ABSORBENT CORE WITH EFFICIENT FLOW GUIDE PROPERTY AND BREATHABILITY, AND MANUFACTURING METHOD THEREOF

Abstract

An absorbent core with an efficient flow guide property and breathability, and method for manufacturing same. The absorbent core comprises a surface layer, a bottom layer, and an absorbent layer between the surface layer and the bottom layer; the absorbent layer comprises a non-woven fabric layer attached to the lower surface of the surface layer; a super absorbent polymer is uniformly scattered in the non-woven fabric layer; the surface layer and the non-woven fabric layer are attached to each other to form a composite layer; a flow guide groove is formed on the composite layer and divides the absorbent core into a plurality of absorbent regions; the composite layer with the flow guide groove is connected with the upper surface of the bottom layer; a super absorbent polymer is uniformly scattered between the bottom surface of the non-woven fabric layer and the upper surface of the bottom layer.

Claims

1. An absorbent core with efficient flow guide property and breathability, comprising a surface layer, a bottom layer and an absorbent layer between the surface layer and the bottom layer, wherein the absorbent layer comprises a non-woven fabric layer attached to the lower surface of the surface layer, and a super absorbent polymer is uniformly scattered in the non-woven fabric layer; the surface layer is attached to the non-woven fabric layer to form a composite layer, a flow guide groove is formed in the composite layer, and the flow guide groove divides the core into a plurality of absorbent regions; the composite layer with the flow guide groove is connected with the upper surface of the bottom layer; a super absorbent polymer is uniformly scattered between the lower surface of the non-woven fabric layer and the upper surface of the bottom layer.

2. The absorbent core with efficient flow guide property and breathability according to claim 1, wherein the non-woven fabric layer comprises a first non-woven fabric layer and a second non-woven fabric layer (62) located below the first non-woven fabric layer, a first super absorbent polymer is uniformly scattered in the first non-woven fabric layer, a second super absorbent polymer is uniformly scattered in the second non-woven fabric layer, and a third super absorbent polymer is uniformly scattered between the lower surface of the second non-woven fabric layer and the bottom layer; and an air passage is formed between the first non-woven fabric layer and the second non-woven fabric layer.

3. The absorbent core with efficient flow guide property and breathability according to claim 2, wherein the liquid absorption speeds of the first, second, and third super absorbent polymers gradually increase successively to form a gradient difference while the liquid absorption speeds increase from top to bottom.

4. The absorbent core with efficient flow guide property and breathability according to claim 1, wherein the flow guide groove is S-shaped or linear.

5. The absorbent core with efficient flow guide property and breathability according to claim 1, wherein the attachment manner of the surface layer and the non-woven fabric layer is one or more of hot rolling, ultrasonic bonding, seaming and adhesive bonding.

6. The absorbent core with efficient flow guide property and breathability according to claim 1, wherein the connection mode between the composite layer with the flow guide groove and the bottom layer is adhesive bonding; and the flow guide groove is made by thermal bonding.

7. A manufacturing method of the absorbent core with efficient flow guide property and breathability according to claim 1, comprising the following steps: (a) uniformly scattering the super absorbent polymer in the voids of the non-woven fabric layer, and attaching the non-woven fabric layer to the surface layer to form the composite layer, wherein the attachment manner is one or more of hot rolling, ultrasonic bonding, seaming and adhesive bonding; (b) preheating the composite layer in step (a) through a preheating device to 30-150 C.; (c) processing the flow guide groove on the preheated composite layer by means of thermal bonding; (d) uniformly scattering the super absorbent polymer on the lower surface of the composite non-woven fabric layer, and attaching the lower surface to the bottom layer via adhesive bonding; and (e) performing ultrasonic slitting or hot slitting, and then performing coiling.

8. The manufacturing method according to claim 7, wherein the non-woven fabric layer comprises a first non-woven fabric layer and a second non-woven fabric layer located below the first non-woven fabric layer, a first super absorbent polymer is uniformly scattered in the first non-woven fabric layer, a second super absorbent polymer is uniformly scattered in the second non-woven fabric layer, and a third super absorbent polymer is uniformly scattered between the lower surface of the second non-woven fabric layer and the bottom layer; and correspondingly, in step (a), the step of attaching the non-woven fabric layer to the surface layer to form the composite layer can be specifically decomposed into: (a1) uniformly scattering the first super absorbent polymer in the voids of the first non-woven fabric layer, and attaching the first non-woven fabric layer to the surface layer; and (a2) uniformly scattering the second super absorbent polymer in the voids of the second non-woven fabric layer, and stacking the second non-woven fabric layer and the first non-woven fabric layer; the surface layer, the first non-woven fabric layer and the second non-woven fabric layer constitute the composite layer in the step (a), and an air passage is formed between the first non-woven fabric layer and the second non-woven fabric layer by a glue-free process; and the liquid absorption speeds of the first, second, and a third super absorbent polymer gradually increase successively to form a gradient difference while the liquid absorption speeds increase from top to bottom.

9. The manufacturing method according to claim 7, wherein the preheating mode in the step (b) is one or more of infrared, hot air and ultrasonic waves, and the heating temperature is 80 C.

10. The manufacturing method according to claim 7, wherein the flow guide groove in the step (c) is processed by hot rolling, the surface temperature of a lower roll is lower than the surface temperature of an upper roll, the surface temperature of the upper roll is 80-180 C., and the surface temperature of the lower roll is 30 to 90 C., and the rolling speed is 50-150 m/min.

11. The manufacturing method according to claim 8, wherein the preheating mode in the step (b) is one or more of infrared, hot air and ultrasonic waves, and the heating temperature is 80 C.

12. The manufacturing method according to claim 8, wherein the flow guide groove in the step (c) is processed by hot rolling, the surface temperature of a lower roll is lower than the surface temperature of an upper roll, the surface temperature of the upper roll is 80-180 C., and the surface temperature of the lower roll is 30 to 90 C., and the rolling speed is 50-150 m/min.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The present invention is further illustrated below in combination with the drawings.

[0054] FIG. 1 is a structural diagram of an absorbent core in the prior art.

[0055] FIG. 2 is a structural diagram of another absorbent core in the prior art.

[0056] FIG. 3 is a top view of an absorbent core in embodiment 1 of the present invention.

[0057] FIG. 4 is a sectional view of the absorbent core in embodiment 1 of the present invention.

[0058] FIG. 5 is a process block diagram of the absorbent core in embodiment 1 of the present invention.

[0059] FIG. 6 is a sectional view of an absorbent core in embodiment 2 of the present invention.

[0060] FIG. 7 is a process block diagram of the absorbent core in embodiment 2 of the present invention.

[0061] FIG. 8 is a top view of an absorbent core in embodiment 3 of the present invention.

[0062] Reference signs: 1airlaid paper, 2non-woven fabric middle layer, 3SAP, 4surface layer, 5bottom layer, 6non-woven fabric layer, 7flow guide groove, 9first super absorbent polymer, 10second super absorbent polymer, 11third super absorbent polymer, 12air passage, 13fluff pulp, 61first non-woven fabric layer, and 62second non-woven fabric layer.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiment 1

[0063] As shown in FIGS. 3 to 5, an absorbent core with efficient flow guide property and breathability includes a surface layer 4, a bottom layer 5 and an absorbent layer between the surface layer 4 and the bottom layer 5. The absorbent layer includes a non-woven fabric layer 6 attached to the lower surface of the surface layer 4, and a super absorbent polymer is uniformly scattered in the non-woven fabric layer 6.

[0064] The surface layer 4 is attached to the non-woven fabric layer 6 to form a composite layer, a s-shaped flow guide groove 7 is formed in the composite layer, and the flow guide groove 7 divides the core into a plurality of absorbent regions.

[0065] The composite layer with the flow guide groove 7 is connected with the upper surface of the bottom layer 5.

[0066] A super absorbent polymer is uniformly scattered between the lower surface of the non-woven fabric layer 6 and the upper surface of the bottom layer 5.

[0067] The attachment manner of the surface layer 4 and the non-woven fabric layer 6 is one or more of hot rolling, ultrasonic bonding, seaming and adhesive bonding.

[0068] The connection mode between the composite layer with the flow guide groove 7 and the bottom layer 5 is adhesive bonding. The flow guide groove 7 is made by thermal bonding.

[0069] Correspondingly, the embodiment further provides a manufacturing method of the absorbent core with efficient flow guide property and breathability, which is characterized by including the following steps:

[0070] (a) uniformly scattering the super absorbent polymer in the voids of the non-woven fabric layer 6, and attaching the non-woven fabric layer 6 to the surface layer 4 to form the composite layer, wherein the attachment manner is one or more of hot rolling, ultrasonic bonding, seaming and adhesive bonding;

[0071] (b) preheating the composite layer in step (a) through a preheating device to 30-150 C.;

[0072] (c) processing the flow guide groove 7 on the preheated composite layer by means of thermal bonding;

[0073] (d) uniformly scattering the super absorbent polymer on the lower surface of the composite non-woven fabric layer 6, and attaching the lower surface to the bottom layer 5 via adhesive bonding; and

[0074] (e) performing ultrasonic slitting or hot slitting, and then performing coiling.

[0075] The preheating mode in the step (b) is one or more of infrared, hot air and ultrasonic waves, and the heating temperature is 80 C.

[0076] The flow guide groove 7 in the step (c) is processed by hot rolling, the surface temperature of a lower roll is lower than the surface temperature of an upper roll, the surface temperature of the upper roll is 80-180 C., and the surface temperature of the lower roll is 30 to 90 C., and the rolling speed is 50-150 m/min.

[0077] In the above-mentioned method, the surface layer, the non-woven fabric layer and the bottom layer are not thermally bonded together, but some of the layers are firstly composited because bonding all the layers together needs a higher temperature and more heat, which causes the non-woven fabric layer to be severely plasticized, resulting in poor hand feeling.

[0078] The purpose of preheating is to reduce the temperature difference during the hot rolling, better reduce the degree of plasticization and improve the hand feeling.

[0079] The flow guide groove 7 divides the core into a plurality of absorbent regions, the core expands to form a mountain-like shape after the first time liquid absorption, and the liquid is naturally guided downward under the action of gravitational potential energy during the second time liquid absorption, thereby accelerating the liquid conduction.

[0080] Another benefit of dividing the core into a plurality of absorbent regions is that the SAP can be located in a relatively small space to prevent the SAP from shifting. In this way, more SAP can be added without using a large amount of hot melt adhesive, and no graininess is generated.

[0081] As more SAP is added between the lower surface of the non-woven fabric layer 6 and the upper surface of the bottom layer 5, it is beneficial for the multiple-time absorption of the core.

[0082] The ultrasonic slitting or hot slitting is used for integrating the materials of the cut edges, reducing the possibility of the SAP leaking from the sides of the core, and eliminating the SAP leakage during the use of the finished product, and ensuring soft hand feeling at the same time.

Embodiment 2

[0083] As shown in FIGS. 6 to 7, embodiment 1 is repeated except for the difference that the non-woven fabric layer 6 includes a first non-woven fabric layer 61 and a second non-woven fabric layer 62 located below the first non-woven fabric layer 61. A first super absorbent polymer 9 is uniformly scattered in the first non-woven fabric layer 61. A second super absorbent polymer 10 is uniformly scattered in the second non-woven fabric layer 62. A third super absorbent polymer 11 is uniformly scattered between the lower surface of the second non-woven fabric layer 62 and the bottom layer 5.

[0084] Correspondingly, in step (a), the step of attaching the non-woven fabric layer 6 to the surface layer 4 to form the composite layer can be specifically decomposed into:

[0085] (a1) uniformly scattering the first super absorbent polymer 9 in the voids of the first non-woven fabric layer 61, and attaching the first non-woven fabric layer 61 to the surface layer 4; and

[0086] (a2) uniformly scattering the second super absorbent polymer 10 in the voids of the second non-woven fabric layer 62, and stacking the second non-woven fabric layer 62 and the first non-woven fabric layer 61;

[0087] the surface layer 4, the first non-woven fabric layer 61 and the second non-woven fabric layer 62 constitute the composite layer in the step (a), and an air passage 12 is formed between the first non-woven fabric layer 61 and the second non-woven fabric layer 62 by a glue-free process. Prior to liquid absorption, the air passage functions for ventilating and preventing stuffiness during wearing, and can provide a sufficient expansion space for the SAP after liquid absorption.

[0088] The first, second, and third super absorbent polymers have different model numbers, and the liquid absorption speeds of the first, second, and third super absorbent polymers gradually increase successively to form a gradient difference while the liquid absorption speeds increase from top to bottom.

[0089] The SAP of different model numbers are placed in multiple layers, thereby reducing the pile-like graininess of the SAP due to movement, the position and amount of SAP can be selected according to the characteristics of SAP to adjust the absorption speed, the dryness and the like of the core, and the designability of the core performance is enhanced.

Embodiment 3

[0090] As shown in FIG. 8, embodiment 1 or 2 is repeated except for the difference that the flow guide groove 7 is linear.