Single-layer absorption core body and preparation method and application of single-layer absorption core body

Abstract

The invention relates to a single-layer absorption core. The single-layer absorption core is characterized in that a flow guide material is one or two of degreasing cotton fibers and wood pulp fibers; the absorbing material adopts water-absorbent resin; the binding material is one or two of hot melting fiber or hydrosol; the diversion material and the hot melting fiber form a core fiber web framework after being carded by airflow, and the core fiber web framework is filled with the water-absorbent resin and the hydrosol. A fiber skeleton is formed by carding air laying, and different components in the core body can be fully mixed and staggered to form a single-layer absorption core body in a multi-layer water-absorbent resin spraying mode, so that the uniformity of the absorption core body is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sanitary products, in particular to a single-layer absorbent core and a preparation method and application of the single-layer absorbent core. Background Art

[0002] Disposable sanitary absorbent core has good liquid absorption and liquid lock performance, and is suitable for sanitary napkins, diapers, diaper pads and other products. The absorbent core that is widely used in the market is made of wood pulp fiber, super absorbent resin and other materials through non-woven process to form three layers with different functions: guide layer, water absorption layer and water lock layer, and then composited by spraying glue.

[0003] The current processing technology used for the core is to prepare three different functional layers separately and then compound them, resulting in poor product fluffiness, softness, and liquid absorption rate, affecting the user experience. In addition, the three-layer composite process is complicated and the product cost is high. Summary of the invention

[0004] The object of the present invention is to provide a single-layer absorbent core to solve the problems raised in the above background technology.

[0005] A single-layer absorbent core comprises: a flow-guiding material, an absorbent material and a bonding material.

[0006] The diversion material is one or both of absorbent cotton fiber and wood pulp fiber;

[0007] The absorbent material is a water-absorbing resin;

[0008] The bonding material is one or both of hot-melt fiber and hydrosol;

[0009] The flow-guiding material is combed by airflow to form a core fiber web skeleton, and the water-absorbing resin is fixedly filled in the gaps of the core fiber web skeleton by using the bonding material.

[0010] In a possible implementation manner, the mass ratio of the flow-guiding material, the absorption material and the bonding material is 2-5:2-6:1-2; the mass ratio of the hot-melt fiber to the hydrosol is 1-9:9-1.

[0011] In a possible embodiment, the hydrosol is one or more of polyacrylate, ethylene-vinyl acetate copolymer, polyvinyl alcohol, carboxymethyl cellulose, and starch;

[0012] The hot-melt fiber is one or more of polyester, acrylic, nylon, vinylon, spandex, polypropylene, polylactic acid fiber, and ES fiber.

[0013] In a possible implementation, the absorbent cotton fiber or wood pulp fiber has a linear density of 0.8 dtex to 4.0 dtex and a length of 1 mm to 10.0 mm;

[0014] The mesh number of the water-absorbing resin is 50-300 meshes.

[0015] As a second aspect of the present application, the present application also provides a method for preparing a single-layer absorbent core, comprising:

[0016] S1, combing the flow-guiding material by airflow to form a fiber web skeleton;

[0017] S2, spraying the water-absorbing resin evenly between the fiber web skeletons to obtain mixed fibers;

[0018] S3, spraying the hydrosol onto the upper and lower surfaces of the mixed fibers to obtain a core to be treated;

[0019] S4, placing the core to be processed into an oven for hot air bonding and embossing;

[0020] S5, taking out from the oven, cooling and rolling up, to obtain the aforementioned single-layer absorbent core.

[0021] The preparation method of the single-layer absorbent core can also adopt the following steps:

[0022] S1, mixing the flow-guiding material and the hot-melt fiber, breaking them up, and then air-combing them to form a fiber web skeleton;

[0023] S2, spraying the water-absorbing resin evenly between the fiber web skeletons to obtain mixed fibers;

[0024] S3, placing the mixed fiber body into an oven for hot air bonding and embossing;

[0025] S4, taking out from the oven, cooling and rolling up, to obtain the aforementioned single-layer absorbent core.

[0026] Wherein, before step S3, the method further includes:

[0027] The hydrosol is sprayed onto the upper and lower surfaces of the mixed fibers.

[0028] In a possible implementation, the output speed of the fiber mesh skeleton is 20 m / min-100 m / min.

[0029] In a possible implementation manner, the spraying amount of the water-absorbing resin is 1000 g / min to 3000 g / min.

[0030] In a possible implementation manner, the spraying amount of the hydrosol is 100 g / min to 400 g / min.

[0031] In a possible embodiment, the single-layer absorbent core has a gram weight of 50 g / m 2 ~300g / m 2 .

[0032] As the third aspect of the present application, the present application also proposes the use of a single-layer absorbent core in sanitary products, including infant diapers, pull-on pants, sanitary napkins, menstrual pants, adult diapers, incontinence pants and urine pads.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The airflow forms a fiber skeleton, and the multi-layer spraying of water-absorbent resin can make the different components in the core fully mixed and interlaced to form a single-layer absorbent core with multiple functions.

[0035] 2. Using hot-melt fiber bonding can reduce the amount of glue used or eliminate the use of glue, thereby increasing the product's absorption rate, fluffiness and softness.

[0036] 3. The core is single-layer and can be formed in one go, reducing processes, lowering production costs and improving product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of the single-layer absorbent core of the present application;

[0038] Figure 2 This is a flow chart of the method for preparing the single-layer absorbent core of the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that the serial numbers assigned to the components in the embodiments of the present invention, such as "first" and "second", are only used to distinguish the objects being described and do not have any order or technical meaning.

[0041] Combine the following Figure 1 The single layer absorbent core of the present invention is described.

[0042] A single-layer absorbent core comprises a flow-guiding material, an absorbent material and a bonding material, wherein.

[0043] The diversion material is one or both of absorbent cotton fiber and wood pulp fiber;

[0044] The absorbent material is a water-absorbing resin;

[0045] The bonding material is one or both of hot-melt fiber and hydrosol;

[0046] The flow-guiding material is combed by airflow to form a core fiber mesh skeleton, and the water-absorbing resin is fixedly filled in the gaps of the core fiber mesh skeleton by the bonding material. The hydrosol is one or more of polyacrylate, ethylene-vinyl acetate copolymer, polyvinyl alcohol, carboxymethyl cellulose, and starch; the hot-melt fiber is one or more of polyester, acrylic, nylon, vinylon, spandex, polypropylene, polylactic acid fiber, and ES fiber. The linear density of the absorbent cotton fiber or wood pulp fiber is 0.8 dtex to 4.0 dtex and the length is 1 mm to 10.0 mm; the mesh number of the water-absorbing resin is 50 to 300 meshes.

[0047] In the present application, the absorbent cotton fiber and wood pulp fiber are combed to form a core fiber skeleton by air flow method, and then the water-absorbing resin is sprayed on the surface of the core fiber skeleton, and then a hydrosol is added to fix it, and finally the required single-layer absorption core is obtained by drying through the joint action of the hot-melt fiber and the hydrosol. When preparing the core fiber skeleton, the hot-melt fiber can also be mixed with the absorbent cotton fiber or the wood pulp fiber, and then combed to obtain it. When the core fiber skeleton contains hot-melt fiber, the water-absorbing resin can be fixed without using a hydrosol, and the viscosity of the hot-melt fiber can be directly used to fix the water-absorbing resin. That is, in the present invention, the hot-melt fiber and the hydrosol can be used together or separately.

[0048] Different from the previous method of preparing the guide layer, water absorption layer and water lock layer separately, and then spraying glue to fix the three layers to prepare the absorbent core. The absorbent core prepared in this application can achieve the functions of guide, water absorption and water lock with only one layer. The core fiber skeleton can play a supporting role, so that it will not be deformed during the preparation process, and the water-absorbing resin has relatively good elasticity and viscosity, can be well attached to the core fiber skeleton, and can fill the core fiber skeleton. Finally, a small amount of hydrosol is added for adhesive supplementation and sealing, so that the prepared single-layer absorbent core has excellent performance indicators such as absorption rate, fluffiness, and softness.

[0049] Combine the following Figure 2 A preparation method of a single-layer absorbent core of the present application is described. In the following embodiments, the flow-guiding material is a mixture of absorbent cotton fiber and wood pulp fiber, the mass ratio of the two is 1:1, the hot-melt fiber is ES fiber, the water-absorbing resin is SAP, and the hydrosol is polyacrylate.

[0050] Embodiment 1, a method for preparing a single-layer absorbent core, comprising the following steps:

[0051] S1. Mix the flow-guiding material and ES fiber in a mass ratio of 10:1, break them up, and form a fiber web skeleton by air combing. The output speed of the fiber web skeleton is 20 m / min.

[0052] S2, spraying SAP uniformly between the fiber web skeletons at a speed of 1000 g / min, and obtaining mixed fibers when the mass ratio of the flow-guiding material to the SAP is 5:2;

[0053] S3, spraying the polyacrylate onto the upper and lower surfaces of the mixed fiber at a spraying amount of 100 g / min and a mass ratio of 1:10 to the diversion material to obtain a core to be treated;

[0054] S4, placing the core to be processed into an oven for hot air bonding at 120-250° C., and then embossing;

[0055] S5. Take the core out of the oven, cool it, and roll it up.

[0056] Embodiment 2, a method for preparing a single-layer absorbent core, comprising the following steps:

[0057] S1, the flow-guiding material and ES fiber are mixed in a mass ratio of 10:1, broken up, and combed by air flow to form a fiber web skeleton, and the output speed of the fiber web skeleton is 100m / min;

[0058] S2, spraying SAP uniformly between the fiber web skeletons at a speed of 3000 g / min, and obtaining mixed fibers when the mass ratio of the flow-guiding material to the SAP is 5:6;

[0059] S3, spraying the polyacrylate onto the upper and lower surfaces of the mixed fiber at a spraying rate of 400 g / min and a mass ratio of 1:10 to the diversion material to obtain a core to be treated;

[0060] S4, placing the core to be processed into an oven for hot air bonding at 120-250° C., and then embossing;

[0061] S5. Take the core out of the oven, cool it, and roll it up.

[0062] Embodiment 3, a method for preparing a single-layer absorbent core, comprising the following steps:

[0063] S1, the flow-guiding material and ES fiber are mixed in a mass ratio of 50:9, broken up, and combed by air flow to form a fiber web skeleton, and the output speed of the fiber web skeleton is 60m / min;

[0064] S2, spraying SAP uniformly between the fiber web skeletons at a speed of 2000 g / min, and obtaining mixed fibers when the mass ratio of the flow-guiding material to the SAP is 5:4;

[0065] S3, spraying the polyacrylate onto the upper and lower surfaces of the mixed fiber at a spraying rate of 250 g / min and a mass ratio of 1:50 to the diversion material to obtain a core to be treated;

[0066] S4, placing the core to be processed into an oven for hot air bonding at 120-250° C., and then embossing;

[0067] S5. Take the core out of the oven, cool it, and roll it up.

[0068] Example 4: This example differs from Example 3 in that ES fiber is not used. Step S1 of this example is as follows:

[0069] The guide material is combed by air flow to form a fiber mesh skeleton, and the output speed of the fiber mesh skeleton is 60m / min.

[0070] The subsequent steps are completely consistent with Example 3.

[0071] Example 5: This example differs from Example 3 in that polyacrylate is not added, and after the treatment in step S2, the hot air treatment in step S4 is directly performed.

[0072] Embodiment 6, a method for preparing a single-layer absorbent core, comprising the following steps:

[0073] S1. Mix the flow-guiding material and ES fiber in a mass ratio of 5:1, break them up, and form a fiber web skeleton by air combing. The output speed of the fiber web skeleton is 60 m / min.

[0074] S2, spraying SAP uniformly between the fiber web skeletons at a speed of 2000 g / min, and obtaining mixed fibers when the mass ratio of the flow-guiding material to the SAP is 1:1;

[0075] S3, spraying the polyacrylate onto the upper and lower surfaces of the mixed fiber at a spraying rate of 250 g / min and a mass ratio of 1:5 to the diversion material to obtain a core to be treated;

[0076] S4, placing the core to be processed into an oven for hot air bonding at 120-250° C., and then embossing;

[0077] S5. Take the core out of the oven, cool it, and roll it up.

[0078] Embodiment 7, a method for preparing a single-layer absorbent core, comprising the following steps:

[0079] S1. Mix the flow-guiding material and ES fiber in a mass ratio of 4:1, break them up, and form a fiber web skeleton by air combing. The output speed of the fiber web skeleton is 50 m / min.

[0080] S2, spraying SAP uniformly between the fiber web skeletons at a speed of 2000 g / min, and obtaining mixed fibers when the mass ratio of the flow-guiding material to the SAP is 2:1;

[0081] S3, spraying the polyacrylate onto the upper and lower surfaces of the mixed fiber at a spraying rate of 220 g / min and in a mass ratio of 1:4 to the diversion material to obtain a core body to be treated;

[0082] S4, placing the core to be processed into an oven for hot air bonding at 120-250° C., and then embossing;

[0083] S5. Take the core out of the oven, cool it, and roll it up.

[0084] Comparative Example: A method for preparing a single-layer absorbent core comprises the following steps:

[0085] S1. Mix the diversion material and ES fiber in a mass ratio of 10:1, break them up, and form premixed fibers;

[0086] S2, spraying SAP evenly between the premixed fibers at a speed of 2000 g / min, and obtaining mixed fibers when the mass ratio of the flow-guiding material to the SAP is 2:1;

[0087] S3, spraying the polyacrylate onto the upper and lower surfaces of the mixed fiber at a spraying rate of 220 g / min and a mass ratio of 1:10 to the diversion material to obtain a core body to be treated;

[0088] S4, placing the core to be processed into an oven for hot air bonding at 120-250° C., and then embossing;

[0089] S5. Take the core out of the oven, cool it, and roll it up.

[0090] Different from Examples 1-7, in this comparative example, airflow is not used to comb the fibers after they are scattered, but water-absorbing resin and hydrosol are directly added for bonding. Since the fiber skeleton cannot be formed without airflow combing, the water-absorbing resin will agglomerate between the premixed fibers and cannot be effectively dispersed.

[0091] The performance tests of the various embodiments and comparative examples of the present application are carried out below. The test standards for absorption rate and absorption speed are QB / T 5650-2021, the test standard for fluffiness (the test index is air permeability) is GB / T 5453-1997, and the test standard for softness (the test index is bending performance) is GB / T18318.1-2009. The test results are detailed in Table 1.

[0092]

[0093] Note: The absorbance test solution is 0.9% saline.

[0094] It can be seen from the above test results that the single-layer absorbent core prepared by the preparation method of the present application is significantly higher than the control example in various performance indicators. This is because in the embodiment, air flow combing is used to obtain a fiber mesh skeleton, and then the water-absorbent resin and hydrosol are used to fill the gaps and bond them, so that the prepared single-layer absorbent core has excellent bending performance while ensuring water absorption, especially Example 2.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A single-layer absorbent core, comprising: The flow-guiding material, the absorbing material and the bonding material are characterized in that the flow-guiding material is made of one or both of absorbent cotton fiber and wood pulp fiber; The absorbent material is a water-absorbing resin; The bonding material is one or both of hot-melt fiber and hydrosol; The flow-guiding material is combed by airflow to form a core fiber web skeleton, and the water-absorbing resin is fixedly filled in the gaps of the core fiber web skeleton by using the bonding material.

2. The single-layer absorbent core according to claim 1, characterized in that: The mass ratio of the diversion material, the absorption material and the bonding material is 2-5:2-6:1-2; The mass ratio of the hot-melt fiber to the hydrosol is 1-9:9-1.

3. The single-layer absorbent core according to claim 1, characterized in that: The hydrosol is one or more of polyacrylate, ethylene-vinyl acetate copolymer, polyvinyl alcohol, carboxymethyl cellulose, and starch; The hot-melt fiber is one or more of polyester, acrylic, nylon, vinylon, spandex, polypropylene, polylactic acid fiber, and ES fiber.

4. The single-layer absorbent core according to claim 1, characterized in that: The absorbent cotton fiber or wood pulp fiber has a linear density of 0.8 dtex to 4.0 dtex and a length of 1 mm to 10.0 mm; The mesh number of the water-absorbing resin is 50-300 meshes.

5. A method for preparing a single-layer absorbent core, characterized in that: include: S1, combing the flow-guiding material by airflow to form a fiber web skeleton; S2, spraying the water-absorbing resin evenly between the fiber web skeletons to obtain mixed fibers; S3, spraying the hydrosol onto the upper and lower surfaces of the mixed fibers to obtain a core to be treated; S4, placing the core to be processed into an oven for hot air bonding and embossing; S5. Take out from the oven, cool and roll up to obtain the single-layer absorbent core as described in any one of claims 1 to 4.

6. A method for preparing a single-layer absorbent core, characterized in that: include: S1, mixing the flow-guiding material and the hot-melt fiber, breaking them up and then combing them with air flow to form a fiber web skeleton; S2, spraying the water-absorbing resin evenly between the fiber web skeletons to obtain mixed fibers; S3, placing the mixed fiber body into an oven for hot air bonding and embossing; S4. Take out from the oven, cool and roll up to obtain the single-layer absorbent core as described in any one of claims 1 to 4.

7. The method for preparing a single-layer absorbent core according to claim 6, characterized in that: Before step S3, the following steps are also included: The hydrosol is sprayed onto the upper and lower surfaces of the mixed fibers.

8. The method for preparing a single-layer absorbent core according to claim 5 or 6, characterized in that: The output speed of the fiber mesh skeleton is 20m / min-100m / min; the spraying amount of the water-absorbing resin is 1000g / min-3000g / min; the gram weight of the single-layer absorption core is 50g / m 2 ~300g / m 2 .

9. The method for preparing a single-layer absorbent core according to claim 5 or 7, characterized in that: The spraying amount of the hydrosol is 100 g / min to 400 g / min.

10. Use of a single-layer absorbent core in sanitary products, wherein the single-layer absorbent core is the single-layer absorbent core according to any one of claims 1 to 4, and the sanitary products include baby diapers, pull-on pants, sanitary napkins, menstrual pants, adult diapers, incontinence pants and urine-isolating pads.

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