Method for manufacturing stretchable warp knitted fabric

Abstract

To make a cut end processing unnecessary and suppress occurrence of curl at the cut end while improving recoverability of a fabric after being repeatedly stretched.SOLUTION: A stretchable warp knitted fabric manufacturing method forms a knitted texture A knitted with a non-elastic yarn, a knitted texture B knitted with a first elastic yarn, and a knitted texture C knitted with a second elastic yarn in this order from a sinker loop face side. The knitted texture A is an atlas stitch texture knitted by arranging the yarn in a full set on a first reed. The knitted texture B is an atlas stitch texture that is knitted by arranging the yarn in a full set on a second reed and has the same course number in the repeating unit as the course number in the repeating unit of the atlas stitch texture of the knitted texture A. The knitted texture C is knitted by arranging a yarn in a full set on a third reed, and has the same course number in the repeating unit as the course number in the repeating unit of the atlas stitch texture of the knitted texture A, and includes an insertion part Y in which no loop is formed and a loop X in the repeating unit.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for producing a stretchable warp knitted fabric. [Background technology]

[0002] In the field of innerwear, after cutting the fabric, the edges are typically folded and sewn on, or a fabric that does not require edge finishing, such as narrow lace, is sewn on. However, if the hemmed area becomes thick, when a tight-fitting outer garment is worn over the innerwear, the hemmed area may appear convex on the outer garment. For this reason, stretchable warp knit fabrics are used, which allow garments to be manufactured by cutting the fabric and not hemming it.

[0003] A prior art document disclosing a warp knitted fabric having edges that do not require edge finishing in an as-cut state is Japanese Patent No. 4945115 (Patent Document 1). The warp knitted fabric described in Patent Document 1 is a stretchable warp knitted fabric made of non-elastic yarn and elastic yarn as knitting yarns. These non-elastic yarn and elastic yarn are both atlas stitches and are knitted in a simultaneous weave, and the atlas stitch of the non-elastic yarn and the atlas stitch of the elastic yarn are knitted by overlapping the loops of each weave so that the closed loops of each weave do not overlap.

[0004] In order for stretchable warp knitted fabrics to be usable in any cutting configuration, it is important that the edges of the warp knitted fabric after cutting are resistant to curling and fraying. Furthermore, in order to improve the ease of putting on and taking off inner garments and the wearing comfort of the inner garments, warp knitted fabrics used for inner garments are required to have high elongation and high recovery. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4945115 Summary of the Invention [Problem to be solved by the invention]

[0006] In the stretchable warp knitted fabric described in Patent Document 1, the fabric has low recovery after repeated stretching and is difficult to return to a flat state. Furthermore, when the cut edge is repeatedly stretched, the fabric curls toward the front side (sinker loop side) or the back side (needle loop side) of the fabric depending on the stretching direction.

[0007] Innerwear using stretchable warp knitted fabrics is generally designed to be worn in close contact with the skin, and therefore repeated stretching of the stretchable warp knitted fabric is unavoidable through everyday movements. If curls form at the cut edges after repeated stretching due to wear, the curled portions will be folded over and become thicker when worn, thereby undermining the advantage of no edge finishing required.

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a method for manufacturing stretchable warp knitted fabric that does not require processing of cut edges, improves the recovery of the fabric after repeated stretching, and suppresses curling at the cut edges. [Means for solving the problem]

[0009] The method for manufacturing a stretchable warp knitted fabric according to the present invention is a method for manufacturing a stretchable warp knitted fabric in which a knitted structure A knitted with a non-elastic yarn, a knitted structure B knitted with a first elastic yarn, and a knitted structure C knitted with a second elastic yarn are knitted in this order from the sinker loop surface side. Knitted structure A is an atlas structure knitted in a full set by a first reed. Knitted structure B is an atlas structure knitted in a full set by a second reed, and the number of courses in one repeat unit is the same as the number of courses in one repeat unit of the atlas structure of knitted structure A. Knitted structure C is knitted in a full set by a third reed, and the number of courses in one repeat unit is the same as the number of courses in one repeat unit of the atlas structure of knitted structure A, and one repeat unit includes an insertion portion where no loops are formed and a loop.

[0010] In one embodiment of the present invention, the knitted structure B is knitted in the reverse direction to the knitted structure A so as to be symmetrical to the knitted structure A.

[0011] In one embodiment of the present invention, the number of courses in one repeat unit of knitted structure A is four.

[0012] In one embodiment of the present invention, a knitted structure D knitted with a third elastic yarn is knitted from the sinker loop surface side after the knitted structure C. The knitted structure D is knitted in a full set by the fourth reed, and is an insertion structure in which no loops are formed in any course of one repeating unit. [Effects of the Invention]

[0013] According to the present invention, a warp knitted fabric is obtained that does not require treatment of the cut edges, and the recovery of the fabric after repeated stretching can be improved while suppressing the occurrence of curling at the cut edges. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a knitting structure diagram showing the basic operations of each reed that knits a stretchable warp knitted fabric in a method for manufacturing a stretchable warp knitted fabric according to one embodiment of the present invention. [Figure 2] 1 is a diagram showing the knitting structure of a stretchable warp knitted fabric according to one embodiment of the present invention. [Figure 3] 10 is a knitting structure diagram showing the basic operations of each reed that knits the stretchable warp knitted fabric in the manufacturing method of the stretchable warp knitted fabric according to Example 2. FIG. [Figure 4] FIG. 10 is a knitting structure diagram of a stretchable warp knitted fabric according to Example 2. [Figure 5] 1 is a knitting structure diagram showing the basic operations of each reed that knits a stretchable warp knitted fabric in a manufacturing method for a stretchable warp knitted fabric according to Comparative Example 1. FIG. [Figure 6] 1 is a knitting structure diagram of a stretchable warp knitted fabric according to Comparative Example 1. FIG. [Figure 7] 10 is a knitting structure diagram showing the basic operations of each reed that knits a stretchable warp knitted fabric in a method for producing a stretchable warp knitted fabric according to Comparative Example 2. FIG. [Figure 8]FIG. 10 is a knitting structure diagram of a stretchable warp knitted fabric according to Comparative Example 2. [Figure 9] FIG. 10 is a diagram illustrating a method for measuring the curl state. [Figure 10] 1 is a graph showing the recovery rates at an elongation of 30% at the time of recovery from the first elongation of each of the third test pieces of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. [Figure 11] 1 is a graph showing the recovery rate at 50% elongation upon recovery from the first elongation of each of the third test pieces of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. [Figure 12] 1 is a graph showing the recovery rates at an elongation of 30% at the time of recovery from the third elongation of each of the third test pieces of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. [Figure 13] 10 is a graph showing the recovery rate at 50% elongation after the third elongation and recovery for each of the third test pieces of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. [Figure 14] 10 is a graph showing the recovery rate at 30% elongation upon recovery from the first elongation of each of the fourth test pieces of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. [Figure 15] 10 is a graph showing the recovery rate at 50% elongation upon recovery from the first elongation of each of the fourth test pieces of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. [Figure 16] 10 is a graph showing the recovery rate at an elongation of 30% at the time of recovery from the third elongation of each of the fourth test pieces of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. [Figure 17] 10 is a graph showing the recovery rate at 50% elongation after the third elongation and recovery of the fourth test pieces of each of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0015] A method for producing a stretchable warp knitted fabric according to one embodiment of the present invention will be described below with reference to the drawings. In the description of the embodiment below, the same or corresponding parts in the drawings will be given the same reference numerals, and description thereof will not be repeated.

[0016] Fig. 1 is a knitting structure diagram showing the basic operations of each reed that knits a stretchable warp knitted fabric in a manufacturing method of a stretchable warp knitted fabric according to one embodiment of the present invention. Fig. 2 is a knitting structure diagram of a stretchable warp knitted fabric according to one embodiment of the present invention.

[0017] As a knitting device for knitting a stretchable warp knitted fabric according to one embodiment of the present invention, for example, a Karl Mayer RSE4N3K Raschel machine can be used. However, the knitting device is not limited to the Karl Mayer RSE4N3K, and the configurations of the control mechanism and the shogging mechanism provided in the knitting device are not particularly limited. Knitting conditions such as the amount of yarn supplied and processing conditions are also not particularly limited.

[0018] 1 and 2, a stretchable warp knitted fabric 10 according to one embodiment of the present invention is knitted using three reeds: a first reed, a second reed, and a third reed. However, the number of reeds used to knit the stretchable warp knitted fabric 10 is not limited to three, and may be four or more.

[0019] In a manufacturing method of an elastic warp knitted fabric 10 according to one embodiment of the present invention, a knitted structure A knitted with a non-elastic yarn 1, a knitted structure B knitted with a first elastic yarn 2, and a knitted structure C knitted with a second elastic yarn 3 are knitted in this order from the sinker loop surface side.

[0020] The basic operation of the first reed has a repeating unit of 12 / 10 / 21 / 23 / / as shown in Figure 1(A). The basic operation of the second reed has a repeating unit of 21 / 23 / 12 / 10 / / as shown in Figure 1(B). The basic operation of the third reed has a repeating unit of 22 / 01 / 11 / 32 / / as shown in Figure 1(C).

[0021] The non-elastic yarn 1 is made of nylon 6,6 and has a thickness of 22 dtex / 20f. However, the material of the non-elastic yarn 1 is not limited to nylon 6,6, and may be other synthetic fibers such as nylon or polyester, regenerated fibers such as rayon or acetate, or natural fibers such as cotton. The non-elastic yarn 1 is not limited to filament yarn, and may be spun yarn, twisted yarn, or textured yarn. There are no particular restrictions on the thickness of the non-elastic yarn 1, but when the stretchable warp knitted fabric 10 is to be used as a fabric for innerwear, a thickness of 17 dtex to 78 dtex is preferable, and 22 dtex to 44 dtex is even more preferable.

[0022] The first elastic yarn 2 is made of polyurethane and has a thickness of 44 dtex. However, the material of the first elastic yarn 2 is not limited to polyurethane and may be other elastic fibers. However, composite yarns with inelastic yarns, such as covering yarns, have relatively low elongation and are thick, and are not suitable for the first elastic yarn 2. There are no particular restrictions on the thickness of the first elastic yarn 2, but when the stretchable warp knitted fabric 10 is to be used as a fabric for innerwear, a thickness of 22 dtex to 78 dtex is preferred, and a thickness of 33 dtex to 50 dtex is even more preferred.

[0023] The second elastic yarn 3 is made of polyurethane and has a thickness of 44 dtex. However, the material of the second elastic yarn 3 is not limited to polyurethane and may be other elastic fibers. However, composite yarns with inelastic yarns, such as covering yarns, have relatively low elongation and are thick, and are not suitable for the second elastic yarn 3. There are no particular restrictions on the thickness of the second elastic yarn 3, but when the stretchable warp knitted fabric 10 is to be used as a fabric for innerwear, a thickness of 22 dtex to 78 dtex is preferred, and a thickness of 33 dtex to 50 dtex is even more preferred.

[0024] As shown in Figures 1(A) and 2, knitted structure A is an atlas structure knitted in a full set by the first reed. In knitted structure A, loops are formed in all courses of one repeating unit, and are knitted in a staggered pattern, shifting alternately in the wale direction around imaginary line V1 as they move in the course direction. The loops may be open or closed. Because knitted structure A has a uniform structure, curling of the fabric can be prevented even after repeated stretching.

[0025] In this embodiment, the number of courses in one repeat unit of the knitted structure A is four. However, the number of courses in one repeat unit of the knitted structure A is not limited to four. If the number of courses in one repeat unit of the knitted structure A is greater than four, the lateral steps of the fabric become more noticeable. Therefore, when the stretchable warp knitted fabric 10 is used as a fabric for innerwear, taking into consideration the appearance quality, texture, and thickness, it is preferable that the knitted structure A be an atlas structure with four courses in one repeat unit.

[0026] In this specification, "knitted with a full set" means that the knitted structure is formed in a portion where the yarn is continuously passed through the guides aligned in the width direction of the reed. Therefore, as long as the knitted structure is knitted with a full set, the yarn does not have to be passed through the guides located at both ends in the width direction of the reed, and there may be guides at both ends in the width direction of the stretchable warp knitted fabric 10 where the yarn is not passed through in order to form selvedge structures.

[0027] As shown in Figures 1(B) and 2, knitted structure B is an atlas structure knitted as a full set by the second reed, in which the number of courses in one repeat unit is the same as the number of courses in one repeat unit of the atlas structure of knitted structure A. Knitted structure B is knitted in the opposite direction to knitted structure A so as to be symmetrical to knitted structure A. However, knitted structure B may also be knitted simultaneously with knitted structure A. In knitted structure B, loops are formed in all courses in one repeat unit, and are knitted in a staggered pattern, shifting alternately in the wale direction around imaginary line V2 as they move in the course direction. The loops may be open or closed.

[0028] In knitting structure B, by forming loops in all courses of one repeat unit, it is possible to prevent needle loops from unraveling when cutting the stretchable warp knitted fabric 10. By heat setting in the dyeing and finishing process after knitting, the connecting loops are heat-fused together, which further prevents unraveling when cutting.

[0029] As shown in Figures 1(C) and 2, knitted structure C is knitted as a full set by the third reed, and the number of courses in one repeat unit is the same as the number of courses in one repeat unit of the atlas structure of knitted structure A, and one repeat unit includes an insertion portion Y in which no loop is formed and a loop X. Knitted structure C is knitted in a staggered pattern, shifting alternately in the wale direction around imaginary line V3 as it moves in the course direction. Note that loop X may be an open stitch or a closed stitch.

[0030] By heat-setting the second elastic yarn 3 in combination with the first elastic yarn 2, the overlapping positions of the needle loops of the knitted structures B and C are firmly heat-sealed, stabilizing the shape of the fabric, improving recovery when stretched, and preventing curling and unraveling.

[0031] If loops are formed in all courses in the knitted structure C, the fabric will be thick, have a hard texture, and lose extensibility, making it unsuitable for innerwear. On the other hand, if loops are not formed in all courses in the knitted structure C, the second elastic yarn 3 and the first elastic yarn 2 cannot be sufficiently heat-fused.

[0032] The inclusion of the insertion portion Y and the loop X in which no loop is formed in one repeat unit of the knitted structure C prevents the fabric from becoming thick, softens the texture, and sufficiently heat-seals the second elastic yarn 3 and the first elastic yarn 2. The ratio of the insertion portion Y to the loop X in one repeat unit of the knitted structure C is not particularly limited, but a ratio of 1:1 is preferred when the stretchable warp knitted fabric 10 is used as a fabric for innerwear.

[0033] The stretchable warp knitted fabric 10 may further include a knitted structure made of fibers such as cotton and rayon intended to impart functionality, as long as the stretchability, appearance quality, and texture required for products in which the stretchable warp knitted fabric 10 is used as fabric are not impaired.

[0034] As described above, knitted structure A is an atlas structure knitted in a full set by the first reed, knitted structure B is an atlas structure knitted in a full set by the second reed and in which the number of courses in one repeat unit is the same as the number of courses in one repeat unit of the atlas structure of knitted structure A, and knitted structure C is knitted in a full set by the third reed and in which the number of courses in one repeat unit is the same as the number of courses in one repeat unit of the atlas structure of knitted structure A, and one repeat unit includes an insertion portion in which no loop is formed and a loop. This makes it unnecessary to treat the cut edge, and it is possible to improve the recovery of the fabric after repeated stretching and shrinkage while suppressing the occurrence of curling at the cut edge.

[0035] (Experimental Example 1) Below, we will explain Experimental Example 1, in which the curl state that occurs in a stretchable warp knitted fabric after stretching was measured. In Experimental Example 1, an experiment was carried out on four types of stretchable warp knitted fabrics: stretchable warp knitted fabric 10 according to Example 1 shown in Figures 1 and 2, and stretchable warp knitted fabrics according to Example 2, Comparative Example 1, and Comparative Example 2. The four types of stretchable warp knitted fabrics were knitted using a Karl Mayer RSE4N3K Raschel knitting machine.

[0036] Fig. 3 is a knitting structure diagram showing the basic operations of each reed that knits a stretchable warp knitted fabric in a manufacturing method of a stretchable warp knitted fabric according to Example 2. Fig. 4 is a knitting structure diagram of the stretchable warp knitted fabric according to Example 2.

[0037] As shown in Figures 3 and 4, in the manufacturing method of the stretchable warp knitted fabric 20 of Example 2, a knitted structure A knitted with a non-elastic yarn 1, a knitted structure B knitted with a first elastic yarn 2, a knitted structure C knitted with a second elastic yarn 3, and a knitted structure D knitted with a third elastic yarn 4 are knitted in this order from the sinker loop surface side.

[0038] The basic operation of the first reed has a repeating unit of 21 / 10 / 12 / 23 / / as shown in Figure 3(A). The basic operation of the second reed has a repeating unit of 12 / 23 / 21 / 10 / / as shown in Figure 3(B). The basic operation of the third reed has a repeating unit of 11 / 01 / 22 / 32 / / as shown in Figure 3(C). The basic operation of the fourth reed has a repeating unit of 00 / 00 / 11 / 11 / / as shown in Figure 3(D).

[0039] The inelastic yarn 1 is made of nylon 6 and has a thickness of 44 dtex / 34f. The first elastic yarn 2 is made of polyurethane and has a thickness of 44 dtex. The second elastic yarn 3 is made of polyurethane and has a thickness of 44 dtex.

[0040] The third elastic yarn 4 is made of polyurethane and has a thickness of 200 dtex. However, the material of the third elastic yarn 4 is not limited to polyurethane and may be other elastic fibers or a composite yarn with a non-elastic yarn such as a covering yarn. There are no particular restrictions on the thickness of the third elastic yarn 4, but when the stretchable warp knitted fabric 10 is used as a fabric for innerwear, a thickness of 22 dtex to 310 dtex is preferable, and a thickness of 33 dtex to 200 dtex is even more preferable.

[0041] As shown in Figures 3(D) and 4, knitted structure D is an insertion structure knitted in a full set by the fourth reed and in which no loops are formed in any course of one repeating unit. Knitted structure D is knitted in a staggered pattern, shifting alternately in the wale direction around imaginary line V4 as it moves in the course direction.

[0042] Curling after stretching occurs due to distortion of the knitted structure caused by stretching and disturbance in the yarn amount distribution within the knitted structure, but knitted structure D has the function of suppressing distortion of the knitted structure and disturbance in the yarn amount distribution within the knitted structure. By making knitted structure D different from knitted structures B and C, the number of contact points between the first elastic yarn 2 and the second elastic yarn 3 and the third elastic yarn 4 increases, making it possible to form a strong network structure by heat fusion of the first elastic yarn 2, the second elastic yarn 3, and the third elastic yarn 4, and effectively suppressing distortion of the knitted structure.

[0043] Fig. 5 is a knitting structure diagram showing the basic operations of each reed that knits a stretchable warp knitted fabric in a manufacturing method of a stretchable warp knitted fabric according to Comparative Example 1. Fig. 6 is a knitting structure diagram of the stretchable warp knitted fabric according to Comparative Example 1.

[0044] As shown in Figures 5 and 6, in the manufacturing method of the stretchable warp knitted fabric 80 according to Comparative Example 1, a knitted structure A knitted with a non-elastic yarn 1 and a knitted structure B knitted with a first elastic yarn 2 are knitted in this order from the sinker loop surface side.

[0045] The basic operation of the first reed has a repeating unit of 21 / 10 / 12 / 23 / / as shown in Figure 5(A). The basic operation of the second reed has a repeating unit of 12 / 23 / 21 / 10 / / as shown in Figure 5(B).

[0046] The inelastic yarn 1 is made of nylon 6 and has a thickness of 44 dtex / 34 f. The first elastic yarn 2 is made of polyurethane and has a thickness of 44 dtex.

[0047] Fig. 7 is a knitting structure diagram showing the basic operations of each reed that knits a stretchable warp knitted fabric in a manufacturing method of a stretchable warp knitted fabric according to Comparative Example 2. Fig. 8 is a knitting structure diagram of a stretchable warp knitted fabric according to Comparative Example 2.

[0048] As shown in Figures 7 and 8, in the manufacturing method of the stretchable warp knitted fabric 90 according to Comparative Example 2, a knitted structure A knitted with a non-elastic yarn 1, a knitted structure B knitted with a first elastic yarn 2, and a knitted structure C knitted with a second elastic yarn 3 are knitted in this order from the sinker loop surface side.

[0049] The basic operation of the first reed has a repeating unit of 21 / 10 / 12 / 23 / / as shown in Figure 7(A). The basic operation of the second reed has a repeating unit of 12 / 23 / 21 / 10 / / as shown in Figure 7(B). The basic operation of the third reed has a repeating unit of 11 / 11 / 00 / 00 / / as shown in Figure 7(C).

[0050] The inelastic yarn 1 is made of nylon 6,6 and has a thickness of 44 dtex / 34f. The first elastic yarn 2 is made of polyurethane and has a thickness of 44 dtex. The third elastic yarn 4 is made of polyurethane and has a thickness of 155 dtex.

[0051] FIG. 9 is a diagram illustrating a method for measuring the curl state. As shown in FIG. 9, a test piece G cut from the target stretchable warp-knit fabric is placed on a flat table. When the end of the test piece G is bent and curled, a line extending in the direction of extension of the test piece G at the end point P of the test piece G is assumed to be a straight line. In other words, a tangent line T to the curve at the end point P of the test piece G is assumed. The rotation angle θ from this tangent line T to the horizontal plane H is measured and taken as the curl angle θ. The measurement result also includes the direction of curl. If there is no curl, the curl angle θ = 0°. The larger the curl angle, the more severe the curl. If there is curl toward the front side of the fabric, the curl angle will be a positive value, and if there is curl toward the back side of the fabric, the curl angle will be a negative value. In the example shown in FIG. 9, when the back side of the fabric is placed in contact with the table, curl toward the front side of the fabric occurs.

[0052] Two types of test specimens G for measuring the curl state after stretching were prepared by cutting the stretchable warp knitted fabric into 9 cm wide and 17 cm long specimens: a first specimen with its long side parallel to the knitting direction and a second specimen with its long side perpendicular to the knitting direction. Each specimen was stretched and flexed at 120% elongation, 200 rpm, and 10,000 cycles using a Kato Tech stretch fatigue tester (a horizontally placed De Mattia bending tester according to JIS K 6260). The curl state of each specimen after stretching was measured. The grip length at each end of the specimen was 5 cm, and the grip spacing was 7 cm. Two specimens were prepared for each test; one was dry and the other was wetted by immersing in water and lightly squeezing.

[0053] [Table 1]

[0054] Table 1 is a table summarizing the results of Experimental Example 1. As shown in Table 1, in Example 1, the curl angle at the cut portion along the wale direction after stretching in the course direction was 0° in both the dry and wet states. The curl angle at the cut portion along the course direction after stretching in the wale direction was -45° in the dry state and -90° in the wet state. Compared to Example 2, the curl angle at the cut portion along the course direction after stretching in the wale direction was slightly larger.

[0055] In Example 2, the curl angle at the cut portion along the wale direction after stretching in the course direction was 0° in both the dry and wet states. The curl angle at the cut portion along the course direction after stretching in the wale direction was 0° in the dry state and -45° in the wet state.

[0056] In Examples 1 and 2, the curl angle was 90° or less both before and after stretching, and when the inner garment was worn after stretching, there was almost no possibility that the curled portion would be folded over and become thick, and the quality of the product was unlikely to be affected.

[0057] In Comparative Example 1, the curl angle at the cut portion along the wale direction after stretching in the course direction was +360° or more in both the dry and wet states. The curl angle at the cut portion along the course direction after stretching in the wale direction was -360° or more in both the dry and wet states.

[0058] In Comparative Example 2, the curl angle at the cut portion along the wale direction after stretching in the course direction was +270° in the dry state and +360° or more in the wet state. The curl angle at the cut portion along the course direction after stretching in the wale direction was -90° in the dry state and -360° or more in the wet state.

[0059] If the curl angle after stretching exceeds 90°, when the inner garment is worn after stretching, the curled portion is likely to be folded over and thickened. If this occurs, the wearer may feel uncomfortable, and the thickened portion may appear as a convex part on the outer garment, reducing the quality of the product.

[0060] From the results of this experiment, it was confirmed that in Examples 1 and 2, curling at the cut edge portions is less likely to occur even after repeated stretching, compared to Comparative Examples 1 and 2.

[0061] (Experimental Example 2) Hereinafter, experimental example 2 will be described, in which the stretch recovery properties of stretchable warp knitted fabrics were measured. In experimental example 2, an experiment was conducted on four types of stretchable warp knitted fabrics according to Example 1, Example 2, Comparative Example 1, and Comparative Example 2.

[0062] Two types of test specimens for measuring stretch recovery were prepared by cutting the stretchable warp-knitted fabric into 2.5 cm wide and 16 cm long specimens: a third specimen with its long side parallel to the knitting direction and a fourth specimen with its long side perpendicular to the knitting direction. Two specimens of each type were prepared. Using a Shimadzu Autograph AG-X (a tensile tester specified in JIS L1096) at a speed of 300 mm / min and an elongation of 80%, the third and fourth specimens were stretched in their respective long-side directions, and the stretch and recovery cycle was repeated three times. The upper and lower grip lengths of the specimens were 2.5 cm, 3.5 cm, and the grip spacing was 10 cm. The stretch and tension forces at 30% and 50% elongation were measured for each specimen during the first and third stretch recovery cycles, and the average values ​​for the two specimens were calculated. Here, the extension force is the load when the elongation increases, and the tension force is the load when the elongation decreases. The recovery rate of each test piece was calculated using the formula: Recovery rate (%) = Tension force ÷ Extension force × 100. The higher the recovery rate, the less power loss there is when the fabric returns to its original shape after being elongated, and the better the fabric's recovery.

[0063] [Table 2]

[0064] Table 2 summarizes the changes in load during the first and third elongation and recovery for the third and fourth test specimens. FIG. 10 is a graph showing the recovery percentages at 30% elongation during the first elongation and recovery for the third test specimens of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. FIG. 11 is a graph showing the recovery percentages at 50% elongation during the first elongation and recovery for the third test specimens of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. FIG. 12 is a graph showing the recovery percentages at 30% elongation during the third elongation and recovery for the third test specimens of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. FIG. 13 is a graph showing the recovery percentages at 50% elongation during the third elongation and recovery for the third test specimens of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. FIG. 14 is a graph showing the recovery percentages at 30% elongation during the first elongation and recovery for the fourth test specimens of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. Fig. 15 is a graph showing the recovery rates at an elongation of 50% after the first stretching and recovery of the fourth test pieces of each of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. Fig. 16 is a graph showing the recovery rates at an elongation of 30% after the third stretching and recovery of the fourth test pieces of each of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. Fig. 17 is a graph showing the recovery rates at an elongation of 50% after the third stretching and recovery of the fourth test pieces of each of Example 1, Example 2, Comparative Example 1, and Comparative Example 2.

[0065] As shown in Table 2 and FIGS. 10 to 17, in Examples 1 and 2, the recovery rates were higher and the fabric recovery properties were superior compared to Comparative Examples 1 and 2.

[0066] The manufacturing method of a stretchable warp knitted fabric according to this embodiment is a manufacturing method of a stretchable warp knitted fabric in which a knitted structure A knitted with a non-elastic yarn, a knitted structure B knitted with a first elastic yarn, and a knitted structure C knitted with a second elastic yarn are knitted in this order from the sinker loop surface side. Knitted structure A is an atlas structure knitted in a full set by a first reed. Knitted structure B is an atlas structure knitted in a full set by a second reed, and the number of courses in one repeat unit is the same as the number of courses in one repeat unit of the atlas structure of knitted structure A. Knitted structure C is knitted in a full set by a third reed, and the number of courses in one repeat unit is the same as the number of courses in one repeat unit of the atlas structure of knitted structure A, and one repeat unit includes an insertion portion where no loops are formed and a loop.

[0067] This makes it possible to obtain a warp knitted fabric that does not require processing of the cut edges, and it is possible to improve the recovery of the fabric after repeated stretching and shrinkage while suppressing the occurrence of curling at the cut edges.

[0068] In this embodiment, the knitted structure B is knitted in the opposite direction to the knitted structure A so as to be symmetrical to the knitted structure A. This makes it easier to balance the inelastic yarn 1 and the first elastic yarn 2, and allows neat stitches to be formed.

[0069] In this embodiment, the number of courses in one repeat unit of the knitted structure A is 4. This makes it possible to make the streaks in the weft direction of the fabric less noticeable.

[0070] In this embodiment, a knitted structure D knitted with a third elastic yarn is knitted from the sinker loop surface side after the knitted structure C. The knitted structure D is knitted in a full set by the fourth reed, and is an insertion structure in which no loops are formed in any course of one repeating unit.

[0071] The knitted structure D increases the number of contact points between the first elastic yarn 2 and the second elastic yarn 3 and the third elastic yarn 4, and a strong mesh structure can be formed by thermal fusion of the first elastic yarn 2, the second elastic yarn 3 and the third elastic yarn 4, thereby effectively suppressing distortion of the knitted structure.

[0072] (Addendum) It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0073] <1> A method for manufacturing a stretchable warp knitted fabric, in which a knitted structure A knitted with a non-elastic yarn, a knitted structure B knitted with a first elastic yarn, and a knitted structure C knitted with a second elastic yarn are knitted in this order from a sinker loop surface side, The knitting structure A is an atlas structure knitted in a full set by the first reed, The knitted structure B is an atlas structure knitted as a full set by a second reed, and the number of courses in one repeating unit is the same as the number of courses in one repeating unit of the atlas structure of the knitted structure A, A method for manufacturing an elastic warp knitted fabric, wherein the knitted structure C is knitted in a full set by a third reed, the number of courses in one repeating unit is the same as the number of courses in one repeating unit of the atlas structure of the knitted structure A, and one repeating unit includes an insertion portion in which no loop is formed and a loop.

[0074] <2> The structure B is structured in the opposite direction to the structure A so as to be symmetrical to the structure A. <1> A method for producing the stretchable warp knitted fabric described in

[0075] <3> The number of courses in one repeat unit of the knitted structure A is 4 courses. <1> or <2> A method for producing the stretchable warp knitted fabric described in

[0076] <4> A knitted structure D knitted with a third elastic yarn is knitted after the knitted structure C from the sinker loop surface side, The knitted structure D is an insertion structure knitted in a full set by the fourth reed, in which no loops are formed in any course of one repeating unit. <1> from <3> A method for producing the stretchable warp knitted fabric according to any one of the above.

[0077] It should be noted that the above-described embodiments and examples disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present invention should not be interpreted solely by the above-described embodiments and examples, but should be defined based on the claims. Furthermore, all modifications within the scope and meaning equivalent to the claims are included. [Explanation of symbols]

[0078] 1 non-elastic yarn, 2 first elastic yarn, 3 second elastic yarn, 4 third elastic yarn, 10, 20, 80, 90 elastic warp knitted fabric.

Claims

1. A method for manufacturing a stretchable warp knitted fabric, in which a knitted structure A knitted with a non-elastic yarn, a knitted structure B knitted with a first elastic yarn, and a knitted structure C knitted with a second elastic yarn are knitted in this order from a sinker loop surface side, The knitting structure A is an atlas structure knitted in a full set by a first reed, The knitted structure B is an atlas structure knitted as a full set by a second reed, and the number of courses in one repeating unit is the same as the number of courses in one repeating unit of the atlas structure of the knitted structure A, The knitted structure C is knitted as a full set by a third reed, the number of courses in one repeating unit is the same as the number of courses in one repeating unit of the atlas structure of the knitted structure A, and one repeating unit includes an insertion part in which no loop is formed and a loop, A method for producing a stretchable warp knitted fabric, wherein loops are formed in all courses in one repeat unit of the knitted structure B.

2. The method for manufacturing a stretchable warp knitted fabric according to claim 1 , wherein the knitted structure B is knitted in a reverse direction to the knitted structure A so as to be symmetrical to the knitted structure A.

3. The method for producing a stretchable warp knitted fabric according to claim 1, wherein the number of courses in one repeating unit of the knitted structure A is four.

4. A knitted structure D knitted with a third elastic yarn is knitted after the knitted structure C from the sinker loop surface side, 4. A method for manufacturing a stretchable warp knitted fabric according to claim 1, wherein the knitted structure D is an insertion structure knitted in a full set by a fourth reed and in which no loops are formed in any course of one repeating unit.

Images