Layered flushable spunlace nonwoven fabric and method of making the same

Abstract

The application discloses layered flushable spunlace non-woven fabric and a preparation method thereof, which comprises a first surface layer, a second surface layer and an intermediate layer. The intermediate layer comprises a plurality of first non-woven web strips distributed at intervals, and a gap is left between two adjacent first non-woven web strips to form a first interval groove. The first surface layer comprises a plurality of second non-woven web strips, and each second non-woven web strip covers one side of the first interval groove. A gap is left between two adjacent second non-woven web strips to form a second interval groove. The second surface layer comprises a plurality of third non-woven web strips, and each third non-woven web strip covers the other side of the first interval groove. A gap is left between two adjacent third non-woven web strips to form a third interval groove. A first trigger adhesive is applied to the second interval groove, so that the friction and the sewage storage capacity in the cleaning process are improved, and the effect of being flushed away under the impact of water flow is good.

Description

Technical Field

[0001] This invention relates to the field of spunlace nonwoven fabric technology, and in particular to a layered washable spunlace nonwoven fabric and its preparation method. Background Technology

[0002] Ordinary non-woven fabric or non-woven fabric-based wet wipes have poor dispersibility under the impact of toilet water flow, which can easily clog toilets or pipes. Therefore, they cannot be thrown into the toilet after use, affecting the convenience of use.

[0003] To enhance the dispersibility of nonwoven fabrics, it is necessary to improve their resilience under water flow impact. However, this often reduces the structural strength that nonwoven fabrics can achieve during use. Weak nonwoven fabrics are prone to accidental damage during use, which affects the user experience.

[0004] In addition, to improve the structural strength of nonwoven fabrics during use, trigger adhesives can be used to reinforce the structure. These trigger adhesives are sprayed onto the surface of the nonwoven fabric to strengthen the bonding of fibers, thereby increasing tear resistance. For example, invention application number 2008800139515 discloses a layered dispersible substrate that uses a trigger adhesive to bond fibers. However, the trigger adhesive has a relatively large distribution area, and during use, the outer layer of the trigger adhesive easily comes into contact with salts in sewage and dissolves, leading to damage to the outer surface. When flushed in the toilet, the inner layer of the trigger adhesive is difficult to contact with salts in the water and thus cannot disperse quickly, requiring improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a layered, flushable spunlace nonwoven fabric and its preparation method, which improves cleaning ability and dispersion effect under the impact of toilet water flow.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A layered, washable spunlace nonwoven fabric includes: a first surface layer, a second surface layer, and an intermediate layer. The first and second surface layers are disposed on both sides of the intermediate layer. The intermediate layer includes a plurality of first nonwoven fiber strips spaced apart in the same plane, with gaps between adjacent first nonwoven fiber strips to form first gap grooves. The first surface layer includes a plurality of second nonwoven fiber strips spaced apart in the same plane, with each second nonwoven fiber strip covering one side of the first gap groove, and gaps between adjacent second nonwoven fiber strips to form second gap grooves. The second surface layer includes a plurality of third nonwoven fiber strips spaced apart in the same plane, with each third nonwoven fiber strip covering the other side of the first gap groove, and gaps between adjacent third nonwoven fiber strips to form third gap grooves. A first trigger adhesive connecting the second nonwoven fiber strips on both sides of the second gap groove and the corresponding first nonwoven fiber strip is applied to the second gap groove. A second trigger adhesive connecting the third nonwoven fiber strips on both sides of the third gap groove and the corresponding first nonwoven fiber strip is applied to the third gap groove.

[0008] The thickness of the first trigger adhesive is less than the depth of the second spacer groove.

[0009] The thickness of the second triggering adhesive is less than the depth of the third spacer groove.

[0010] The first triggering adhesive and the second triggering adhesive are respectively salt-triggered adhesives.

[0011] The first surface layer, the second surface layer, and the intermediate layer are composited using a hydroentanglement process.

[0012] The first, second, and third nonwoven fiber strips are all nonwoven fiber strips made of short fibers.

[0013] The short fibers include regenerated cellulose fibers several centimeters long.

[0014] To achieve this objective, the present invention employs the following other technical solution:

[0015] A method for preparing a nonwoven fabric includes the following steps:

[0016] Web laying: Using three web laying machines, short fibers are laid simultaneously to obtain three nonwoven fiber webs, which are then cut along the width direction to obtain the corresponding first nonwoven fiber web strip, second nonwoven fiber web strip and third nonwoven fiber web strip;

[0017] Compaction: The first nonwoven fiber strips are arranged at intervals according to the width of the first interval groove to form an intermediate layer. The second nonwoven fiber strips are arranged at intervals according to the width of the second interval groove to form a first surface layer. The third nonwoven fiber strips are arranged at intervals according to the width of the third interval groove to form a second surface layer. The intermediate layer is placed between the first surface layer and the second surface layer and fed into the roller pressing equipment together. The upper and lower rollers are used to compact the mixture to form a nonwoven semi-finished product.

[0018] Hydroentangling: The non-woven fabric semi-finished product is fed into a hydroentangling machine for hydroentangling processing, and after drying, non-woven fabric blank is obtained;

[0019] Adhesive application: Apply the first trigger adhesive to the second spacer groove and the second trigger adhesive to the third spacer groove. After drying, the nonwoven fabric product is obtained and then wound up.

[0020] The first and second interval slots are staggered, and the second and third interval slots are staggered.

[0021] Wherein, the width of the first nonwoven fiber strip is greater than the width of the second and third spacer grooves, and the widths of the second and third nonwoven fiber strips are respectively greater than the width of the first spacer groove.

[0022] The beneficial effects of this invention are as follows: A layered, flushable spunlace nonwoven fabric and its preparation method are provided. In particular, a second and a third spacer groove are designed on the first and second surface layers, which improves the friction and dirt storage capacity during the cleaning process. The first and second triggering adhesives in the second and third spacer grooves gradually dissolve when they encounter salt substances (such as calcium and magnesium ions in water) during use and under the impact of toilet water flow, reducing the connection strength of the first, second, and third nonwoven fiber strips. This weakens the structure of the first, second, and intermediate surface layers, making them easier to be flushed away under the impact of water flow, thus reducing the problem of blockage in toilets and pipes. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 yes Figure 1 The left view. Detailed Implementation

[0025] The following is combined with Figures 1-2 The technical solution of the present invention will be further illustrated through specific embodiments.

[0026] like Figure 1 and Figure 2The layered, washable spunlace nonwoven fabric shown includes: a first surface layer 1, a second surface layer 2, and an intermediate layer 3. The first surface layer 1 and the second surface layer 2 are disposed on both sides of the intermediate layer 3 to form a layered distribution structure.

[0027] The intermediate layer 3 includes a plurality of first nonwoven fiber strips 31 spaced apart on the same plane. A gap is left between two adjacent first nonwoven fiber strips 31 to form a first gap groove 8, and the intermediate layer 3 structure is weakened by the first gap groove 8.

[0028] The first surface layer 1 includes a plurality of second nonwoven fiber strips 11 spaced apart on the same plane. The second nonwoven fiber strips 11 respectively cover one side of the first spacer groove 8 to prevent the first spacer groove 8 from being exposed. A gap is left between two adjacent second nonwoven fiber strips 11 to form a second spacer groove 4, thereby weakening the first surface layer 1.

[0029] In this embodiment, the second surface layer 2 includes a plurality of third nonwoven fiber strips 21 spaced apart on the same plane. The third nonwoven fiber strips 21 respectively cover the other side of the first spacer groove 8, thereby sealing the other side of the first spacer groove 8. A gap is left between two adjacent third nonwoven fiber strips 21 to form a third spacer groove 6, thereby weakening the second surface layer 2 and making it easier to be flushed away in toilet water.

[0030] like Figure 2 As shown, the second spacer groove 4 is coated with a first triggering adhesive 5 that connects the second nonwoven fiber strips 11 and the corresponding first nonwoven fiber strips 31 on both sides of the second spacer groove 4. In this embodiment, the thickness of the first triggering adhesive 5 is less than the depth of the second spacer groove 4, which can reduce the amount of the first triggering adhesive 5 used, and ensure the connection strength between the second nonwoven fiber strips 11 and the first nonwoven fiber strips 31, making it more stable during use.

[0031] like Figure 1 As shown, a second triggering adhesive 7 is applied to the third spacer groove 6 to connect the third nonwoven fiber strips 21 and the corresponding first nonwoven fiber strips 31 on both sides of the third spacer groove 6. In this embodiment, the thickness of the second triggering adhesive 7 is less than the depth of the third spacer groove 6, which reduces the amount of second triggering adhesive 7 used while ensuring the connection strength between the third nonwoven fiber strips 21 and the first nonwoven fiber strips 31, reducing damage during use. In addition, the second spacer groove 4 and the third spacer groove improve the friction and dirt storage capacity during the cleaning process, thereby improving the cleaning effect of the nonwoven fabric.

[0032] In this embodiment, the first triggering adhesive 5 and the second triggering adhesive 7 are salt-triggered adhesives, insoluble in pure water and salt-free solutions. Therefore, pure water and salt-free solutions can be added to the nonwoven fabric to form a wet wipe. The toilet water contains salt components such as calcium and magnesium ions, which can dissolve the first triggering adhesive 5 and the second triggering adhesive 7, reducing the connection strength of the first nonwoven fiber strip 31, the second nonwoven fiber strip 11, and the third nonwoven fiber strip 21. This further weakens the structure of the first surface layer 1, the second surface layer 2, and the intermediate layer 3, making them easier to be flushed away under the impact of water flow, thus reducing the problem of blockage in the toilet and pipes.

[0033] The structure of the first surface layer 1, the second surface layer 2, and the intermediate layer 3 is too weak, which is not conducive to the stability during use. Therefore, the first surface layer 1, the second surface layer 2, and the intermediate layer 3 are composited by hydroentangling to improve the structural strength, so that the fibers in the weak first surface layer 1, the second surface layer 2, and the intermediate layer 3 are intertwined, thus reinforcing the stacked first surface layer 1, the second surface layer 2, and the intermediate layer 3.

[0034] In this embodiment, the first nonwoven fiber strip 31, the second nonwoven fiber strip 11, and the third nonwoven fiber strip 21 are all made of short fibers. Short fibers are relatively inexpensive and, compared to nonwoven fiber strips made of long fibers, are easier to break, which is beneficial for dispersion under water flow impact. The short fibers include regenerated cellulose fibers several centimeters long, and the resulting nonwoven fabric has good moisture absorption and breathability.

[0035] A method for preparing a nonwoven fabric includes the following steps:

[0036] Web laying: Using three web laying machines, short fibers are laid simultaneously to obtain three nonwoven fiber webs, which are then cut along the width direction to obtain the corresponding first nonwoven fiber web strip 31, second nonwoven fiber web strip 11 and third nonwoven fiber web strip 21. In this embodiment, the first nonwoven fiber web strip 31, second nonwoven fiber web strip 11 and third nonwoven fiber web strip 21 have the same width, which facilitates production.

[0037] Compaction: The first nonwoven fiber strip 31 is arranged at intervals according to the width of the first interval groove 8 to form the intermediate layer 3. The second nonwoven fiber strip 11 is arranged at intervals according to the width of the second interval groove 4 to form the first surface layer 1. The third nonwoven fiber strip 21 is arranged at intervals according to the width of the third interval groove 6 to form the second surface layer 2. The intermediate layer 3 is placed between the first surface layer 1 and the second surface layer 2 and fed into the roller pressing equipment together. The upper and lower rollers are used to compact the mixture to form a nonwoven fabric semi-finished product.

[0038] like Figure 2As shown, the first spacer groove 8 and the second spacer groove 4 are staggered, the second spacer groove 4 and the third spacer groove 6 are staggered, the width of the first nonwoven fiber strip 31 is greater than the width of the second spacer groove 4 and the third spacer groove 6, to avoid the second spacer groove 4 and the third spacer groove 6 from connecting and to ensure stability during use, the width of the second nonwoven fiber strip 11 and the third nonwoven fiber strip 21 is greater than the width of the first spacer groove 8, to ensure that both sides of the first spacer groove 8 are blocked;

[0039] Hydroentangling: The non-woven fabric semi-finished product is fed into the hydroentangling machine for hydroentangling processing. After drying, the non-woven fabric blank is obtained. The hydroentangling process strengthens the stacked first surface layer 1, second surface layer 2 and intermediate layer 3, avoiding the problem of being too thin.

[0040] Adhesive application: Apply the first trigger adhesive 5 to the second spacer groove 4 and the second trigger adhesive 7 to the third spacer groove 6. After drying, the nonwoven fabric product is obtained and then wound up.

[0041] When nonwoven fabric is first used, its structure is relatively strong and it will not be easily damaged. As it is used, the first triggering adhesive 5 and the second triggering adhesive 7 gradually dissolve when they come into contact with salt substances (such as calcium and magnesium ions in water), gradually reducing the connection strength of the first nonwoven fiber strip 31, the second nonwoven fiber strip 11 and the third nonwoven fiber strip 21. This weakens the structure of the first surface layer 1, the second surface layer 2 and the intermediate layer 3, making it easier to be flushed away by the water flow after being thrown into the toilet, thus reducing the problem of blockage in the toilet and pipes.

[0042] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A layered, washable spunlace nonwoven fabric, characterized in that, include: The system comprises a first surface layer, a second surface layer, and an intermediate layer. The first and second surface layers are disposed on both sides of the intermediate layer. The intermediate layer includes a plurality of first nonwoven fiber strips spaced apart in the same plane, with gaps between adjacent first nonwoven fiber strips to form first gap grooves. The first surface layer includes a plurality of second nonwoven fiber strips spaced apart in the same plane, each second nonwoven fiber strip covering one side of the first gap groove, with gaps between adjacent second nonwoven fiber strips to form second gap grooves. The second surface layer includes a plurality of third nonwoven fiber strips spaced apart in the same plane, each third nonwoven fiber strip covering the other side of the first gap groove, with gaps between adjacent third nonwoven fiber strips to form third gap grooves. A first trigger adhesive connecting the second nonwoven fiber strips and corresponding first nonwoven fiber strips on both sides of the second gap groove is applied to the second gap groove. A second trigger adhesive connecting the third nonwoven fiber strips and corresponding first nonwoven fiber strips on both sides of the third gap groove is applied to the third gap groove.

2. The layered, washable spunlace nonwoven fabric according to claim 1, characterized in that, The thickness of the first trigger adhesive is less than the depth of the second spacer groove.

3. The layered, washable spunlace nonwoven fabric according to claim 1, characterized in that, The thickness of the second trigger adhesive is less than the depth of the third spacer groove.

4. The layered, washable spunlace nonwoven fabric according to claim 1, characterized in that, The first triggering adhesive and the second triggering adhesive are respectively salt-triggered adhesives.

5. The layered, washable spunlace nonwoven fabric according to claim 1, characterized in that, The first surface layer, the second surface layer, and the intermediate layer are composited using a hydroentanglement process.

6. The layered, washable spunlace nonwoven fabric according to claim 1, characterized in that, The first, second, and third nonwoven fiber strips are all nonwoven fiber strips made of short fibers.

7. The layered, washable spunlace nonwoven fabric according to claim 6, characterized in that, The short fibers include regenerated cellulose fibers several centimeters long.

8. A method for preparing a nonwoven fabric, comprising producing the layered, washable, spunlace nonwoven fabric as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Web laying: Using three web laying machines, short fibers are laid simultaneously to obtain three nonwoven fiber webs, which are then cut along the width direction to obtain the corresponding first nonwoven fiber web strip, second nonwoven fiber web strip and third nonwoven fiber web strip; Compaction: The first nonwoven fiber strips are arranged at intervals according to the width of the first interval groove to form an intermediate layer. The second nonwoven fiber strips are arranged at intervals according to the width of the second interval groove to form a first surface layer. The third nonwoven fiber strips are arranged at intervals according to the width of the third interval groove to form a second surface layer. The intermediate layer is placed between the first surface layer and the second surface layer and fed into the roller pressing equipment together. The upper and lower rollers are used to compact the mixture to form a nonwoven semi-finished product. Hydroentangling: The non-woven fabric semi-finished product is fed into a hydroentangling machine for hydroentangling processing, and after drying, non-woven fabric blank is obtained; Adhesive application: Apply the first trigger adhesive to the second spacer groove and the second trigger adhesive to the third spacer groove. After drying, the nonwoven fabric product is obtained and then wound up.

9. The method for preparing nonwoven fabric according to claim 8, characterized in that, The first and second interval slots are staggered, and the second and third interval slots are staggered.

10. The method for preparing nonwoven fabric according to claim 8, characterized in that, The width of the first nonwoven fiber strip is greater than the width of the second and third spacer grooves, and the widths of the second and third nonwoven fiber strips are respectively greater than the width of the first spacer groove.

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