Wood pulp composite nonwoven materials with unidirectional wicking structure, preparation and applications

Abstract

The application provides a wood pulp composite non-woven material with a one-way wetting structure, preparation and application, comprising the following steps: taking wood pulp fibers to prepare a wet wood pulp fiber web by means of wet laying; taking PLA master batch to prepare PLA fibers by means of melt blowing, and the PLA fibers are melt blown on the surface of the wet wood pulp fiber web to obtain a composite non-woven web; and the composite non-woven web is sequentially subjected to pre-water jetting, front and back water jetting, drying and winding to obtain the wood pulp composite non-woven material with the one-way wetting structure, wherein the front and back water jetting is composed of a plurality of front water jetting processes and a plurality of back water jetting processes, the water jetting energy of the front water jetting is greater than that of the back water jetting, and the obtained wood pulp composite non-woven material has the one-way wetting structure, and can realize rapid water absorption and back penetration at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of non-woven material processing, in particular to a wood pulp composite non-woven material with a one-way wetting structure, preparation and application. BACKGROUND

[0002] Spunlace non-woven fabric is a kind of non-woven fabric that uses high-pressure water jet from a spunlace head to make the fibers in the fiber web displace and move, thereby achieving reinforcement forming. Compared with other types of non-woven fabrics such as spun-bonded, spunlace non-woven fabric has the characteristics of soft hand feeling, good drape, good air permeability, etc. In the reinforcement process, no chemical adhesive is needed, so the spunlace non-woven fabric has the advantages of green environmental protection, and is often used in medical protection, wiping, incontinence hygiene and other fields.

[0003] At present, in order to improve the water absorption of spunlace non-woven fabric material, fibers with strong water absorption such as wood pulp and viscose are usually selected as raw materials. For absorbent spunlace non-woven material, especially incontinence hygiene spunlace non-woven material, in addition to improving the water absorption of the material and reducing the absorption time, it should also ensure that it will not produce reverse osmosis after saturation. Considering that the incontinence hygiene spunlace non-woven material is mostly directly in contact with the user's skin, if reverse osmosis occurs, the absorbed body fluid will re-contact the skin surface, causing discomfort to the user and even causing skin rash and other skin health problems. Therefore, the ability to effectively absorb liquid while having anti-reverse osmosis function is one of the key factors for incontinence hygiene spunlace non-woven material to gain user trust. SUMMARY

[0004] The purpose of the present application is a wood pulp composite non-woven material with a one-way wetting structure, preparation and application. On-line melt-blown polylactic acid fibers are prepared on a wet-process wood pulp fiber web, and the water jet energy of the front and back surfaces is controlled to make the obtained wood pulp composite non-woven material have a one-way wetting structure, achieving fast water absorption while also achieving reverse osmosis.

[0005] To achieve the above purpose, as shown in Figure 1 The technical scheme provides a preparation method of a wood pulp composite non-woven material with a one-way wetting structure, which comprises the following steps:

[0006] S1: wood pulp fibers are taken to prepare a wet-process wood pulp fiber web by wet-laying;

[0007] S2: PLA masterbatch is used to prepare PLA fibers by melt-blown, and the PLA fibers are melt-blown on the surface of the wet-process wood pulp fiber web to obtain a composite non-woven web;

[0008] S3: obtaining the wood pulp composite nonwoven material with unidirectional wetting structure by sequentially pre-water jetting, front and back water jetting, drying and winding the composite nonwoven web, wherein the front and back water jetting is composed of a plurality of front water jetting processes and a plurality of back water jetting processes, and the water jetting energy of the front water jetting is greater than that of the back water jetting.

[0009] It should be noted that the present scheme directly melts and sprays PLA fibers on the wet wood pulp fiber web through the online melt spraying process, and inserts the PLA fibers on the front surface into the upper layer of the wet wood pulp fiber web through the water jetting process with different conditions on the front and back surfaces. Not only can the strength of the PLA fibers obtained by melt spraying be reinforced, but also the pores between the fibers of the upper layer of the wet wood pulp fiber web can be made smaller, thereby realizing the unidirectional wetting structure with different sizes of pores in the upper and lower layers of the wood pulp composite nonwoven material. The unidirectional wetting structure achieves the effect of unidirectional and rapid water absorption through the differential capillary effect.

[0010] In step S1, wood pulp fibers are dispersed to prepare wood pulp slurry, and the wood pulp slurry is sent to a wet laying device for wet laying to obtain a wet wood pulp fiber web. The reason why the present scheme selects the wet wood pulp fiber web is that the wood pulp fiber has a natural porous structure, which can effectively absorb and transport water while maintaining good air permeability.

[0011] In some embodiments, the length of the wood pulp fiber selected by the present scheme is 2-5 mm, and the width is 10-50 μm.

[0012] In step S2, PLA fibers are sprayed on the wet wood pulp fiber web through the online melt spraying process. Unlike the traditional scheme of water jetting the composite fabric again, the present scheme covers the PLA fibers obtained by melt spraying on the surface of the wet wood pulp fiber web, which can be inserted into the wet wood pulp fiber web through the subsequent front and back water jetting process, thereby changing the size of the upper and lower layer pores in the composite nonwoven web by adjusting the water jetting energy.

[0013] In some embodiments, the diameter of the PLA fiber obtained by melt spraying is 1-10 μm, and the volume fraction of the PLA fiber is about 10%-30% of the wood pulp fiber. Since the PLA fiber is thin and the wood pulp fiber is wide, the mixture of the PLA fiber and the wood pulp fiber can reduce the pores of the upper layer of the composite nonwoven web, increase the porosity, and finally form small and deep pores in the upper layer of the web.

[0014] In some embodiments, the PLA master batch is sent to a double screw extruder, and the PLA master batch is completely melted into a uniform PLA melt by heating. After removing impurities, the PLA melt is conveyed to a melt spraying assembly for melt spraying to prepare PLA fibers. The PLA fibers obtained by melt spraying are directly laid on the surface of the previously prepared wet wood pulp fiber web.

[0015] In step S3, the composite nonwoven web is pre-hydroentangled, wherein the pre-hydroentanglement water energy is controlled at 30-50 kJ / kg. The purpose of pre-hydroentanglement of the composite nonwoven web in this solution is to promote initial physical entanglement between the PLA fibers and the wood pulp fibers, thereby increasing the initial stability of the web structure.

[0016] In some embodiments, a hydroentanglement head with circular nozzle holes is used to pre-hydroentangle the composite nonwoven web, with the hole diameter ranging from 0.20 to 0.25 mm. This design has the advantage of ensuring that the pre-entanglement water flow impacts the composite nonwoven web in a uniform and concentrated manner, penetrating the fiber layer with sufficient force without causing excessive damage, thereby ensuring sufficient penetration and maintaining fiber integrity.

[0017] In some embodiments, the present solution performs front and back hydroentanglement on a pre-hydroentangled composite nonwoven web, wherein the hydroentanglement energy of multiple front hydroentanglement processes first increases and then decreases, and the hydroentanglement energy of multiple back hydroentanglement processes first increases and then decreases, and the hydroentanglement energy of each front hydroentanglement process is greater than the hydroentanglement energy of the back hydroentanglement process.

[0018] It should be noted that the hydroentanglement of the surface of the composite nonwoven web provided with PLA fibers is performed in the front hydroentanglement process. In some specific embodiments, the front and back hydroentanglement process comprises multiple front hydroentanglement processes and multiple back hydroentanglement processes in sequence. In other words, the front hydroentanglement process is performed on the surface provided with PLA fibers first, and then the back hydroentanglement process is performed.

[0019] In some embodiments, a water jet head with a circular nozzle water hole is used to perform frontal water jet on the composite nonwoven web, and a boost diversion baffle is provided between the water jet head and the composite nonwoven web, wherein the boost diversion baffle is provided with a plurality of boost diversion holes, and each boost diversion hole is composed of a frustum portion and a hexagonal portion.

[0020] like Figure 3 As shown, the boost diversion baffle 10 of this solution is provided with a plurality of boost diversion holes 11. Figure 4 As shown, the truncated cone portion 111 and the hexagonal portion 112 of each supercharging diverter hole 11 are connected. The cross-section of the truncated cone portion 111 is circular, and the diameter of the circular cross-section decreases as it approaches the hexagonal portion 112. The cross-section of the hexagonal portion 112 is hexagonal, and the area of ​​the hexagonal cross-section decreases as it approaches the truncated cone portion 111. In other words, the circular opening cross-section of the truncated cone portion 111 of the supercharging diverter hole 11 gradually decreases as it approaches the hexagonal portion 112, while the hexagonal opening cross-section of the hexagonal portion 112 of the supercharging diverter hole 11 gradually decreases as it approaches the truncated cone portion 111.

[0021] It should be noted that the circular truncated cone part 111 of the booster flow hole 11 is arranged close to the hydroentangling head of the front hydroentangling process. Since the opening cross section of the booster flow hole 11 is gradually changed from a large circle to a small circle and then to a hexagonal star, the cross section is first reduced and then gradually increased, so that the water flow energy of the front hydroentangling process is further increased along the water needle energy, and then dispersed into fine water needles along the edge corners through the hexagonal star cross section, and the water needles between the plurality of booster flow holes 11 on the booster flow baffle 10 intersect with each other, so as to well insert the PLA fibers into the wood pulp fibers.

[0022] In some embodiments, the six corners of the hexagonal opening cross section of the six prong part 112 of the booster flow hole 11 of the present scheme are uniformly distributed, and the booster flow holes 11 on the booster flow baffle 10 are also uniformly arranged.

[0023] Specifically, the diameter of the circular opening cross section of the circular truncated cone part 111 of the booster flow hole 11 is gradually reduced from 1.0-1.2 mm to 0.5-0.8 mm, and the diagonal size of the six prong part 112 ranges from 1.3-1.5 mm.

[0024] In some specific embodiments, the front and back hydroentangling is composed of 4 front hydroentangling processes, and the nozzle water jet holes of the hydroentangling head of each front hydroentangling process are designed as circles. The booster flow baffle is arranged between the 4 front hydroentangling processes and the composite non-woven fabric.

[0025] Specifically, the diameter of the circular opening cross section of the circular truncated cone part 111 of the booster flow hole 11 is gradually reduced from 1.0-1.2 mm to 0.5-0.8 mm, and the diagonal size of the six prong part 112 ranges from 1.3-1.5 mm.

[0026] In some embodiments, the composite non-woven web is subjected to back hydroentangling using a hydroentangling head with circular nozzle water jet holes, and a pressure reduction baffle is arranged between the hydroentangling head and the composite non-woven web. The pressure reduction baffle is provided with a plurality of pressure reduction holes, and the opening of each pressure reduction hole gradually increases.

[0027] As shown in Figure 5 , the pressure reduction baffle 20 of the present scheme is provided with a plurality of pressure reduction holes 21. As shown in Figure 6 , each pressure reduction hole 21 is designed as a horn shape with a gradually increasing cross-sectional opening area, and the minimum cross-sectional opening area of the pressure reduction hole 21 corresponds to the arrangement of the hydroentangling head. In some embodiments, the cross-sectional opening of the pressure reduction hole 21 is designed as a circular hole, and specifically, the diameter of the cross-sectional opening of the pressure reduction hole 21 gradually increases from 0.5-0.8 mm to 1.0-1.2 mm.

[0028] The advantage of such an arrangement is that the water needle energy of the reverse water jet process is small and gradually increases with the hole diameter of the pressure-reducing baffle, and the water needle energy is appropriately reduced, and large and shallow pores are formed in the lower half of the web.

[0029] In some embodiments, the front and back water jet is composed of 4 reverse water jet processes, and the nozzle water jet holes of the water jet head of each reverse water jet process are designed as circles, and the pressure-reducing baffles are arranged between the 4 reverse water jet processes and the composite non-woven fabric.

[0030] Specifically, the pore size of the water jet head of the reverse water jet is 0.5-0.8 mm, the water jet energy of the water jet head of the first reverse water jet is 50-60 kJ / kg, the water jet energy of the water jet head of the second reverse water jet is 80-100 kJ / kg, the water jet energy of the water jet head of the third reverse water jet is 80-100 kJ / kg, and the water jet energy of the water jet head of the fourth reverse water jet is 50-60 kJ / kg.

[0031] As shown in Figure 2 , Figure 2 is a schematic diagram of a preparation production line of wood pulp composite non-woven material with one-way wetting structure provided by the present scheme, in which the wood pulp fibers are first subjected to wet laying to obtain a wet wood pulp fiber web and placed on a web conveying curtain for conveying, PLA fibers are melt-blown on the surface of the wet wood pulp fiber web using a melt-blown spinneret to obtain a composite non-woven web, then the composite non-woven web is pre-water jetted using a pre-wetting water jet head, then the composite non-woven web obtained by pre-water jetting is subjected to front water jetting and back water jetting and then sent to a dryer for drying, and finally wound.

[0032] In a second aspect, the present scheme provides a wood pulp composite non-woven material with one-way wetting structure, which is prepared according to the preparation method of the wood pulp composite non-woven material with one-way wetting structure provided in the first aspect. The wood pulp composite non-woven material has a one-way wetting structure with small and deep pores in the upper half layer and large and shallow pores in the lower half layer.

[0033] In a third aspect, the present scheme provides an application method of a wood pulp composite non-woven material with one-way wetting structure, which uses the wood pulp composite non-woven material with one-way wetting structure prepared in the second aspect for incontinence water absorption products.

[0034] Compared with the prior art, the present technical scheme has the following characteristics and beneficial effects:

[0035] The scheme sprays polylactic acid (PLA) fibers on the wet wood pulp fiber web through the online melt-blown process, increases the pressure distribution baffle and the pressure reduction baffle between the water jet head and the web conveying curtain, adjusts the water needle energy of the front and back water jet, realizes different sizes of pores on the upper and lower layers of the wood pulp composite non-woven fabric, and achieves the effect of one-way rapid water absorption through the differential capillary effect. Under the same raw materials and grammage, the water absorption time of the water jet non-woven fabric is reduced, the overall thickness of the material is uniform, and the hand feeling is soft. In particular, the water needle energy of the front water jet process part of the scheme is large, and the pore diameter of the pressure distribution baffle gradually decreases, and the water needle energy further increases, and then the water needle is dispersed into fine water needles along the edge angle through the hexagonal star cross section, and the water needles between multiple holes intersect with each other. The strength of the melt-blown PLA fiber is low, the water needle will insert the melt-blown PLA fiber into the wood pulp fiber web on the upper layer, which can enhance the strength of the melt-blown fiber. At the same time, because the melt-blown PLA fiber is thin (about 1-10 μm) and the wood pulp fiber is wide (10-50 μm), the mixing of PLA and wood pulp fibers can reduce the pore size of the upper layer of the fiber web to increase the porosity, and finally form small and deep pores on the upper layer of the fiber web. Correspondingly, the water needle energy of the back water jet process is small, and the pore diameter of the pressure reduction baffle gradually increases, and the water needle energy appropriately decreases, and large and shallow pores will be formed in the lower part of the fiber web. The pore size between the upper and lower layers gradually increases, and finally achieves the effect of one-way moisture absorption. In addition, the water jet process of the scheme is divided into multiple channels, including pre-water jet, and the water needle energy first gradually increases, then gradually decreases, and finally disappears, which is also beneficial to eliminate the internal stress of the fiber web. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a preparation process schematic diagram of a wood pulp composite non-woven material with a one-way moisture guiding structure provided by the scheme.

[0037] Figure 2 is a structure schematic diagram of a preparation production line of a wood pulp composite non-woven material with a one-way moisture guiding structure provided by the scheme.

[0038] Figure 3 is a structure schematic diagram of a pressure distribution baffle provided by the scheme.

[0039] Figure 4 is a structure schematic diagram of a pressure distribution hole provided by the scheme.

[0040] Figure 5 is a structure schematic diagram of a pressure reduction baffle provided by the scheme.

[0041] Figure 6 is a structure schematic diagram of a pressure reduction hole provided by the scheme.

[0042] Figure 7is a SEM image of the upper half layer of the wood pulp composite nonwoven material with a one-way wetting structure prepared in Example 1.

[0043] Figure 8 is a SEM image of the lower half layer of the wood pulp composite nonwoven material with a one-way wetting structure prepared in Example 1.

[0044] In the figure: booster shunt baffle 10, booster shunt hole 11, circular platform part 111, six prism part 112, pressure reducing baffle 20, pressure reducing hole 21. DETAILED DESCRIPTION

[0045] 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. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application belong to the scope of protection of the present application.

[0046] Those skilled in the art should understand that in the disclosure of the present application, the orientations or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the present application.

[0047] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0048] Example 1

[0049] S1: Wood pulp fibers with a length of 3 mm and a width of 20 μm were dissolved in a beater, and the pulp concentration was set to 0.08%, and then the pulp was dewatered on an inclined screen former to form a wet wood pulp fiber web, and the speed of the inclined screen former was 2 mm / min;

[0050] S2: PLA fibers with a thickness of 8 μm were prepared by melt blowing with PLA masterbatch, and the volume fraction of the PLA fibers was 10% of the wood pulp fibers, and the PLA fibers were melt blown on the surface of the wet wood pulp fiber web to obtain a composite nonwoven web;

[0051] S2: add PLA masterbatch into the hopper of the melt blowing machine, the MFI of which is 30 g / 10 min, the temperature of the melt blowing die is set to 185 ℃, the receiving distance of the web curtain is 20 cm, the diameter of the PLA fiber prepared by melt blowing is 8 μm, and the volume fraction of the PLA fiber is controlled to be 10% of the wood pulp fiber, and the PLA fiber is melt blown on the surface of the wet wood pulp fiber web to obtain a composite nonwoven web;

[0052] S3: the composite nonwoven web is sequentially subjected to pre-water jetting, front and back water jetting, drying and winding to obtain a wood pulp composite nonwoven material with a unidirectional wetting structure, wherein the water jetting holes for pre-water jetting are circular, the hole diameter ranges from 0.22 mm, and the water needle energy is 40 kJ / kg; the water jetting holes for the four front water jetting are all circular, the hole diameter ranges from 1.1 mm, and the water jetting energy is 110 kJ / kg, 160 kJ / kg, 150 kJ / kg and 100 kJ / kg, respectively; the hole diameter of the circular opening cross section of the circular cone part of the pressure-dividing hole gradually decreases from 1.1 mm to 0.7 mm, and the diagonal size of the six-pronged part ranges from 1.4 mm; the water jetting holes for back water jetting are all circular holes, the hole diameter ranges from 0.7 mm, and the water jetting energy is 55 kJ / kg, 90 kJ / kg, 90 kJ / kg and 55 kJ / kg, respectively; the hole diameter of the cross section opening of the pressure-reducing hole gradually increases from 0.7 mm to 1.1 mm.

[0053] SEM testing is performed on the wood pulp composite nonwoven material with a unidirectional wetting structure prepared in step S3 to obtain the SEM image of the upper half layer as shown in Figure 7 , and the SEM image of the lower half layer as shown in Figure 8 , it can be seen that the pores between the wood pulp fibers in the lower half layer are larger, while the PLA fibers are added in the upper half layer by using the online melt blowing process, combined with the water jetting of the pressure-dividing and dividing baffle, the PLA fibers are well mixed into the wood pulp fibers, occupying the pores between the wood pulp fibers, and finally obtaining a wood pulp composite water jetting nonwoven material with smaller front pores and larger back pores.

[0054] Comparative Example One

[0055] Other conditions are the same as in Example One, except that no melt blown PLA fiber is added and no pressure-dividing and pressure-reducing baffles are added.

[0056] Comparative Example Two

[0057] Other conditions are the same as in Example One, except that melt blown PLA fiber is added and no pressure-dividing and pressure-reducing baffles are added.

[0058] Wetting performance test:

[0059] The moisture permeability test is carried out on Example 1, Comparative Example 1 and Comparative Example 2, wherein the liquid penetration time test refers to the GB / T 24218.8-2010 standard, and the rewet amount refers to the GB / T 24218.14-2010 standard, and the test results are shown in Table 1 below:

[0060] Table 1 Moisture permeability test results

[0061]

[0062] The present application is not limited to the above best mode, and anyone can derive other various forms of products under the inspiration of the present application, but regardless of any changes in shape or structure, any technical solution with the same or similar to the present application falls within the scope of the present application.

Claims

1. A method for preparing a wood pulp composite nonwoven material with a unidirectional moisture-conducting structure, characterized in that: The following steps are involved: S1: wet-laid wood pulp fibers are prepared to obtain a wet-laid wood pulp fiber web; S2: PLA masterbatch is melt-blown to obtain PLA fibers, and the PLA fibers are melt-blown on the surface of a wet-laid wood pulp fiber web to obtain a composite nonwoven web; S3: Pre-spunlacing, front and back spunlacing, drying, and winding the composite nonwoven web in sequence to obtain a wood pulp composite nonwoven material having a unidirectional moisture-conducting structure, wherein the front and back spunlacing comprises a plurality of front spunlacing processes and a plurality of negative spunlacing processes, and the spunlacing energy of the front spunlacing is greater than the spunlacing energy of the negative spunlacing; A hydroentanglement head with a circular nozzle spray hole is used to perform front hydroentanglement on the composite nonwoven web, and a boost diversion baffle is provided between the hydroentanglement head and the composite nonwoven web, wherein the boost diversion baffle is provided with a plurality of boost diversion holes, each of which is composed of a truncated cone portion and a hexagonal portion. The truncated cone portion and the hexagonal portion of each boost diversion hole are connected, and the circular opening cross-section of the truncated cone hole of the boost diversion hole gradually decreases in the direction approaching the hexagonal portion, and the hexagonal opening cross-section of the hexagonal portion of the boost diversion hole gradually decreases in the direction approaching the truncated cone surface. A hydroentanglement head with a circular nozzle water hole is used to hydroentangle the composite nonwoven web on the back side, and a pressure reduction baffle is provided between the hydroentanglement head and the composite nonwoven web, wherein the pressure reduction baffle is provided with multiple pressure reduction holes, and the opening of each pressure reduction hole gradually becomes larger.

2. The method for preparing the wood pulp composite nonwoven material with a unidirectional moisture-conducting structure according to claim 1, characterized in that: The diameter of PLA fibers obtained by meltblowing is 1~10μm, and the width of wood pulp fibers is 10~50μm.

3. The method for preparing the wood pulp composite nonwoven material with a unidirectional moisture-conducting structure according to claim 1, characterized in that: The spunlace energy of the multi-pass front spunlace process first increases and then decreases, while the spunlace energy of the multi-pass back spunlace process first increases and then decreases, and the spunlace energy of each front spunlace process is greater than the spunlace energy of the back spunlace process.

4. The method for preparing the wood pulp composite nonwoven material with a unidirectional moisture-conducting structure according to claim 1, wherein: The aperture range of the circular opening cross section of the truncated cone portion of the boost diverter hole gradually decreases from 1.0~1.2 mm to 0.5~0.8 mm, and the diagonal size range of the hexagonal portion is 1.3~1.5 mm.

5. The method for preparing the wood pulp composite nonwoven material with a unidirectional moisture-conducting structure according to claim 1, characterized in that: The front and back spunlace consists of four front spunlace processes. The spunlace energy of the spunlace head in the first front spunlace is 100~120 kJ / kg, the spunlace energy of the spunlace head in the second front spunlace is 150~180 kJ / kg, the spunlace energy of the spunlace head in the third front spunlace is 150~180 kJ / kg, and the spunlace energy of the spunlace head in the fourth front spunlace is 100~120 kJ / kg.

6. A wood pulp composite nonwoven material with a unidirectional moisture-conducting structure, characterized in that: The wood pulp composite nonwoven material with a unidirectional moisture-conducting structure is prepared according to the preparation method of any one of claims 1 to 5.

7. A method for applying a wood pulp composite nonwoven material having a unidirectional moisture-conducting structure, characterized in that: The wood pulp composite nonwoven material with a unidirectional moisture-conducting structure as claimed in claim 6 is applied to incontinence water products.

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