CN109537168B

CN109537168B - Nonwoven fabric and wet wipe

Info

Publication number: CN109537168B
Application number: CN201710870150.1A
Authority: CN
Inventors: 于洁; 周建英; 张涛
Original assignee: Gold HongYe Paper Group Co Ltd
Current assignee: Gold HongYe Paper Group Co Ltd
Priority date: 2017-09-22
Filing date: 2017-09-22
Publication date: 2022-09-13
Anticipated expiration: 2037-09-22
Also published as: CN109537168A

Abstract

The application discloses non-woven fabrics and wet piece of cloth, this non-woven fabrics includes: the surface of the base body is provided with a plurality of micro-protrusions, and the micro-protrusions are provided with texturing structures. Through the mode, the non-woven fabric has good dispersibility, so that the waste non-woven fabric is easy to disperse under the action of water flow, and convenience is brought to subsequent garbage treatment.

Description

Nonwoven fabric and wet wipe

Technical Field

The application relates to the technical field of non-woven fabrics, in particular to a dispersible non-woven fabric and a wet tissue using the non-woven fabric.

Background

With the rapid development of economic level, people pursue increasingly higher quality of life, and the non-woven fabric material is developing to the aspect of green environmental protection. In recent years, with the popularization and development of global green and environment-friendly products, the non-woven fabric material also faces a new revolution of innovation, and the degradable and dispersible non-woven fabric material is produced at the same time.

It has been found that an important factor in the clogging of sewer pipes is caused by non-flushable wiping materials, which are usually nonwoven fabrics as the substrate. The post-treatment of these disposable wiping materials is receiving a great deal of attention, and the conventional disposal methods such as landfill and incineration increase environmental pollution, and it is a direction of industrial research to solve the disposal problem of the disposable wiping materials through a drainage system.

However, the inventor of the present application found in the long-term research and development process that the disposable wiping material in practical application can not really achieve the effect of flushability, and in some cases, the dispersion time is long, and the wet strength is low, especially in the wet tissue field, because these nonwoven fabric base materials need to be soaked in liquid for a long time, the phenomenon that the wet strength is low or the nonwoven fabric base materials are not easy to disperse is more likely to occur.

Disclosure of Invention

The main technical problem who solves of this application provides a non-woven fabrics and wet piece of cloth, and this non-woven fabrics and wet piece of cloth have good dispersibility, bring the convenience for subsequent refuse treatment.

In order to solve the technical problem, the application adopts a technical scheme that: providing a nonwoven fabric, the nonwoven fabric comprising: the surface of the base body is provided with a plurality of micro-protrusions, and the micro-protrusions are provided with texturing structures.

The base body comprises natural fibers and regenerated fibers, and the mass ratio of the natural fibers to the regenerated fibers is 9:1-3: 7.

The natural fibers are wood pulp fibers, and the length of the wood pulp fibers is 1.5-6.5 mm; the regenerated fibers include first regenerated fibers and second regenerated fibers, and the first regenerated fibers and the second regenerated fibers are different in length or different in shape.

Wherein the wood pulp fiber is softwood wood pulp fiber.

Wherein the length of the first regenerated fiber is 3-12mm, and the length of the second regenerated fiber is 6-20 mm.

The first regenerated fibers are flat viscose fibers, and the second regenerated fibers are round viscose fibers; the length of the flat viscose fiber is 5mm-30mm, and the length of the round viscose fiber is 4mm-30 mm.

Wherein the diameter of the microprotrusions is 0.05-2.0 mm.

Wherein the height of the micro-bumps is less than 70% of the height of the substrate; the height of the micro-bumps is 0.05-2 mm; the distribution density of the micro-protrusions on the surface of the substrate is 5-40 per 25 square millimeters; the micro-bulges are arranged on the surface of the substrate in an array manner or the micro-bulges are arranged on the surface of the substrate randomly.

Wherein the frosted structure comprises a pile comprising an extended matrix portion having a length greater than or equal to 1 mm; the fluff is wood pulp fiber; the hydrolysis time of the nonwoven fabric is 600 seconds or less.

In order to solve the technical problem, the other technical scheme adopted by the application is as follows: there is provided a wet wipe comprising the nonwoven fabric as defined in any one of the above.

The beneficial effect of this application is: in contrast to the state of the art, the nonwoven fabric of the present application comprises: the surface of the base body is provided with a plurality of micro-protrusions, and the micro-protrusions are provided with texturing structures. Through the mode, the non-woven fabric has good dispersibility, so that the waste non-woven fabric and the wet tissue comprising the non-woven fabric are easy to disperse under the action of water flow, and convenience is brought to subsequent garbage treatment.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

fig. 1 is a schematic structural view of an embodiment of the nonwoven fabric of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a nonwoven fabric of the present application.

The non-woven fabric comprises a substrate 10, wherein a plurality of micro-protrusions 20 are arranged on the surface of the substrate 10, and the micro-protrusions 20 are provided with a textured structure 30.

The matrix 10 generally comprises natural fibers and regenerated fibers that are intertwined with one another to form a sheet-like material.

Wherein the natural fiber can be at least one of wood pulp fiber, bamboo fiber, straw pulp fiber, sugar cane pulp fiber and cotton pulp fiber. Preferably, the length of the natural fiber is 10mm or less in one embodiment, and a fiber having good dispersibility in water, that is, a water-dispersible fiber is preferably used. The dispersibility into water herein means a property capable of separating fibers from each other when contacting a large amount of water. The fiber length means an average fiber length.

Among natural fibers, wood pulp fibers have better water dispersibility. On the one hand, when the nonwoven fabric containing wood pulp fibers is brought into contact with a large amount of water, the wood pulp fibers are easily detached from the nonwoven fabric due to swelling of the wood pulp fibers, so that the matrix 10 becomes easily hydrolyzed, thereby improving dispersibility of the nonwoven fabric. On the other hand, in the matrix, the wood pulp fibers also provide strength and a matrix base to the matrix, and if the fiber length is too short, the matrix strength is insufficient, while if too long, it is difficult to disperse. Preferably, the natural fiber is wood pulp fiber with the fiber length of 1.5-6.5 mm, such as: 1.5mm, 2.5mm, 3.5mm, 4.5mm, 5.5mm, 6.5mm, etc.; more preferred are wood pulp fibers of 2.0 to 4.5mm, such as: 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, and the like.

Because the softwood pulp fibers have better water dispersibility and longer length, preferably, the wood pulp fibers are the softwood pulp fibers, and the freeness of the softwood pulp is preferably about 200-700 cc under the condition of using the softwood pulp fibers. The freeness herein was measured by the canadian standard freeness measurement method. If the freeness is less than the lower limit, the nonwoven fabric becomes paper-like and has poor handfeel. If the freeness is higher than the upper limit, the wet strength of the nonwoven fabric decreases.

The regenerated fibers are entangled with the natural fibers, and the matrix 10 is more easily dispersed when the fibers are thin. Preferably, the regenerated fibers have a fiber denier of preferably 12 denier or less, more preferably 7 denier or less, and further have an aspect ratio of 400 to 14000, where the aspect ratio is equal to (fiber length ÷ denier) × 1000.

In one embodiment, the mass ratio of natural fibers to regenerated fibers is 9:1 to 3:7, preferably 8:2 to 1: 1.

Further, the regenerated fibers include a first regenerated fiber and a second regenerated fiber to allow the matrix 10 to satisfy both strength and water dispersibility requirements. In general, the first regenerated fiber and the second regenerated fiber may be two types of fibers having different fiber lengths or two types of fibers having different shapes, respectively. The relatively longer fibers provide the matrix 10 with greater strength, while the relatively shorter fibers are more easily dispersed, and the differently shaped fibers also have different strength and water dispersibility.

When the first regenerated fiber and the second regenerated fiber are two types of fibers of different lengths, the first regenerated fiber length may be 3 to 12mm, for example: 3mm, 5mm, 7mm, 9mm, 11mm, 12mm, etc. The second regenerated fibre length may be 6-20mm, for example: 6mm, 9mm, 12mm, 15mm, 18mm, 20mm, etc. More preferably, the aspect ratio of the first regenerated fibers is in the range of 400 to 3000, the aspect ratio of the second regenerated fibers is in the range of 3000 to 14000, and the aspect ratio of the second regenerated fibers is more than 300 greater than the aspect ratio of the first regenerated cellulose fibers.

Further, the ratio of the first regenerated fiber to the second regenerated fiber is 1:9-9:1, preferably 2:8-5: 5.

In one embodiment, one of the first regenerated fiber and the second regenerated fiber is 1 denier or more and the other is 1 denier or less.

Preferably, the regenerated fibers are viscose fibers, and when the regenerated fibers are viscose fibers, the viscose fibers are at least one of flat viscose fibers and round viscose fibers.

The flat viscose fiber can be obtained by dissolving natural fiber in corresponding solvent and then wet spinning. Flat viscose fibres have less bending stiffness and are more prone to entanglement than round viscose fibres. Generally, the fibers in the matrix can be entangled by their own physical properties, and the entanglement is a friction cohesion effect. It will be appreciated that flat viscose fibres are more easily dispersed in water than round viscose fibres, since they are entangled using less external force than round viscose fibres. If the matrix contains too many flat viscose fibres, then dispersion tends to occur on prolonged immersion in the solution, which in turn leads to poor applicability of the nonwoven. Therefore, the viscose fiber contains flat viscose fiber and round viscose fiber. Preferably, the first regenerated fibers are flat viscose fibers, the second regenerated fibers are round viscose fibers, and the mass ratio of the first regenerated fibers to the second regenerated fibers is 9:1-1:9, more preferably 8:2-1: 1.

When the first regenerated fibers are flat viscose fibers and the second regenerated fibers are round viscose fibers, the flat viscose fibers have a length of 5mm to 30mm, for example: 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, etc., preferably 7mm to 15mm, for example: 7mm, 9mm, 11mm, 13mm, 15mm, and so forth. The round viscose fibres have a length of 4mm to 30mm, for example: 4mm, 10mm, 20mm, 30mm, etc., more preferably 4.5-20mm, for example: 4.5mm, 6mm, 10mm, 15mm, 20mm, and so forth.

More preferably, the matrix contains 64 to 86 parts by mass of wood pulp fiber, 10 to 28 parts by mass of circular viscose fiber and 2 to 8 parts by mass of flat viscose fiber in 100 parts by mass. More preferably, the matrix comprises 74 to 81 parts by mass of wood pulp fiber, 15 to 20 parts by mass of round viscose fiber and 4 to 6 parts by mass of flat viscose fiber in 100 parts by mass.

In addition, the nonwoven fabric can be improved in wet strength without excessively lowering the hydrolyzability by incorporating a water-soluble or water-swellable binder. In the case of containing a binder, the nonwoven fabric preferably contains a water-soluble inorganic salt or organic salt. The binder is preferably an alkyl cellulose, and more preferably further contains: (A) a copolymer of a polymerizable acid anhydride compound and another compound, and (B) an amino acid derivative.

In addition, the nonwoven fabric may contain other fibers, such as: chemical fibers, synthetic fibers such as polypropylene, polyvinyl alcohol, polyester, and polyacrylonitrile, or synthetic pulp composed of biodegradable synthetic fibers or polyethylene. In addition, fibril rayon may be added, which is a fiber finely fibrillated on the surface of regenerated cellulose fiber, that is, a fibril rayon having some fine fibers with a thickness of a submicron order peeled off from the surface of the above fiber. In addition, as fibers suitable for addition, biodegradable fibers that can decompose the nonwoven fabric even when discarded in the natural world are preferred. When other fibers are contained, the mass of the other fibers in the matrix 10 should be 10% or less, and more preferably 7% or less.

In the present invention, in order to make the nonwoven fabric suitable for wiping work in a wet state, the weight per unit area of the substrate 10 is preferably 20 to 100g/m ² . If the weight per unit area is less than the lower limit, the necessary wet strength cannot be obtained. If the weight per unit area is greater than the above upper limit, the flexibility thereof will be deteriorated. Particularly, when the base 10 is used for wiping human skin or the like, the weight per unit area of the base 10 is more preferably 40 to 80g/m from the viewpoint of both wet strength and soft feeling ² 。

A plurality of micro-protrusions 20 are provided on the substrate 10, and a texturing structure 30 is provided on the micro-protrusions 20, in one embodiment, the texturing 30 comprises fluff 30, the fluff 30 comprising portions attached to the base 10 and portions protruding out of the base 10, which, when the nonwoven is to be discarded into water, such as in a toilet, when the water flow is moving, macroscopically, the water flow drives the non-woven fabric to move, the non-woven fabric curls while the water flow drives the non-woven fabric to move, when part of water flow flows through the surface of the non-woven fabric at a bending position, the flow velocity of the water flow increases at the outer side of the bent non-woven fabric and decreases at the inner side of the bent non-woven fabric, according to the Bernoulli principle, part of the water flow flows from the inner side of the curved non-woven fabric to the outer side of the curved non-woven fabric, when the water flow passes through the nonwoven fabric substrate 10, the fibers are easily carried off the substrate 10. Also microscopically, the microprotrusions 20 and the textured structure on the surface of the substrate 10 will serve the following functions due to the flow of water across the surface of the substrate 10:

the first and second microprotrusions 20 provide a drag resistance to water flowing over the microprotrusions 20, and the water flow provides a pulling force on the microprotrusions 20 that tends to pull fibers in the area of the microprotrusions 20 away from the substrate 10;

the second and the micro-protrusions 20 enable water flowing over the surface of the substrate 10 to form turbulence, that is, the water forms pulling force in various directions on the surface of the substrate 10, so that the substrate 10 is easy to break up;

third, the micro-protrusions 20 increase the flow velocity of the water in the area above the micro-protrusions 20 when the water flows over the surface of the substrate 10, and according to bernoulli's principle, the water pressure above the micro-protrusions 20 decreases and the water pressure below the micro-protrusions 20 increases, and the water exerts a force on the substrate 10 in the direction perpendicular to the substrate 10 and toward the height of the micro-protrusions 20.

Fourthly, further, due to the fact that the micro-protrusions 20 are provided with the texturing structures, the fluff 30 of the texturing structures of the micro-protrusions 20 comprises the parts connected with the base body 10 and the parts extending out of the base body 10, and the fluff 30 can easily fall off from the micro-protrusions 20 by combining the above 1-3 water flow effect, when the fluff 30 of the texturing structures falls off from the micro-protrusions 20, the base body 10 at the positions of the micro-protrusions 20 is damaged, the combination of fibers is loose, and the fibers on the base body 10 further fall off.

In addition, when the non-woven fabric is in a dry state or the water flow is in a static state, the non-woven fabric is not easy to disperse due to no water flow effect, so that the strength of the wet tissue is not affected when the non-woven fabric is applied to the wet tissue, and when the water flow effect is applied to the wet tissue, the wet tissue is easy to disperse under the action of the water flow when the toilet is put into the toilet in the flushing process.

From the above description, it is understood that the dispersibility of the nonwoven fabric is affected by the substrate 10, the microprotrusions 20 and the textured structure. Wherein, when the basis weight of the matrix 10 is larger or the density is larger, water is not easy to infiltrate the matrix 10, and the water flow is not easy to act on the matrix 10 when flowing through the surface of the matrix 10, in addition, when the stiffness of the matrix 10 is larger, the matrix 10 is not easy to bend under the action of the water flow, and other phenomena, in addition, the micro-protrusion 20 on the surface of the matrix 10 is too large, so that the hysteresis resistance of the water flow receiving the micro-protrusion 20 is too large, the flow velocity of the water flow on the side of the micro-protrusion 20 is reduced, when the micro-protrusion 20 is too small, the flow bernoulli effect is smaller, when the length of the fuzz 30 of the fuzzing structure extending out of the matrix 10 is longer, the fuzz 30 is more easy to separate from the matrix 10 under the action of the water flow, preferably, the diameter of the micro-protrusion 20 is: 0.05-2.0mm, for example: 0.05mm, 1mm, 1.5mm, 2.0mm, etc., more preferably 0.1-1.0mm, for example: 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1.0mm, etc., it being understood that the diameter of the microprotrusions 20 refers to the average diameter of the microprotrusions 20 projected onto the surface of the substrate 10. The height of the microprotrusions 20 is 0.05-2mm, for example: 0.05mm, 1.0mm, 1.5mm, 2.0mm, etc., but the typical microprotrusions 20 should have a protrusion height of less than 70% of the height of the base 10, preferably a protrusion height of 5% to 55% of the height of the base 10, for example: 5%, 10%, 20%, 30%, 40%, 50%, 55%, etc., more preferably 10% -45%, for example: 10%, 20%, 30%, 40%, 45%, etc. The height of the microprotrusions 20 may be measured using non-contact measurement techniques known in the art or by other methods.

In addition, the distribution of the micro-protrusions 20 on the surface of the substrate 10 may also affect the decomposition of the non-woven fabric, and the preferred distribution density of the micro-protrusions 20 on the surface of the substrate 10 is 5 to 40 per 25 square millimeters, and more preferably 10 to 30 per 25 square millimeters. In addition, it is preferable that the microprotrusions 20 are arranged in an array on the surface of the substrate 10, and in some cases, the microprotrusions 20 may be arranged randomly on the surface of the substrate 10.

The length of the fluff 30 extending out of the substrate 10 is more than or equal to 1mm, and more preferably, the length of the fluff 30 extending out of the substrate 10 is more than or equal to 2 mm. The fluff 30 is preferably wood pulp fiber because wood pulp fiber has good water dispersibility.

The nonwoven fabric may be formed by placing the web of fibers on a continuously moving conveyor belt and directing a high pressure water jet at the web of fibers so that the jet passes from the surface of the web of fibers to the bottom surface thereof and is directed at a drum mask adjacent the web of fibers. The high-pressure water jets continuously impact the fiber mesh so that the individual fibers or bundles of fibers in the fiber mesh have sufficient energy to move from the front to the back of the fiber mesh, and in the process, the fibers or bundles of fibers are interpenetrated and entangled with the fibers in contact with the fibers. At the same time, the jet flow shot to the drum cover is rebounded by the drum cover and penetrates out from the back side, the fiber or the tail end of the fiber which penetrates out from the back side randomly moves from the back side to the front side due to the rebounding action of the high-pressure water jet flow shot to the conveyor belt, and is penetrated and tangled with the contact fiber again, and the other part of the same fiber is also acted by another high-pressure water jet flow to produce the same process. Thus, under the combined action of the high-pressure water jet and the drum cover, fibers, fiber bundles or fiber and fiber bundles are continuously interpenetrated and intertwined. In addition, the high-pressure water jet is sprayed on the drum cover and then rebounds to solidify the fiber web again, and forms a matrix 10, when a plurality of holes are formed in the drum cover, the high-pressure water jet passes through the fiber net sheet and is impacted on the drum cover, water flows to splash everywhere, and the fibers at the positions are forced to move towards the holes of the drum cover and to be intertwined with each other, so that a thin part of the cloth cover is formed; the high-pressure water jet directly penetrates through the part with holes of the drum cover, fibers in the fiber web mainly move in a single direction and are extruded by the fibers in the part without holes of the drum cover to form a longitudinal and transverse fiber collection area, so that micro-protrusions 20 are formed, the micro-protrusions 20 correspond to the holes of the drum cover, in addition, the high-pressure water jet directly penetrates through the fiber web, the fibers in the fiber web mainly move in a single direction, partial fibers in the fiber web are driven to be arranged along with the moving direction of the water flow, and a texturing structure is formed at the same time, the texturing structure comprises fluff 30, the fluff 30 comprises a part connected with the fiber web and a part extending out of the fiber web, and the fiber web can be understood to form a matrix 10, the micro-protrusions 20 and the texturing structure after being dried. Here, the fiber web refers to a fiber sheet in which the fiber direction is uniform to some extent.

The properties of the nonwoven fabric obtained by the water jet treatment vary depending on parameters such as the basis weight of the fiber web, the hole diameter of the nozzles, the number of holes of the nozzles, and the passing speed (treatment speed) at the time of treating the fiber web.

In addition, after the fiber web is formed, it is preferable to apply the water jet treatment to the fiber web without drying it, which is simple in terms of process. In addition, once the web is dried, a hydro-peening treatment may also be applied thereto.

The nonwoven fabric is not limited to the water jet treatment, and may be produced by interlacing fibers with needles, air, or the like.

The wet strength at break (wet strength) of the nonwoven fabric produced by the above method in a wet state is preferably 75g/25mm or more in terms of the mean value of the square root of the nonwoven fabric in the Machine Direction (MD) and the Cross Direction (CD). The longitudinal wet strength and the transverse wet strength are tested by the test method of GB/T12914-2008 paper and paperboard tensile strength, wherein the width of a sample is 50mm, the clamping distance is 50mm, and the stretching speed is 100 mm/min.

However, this value is a standard value always measured in the above-described manner as long as the product has a wet strength substantially the same as the wet strength. It should be noted that if the wet strength is 75g/25mm or more, the wiping work can be sufficiently endured. The wet strength is more preferably 100g/25mm or more.

The nonwoven fabric has a hydrolyzability of 600 seconds or less, preferably 300 seconds or less, more preferably 200 seconds or less. Here, hydrolyzability means that the use of a polymer which conforms to INDA/EDANA: FG502-Slosh box separation test specification, and the time for the non-woven to start to collapse at a certain water amount and a certain frequency of the sloshing, where the collapse is defined as: and separating the first small sample from the non-woven fabric body, wherein the hydrolyzability is the time for starting to be disintegrated in seconds.

However, this value is a standard value always measured according to the above-mentioned method, as long as the product has substantially the same hydrolyzability as that of the hydrolyzability. In order to ensure that the nonwoven fabric is thrown into a toilet bowl and flushed with water without any problem, the hydrolyzability is generally considered to be 600 seconds or less, preferably 300 seconds or less, and more preferably 200 seconds or less.

The nonwoven fabric has excellent hydrolyzability and wet strength even without a binder, and a water-soluble or water-swellable binder capable of binding fibers to each other may be added to the nonwoven fabric as required in order to further improve the wet strength. The nonwoven fabric is excellent in both hydrolyzability and wet strength, and a nonwoven fabric having excellent hydrolyzability and wet strength can be obtained by using a smaller amount of binder than that contained in conventional nonwoven fabrics.

Adhesives include, but are not limited to: alkyl celluloses such as carboxymethyl cellulose, methyl cellulose, ethyl cellulose, and benzyl cellulose, polyvinyl alcohol, and modified polyvinyl alcohol containing a predetermined amount of sulfonic acid groups or carboxyl groups. In this case, a sufficient wet strength can be obtained by adding a small amount of the binder, for example, about 1 to 7g of the binder to 100g of the fiber, and preferably about 2 g. Because these binders are water soluble or water swellable, they dissolve or swell when contacted with large amounts of water. In addition, if the nonwoven fabric contains a water-soluble binder, a method of coating the nonwoven fabric by screen printing or the like may be used. In addition, if the binder is water-swellable, the binder may be incorporated into the nonwoven fabric by mixing the binder with the fiber web during the production of the fiber web.

In addition, when a binder is used, if an electrolyte such as a water-soluble inorganic salt or organic salt is contained in the nonwoven fabric, the wet strength of the nonwoven fabric can be further improved.

The nonwoven fabric may contain other substances within a range not to impair the effects of the present application. For example, a surfactant, a bactericide, a preservative, a deodorant, a humectant, an alcohol such as ethanol, a polyhydric alcohol such as glycerin, and the like can be contained.

The nonwoven fabric of the present application will be described below with reference to specific examples.

Example 1:

the matrix 10 is formed by using wood pulp and viscose, the ratio of the wood pulp to the viscose is approximately 7:3, the hydro-jet forming is carried out, the diameter of the micro-bulge 20 is 0.4mm, the density of the micro-bulge 20 is 20 per 25 square millimeters, the fluff 30 of the texturing structure is wood pulp, the length of the fluff 30 extending out of the matrix 10 is more than 0.5mm, and the length of the fluff 30 extending out of the matrix 10 is the average length.

Comparative examples 1 to 3:

the same wood pulp + viscose as in example 1 was used, and the ratio of wood pulp to viscose was similar to that of example 1, with no micro-protrusions 20 on the surface.

Example 2:

the matrix 10 is formed by using wood pulp and viscose, the ratio of the wood pulp to the viscose is approximately 6:4, the hydro-jet forming is carried out, the diameter of the formed microprotrusions 20 is 0.3mm, the density of the microprotrusions 20 is 25 per 25 square millimeters, the fluff 30 in the fuzz structure is wood pulp, the length of the fluff 30 extending out of the matrix 10 is more than 0.4mm, and the length of the fluff 30 extending out of the matrix 10 is the average length.

Comparative examples 4 to 5:

the same wood pulp + viscose as in example 2 was used, the ratio of wood pulp to viscose was similar to that of example 2, the surface had no microprotrusions 20, and comparative example 5 had a higher basis weight than examples 2 and 4.

Wherein, the hydrolysis test is carried out by adopting the following method:

(1) pretreating a sample: according to the method of INDA/EDANA, the sample to be tested is put into 20L of water and stirred for 30 seconds.

(2) Hydrolysis tests were carried out: and (3) adding 2L of water (with the water temperature of 22 +/-3 ℃) into the shaking box, starting the shaking box and timing when the shaking frequency reaches 33rpm, and recording the time for sample disintegration, wherein the disintegration is to separate a first small sample from the non-woven fabric body.

The test method of the longitudinal dry tension and the transverse dry tension refers to the test method of GB/T24218.3-2010 textile non-woven fabric part 3: determination of breaking Strength and elongation at Break test method, wherein the sample width is 50mm, the nip distance is 100mm, and the tensile speed is 100 mm/min.

The longitudinal wet strength and the transverse wet strength are measured by the test method of GB/T12914-2008 paper and paperboard tensile strength, wherein the width of a sample is 50mm, the clamping distance is 50mm, and the stretching speed is 100 mm/min.

The results of comparing example 1 with comparative example 1, comparative example 2 and comparative example 3 are shown in table 1, and the results of comparing example 2 with comparative example 4 and comparative example 5 are shown in table 2.

TABLE 1

TABLE 2

Sample (I)	Example 2	Comparative example 4	Comparative example 5
				Basis weight, g/m ²	60.2	59.2	57.1
The substrate 10 is composed of	Wood pulp and viscose fiber	Wood pulp and viscose	Wood pulp and viscose fiber
				Water-dispersability of s	590	895	1066
Longitudinal dry tensile force, N/m	813	584	802
				Transverse dry tensile force, N/m	362	284	334
Longitudinal wet tensile force, N/m	221	172	278
				Transverse wet tensile, N/m	119	109	156

As can be seen from table 1, the water dispersibility of example 1 is improved by 138%, 152% and 177% compared with comparative example 1, comparative example 2 and comparative example 3, respectively, and the dry tensile force in the machine direction and the dry tensile force in the transverse direction and the wet tensile force in the machine direction and the wet tensile force in the transverse direction in example 1 are not significantly reduced, and still can meet the use requirements.

As can be seen from table 2, the water dispersibility of example 2 is improved by 151% and 180% compared with comparative example 4 and comparative example 5, and the dry tensile force in the machine direction and the dry tensile force in the transverse direction and the wet tensile force in the machine direction and the wet tensile force in the transverse direction in example 2 are not obviously reduced, and the use requirement can still be met. The nonwoven fabric of the present application has a balanced effect of both hydrolyzability and wet strength; in addition, the nonwoven fabric has good bulkiness and softness.

The present application also provides a wet wipe using the nonwoven fabric as a base material, which is used as a wet wipe for wiping the skin of a person such as the buttocks and the face, and which is also used as a cleaning sheet for cleaning the periphery of a toilet bowl. In this case, in particular, in order to impart a wiping effect to the nonwoven fabric, the nonwoven fabric may contain moisture, a surfactant, alcohols, glycerin, and the like in advance. When the nonwoven fabric is soaked with a cleaning solution and packaged as a product, the nonwoven fabric is sealed and packaged without being dried, and then sold on the market. Of course, the nonwoven fabric may be sold in a dry state, and the purchaser may use the nonwoven fabric after wetting it with water or a chemical solution.

The nonwoven fabric applied to the wet tissue can maintain sufficient wet strength in wiping operation even in a wet state containing water; in addition, the non-woven fabric applied to the wet tissue is easy to disperse in flowing water; the wet tissue comprising the non-woven fabric has good touch, bulkiness and softness.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A nonwoven fabric, characterized in that it comprises:

the surface of the substrate is provided with a plurality of micro-protrusions, and the micro-protrusions are provided with textured structures; the diameter of the micro-bulge is 0.05-2.0 mm;

the height of the micro-bumps is less than 70% of the height of the substrate; the height of the micro-bumps is 0.05-2 mm; the distribution density of the micro-protrusions on the surface of the substrate is 5-40 per 25 square millimeters; the micro-bulges are arranged on the surface of the substrate in an array manner or the micro-bulges are arranged on the surface of the substrate randomly;

the texturing structure comprises pile comprising protruding matrix portions having a length greater than or equal to 1 mm; the nonwoven fabric has a hydrolyzability of 600 seconds or less.

2. The nonwoven fabric of claim 1, wherein the matrix comprises natural fibers and regenerated fibers, and the mass ratio of the natural fibers to the regenerated fibers is 9:1-3: 7.

3. The non-woven fabric according to claim 2, wherein the natural fibers are wood pulp fibers, and the length of the wood pulp fibers is 1.5-6.5 mm; the regenerated fibers include first regenerated fibers and second regenerated fibers, and the first regenerated fibers and the second regenerated fibers are different in length or different in shape.

4. The nonwoven fabric of claim 3, wherein the wood pulp fibers are softwood pulp fibers.

5. The nonwoven fabric of claim 3, wherein the first regenerated fibers have a length of 3 to 12mm and the second regenerated fibers have a length of 6 to 20 mm.

6. The nonwoven fabric of claim 3, wherein the first regenerated fibers are flat viscose fibers and the second regenerated fibers are round viscose fibers; the length of the flat viscose fiber is 5mm-30mm, and the length of the round viscose fiber is 4mm-30 mm.

7. A wet wipe characterized in that it comprises the nonwoven fabric as claimed in any one of claims 1 to 6.