TWI609107B - Highly shrinkable acrylic fiber, acrylic fiber and yarn containing the same fiber and pile fabric having different pile heights using the same yarn - Google Patents

Description

High-shrinkage polyacrylonitrile fiber, polyacrylonitrile fiber and spinning fabric containing the same fiber and the same plush fabric using the same spinning

The present invention relates to a pile fabric of polyacrylonitrile fibers suitable for a pile fabric having different pile heights and a pile height obtained by using a yarn containing the same fibers.

In general, the natural fur contains a hairline which is tapered at the front end as compared with the root portion, and thus has a unique texture which is resilience and soft to the touch. In recent years, from the viewpoint of natural environmental protection, there is a tendency to control the use of natural fur, and it is strongly required to use synthetic fibers to develop a vertical hair product having a texture close to natural fur.

Among synthetic fibers, in particular, polyacrylonitrile fibers have a texture and luster of animal hair style, and are widely used as raw materials for animal hair style hair products.

Pillow products using polyacrylonitrile fibers and similar to natural fur have also been commercially available from the past, but fibers having a uniform thickness must be used, so The same thickness as the root portion has a resilience but a rough texture, and if it has the same thickness from the root portion to the tip end, it has a texture without resilience.

As a technique for obtaining a crepe product in which a synthetic fiber having a texture closer to that of natural fur is used, there is a pile fabric having a height different from that of a plush portion and a short pile portion. It is a structure in which the plush portion mimics the guard hair and the short plush imitates the down hair, and is suitable for obtaining a fabric having a animal hair style.

It requires hair treatment and softness to the plush part, and requires hairiness, voluminousness, and bulkiness for the short pile. It is particularly desirable to develop a polyacrylonitrile fiber which has excellent bulkiness and standability in the short pile portion, and the pile fabric as a whole can maintain a soft feeling.

As for the above-mentioned polyacrylonitrile fiber, the following polyacrylonitrile fiber is known, as described in Japanese Laid-Open Patent Publication No. Hei 8-260234 (Patent Document 1). As the fiber for a needle component, the polyacrylonitrile fiber is an ultra-flat polyacrylonitrile fiber having a convex portion continuous in the fiber axis direction on the long side thereof.

In the case of the above-mentioned pile fiber or the like, the pile fiber has a flatness ratio of 15 to 30 and a monofilament fiber fineness of 2, as disclosed in Japanese Laid-Open Patent Publication No. Hei 9-78375 (Patent Document 2). Danny ~ 3 Danny (2.2dtex ~ 3.3dtex) ultra-flat polyacrylonitrile fiber and 1 Danny ~ 5 Danny (1.1dtex ~ 5.6dtex) shrinkable polyacrylonitrile fiber and other polyacrylonitrile fibers.

In Yuli wool products, the important characteristic is that there is no sinking of the hairline, hair Rationality and good standing. In order to improve the feel of the vertical hair product, the needle component is improved to a flat cross-section fiber, a canine bone cross-section fiber, a broad bean cross-section fiber, a circular cross-section fiber, and the like. , are all poor results.

Further, for example, Japanese Laid-Open Patent Publication No. Hei 11-350298 (Patent Document 3) discloses an example in which a fluff component is mainly used as a circular cross-sectional shrinkage fiber, and a part of a flat fiber is used.

However, shrink fibers for other cross-sectional shapes are not mentioned.

[Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 8-260234

[Patent Document 2] Japanese Patent Laid-Open No. Hei 9-78375

[Patent Document 3] Japanese Patent Laid-Open No. Hei 11-350298

In an effort to study the above, it has been found that the present invention can be attained by using a fiber having a different cross section and a high shrinkage fiber as a fiber of a fluff component.

Polyacrylonitrile fiber yarn of the present invention is a single fiber fineness of 1dtex ~ 7dtex, shrinkage of 20% to 40%, the bulkiness after shrinkage of ^{0.19 × 10 1 mm 3 /g~0.30×10 1} mm 3 / g High shrinkage polyacrylonitrile fiber.

Further, the polyacrylonitrile fiber of the present invention preferably has a monofilament fiber fineness of 2 dtex to 7 dtex, an elongation of 50% to 70%, and a bulkiness of 0.19 × 10 ¹ mm ^{3 /} g to 0.30 × 10 ¹ mm ^{3 .} /g.

The polyacrylonitrile fiber of the present invention which defines the elongation and the bulkiness is preferably such that the minimum value of the second moment of the section per unit fineness in the direction in which the second moment of the section is the smallest is 600 μm ⁴ or more, and the second moment of the section becomes The maximum value of the second moment of the section per unit fineness in the largest direction is 2200 μm ⁴ or more.

More preferably, the minimum value of the second moment of the section in which the second moment of the section is the smallest is 4000 μm ⁴ or more.

Further, it is preferable that the polyacrylonitrile fiber of the present invention is a polyacrylonitrile fiber satisfying any of the following requirements A, B, and C.

A. The fiber cross-section is a rectangular cross-shaped circular shape having a short side shorter than the circular diameter, and the two end portions of the rectangular shape are located outside the circular shape, and the length of the long side of the rectangular shape is set to a, which will be short. When the length of the side is b, a/b is 3 to 25, and the diameter of the circle is set to W, and the small height of each of the maximum heights from the long sides of the rectangle in the circle is set to In the case of H, W is a/10 to 4a/5, and H is b/2 to 2b.

Hereinafter, in the present specification, the shape of the fiber cross section may be referred to as a "UFO type cross section".

B. The fiber cross-section has a triangular shape, and when the length of the largest side among the sides of the triangle is C and the height when the largest side is the base is B, B/C is 0.5 or more.

C. The shape of the fiber cross section is a dumbbell type, and the necking degree (X/Y) is 1.1 to 2.5.

X is the maximum diameter length of the portion where the neck end diameter is large.

Y is the diameter length of the necked bottom portion.

It is preferable that the polyacrylonitrile fiber of the present invention contains an acrylonitrile-based polymer containing 50% by mass or more of an acrylonitrile unit.

The spun yarn of the present invention is a spun yarn containing 20% by mass to 50% by mass of the polyacrylonitrile fiber of the present invention.

The plush fabric of different heights and lowers of the present invention is a pile fabric comprising a plush height of a plush portion and a short pile portion, and the short pile portion comprises the polyacrylonitrile fiber of the present invention, and the compression recovery property is 35~90.

It is preferable that the ratio of the polyacrylonitrile fibers contained in the short pile portion of the pile fabric having different pile heights of the present invention is 20% by mass to 50% by mass based on the entire pile portion.

It is preferable that the root of the pile of the pile fabric having different pile heights of the present invention is in a state of being spun.

It is preferable that the short pile portion of the pile fabric having different pile heights of the present invention has a length of 3 mm to 20 mm.

It is preferable that the plush portion of the pile fabric having different pile heights of the present invention has a pile length of 5 mm to 40 mm.

The raw materials used in the plush portion of the pile fabric having different pile heights of the present invention are synthetic fibers, natural fibers, and the like, and are not particularly limited, and may be appropriately selected depending on the desired texture.

Among them, preferred are polyacrylonitrile fibers, polyester fibers, and animal hair fibers. Any one or more. When the polyacrylonitrile fiber is subjected to heat treatment during the finishing of the pile, the crimping tends to be extended by heat, and therefore it is preferable to obtain a soft texture and an excellent color appearance.

Polyester fibers have resilience and are therefore preferred in fabrics that exhibit a hard texture.

If the animal hair fiber is used in the plush, it is preferable to obtain a texture and an appearance similar to the natural material.

Moreover, it is preferable that the content of any one or more of the polyacrylonitrile fiber, the polyester fiber, and the animal hair fiber of the pile fabric having different pile heights of the present invention is 50% by mass based on the entire pile portion. ~100% by mass.

When the content is 50% by mass or more, the characteristics of the raw material are easily exhibited, and therefore it is preferably 80% by mass or more.

Preferably, the lint fiber of the plush portion of the pile fabric having different heights of the present invention has a fineness of 1 dtex to 50 dtex.

When the fineness of the monofilament fiber is 1 dtex or more, a soft texture is easily obtained, and when the fineness of the monofilament fiber is 50 dtex or less, it is easy to obtain a pile having different pile heights.

Among them, from the viewpoint of the ease of curling and stretching due to the heat in the polishing step, it is more preferably 2dtex to 25dtex, and still more preferably 3dtex to 10dtex.

The cross-sectional shape of the polyacrylonitrile fiber or the polyester fiber used in the long pile portion of the pile fabric having different pile heights of the present invention is a flat section, a Y-shaped section, a UFO section, and a dumbbell. Section, round section, etc. It can be suitably selected according to the desired texture.

Among them, in the case where the cross-sectional shape is a flat cross section, a Y-shaped cross section, a UFO-shaped cross section, and a dumbbell-shaped cross section, it is preferable to obtain a texture close to the animal hair.

It is preferable that the difference between the length of the long pile portion of the pile fabric having different pile heights and the length of the short pile portion of the present invention is 1 mm to 20 mm. When the thickness is 1 mm or more, the characteristics of the plush portion can be easily exhibited. When the thickness is 20 mm or less, it is easy to obtain a pile fabric having different pile strength and high compression recovery.

From the viewpoint of the above, the difference between the length of the plush portion and the length of the short pile portion is preferably 3 mm to 15 mm, and more preferably 5 mm to 10 mm.

The present invention can obtain a plush fabric having different pile heights and excellent compressive recovery properties when the pile fabrics having different pile heights are made, and a suitable polyacrylonitrile for obtaining the piles having different pile heights. fiber.

1‧‧‧ fixture

10‧‧‧Clamp body

11‧‧‧1st plate

12‧‧‧2nd plate

13‧‧‧3rd plate

14‧‧‧ Plumb

A‧‧‧polyacrylonitrile fiber bundle

A‧‧‧length of the long side

B‧‧‧ Height with the largest side as the base

b‧‧‧The length of the short side

C‧‧‧The length of the largest side

H‧‧‧ Height

W‧‧‧Diameter diameter

X‧‧‧Maximum diameter length of the large diameter of the neck end

Y‧‧‧ Diameter length of the bottom of the neck

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view of a fiber axis perpendicular to the high shrinkage polyacrylonitrile fiber (A) of the present invention.

Figure 2 is a cross-sectional view of the fiber axis of the high shrinkage polyacrylonitrile fiber (B) perpendicular to the present invention.

Figure 3 is a cross-sectional view of the fiber axis of the high shrinkage polyacrylonitrile fiber (C) perpendicular to the present invention.

Figure 4 is a view showing the use of the polyacrylonitrile fiber bundle of the present invention as seen from obliquely above. A perspective view of a state in which the jig is measured and measured.

Hereinafter, the present invention will be described in more detail.

<Acrylonitrile-based polymer>

In the present invention, the acrylonitrile-based polymer contains acrylonitrile and an unsaturated monomer polymerizable therewith. Examples of such an unsaturated monomer include acrylic acid, methacrylic acid, or alkyl esters thereof, vinyl acetate, acrylamide, vinyl chloride, and vinylidene chloride, and vinylsulfonate can be further used depending on the purpose. An acidic unsaturated monomer such as sodium, sodium methallylsulfonate, sodium allylsulfonate, sodium acrylamide methylpropanesulfonate or sodium p-sulfophenylmethylallyl ether.

The content of the acrylonitrile unit in the polymer is preferably 50% by mass or more, more preferably 85% by mass or more, still more preferably 90% by mass or more, and the upper limit is preferably 99% by mass or less.

When the content of the acrylonitrile unit in the polymer is 80% by mass or more, the fiber strength which is not problematic in use is easily obtained, and when it is 99% by mass or less, good dyeability is easily obtained.

The acrylonitrile-based polymer constituting the polyacrylonitrile fiber of the present invention may contain one type of polymer, or may contain a mixture of two or more types of polymers having different acrylonitrile contents.

The polymerization method of the acrylonitrile-based polymer may be selected from suspension polymerization, solution polymerization, and the like, and is not particularly limited. The molecular weight of the acrylonitrile-based polymer is not particularly limited as long as it is a molecular weight in the range used in the production of a polyacrylonitrile fiber, and is self-spinning when it is made into a 0.5% by weight solution of dimethylformamide. Sex, fiber strength In view of the above, it is preferred that the reduced viscosity at 25 ° C is in the range of 1.5 to 3.0.

<spinning liquid>

The spinning dope can be prepared by dissolving the acrylonitrile-based polymer in a solvent so as to be 15% by mass to 28% by mass. When the concentration is 15% by mass or more, the shape and the shape of the ejection orifice of the spinning nozzle during solidification are obtained. The difference in the shape of the cross section is small, and it becomes easy to obtain the cross-sectional shape of the target. On the other hand, when it is 28 mass% or less, the spinning dope has good stability with time, and the spinning property is likely to be stabilized, which is preferable.

As the solvent, in addition to an organic solvent such as dimethylformamide, dimethylacetamide or dimethylhydrazine, a nitric acid, a thiocyanate aqueous solution, an aqueous zinc chloride solution or the like can be used, and it is intended to be spun by spinning. In the case where the discharge hole of the nozzle controls the cross-sectional shape, an organic solvent can be advantageously used. Among them, dimethyl acetamide is more preferable from the viewpoint of the speed of solidification and handling.

<spinning>

Spinning extraction is performed so that the spinning draw ratio defined by the ratio of the extraction speed of the coagulated yarn to the ejection linear velocity of the spinning dope is in the range of 0.7 to 2.0, whereby the spinning nozzle can be easily obtained. The shape of the ejector hole is approximately similar to the cross-sectional morphology of the polyacrylonitrile fiber. When the spinning draw ratio is 0.7 or more, the difference between the shape of the discharge hole of the spinning nozzle and the shape of the fiber cross section at the time of solidification is small, and it is preferable to easily obtain the target cross-sectional shape. On the other hand, when it is 2.0 or less, the number of breakage in the coagulation bath is small, which is preferable.

The obtained coagulated filament is stretched, washed, and dried by a known method and conditions. In the vapor extending step after the relaxation treatment step, the fiber is stretched at a magnification of 1.10 to 2.00, whereby the polyacrylonitrile fiber of the present invention having a shrinkage ratio of 20% to 40% is obtained.

The obtained fiber can be cut into a predetermined length according to the use and used as raw cotton.

The obtained raw cotton can be processed into a pile fabric by a known plush processing method.

The polyacrylonitrile fiber of the present invention is a polyacrylonitrile fiber which shrinks when heated by wet heat or dry heat.

First, the polyacrylonitrile fiber before shrinkage will be described.

<monofilament fiber fineness>

One of the main purposes of the polyacrylonitrile fiber is to be included in the short pile portion of the plush fabric having different pile heights. In order to obtain the soft texture of the plush fabric of different pile heights, it is preferred to shrink before the shrinkage. The monofilament fiber has a fineness of 1 dtex to 7 dtex.

When the fineness of the monofilament fiber is 1 dtex or more, it is easy to obtain excellent standability when the pile fabric having different pile heights is formed, and if it is 7 dtex or less, it is made into a pile fabric having different pile heights. It is easy to become a soft texture. From the viewpoint of the above, the fineness of the monofilament fiber is preferably 1 dtex to 5 dtex, and further preferably 2 dtex to 4 dtex.

<Shrinkage of polyacrylonitrile fiber>

The shrinkage ratio of the polyacrylonitrile fiber in the present invention may be 20% to 40% in any case of wet heat shrinkage rate (in boiling water × 3 minutes treatment) or dry heat shrinkage ratio (130 ° C × 10 minutes treatment).

If the shrinkage ratio is 20% or more, the shrinkage performance is sufficient, and the pile height can be sufficiently obtained. The plush feel of the different plush fabrics and the design effect. Further, if the shrinkage ratio is 40% or less, the texture of the pile fabric having different pile heights does not become hard and the product quality can be ensured.

From the above viewpoints, the shrinkage ratio is more preferably 25% to 35%, and even more preferably 27% to 33%.

<Puffiness after shrinkage>

Bulkiness after shrinking polyacrylonitrile fiber of the present invention is ^{0.19 × 10 1 mm 3 /g~0.30×10 1} mm 3 / g.

When the bulkiness is 0.19 × 10 ¹ mm ³ /g or more, it is easy to be a plush fabric having different pile heights and excellent fullness, and if it is 0.30 × 10 ¹ mm ³ /g or less, the pile is piled. The texture of the different plush fabrics is not hard and ensures the quality of the products. From the viewpoint of the bulkiness it is more preferably ^{0.21 × 10 1 mm 3 /g~0.25×10 1} mm 3 / g.

Next, the polyacrylonitrile fiber of the present invention after shrinkage will be described.

<monofilament fiber fineness>

One of the main purposes of the polyacrylonitrile fiber is to be included in the short plush portion of the plush fabric having different pile heights. In order to obtain a soft texture of the plush fabric of different pile heights, it is preferred to be contracted. The fineness of the monofilament fiber is 2dtex~7dtex.

When the fineness of the monofilament fiber is 2 dtex or more, the compression recovery property tends to be good when used in a pile portion having a different pile height, and if it is 7 dtex or less, the texture is not too hard. Therefore, it is preferred.

From the viewpoint of the above, the fineness of the monofilament fiber is preferably 2dtex to 5dtex, and further preferably 2dtex to 4dtex.

<elongation rate>

The elongation of the polyacrylonitrile fiber is 50% to 70%. When the elongation is 50% or more, it is easy to form a pile fabric having different pile heights, which is preferable, and if it is 70% or less, the density of the pile fabric having different pile heights is not excessive. It is preferred to become taller and harder in texture.

From the above viewpoints, the elongation is more preferably from 52% to 65%, still more preferably from 56% to 63%.

<section second moment>

The second moment of the section is an amount indicating the degree of difficulty in deformation of the object with respect to the bending moment. If the value of the second moment of the section is high, it is difficult to bend, and if it is low, it is easy to bend.

Moreover, in the case of a profiled cross section, the value of the second moment of the section changes depending on the direction of the bend.

It is preferable that the minimum value of the second moment of the section per unit fineness in the direction in which the second moment of the cross section of the polyacrylonitrile fiber of the present invention is the smallest is 600 μm ⁴ or more, and the unit of the second moment of the section becomes the largest in the direction. The maximum value of the second moment of the section is 2200 μm ⁴ or more.

When the minimum value of the second moment of the section per unit fineness in the direction in which the second moment of the section becomes the smallest is 600 μm ⁴ or more, even if it is used in the short pile portion of the pile fabric having different pile heights, even if it is used External forces, it is difficult for the hair to fall, even in the case of falling due to external forces, it becomes easy to recover. From the viewpoint, the minimum value is more preferably more than 1000μm ^4, is further more preferably more than 4000μm ^4.

When the maximum value of the second moment of the section per unit fineness in the direction in which the second moment of the section becomes the largest is 2,200 μm ⁴ or more, even if it is used in the short pile portion of the pile fabric having different pile heights, even if it is applied External forces, it is difficult to fall down, and even in the case of falling, the hair is easy to recover. From the above viewpoints, the maximum value is more preferably 6000 μm ⁴ or more, still more preferably 10000 μm ⁴ or more.

In the case of making the piles having different pile heights, the orientation of the fiber cross-section of many of the pile fibers present in the pile fabric is not fixed, so the second moment of the section becomes the largest direction of the section per unit of fineness. As the maximum value of the secondary moment becomes higher, even if an external force is applied in a certain direction, the standing hair becomes more difficult to fall.

When the minimum value of the second moment of the section in which the second moment of the section is the smallest is 4000 μm ⁴ or more, when it is used in the short pile portion of the pile fabric having different pile heights, even if an external force is applied, it is difficult to pry the hair. Next, it is better.

<Sectional shape of polyacrylonitrile fiber>

The cross-sectional shape of the polyacrylonitrile fiber of the present invention is not particularly limited, and specific examples are shown below.

The necessary conditions are as follows.

The fiber cross-section is a rectangular-shaped circular shape having a short side shorter than the diameter of the circular shape, and the two end portions of the rectangular shape are located outside the circular shape, and the length of the long side of the rectangular shape is set to a, and the short side is When the length is set to b, a/b is 3~25, and the circle is When the diameter of the shape is W and the small height of each of the maximum heights from the long sides of the rectangle in the circle is H, W is required to be a/10 to 4a/5, and H is b/2 to 2b. . Further, the term "fiber cross section" as used in the present invention means a fiber cross section perpendicular to the longitudinal direction of the fiber.

When the polyacrylonitrile fiber is shrunk by satisfying the necessary condition A, excellent resilience and standability due to the cross-sectional shape can be obtained.

The necessary condition B is as follows.

The fiber cross-section has a triangular shape, and when the length of the largest side among the sides of the triangle is C and the height when the largest side is the base is B, B/C is required to be 0.5 or more. When B/C is less than 0.5, the shape is close to a flat shape and the elastic shape of the fiber cross section is impaired, and the desired effect is not obtained. Moreover, the highest value of B/C is 0.87 which becomes an equilateral triangle. In addition, the cross section may also be a slightly triangular shape with a slightly rounded corner.

The necessary conditions C are as follows.

The shape of the cross section of the monofilament fiber is a dumbbell type, and the necking degree (X/Y) of the value indicated by the maximum diameter length (X) of the portion having a large neck end diameter/the diameter length (Y) of the neck portion of the neck portion is required. It is 1.1~2.3. When the range of the necking degree is 1.1 or more, it becomes close to a normal flat cross section, and desired standability and resilience can be obtained. When the necking degree is 2.3 or less, the stability of spinning can be suppressed from being lowered, and the fiber strength can be lowered.

<spinning>

The polyacrylonitrile fiber of the present invention is short in forming a plush fabric having different heights of plush. The fibers of the pile portion can be processed into a spun yarn by blending at a predetermined ratio by a known method. The blending ratio of the polyacrylonitrile fibers of the present invention is preferably between 20% by mass and 50% by mass.

If it is 20% or more, the feeling of fullness of the plush fabric having different pile heights is not lowered; if it is 50% or less, the softness of the pile fabric having different pile heights can be maintained.

In addition to the flat polyacrylonitrile fiber, the non-shrinkable polyacrylonitrile fiber, and the shrinkable polyacrylonitrile fiber, the plush fabric having a different pile height may be added to the purpose of adding a soft touch. Fibers having a target function can be added for the purpose of imparting antibacterial properties and antistatic properties to the fibers of Danny and below, and the type of fibers to be added is not limited.

A method for producing a pile fabric having different pile heights can be produced by a known method such as a method of producing a pile fabric by spinning, a method of knitting a fiber bundle to produce a pile fabric, and the like.

In the case of using the high shrinkage polyacrylonitrile fiber of the present invention, a method of producing a pile after spinning is suitable. The reason for this is that the method is prone to the difference between the length of the short pile portion and the length of the long pile portion.

<Plush fabrics with different heights>

The plush fabric of different heights and lowers of the present invention is a pile fabric comprising a plush height of a plush portion and a short pile portion, and the short pile portion comprises the polyacrylonitrile fiber of the present invention, which is the compression recovery described below. The fleece fabric has a different plush height of 35~90.

By using the polyacrylonitrile fiber of the present invention due to the short pile portion, the hairiness can be obtained. Good plus, excellent compression recovery, plush height and different plush.

When the compression recovery property of the pile fabric having different pile heights of the present invention is 35 or more, even if the pile hair is temporarily fallen due to an external force, it is easy to recover. The maximum value of compression recovery is 90.

The compression recovery property is more preferably 38 or more, still more preferably 43 or more.

The pile fabric having different pile heights of the present invention preferably contains the polyacrylonitrile fiber of the present invention contained in the short pile portion of 20% by mass to 50% by mass based on the entire pile portion. . When the content of the polyacrylonitrile fiber of the present invention relative to the entire pile portion is 20% by mass or more, the standing pile of the long pile portion is good, and the desired resilience and standability can be obtained. When the content is 50% by mass or less, the pile portion is long. The mixing rate is not too small, and the texture of the fiber of the plush portion can be expressed to be close to the texture of the natural fur.

The content ratio is preferably from 30% by mass to 45% by mass, and from the viewpoint of the above, it is preferably from 35% by mass to 40% by mass.

It is preferable that the pile fabric having different pile heights of the present invention is in a state in which the root of the pile is spun. When the root portion of the pile is in a state of being spun, it is difficult for the fiber bundle to fall down from the root portion, and it is possible to form a pile fabric having a different pile height and different height.

In terms of the standability of the hair, it is preferred that the length of the spinning state is 1 mm to 5 mm.

Preferably, the plush fabric having different heights of the present invention has a length of 5 mm to 20 mm. If the length of the short pile is 5 mm or more, excellent hair standing property can be maintained; if it is 20 mm or less, the plush height is different. The texture of the fabric becomes soft.

More preferably, the short pile has a length of 5 mm to 10 mm.

It is preferable that the plush fabric having different pile heights of the present invention has a difference between the length of the plush portion and the length of the short pile portion of 1 mm to 20 mm. If it is this range, it can be set as the texture of a hairiness and a natural fur, and it is preferable.

In addition, in the plush fabric having different heights of the present invention, in order to maintain the toughness in the plush fabric having different pile heights, the resilience and the standing hairiness are exhibited, and the plush length of the plush portion is preferably 6 mm to 40 mm. . If the pile length of the long pile is 40 mm or less, the toughness and resilience of the polyacrylonitrile fiber can prevent the hair tip from being bundled.

[Examples]

Hereinafter, the present invention will be specifically described by way of examples. In addition, the measurement of each item in an Example is based on the following method.

<Monochrome fiber fineness measurement>

The measurement was carried out under the conditions of a temperature of 25 ° C and a humidity of 65% using an automatic vibrating fineness measuring instrument (manufactured by Search Control Electric Co., Ltd., and Denison Computer DC-11). The measurement was performed 25 times, and the average value was used.

<Measurement of shrinkage rate>

(1) The polyacrylonitrile fiber bundle was cut into about 2 m, and one end portion was fixed so as to hang vertically. Add a negative per unit of fineness of 10mg/dtex at the other end Loaded. Marks are marked at 2 points at intervals of 100 cm (L1).

(2) The polyacrylonitrile fiber bundle was placed in boiling water for 3 minutes without applying tension.

(3) The same load as (1) was applied to the bundle of polyacrylonitrile fibers, and the distance L2 (cm) of the two marks indicated in (1) was measured.

(4) The shrinkage ratio was calculated from the following formula.

Shrinkage ratio (%) = {(L1-L2) / L1} × 100

The number of tests was 3, and the average value was taken as the shrinkage rate.

<Puffiness measurement>

(1) Using the measuring jig 1 shown in Fig. 4, the bulkiness of the polyacrylonitrile fiber bundle was measured as follows. As shown in FIG. 4, the measuring jig 1 includes a jig main body 10 in which the first plate member 11 and the second plate member 12 are vertically spaced apart and vertically arranged in parallel, and the second plate member 13 is connected to the two pieces. The plate 11 and the lower end of the plate 12; the square column-shaped plumb bobs 14 are fitted in the gap between the first plate member 11 and the second plate member 12 of the jig body 10. According to the present embodiment, the interval between the first plate member 11 and the second plate member 12 is 10 mm, and the depth of the jig body 10 and the length of the plumb bobbin 14 are 40 mm.

In the measurement of the bulkiness of the polyacrylonitrile fiber bundle, n polyacrylonitrile fibers as a bundle of polyacrylonitrile fiber bundles A are arranged on the upper surface of the third plate member 13 to be laminated. Here, n is 500~800. Cutting off the portion exposed from the jig body 10 so that The ends of the fiber bundle are identical.

(2) The plumb 14 was placed on the upper side of the polyacrylonitrile fiber bundle and a load of 0.196 N was applied thereto, and the height H cm (H × 10 ¹ mm) after standing for 1 minute was measured, and the mass W of the fiber bundle A was measured ( g).

(3) The bulkiness was calculated by the following formula.

Fluffiness (mm ³ /g) = {10 × 40 × (H × 10 ¹ )} / (n × W)

The number of measurements was 10, and the average value was taken as the bulkiness (mm ³ /g).

<minimum value and maximum value per unit fineness of the second moment of the section>

The second moment of the section is calculated for each cross-sectional shape, and the minimum and maximum values of the second moment of the section are calculated by appropriately changing the X-axis direction and the Y-axis direction of the cross-sectional shape.

Next, the value obtained by dividing the minimum value and the maximum value of the second moment of the section by the fineness of the monofilament fiber is defined as the minimum value and the maximum value of the second moment of the section per unit fineness.

<Measurement of a, b, W, H, B, C, X, Y in the fiber cross section>

A fiber which was subjected to gold vapor deposition by an ion coater (manufactured by Eiko Engineering Co., Ltd., IB-3 type) at a magnification of 500 times using a scanning electron microscope (manufactured by Hitachi, Ltd., S-3500N) The cross section was observed, and the lengths of a, b, W, H, B, C, X, and Y of the fiber cross section were measured for 25 cross sections, and the average value was calculated.

<Compression recovery of different plush fabrics with different heights>

The compression recovery evaluation can be carried out by the following method.

The pile fabric having different pile heights was cut into 3 cm × 3 cm, and then allowed to stand in a dryer at 35 ° C for 3 days under a load of 141 g / cm ² . After standing for 3 days, the angle A of the standing hair immediately after the load was removed was measured. Further, the angle B of the standing hair at the same position after standing for one day at room temperature (25 ° C, 65% relative humidity) was measured. The so-called "angle" is an angle (an acute angle) between the horizontal plane of the base fabric and the direction in which the vertical hair is directed. The compression recovery of the pile hair of the plush fabric of different plush height is (BA).

The "compression recovery property" is the amount of change in the angle of the standing hair on the 1st day after the load is removed.

The number of measurements was 10 times, and the average was taken as the compression recovery property of the plush fabric having different pile heights.

<Texture evaluation of different plush fabrics with different heights>

A functional test using visual and finger contact was performed, and based on the following three viewpoints, evaluation was performed by three experienced researchers in the following four stages.

Evaluation items: wool handling, softness, fullness 5: The items of the plush fabric surface with different plush height are extremely good, 4: good, 3: normal, 2: bad, 1: extremely bad.

"Example 1"

A copolymer containing 90% by mass of acrylonitrile and 10% by mass of vinyl acetate was obtained by aqueous suspension polymerization. 0.5% by mass solution of the polymer in dimethylformamide, 25 ° C The reduced viscosity was 2.0. This polymer was dissolved in dimethylacetamide to prepare a spinning dope having a polymer concentration of 24% by mass. The spinning dope of the spinning nozzle having a cross-sectional shape as described in Table 1 was sprayed on an aqueous solution of dimethylacetamide having a temperature of 40 ° C and a solvent concentration of 40% to obtain a coagulated fiber. Further, the coagulated fiber is stretched in hot water at a stretching ratio of 5 times, washed, dried by a drying roll, thermally relaxed in a pressurized or water vapor atmosphere, and then extended in a vapor extending step. 2 times, further imparting mechanical crimping to obtain polyacrylonitrile fibers. The shrinkage ratio of the polyacrylonitrile fiber is shown in Table 1.

Further, a sample obtained by cutting a bundle of polyacrylonitrile fibers into about 2 m was placed in a container, and a vapor of 100 ° C was placed in the container for 3 minutes to shrink the polyacrylonitrile fibers. The shape and physical properties of the shrinkage polyacrylonitrile fiber are shown in Table 1 and Table 2.

Tables 1 and 2 show various physical properties other than the shape and shrinkage ratio of the polyacrylonitrile fiber after shrinkage.

The polypropylene fiber which is not shrinkage is variably cut in the range of the fiber length of 76 mm to 127 mm, and the polypropylene fiber is 40% by mass and the fiber cross-sectional shape is flat (flat ratio: 7). Nitrile fiber (part number: H155BRE3.3TVCL, monofilament fiber fineness 3.3dtex, fiber length 76mm~127mm variable cutting, shrinkage rate 0%, manufactured by Mitsubishi Rayon Co., Ltd.) 60% by mass ratio The carding of the conventional method is carried out to obtain a spinning having a hair count of 2/28 Nm. The spinning was subjected to fluff processing and skein dyeing. Thereafter, weaving and cutting are carried out, and then the brushing, polishing, and pleating of the known plush processing method are performed. The steps of (shearing) are processed to obtain a plush fabric having different pile heights. The evaluation results of the pile fabrics having different pile heights are shown in Table 3.

"Example 2 to Example 5, Comparative Example 1, Comparative Example 2"

The cross-sectional shape of the discharge hole of the spinning nozzle was changed, and the cross-sectional shape of the contracted polyacrylonitrile fiber was set as described in Table 1, and the same as in Example 1 was carried out, and the conditions shown in Table 1 and Table 2 were obtained. Polyacrylonitrile fiber.

In addition, the pile fabric having a different pile height was obtained in the same manner as in Example 1 except that the fibers of the pile were changed to the respective fibers.

The evaluation results of the plush fabrics having different pile heights are shown in Table 3.

"Comparative Example 3"

The polyacrylonitrile fibers described in Tables 1 and 2 were obtained in the same manner as in Example 1 except that the cross-sectional shape of the discharge holes of the spinning nozzle was changed without performing the vapor extension. The fiber length is cut to 38 mm.

The plush fabric having different pile heights is a polyacrylonitrile fiber having a polyacrylonitrile fiber of 40% by mass and a fiber cross-sectional shape of a flat shape (flatness ratio of 7) (part number: H155BRE3.3T51, monofilament fiber fine) A fiber bundle is produced by blending cotton with a degree of 3.3 dtex, a fiber length of 51 mm, a shrinkage of 0%, manufactured by Mitsubishi Rayon Co., Ltd., a pile fabric is produced by a fiber bundle knit, and a brushing process is performed. , polishing, and pleating (shearing) of each step of processing, obtaining the polyacrylonitrile fiber of Table 1 into a short plush part, part number: H155BRE3.3T51 becomes a plush fabric with different plush heights. The evaluation results of the pile fabrics having different pile heights are shown in Table 3.

"Comparative Examples 4 and 5"

The polyacrylonitrile fibers described in Tables 1 and 2 were obtained in the same manner as in Comparative Example 3 except that the cross-sectional shape of the discharge holes of the spinning nozzle was changed.

In the same manner as in Comparative Example 3 except that the polyacrylonitrile fibers obtained in Comparative Example 3 were changed to the polyacrylonitrile fibers obtained in Comparative Examples 4 and 5, a pile fabric having different pile heights was obtained.

The evaluation results of the pile fabrics having different pile heights are shown in Table 3.

Further, in the comparative examples, the following fibers were used.

Comparative Example 1: H156BHH3.3TVCL manufactured by Mitsubishi Rayon Co., Ltd.

Comparative Example 2: V57BSH3.3TVCL manufactured by Mitsubishi Rayon Co., Ltd.

Comparative Example 3: H155BRE3.3T38 manufactured by Mitsubishi Rayon Co., Ltd.

Comparative Example 4: V17BRE3.3T38 manufactured by Mitsubishi Rayon Co., Ltd.

Comparative Example 5: H180BRF3.3T38 manufactured by Mitsubishi Rayon Co., Ltd.

A‧‧‧length of the long side

b‧‧‧The length of the short side

H‧‧‧ Height

W‧‧‧Diameter diameter

Claims (14)

A highly shrinkable polyacrylonitrile fiber having a fineness of 1 dtex to 7 dtex, a shrinkage of 20% to 40%, and a bulkiness after shrinkage of 0.19 × 10 ¹ mm ^{3 /} g to 0.30 × 10 ¹ mm ³ /g, and the minimum value of the second moment of the section is a value in a direction in which the second moment of the section is minimized, and the value per unit fineness is 4000 μm ⁴ or more. Polyacrylonitrile fiber, monofilament fineness which is 2dtex ~ 7dtex, an elongation of 50% to 70%, the bulkiness of ^{0.19 × 10 1 mm 3 /g~0.30×10 1} mm 3 / g, and two cross-section The minimum value of the secondary moment is a value in a direction in which the second moment of the section is minimized, and the value per unit fineness is 4000 μm ⁴ or more. The polyacrylonitrile fiber according to claim 2, which satisfies the following requirements: A, the necessary condition B, and the requirement C: A. The fiber cross section has a rectangular shape running through a circle, wherein the rectangle has The short side is shorter than the diameter of the circle, and the two end portions of the rectangle are located outside the circle. When the length of the long side of the rectangle is a, and the length of the short side is b, a/b is 3. ~25, in the case of the circle, when the diameter of the circle is W and the small height of each of the maximum heights from the long sides of the rectangle is set to H, W is a/10~4a/5, H is b/2~2b; B. The fiber cross-section has a triangular shape, and the length of the largest side of the sides of the triangle is set to C, and the maximum side is used as the bottom side. When the height is set to B, B/C is 0.5 or more; C. The shape of the fiber cross section is dumbbell type, the necking degree (X/Y) is 1.1 to 2.5; X is the length of the largest diameter of the large diameter portion of the neck end; Y is the length of the diameter of the neck bottom. The polyacrylonitrile fiber according to claim 2, which comprises an acrylonitrile-based polymer containing 50% by mass or more of an acrylonitrile unit. A spinning comprising 20% by mass to 50% by mass of the high-shrinkage polyacrylonitrile fiber according to the first aspect of the patent application, and the polymerization according to any one of claims 2 to 4. Acrylonitrile fiber. A pile fabric having different pile heights, which is a pile fabric comprising a plush height of a plush portion and a short pile portion, the short pile portion comprising any of the second to fourth items of the patent application scope One of the polyacrylonitrile fibers has a compression recovery of 35 to 90. The plush fabric having different pile heights as described in claim 6, wherein the ratio of the polyacrylonitrile fibers contained in the short pile portion is 20 mass with respect to the entire pile portion. %~50% by mass. The plush fabric having different heights and lowers according to the sixth or seventh aspect of the patent application, wherein the root of the pile is in a spinning state. The plush fabric having different heights and lowers according to the sixth or seventh aspect of the patent application, wherein the short plush portion has a length of 3 mm to 20 mm. Such as the application of patent scope range 6 or 7 of the plush height of different hair a velvet fabric, wherein the plush portion has a length of 5 mm to 40 mm. The plush fabric having different plush heights according to the sixth or seventh aspect of the patent application, wherein the plush portion comprises one or more kinds of polyacrylonitrile fibers, polyester fibers, and animal hair fibers, and the content thereof is relative to The entire plush portion is 50% by mass to 100% by mass. The plush fabric having different plush heights according to the sixth or seventh aspect of the patent application, wherein the lint fiber has a fineness of 1 dtex to 50 dtex. The plush fabric having different heights and lowers according to the sixth or seventh aspect of the patent application, wherein the cross-sectional shape of the polyacrylonitrile fiber or the polyester fiber in the fiber axis direction is a flat cross section, a Y-shaped cross section, UFO type section, dumbbell type section. The plush fabric having different pile heights as described in claim 6 or 7, wherein the difference between the length of the plush portion and the length of the short pile portion is 1 mm to 20 mm.