A wet state anti-delamination absorbent composite material and a production process thereof

Abstract

The application relates to a wet-state anti-layering absorbent composite material and a production process, which comprises a surface layer, an absorbent layer and a bottom layer. The absorbent layer comprises SAP particles, the SAP particles are located between the surface layer and the bottom layer, and the SAP particles are at least adhered to the surface layer or the bottom layer. The application has the advantages that the probability of layering in use can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of hygiene products, and in particular to a wet-state anti-delamination absorbent composite material and its manufacturing process. Background Technology

[0002] Hygiene products, such as diapers and sanitary napkins, are used to absorb liquids and typically have an absorbent core. Existing absorbent cores often delaminate during use, affecting their usability. Summary of the Invention

[0003] To address the shortcomings of existing technologies, one of the objectives of this application is to provide a wet-state anti-delamination absorbent composite material and its manufacturing process, which has the advantage of reducing the probability of delamination during use.

[0004] The above-mentioned objective of this application is achieved through the following technical solution:

[0005] A wet-state anti-delamination absorbent composite material includes a top layer, an absorbent layer, and a bottom layer. The absorbent layer includes SAP particles, which are located between the top layer and the bottom layer. The SAP particles are adhered to at least the top layer or the bottom layer.

[0006] By adopting the above technical solution, the SAP particles are adhered to the top or bottom layer during use. Therefore, when the SAP particles absorb water, they will still be fixed on the top or bottom layer, thereby reducing the probability of delamination during use.

[0007] This application also discloses a production process for a wet-state anti-delamination absorbent composite material: the process for producing the aforementioned wet-state anti-delamination absorbent composite material includes the following production steps: a coating step, coating the top layer and the bottom layer with an adhesive; a bonding step, bonding SAP particles onto the top layer and the bottom layer; an air permeability testing step, performing an air permeability test on the top layer and the bottom layer after bonding the SAP particles; a adhesion testing step, testing the adhesion strength of the SAP particles; and a lamination step, laminating the standard-compliant top layer and the bottom layer to form a composite material.

[0008] By adopting the above technical solution, namely, by testing the firmness and breathability during production, the liquid penetration effect of the product can be achieved as expected, while the connection strength between the SAP particles and the top and bottom layers can also be achieved as expected.

[0009] In a preferred embodiment, this application can be further configured as follows: in the adhesion test step and the air permeability test step, a test roller is used. The test roller is hollow and has air vents. The top layer or bottom layer contacts the test roller and forms a wrap angle with the test roller, and covers the air vents on the test roller. After the air permeability test step, it is observed whether SAP particles on the top layer or bottom layer have fallen off. If the area of ​​falling off is larger than the standard value, it indicates that the adhesion effect of SAP does not meet the standard.

[0010] By adopting the above technical solution, when the surface layer or bottom layer passes through the test roller, due to the bending of the surface layer or bottom layer and the action of gas discharged through the air outlet, the SAP particles with weaker bonding strength will fall off under the action of airflow and the bending of the surface layer, thereby achieving the purpose of testing air permeability and firmness.

[0011] In a preferred embodiment, this application may be further configured such that: the detection roller is provided with multiple air guide pipes, the length direction of the air guide pipes is parallel to the axial direction of the detection roller, the multiple air guide pipes are evenly distributed in the detection roller and connected to the inner wall of the detection hole, and the air guide pipes are connected to the air outlet holes arranged axially on the detection roller.

[0012] By adopting the above technical solution, gas will only be discharged from the gas duct that is in contact with the surface layer or the bottom layer, thereby achieving the purpose of saving gas usage.

[0013] In a preferred embodiment, this application can be further configured such that: in the coating step, both the top layer and the bottom layer have an adhesive area and a void area, the adhesive area is coated with adhesive, and in the lamination step, a core layer is provided between the top layer and the bottom layer, the core layer having protrusions corresponding to the void areas.

[0014] By adopting the above technical solution, where the protrusions are located between the SAP particles bonded to the surface or bottom layer, when the SAP particles absorb water and expand, they will exert a squeezing and positioning effect on the protrusions, thereby reducing the probability of core layer displacement and the probability of overall delamination.

[0015] In a preferred embodiment, the present application may be further configured such that the protrusion comprises nonwoven fabric and SAP particles, the SAP particles being located within a strip formed of nonwoven fabric.

[0016] By adopting the above technical solution, the presence of SAP particles in the protrusion and the SAP particles adhered to the surface or bottom layer will both expand after absorbing water, thereby improving the positioning effect. Detailed Implementation

[0017] This application discloses a wet-state anti-delamination absorbent composite material, comprising a top layer, an absorbent layer, and a bottom layer. The absorbent layer is located between the top layer and the bottom layer, and includes SAP particles and a core layer. Both the top layer and the bottom layer are provided with an adhesive area and a void area. The adhesive area is coated with an adhesive liquid for bonding the SAP particles. The core layer includes a core body and protrusions. The protrusions are disposed on the surface of the core body and correspond to the void areas. The core body includes a capsule-like structure formed of nonwoven fabric, filled with wood pulp fibers and SAP particles. The protrusions include a strip-like structure formed of nonwoven fabric, filled with SAP particles and wood pulp fibers. The SAP particles are located in the direction close to the top layer or the bottom layer (i.e., when the protrusion is located on the side of the core body close to the top layer, the SAP particles in the protrusion are located in the direction close to the top layer (i.e., above the protrusion); similarly, when the protrusion is located on the side of the core body close to the bottom layer, the SAP particles in the protrusion are located in the direction close to the bottom layer (i.e., below the protrusion)). The SAP particles and wood pulp fibers are separated by toilet paper or nonwoven fabric.

[0018] This application also discloses a manufacturing process for a wet-state anti-delamination absorbent composite material, used to produce the aforementioned wet-state anti-delamination absorbent composite material, comprising the following manufacturing steps.

[0019] In the coating step, the surface layer is divided into an adhesive area and an unbonded area. Adhesive is then applied to the adhesive area between the surface layer and the bottom layer.

[0020] The bonding step involves bonding the SAP particles to the top and bottom layers.

[0021] The air permeability testing procedure involves testing the air permeability of the top and bottom layers after bonding the SAP particles. If the air permeability is poor, perforations are made in the areas with poor air permeability.

[0022] The adhesion test procedure assesses the adhesion strength of the SAP particles.

[0023] The composite process involves bonding a standard-compliant top layer, absorbent layer, and bottom layer together to form a composite material.

[0024] In the adhesion and permeability testing steps, a test roller is used. The test roller is hollow and has air vents. Multiple air guide tubes are installed inside the test roller, with their length parallel to the roller's axis. These air guide tubes are evenly distributed within the roller and connected to the inner wall of the test holes. The air guide tubes are connected to the axially arranged air vents on the test roller. The top or bottom layer contacts the test roller, forming a wrap around it and covering the air vents. After the permeability testing step, it is observed whether SAP particles have detached from the top or bottom layer. If the area of ​​detached particles is larger than the standard value, it indicates that the SAP adhesion effect does not meet the standard.

[0025] The implementation principle of this embodiment is as follows: In use, by bonding SAP particles to the surface layer and the bottom layer, the probability of SAP particle movement can be reduced. At the same time, after absorbing water, the SAP particles located on both sides of the protrusion will expand and clamp the protrusion. Since the SAP particles in the protrusion are close to the corresponding surface layer or bottom layer, after absorbing water, they cooperate with the SAP particles bonded to the surface layer or bottom layer to limit the core layer, thereby reducing the probability of displacement and delamination.

[0026] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A process for the production of a wet delamination resistant absorbent composite, for the production of a wet delamination resistant absorbent composite comprising a topsheet, an absorbent layer and a backsheet, said absorbent layer comprising SAP particles, the SAP particles being located between the topsheet and the backsheet, the SAP particles being at least adhered to the topsheet or the backsheet, characterized in that: The production process includes the following steps: a coating step, in which adhesive is applied to the top and bottom layers; a bonding step, in which SAP particles are bonded to the top and bottom layers; an air permeability testing step, in which the air permeability of the bonded SAP particles is tested; a adhesion testing step, in which the adhesion strength of the SAP particles is tested; and a lamination step, in which the standard-compliant top and bottom layers are laminated to form a composite material. In the coating step, both the top and bottom layers have bonding areas and empty areas. The bonding areas are coated with adhesive. In the lamination step, a core layer is provided between the top and bottom layers, and the core layer has protrusions corresponding to the empty areas. These protrusions are elongated structures formed of non-woven fabric, filled with SAP particles and wood pulp fibers, wherein the SAP particles are located closer to the top or bottom layer.

2. The production process of a wet-state anti-delamination absorbent composite material according to claim 1, characterized in that: In the adhesion test and air permeability test steps, a test roller is used. The test roller is hollow and has air vents. The top or bottom layer contacts the test roller and forms a wrap angle with the test roller, covering the air vents on the test roller. After the air permeability test step, it is observed whether SAP particles on the top or bottom layer have fallen off. If the area of ​​fallen off is larger than the standard value, it indicates that the adhesion effect of SAP does not meet the standard.

3. The production process of a wet-state anti-delamination absorbent composite material according to claim 2, characterized in that: The detection roller is also equipped with multiple air guide pipes. The length direction of the air guide pipes is parallel to the axial direction of the detection roller. The multiple air guide pipes are evenly distributed inside the detection roller and connected to the inner wall of the detection hole. The air guide pipes are connected to the air outlet holes arranged axially on the detection roller.