KR102093682B1 - Nonwoven fabric - Google Patents

Abstract

The present invention has high absorbency and release power of liquids such as water and chemical liquids, and also has excellent bulkiness and flexibility, and has little irritation to the skin from the touch, and at the same time, for cleaning and beauty for adults with good wipeability. Provides a non-woven fabric suitable for wiper use. The nonwoven fabric of the present invention is a nonwoven fabric composed of 20 to 80 mass% of multi-leaf flat cross-section polyester fiber and 20 to 80 mass% of cellulose-based fiber, wherein the cross-sectional shape of the multi-leaf flat cross-section polyester fiber is 6 or more convex on the circumference. It is a non-woven fabric formed by blending polyester-based fibers having a flatness and a moldability defined by flatness.

Description

Nonwoven fabric {NONWOVEN FABRIC}

The present invention relates to a non-woven fabric that is suitably used for cosmetic or cleaning of the skin in that it has excellent absorbency and has high water retention properties such as water or chemicals, and also excellent bulkiness, flexibility, and touch. The present invention has a high liquid retaining property of a cosmetic liquid when used for cosmetic purposes, has the ability to release a cosmetic liquid if necessary, and has a high wiping property without damaging the skin during cleaning, and wipes off dirt. Relates to a non-woven fabric suitable for a wiper that can be held in a non-woven fabric and prevent re-contamination.

Conventionally, various non-woven fabrics have been proposed as non-woven fabrics for cleaning adults used in a wet state. For example, by containing 40 to 77% by mass of the polyester fiber and the polyolefin-based fiber in the whole nonwoven fabric, the sedimentation property of the volume during wetting is prevented, and a flexible nonwoven fabric is proposed (see Patent Document 1). .). However, the nonwoven fabric of this proposal has good tactile properties by using polyolefin-based fibers, but there is a problem that the liquid retaining property is poor because the stiffness is not sufficient and a sufficient volume cannot be obtained, and the cleaning properties are also insufficient.

In addition, by using release cross-section fibers and fibrillated fibers, non-woven fabrics for wipers having excellent bulkiness, wiping properties, and practical use have been proposed (see Patent Document 2). However, if the fiber is of a cross-section, it does not improve the retention and cleaning properties of the non-woven fabric, regardless of the shape, and fibrillated fibers often have a sharp fiber cross-section, which may damage the skin when used for adult cleaning. There was a task.

In addition, a nonwoven fabric including release cross-section fibers having a hollow portion has been proposed as a nonwoven fabric having both retaining properties and cleaning properties (see Patent Document 3). In the case of the nonwoven fabric according to this proposal, the retaining property is improved due to the cross-sectional shape, but there is a problem that the retaining performance is not sufficient because the shape retaining property is poor, such as the hollow being distorted.

In addition, a sheet material for absorbent articles has been proposed, characterized in that the main fiber has a flatness of less than 2.0 in the cross-sectional shape of a single fiber, and has two or more openings having an opening angle of less than 120 degrees, and has excellent tensile strength and moisture permeability ( See Patent Document 4.). However, although the nonwoven fabric of this proposal has good anti-permeability property due to diffuse reflection of light, there is a problem that the flexibility of the nonwoven fabric is not sufficient because the flatness is low.

Japanese Patent Publication 2010-84297 Japanese Patent Publication 2010-81987 Japanese Patent Publication 2009-79320 Japanese Patent Publication 2012-197546

Therefore, the object of the present invention is to have a high absorbency and release power of a liquid that could not be achieved with the above-mentioned prior art or only natural fibers and cellulose fibers, and also has moderate bulkiness and flexibility, less irritation to the skin from touch, and wipe It is to provide a non-woven fabric suitable for wiper applications such as cleaning and beauty for adults with good immunity.

In order to solve the above problem, the present invention can improve the wiping property without damaging the skin by using a combination of flat multi-leaf single-sided polyester-based fibers and cellulose-based fibers, and also absorb liquid when used with liquids. It has been achieved to improve the and retaining power and to find a liquid that can release a liquid when used.

That is, the nonwoven fabric of the present invention is a nonwoven fabric comprising 20 to 80% by mass of a flat multi-leaf single-sided polyester fiber and 20 to 80% by mass of a cellulose-based fiber, wherein the cross-sectional shape of the flat multi-leaf single-sided polyester fiber is 6 or more convex. The flattened multi-leafed polyester fiber having a section has a maximum cross-sectional length of A, a maximum width of B, and a maximum length of the line connecting the vertices of adjacent convexities in the maximum irregularities C, and the apex of the convexity It is a nonwoven fabric characterized by satisfying the flatness of the following formula (1) and the degree of release of the following formula (2) at the same time when the length of the water line falling from the line connecting them to the bottom of the recess is D.

Flatness (A / B) = 2.0 to 3.0 ... (1)

Mold release rate (C / D) = 1.0 to 5.0 (2)

According to a preferred form of the nonwoven fabric of the present invention, the maximum length (A) of the cross-section of the multi-leaf flat cross-section polyester fiber is set as a symmetry axis, and the maximum cross-section width (B) of the line segments between the two convex abutting portions is excluded. When the longest length is E, the convex ratio defined by the following formula (3) is satisfied.

Convex ratio (E / B) = 0.6 to 0.9 ... (3)

According to a preferred aspect of the nonwoven fabric of the present invention, the monofilament fineness of the flat multi-leaf cross-section polyester fiber is 2.0 dtex or less.

The nonwoven fabric of the present invention is particularly preferably used as a nonwoven fabric for wipers.

(Effects of the Invention)

ADVANTAGE OF THE INVENTION According to this invention, it has high absorbing liquid power and release property of liquids, such as water and a chemical liquid, and also has moderate bulkiness and flexibility, has little irritation to skin, and has good wipeability, and is especially suitable for cleaning and beauty for adults. A nonwoven fabric suitable for a dragon or the like is obtained.

1 is a cross-sectional view for illustrating a cross-sectional shape of a multi-leaf flat cross-section polyester fiber provided by the nonwoven fabric of the present invention having a plurality (eight) convex portions on the circumference of the fiber cross-section.

Next, the nonwoven fabric of the present invention will be described in detail.

The cellulose fiber used in the present invention is selected from at least one kind of cellulose fiber from natural fibers such as hemp, cotton and silk, regenerated fibers such as viscose rayon, cupra and solvent spinning cellulose, and semisynthetic fibers such as acetate. Is selected. Among them, recycled fibers such as viscose rayon and solvent-spun cellulose are preferably used from the viewpoint of handling and versatility.

It is preferable that the cellulose-based fibers used in the present invention have any cross-sectional shape in a flat shape having irregularities on the circumference. The larger the number of irregularities on the circumference, the higher the liquid absorbency, and the smaller the amount of water stains by uniformly diffusing the liquid on one side of the nonwoven fabric by capillary action.

The number of convex portions on the circumference is preferably 5 or more, more preferably 8 or more. Moreover, it is preferable that the shape of the uneven portion is a shape curved from the viewpoint of touch.

In addition, the short fiber fineness of the cellulose-based fibers is preferably 1.0 to 5 dtex. The short fiber fineness is more preferably 1.2 to 2.2 dtex. When the short fiber fineness is less than 1.0 dtex, it is easy to wind around the cylinder of the card, and the process passability may be significantly reduced. As a result, unevenness of the cloth of the nonwoven fabric is likely to occur. In addition, when the fineness of the short fibers exceeds 5 dtex, the texture of the nonwoven fabric becomes hard, especially when used for adults, indicating an unfavorable tendency in use. In addition, since the pores between the fibers become too large as the short fibers become thick, the retaining property tends to be remarkably reduced.

From the viewpoint that the fiber length of the cellulose-based fiber is high in inter-engagement with other constituent fibers such as polyester-based fibers, maintains liquid absorbency, liquid retention and release properties, and obtains a non-woven fabric having a uniform feel, etc., with good productivity. Is preferably 30 to 80 mm. The fiber length is more preferably 35 to 64 mm. As a commercial item of cellulose fiber, rayon etc. by Daiwabow Rayon of Japan are mentioned.

In the nonwoven fabric of this invention, the content rate of the said cellulose fiber is 20-80 mass%. When the mixing rate (content) of the cellulose-based fiber is less than 20% by mass, the absorbency of impregnating the liquid is weakened, so that the force of retaining moisture in the nonwoven fabric is weak, and liquid is unnecessarily flowed out of the nonwoven fabric during use. In addition, in the nonwoven fabric of the present invention, the softness peculiar to cellulose-based fibers is also impaired, so the feel during use is deteriorated. In addition, when the mixing ratio of the cellulose-based fibers exceeds 80% by mass, the impregnated liquid is retained in the fiber, and a sufficient amount of liquid cannot be quickly released when necessary. In addition, since the bulkiness of the nonwoven fabric is impaired, the amount of liquid retained is reduced, and the feeling of grasping by a hand with a volume is also impaired. The preferable content rate of cellulose fiber is 40-60 mass%.

The polyester constituting the polyester fiber used in the present invention is a polymer polymer produced by condensation reaction of terephthalic acid with ethylene glycol or butylene glycol, and sebacic acid, adipic acid, trimellitic acid, isophthalic acid, and paraoxy Means a polyester polymer containing benzoic acid and the like, a condensation product of ethylene glycol or butylene glycol, and other polyesters.

The flat multi-leaf cross-section polyester fiber used in the present invention is a flat-shaped fiber having six or more convexities in cross-sectional shape.

The flat multi-leaf sectional polyester fiber used in the present invention is a flat polyester fiber having a cross-sectional shape of 6 or more convex portions. If there are less than six convex portions present in a circumferential columnar shape, there are fewer voids formed between adjacent fibers, and the amount of absorbency and the amount of retaining liquid becomes insufficient. In addition, when the cross-sectional shape is flat, it is possible to form voids between fibers, and excellent bulkiness can be obtained. In addition, a soft texture can be obtained in that the anti-wrinkle property of the short fibers constituting the nonwoven fabric is improved.

Fig. 1 shows an example of a single fiber cross-sectional shape of a flat multileaf cross-section polyester fiber used in the present invention. In Fig. 1, a cross-sectional shape of a multi-leaf flat cross-section polyester fiber provided by the nonwoven fabric of the present invention having a plurality (eight) convex portions on the circumference of the fiber cross-section is illustrated.

In the present invention, in the cross-sectional shape, a flat polyester fiber having 6 or more convex portions is used, but preferably 8 or more, more preferably 10 or more. In addition, the upper limit of the number of convexities is preferably 12. Moreover, it is preferable that the shape of the convex portion is a shape curved from the viewpoint of tactile property.

The flat multi-leaf cross-section polyester fiber used in the present invention is composed of polyester-based fibers in which the flat multi-leaf cross-sectional shape in the single fiber cross section satisfies the flatness of the following formula (1) and the mold release degree of the following formula (2) simultaneously. will be.

Flatness (A / B) = 2.0 to 3.0 ... (1)

Mold release rate (C / D) = 1.0 to 5.0 (2)

Here, A is the length of the longest line segment of the flat multi-lobed cross section. The B refers to the length of the line segment of the maximum width connecting between the vertices of the convex portion perpendicular to the length A of the line segment. The C is the largest unevenness formed by the flat multileaf type, and refers to the length of the line segment connecting between the vertices of the adjacent convex portions. In addition, D refers to the length of the water line falling from the line connecting the convex portions to the bottom of the concave portion.

That is, according to a preferred form of the nonwoven fabric of the present invention, the flat multi-leaf cross-section polyester-based fiber used for the blend surface connects the vertices of adjacent convex portions in the maximum length A of the cross section, the maximum width of B, and the maximum unevenness. When the length of the line is C, and the length of the water line falling from the line connecting the vertices of the convex portion to the bottom of the concave portion is D, the flatness of Equation (1) and the release degree of Equation (2) below are simultaneously satisfied. It is made of polyester fibers.

In the present invention, when the flatness (A / B) is less than 2.0, the creasability of the fibers deteriorates, so that a soft touch is not obtained. On the other hand, when the flatness (A / B) exceeds 3.0, the elasticity is small and it becomes easy to sit down. In addition, there is a tendency that the deterioration of yarn performance and the degree of mold release deteriorate. The flatness (A / B) is preferably 2.0 to 2.7, and more preferably 2.0 to 2.5.

Further, the release degree (C / D) indicates the size of the concave portion between the convex portion and the convex portion in the flat multi-leaf type, and if the value is large, the concave portion is small, and when the value is small, it means that the concave portion is large. When the mold release degree (C / D) is increased, the concave portion is shallow, and the pores formed between the fibers are also small, so that the water-absorbing property tends to decrease, and the dirt scratches tend to decrease. Therefore, the mold release degree (C / D) is 5.0 or less. On the other hand, if the degree of release (C / D) is too small, the concave portion of the fiber cross-section tends to bend and tend to be unable to maintain a flat shape. In addition, since it is susceptible to fiber damage due to abrasion, there is a fear that the skin is damaged when it is rubbed against the skin. In this respect, the mold release degree (C / D) is 1.0 or more. The mold release degree (C / D) ranges from 1.0 to 5.0 from the above point. In addition, the mold release degree (C / D) is more preferably 2.0 to 4.0 from the viewpoint of water absorption and wipeability.

The content ratio in the nonwoven fabric of the flat multi-leaf cross-section polyester fiber used in this invention is 20-80 mass%. When the mixing ratio (content) of the flat multi-leaf single-sided polyester fiber is less than 20% by mass, the volume of the non-woven fabric is lost, and the texture of the non-woven fabric is deteriorated. In addition, when the mixing ratio (content) of the flat multi-leaf single-sided polyester fiber exceeds 80% by weight, the bulkiness of the nonwoven fabric is improved, but there is a problem that the liquid flows out from the nonwoven fabric during use because the voids between the fibers become too large. The content ratio in the nonwoven fabric of the flat multi-leaf single-sided polyester fiber is preferably 40 to 60% by mass.

The flat multi-leaf cross-section polyester fiber used in the present invention has the maximum length (A) of the cross-section as the axis of symmetry, and the longest length except for the maximum cross-section width (B) of the line segments between the opposite convex vertices is E. When made, it is made of a polyester fiber that satisfies the convex ratio defined by the following formula (3).

Convex ratio (E / B) = 0.6 to 0.9 ... (3)

The convex ratio E / B has a meaning as an index for measuring the degree of deformation of an approximately elliptical shape obtained by drawing a line connecting the vertices of the maximum widths B and E and the maximum length A. If the convex ratio is too small, the depth of the concave portion decreases and the cross-sectional shape becomes an endlessly approximate flat cross shape. For this reason, the void ratio between fibers is lowered, and the water-absorbing property is reduced. In addition, when it comes into contact with the skin, it becomes closer to the flat cross shape, so the number of convex portions in contact is reduced, and the feel and softness are also reduced. Therefore, it is preferable that the convex ratio is 0.6 or more.

On the other hand, when the convex ratio is too large, when the irregularities between the fibers are fitted, the portion where the concave portion is completely occluded increases, and the porosity decreases, leading to a decrease in water absorption and maintenance. Moreover, when it comes into contact with the skin, the shape becomes a shape close to a flat hexagon, so that the number of convex portions to be contacted is reduced, and the feel and softness are reduced. In this respect, the convex ratio (E / B) is preferably 0.9 or less. The convex ratio (E / B) is preferably 0.6 to 0.9 from the above point. Moreover, the convex ratio (E / B) is preferably 0.6 to 0.8 from the viewpoint of the balance, and more preferably 0.7 to 0.8.

It is preferable that the monofilament fineness of the flat multi-leaf sectional polyester fiber used in the present invention is 2.0 dtex or less. The short fiber fineness is more preferably 1.0 to 2.0 dtex, still more preferably 1.2 to 1.8 dtex. When the short fiber fineness exceeds 2 dtex, the stiffness peculiar to polyester fiber becomes stronger, so the stimulus of the touch becomes strong and the soft texture may also be damaged. In addition, since the pores formed between the fibers become too large, the amount of the retaining liquid is high, but the retaining property is deteriorated, and the liquid tends to flow from the nonwoven fabric during use. In addition, when the fineness of the short fibers is thinner than 1.0 dtex, the process passability in the card process is deteriorated, and the productivity tends to decrease.

Moreover, it is preferable that the fiber length of the flat multi-leaf single-sided polyester fiber is 30 to 64 mm from the viewpoint of the fiber shedding of the nonwoven fabric. The fiber length is more preferably 35 to 51 mm.

In addition, the nonwoven fabric of the present invention may contain heat-sealed fibers as separate fibers. By incorporating the heat-sealed fibers in the nonwoven fabric, it is possible to improve the morphological stability, which is one of the important functions when used for cleaning operations by heat-sealing of the heat-sealed fibers. As the heat-sealed fiber, a heat-sealed fiber composed of a single component may be used, but if a composite type heat-sealed fiber such as a side-by-side type or a core-sheath type composed of two or more types of resin components including parts not fused by heat treatment is used, This is a more preferable form because the fiber strength is maintained by the non-fused portion.

The components constituting the heat-sealed fibers are 6 nylon and polyethylene, polypropylene and polyethylene, polypropylene and ethylene-vinyl acetate copolymers, polyester and polypropylene, polyester and polyethylene, 6 nylon and 66 nylon, and high density polyester. And low-density polyester. The preferred blend ratio of the heat-sealed fiber is 5 to 20% by mass relative to the mass of the nonwoven fabric.

Next, a method for manufacturing the nonwoven fabric of the present invention will be described.

The above-mentioned flat multi-leaf cross-section polyester-based fibers and cellulose-based fibers are fiber-webed with a card. The mixing ratio (mass ratio) of the flat multi-leaf single-sided polyester fiber and the cellulose fiber is as described above, the flat multi-leaf single-sided polyester fiber / cellulose fiber = 20/80 to 80/20, and preferably the flat multi-leaf single-sided poly Ester fiber / cellulose fiber = 30/70 to 70/30.

The fibrous web formed of the card is then sent to a span lace process by feed lattice, subjected to high pressure water flow congestion, and processed into a sheet. The nonwoven fabric after the spunlace processing is sent to a drying process by a conveyor, and when the heat-treated fibers are used, heat treatment is performed simultaneously with drying at a temperature at which only the heat-adhesive fibers are melted.

Since the nonwoven fabric obtained in this way has excellent water absorption and soft texture, it is optimal as a non-woven fabric for cleaning or cosmetic purposes for the purpose of the present invention.

That is, the sheet obtained from the nonwoven fabric thus produced is excellent as a non-woven fabric that uses skin for cosmetic or cleaning purposes in that it has excellent absorbency and high water retention properties such as water or chemicals, and also excellent bulkiness, flexibility, and touch. to be. When used for cosmetic purposes, the liquid retention properties of the cosmetic liquid are high, and can have a performance capable of being discharged if necessary. In cleaning, it has a high wiping property without damaging the skin, and since the wiped dirt is caught in the concave portion of the fiber surface, it is a nonwoven fabric capable of retaining dirt in the nonwoven fabric and preventing recontamination, and exhibits a high cleaning effect.

Specific examples of the end use include baby wipes, wipes, cleansing sheets and facial sheets.

Example

Next, the nonwoven fabric of the present invention will be described in detail by examples, but the present invention is not limited to the examples. Each physical property value in an Example was measured by the following method, and the average value of three measurements was taken.

<Test method for nonwoven fabric thickness>

The thickness of five nonwoven fabrics having a unit weight of 50 g / m 2 was measured with nonius.

[Test method of retention rate]

Measured according to the absorption rate of JIS L 1907 7.2 (2010 version). The mass (A) is measured by cutting a test piece of 10 cm × 10 cm from a nonwoven fabric having a unit weight of 50 g / m 2. The test piece was immersed in ion-exchanged water for 30 seconds. After that, the tip of the test piece is picked up with tweezers and taken out of the liquid, and the mass (B) after 1 minute is measured.

The retention rate (C) is calculated by the following equation.

Retention rate C (%) = (B-A) / A × 100.

<Test method for residual ratio (liquid retention)>

Measured according to the absorption rate of JIS L 1907 7.2 (2010 version). The mass (A) is measured by cutting a test piece of 10 cm × 10 cm from a nonwoven fabric having a unit weight of 50 g / m 2. The test piece was immersed in ion-exchanged water for 30 seconds. After that, the tip of the test piece is picked up with tweezers and taken out of the solution, and the mass (D) after 5 minutes is measured.

The residual ratio (E) is calculated by the following equation.

E (%) = (D-A) / A × 100.

<Wipe property>

Cut a test piece into 10cm × 10cm from a nonwoven fabric having a unit weight of 50g / m 2 and use it after folding it 4 times. The specimen is impregnated with water three times the mass. The performance was compared by applying and wiping lipstick on the arm of 5 subjects. The evaluation contents are as follows, and ○ was set as the pass.

○: Good polishing properties

△: Some lipstick remains

×: Almost no lipstick is wiped off.

<Feel>

Cut a test piece into 10cm × 10cm from a nonwoven fabric having a unit weight of 50g / m 2 and use it after folding it 4 times. The specimen is impregnated with water three times the mass. Five subjects' arms were wiped, and the touch was evaluated according to the following criteria, and ○ was passed.

○: Good feel

△: The skin after wiping has a slight discomfort.

×: The skin after washing is tingling.

<Feel (hand) held by hand>

Cut a test piece into 10cm × 10cm from a nonwoven fabric having a unit weight of 50g / m 2 and use it after folding it 4 times. The specimen is impregnated with water three times the mass. Five subjects were allowed to hold the test piece, tactile evaluation was performed according to the following criteria, and ○ was passed.

○: The texture is soft

△: The texture is slightly hard.

×: The texture is hard.

[Example 1]

A flat multileaf polyester fiber (single fiber fineness: 1.7 dtex, fiber length: 51 mm) having a flatness of 2.1, a release degree of 2.7, and a convex ratio of 0.8 and having eight convexities, 20% by mass and rayon fiber (single fiber fineness) : 1.7 dtex, fiber length: 51 mm) After uniformly blending 80% by mass, a card fiber web having a unit weight of 60 g / cm 2 was produced by a commercial method, the water pressure of the water jet was 50 kg / cm 2, and the speed was 1 m / min. Nozzle shape: 0.1 mmφ, 0.6 mm pitch, 834 holes, 500 mm width was produced by double-sided processing, and then dried at a temperature of 120 ° C. to obtain a nonwoven fabric having a unit weight of 50 g / m 2. Table 1 shows the fiber configuration of the nonwoven fabric and Table 2 shows the evaluation results.

[Example 2]

50% by mass of flat multileaf polyester fiber (single fiber fineness 1.7dtex, fiber length 51mm) and rayon fiber (single fiber fineness 1.7) with a flatness of 2.1, a release degree of 2.7, a convex ratio of 0.8, and a cross-sectional shape having 8 convexities dtex, fiber length 51 mm) After 50% by mass is uniformly mixed, a card fiber web having a unit weight of 60 g / cm 2 is produced by a commercial method, the water pressure of the water jet is 50 kg / cm 2, the speed is 1 m / min, the nozzle shape: After the sheet was produced by double-sided processing with 0.1 mmφ, 0.6 mm pitch, 834 holes and 500 mm width, it was further dried at a temperature of 120 ° C. to obtain a nonwoven fabric having a unit weight of 50 g / m 2. Table 1 shows the fiber configuration of the nonwoven fabric and Table 2 shows the evaluation results.

[Example 3]

A flat multileaf polyester fiber (single fiber fineness: 1.7 dtex, fiber length: 51 mm) having a flatness of 2.1, a release degree of 2.7, and a convex ratio of 0.8 and having eight convexities, 80% by mass and rayon fiber (single fiber fineness) : 1.7 dtex, fiber length: 51 mm) After uniformly blending 20% by mass, a card fiber web having a unit weight of 60 g / cm 2 was produced by a commercial method, water jet pressure of 50 kg / cm 2, speed of 1 m / min, nozzle shape: The sheet was produced by double-sided processing with 0.1 mmφ, 0.6 mm pitch, 834 holes, and 500 mm width, and then dried at a temperature of 120 ° C. to obtain a nonwoven fabric having a unit weight of 50 g / m 2. Table 1 shows the fiber configuration of the nonwoven fabric and Table 2 shows the evaluation results.

[Comparative Example 1]

A flat multileaf polyester fiber (single fiber fineness: 1.7 dtex, fiber length: 51 mm) having a flatness of 2.1, a release degree of 2.7, and a convex ratio of 0.8 and having eight convexities, 15% by mass and rayon fiber (single fiber fineness) : 1.7 dtex, fiber length: 51 mm) After uniformly blending 85% by mass, a card fiber web having a unit weight of 60 g / cm 2 was produced by a commercial method, the water jet pressure was 50 kg / cm 2, and the speed was 1 m / min. Nozzle shape: 0.1 mmφ, 0.6 mm pitch, 834 holes, 500 mm width produced a sheet by double-sided processing, and then dried at a temperature of 120 ° C. to obtain a nonwoven fabric having a unit weight of 50 g / m 2. Table 3 shows the fiber configuration of the nonwoven fabric and Table 4 shows the evaluation results.

[Comparative Example 2]

A flat multileaf polyester fiber (single fiber fineness: 1.7 dtex, fiber length: 51 mm) having a flatness of 2.1, a release degree of 2.7, and a convex ratio of 0.8 and having eight convexities, 85% by mass and rayon fiber (single fiber fineness) : 1.7 dtex, fiber length: 51 mm) After uniformly blending 15 mass%, a card fiber web having a unit weight of 60 g / cm 2 was produced by a commercial method, and the water jet pressure was 50 kg / cm 2, speed 1 m / min, nozzle Shape: 0.1 mmφ, 0.6 mm pitch, 834 holes, 500 mm wide, then produced a sheet by double-sided processing, and then dried at a temperature of 120 ° C. to obtain a nonwoven fabric having a unit weight of 50 g / m 2. Table 3 shows the fiber configuration of the nonwoven fabric and Table 4 shows the evaluation results.

[Comparative Example 3]

A rayon fiber (single fiber fineness: 1.7 dtex, fiber length: 51 mm) is 100% by mass, and a card fiber web having a unit weight of 60 g / cm 2 is produced by a commercial method, water jet pressure of 50 kg / cm 2, speed of 1 m / min, nozzle Shape: 0.1 mmφ, 0.6 mm pitch, 834 holes, 500 mm wide, then produced a sheet by double-sided processing, and then dried at a temperature of 120 ° C. to obtain a nonwoven fabric having a unit weight of 50 g / m 2. Table 3 shows the fiber configuration of the nonwoven fabric and Table 4 shows the evaluation results.

[Comparative Example 4]

80% by mass of a heterogeneous single-sided polyester fiber (single fiber fineness: 1.7 dtex, fiber length: 51 mm,) having a flatness of 1.0 and having six convex portions on the circumference of a cross-sectional shape and rayon fiber (single fiber fineness: 1.7 dtex, fiber length : 51mm) After uniformly blending 20% by mass, a card fiber web having a unit weight of 60g / cm2 was produced by a commercial method, and the water jet pressure was 50kg / cm2, the speed was 1m / min, the nozzle shape: 0.1mmφ, After the sheet was produced by double-sided processing with 0.6 mm pitch, 834 holes, and 500 mm width, it was further dried at a temperature of 120 ° C. to obtain a nonwoven fabric having a unit weight of 50 g / m 2. Table 3 shows the fiber configuration of the nonwoven fabric and Table 4 shows the evaluation results.

[Comparative Example 5]

Release cross-section (Y-type) polyester fiber (single fiber fineness: 1.7 dtex, fiber length: 51 mm) having three convex portions on the circumference of the cross-sectional shape 80% by mass and rayon fiber (single fiber fineness: 1.7 dtex, fiber length: 51mm) After uniformly blending 20% by mass, a card fiber web having a unit weight of 60g / cm2 was produced by a commercial method, the water jet pressure was 50kg / cm2, the speed was 1m / min, the nozzle shape: 0.1mmφ, 0.6 After the sheet was produced by double-sided processing with a mm pitch, 834 holes, and 500 mm width, it was further dried at a temperature of 120 ° C. to obtain a nonwoven fabric having a unit weight of 50 g / m 2. Table 3 shows the fiber configuration of the nonwoven fabric and Table 4 shows the evaluation results.

[Comparative Example 6]

Uniform mass of 80% by mass of a single-sided polyester fiber (short fiber fineness: 1.7dtex, fiber length: 51mm) and rayon fiber (single fiber fineness: 1.7dtex, fiber length: 51mm) having a C-shaped cross section After blending, a card fiber web having a unit weight of 60 g / cm 2 was produced by a commercial method, the water pressure of the water jet was 50 kg / cm 2, the speed was 1 m / min, the nozzle shape: 0.1 mmφ, 0.6 mm pitch, 834 holes, 500 mm width The sheet was prepared by double-sided processing, and then dried at a temperature of 120 ° C. to obtain a nonwoven fabric having a unit weight of 50 g / m 2. Table 3 shows the fiber configuration of the nonwoven fabric and Table 4 shows the evaluation results.

[Comparative Example 7]

After uniformly mixing 80% by mass of annular cross-section polyester fiber (single fiber fineness: 1.7dtex, fiber length: 51mm) and 20% by mass of rayon fiber (single fiber fineness: 1.7dtex, fiber length: 51mm), the unit weight is A card fiber web of 60 g / cm 2 is produced by the commercial method, and the water jet pressure is 50 kg / cm 2, the speed is 1 m / min, the nozzle shape: 0.1 mm φ, 0.6 mm pitch, 834 holes, 500 mm width, and the sheet is double-sided. After production, it was further dried at a temperature of 120 ° C. to obtain a nonwoven fabric having a unit weight of 50 g / m 2. Table 3 shows the fiber configuration of the nonwoven fabric and Table 4 shows the evaluation results.

As shown in Examples 1 to 3, the nonwoven fabric made of 20 to 80% by mass and 20 to 80% by mass of rayon flat cross-section polyester fiber having 8 convex portions on the circumference of the fiber cross section has high retention, so It has been confirmed that it is easy to retain liquids such as or chemicals, and it is possible to effectively use the liquid by releasing the retained chemicals from the viewpoint of having a low residual rate. In addition, the wipeability and the hand grip (feel) and the touch were also good.

On the other hand, as shown in Comparative Example 1, when the content of the cellulose-based fiber exceeds 80% by mass, the touch is good, but since the bulkiness of the nonwoven fabric is impaired, the liquid-retaining property is lowered and the cellulose-based fiber retains the chemical solution in the fiber. It has a high residual rate and causes a poor release of the chemicals.

In addition, as shown in Comparative Example 2, when the content ratio of the flat multi-leaf cross-section polyester exceeds 80% by mass, the softness of the cellulose-based fiber is impaired, and the touch is deteriorated.

On the other hand, as shown in Comparative Examples 3 to 7, when using a non-flat release cross-section polyester fiber, the liquid retaining property is increased, but the residual ratio is remarkably lowered. It causes liquid flow. Also, since it is not flat, the texture is also hard, and the touch is also significantly deteriorated.

Claims (4)

A nonwoven fabric comprising 20 to 80% by mass of multi-leaf flat cross-section polyester fibers and 20 to 80% by mass of cellulose fibers,
The cross-sectional shape of the multi-leaf flat cross-section polyester fiber is a flat shape having six or more convex portions on the circumference, and the maximum length of the cross-section of the multi-leaf flat cross-section polyester fiber is A, the maximum width is B, and the maximum irregularities are When the length of the line connecting the vertices of adjacent convexities is C, and the length of the water line falling from the line C connecting the vertices of the convex portion to the bottom of the concave portion is D, the flatness of equation (1) A nonwoven fabric characterized by satisfying the mold release degree of the following formula (2) at the same time.
Flatness (A / B) = 2.0 to 3.0 ... (1)
Mold release rate (C / D) = 2.0 to 5.0 (2) According to claim 1,
When the maximum length (A) of the cross section of the multi-leaf flat cross-section polyester fiber is set to be the symmetry axis, and the longest length is E, excluding the maximum cross-section width (B) of the line segments between the opposing convex portions, the following equation Non-woven fabric characterized in that it satisfies the convex booby defined by (3).
Convex ratio (E / B) = 0.6 to 0.9 ... (3) The method of claim 1 or 2,
Non-woven fabric, characterized in that the monofilament fineness of the multi-leaf flat cross-section polyester fiber is 2.0 dtex or less. A non-woven fabric for wipers, comprising the non-woven fabric according to claim 1 or 2.

Images