JP2021139067A - Knitted fabric for student uniform and student uniform - Google Patents

Abstract

To provide a knitted fabric for a student uniform, which has tension and stiffness having wear resistance, water repellency and water absorption excellent in washing durability, and to provide a manufacturing method of the knitted fabric, and the student uniform using the knitted fabric on a face fabric.SOLUTION: A knitted fabric with loop density 35-120 course/2.54 cm, 35-70 wales/2.54 cm is obtained by knitting synthetic fiber multifilament A with a total fineness of more than 75 dtex and 220 dtex or less and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less at a mixing ratio of 25 to 98 wt.% and synthetic fiber multifilament B with a total fineness of 1/3 to 2/3 of the total fineness of the synthetic fiber multifilament A and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less at the mixing ratio of more than 10 wt.% and 75 wt.% or less. The synthetic fiber multifilament A exists on the outermost surface of the knitted fabric. An average height Rc of a contour curve element is 120 or more and 300 or less. The number of frictions is 30,000 or more. The knitted fabric for a student uniform, which is subjected to water repellent treatment or water absorption treatment, a manufacturing method of the knitted fabric and the student uniform using the method are provided.SELECTED DRAWING: Figure 1

Description

The present invention relates to a school uniform knitted fabric, a method for producing the same, and a school uniform using the knitted fabric as an outer material. More specifically, the present invention relates to a school uniform knitted fabric having abrasion durability, elasticity, excellent washing durability, water repellency, and water absorption, a method for producing the same, and a school uniform using the knitted fabric as an outer material.

Conventionally, the mainstream material for school uniforms has been woven fabrics that are elastic and have a good tailoring appearance. For example, the following Patent Document 1 proposes a woven fabric having a large basis weight and maintaining strength and excellent quick-drying property, but the woven fabric has a drawback that it has poor stretchability and is prone to wrinkles. On the other hand, in recent years, from the viewpoint of comfort and easy care, attention has been paid to knitted fabrics having excellent stretchability and less likely to wrinkle.

However, although the knitted fabric has excellent stretchability, it has drawbacks such as abrasion resistance due to rubbing and a snag phenomenon in which a loop is pulled out by being caught by a sharp object. In order to eliminate this drawback, for example, Patent Document 2 below proposes a knitted fabric for students that exhibits anti-snagging properties by using a twisted yarn as a part of the knitted fabric and adjusting the yarn length ratio to be knitted. There is. However, in the proposed woven fabric, there is a problem that the surface of the knitted fabric is limited to a smooth one in order to suppress snag, and the design is lacking. In addition, school clothes made of synthetic fibers are also required to have easy care properties that can be washed in a household washing machine. No suggestions have been made on how to make it.

Japanese Patent No. 5917800 Japanese Patent No. 6191667

In view of the above prior art, the problem to be solved by the present invention is to obtain a school uniform knitted fabric having elasticity, excellent washing durability, water repellency and water absorption while having abrasion durability, a manufacturing method thereof, and the knitted fabric. It is to provide the school uniform used for the outer material.

As a result of diligent studies and experiments to solve the above problems, the present inventors have knitted a loop of yarn having a certain thickness so as to be convex on the surface of the knitted fabric (front). , Weak threads are protected from external force to improve wear resistance, and water repellent and water absorbent remain in the recesses, which improves the washing durability of post-processing and also enables pattern expression. It was unexpectedly found that this was the case, and the present invention was completed.

That is, the present invention is as follows.
[1] Synthetic fiber multifilament A having a total fineness of more than 75 dtex and 220 dtex or less and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less has a mixing ratio of 25% by weight or more and less than 90% by weight, and the total fineness of the synthetic fiber multifilament A. Synthetic fiber multifilament B having a total fineness of 1/3 to 2/3 and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less was knitted at a mixing ratio of more than 10% by weight and 75% by weight or less, and a loop density of 35 to 120. It is a knitted fabric of course / 2.54 cm, 35-70 wales / 2.54 cm, and the synthetic fiber multifilament A is present on the outermost surface (front) of the knitted fabric. When the line roughness of the surface (Omotemen) of the knitted fabric is measured by a shot 3D shape measuring machine VR-3000 at a magnification of 12 times with a length of 10 mm in the horizontal direction, the average height Rc of the contour curve element is When the surface (front) of the knitted fabric is rubbed with a pressing load of 9.0 ± 0.2 kPa using a Martindale wear tester specified in JIS L 1096, which is 120 or more and 300 or less. The number of times of friction when the thread existing on the surface (front) breaks is 30,000 times or more, and the surface (front) is water-repellent, according to the JIS L 0217 103 method. A knitted fabric for students that has a water repellency of grade 3 or higher by the JIS L 1092 spray method after 30 times of washing.
[2] Synthetic fiber multifilament A having a total fineness of more than 75 dtex and 220 dtex or less and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less has a mixing ratio of 25% by weight or more and less than 90% by weight, and the total fineness of the synthetic fiber multifilament A. Synthetic fiber multifilament B having a total fineness of 1/3 to 2/3 and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less was knitted at a mixing ratio of more than 10% by weight and 75% by weight or less, and a loop density of 35 to 120. It is a knitted fabric of course / 2.54 cm, 35-70 wales / 2.54 cm, and the synthetic fiber multifilament A is present on the outermost surface (front) of the knitted fabric. When the line roughness of the surface (Omotemen) of the knitted fabric is measured by a shot 3D shape measuring machine VR-3000 at a magnification of 12 times with a length of 10 mm in the horizontal direction, the average height Rc of the contour curve element is When the surface (front) of the knitted fabric is rubbed with a pressing load of 9.0 ± 0.2 kPa using a Martindale wear tester specified in JIS L 1096, which is 120 or more and 300 or less. The number of times of friction when the thread existing on the surface (front) breaks is 30,000 times or more, and the surface (front) is water-absorbent, and conforms to the JIS L 0217 103 method. A knitted fabric for students, characterized in that the water absorption by the JIS L 1907 dropping method after 30 times of washing is 5 seconds or less.
[3] The knitted fabric for students according to the above [1] or [2], wherein the mixed ratio of the synthetic fiber multifilament D having a total fineness of 50 dtex or less is less than 2% by weight.
[4] The knitted fabric for students according to any one of [1] to [3] above, wherein both the synthetic fiber multifilament A and the synthetic fiber multifilament B are false-twisted polyester fibers.
[5] The above-mentioned [1] to [4], wherein the synthetic fiber multifilament A has a breaking strength of 3.5 cN / dtex or more and a breaking elongation of 20% or more and 50% or less. Student clothing knitted fabric.
[6] The knitted fabric is a warp knitted fabric, and the synthetic fiber multifilament A and the synthetic fiber multifilament B are both twisted yarns of 300 to 1200 T / m. The knitted fabric for student use listed in either.
[7] The knitted fabric is a circular knitted fabric, and a knit loop of the synthetic fiber multifilament A exists on the outermost surface (front side) of the knitted fabric, and the synthetic fiber multifilament A and the said The student-use knitted fabric according to any one of [1] to [5] above, wherein the synthetic fiber multifilament B is a twisted yarn of 1300 to 1900 T / m.
[8] The student dose according to any one of [1] to [7] above, further comprising fiber C selected from the group consisting of wool, nylon, acrylic, cotton, cupra, and rayon at a mixing ratio of 30% by weight or less. Knitted fabric.
[9] Any of the above [1] to [8], wherein the surface of the knitted fabric (Omotemen) has a snag property of grade 3 or higher after a 15-hour test in accordance with the JIS L 1058 D-3 method. Knitted fabric for student use described in Crab.
[10] The following steps:
Synthetic fiber multifilament A having a total fineness of more than 75 dtex and 220 dtex or less and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less after heat setting, and a total fineness of 1/3 to 2/3 of the total fineness of the synthetic fiber multifilament A. , A step of knitting a knitted fabric using a synthetic fiber multifilament B having a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less; and a step of heat-setting the obtained knitted fabric;
The method for producing a knitted fabric for student use according to any one of [1] to [9] above.
[11] A school uniform using the surface (front noodles) of the school uniform knitted fabric according to any one of [1] to [9] above as the outer material.

If the school uniform knitted fabric according to the present invention is used as the outer material, the knitted fabric has elasticity while improving the snag and abrasion resistance, which are the drawbacks of the knitted fabric, and the durability of water repellency or water absorption that is incidentally processed during the dyeing process is improved. You can get improved school uniforms.

It is an electron micrograph of the cross section of the surface (Omotemen) of the circular knitted fabric of Example 1. It is an electron micrograph of the cross section of the surface (Omotemen) of the circular knitted fabric obtained by the prior art. It is a knitting diagram of the circular knitted fabric of Examples 1 and 2 Comparative Examples 1 and 2. It is a knitting diagram of a circular knitted fabric example of the prior art. It is a knitting drawing of the warp knitted fabric (one example) of Example 3. It is explanatory drawing of the method of obtaining the average height Rc of a contour curve element.

Hereinafter, embodiments of the present invention will be described in detail.
In the knitted fabric for students of the present embodiment, the synthetic fiber multifilament A having a total fineness of more than 75 dtex and 220 dtex or less and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less is synthesized at a mixing ratio of 25% by weight or more and less than 90% by weight. Synthetic fiber multifilament B having a total fineness of 1/3 to 2/3 of the total fineness of the fiber multifilament A and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less is knitted at a mixing ratio of more than 10% by weight and 75% by weight or less. In addition, the knitted fabric has a loop density of 35 to 120 courses / 2.54 cm, 35 to 70 wales / 2.54 cm, and the synthetic fiber multifilament A is formed on the outermost surface (front) of the knitted fabric. When measuring the line roughness of the surface (Omotemen) of the knitted fabric with a magnification of 12 times using a one-shot 3D shape measuring machine VR-3000 manufactured by Keyence Co., Ltd. in the horizontal direction with a length of 10 mm, the contour curve The surface of the knitted fabric (Omotenmen) with an average height Rc of 120 or more and 300 or less and a pressing load of 9.0 ± 0.2 kPa using a Martindale wear tester specified in JIS L 1096. ) Is rubbed, the number of times of rubbing when the thread existing on the surface (front) breaks is 30,000 times or more, and the surface (front) is water-repellent. The water repellency by the JIS L 1092 spray method after 30 times of washing according to the JIS L 0217 103 method is 3rd grade or higher, or the surface (Omotemen) is water-absorbent and the JIS L 0217 103 method is applied. It is characterized in that the water absorption by the JIS L 1907 dropping method after 30 times of washing according to the above is 5 seconds or less.

[Synthetic fiber multifilament A]
The knitted fabric for students of the present embodiment has a synthetic fiber multifilament A having a total fineness of more than 75 dtex and 220 dtex or less and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less after heat setting (hereinafter, also referred to as abrasion resistant yarn). However, on the outermost surface (Omotemen) of the knitted fabric (Omotemen), the one-shot 3D shape measuring machine VR-3000 manufactured by Keyence Co., Ltd. was used to make the knitted fabric at a magnification of 12 times. When the line roughness of the surface (Omotemen) is measured in the horizontal direction by a length of 10 mm, the average height Rc of the contour curve element exists so as to be 120 or more and 300 or less. The total fineness of the synthetic fiber multifilament A after heat setting is preferably 84 dtex or more and 176 dtex or less, and the single yarn fineness of 1.5 dtex or more and 3.8 or less. When the total fineness exceeds 220 dtex and the single yarn fineness exceeds 5.0 dtex, the rigidity of the fiber becomes high, it is difficult to bend, and the texture of the knitted fabric becomes hard. When the total fineness is 75 dtex or less and the single yarn fineness is less than 1.5 dtex, the strength of the fiber is low, and the abrasion resistance and the snag resistance are lowered. The synthetic fiber multifilament A is preferably cross-knitted at a mixing ratio of 25% by weight or more and less than 90% by weight in order to form a sufficient convexity on the surface of the knitted fabric (front noodles). If the mixing ratio is less than 25% by weight, the loops that are convex on the surface of the knitted fabric are insufficient, and it becomes difficult to protect the weak yarn from abrasion. In order to make the mixing ratio 25% by weight or more, the knitted fabric should be knitted so that the synthetic fiber multifilament A occupies 50% or more of the surface area of the surface area (Omotemen) of the knitted fabric to be worn. good.

The synthetic fiber multifilament A is preferably one having high strength in terms of yarn physical characteristics, and preferably has a breaking strength of 3.5 cN / dtex or more and a breaking elongation of 20% or more and 50% or less. More preferably, the breaking strength is 4.0 cN / dtex or more, and even more preferably 4.2 cN / dtex or more. If the breaking strength is less than 3.5 cN / dtex, the wear resistance is not good. On the other hand, the larger the breaking strength, the more preferable the characteristic value for improving the wear resistance, but the fiber becomes harder at 6.0 cN / dtex or more. The elongation at break is more preferably 30% or more and 45% or less. If the breaking elongation is less than 20%, fibrillation is likely to occur and good wear resistance cannot be obtained. On the other hand, if the breaking elongation exceeds 50%, the breaking strength is 3.5 cN / dtex or more. Becomes difficult. As a method for producing the synthetic fiber multifilament A, for example, as described in Japanese Patent No. 5700708, after the stretching treatment, a relaxation heat treatment in a specific range is performed, and the physical properties of the fiber, particularly strength, elongation, stress- Examples of the strain curve in which the differential Young's modulus is defined in a specific range, for example, "ELMAX" (registered trademark) manufactured by Asahi Kasei Corporation.

[Synthetic fiber multifilament B]
Further, in the knitted fabric for students of the present embodiment, the loop made of the synthetic fiber multifilament A (wear-resistant yarn A) is said to be more convex on the surface of the knitted fabric (front) after heat setting. Synthetic fiber multifilament B having a total fineness of 1/3 to 2/3 of the total fineness of the abrasion resistant yarn A and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less has a mixing ratio of more than 10% by weight and 75% by weight or less. Exists like.
The single yarn fineness of the synthetic fiber multifilament B is preferably 1.5 dtex or more and 3.8 dtex or less. When the mixing ratio of the synthetic fiber multifilament B is 75% by weight or more, fine threads that are vulnerable to friction occupy a large amount of the surface (front noodles) of the knitted fabric, and the abrasion resistance of the knitted fabric is lowered. When the knitted fabric is cross-knitted, the feed length of the abrasion-resistant yarn A having a large total fineness can be lengthened to facilitate the swelling of the loop. This makes it possible to diversify the pattern expression while giving the knitted fabric abrasion resistance and anti-snag resistance.
The total fineness of the synthetic fiber multifilament may be in the above range, but it is preferably more than 50 dtex in order to secure the strength and abrasion resistance of the knitted fabric.

The knitting method of the student-use knitted fabric of the present invention is not particularly limited, and may be a warp knitted fabric or a horizontal knitted fabric. In horizontal knitted fabrics, especially circular knitted fabrics, as a method for forming the synthetic fiber multifilament A into a convex structure on the surface of the knitted fabric, the synthetic fiber multifilament A is made into a convex structure by the above-mentioned thread B, and the synthetic fiber multifilament A is formed into a convex structure. A method of alternately arranging loops made of synthetic fiber multifilament A and loops made of synthetic fiber multifilament B to form irregularities of the loop due to the difference in fineness is preferable, and the runner length of the synthetic fiber multifilament A having a large total fineness is more preferable. Can be adjusted by selecting appropriate conditions according to the knitting structure, such as making the synthetic fiber multifilament longer than the synthetic fiber multifilament B, or knitting the B thread from the back side into the A thread knitted on the front side of the product with a tuck structure to create a raised pattern. ..

Due to the combination of the difference in fineness, the weight mixing ratio to be interwoven, and the knitting structure, the synthetic fiber multifilament A is present on the outermost surface (front) of the knitted fabric for students of the present embodiment. , When measuring the line roughness of the surface (Omotemen) of the knitted fabric with a magnification of 12 times using a one-shot 3D shape measuring machine VR-3000 manufactured by Keyence Co., Ltd. in the horizontal direction with a length of 10 mm, the contour curve element The surface (front) of the knitted fabric has an average height Rc of 120 or more and 300 or less, and a pressing load of 9.0 ± 0.2 kPa using a Martindale wear tester specified in JIS L 1096. When rubbing, the number of times of friction when the thread existing on the surface (front) breaks is 30,000 times or more.
When the average height Rc of the contour curve element is 120 or more and 300 or less, it can be said that the loop of the abrasion resistant yarn is sufficiently exposed on the surface (front side) of the knitted fabric.

Hereinafter, with reference to FIG. 6, the average height Rc of the contour curve element of the knitted fabric surface (Omotemen) in which the composite processed yarn appears will be described below.
If the synthetic fiber multifilament A is used for the supply port 1 shown in the knitting structure diagram, the knit loop of the composite processed yarn appears on the surface of the knitted fabric (Omotemen) after the knitted fabric is produced. The "bottom surface of the knitted fabric" is the bottom of the space existing between the knit loops, and the "top of the knitted fabric" means the apex of the knit loop. As shown in the measurement curve, the contour curve element is the sum of the depth of the bottom surface of one (wave) knitted fabric and the height of the apex of the knitted fabric in the line roughness measurement length (10 mm). The average height Rc of the contour curve element is the average value (of all waves) of the contour curve element. That is, if unevenness appears on the surface of the knitted fabric, the Rc value becomes high. In the student-use knitted fabric of the present embodiment, the Rc value needs to be 120 or more and 300 or less, preferably 130 or more and 250 or less. When unevenness is formed on the surface, the convex portion where the strong synthetic fiber multifilament A is present exhibits abrasion resistance, and the processing agent added by the post-dyeing process is protected from abrasion in the concave portion to improve durability. Can be demonstrated. When the Rc value is less than 120, the surface of the knitted fabric tends to be smooth, and the abrasion resistance and the anti-snagging property are good. It ends up. On the other hand, if the Rc value exceeds 300, the unevenness is too high and it is easy to get caught in a sharp object, which causes deterioration of snugging.

Both the synthetic fiber multifilament A and the synthetic fiber multifilament B can be false-twisted polyester fibers.

In the student-use knitted fabric of the present embodiment, the unevenness can be emphasized by further mixing the synthetic fiber multifilament D having a total fineness of 20 dtex or more and 50 dtex or less and a boiling water shrinkage rate of 10% or more after heat setting. However, by further mixing special fibers, management of durability, dyeability, etc. becomes complicated, and from the viewpoint of cost, in the present invention, synthetic fiber multifilaments having a total fineness of 50 dtex or less may not be mixed. Even if they are mixed, the mixing ratio is preferably less than 2% by weight.

The loop density of the student-use knitted fabric of the present embodiment is 35 to 120 courses / 2.54 cm, 35 to 70 wales / 2.54 cm, preferably 40 to 100 courses / inch (2.54 cm), 40 to 65. Wale / inch (2.54 cm). If the loop density is less than 35 courses and 35 wales / inch, the loop spacing of the abrasion resistant yarns A, which are convex on the knitted ground, is separated, which causes the weak yarns to be exposed to the surface and worn. On the other hand, if it exceeds 120 courses / inch or 70 wales / inch, the loop density is too high, the air permeability and stretchability are lowered, and the comfort is adversely affected.

Similarly, in the warp knitted fabric, the warp number of the synthetic fiber multifilaments A and B and the arrangement through which the synthetic fibers are passed through the guide may be adjusted according to the design structure to obtain a predetermined weight mixing ratio. When the student-use knitted fabric of the present embodiment is knitted by a warp knitting machine, it is preferable to treat the needle surface as the front side of the product from the viewpoint of maintaining the physical characteristics of the fabric such as snags and pillings. In order to form the unevenness, it is preferable to knit the A thread into the back reed and the B thread into the front reed or the middle reed. A method of cross-knitting to make a striped pattern can be mentioned, and a surface condition similar to that of the above-mentioned circular knitted fabric can be achieved by this method.

As described above, both the synthetic fiber multifilaments A and B are made of polyester and can be false-twisted. The polyester may be synthesized by any method. For example, in the case of polyester, terephthalic acid and ethylene glycol are directly subjected to a transesterification reaction, terephthalic acid such as dimethyl terephthalate and ethylene glycol are transesterified, or a lower alkyl esthetic of terephthalic acid such as dimethyl terephthalate is used. A first-step reaction to produce a glycol ester of terephthalic acid and / or a low polymer thereof by transesterifying el and ethylene glycol or reacting terephthalic acid with ethylene oxide, and a first step. It can be produced by a second step reaction in which the reaction product of the step is heated under reduced pressure and transesterified to a desired degree of polymerization. The cross-sectional shape of the single yarn is not particularly limited and may be a normal round cross-sectional shape or a modified cross-sectional shape. Specific examples of the irregular cross-sectional shape include a triangular shape, a square shape, a cross shape, a flat shape, a W type, an I type, and a flat type with a constriction.

The polyester fiber may contain a matting agent (titanium oxide compound), an ultraviolet absorber, a micropore forming agent (organic sulfonic acid metal salt), a color inhibitor, a heat stabilizer, and a flame retardant (antimony trioxide), if necessary. , Fluorescent whitening agent, coloring pigment, antistatic agent (metal sulfonic acid salt), hygroscopic agent (polyoxyalkylene glycol), one or more kinds of inorganic particles such as antibacterial agent are contained in 0.1% by weight or more. May be good.

The knitted fabric for students of the present embodiment is a circular knitted fabric, and the knit loop of the synthetic fiber multifilament A is present on the outermost surface (front side) of the knitted fabric, and the synthetic fiber multifilament is present. And the synthetic fiber multifilament B can both be twisted yarns of 1300 to 1900 T / m.
The synthetic fiber has a peculiar luster, and when it is made into a knitted fabric, it causes the surface to glaring and looks cheap. By twisting the synthetic fiber, it is possible to give the knitted fabric a firmness while eliminating the glare, and to give a wool-like crispness that is preferable for school uniforms.
When the knitted fabric for students of the present embodiment is a circular knitted fabric, the number of twists of the synthetic fiber multifilaments A and B is preferably 1300 to 1900 T / m. If it exceeds 1900 T / m, the torque is too strong and the knitting property deteriorates. On the other hand, if it is less than 1300 T / m, the shine of the synthetic fiber disappears and the feeling of crispness is insufficiently provided.

Further, the knitted fabric for students of the present embodiment is a warp knitted fabric, and the synthetic fiber multifilament A and the synthetic fiber multifilament B can both be twisted yarns of 300 to 1200 T / m.
In the warp knitted fabric, the torque of the warp knitted fabric has a greater influence on the knitting property than that of the circular knitting. Therefore, the number of twists of the synthetic fibers multifilaments A and B is preferably 300 to 1200 T / m.

[Fiber C]
The student-use knitted fabric of the present embodiment can further contain fiber C selected from the group consisting of wool, nylon, cotton, acrylic, cupra, and rayon in a mixing ratio of 30% by weight or less.
The knitted fabric for students of the present embodiment may be a knitted fabric made of only polyester fibers, but may be interwoven with other fibers, and is not limited to, for example, nylon, acrylic, cupra, rayon, etc. You may mix and knit with the fibers of. When interlacing low-strength fibers such as cupra and rayon as other fibers, it is preferable to knit them into a structure that is not exposed on the surface (front noodles) side of the knitted fabric at a mixing ratio of 30% by weight or less.
From the viewpoint of abrasion resistance, the synthetic fiber multifilament having a total fineness of 50 dtex or less (including the following fiber D) is preferably not mixed, or even if mixed, the mixing ratio is less than 2% by weight.

The student-use knitted fabric of the present embodiment can be easily produced using the above-mentioned synthetic fiber multifilaments A and B, and in some cases fibers C, using a normal knitting machine. Further, as the dyeing process of the knitted fabric, a normal dyeing finishing process can be applied. For example, a liquid flow dyeing machine, a wins dyeing machine and the like can be arbitrarily selected. The heat set by the pin tenter should also be stretched appropriately so that the fabric does not wrinkle.

[Fiber D]
Further, the knitted fabric for students of the present embodiment contains a synthetic fiber multifilament D having a boiling water shrinkage rate of 10% or more, which has a total fineness of 20 dtex or more and 50 dtex or less and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less after heat setting. It may be woven in less than 2% by weight. By making the boiling water shrinkage rate of the synthetic fiber multifilament D higher than the boiling water shrinkage rate of the synthetic fiber multifilaments A and B by 5% or more, the synthetic fiber multifilament D having a boiling water shrinkage rate of 10% or more (hereinafter, shrinkage yarn). D) is shrunk by the heat during dyeing and heat setting, and the loop of synthetic fiber multifilament A, which has the above-mentioned fineness and is resistant to wear, is arranged on the surface of the knitted fabric (Omotemen). A structure having a convex portion is formed of an abrasion-resistant yarn, thereby improving the abrasion resistance of the knitted fabric and further increasing the tendency to impart a favorable elasticity as a knitted fabric for student use.

The student-use knitted fabric of the present embodiment thus obtained is the surface of the knitted fabric (Omotemen) with a pressing load of 9.0 ± 0.2 kPa using a Martindale wear tester specified in JIS L 1096. When rubbing, the number of times of friction when the thread existing on the surface (front) breaks is 30,000 times or more. School uniforms (student clothing) have a long wearing period of at least 3 years, and the wearing time per day is long, so durability due to wear is extremely important. The inventors repeated the test under the harsh conditions of the Martindale method, which wears in all directions, which is usually applied to textiles, and the resistance of the knitted fabric for student use, which has not been achieved so far, is more than 30,000 times. Achieved wear resistance.
In the student-use knitted fabric of the present embodiment, it is preferable that the surface (Omotemen) of the knitted fabric has a snag property of grade 3 or higher after a 15-hour test in accordance with the JIS L 1058 D-3 method.

Further, when the school uniform of the present embodiment is used as the outer material to prepare the school uniform and the outer material is subjected to the water repellent treatment, or before the school uniform is prepared, the knitted fabric itself is subjected to the water repellent treatment. Then, it is possible to manufacture school uniforms having a water repellency of grade 3 or higher by the JIS L 1092 spray method after 30 times of washing according to the JIS L 0217 103 method.
In the student-use knitted fabric of the present embodiment, the surface area to which the water-repellent processing agent adheres increases due to the formation of an uneven structure on the surface of the knitted fabric (Omotemen). As a result, the water repellent agent easily adheres to the surface of the knitted fabric, and a large amount of the water repellent agent remains even after repeated washing, so that the durability is easily maintained for a long time. FIG. 1 is obtained by cutting the knitted fabric of Example 1 and photographing the surface morphology from the cross section with an electron microscope. It can be observed that unevenness is formed on the surface of the knitted fabric by the loop.
On the other hand, FIG. 2 is a photograph of the surface morphology of the smooth circular knitted fabric obtained by the prior art. It can be observed that the loops are lined up at the same height and are smooth. The knitted fabric obtained by the prior art shown in FIG. 2 was produced by the following [method for producing a circular knitted fabric of the prior art], and the anti-snagging property was improved by using a specific yarn and smoothing the surface. However, the design is inferior, and when water-repellent treatment or hydrophilic treatment is performed, the agent is easily removed by washing and the processing durability is inferior.

[Conventional method for manufacturing a circular knitted fabric (Comparative Example 3)]
As shown in FIG. 4, a polyester processed yarn 174 decitex 72 filament A having a strength of 4.1 cN / dtex and an elongation of 26.4% was applied to F3 and F6 using a Fukuhara Seiki 22 gauge 33 inch circular knitting machine. Polyester processed yarn 85 decitex 36 filament B with strength 4.1 cN / dtex and elongation 30.4% to F1 and F4, and polyester processed yarn 110 decitex 48 with strength 2.5 cN / dtex and elongation 18.7%. Filament (second) B was supplied to F2 and F5 to obtain a smooth raw machine having a knitted fabric surface made entirely of A yarn. The obtained raw machine was smelted at 80 ° C. using a continuous water-based relaxing / refining machine, then squeezed with a pin tenter and preset at 190 ° C. × 1 min. Then, a polyester dispersion dyeing at 130 ° C. was performed with a liquid flow dyeing machine, and after soaping, the dough was appropriately stretched to remove wrinkles, and a final set at 170 ° C. × 1 min was performed to obtain a dough. The obtained fabric had a yarn content of 52.1% for A, 30.2% for C, 17.7% for (second) C, 58 courses / inch, 38 wales / inch, and a basis weight of 324 g. / ^{M 2} , the average height Rc was 117.4 μm, the number of times of wear was 35,000, the snag was vertical 4th grade, horizontal 4th grade, and the glare was ×.

Examples of the water repellent used in the water repellent treatment include, but are not limited to, fluorine-based, silicon-based, paraffin-based, ethyleneurea-based, and fatty acid-based water repellents. Therefore, it is preferable to use a fluorine-based or silicon-based water repellent.

Further, the treatment is not limited to the water-repellent treatment, and can be appropriately applied according to the final required characteristics such as water absorption treatment, antibacterial deodorization treatment, and antifouling treatment. As the water absorption treatment, it is preferable to apply a hydrophilic agent such as polyethylene glycol diacrylate or a derivative thereof or a polyethylene terephthalate-polyethylene glycol copolymer to the knitted fabric at the time of dyeing, or to apply it to the knitted fabric in the final setting step. .. Further, the amount of the hydrophilizing agent attached can be 0.25 to 0.5% by weight with respect to the weight of the knitted fabric. As a result, when the school uniform of the present embodiment is used as the outer material to prepare the school uniform and the outer material is subjected to the water absorption treatment, or when the knitted fabric itself is subjected to the water absorption treatment before the school uniform is prepared. , JIS L 0217 103 It is possible to manufacture school uniforms having a water absorption of 5 seconds or less by the JIS L 1907 dropping method after 30 times of washing.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.
First, the methods for measuring various physical properties used in the examples and the like will be described below.

(1) Abrasion resistance Based on the JIS L 1096 fabric test method for woven fabrics and knitted fabrics, a pressing load of 9.0 ± 0.2 kPa is rubbed with a Martindale abrasion tester, and the number of frictions when the yarn on the surface of the knitted fabric breaks. To record. A pass was made when the number of frictions at the time of breakage was 30,000 or more.

(2) Water repellency The water repellency was determined based on the JIS L 1092 spray method. The grade was decided between the 1st grade (worst) and the 5th grade (best) with reference to the comparative sample. Level 3 and above were passed.

(3) Water absorption Based on JIS L 1907, a drop of water was dropped and the time until the specular reflection of the test piece disappeared was measured and recorded with a stopwatch. If it is less than 1 second, that fact is stated.

(4) Snag property The snag property was evaluated by observing the appearance of the sample after operating for 15 hours by the cananoco method (D-3 method) using the ICI type pilling tester described in JIS L 1058. The grade was decided between the standard photograph 1st grade (worst) and 5th grade (best). If it is between the 1st and 2nd grades, it is judged to be 1-2 grade. Vertical and horizontal passed grade 3 or higher.

(5) Glitter (gloss)
The glare was judged by visually confirming the surface of the fabric. The knitted fabric that has strong glare and is not suitable for school uniform is ×, the knitted fabric that has weak glare but cannot be said to have disappeared is △, and the knitted fabric that does not have glare and is suitable for school uniform is ○ It was judged.

(6) Metsuke A sample of 10 cm × 10 cm was cut out from a knitted fabric whose humidity was adjusted at 20 ° C. × 65% RH for one day, and the weight was measured in g with a precision balance and multiplied by 100 to convert to ^{g / m 2.}

(7) Breaking strength and breaking elongation of raw yarn Based on the JIS L 1013 chemical fiber filament yarn test method, the average value measured 5 times on average under the following conditions was obtained. The single yarn fineness was calculated by dividing the fineness of the yarn by the number of filaments.
Specimen length: 200 mm
Tensile speed: 200 mm / min

(8) Average height Rc of contour curve elements
The following measurements were made on the knitted fabric surface (the side that becomes the product table).
The knitted fabric was fixed by fitting it into a circular mold with a diameter of 12 cm so that the surface of the knitted fabric would not have large slack or wrinkles. The central portion of the mold was measured for line roughness at a magnification of 12 times and a length of 10 mm in the horizontal direction of the knitted fabric using a one-shot 3D shape measuring machine VR-3000 manufactured by KEYENCE CORPORATION. The average height Rc of the contour curve element at the measurement length (10 mm) was obtained. The measurement was performed 10 times at the measurement length (10 mm) in which the position was changed, and the average value of the obtained average height Rc was calculated.

(9) Washing treatment The knitted fabric is washed 30 times based on the JIS L 0217 103 method. "After washing" means that the knitted fabric has been subjected to a washing process.

[Example 1]
Fukuhara Seiki Using a 28-gauge 33-inch circular knitting machine, as shown in FIG. 3, polyester processed yarn 176 decitex 48 with a breaking strength of 4.3 cN / dtex, a breaking elongation of 34.5%, and a boiling water shrinkage rate of 4.0%. Plying A with a filament number of 1300 T / m is used at the yarn feeders F3, F7, and F11 with polyester 84 decitex 36 filaments with strength 3.7 cN / dtex, elongation 18.9%, and boiling water shrinkage 4.0%. Plyed yarn B with a twist number of 1600 T / m is converted to F1, F5, F9, and polyester 84 decitex 36 filament processed yarn B with strength 3.7 cN / dtex, elongation 18.9%, and boiling water shrinkage rate 4.0%. , F2, F4, F6, F8, F10, F12 to make a raw machine of twill structure. The obtained raw machine was smelted at 80 ° C. using a continuous water-based relaxing / refining machine, then squeezed with a pin tenter and preset at 190 ° C. × 1 min. After that, 130 ℃ polyester dispersion dyeing is performed with a liquid flow dyeing machine, and after soaping, it is immersed in a water tank to which a fluorine-based water absorption processing agent is added and dehydrated with a mangle. I did a 1min final set and got the dough. The obtained fabric had a polyester 176 decitex 48 filament twisted yarn A54.7%, a polyester 84 decitex 36 filament twisted yarn B24.0%, a polyester 84 decitex 36 filament twisted yarn B21.3%, 48 courses / inch, and 45 wales. / Inch, grain size is 272 g / m ² , average height Rc is 234 μm, number of frictions is 42500 times, snag is vertical 4th grade, horizontal 4th grade, initial water repellency is 4th grade, water repellency after wear is 3rd grade, washing After 30 times, the water repellency was grade 3 and the glare was ◯. The results are shown in Table 1 below.

[Example 2]
Fukuhara Seiki Using a 28-gauge 33-inch circular knitting machine, as shown in FIG. 3, polyester processed yarn 176 decitex 48 with a breaking strength of 4.3 cN / dtex, a breaking elongation of 34.5%, and a boiling water shrinkage rate of 4.0%. Plying A with a filament number of 1600 T / m is used at the yarn feeders F3, F7, and F11 with polyester 84 decitex 36 filaments with strength 3.7 cN / dtex, elongation 18.9%, and boiling water shrinkage 4.0%. Plyed yarn B with a twist number of 1600 T / m is converted to F1, F5, F9, and polyester 84 decitex 36 filament processed yarn B with strength 3.7 cN / dtex, elongation 18.9%, and boiling water shrinkage rate 4.0%. , F2, F4, F6, F8, F10, F12 to make a raw machine of twill structure. The obtained raw machine was smelted at 80 ° C. using a continuous water-based relaxing / refining machine, then squeezed with a pin tenter and preset at 190 ° C. × 1 min. After that, polyester dispersion dyeing at 130 ° C is performed with a liquid flow dyeing machine, and after soaping, the fabric is immersed in a water tank to which a polyester-based water absorption processing agent is added and dehydrated with a mangle. I did a 1min final set and got the dough. The obtained fabric had a polyester 176 decitex 48 filament twisted yarn A58.0%, a polyester 84 decitex 36 filament twisted yarn B24.4%, a polyester 84 decitex 36 filament twisted yarn B17.6%, 50 courses / inch, and 45 wales. / Inch, grain size is 279 g / m ² , average height Rc is 274 μm, number of frictions is 59000 times, snag is vertical 3-4 class, horizontal 3-4 class, initial water absorption is 1 second, water absorption after wear is The water absorption after 5 seconds and 30 times of washing was 1 second, and the glare was ◯. The results are shown in Table 1 below.

[Example 3]
As shown in FIG. 5, a polyester processed yarn having a strength of 4.2 cN / dtex, an elongation of 30.6%, and a boiling water shrinkage of 2.6% was used on a 28-gauge 130-inch tricot machine manufactured by Karl Meyer. 56 decitex 24 filament B was applied to the middle reed and back reed using polyester processed yarn 84 decitex 36 filament A having a strength of 3.7 cN / dtex, an elongation of 18.9%, and a boiling water shrinkage rate of 4.0%. A raw machine was made. The obtained raw machine was processed in the same manner as in Example 2 to obtain a dough. The obtained dough had a polyester processed yarn 56 decitex 24 filament B27.1%, a polyester processed yarn 84 decitex 36 filament A72.8% (middle reed 10.7%, back reed 62.2%), and a weight mixing ratio of the yarn. 54 courses / inch, 36 wales / inch, ^{grain size is 183 g / m 2} , average height Rc is 135 μm, friction frequency is 40,000 times, snag is vertical 4th grade, horizontal 3rd grade, initial water absorption is 1 second, after wear The water absorption was 2 seconds, the water absorption after 30 times of washing was 1 second, and the glare was Δ. The results are shown in Table 1 below.

[Comparative Example 1]
As shown in Fig. 3, using a Fukuhara Seiki 28-gauge 33-inch circular knitting machine, yarn C with a count of 1/80, which is a blend of polyester short fibers and wool short fibers, is spun into yarn inlets F1, F2, F3, F5, and F6. , F7, F9, F10, F11, CD-PET processed yarn 84 decitex 48 filament with strength 3.1cN / dtex, elongation 29.3%, boiling water shrinkage 4.1%, twisted yarn A with twist number 1200T / m To F4, F8, F12, and to F12, a copolymerized polyester shrink yarn 33 decitex 12 filament D having a strength of 4.2 cN / dtex, an elongation of 32.5%, and a boiling water shrinkage rate of 40.8% was supplied. Obtained a raw material for twill tissue. A fabric was obtained by processing in the same manner as in Example 1 except that both wool and polyester were dyed. The obtained fabric has a wool / polyester blend 1/80 D of 83.9%, a CD-PET processed yarn 84 decitex 48 filament twisted yarn A of 12.0%, and a polyester shrink yarn 33 decitex 12 filament B of 4. .1%, 48 courses / inch, 58 wales / inch, ^{grain size is 285 g / m 2} , average height Rc is 76.7 μm, number of wears is 19250 times, snag is vertical 3rd grade, horizontal 3rd grade, initial water repellency 4 The water repellency after grade and abrasion was 2-3 grade, the water repellency after 30 times of washing was grade 2, and the glare was ◯. The results are shown in Table 1 below.

[Comparative Example 2]
As shown in FIG. 3, a polyester processed yarn 56 decitex 24 filament A having a strength of 4.2 cN / dtex, an elongation of 30.6%, and a boiling water shrinkage rate of 2.6% was produced using a Fukuhara Seiki 32-gauge 33-inch knitting machine. , F3, F7, F11, and 60/1 yarn C, which is a blend of cotton and cupra, is supplied to F1, F2, F4, F5, F6, F8, F9, F10, F12 to make a twill structure. I made a raw machine of. The obtained raw machine was processed in the same manner as in Example 1 to obtain a dough. The obtained fabric had a polyester processed yarn 56 decitex 24 filament A of 25.4%, a cotton / cupra blended yarn 60/1 D of 78.6%, 48 courses / inch, 54 wales / inch, and a grain. Is 192 g / m ² , the average height Rc is 82.9 μm, the number of times of wear is 18,500 times, the snag is vertical 2-3 grade, horizontal 2-3 grade, the initial water repellency is 4 grade, and the water repellency after wear is 2. Grade -3, water repellency after 30 times of washing was grade 2, and glare was Δ. The results are shown in Table 1 below.

[Comparative Example 3]
In Comparative Example 3, the above-mentioned circular knitted fabric of the prior art is subjected to water absorption processing in the same manner as in Example 2.

If the school uniform knitted fabric according to the present invention is used as the outer material, the knitted fabric has elasticity while improving the snag and abrasion resistance, which are the drawbacks of the knitted fabric, and the durability of water repellency or water absorption that is incidentally processed during the dyeing process is improved. You can get improved school uniforms.

Claims (11)

Synthetic fiber multifilament A having a total fineness of more than 75 dtex and 220 dtex or less and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less has a mixing ratio of 25% by weight or more and less than 90% by weight, and 1 / of the total fineness of the synthetic fiber multifilament A. A loop density of 35 to 120 courses / 2 in which synthetic fiber multifilament B having a total fineness of 3 to 2/3 and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less is knitted at a mixing ratio of more than 10% by weight and 75% by weight or less. It is a knitted fabric of .54 cm, 35 to 70 wales / 2.54 cm, and the synthetic fiber multifilament A is present on the outermost surface (front) of the knitted fabric, and has a one-shot 3D shape manufactured by Keyence. When the line roughness of the surface (Omotemen) of the knitted fabric is measured with a length of 10 mm in the horizontal direction using a measuring machine VR-3000 at a magnification of 12 times, the average height Rc of the contour curve element is 120 or more and 300. When the surface (Omotemen) of the knitted fabric is rubbed with a pressing load of 9.0 ± 0.2 kPa using the Martindale wear tester specified in JIS L 1096, the surface (Omotemen) is as follows. The number of times of friction when the thread existing in the motemen is broken is 30,000 times or more, and the surface (motemen) is water-repellent, and the washing 30 according to the JIS L 0217 103 method is applied. A knitted fabric for students that is characterized by having a water repellency of grade 3 or higher by the JIS L 1092 spray method after rotation. Synthetic fiber multifilament A having a total fineness of more than 75 dtex and 220 dtex or less and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less has a mixing ratio of 25% by weight or more and less than 90% by weight, and 1 / of the total fineness of the synthetic fiber multifilament A. A loop density of 35 to 120 courses / 2 in which synthetic fiber multifilament B having a total fineness of 3 to 2/3 and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less is knitted at a mixing ratio of more than 10% by weight and 75% by weight or less. It is a knitted fabric of .54 cm, 35 to 70 wales / 2.54 cm, and the synthetic fiber multifilament A is present on the outermost surface (front) of the knitted fabric, and has a one-shot 3D shape manufactured by Keyence. When the line roughness of the surface (Omotemen) of the knitted fabric is measured with a length of 10 mm in the horizontal direction using a measuring machine VR-3000 at a magnification of 12 times, the average height Rc of the contour curve element is 120 or more and 300. When the surface (Omotemen) of the knitted fabric is rubbed with a pressing load of 9.0 ± 0.2 kPa using the Martindale wear tester specified in JIS L 1096, the surface (Omotemen) is as follows. The number of frictions when the thread existing in the motemen is broken is 30,000 times or more, and the surface (motemen) is water-absorbent and washed 30 times according to the JIS L 0217 103 method. A knitted fabric for students, characterized in that the water absorption by the later JIS L 1907 dropping method is 5 seconds or less. The student-use knitted fabric according to claim 1 or 2, wherein the synthetic fiber multifilament D having a total fineness of 50 dtex or less has a mixing ratio of less than 2% by weight. The student-use knitted fabric according to any one of claims 1 to 3, wherein both the synthetic fiber multifilament A and the synthetic fiber multifilament B are false-twisted polyester fibers. The student-use edition according to any one of claims 1 to 4, wherein the synthetic fiber multifilament A has a breaking strength of 3.5 cN / dtex or more and a breaking elongation of 20% or more and 50% or less. Ground. The one according to any one of claims 1 to 5, wherein the knitted fabric is a warp knitted fabric, and the synthetic fiber multifilament A and the synthetic fiber multifilament B are both twisted yarns of 300 to 1200 T / m. Student-use knitted fabric. The knitted fabric is a circular knitted fabric, and a knit loop of the synthetic fiber multifilament A exists on the outermost surface (front side) of the knitted fabric, and the synthetic fiber multifilament A and the synthetic fiber mulch are present. The student-use knitted fabric according to any one of claims 1 to 5, wherein the filament B is a twisted yarn of 1300 to 1900 T / m. The student knitted fabric according to any one of claims 1 to 7, further comprising a fiber C selected from the group consisting of wool, nylon, acrylic, cotton, cupra, and rayon in a mixing ratio of 30% by weight or less. The method according to any one of claims 1 to 8, wherein the surface of the knitted fabric (Omotemen) has a snag property of grade 3 or higher after a 15-hour test in accordance with the JIS L 1058 D-3 method. Knitted fabric for student use. The following steps:
Synthetic fiber multifilament A having a total fineness of more than 75 dtex and 220 dtex or less and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less after heat setting, and a total fineness of 1/3 to 2/3 of the total fineness of the synthetic fiber multifilament A. , A step of knitting a knitted fabric using a synthetic fiber multifilament B having a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less; and a step of heat-setting the obtained knitted fabric;
The method for producing a knitted fabric for student use according to any one of claims 1 to 9, which comprises. A school uniform using the surface (Omotemen) of the school uniform knitted fabric according to any one of claims 1 to 9 as the outer material.

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