JP2024009294A - Knitted fabrics and school uniforms for students - 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 knitted fabric for school uniforms, a method for producing the same, and school uniforms using the knitted fabric as the outer material. More specifically, the present invention relates to a knitted fabric for school uniforms that has abrasion resistance, elasticity, water repellency and water absorption properties with excellent washing durability, a method for producing the same, and school uniforms using the knitted fabric as the outer material.

Traditionally, the mainstream material for school uniforms has been woven fabrics that are firm and well-tailored. For example, Patent Document 1 below proposes a fabric that has a large basis weight and is strong and has excellent quick-drying properties, but this fabric has the drawback of having poor stretchability and being easily wrinkled. On the other hand, in recent years, knitted fabrics with excellent stretchability and wrinkle resistance have been attracting attention from the viewpoint of comfort and easy care.

However, although knitted fabrics have excellent stretch properties, they have drawbacks such as poor abrasion resistance due to rubbing and a snag phenomenon in which loops are pulled out when caught on sharp objects. In order to overcome this drawback, for example, Patent Document 2 below proposes a knitted fabric for school students that exhibits anti-snag properties by using twisted yarn in a part of the knitted fabric and adjusting the knitting yarn length ratio. There is. However, in order to suppress snags, the proposed woven fabric has a problem in that the surface of the knitted fabric is limited to a smooth surface, resulting in a lack of design. In addition, school uniforms made of synthetic fibers must be easy to care for and can be washed in a home washing machine. However, for example, water repellent agents applied after dyeing tend to fall off when washed, making it difficult to maintain their durability. There are no suggestions on how to do this.

Patent No. 5917800 Patent No. 6191067

In view of the above-mentioned prior art, the problem to be solved by the present invention is to provide a knitted fabric for school uniforms that has abrasion durability, elasticity, water repellency and water absorption properties with excellent washing durability, a manufacturing method thereof, and a method for producing the knitted fabric. The aim is to provide school uniforms using the outer material.

As a result of intensive studies and repeated experiments in order to solve the above problems, the present inventors have found that by knitting loops of yarn having a certain thickness so that they are convex on the surface of the knitted fabric (omotemen). , Weak threads are protected from external forces, improving abrasion resistance, and water repellent and water absorbing agents remain in the concave areas, improving washing durability during post-processing.Furthermore, it is possible to create patterns. This was the unexpected discovery that led to the completion of the present invention.

That is, the present invention is as follows.
[1] Synthetic fiber multifilament A having a total fineness of more than 75 dtex and less than 220 dtex, and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less, with a mixing ratio of 25% by weight or more and less than 90% by weight, and the total fineness of synthetic fiber multifilament A Synthetic fiber multifilament B with a total fineness of 1/3 to 2/3 and a single yarn fineness of 1.5 dtex to 5.0 dtex is knitted at a blending rate of more than 10% by weight and 75% by weight or less, with a loop density of 35 to 120. It is a knitted fabric of course/2.54cm, 35-70 wale/2.54cm, the synthetic fiber multifilament A is present on the outermost surface of the knitted fabric, and the synthetic fiber multifilament A is present on the outermost surface of the knitted fabric, When measuring the line roughness of the surface (front surface) of the knitted fabric over a length of 10 mm in the horizontal direction using a shot 3D shape measuring machine VR-3000 at a magnification of 12 times, the average height Rc of the contour curve elements is 120 or more and 300 or less, and when the surface of the knitted fabric is rubbed with a pressing load of 9.0 ± 0.2 kPa using a Martindale abrasion tester specified in JIS L 1096, The number of times of friction when the thread existing on the surface (front surface) breaks is 30,000 times or more, and the surface (front surface) is water-repellent and is in accordance with JIS L 0217 103 method. A knitted fabric for student clothing characterized by having water repellency of grade 3 or higher as determined by the JIS L 1092 spray method after 30 washes.
[2] Synthetic fiber multifilament A having a total fineness of more than 75 dtex and less than 220 dtex, and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less, with a mixing ratio of 25% by weight or more and less than 90% by weight, and the total fineness of synthetic fiber multifilament A Synthetic fiber multifilament B with a total fineness of 1/3 to 2/3 and a single yarn fineness of 1.5 dtex to 5.0 dtex is knitted at a blending rate of more than 10% by weight and 75% by weight or less, with a loop density of 35 to 120. It is a knitted fabric of course/2.54cm, 35-70 wale/2.54cm, the synthetic fiber multifilament A is present on the outermost surface of the knitted fabric, and the synthetic fiber multifilament A is present on the outermost surface of the knitted fabric, When measuring the line roughness of the surface (front surface) of the knitted fabric over a length of 10 mm in the horizontal direction using a shot 3D shape measuring machine VR-3000 at a magnification of 12 times, the average height Rc of the contour curve elements is 120 or more and 300 or less, and when the surface of the knitted fabric is rubbed with a pressing load of 9.0 ± 0.2 kPa using a Martindale abrasion tester specified in JIS L 1096, The number of times of friction when the thread existing on the surface (front surface) breaks is 30,000 times or more, and the surface (front surface) has been subjected to water absorption processing, and is in accordance with JIS L 0217 103 method. A knitted fabric for school uniforms characterized by a water absorbency of 5 seconds or less as measured by the JIS L 1907 dripping method after 30 washes.
[3] The knitted fabric for school uniforms according to [1] or [2] above, wherein the blending ratio of synthetic fiber multifilament D having a total fineness of 50 dtex or less is less than 2% by weight.
[4] The knitted fabric for student wear according to any one of [1] to [3] above, wherein the synthetic fiber multifilament A and the synthetic fiber multifilament B are both false-twisted polyester fibers.
[5] Any one of [1] to [4] above, 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. knitted fabric for student clothes.
[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, [1] to [5] above. The knitted fabric for student clothing described in any of the above.
[7] The knitted fabric is a circular knitted fabric, and a knit loop of the synthetic fiber multifilament A is present on the outermost surface of the knitted fabric, and the synthetic fiber multifilament A and the knitted loop of the synthetic fiber multifilament A are The knitted fabric for student clothes 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 school uniform according to any one of [1] to [7] above, further comprising fiber C selected from the group consisting of wool, nylon, acrylic, cotton, cupro, and rayon at a blending rate of 30% by weight or less. knitted fabric.
[9] Any of the above [1] to [8], wherein the surface of the knitted fabric has a snagging property of grade 3 or higher after a 15-hour test according to JIS L 1058 D-3 method. Knitted fabric for student clothes described in the book.
[10] The following steps:
Synthetic fiber multifilament A with a total fineness of more than 75 dtex and less than 220 dtex and a single yarn fineness of 1.5 dtex and 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 synthetic fiber multifilament A. , a step of knitting a knitted fabric using 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 school uniforms according to any one of [1] to [9] above, comprising:
[11] A school uniform using the surface of the knitted fabric for school uniform according to any one of [1] to [9] above as the outer material.

If the knitted fabric for school uniforms according to the present invention is used as the outer material, it will improve snag and abrasion resistance, which are the drawbacks of knitted fabrics, and will have firmness, and will also improve the durability of the water repellency or water absorption that is added during the dyeing process. You can get improved school uniforms.

1 is an electron micrograph of a cross section of the surface (front surface) of the circular knitted fabric of Example 1. 1 is an electron micrograph of a cross section of the surface (front surface) of a circular knitted fabric obtained by a conventional technique. FIG. 2 is a knitting diagram of circular knitted fabrics of Examples 1 and 2 and Comparative Examples 1 and 2. FIG. 2 is a knitting diagram of an example of a conventional circular knitted fabric. FIG. 3 is a knitting diagram of a warp knitted fabric (one example) of Example 3. FIG. 3 is an explanatory diagram of how to obtain the average height Rc of contour curve elements.

Embodiments of the present invention will be described in detail below.
The knitted fabric for students of this embodiment has a synthetic fiber multifilament A having a total fineness of more than 75 dtex and less than 220 dtex and a single yarn fineness of 1.5 dtex and more and 5.0 dtex at a blending rate of 25% by weight 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 fiber multifilament A and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less is knitted at a blending ratio of more than 10% by weight and not more than 75% by weight. The knitted fabric has a loop density of 35 to 120 courses/2.54 cm and 35 to 70 wales/2.54 cm, and the synthetic fiber multifilament A is on the outermost surface of the knitted fabric. When measuring the line roughness of the surface of the knitted fabric over a length of 10 mm in the horizontal direction using a one-shot 3D shape measuring machine VR-3000 manufactured by Keyence Corporation at a magnification of 12 times, the contour curve The average height Rc of the elements is 120 or more and 300 or less, and the surface of the knitted fabric is ), the number of times of friction when the threads on the surface (front surface) break is 30,000 times or more, and the surface (front surface) is treated with a water-repellent finish, The water repellency as measured by the JIS L 1092 spray method after 30 washes according to the JIS L 0217 103 method is grade 3 or above, or the surface (front surface) has been subjected to a water absorption treatment and the water repellency is rated according to the JIS L 0217 103 method. It is characterized by a water absorption of 5 seconds or less as measured by the JIS L 1907 dropping method after 30 washes according to the above standards.

[Synthetic fiber multifilament A]
The knitted fabric for students' clothes of this embodiment includes synthetic fiber multifilament A (hereinafter also referred to as wear-resistant yarn) having a total fineness of more than 75 dtex and less than 220 dtex and a single yarn fineness of more than 1.5 dtex and less than 5.0 dtex after heat setting. However, the outermost surface (front surface) of the knitted fabric was measured using a one-shot 3D shape measuring machine VR-3000 manufactured by Keyence Corporation at a magnification of 12 times. When measuring the line roughness of the surface (front surface) over a length of 10 mm in the horizontal direction, the average height Rc of the contour curve elements is 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 is preferably 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 stiffness 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 snag resistance are reduced. The synthetic fiber multifilament A is preferably inter-knitted at a blending rate of 25% by weight or more and less than 90% by weight in order to create sufficient convexity on the surface of the knitted fabric. If the blending ratio is less than 25% by weight, there will be insufficient loops that are convex on the surface of the knitted fabric, making it difficult to protect the weak yarns from wear. In order to make the blending 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 knitted fabric that will be worn. good.

The synthetic fiber multifilament A is preferably one with high strength in terms of yarn physical properties, 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, a higher breaking strength is a preferable characteristic value for improving abrasion resistance, but if it exceeds 6.0 cN/dtex, the fiber becomes hard. The elongation at break is more preferably 30% or more and 45% or less. When the elongation at break is less than 20%, fibrillation tends to occur and good abrasion resistance cannot be obtained.On the other hand, when the elongation at break exceeds 50%, the breaking strength is set to 3.5 cN/dtex or more. This becomes difficult. As a method for producing synthetic fiber multifilament A, for example, as described in Japanese Patent No. 5700708, after stretching treatment, relaxation heat treatment is performed in a specific range, and the physical properties of the fiber, particularly strength, elongation, stress, etc. Examples include those in which the differential Young's modulus in the strain curve is defined within a specific range, such as "ELMAX" (registered trademark) manufactured by Asahi Kasei Corporation.

[Synthetic fiber multifilament B]
In addition, in the knitted fabric for students' clothes of this embodiment, the loops made of synthetic fiber multifilament A (wear-resistant yarn A) are made to be more convex on the surface of the knitted fabric after heat setting. The synthetic fiber multifilament B has a total fineness of 1/3 to 2/3 of the total fineness of the wear-resistant yarn A, and a single yarn fineness of 1.5 dtex or more and 5.0 dtex or less, and the blending ratio is more than 10% by weight and 75% by weight or less. It exists like this.
The single fiber 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 weak against friction occupy a large amount of the surface of the knitted fabric, and the abrasion resistance of the knitted fabric decreases. When cross-knitting a knitted fabric, the feeding length of the wear-resistant yarn A having a large total fineness can be lengthened to make the loops easily rise. This makes it possible to create a variety of pattern expressions while imparting abrasion resistance and anti-snag properties to the knitted fabric.
Although the total fineness of the synthetic fiber multifilament may be within the above range, it is preferably greater than 50 dtex in order to ensure the strength and abrasion resistance of the knitted fabric.

The method of knitting the knitted fabric for school uniforms of the present invention is not particularly limited, and may be a warp knitted fabric or a weft knitted fabric. In a horizontal knitted fabric, especially a circular knitted fabric, a method for forming a convex structure of the synthetic fiber multifilament A on the surface of the knitted fabric is to make the synthetic fiber multifilament A a convex structure using the yarn B described above, and It is preferable to alternately arrange loops made of synthetic fiber multifilament A and loops made of synthetic fiber multifilament B to form irregularities in the loops due to differences in fineness, and furthermore, the runner length of synthetic fiber multifilament A with a thicker total fineness is preferable. Conditions can be selected and adjusted as appropriate to suit the knitting structure, such as making the material longer than the synthetic fiber multifilament B, or creating a raised pattern by knitting the A thread on the front side of the product with the B thread from the back side using a tuck structure. .

Due to the combination of the difference in fineness, the weight mix rate of inter-knitting, and the knitting structure, in the knitted fabric for students of this embodiment, the synthetic fiber multifilament A is present on the outermost surface of the knitted fabric. When measuring the line roughness of the surface of the knitted fabric over a length of 10 mm in the horizontal direction using a one-shot 3D shape measuring machine VR-3000 manufactured by Keyence Corporation at a magnification of 12 times, the contour curve element The average height Rc is 120 or more and 300 or less, and the surface of the knitted fabric is tested at a pressing load of 9.0 ± 0.2 kPa using a Martindale abrasion tester specified in JIS L 1096. When friction is applied, the number of times of friction is 30,000 times or more when the threads existing on the surface (front surface) break.
If the average height Rc of the contour curve elements is 120 or more and 300 or less, it can be said that the loops of the wear-resistant yarn are sufficiently exposed on the surface of the knitted fabric.

Hereinafter, with reference to FIG. 6, the average height Rc of the contour curve elements of the knitted fabric surface (front surface) where the composite textured yarn appears will be described below.
If synthetic fiber multifilament A is used in the supply port 1 shown in the knitting structure diagram, knit loops of the composite processed yarn will appear on the surface of the knitted fabric after fabric production. "Knitted fabric bottom" is the bottom of the space existing between knit loops, and "knitted fabric apex" means the apex of the knit loops. 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 top 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 irregularities appear on the surface of the knitted fabric, the Rc value increases. In the knitted fabric for students of this embodiment, the Rc value must be 120 or more and 300 or less, preferably 130 or more and 250 or less. When unevenness is formed on the surface, the protrusions where the strong synthetic fiber multifilament A exists exhibits wear resistance, and the processing agents added in the post-dyeing process are protected from abrasion in the depressions, increasing durability. able to demonstrate. If the Rc value is less than 120, the surface of the knitted fabric tends to be smooth and has good abrasion resistance and anti-snag properties, but since the entire surface of the knitted fabric is abraded, it is difficult for the processing agent to remain and the durability is reduced. Put it away. On the other hand, if the Rc value exceeds 300, the unevenness is too high and it becomes easy to get caught on sharp objects, causing aggravation of snagging.

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

In the knitted fabric for students' clothes of this embodiment, the unevenness can also be emphasized by further mixing synthetic fiber multifilament D with 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, if additional special fibers are mixed, management of durability, dyeability, etc. becomes complicated, and from a cost standpoint, in the present invention, it is recommended not to mix synthetic fiber multifilament with a total fineness of 50 dtex or less. Even if they are mixed, the mixing ratio is preferably less than 2% by weight.

The loop density of the knitted fabric for students' clothes of this 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 or 35 wales/inch, the loops of the abrasion-resistant yarns A, which are convex on the knitted fabric, will be spaced apart, and the weak yarns will be exposed to the surface and abraded. On the other hand, when it exceeds 120 courses/inch and 70 wales/inch, the loop density is too high, resulting in decreased air permeability and stretchability, which adversely affects comfort.

Similarly, for warp knitted fabrics, a predetermined weight mixing ratio can be achieved by adjusting the number of warps of synthetic fiber multifilaments A and B and the arrangement of them through the guides in accordance with the design structure. When knitting the knitted fabric for students' clothes of this embodiment using a warp knitting machine, it is preferable to treat the needle side as the front side of the product in order to maintain the physical properties of the fabric such as snags and pilling. In order to form unevenness, it is preferable to weave the A yarn into the back reed and the B yarn into the front reed or middle reed. For example, a 1-in-1-out method in which one A yarn and one B yarn are alternately passed through the guide of each reed. One example is a method of alternating knitting to create a striped pattern, and by this method, it is possible to achieve a surface condition similar to the above-mentioned circular knitted fabric.

As described above, the synthetic fiber multifilaments A and B are both made of polyester and may be false twisted. The polyester may be synthesized by any method. For example, in the case of polyester, terephthalic acid and ethylene glycol may be subjected to a direct ester chemical reaction, terephthalic acid such as dimethyl terephthalate and ethylene glycol may be transesterified, or lower alkyl esters of terephthalic acid such as dimethyl terephthalate may be used. A first step reaction of producing a glycol ester of terephthalic acid and/or a low polymer thereof by transesterifying L and ethylene glycol or reacting terephthalic acid and ethylene oxide; and a second step reaction in which the reaction product of the first step is heated under reduced pressure to perform a polycondensation reaction until a desired degree of polymerization is achieved. Further, the cross-sectional shape of the single yarn is not particularly limited, and may be a normal round cross-section or an irregular cross-sectional shape. Specific examples of irregular cross-sectional shapes include triangular, square, cross, flat, W-shape, I-shape, and flat shape with constriction.

The polyester fibers may contain a matting agent (titanium oxide compound), ultraviolet absorber, micropore forming agent (organic sulfonic acid metal salt), color inhibitor, heat stabilizer, flame retardant (antimony trioxide), if necessary. Contains 0.1% by weight or more of one or more types of inorganic particles such as , fluorescent whitening agent, coloring pigment, antistatic agent (metal sulfonate), moisture absorbent (polyoxyalkylene glycol), and antibacterial agent. Good too.

The knitted fabric for students' clothes of this embodiment is a circular knitted fabric, and the knit loop of the synthetic fiber multifilament A is present on the outermost surface of the knitted fabric, and the synthetic fiber multifilament Both of the synthetic fiber multifilament B and the synthetic fiber multifilament B may be twisted yarns of 1300 to 1900 T/m.
Synthetic fibers have a unique luster, and when knitted from them, the surface becomes shiny and looks cheap. By twisting the synthetic fibers, it is possible to eliminate the glare of knitted fabrics while giving them firmness, giving them a crisp, wool-like feel that is desirable for school uniforms.
When the knitted fabric for school uniforms of this 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 knitting performance deteriorates. On the other hand, if it is less than 1300 T/m, the shine of the synthetic fibers will be insufficiently removed and the crispness will not be imparted to the synthetic fibers sufficiently.

Further, the knitted fabric for students' clothes 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.
Since torque has a greater effect on the knitting performance of warp knitted fabrics than circular knitting during manufacture, the number of twists of the synthetic fiber multifilaments A and B is preferably 300 to 1200 T/m.

[Fiber C]
The knitted fabric for school uniforms of this embodiment may further contain fiber C selected from the group consisting of wool, nylon, cotton, acrylic, cupro, and rayon at a blending rate of 30% by weight or less.
The knitted fabric for students of this embodiment may be a knitted fabric made only of polyester fibers, but may also be knitted with other fibers, such as nylon, acrylic, cupro, rayon, etc. It may be interwoven with fibers. When inter-knitting other fibers with low strength such as cupro and rayon, it is preferable to knit them into a structure that is not exposed on the surface side of the knitted fabric at a blending rate of 30% by weight or less.
In addition, from the viewpoint of abrasion resistance, it is preferable that synthetic fiber multifilaments having a total fineness of 50 dtex or less (including fiber D below) are not mixed, or even if mixed, the mixing ratio is less than 2% by weight.

The knitted fabric for students' clothing of this embodiment can be easily produced using the synthetic fiber multifilaments A and B, and optionally the fiber C, using a normal knitting machine. Moreover, a normal dyeing finishing process can be applied as a dyeing process for the knitted fabric. For example, a jet dyeing machine, a wince dyeing machine, etc. can be arbitrarily selected. Heat setting with a pin tenter can also be done by stretching the fabric appropriately to avoid wrinkles.

[Fiber D]
In addition, the knitted fabric for students' clothes of this embodiment includes 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 at less than 2% by weight. By making the boiling water shrinkage rate of synthetic fiber multifilament D higher than the boiling water shrinkage rate of synthetic fiber multifilaments A and B by 5% or more, synthetic fiber multifilament D (hereinafter referred to as shrink yarn) having a boiling water shrinkage rate of 10% or more is made. A loop of synthetic fiber multifilament A, which has the above-mentioned fineness and is resistant to abrasion, is arranged on the surface of the knitted fabric. , a structure having convex portions is formed using abrasion-resistant yarn, thereby improving the abrasion resistance of the knitted fabric and further increasing the tendency to impart a stiffness that is desirable as a knitted fabric for school uniforms.

The thus obtained knitted fabric for students' clothes of this embodiment was tested using a Martindale abrasion tester specified in JIS L 1096 at a pressure load of 9.0±0.2 kPa. When rubbed, the number of frictions required for the threads existing on the surface to break is 30,000 times or more. School uniforms (student clothing) are worn for a long time, at least three years, and are worn for a long time each day, so durability against abrasion is extremely important. The inventors repeated tests under harsh conditions using the Martindale method, which applies abrasion in all directions, which is normally applied to textiles, and succeeded in achieving durability of knitted fabric for school uniforms, which can withstand more than 30,000 wear cycles, which has never been achieved before. Achieved wear resistance.
In the knitted fabric for students' wear according to the present embodiment, it is preferable that the surface of the knitted fabric has a snagging property of grade 3 or higher after a 15-hour test according to JIS L 1058 D-3 method.

In addition, when producing school uniforms using the knitted fabric for student wear of this embodiment as an outer material and applying a water-repellent finish to the outer material, or before producing the school uniform, applying a water-repellent finish to the knitted fabric itself. In this case, it is possible to produce school uniforms whose water repellency is grade 3 or higher as measured by the JIS L 1092 spray method after 30 washes according to the JIS L 0217 103 method.
In the knitted fabric for students' clothes of this embodiment, the uneven structure is formed on the surface of the knitted fabric (front surface), thereby increasing the surface area to which the water-repellent agent adheres. This makes it easier for the water repellent to adhere to the surface of the knitted fabric, and even after repeated washing, more water repellent remains, making it more durable. FIG. 1 is an electron microscope photograph of the surface morphology of a cross section of the knitted fabric of Example 1. It can be observed that the loops form irregularities on the surface of the knitted fabric.
On the other hand, FIG. 2 is a photograph of the surface morphology of a smooth circular knitted fabric obtained by the conventional technique. You can see that the loops are lined up at the same height and are smooth. The knitted fabric obtained by the conventional technique shown in Fig. 2 was manufactured by the following [Prior art circular knitted fabric manufacturing method], and the snag resistance was improved by using a specific yarn and smoothing the surface. However, the design is poor, and when water-repellent or hydrophilic finishing is performed, the agent tends to come off when washed, resulting in poor processing durability.

[Conventional technology method for manufacturing circular knitted fabric (Comparative Example 3)]
Using a Fukuhara Seiki 22-gauge 33-inch circular knitting machine, as shown in Fig. 4, polyester processed yarn 174 dtex 72 filament A with a strength of 4.1 cN/dtex and an elongation of 26.4% was made into F3 and F6. Polyester processed yarn 85 dtex 36 filament B with strength 4.1 cN/dtex and elongation 30.4% is used as F1 and F4, and polyester processed yarn 110 dtex 48 with strength 2.5 cN/dtex and elongation 18.7% is used as F1 and F4. Filament (second) B was supplied to F2 and F5 to obtain a smooth gray fabric whose knitted fabric surface was entirely made of A yarn. The obtained gray fabric was refined at 80°C using a continuous water-based relax/refiner, then rolled out using a pin tenter, and preset at 190°C for 1 min. Thereafter, polyester dispersion dyeing was performed at 130°C using a jet dyeing machine, and after soaping, the fabric was stretched appropriately to remove wrinkles, and final setting was performed at 170°C for 1 min to obtain fabric. The obtained fabric has a yarn blending ratio of 52.1% A, 30.2% C, 17.7% (second) C, 58 courses/inch, 38 wales/inch, and has a basis weight of 324 g. /m ² , the average height Rc was 117.4 μm, the number of wears was 35,000 times, the snag was grade 4 vertically, grade 4 horizontally, and the glare was poor.

Examples of water repellents used in water repellent finishing include, but are not limited to, fluorine-based, silicone-based, paraffin-based, ethylene urea-based, fatty acid-based water repellents, etc. However, in terms of washing durability, It is preferable to use a fluorine-based or silicon-based water repellent.

In addition, it is not limited to water-repellent finishing, but can be appropriately applied depending on the final required properties, such as water-absorbing finishing, antibacterial and deodorizing finishing, and antifouling finishing. For water absorption treatment, it is preferable to apply a hydrophilic agent such as polyethylene glycol diacrylate, its derivatives, or polyethylene terephthalate-polyethylene glycol copolymer to the knitted fabric in the same bath during dyeing, or to apply it to the knitted fabric in the final setting process. . Further, the amount of the hydrophilic agent attached may be 0.25 to 0.5% by weight based on the weight of the knitted fabric. As a result, when producing school uniforms using the knitted fabric for student wear of this embodiment as the outer material and applying a water-absorbing finish to the outer fabric, or when applying a water-absorbing finish to the knitted fabric itself before producing the school uniforms. It is possible to produce school uniforms whose water absorbency is 5 seconds or less according to the JIS L 1907 dropping method after 30 washes according to the JIS L 0217 103 method.

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

(1) Abrasion resistance Based on the JIS L 1096 fabric testing method for woven and knitted fabrics, the number of frictions when the yarn on the surface of the knitted fabric breaks when it is rubbed with a press load of 9.0 ± 0.2 kPa using a Martindale abrasion tester. Record. A test piece with a friction count of 30,000 times or more at the time of breakage was considered to be a pass.

(2) Water repellency Water repellency was determined based on the JIS L 1092 spray method. The grades were determined from grade 1 (worst) to grade 5 (best) using comparative samples as reference. Level 3 or above was considered a passing grade.

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

(4) Snagging property Snagging property was evaluated by observing the appearance of the sample after operating for 15 hours using the Kananoko method (D-3 method) using an ICI type pilling tester described in JIS L 1058. Standard photo grades were determined from grade 1 (worst) to grade 5 (best). In addition, if it was between grade 1 and grade 2, it was determined to be grade 1-2. Grade 3 or higher in both vertical and horizontal directions was considered a passing grade.

(5) Glare (glossy)
The glare was determined by visually checking the surface of the fabric. A knitted fabric with strong glare that is not suitable for school uniforms is marked with an ×, a knitted fabric with a weak glare that does not appear to have disappeared is marked with a △, and a knitted fabric with no glare that is suitable for a school uniform is marked with a ○. It was determined that

(6) Fabric weight A 10 cm x 10 cm sample was cut from a knitted fabric that had been conditioned for one day at 20° C. x 65% RH, and its weight was measured in g using a precision balance, and the weight was multiplied by 100 to convert into g/m ² .

(7) Breaking strength and breaking elongation of yarn Based on the JIS L 1013 chemical fiber filament yarn test method, the average value was obtained from measurements made five times on average under the following conditions. Single yarn fineness was calculated by dividing the yarn fineness by the number of filaments.
Test piece length: 200mm
Tensile speed: 200mm/min

(8) Average height Rc of contour curve elements
The following measurements were performed on the surface of the knitted fabric (the side that will become the front side of the product).
The knitted fabric was fixed by fitting it into a circular mold with a diameter of 12 cm to prevent large sag or wrinkles on the surface of the knitted fabric. The line roughness of the central part of the form was measured at 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 at a magnification of 12 times. The average height Rc of the contour curve elements at the measured length (10 mm) was obtained. Measurement was carried out 10 times at different measurement positions (10 mm), and the average value of the obtained average height Rc was calculated.

(9) Washing treatment The knitted fabric was washed 30 times in accordance with JIS L 0217 103 method. "After washing" means that the knitted fabric has been subjected to such washing treatment.

[Example 1]
Using a Fukuhara Seiki 28 gauge 33-inch circular knitting machine, as shown in Figure 3, polyester processed yarn 176 dtex 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% was fabricated. Twisted yarn A with a filament twist number of 1300 T/m was attached to yarn feeders F3, F7, and F11 using polyester 84 dtex 36 filament with a strength of 3.7 cN/dtex, an elongation of 18.9%, and a boiling water shrinkage rate of 4.0%. Twisted yarn B with a twist number of 1600 T/m, F1, F5, and F9, and polyester 84 dtex 36 filament processed yarn B with a strength of 3.7 cN/dtex, an elongation of 18.9%, and a boiling water shrinkage rate of 4.0%. , F2, F4, F6, F8, F10, and F12 to produce twill fabric. The obtained gray fabric was refined at 80°C using a continuous water-based relax/refiner, then rolled out using a pin tenter, and preset at 190°C for 1 min. After that, polyester dispersion dyeing was carried out at 130℃ using a jet dyeing machine, and after soaping, the fabric was immersed in a water tank containing a fluorine-based water absorbing agent, dehydrated with a mangle, and the fabric was stretched moderately to remove wrinkles. A final set of 1 min was performed and the dough was obtained. The resulting fabric has a weight blend of polyester 176 dtex 48 filament twisted yarn A 54.7%, polyester 84 dtex 36 filament twisted yarn B 24.0%, polyester 84 dtex 36 filament B 21.3%, 48 courses/inch, 45 wales. / inch, basis weight is 272 g/m ² , average height Rc is 234 μm, number of frictions is 42,500 times, snag is vertical grade 4, horizontal grade 4, initial water repellency is grade 4, water repellency after wear is grade 3, washing After 30 times, the water repellency was grade 3, and the glare was graded ○. The results are shown in Table 1 below.

[Example 2]
Using a Fukuhara Seiki 28 gauge 33-inch circular knitting machine, as shown in Figure 3, polyester processed yarn 176 dtex 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% was fabricated. Twisted yarn A with a filament twist number of 1600 T/m was attached to yarn feeders F3, F7, and F11 using polyester 84 dtex 36 filament with a strength of 3.7 cN/dtex, an elongation of 18.9%, and a boiling water shrinkage rate of 4.0%. Twisted yarn B with a twist number of 1600 T/m, F1, F5, and F9, and polyester 84 dtex 36 filament processed yarn B with a strength of 3.7 cN/dtex, an elongation of 18.9%, and a boiling water shrinkage rate of 4.0%. , F2, F4, F6, F8, F10, and F12 to produce twill fabric. The obtained gray fabric was refined at 80°C using a continuous water-based relax/refiner, then rolled out using a pin tenter, and preset at 190°C for 1 min. After that, polyester dispersion dyeing was carried out at 130℃ using a jet dyeing machine, and after soaping, the fabric was immersed in a water tank containing a polyester water-absorbing agent, dehydrated with a mangle, and the fabric was stretched appropriately to remove wrinkles. A final set of 1 min was performed and the dough was obtained. The resulting fabric has a weight blend of polyester 176 dtex 48 filament twisted yarn A 58.0%, polyester 84 dtex 36 filament twisted yarn B 24.4%, polyester 84 dtex 36 filament B 17.6%, 50 courses/inch, 45 wales. /inch, the basis weight is 279 g/m ² , the average height Rc is 274 μm, the number of frictions is 59,000 times, the snag is vertical grade 3-4, horizontal grade 3-4, initial water absorption is 1 second, water absorption after wear is After washing for 5 seconds and 30 times, the water absorption was 1 second and the glare was ○. The results are shown in Table 1 below.

[Example 3]
Using a 28-gauge 130-inch tricot machine manufactured by Karl Mayer, a processed polyester yarn with a strength of 4.2 cN/dtex, an elongation of 30.6%, and a boiling water shrinkage rate of 2.6% was fabricated on the front reed, as shown in Figure 5. 56 dtex 24 filament B was used for the middle reed and back reed, and polyester processed yarn 84 dtex 36 filament A with strength 3.7 cN/dtex, elongation 18.9%, and boiling water shrinkage rate 4.0% was used to create a reverse half structure. A gray machine was made. The obtained gray fabric was processed in the same manner as in Example 2 to obtain a fabric. The weight blend ratio of the yarns in the obtained fabric was: polyester processed yarn 56 dtex, 24 filament B 27.1%, polyester processed yarn 84 dtex, 36 filament A 72.8% (middle reed 10.7%, back reed 62.2%). 54 courses/inch, 36 wales/inch, basis weight is 183g/m ² , average height Rc is 135μm, number of frictions is 40,000 times, snag is vertical grade 4, horizontal grade 3, initial water absorption is 1 second, after wear The water absorbency was 2 seconds, the water absorbency after 30 washes was 1 second, and the glare was △. The results are shown in Table 1 below.

[Comparative example 1]
Using a Fukuhara Seiki 28-gauge 33-inch circular knitting machine, as shown in Fig. 3, yarn C with a count of 1/80, which is a blend of short polyester fibers and short wool fibers, is passed through yarn feeders F1, F2, F3, F5, and F6. , F7, F9, F10, F11, CD-PET processed yarn 84 dtex 48 filament with strength 3.1 cN/dtex, elongation 29.3%, boiling water shrinkage rate 4.1%, twisted yarn A with twist number 1200 T/m were supplied to F4, F8, and F12, and a copolymerized polyester shrink yarn 33 dtex 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 to F12. A twill fabric was obtained. A fabric was obtained by processing in the same manner as in Example 1, except that both wool and polyester were dyed. The resulting fabric has a yarn blend ratio of wool/polyester blend 1/80 D 83.9%, CD-PET processed yarn 84 dtex 48 filament twisted yarn A 12.0%, polyester shrink yarn 33 dtex 12 filament B 4 .1%, 48 courses/inch, 58 wales/inch, basis weight is 285 g/m ² , average height Rc is 76.7 μm, number of wears is 19250 times, snag is vertical grade 3, horizontal grade 3, initial water repellency 4 The water repellency after abrasion was grade 2-3, the water repellency after washing 30 times was grade 2, and the glare was graded ○. The results are shown in Table 1 below.

[Comparative example 2]
Using a Fukuhara Seiki 32 gauge 33 inch knitting machine, as shown in Fig. 3, polyester processed yarn 56 dtex 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 fabricated. , to yarn feeders F3, F7, and F11, and then feed yarn C with a count of 60/1, which is a blend of cotton and cupro, to F1, F2, F4, F5, F6, F8, F9, F10, and F12 to create a twill structure. A gray machine was made. The obtained gray fabric was processed in the same manner as in Example 1 to obtain a fabric. The resulting fabric has a yarn blending ratio of 25.4% polyester processed yarn 56 decitex 24 filament A, 78.6% cotton/cupra blend yarn 60/1 D, 48 courses/inch, 54 wales/inch, and weight per unit area. is 192g/m ² , average height Rc is 82.9μm, number of wears is 18,500 times, snag is grade 2-3 vertically, grade 2-3 horizontally, initial water repellency is grade 4, water repellency after wear is 2 -3 grade, water repellency after 30 washes was 2nd grade, and glare was △. The results are shown in Table 1 below.

[Comparative example 3]
Comparative Example 3 is obtained by subjecting the circular knitted fabric of the prior art described above to water absorption processing in the same manner as in Example 2.

If the knitted fabric for school uniforms according to the present invention is used as the outer material, it will improve snag and abrasion resistance, which are the drawbacks of knitted fabrics, and will have firmness, and will also improve the durability of the water repellency or water absorption that is added during the dyeing process. You can get improved school uniforms.

Claims (11)

Synthetic fiber multifilament A with a total fineness of more than 75 dtex and less than 220 dtex, and a single yarn fineness of 1.5 dtex and more than 5.0 dtex, at a blending rate of 25% by weight and less than 90%, and 1/ of the total fineness of synthetic fiber multifilament A. Synthetic fiber multifilament B with a total fineness of 3 to 2/3 and a single yarn fineness of 1.5 dtex to 5.0 dtex is knitted at a blending ratio of more than 10% by weight and less than 75% by weight, with a loop density of 35 to 120 courses/2 .54cm, 35-70 wales/2.54cm knitted fabric, the synthetic fiber multifilament A is present on the outermost surface of the knitted fabric, and the one-shot 3D shape manufactured by Keyence Corporation is used. When measuring the line roughness of the surface (front surface) of the knitted fabric over 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 elements is 120 or more and 300 and when the surface of the knitted fabric is rubbed with a pressing load of 9.0 ± 0.2 kPa using a Martindale abrasion tester specified in JIS L 1096, the surface The number of times of friction when the threads present in the ``Motemen'' break is 30,000 times or more, and the surface of the ``Omotemen'' is water-repellent and can be washed 30 times in accordance with JIS L 0217 103 method. A knitted fabric for school wear, characterized by having water repellency of grade 3 or higher as determined by the JIS L 1092 spray method after washing. Synthetic fiber multifilament A with a total fineness of more than 75 dtex and less than 220 dtex, and a single yarn fineness of 1.5 dtex and more than 5.0 dtex, at a blending rate of 25% by weight and less than 90%, and 1/ of the total fineness of synthetic fiber multifilament A. Synthetic fiber multifilament B with a total fineness of 3 to 2/3 and a single yarn fineness of 1.5 dtex to 5.0 dtex is knitted at a blending ratio of more than 10% by weight and less than 75% by weight, with a loop density of 35 to 120 courses/2 .54cm, 35-70 wales/2.54cm knitted fabric, the synthetic fiber multifilament A is present on the outermost surface of the knitted fabric, and the one-shot 3D shape manufactured by Keyence Corporation is used. When measuring the line roughness of the surface (front surface) of the knitted fabric over 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 elements is 120 or more and 300 and when the surface of the knitted fabric is rubbed with a pressing load of 9.0 ± 0.2 kPa using a Martindale abrasion tester specified in JIS L 1096, the surface The number of times of friction when the threads present on the Omotemens break is 30,000 times or more, and the surface (Omotemens) has been subjected to water absorption treatment, and has been washed 30 times in accordance with JIS L 0217 103 method. A knitted fabric for school uniforms characterized by a water absorbency of 5 seconds or less according to the later JIS L 1907 dripping method. The knitted fabric for school uniforms according to claim 1 or 2, wherein the blending ratio of synthetic fiber multifilament D having a total fineness of 50 dtex or less is less than 2% by weight. The knitted fabric for student wear according to any one of claims 1 to 3, wherein the synthetic fiber multifilament A and the synthetic fiber multifilament B are both false-twisted polyester fibers. The student clothing 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. Earth. 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, according to any one of claims 1 to 5. knitted fabric for student clothes. The knitted fabric is a circular knitted fabric, and a knit loop of the synthetic fiber multifilament A is present on the outermost surface of the knitted fabric, and the synthetic fiber multifilament A and the synthetic fiber multifilament The knitted fabric for school uniforms according to any one of claims 1 to 5, wherein each filament B is a twisted yarn of 1300 to 1900 T/m. The knitted fabric for school uniforms according to any one of claims 1 to 7, further comprising fiber C selected from the group consisting of wool, nylon, acrylic, cotton, cupro, and rayon at a blending rate of 30% by weight or less. The surface of the knitted fabric has a snag resistance of grade 3 or higher after a 15-hour test according to JIS L 1058 D-3 method, according to any one of claims 1 to 8. Knitted fabric for student clothes. The following steps:
Synthetic fiber multifilament A with a total fineness of more than 75 dtex and less than 220 dtex and a single yarn fineness of 1.5 dtex and 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 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 school uniforms according to any one of claims 1 to 9, comprising: A school uniform using the front surface of the knitted fabric for school uniform according to any one of claims 1 to 9 as an outer material.

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