Diffusion type core body and sanitary towel

Abstract

The invention relates to the field of hygienic products, and provides a diffusion type core body and a sanitary napkin, which solve the defects of slow diffusion and infiltration speed of an absorption core body in the prior art, the diffusion type core body comprises an upper wrapping layer, an absorption layer and a lower wrapping layer, the upper wrapping layer is a low-diffusion type non-woven fabric, and the lower wrapping layer is a high-diffusion type non-woven fabric. The absorption layer is provided with penetrating pressing points penetrating through the absorption layer from the surface of the absorption layer, and the absorption layer is further provided with gradient embossing which enables diffusion of the absorption layer to be gradually enhanced from the center liquid discharging area to the front end and the rear end.

Description

Technical Field

[0001] The present invention relates to the field of sanitary products, in particular to a diffusion-type core and a sanitary napkin. Background Art

[0002] Sanitary napkins are disposable products designed to absorb menstrual fluid. Their core structure consists of an absorbent core material, typically made from a mixture of fluff pulp and a high-molecular-weight absorbent resin, then formed using a core forming machine. A freshly formed core, before further processing, typically has a high porosity within the space, resulting in a fluffy and soft core. The contact between wood pulp fibers transfers absorbed liquid between them through a capillary effect, creating a certain diffusion effect. However, this diffusion is limited by the inherent moisture absorption and water retention properties of the wood pulp fibers. Once the fibers themselves are saturated, liquid exceeding the saturation capacity will be transferred to the remaining fibers. Fibers in the lower liquid zone reach this saturation state first. At this point, the cohesive force of the liquid in the central lower liquid zone is greater, and the capillary force cannot pull the liquid outward from the center. Consequently, the accumulated liquid in the center is prone to seepage when squeezed, resulting in back osmosis. Therefore, the addition of absorbent resins can absorb and lock in liquid exceeding the saturation capacity, thereby reducing back osmosis. However, at this time, the infiltrating liquid is basically concentrated near the lower liquid area, the core diffusion efficiency is low, the utilization rate of the entire core is relatively low, and multiple absorption and saturation of the lower liquid area will also increase reverse osmosis and dampness.

[0003] Chinese Patent No. 201620939774.5 discloses a high-diffusion absorption core and an absorbent product containing the high-diffusion absorption core, including an absorption core, wherein the absorption core is composited from top to bottom by a dust-free paper surface layer, two absorption layers composed of at least an upper absorption layer and a lower absorption layer stacked layer by layer, and a dust-free paper bottom layer, wherein the upper absorption layer or the lower absorption layer is constructed by fibers interlaced, entangled, and embraced with each other to form a fiber network structure layer, and an absorption layer composed of super absorbent resin embedded and fixed between the fiber grids in the fiber network structure layer, the high-diffusion absorption core is composed of an absorption core and at least one liquid longitudinal diffusion guide groove, the absorption core surrounds the liquid longitudinal diffusion guide groove, the liquid longitudinal diffusion guide groove is a hollow structure, and at least penetrates the bottom surface of the upper absorption layer in a vertical direction downward from the surface of the upper absorption layer, and the longitudinal length of the liquid longitudinal diffusion guide groove is less than the longitudinal length of the high-diffusion absorption core. This patent allows the liquid to infiltrate faster by setting up longitudinal diffusion and diversion grooves, but it only improves the grooves in the absorption layer and does not involve the upper and lower wrapping layers of the absorption layer. The infiltration and diffusion of the liquid are also closely related to the upper and lower wrapping layers of the absorption layer. Summary of the Invention

[0004] Therefore, in order to solve the above problems, the present invention provides a diffusion core and a sanitary napkin to solve the defects of the prior art absorbent core in terms of slow diffusion and infiltration speed.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a diffusion-type core, comprising an upper wrapping layer, an absorption layer and a lower wrapping layer, the upper wrapping layer is a low-diffusion non-woven fabric, the lower wrapping layer is a high-diffusion non-woven fabric, the absorption layer is provided with a penetration pressure point that penetrates the absorption layer from the surface of the absorption layer, and the absorption layer is also provided with a gradient embossing that gradually enhances the diffusion of the absorption layer from the central lower liquid area to the front and rear ends.

[0006] Furthermore: the upper wrapping layer is a fast-seepage hot air non-woven fabric, which uses fibers with a diameter of 1.0-6.0 dtex as raw materials, and is treated with a hydrophilic oil agent to control the liquid-receiving performance of the fast-seepage hot air non-woven fabric. The gram weight of the fast-seepage hot air non-woven fabric is 10-30 gsm.

[0007] Furthermore: the high-diffusion non-woven fabric is a spunlace non-woven fabric, the spunlace non-woven fabric uses 10-30 μm long fibers as raw materials, and the gram weight of the spunlace non-woven fabric is 30-80 gsm.

[0008] Furthermore: the spunlace nonwoven fabric is obtained by using a direct laying process.

[0009] Furthermore: the lateral density of the spunlace non-woven fabric is distributed in a compartmentalized gradient. Specifically, the lateral density compartmentalized gradient distribution of the spunlace non-woven fabric is that the spunlace non-woven fabric obtains high-density stripes and low-density stripes distributed in a transverse direction through embossing treatment or one-piece forming treatment of the spunlace process. The width of the high-density stripes is 1-5 mm, and the width of the low-density stripes is 1-5 mm.

[0010] Furthermore: the penetrating pressure points are in the form of dots or lines, the diameter of the dots is 1-3 mm, the width of the lines is 1-3 mm, and the length of the lines is 3-15 mm.

[0011] Furthermore: the through pressure points have 3-10 rows distributed along the longitudinal direction.

[0012] Furthermore: the absorption layer is also provided with gradient embossing, and the embossing shape is any one of line type, X type, Y type, * type and grid type, the line length of the line type is 1-20mm, and the line width of the line type is 1-3mm.

[0013] A sanitary napkin comprises a liquid-permeable surface layer, an absorbent core and a liquid-impermeable bottom layer stacked in sequence from top to bottom, wherein the absorbent core adopts the diffusion-type core described above.

[0014] By adopting the above technical solution, the beneficial effects of the present invention are:

[0015] 1. The diffusion-type core of the present application is designed with a low-diffusion upper wrapping layer and a high-diffusion lower wrapping layer, thereby forming a diffusion performance from low diffusion to high diffusion, which can quickly guide the liquid to penetrate into the core area of ​​the absorption layer, and form a vertical diversion channel by penetrating the pressure points. Combined with the lateral diffusion gradient formed by the gradient embossing, the directional diffusion of the liquid from the central absorption area to the surrounding areas is achieved, thereby avoiding liquid reverse osmosis and improving the utilization rate of the absorption layer.

[0016] 2. The fast-permeable hot air non-woven fabric of the present application uses fibers with a diameter of 1.0-6.0 dtex as raw materials and has good penetration performance. The gram weight of the fast-permeable hot air non-woven fabric is 10-30 gsm, and it has high penetration performance. The fast-permeable hot air non-woven fabric can make the liquid penetrate quickly and is not easy to leave residual materials; the high-diffusion non-woven fabric uses spunlace non-woven fabric, and the capillary effect of the liquid in this structural layer is higher than the cohesive force of the liquid in the central area. At this time, the accumulated liquid in the central area can be discharged outward through the high-diffusion non-woven fabric. At the same time, the unsaturated absorption layer can also absorb the liquid discharged from the bottom diffusion layer again to achieve the absorption complementarity between the absorption layer and the diffusion layer.

[0017] 3. The spunlace nonwoven fabric of the present application is obtained by a direct laying process, which can achieve a better diffusion effect. The lateral density of the spunlace nonwoven fabric is adjusted in a differentiated gradient. Through embossing treatment or one-piece forming treatment of the spunlace process, the spunlace nonwoven fabric obtains high-density stripes and low-density stripes distributed laterally, so that the liquid diffuses preferentially along the high-density area, effectively preventing side leakage.

[0018] 4. The absorption layer is also provided with gradient embossing that gradually enhances the diffusion of the absorption layer from the central lower liquid area to the front and rear ends. By adjusting the depth of the embossing, the core density is segmented, so that the diffusion of the absorption layer reaches a better level. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the diffusion core structure in Example 1 of the present invention;

[0020] Figure 2 This is a distribution diagram of stripes of different densities in the transverse direction of the spunlace nonwoven fabric in Example 1 of the present invention;

[0021] Figure 3 This is the embossed pattern of the diffusion core in Example 1 of the present invention;

[0022] Figure 4 for Figure 3 A in the middle is an enlarged schematic diagram;

[0023] Figure 5 for Figure 3 Enlarged schematic diagram of point B in the middle. DETAILED DESCRIPTION

[0024] Example 1

[0025] refer to Figures 1 to 5 A diffusion-type core comprises an upper wrapping layer 1, an absorption layer 2 and a lower wrapping layer 3. The upper wrapping layer 1 is a low-diffusion non-woven fabric. Specifically, the low-diffusion non-woven fabric is a fast-permeation hot air non-woven fabric. The fast-permeation hot air non-woven fabric uses fibers with a diameter of 1.0-6.0 dtex as raw materials. The liquid-permeation performance of the fast-permeation hot air non-woven fabric is controlled by treating with a hydrophilic oil agent. The gram weight of the fast-permeation hot air non-woven fabric is 10-30 gsm. More specifically, in this embodiment, the gram weight of the fast-permeation hot air non-woven fabric is 20 gsm.

[0026] The lower wrapping layer 3 is a high-diffusion non-woven fabric. Specifically, the high-diffusion non-woven fabric is a spunlace non-woven fabric obtained by a direct laying process. The spunlace non-woven fabric uses 10-30μm long fibers as raw materials. The gram weight of the spunlace non-woven fabric is 60gsm. The transverse density of the spunlace non-woven fabric is distributed in a compartmentalized gradient. The transverse density compartmentalized gradient distribution of the spunlace non-woven fabric is specifically that the spunlace non-woven fabric is embossed through a process to obtain high-density stripes 6 and low-density stripes 7 that are distributed in a transverse direction. The width of the high-density stripes 6 is 1mm, and the width of the low-density stripes 7 is 2mm.

[0027] The absorption layer 2 is provided with penetration pressure points 4 that penetrate the absorption layer from the surface of the absorption layer 2. The penetration pressure points have 5 rows distributed along the longitudinal direction. The penetration pressure points are in the shape of lines. The line width of the line is 1 mm and the line length is 10 mm.

[0028] The absorption layer 2 is also provided with gradient embossing 5 that gradually enhances the diffusion of the absorption layer 2 from the central lower liquid area to the front and rear ends. The embossing 5 is in a grid shape with a grid line length of 5 mm and a width of 2 mm.

[0029] Example 2

[0030] A sanitary napkin comprises a liquid-permeable surface layer, an absorbent core and a liquid-impermeable bottom layer stacked in sequence from top to bottom, wherein the absorbent core adopts the diffusion-type core described in the first embodiment.

[0031] Example 3

[0032] A diffusion-type core comprises an upper wrapping layer, an absorption layer and a lower wrapping layer, wherein the upper wrapping layer is a low-diffusion non-woven fabric. Specifically, the low-diffusion non-woven fabric is a fast-permeation hot air non-woven fabric. The fast-permeation hot air non-woven fabric uses fibers with a diameter of 1.0-6.0 dtex as raw materials, and the liquid-permeation performance of the fast-permeation hot air non-woven fabric is controlled by treating with a hydrophilic oil agent. The gram weight of the fast-permeation hot air non-woven fabric is 10-30 gsm. More specifically, in this embodiment, the gram weight of the fast-permeation hot air non-woven fabric is 25 gsm.

[0033] The preparation process of the fast-seepage hot air non-woven fabric in this embodiment is as follows: using 1.0-6.0 dtex fibers as raw materials, preparing a hydrophilic oil agent, wherein the hydrophilic oil agent consists of 68 parts by weight of polyoxyethylene ether, 30 parts by weight of polyethylene glycol ester, 1 part by weight of antistatic agent, and 1 part by weight of chitosan derivative antibacterial agent. After the fibers are webbed, a fiber web is obtained, and the fiber web is immersed in a treatment tank containing the hydrophilic oil agent for 10 seconds. The liquid temperature in the immersion tank is controlled at 45°C. The fiber web treated with the hydrophilic oil agent is then hot-air dried for 50 seconds. The hot air temperature is controlled at 115°C, and then matte treated to obtain a fast-seepage hot air non-woven fabric.

[0034] The lower wrapping layer is a high-diffusion non-woven fabric. Specifically, the high-diffusion non-woven fabric is a spunlace non-woven fabric obtained by a direct laying process. The spunlace non-woven fabric uses 10-30μm long fibers as raw materials. The gram weight of the spunlace non-woven fabric is 30-80gsm. The transverse density of the spunlace non-woven fabric is distributed in a compartmentalized gradient. The transverse density compartmentalized gradient distribution of the spunlace non-woven fabric is specifically that the spunlace non-woven fabric is processed into an integrated form through a spunlace process to obtain high-density stripes and low-density stripes distributed in a transverse direction. The width of the high-density stripes is 1-5mm, and the width of the low-density stripes is 1-5mm.

[0035] In this embodiment, the specific process of the one-piece forming by the spunlace process is as follows:

[0036] The fiber web after laying is spunlace treated in the spunlace area. The spunlace area is divided into a high-pressure area, a transition area and a low-pressure area. The spunlace pressure in the high-pressure area is 20 MPa, the water needle angle is 90°, and the water flow rate is controlled at 2 L / min˙m 2 The water pressure in the low-pressure area is 10Mpa, the water needle angle is 45°, and the water flow rate is controlled at 1L / min˙m 2 The transition zone is entered by alternating water spunlace needles from the high-pressure zone and the low-pressure zone.

[0037] The absorption layer is provided with penetrating pressure points that penetrate the absorption layer from the surface of the absorption layer, and the absorption layer is also provided with gradient embossing that gradually enhances the diffusion of the absorption layer from the central lower liquid area to the front and rear ends.

[0038] Gradient embossing is achieved by controlling the depth of the grooves produced by the embossing roller.

[0039] Among them, in the present invention, the penetrating pressure points are dot-shaped or line-shaped, the dot diameter is 1-3mm, the line width of the line is 1-3mm, the line length is 3-15mm, the penetrating pressure points have 3-10 rows distributed along the longitudinal direction, the embossing shape is any one of line type, X type, Y type, * type and grid type, the line length of the line type is 1-20mm, and the line width of the line type is 1-3mm; the purpose of the present invention can be achieved within the above parameter range.

[0040] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A diffusion core, comprising an upper wrapping layer, an absorption layer and a lower wrapping layer, characterized in that: The upper wrapping layer is a low-diffusion non-woven fabric, the lower wrapping layer is a high-diffusion non-woven fabric, the absorption layer is provided with a penetration pressure point that penetrates the absorption layer from the surface of the absorption layer, and the absorption layer is also provided with a gradient embossing that gradually enhances the diffusion of the absorption layer from the central lower liquid area to the front and rear ends.

2. A diffuser core according to claim 1, characterized in that: The upper wrapping layer is a fast-seeping hot air non-woven fabric, which uses fibers with a diameter of 1.0-6.0 dtex as raw materials. The liquid-absorbing performance of the fast-seeping hot air non-woven fabric is controlled by treating it with a hydrophilic oil agent. The gram weight of the fast-seeping hot air non-woven fabric is 10-30 gsm.

3. The diffuser core according to claim 1, characterized in that: The high-diffusion non-woven fabric is a spunlace non-woven fabric, which uses 10-30 μm long fibers as raw materials and has a gram weight of 30-80 gsm.

4. A diffuser core according to claim 3, characterized in that: The spunlace nonwoven fabric is obtained by adopting a direct laying process.

5. A diffuser core according to claim 3, characterized in that: The transverse density of the spunlace non-woven fabric is distributed in a compartmentalized gradient. Specifically, the transverse density compartmentalized gradient distribution of the spunlace non-woven fabric is that the spunlace non-woven fabric obtains high-density stripes and low-density stripes distributed in a transverse direction through embossing treatment or one-piece forming treatment of the spunlace process. The width of the high-density stripes is 1-5 mm, and the width of the low-density stripes is 1-5 mm.

6. The diffuser core according to claim 1, characterized in that: The through pressure points are in the shape of dots or lines, the diameter of the dots is 1-3 mm, the width of the lines is 1-3 mm, and the length of the lines is 3-15 mm.

7. The diffuser core according to claim 6, characterized in that: The through pressure points have 3-10 rows distributed along the longitudinal direction.

8. The diffuser core according to claim 1, characterized in that: The absorption layer is also provided with gradient embossing, and the embossing shape is any one of line type, X type, Y type, * type and grid type. The line length of the line type is 1-20mm, and the width of the line type is 1-3mm.

9. The diffuser core according to claim 2, characterized in that: The fast-permeability hot air nonwoven fabric is prepared by carding 1.0-6.0 dtex fibers into a web, then heating and consolidating the web with hot air. The fibers are then treated with a hydrophilic oil to enhance their hydrophilicity. The hydrophilic oil comprises 60-70 parts by weight of a polyoxyethylene ether, 20-30 parts by weight of a polyethylene glycol ester, 1-1.5 parts by weight of an antistatic agent, and 0.5-1 part by weight of a chitosan derivative antibacterial agent. The fiber web is immersed in a treatment tank containing the hydrophilic oil for 10-15 seconds, with the liquid temperature in the tank controlled at 40-50°C. The treated fiber web is then dried with hot air for 40-60 seconds, with the hot air temperature controlled at 110-125°C, to obtain the fast-permeability hot air nonwoven fabric.

10. A sanitary napkin comprising a liquid-permeable surface layer, an absorbent core, and a liquid-impermeable backing layer stacked in order from top to bottom, characterized in that: The absorbent core adopts the diffusion-type core according to any one of claims 1 to 9.

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