sliding is effectively prevented. Because the use of hot melt adhesive is reduced in the process, the product is softer and more comfortable to use, and is also beneficial to environmental protection.

2. In addition, the fiber entanglement and interpenetration generated by needling are favorable for quick flow guide of liquid through wicking action, the liquid diffusivity of the core body is improved, and meanwhile, the strong force provided by the needling holes can ensure that the SAP particles which expand after absorbing water are not propped open, so that a certain consolidation effect is achieved, and the core body is effectively prevented from being layered and lumping.

3. The diversion trench processed by the ultrasonic bonding mode not only firmly combines the upper and lower layers of non-woven materials together, but also well plays a role in diversion and diffusion of liquid, and greatly improves the absorption effect of the liquid.

The invention has simple design concept and simple production process, and is beneficial to reducing the cost and improving the efficiency.

Drawings

FIG. 1 is a top view of a core made in accordance with the present invention;

FIG. 2 is a cross-sectional view of a core made in accordance with the present invention;

FIG. 3 is a flow chart of a method of preparation provided by the present invention;

FIG. 4 is a schematic view of the process equipment employed in the present invention;

FIG. 5 is a schematic view of needle arrangement of a needle loom with longitudinal needle arrangement;

FIG. 6 is a schematic diagram of needle arrangement of the needle loom with transverse needle arrangement.

Detailed Description

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

The technological equipment adopted by the invention is shown in figures 3 and 4, and comprises a conveyor belt, and a core bottom layer carding machine 13 for finishing a core bottom layer coiled material 6, an SAP hopper 8 for paving SAP particles 9 on the core bottom layer 4, a core surface layer carding machine 14 for finishing a core surface layer coiled material 7, a first needle machine 10, a second needle machine 11 and an ultrasonic bonding device 12 are sequentially arranged along the conveying direction of the conveyor belt.