JP7178124B2 - Multi-layer woven structure for humidification - Google Patents

Description

TECHNICAL FIELD The present invention relates to a multi-layered woven structure for humidification that can be suitably used as a humidifying element incorporated in a humidifier, a humidifying air cleaner, or the like.

In recent years, in order to increase the relative humidity in a dry room, a humidifier or a humidified air purifier that humidifies the room by evaporating tap water has been used in ordinary households. Humidifiers or humidified air purifiers incorporate a humidifying element that absorbs and retains water and evaporates the retained water. The humidifying element sucks up water from the water storage tank, retains the water, and evaporates it into the air passing through the humidifying element to produce humidified air. Humidified air is sent indoors, and the indoors is kept at moderate humidity.

Conventionally, a nonwoven fabric has been used as a humidifying element, and for example, a water-absorbing nonwoven fabric sheet using fibers of 3 to 15 μm has been proposed in order to improve water absorption performance (see, for example, Patent Document 1). However, such a water-absorbent sheet structure made of non-woven fabric is difficult to obtain high water-absorbing properties and has low air permeability, so that the water that has entered between the fibers constituting the non-woven fabric cannot be sufficiently evaporated, and the water permeates. However, it was difficult to obtain stable humidification performance over a long period of time because the dirt could not be completely removed.

In order to solve such problems, many three-dimensional knitted humidifying elements have been proposed in recent years. These three-dimensional knitted fabrics are, for example, double raschel knitted fabrics, and consist of a front knitted fabric, a back knitted fabric, and connecting yarns for connecting the two fabrics. For example, Patent Literature 2 describes a humidifying element configured by bundling threads of water-absorbent fibers and non-water-absorbent fibers, in which the wale direction of the knitted fabric is substantially aligned with the height direction of the humidification filter. Further, Patent Document 3 discloses a warp knitted fabric in which through holes are formed between stitch rows knitted in the wale direction, and a row of chain stitch yarns extending straight in the wale direction corresponding to the stitch rows of the warp knitted fabric. , is entwined in each stitch of the chain stitch yarn and is entwined in each stitch of the warp knitted fabric, and consists of a connecting yarn that connects the chain stitch yarn and the warp knitted fabric, and the connecting yarn extending from the chain stitch yarn is a chain stitch yarn is not entwined with the stitch row of the corresponding warp knitted fabric, and the chain stitch yarn is entwined with the stitch row of the warp knitted fabric that is one or more rows left and right with respect to the corresponding warp knitted fabric stitch row It describes a three-dimensional knitted fabric in which the connecting yarns intersect between each course, and it is described that it is possible to provide a humidifying element that increases the water retention capacity and is less likely to become stiff.

By using such a three ^- dimensional knitted humidifying element, water retention and resistance to settling have been improved. In addition, air permeability deteriorates, which causes a decrease in humidification performance and an increase in pressure loss of the blower. In addition, since it is a knitted fabric, it causes deformation of the three-dimensional shape when used for a long time, and there is also a problem that the humidifying element needs to be replaced frequently.

On the other hand, conventionally, a cushion structure is known as a structure having a layered structure in which a large number of communicating voids are arranged along one direction, which is composed of a woven structure substantially composed of fibers (for example, , see Patent Document 4). These cushion structures were developed for the purpose of bedding, vehicle seats, chair seats, floor cushion seats, reception set seats, sports equipment, bedsore prevention sheets for medical and nursing care, and seats for large dogs and pets. and has been put into practical use.

Japanese Patent Application Laid-Open No. 2005-156006 Japanese Patent No. 5493888 Japanese Patent No. 6053148 Japanese Patent No. 4362465

Non-woven fabric sheets and three-dimensional knitted sheets, which have been conventionally used as materials for humidifying elements, have the above-described problems, and thus there is room for further study.

Therefore, the present invention provides a humidifier that has high water retention, good air permeability, high ability to transpire water into the air, has a large porosity, and has little deformation of the three-dimensional shape even after long-term use. It is another object of the present invention to provide a multi-layered woven structure for use.

The humidifying multilayer woven structure according to the present invention is composed of a multilayer woven structure substantially composed of fibers, and is composed of a plurality of low-shrinkage yarns arranged in the warp direction and a plurality of weft yarns arranged in the weft direction. At least one layer structure in which a plurality of curved communicating voids formed by partially interlacing a woven ground texture with a plurality of high-shrinkage yarns arranged in the warp direction are arranged along one direction. The structure has an apparent porosity of 93% or more and 99% or less, a water retention rate of 150% or more and 350% or less, and an air permeability of 300 cm ³ /cm ² /s or more and 550 cm ³ /cm ² /s or less.

Further, the multi-layered woven structure is composed of a plurality of warp yarns that satisfy the following (1) and a plurality of wefts that satisfy the following (2), and the multi-layered woven structure is heat-treated to form a three-dimensional structure. there is
(1) Warp yarns are composed of at least the following yarns A and B.
Yarn A: monofilament with a fineness of 50 dtex or more and 600 dtex or less and a dry heat shrinkage rate of 10% or less Yarn B: a monofilament or multifilament with a fineness of 50 dtex or more and 600 dtex or less and a dry heat shrinkage rate of 20% or more and 50% or less (2 ) The weft yarns are composed of at least the following yarns C;
Yarn C: Design twisted yarn using a monofilament with a fineness of 50 dtex or more and 300 dtex or less as a core yarn and a multifilament with a fineness of 50 dtex or more and 500 dtex or less as a sheath yarn.

Further, the weft yarns include the following yarns D as idle yarns arranged in the communicating voids.
Yarn D: Bulky processed yarn with a fineness of 200 dtex or more and 1000 dtex or less obtained by air processing two or more types of multifilaments

Furthermore, the monofilaments included in yarn A and yarn C are formed to have an irregular cross-sectional shape.

By having the above configuration, the present invention has at least one layer structure in which a plurality of communicating voids are arranged along one direction and which is composed of a multi-layered woven structure. It is possible to achieve high air permeability, and furthermore, the multi-layered structure can significantly improve water retention. In addition, since it is composed of a multi-layered woven structure, it has excellent shape retention and is sufficiently durable even for long-term use in wet conditions.

Such a multilayer woven structure has an apparent porosity E of 93% or more and 99% or less, a water retention rate W of 150% or more and 350% or less, and an air permeability P of 300 cm ³ /cm ² /s or more and 550 cm ³ /cm. A characteristic of ² /s or less can be realized, and it has excellent performance as a humidifying element incorporated in a humidifier, an air cleaner, or the like.

It is an explanatory view showing a section about an embodiment concerning the present invention. FIG. 4 is a partially enlarged perspective view schematically showing a partially enlarged communicating void portion of the humidifying multi-layer woven structure. FIG. 2 is an external image of a cross-sectional view of a multilayer woven structure taken obliquely from above; FIG. It is a schematic diagram regarding the cross-sectional shape of a monofilament.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described in detail. It should be noted that the embodiments described below are preferred specific examples for carrying out the present invention, and thus various technical limitations are made, but the present invention clearly states that the present invention is limited in the following description. Unless otherwise specified, these forms are not intended to be limiting.

FIG. 1 schematically shows a cross-sectional view along the warp direction of an embodiment according to the present invention, and FIG. It is a partial enlarged perspective view showing.

The ground texture N is woven in a plain weave by a plurality of low-shrinkage yarns A, which are warp yarns arranged in the warp direction, and a plurality of weft yarns C (marked with circles) arranged in the weft direction, and is vertically multiple. A large number of low-shrinkage yarns A and high-shrinkage yarns B are arranged and woven in the warp direction. The ground weave N is intertwined and woven into the upper and lower high-shrinkage yarns B alternately.

The ground weave N is formed in a wavy curved state between the interlaced portions F with the high-shrinkage yarns B, and the wavy curvature of the ground weave N creates a large number of communicating voids G along the weft direction. An ordered layered structure M is formed. Since the high-shrinkage yarn B is significantly shrunk by the heat treatment, the portion of the ground structure N other than the entangled portion F is curved to form the communicating gap portion G. As shown in FIG.

In this example, the multi-layer fabric structure has a three-layer structure, but by appropriately increasing or decreasing the number of layers in the multi-layer fabric structure, it is possible to construct a multi-layer structure other than three layers, and there is no particular limitation.

In the layered structure M, the low-shrinkage yarns A forming the ground structure N in the interlaced portion F maintain a space with the upper and lower high-shrinkage yarns B, thereby maintaining the communicating gaps G, and the low-shrinkage yarns A and high-shrinkage yarn B form a truss structure to form the skeleton of the communicating gap G. By weaving the weft C that forms the ground weave N into the low-shrinkage yarn A, the low-shrinkage yarn A as a whole functions as an integrated unit.

Therefore, it has excellent shape retention and has sufficient durability with almost no deformation such as settling even after long-term use. Due to such excellent shape retention, the communicating voids are maintained, and a large void ratio is secured for a long period of time, providing high air permeability.

In addition, idle yarns D (indicated by ● marks) made of design twisted yarns are arranged as wefts in the communicating gaps G, and the idle yarns D are loosely inserted into the communicating gaps G without crossing the warp yarns. placed in a closed state. A plurality of idle threads D can be arranged and are not particularly limited.

FIG. 3 shows a photographed image of an example of the humidifying multi-layer woven structure of the present invention. Since the warp yarns A and weft yarns C constituting the ground weave N are spread over the entire surface of the structure in a grid pattern to form a multi-layered structure, the entire ground weave N retains water and humidifies the entire air passing therethrough substantially uniformly. become. In addition, by arranging the idle thread D in a state in which it is loosely inserted in the communicating gap portion G, it is possible to increase the water retention capacity and the transpiration capacity.

In the multi-layer woven structure, it is possible to manufacture a humidifying element having a wide range of performance by adjusting the number of layers, selection of warp yarns A and B, weft yarn C and idle yarn D, heat treatment conditions during production, and the like. Thus, the multi-layer fabric structure has high water retention, good air permeability, high ability to transpire water into the air, high porosity, and little deformation of the three-dimensional shape even after long-term use. Performance that satisfies the characteristics can be realized, and it is suitable as a humidifying element.

The properties of such a multi-layered woven structure can be quantitatively represented by the apparent porosity E, the water retention W, and the air permeability P.

Here, the "apparent porosity E" is calculated by the following equation (f1).
E (%) = V/U x 100 (f1)
However, V is the apparent volume (cm ³ ) of the sample (length 10 cm x width 10 cm x thickness h cm), U is the fiber volume of the sample, and the weight (g) of the sample is the specific gravity (g/cm ³ ) of the fiber. divided by

The "water retention rate W" is calculated by the following equation (f2).
W (%)=WG/G×100 (f2)
However, G is the weight (g) of the sample (length 10 cm x width 10 cm x thickness h cm), and WG is the weight after immersing the sample in water at 20°C for 1 minute and then leaving it vertically in the air for 1 minute. weight (g)

Regarding "air permeability P", according to JIS L 1096, attach the test piece to the Frazier type testing machine, suck air so that the pressure becomes 125 Pa, measure the air flow rate at that time, and from the air flow rate and the test area Air permeability (cm ³ /cm ² /s) is calculated.

The apparent porosity E is preferably 93% or more and 99% or less. If the apparent porosity E is less than 93%, the air permeability is poor and the ability to evaporate water into the air is not sufficiently exhibited. Moreover, when the apparent porosity E exceeds 99%, it becomes impossible to secure a sufficient water retention capacity.

The water retention W is preferably 150% or more and 350% or less. If the water retention W is less than 150%, sufficient humidification performance cannot be obtained. On the other hand, if the water retention W exceeds 350%, water is absorbed by the fiber itself, and the transpiration property by blowing air becomes poor, which is not preferable.

The air permeability P is preferably 300 cm ³ /cm ² /s or more and 550 cm ³ /cm ² /s or less. If the air permeability P is less than 300 cm ³ /cm ² /s, it is difficult for the blown air to pass through the humidifying element, and the transpiration of water into the air is significantly reduced. Moreover, the pressure loss of the blower is large, and the power consumption is also large. If the permeability P exceeds 550 cm ³ /cm ² /s, the blown air will not be sufficiently humidified, which is not preferable.

As the low shrinkage yarn A used as the warp yarn, a monofilament having a fineness of 50 dtex or more and 600 dtex or less and a dry heat shrinkage rate of 10% or less is preferable.

Here, the "dry heat shrinkage rate S" referred to in the present invention is calculated by the following formula (f3).
S (%) = (L - LS) / L x 100 (f3)
However, L is the yarn length when a load of T/10 (g) is applied to a sample with a fineness T (dtex), and LS is a sample with a fineness T (dtex) that is heat-treated in a dryer at 160 ° C. for 5 minutes. After that, the yarn length when a load of T / 10 (g) is applied

A monofilament is suitable for the low-shrinkage yarn A because it forms the framework of the communicating voids G. However, if the fineness is less than 50 dtex, the rigidity is insufficient and the truss structure serving as the framework is likely to deform. On the other hand, if it exceeds 600 dtex, the permeability P is lowered, the transpiration property is deteriorated, and the water retention W is lowered, which is not preferable. A more preferable fineness is 200 dtex or more and 350 dtex or less. If the dry heat shrinkage rate S exceeds 10%, the communicating gaps G to be formed will shrink, which is not preferable. More preferably, the dry heat shrinkage rate S is 3% or less.

The highly shrinkable yarn B used as the warp yarn is preferably a monofilament or multifilament having a fineness of 50 dtex or more and 600 dtex or less and a dry heat shrinkage of 20% or more and 50% or less.

The multi-layer woven structure becomes a three-dimensional structure in which the high shrinkage yarn B is mainly shrunk by heat treatment after weaving to form the communicating voids G, but if the fineness of the high shrinkage yarn B is less than 50 dtex, the shrinkage force is weak. , exceeding 600 dtex, the pressure loss between the layers increases and the air permeability decreases, which is not preferable. Further, if the dry heat shrinkage rate S is less than 20%, the formed communicating voids G become narrow, so that the porosity E becomes small and the air permeability also deteriorates.

If the dry heat shrinkage rate S exceeds 50%, the curved shape of the communicating gap G becomes acute, and deformation such as settling is likely to occur. More preferably, the dry heat shrinkage rate S is 25% or more and 40% or less.

When the high-shrinkage yarn B is a multifilament, the shrinkage may be due to crimping instead of the shrinkage of the fiber itself. Also, the high-shrinkage yarn B may be a plied yarn of the above-described monofilament or multifilament and another multifilament. For example, a plied yarn obtained by using a multifilament having a fineness of 50 dtex or more and 300 dtex or less and a dry heat shrinkage S of 10% or less as another filament is more preferable because it has water retentivity.

The weft C is preferably a design twisted yarn having a monofilament with a fineness of 50 dtex or more and 300 dtex or less as a core yarn and a multifilament with a fineness of 50 dtex or more and 500 dtex or less as a sheath yarn. Here, the "design twisted yarn" is twisted by overfeeding the sheath yarn by 5% to 40% with respect to the core yarn.

Since the weft yarn C has a function of connecting and holding the communicating voids formed by the warp yarns, the core yarn is preferably a monofilament having a fineness of 50 dtex or more and 300 dtex or less. If the fineness is less than 50 dtex, the rigidity is low and the connecting portion is likely to be deformed. In addition, the weft C can improve the water retentivity by using a design twisted yarn in which sheath yarns made of multifilaments are entwined. By using the design twisted yarn, a gap is generated between the core yarn and the sheath yarn, and it becomes possible to retain moisture by capillary action. As the sheath yarn, a multifilament having a fineness of 50 dtex or more and 500 dtex or less is preferable. If the fineness is less than 50 dtex, sufficient water retention cannot be obtained. Also, the sheath yarn can be composed of two or more types of multifilaments.

The play yarn D used as the weft yarn is preferably a bulky textured yarn having a fineness of 200 dtex or more and 1000 dtex or less, which is obtained by air processing two or more kinds of multifilaments. Here, the “idle yarn” is a weft yarn that does not intersect with the warp yarns existing in the communicating gap. One or a plurality of idle threads D can be arranged in the communicating gap.

As the air processing, taslan processing is preferable. By forming a large number of loop-shaped projections by Taslan processing, water retention is enhanced, and since they are arranged in the communicating voids, air permeability is not impaired and moisture can be easily evaporated. If the fineness of the play yarn D is less than 300 dtex, the water retention is not sufficient, and if it exceeds 1000 dtex, it is not preferable because it occupies a large proportion of the communicating voids and deteriorates the air permeability.

It is more preferable that the monofilaments contained in the low-shrinkage yarn A and the weft D have an irregular cross-sectional shape in order to improve water retention by capillaries. Here, the “variant cross-sectional shape” is a cross-sectional shape other than a round cross-sectional shape of the monofilament. For example, as shown in FIG. 4, a multifilament having a modified cross-sectional shape with grooves formed in the yarn length direction is more preferable. In FIG. 4(a), the cross-sectional shape is cross-shaped, and four grooves are cut out at right angles in the yarn length direction. In FIG. 4(b), the cross-sectional shape is Y-shaped, and three grooves are cut out in the yarn length direction. In FIG. 4(c), the groove is W-shaped, and three grooves are formed alternately in the yarn length direction by sharply cutting the grooves. In FIG. 4(d), four grooves are formed by notching wide widths in the yarn length direction.

The monofilaments or multifilaments contained in the yarns A to D described above are preferably made of polymers, and examples thereof include those made of polymers such as polyester, polyamide, polyvinyl alcohol and polyolefin. More preferably, it is made of a polymer such as polyester or polyamide, which has excellent deformation restoring properties.

The multi-layered woven fabric structure for humidification is woven in a multi-weave structure using a known loom such as a rapier loom by arranging low-shrinkage yarn A and high-shrinkage yarn B as warp yarns and using weft yarn C and idle yarn D as weft yarns. can be manufactured by After weaving, the highly shrinkable yarn B is shrunk by heat setting to cause it to shrink or crimp. At this time, since the low-shrinkage yarn A hardly shrinks, the ground structure N is curved and deformed in a wavy shape between the entangled portions F, so that the communicating gaps G are formed.

The humidifying multi-layer fabric structure can be cut into a disk shape or rectangular shape and used in the same manner as a conventional humidifying element. For example, a disk-shaped humidifying element may be attached to the frame, and the lower part thereof may be immersed in a water tank such as a humidifier. It is also possible to supply humidified air into the room by rotating the humidifying element and passing the air over it, which can be used in conventional humidifiers.

Hereinafter, the present invention will be described based on examples, but the present invention is not limited to the examples.

[Example 1]
<Production of monofilament used for low shrinkage yarn A>
Using commercially available polyethylene terephthalate, a monofilament with a fineness of 230 dtex was produced by a spinning device (manufactured by Uniplus Co., Ltd.). The cross-sectional shape of the monofilament was cross-shaped as shown in FIG. 4(a), and the dry heat shrinkage rate S was 2.3%.

<Production of multifilament used for high shrinkage yarn B>
Using a commercially available polyethylene terephthalate resin copolymerized with 10 mol % of isophthalic acid, a 90 dtex/32 filament multifilament was prepared by a spinning device (manufactured by Technobell Co., Ltd.). The dry heat shrinkage rate S was 33%. The produced multifilament was plied with a polyethylene terephthalate multifilament having a fineness of 85 dtex/36 and a dry heat shrinkage rate S of 3% at a twist number of 160 t/m, and was used as a high shrinkage yarn B.

<Production of Weft C>
A monofilament having a fineness of 140 dtex was prepared using a commercially available polyethylene terephthalate as a core yarn by a spinning device (manufactured by Uniplus Co., Ltd.). The cross section of the monofilament was cross-shaped as shown in FIG. 4(a), and the dry heat shrinkage rate S was 3.0%. As the sheath yarn, a false twisted textured yarn made of polyethylene terephthalate with a fineness of 165 dtex / 48 filaments and a false twisted textured yarn made of polyethylene terephthalate with a fineness of 85 dtex / 36 filaments were used. A design twisted yarn was produced by twisting and used as a weft C.

<Production of idle thread D>
A filament with a fineness of 170 dtex/48 made of polyethylene terephthalate was used as a core yarn, and two filaments of a fineness of 85 dtex/36 made of polyethylene terephthalate were used as sheath yarns and taslan-processed to produce a bulky textured yarn with a fineness of 410 dtex. The obtained bulky textured yarn was used as idle yarn.

<Production of multilayer woven structure>
Using the produced yarns A to D, three-layer multi-layer fabrics were woven with a rapier loom (manufactured by Dornier). The resulting multi-layer fabric was heat treated at 160°C to produce a three-layer multi-layer fabric structure. FIG. 3 is an external image of a cross-sectional portion of the multilayer fabric structure photographed obliquely from above. As in the cross-sectional view shown in FIG. 1, the three-layer ground structure is curved in a wave shape to form a communicating void in the weft direction, and the idler yarn is loosely inserted into the communicating void. I understand.

The multilayer fabric structure had a warp shrinkage of 27% and a weft shrinkage of 7% upon heat treatment. The multilayer fabric structure had a basis weight of 332 g/m ² , an apparent porosity E of 98%, a water retention W of 255%, and an air permeability P of 441 m ³ /cm ² /s.

A humidification element obtained by cutting a multi-layered fabric structure into a circle with a diameter of 180 mm is incorporated into a commercially available air purifier (ACK55 manufactured by Daikin Co., Ltd.), and the amount of humidification (amount of water transpiration per hour) is adjusted by reducing the weight of the water in the water storage tank. When measured, it was 514 g/hr. It was confirmed that the conventional humidifying element has sufficient humidifying performance because it is 460 g/hr.

[Example 2]
In the yarn used in Example 1, the same yarn was used except that the fineness of the monofilament used for the low shrinkage yarn A was 330 dtex, and the fineness of the core yarn made of the monofilament of the weft C was changed to 220 dtex. A multilayer woven structure of layers was produced. The obtained multilayer fabric structure had a basis weight of 407 g/m ² , an apparent porosity E of 97.4%, a water retention W of 275%, and an air permeability P of 403 m ³ /cm ² /s. When it was incorporated into an air purifier in the same manner as in Example 1 and the amount of humidification was measured, it was 554 g/hr.

[Comparative Example 1]
A monofilament with a round cross section made of polyethylene terephthalate (dry heat shrinkage S is 3%; fineness 600 dtex) is used as the low shrinkage yarn A, and 550 dtex made of polyethylene terephthalate copolymerized with 10 mol% of isophthalic acid is used as the high shrinkage yarn B. /96 filament multifilament (dry heat shrinkage S is 35%), and a round cross-section monofilament made of polyethylene terephthalate (dry heat shrinkage S is 3%; fineness 220 dtex) is used as weft C, A three-layer multi-layer woven structure was made in the same manner as in Example 1. The obtained multilayer fabric structure had a basis weight of 698 g/m ² , an apparent porosity E of 96%, a water retention W of 75%, and an air permeability P of 460 m ³ /cm ² /s. Since the water holding degree W was small, it did not have sufficient performance as a humidifying element.

[Example 3]
In the yarn used in Example 2, the same yarn was used except that the monofilament used as the low-shrinkage yarn A and the monofilament used as the core yarn of the weft C had a circular cross section, and three layers were formed in the same manner as in Example 1. A woven structure was produced. The obtained multilayer fabric structure had a basis weight of 410 g/m ² , an apparent porosity E of 97.5%, a water retention W of 205%, and an air permeability P of 413 m ³ /cm ² /s. It was confirmed that it had performance as a humidifying element, but the water retention W was slightly lower than that of Example 1 using a monofilament with a cross-shaped cross-sectional shape, and the capillary action due to the cross-shaped cross-sectional shape effect was confirmed.

[Example 4]
A three-layer multi-layer woven structure was produced in the same manner as in Example 1 using the same yarn as that used in Example 2 except that idle yarn D was not used. The multi-layered fabric structure without loose threads had a basis weight of 380 g/m ² , an apparent porosity E of 98.1%, a water retention W of 187%, and an air permeability P of 453 m ³ /cm ² /s. It was confirmed that the element had performance as a humidifying element, but the water retention rate W was lower than that of Example 2 in which the idle thread was incorporated in the communicating gap, and the idle thread D had a water retention capacity. It was confirmed that it contributed to the improvement.

[Comparative Example 2]
In the yarn used in Example 2, the same yarn was used except that the weft yarn C was only a monofilament core yarn and the play yarn D was not used, and a three-layered multilayer woven structure was produced in the same manner as in Example 1. . The obtained multilayer fabric structure had a basis weight of 340 g/m ² , an apparent porosity E of 98.3%, a water retention W of 135%, and an air permeability P of 460 m ³ /cm ² /s. It had a low water retention W and did not have sufficient performance as a humidifying element.

The multi-layered woven fabric structure for humidification according to the present invention can be suitably used as a humidification element for air cleaners, humidifiers, and the like. For example, it has a function of absorbing a sufficient amount of water from the water storage tray and a function of retaining a sufficient amount of water in the wind-receiving portion of the humidifying element. Therefore, it is useful for a wide range of air-conditioning-related equipment such as household/commercial humidifiers, air purifiers with a humidifying function, air conditioners, and cooling fans.

A: warp (low-shrinkage yarn), B: warp (high-shrinkage yarn), C: weft, D: weft (idle yarn), G: communicating gap, M: layered structure, N... ground structure

Claims (4)

It consists of a multi-layer woven structure substantially composed of fibers , and a ground structure woven with a plurality of low-shrinkage yarns arranged in the warp direction and a plurality of weft yarns arranged in the weft direction is arranged in the warp direction. A structure having at least one layer structure in which a plurality of highly shrinkable yarns and a plurality of curved communicating voids formed by partially entangling are arranged along one direction, the apparent void ratio being 93 % or more and 99% or less, a water retention rate of 150% or more and 350% or less, and an air permeability of 300 cm ³ /cm ² /s or more and 550 cm ³ /cm ² /s or less. The multi-layered woven structure is composed of a plurality of warp yarns satisfying the following (1) and a plurality of wefts satisfying the following (2), and the multi-layered woven structure is heat-treated to form a three-dimensional structure. Item 2. The humidifying multilayer woven structure according to Item 1.
(1) Warp yarns are composed of at least the following yarns A and B.
Yarn A: monofilament with a fineness of 50 dtex or more and 600 dtex or less and a dry heat shrinkage rate of 10% or less Yarn B: a monofilament or multifilament with a fineness of 50 dtex or more and 600 dtex or less and a dry heat shrinkage rate of 20% or more and 50% or less (2 ) The weft yarns are composed of at least the following yarns C;
Yarn C: Design twisted yarn using a monofilament with a fineness of 50 dtex or more and 300 dtex or less as a core yarn and a multifilament with a fineness of 50 dtex or more and 500 dtex or less as a sheath yarn. 3. The humidifying multi-layered woven structure according to claim 2, wherein the weft yarns include the following yarns D as idle yarns arranged in the communicating voids.
Yarn D: Bulky processed yarn with a fineness of 200 dtex or more and 1000 dtex or less obtained by air processing two or more types of multifilaments 4. The humidifying multilayer fabric structure according to claim 2 or 3, wherein the monofilaments included in the thread A and the thread C are formed to have an irregular cross-sectional shape.

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