Windproof circular knit fabric

Abstract

To provide a circular knitted fabric excellent in windproofness.SOLUTION: There is provided a windproof circular knitted fabric which is a double-knitted fabric. The circular knitted fabric contains 20 mass% or more of a polybutylene terephthalate false twisted yarn, one surface of the circular knitted fabric has a knit-welt structure, and a ratio of a knit-welt structure to an entire structure of a structure of the one surface is 0.25 or more and 1.00 or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to a circular knit fabric for wind protection. [Background technology]

[0002] Traditionally, knitted fabrics have had the disadvantage of being more breathable and therefore more susceptible to cold than woven fabrics. Various attempts have been made to overcome these drawbacks. For example, Patent Document 1 describes a knitted fabric consisting of one or more layers, wherein at least the outer layer is made of fibers with a single yarn fineness of 0.2 to 3.0 decitex, and at least one layer of the knitted fabric has a stitch density of 45 courses or more / 2.54cm and 45 wales or more / 2.54cm, and the air permeability of the knitted fabric is 5 to 50 cc / cm². 2 ·sec, and a heat-retaining knitted fabric that has been treated with a water-absorbing process is disclosed. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2002-363843 [Overview of the project] [Problems that the invention aims to solve]

[0004] Conventionally, various developments have been made to improve the windproof properties of warp-knitted fabrics, as described in Patent Document 1, but sufficient development has not been made to improve the windproof properties of circular-knitted fabrics. The present invention has been made in view of the above circumstances, and its purpose is to provide a circular-knitted fabric with excellent windproof properties. [Means for solving the problem]

[0005] The windproof circular knit fabric according to an embodiment of the present invention is as follows [1]. [1] A double-knit circular knit fabric, The aforementioned circular knitted fabric contains 20% by mass or more of polybutylene terephthalate false twist yarn, A windproof circular knitted fabric characterized in that one side of the circular knitted fabric has a knit-welt structure, and the ratio of the knit-welt structure to the total structure of the fabric on the one side is 0.25 or more and 1.00 or less.

[0006] As described above, if the ratio of knit-welt structure on one side of the circular knit fabric is 0.25 or more, and the circular knit fabric contains 20% by mass or more of polybutylene terephthalate false twist yarn, the circular knit fabric can exhibit excellent windproof properties. Preferred embodiments of windproof circular knit fabric are any of the following [2] to [8]. [2] The windproof circular knitted fabric according to [1], wherein the polybutylene terephthalate false twist yarn is at least one false twist yarn selected from the group consisting of (1) and (2) below. (1) False twist yarn containing polybutylene terephthalate fibers (2) False twisted yarn containing a composite fiber of polybutylene terephthalate and polyethylene terephthalate [3] The windproof circular knit fabric according to [1] or [2], wherein the coarse density on one of the surfaces is 60 (coarse fibers / 2.54 cm) or more and 120 (coarse fibers / 2.54 cm) or less. [4] A windproof circular knit fabric according to any of [1] to [3], wherein the wale density on one of the aforementioned surfaces is 50 (wales / 2.54 cm) or more and 120 (wales / 2.54 cm) or less. [5] Basis weight 100g / m 2 More than 250g / m 2 Windproof circular knit fabric as described in any of the following [1] to [4]. [6] A windproof circular knitted fabric according to any one of [1] to [5], wherein the ratio of the knit-welt structure composed of the polybutylene terephthalate false-twist yarn to the total structure composed of the polybutylene terephthalate false-twist yarn is 0.45 or more. [7] A windproof circular knit fabric according to any of [1] to [6], wherein the stretch and elongation rate of the polybutylene terephthalate false twist yarn is 40% or more and 70% or less. [8] Air permeability of 10 cc / cm 2 / second or more, 40cc / cm 2 Windproof circular knit fabrics described in any of [1] to [7], which are less than or equal to / seconds.

Advantages of the Invention

[0007] According to the present invention, with the above configuration, a circular knitted fabric excellent in windproof property can be obtained.

Brief Description of the Drawings

[0008] [Figure 1] Figs. 1(a) and (b) are knitting structure diagrams for explaining the knit-welt structure, the knit loops, the tack loops, the welt, and the method of counting the respective numbers. [Figure 2] Fig. 2 is a knitting structure diagram of the knitted fabric of Example 1. [Figure 3] Fig. 3 is a knitting structure diagram of the knitted fabric of Example 2. [Figure 4] Fig. 4 is a knitting structure diagram of the knitted fabric of Example 3. [Figure 5] Fig. 5 is a knitting structure diagram of the knitted fabric of Example 4. [Figure 6] Fig. 6 is a knitting structure diagram of the knitted fabric of Example 5. [Figure 7] Fig. 7 is a knitting structure diagram of the knitted fabric of Example 6. [Figure 8] Fig. 8 is a knitting structure diagram of the knitted fabric of Example 7. [Figure 9] Fig. 9 is a knitting structure diagram of the knitted fabric of Example 8. [Figure 10] Fig. 10 is a knitting structure diagram of the knitted fabric of Example 9. [Figure 11] Fig. 11 is a knitting structure diagram of the knitted fabric of Comparative Example 1. [Figure 12] Fig. 12 is a knitting structure diagram of the knitted fabric of Comparative Example 2.

Mode for Carrying Out the Invention

[0009] [[ID=%]] The circular knitted fabric for wind prevention according to the embodiment is a double-knit circular knitted fabric. The circular knitted fabric contains 20% by mass or more of polybutylene terephthalate false-twisted yarn. One surface of the circular knitted fabric has a knit-welt structure, and the ratio of the knit-welt structure to the entire structure of the tissue on one surface is from 0.25 to 1.00.

[0010] As described above, if the ratio of knit-to-welt structure on one side of the circular knitted fabric is 0.25 or more, and the circular knitted fabric contains 20% by mass or more of polybutylene terephthalate false-twist yarn, the circular knitted fabric can exhibit excellent windproof properties. The following describes in detail each component of the windproof circular knitted fabric. Unless otherwise specified, the yarns, fibers, resins, additives, etc. exemplified in this specification can be used individually or in combination.

[0011] A double-knit circular knit fabric has at least two layers. Preferably, the double-knit circular knit fabric has two layers, an outer layer and an inner layer, or three layers, an outer layer, a middle layer, and an inner layer. This makes it easier to achieve both flexibility and low breathability. The outer and inner layers may be located on either the cylinder side or the dial side of the circular knitting machine. Synthetic fibers are preferred as the fibers constituting each layer. Furthermore, multifilament yarns are preferred as the yarns constituting each layer.

[0012] The circular knitted fabric contains 20% by mass or more of polybutylene terephthalate false twist yarn. Polybutylene terephthalate has greater molecular chain bending than polyethylene terephthalate, and as a result it has superior elasticity and flexibility, which can improve the crimpability of the false twist yarn. This improves the bulkiness of the yarn in the knitted fabric, and the loops of the knitted fabric intertwine strongly with each other, reducing the air permeability. Furthermore, this can reduce the occurrence of runs (snags) in the knitted fabric and lower the difficulty of sewing. For this reason, the content of polybutylene terephthalate false twist yarn in 100% by mass of the circular knitted fabric is preferably 30% by mass or more, more preferably 40% by mass or more, and even more preferably 50% by mass or more. On the other hand, various properties can be imparted to the circular knitted fabric by incorporating yarns other than the polybutylene terephthalate false twist yarn described in (1) and (2) above (hereinafter sometimes referred to as other yarns). In that case, the content of polybutylene terephthalate false twist yarn is preferably 90% by mass or less, and more preferably 80% by mass or less.

[0013] Preferably, at least one side of the circular knitted fabric contains polybutylene terephthalate false-twist yarn. This further improves wind resistance. The ratio of knitted loops made of polybutylene terephthalate false-twist yarn to the total knitted loops in the knitted structure of one side (knitted loop ratio) is preferably 0.3 or higher. This reduces the gaps between loops due to the crimping of the polybutylene terephthalate false-twist yarn, thereby improving wind resistance. Therefore, the knitted loop ratio is more preferably 0.45 or higher, even more preferably 0.65 or higher, even more preferably 0.9 or higher, and most preferably 1.0. On the other hand, if the circular knitted fabric contains other yarns, the content of polybutylene terephthalate false-twist yarn in the structure of one side may be 0.9 or less, or 0.8 or less.

[0014] The polybutylene terephthalate false-twist yarn is preferably at least one false-twist yarn selected from the group consisting of (1) and (2) below. These false-twist yarns have excellent crimpability because they contain polybutylene terephthalate. The polybutylene terephthalate false-twist yarn is preferably a multifilament yarn. (1) False twist yarn containing polybutylene terephthalate fibers (2) False twisted yarn containing a composite fiber of polybutylene terephthalate and polyethylene terephthalate

[0015] The polybutylene terephthalate fibers contained in the false twist yarn of (1) mainly consist of polybutylene terephthalate. The polybutylene terephthalate fibers may contain additives such as inorganic particles like titanium dioxide particles, ultraviolet absorbers, conductive agents, heat storage agents, heat stabilizers, antibacterial agents, lubricants, pigments, and dyes, to the extent that their crimping properties can be utilized. The polybutylene terephthalate fibers preferably contain 90% by mass or more of polybutylene terephthalate, more preferably 95% by mass or more, and even more preferably 99% by mass or more.

[0016] The false-twisted yarn in (1) may contain fibers other than polybutylene terephthalate fibers (other fibers) to the extent that the crimping characteristics can be utilized. Examples of other fibers include nylon fibers such as nylon 6 and nylon 66, cationic dyeable polyester fibers, polyethylene terephthalate fibers, and polytrimethylene terephthalate fibers. For example, the false-twisted yarn in (1) may be a yarn formed by air-blending polybutylene terephthalate fibers and cationic dyeable polyester fibers. The difference in dyeability due to such blending of different fibers can be used to improve the appearance and design.

[0017] The false twisted yarn of (1) preferably contains 60% by mass or more of polybutylene terephthalate fibers, preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 98% by mass or more, and most preferably 100% by mass.

[0018] The composite fiber contained in the false twist yarn of (2) is a so-called conjugate fiber, which is a single fiber formed by bonding two or more types of resin together. Examples of composite fibers include side-by-side structures and core-sheath structures containing both polybutylene terephthalate and polyethylene terephthalate. The composite fiber may contain the above-mentioned additives to the extent that it can take advantage of the crimping characteristics. The composite fiber preferably contains a total of 90% by mass or more of polybutylene terephthalate and polyethylene terephthalate, more preferably 95% by mass or more, and even more preferably 99% by mass or more. Furthermore, the composite fiber preferably contains 40 parts by mass or more and 200 parts by mass or less of polybutylene terephthalate per 100 parts by mass of polyethylene terephthalate, more preferably 70 parts by mass or more and 150 parts by mass or less, and even more preferably 90 parts by mass or more and 110 parts by mass or less. In the case of a core-sheath structure, it is preferable for the arrangement of the core within the sheath to be eccentric in order to produce crimping.

[0019] The false twist yarn of (2) may contain fibers other than the composite fiber of polybutylene terephthalate and polyethylene terephthalate (other fibers) to the extent that the crimping characteristics can be utilized. Examples of other fibers include nylon fibers such as nylon 6 and nylon 66, cationic dyeable polyester fibers, polyethylene terephthalate fibers, and polytrimethylene terephthalate fibers. For example, the false twist yarn of (2) may be a yarn formed by air-blending a composite fiber of polybutylene terephthalate and polyethylene terephthalate with a cationic dyeable polyester fiber. The design of the appearance is improved by utilizing the difference in dyeability due to such blending of different fibers. The false twist yarn of (2) preferably contains 20% by mass or more of the composite fiber of polybutylene terephthalate and polyethylene terephthalate, more preferably 60% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, particularly more preferably 98% by mass or more, and most preferably 100% by mass.

[0020] If the false twist yarn of (2) contains other fibers, it is preferable that the false twist yarn of (2) contains 50 parts by mass or more and 200 parts by mass or less of the other fibers, more preferably 150 parts by mass or less, and even more preferably 100 parts by mass or less, per 100 parts by mass of the composite fiber. This is because the other fibers have lower crimp compared to the composite fiber of polybutylene terephthalate and polyethylene terephthalate.

[0021] The cross-sectional shapes of the fibers contained in the polybutylene terephthalate false-twisted yarn described in (1) and (2) above include round cross-sections, elliptical cross-sections, triangular cross-sections, quadrilateral cross-sections, and hollow cross-sections. Of these, round and elliptical cross-sections are preferred, and round cross-sections are more preferred.

[0022] It is preferable that the elongation rate of the polybutylene terephthalate false-twist yarn is 40% or more and 70% or less. An elongation rate of 70% or less can reduce the occurrence of runs. More preferably it is 60% or less, and even more preferably 55% or less. On the other hand, an elongation rate of 40% or more can improve flexibility. More preferably it is 45% or more. Furthermore, it is preferable that the polybutylene terephthalate false-twist yarn has a higher elongation rate than other yarns. The elongation rate can be measured by the method described in the examples below.

[0023] Methods for forming false twist yarn include spindle false twist, friction disc false twist, and belt false twist.

[0024] The circular knitted fabric may contain yarns other than the polybutylene terephthalate false-twist yarns described in (1) and (2) above, i.e., other yarns. Examples of other yarns include filament yarns and spun yarns, with filament yarns being preferred and multifilament yarns being more preferred. Examples of filament yarns include processed yarns such as flat yarn (raw silk), false-twist yarns, and air-entangled yarns. The other yarns are preferably false-twist yarns and / or composite processed yarns obtained by combining false-twist yarns with other filament yarns, and are more preferably false-twist yarns. This can improve the coverage of the stitches.

[0025] Other yarns include polyester filament yarn or composite yarn containing at least polyester filaments. Using polyester filaments can improve the flexibility and shape retention of the knitted fabric. Other yarns may include synthetic fibers such as polyester fibers, polyamide fibers such as nylon 6 and nylon 66, acrylic fibers, acrylate fibers, and olefin fibers such as polypropylene, biodegradable fibers such as polylactic acid fibers, regenerated fibers such as rayon and lyocell, and known natural fibers such as cotton, linen, and wool. Examples of resin components constituting polyester fibers include polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate, with polyethylene terephthalate and polybutylene terephthalate being preferred, and polyethylene terephthalate being more preferred. Other yarns preferably contain 70% by mass or more of polyester fibers, more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, and most preferably 100% by mass. Furthermore, the polyester fibers may contain the above-mentioned additives. The polyester fiber preferably contains 90% by mass or more polyester, more preferably 95% by mass or more, and even more preferably 99% by mass or more.

[0026] The circular knitted fabric preferably contains 10% by mass or more of other yarns, and more preferably 20% by mass or more. This makes it easier for the properties of the other yarns to be exhibited. On the other hand, considering the content of polybutylene terephthalate false-twist yarn, the content of other yarns is preferably 70% by mass or less, more preferably 60% by mass or less, and even more preferably 50% by mass or less.

[0027] The structure of the other side of the circular knitted fabric and / or the intermediate structure between one side and the other side preferably contains 20% by mass or more of other yarns. This makes it easier for the properties of the other yarns to be exhibited. More preferably 50% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, particularly preferably 95% by mass or more, and most preferably 100% by mass. In addition, the structure of the other side and / or the intermediate structure may contain polybutylene terephthalate false-twist yarn. In that case, the content of other yarns in the structure of the other side and / or the intermediate structure may be 80% by mass or less, 60% by mass or less, or 40% by mass or less.

[0028] If the other yarn is a false-twist yarn, it is preferable that the stretch and elongation rate of the false-twist yarn be 3% or more and 45% or less, and more preferably 10% or more and 30% or less. A stretch and elongation rate of 3% or more makes it easier for the false-twist yarn to cover the stitches. A stretch and elongation rate of 45% or less can improve the texture of the knitted fabric. The stretch and elongation rate can be measured by the method described in the examples below. Examples of false-twist processing include spindle false-twist, friction disc false-twist, and belt false-twist.

[0029] When the circular knit fabric contains filament yarn, the total fineness of the filament yarn is preferably 30 dtex or higher. A fineness of 30 dtex or higher can reduce the transparency of the circular knit fabric and improve its firmness and body. More preferably, it is 50 dtex or higher. On the other hand, a fineness of 100 dtex or lower can reduce the stiffness of the knit fabric, making it suitable for use in shirt fabrics. Therefore, the total fineness of the filament yarn is preferably 100 dtex or lower, more preferably 90 dtex or lower, and even more preferably 80 dtex or lower. Note that yarns of different finenesses within this range may be interwoven.

[0030] The total fineness of the polybutylene terephthalate false twist yarn is preferably 30 dtex or higher. A fineness of 30 dtex or higher improves the firmness and resilience of the circular knitted fabric. More preferably, it is 50 dtex or higher. On the other hand, a fineness of 100 dtex or lower makes it easier to thin and lighten the knitted fabric. Therefore, the total fineness of the polybutylene terephthalate false twist yarn is preferably 100 dtex or lower, more preferably 90 dtex or lower, and even more preferably 80 dtex or lower.

[0031] The total fineness of the other yarns is preferably less than or equal to the total fineness of the polybutylene terephthalate false-twist yarn, and more preferably less than the total fineness of the polybutylene terephthalate false-twist yarn. This makes it easier for the polybutylene terephthalate false-twist yarn to crimp. The ratio of the total fineness of the polybutylene terephthalate false-twist yarn to the average total fineness of the polybutylene terephthalate false-twist yarn and the other yarns is preferably 1.0 or more and 2.0 or less, and more preferably 1.1 or more and 1.8 or less.

[0032] Other cross-sectional shapes of fibers included in the yarn include circular, elliptical, triangular, quadrilateral, and hollow cross-sections. Of these, circular and elliptical cross-sections are preferred, with circular cross-sections being more preferred.

[0033] The single yarn fineness of the fibers included in the circular knit fabric is preferably 1.0 dtex or more and 3.0 dtex or less, and more preferably 1.0 dtex or more and 2.0 dtex or less. A single yarn fineness of 1.0 dtex or more improves the pilling resistance and snagging resistance of the knit fabric. On the other hand, a single yarn fineness of 3.0 dtex or less improves the coverage of the stitches and improves wind resistance.

[0034] The circular knitted fabric preferably contains 70% by mass or more of polyester fibers, more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, and most preferably 100% by mass or more. The polyester fibers are those in which the resin component constituting the fiber is made of a resin having ester bonds, and preferably the resin component is made of at least one resin selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and cationic dyeable polyester, and more preferably the resin component is made of at least one resin selected from the group consisting of polyethylene terephthalate and polybutylene terephthalate. The polyester fibers may also contain the above additives. The polyester fibers preferably contain 90% by mass or more of polyester, more preferably 95% by mass or more, and even more preferably 99% by mass or more.

[0035] One side of the circular knit fabric has a knit-welt structure, and the ratio of the knit-welt structure to the total structure of the fabric on one side is 0.25 or more and 1.00 or less. The knit-welt structure is a structure in which knit loops and welts are connected. During the manufacturing process, the knit loops can be pulled towards the welt side, thereby increasing the density of knit loops per unit area and improving wind resistance. Furthermore, the knit-welt structure makes it easier for the knit loops to be fixed within the knitted fabric, thus reducing elongation in the weft (horizontal) direction. The ratio of the knit-welt structure is preferably 0.30 or more, more preferably 0.40 or more, even more preferably 0.60 or more, even more preferably 0.70 or more, particularly preferably 0.90 or more, and most preferably 1.00. On the other hand, the ratio of the knit-welt structure may be 0.90 or less, 0.80 or less, or 0.70 or less. Furthermore, the above-mentioned knit-welt structure ratio may be satisfied on both sides, one side and the other side.

[0036] In this specification, one of the surfaces may be the outer surface of the circular knitted fabric or the inner surface of the circular knitted fabric. If one surface is the outer surface of the circular knitted fabric, the inner surface of the circular knitted fabric becomes the other surface, and if one surface is the inner surface of the circular knitted fabric, the outer surface of the circular knitted fabric becomes the other surface.

[0037] The ratio of knit-welt structures on one side of a circular knitted fabric can be determined by dividing the number of knit-welt structures present in the structure of one side of the circular knitted fabric by the total number of knit loops, welts, and tucks present in the structure of one side of the circular knitted fabric. In this case, each knit-welt structure is counted as 2. Needles moving from the cylinder needle to the dial needle, or from the dial needle to the cylinder needle, are not counted as knits, welts, or tucks. For example, as shown in the structure diagrams of Figures 2 to 12, tucks are present in the circular knitted fabrics of Examples 1 to 9 and Comparative Examples 1 and 2 described later, but these tucks connect the structure of one side to the structure of the other side and do not constitute the structure of the surface, so such tucks are not counted. Also, in Figures 2 to 12, N, W, and Ta represent knit, welt, and tuck, respectively.

[0038] More specifically, in the mesh reverse structure of Example 1 shown in Figure 2, the number of structures present on one side of the structure is 32, and the number of knit-welt structures is 32, so the ratio of knit-welt structures is 1.00. Also, in the mock rod structure of Example 6 shown in Figure 7, the number of structures present on one side of the structure is 12, and the number of knit-welt structures is 8, so the ratio of knit-welt structures is 0.67. In the structural diagrams of Figures 1 to 12, the lower side corresponds to the cylinder side and the upper side corresponds to the dial side.

[0039] In circular knitted fabrics, the ratio of knit-to-welt structure to the total structure of the overall fabric is preferably 0.20 or more and 0.80 or less. A knit-to-welt structure ratio of 0.20 or more improves the density of knit loops per unit area, thereby improving wind resistance. More preferably, it is 0.30 or more, and even more preferably 0.50 or more. On the other hand, the knit-to-welt structure ratio may be 0.90 or less, or 0.80 or less.

[0040] Next, referring to Figure 1(b), we will explain how to calculate the ratio of knit-welt structures to the total structure of the circular knit fabric. The structure in Figure 1(b) is one in which the knitting yarn forms loops on both the front and back surfaces, with (1), (2), (3), (5), and (6) being knit loops, (4) being a welt, and (7) being a tuck. In other words, the structure in Figure 1(b) consists of 7 loops and welts: 5 knit loops, 1 welt, and 1 tuck. This structure also contains a pair of knit-welt structures (3) and (4), and we will consider this to be 2 in number. Therefore, the ratio of knit-welt structures to the total structure in the structure of Figure 1(b) is calculated as 2 / 7, which is 0.29. However, when calculating the ratio of the knit-to-welt structure to the overall structure of the circular knit fabric, tucks and other elements that connect the structure of one side to the structure of the other side shall be counted. Note that the tucks in (7) constitute the structure of the other side.

[0041] The knit-welt structure is preferably repeated in the course direction, which corresponds to the longitudinal direction of the knitted fabric. This allows the knit loops to be connected skipping a single yarn, resulting in close filling in the course direction and improving wind resistance. It is preferable that one side of the circular knitted fabric has this repeating structure. Alternatively, one side and the other side of the circular knitted fabric may have this repeating structure.

[0042] It is preferable that the ratio of the knit-welt structure of the polybutylene terephthalate false-twist yarn to the total structure of the polybutylene terephthalate false-twist yarn is 0.45 or higher. This makes it easier for the knit-welt structure to exhibit its function. The ratio is more preferably 0.60 or higher, even more preferably 0.80 or higher, even more preferably 0.90 or higher, and most preferably 1.00. Furthermore, this ratio may be satisfied on both sides. When calculating this ratio, tucks and the like that connecting the structure of one side to the structure of the other side shall be counted.

[0043] In circular knitted fabrics, the welt ratio to the overall structure of the entire fabric is preferably 0.20 or more and 0.55 or less. A welt ratio of 0.20 or more suppresses lateral elongation when strong force is applied between loops, thereby reducing the collapse of the loop structure. The low elongation due to this knitted fabric structure, combined with the high crimpability of polybutylene terephthalate false-twist yarn, effectively prevents the occurrence of runs from multiple angles. The welt ratio is more preferably 0.25 or more. On the other hand, a welt ratio of 0.55 or less allows for an increase in the number of knitted loops. The welt ratio is more preferably 0.50 or less, and even more preferably 0.40 or less.

[0044] Next, referring to Figure 1(a), we will explain how to calculate the welt ratio to the overall structure of the circular knit fabric. In the welt jersey knit structure shown in Figure 1(a), the basic structure consists of a total of four components: two knit loops and two welts. Therefore, the welt ratio is (2 / 4) = 0.50. However, when calculating the welt ratio to the overall structure of the circular knit fabric, tucks and other elements that connect the structure of one side to the structure of the other side should be counted.

[0045] It is preferable that the coarse density on one side is 60 (coarse fibers / 2.54 cm) or more and 120 (coarse fibers / 2.54 cm) or less. A coarse density of 60 (coarse fibers / 2.54 cm) or more improves wind resistance. The coarse density is more preferably 65 (coarse fibers / 2.54 cm) or more, even more preferably 80 (coarse fibers / 2.54 cm) or more, and even more preferably 90 (coarse fibers / 2.54 cm) or more. On the other hand, a coarse density of 120 (coarse fibers / 2.54 cm) or less can improve the texture and reduce weight. The coarse density is more preferably 110 (coarse fibers / 2.54 cm) or less. It is more preferable that the circular knit fabric satisfies the said coarse density on one side and the other side, and even more preferable that it satisfies the said coarse density in all layers.

[0046] It is preferable that the wale density on one side is 50 (wale / 2.54 cm) or more and 120 (wale / 2.54 cm) or less. A wale density of 50 (wale / 2.54 cm) or more improves wind resistance. The wale density is more preferably 55 (wale / 2.54 cm) or more, and even more preferably 60 (wale / 2.54 cm) or more. On the other hand, a wale density of 120 (wale / 2.54 cm) or less can improve the texture and reduce weight. The wale density is more preferably 100 (wale / 2.54 cm) or less, and even more preferably 80 (wale / 2.54 cm) or less. It is more preferable that the circular knit fabric satisfies the said wale density on one side and the other side, and even more preferable that the said wale density is satisfied throughout the entire layer.

[0047] In the manufacture of circular knitted fabrics, a high-density knitted fabric can be easily obtained by crimping polybutylene terephthalate false-twist yarn, so the needle density of the circular knitting machine does not need to be high. As for the circular knitting machine, a double-knit machine with a needle bed density (gauge) of 24 or more needles per inch (2.54 cm) and two rows of needle beds is preferred. The knitting machine gauge is preferably 28 to 36 needles / 2.54 cm. By having a knitting machine gauge of 36 needles / 2.54 cm or less, the yarn can be made thicker, improving wind resistance. On the other hand, by having a knitting machine gauge of 28 needles / 2.54 cm or more, the yarn can be made thinner, improving flexibility.

[0048] It is preferable that the loop density per unit area on one side is 4000 or more and 8000 or less. More preferably, it is 5500 or more and 7000 or less. Having a loop density within this range can improve wind resistance and run resistance, and also improve productivity. Loop density per unit area is calculated by multiplying the number of course rows per inch vertically by the number of wale rows per inch horizontally. It is more preferable that the circular knit fabric satisfies this loop density on one side and the other side, and even more preferable that it satisfies this loop density throughout all layers.

[0049] When manufacturing circular knitted fabric, it is preferable to limit the length of yarn per 100 wales (W). Specifically, it is preferable to set the average length of all yarns constituting the circular knitted fabric to 50 mm / 100W or more and 250 mm / 100W or less. This reduces the elongation in the warp and weft compared to conventional knitted fabrics. By controlling the ratio of welts in the knitted structure and the length of yarns constituting the fabric, the shape retention and firmness of the circular knitted fabric can be improved.

[0050] The yarn length of the polybutylene terephthalate false-twisted yarn is preferably 50 mm / 100 W or more and 210 mm / 100 W or less. When it is 50 mm / 100 W or more, it becomes easier to produce stably and the knitting defects can be reduced. On the other hand, when it is 210 mm / 100 W or less, the elongation of the knitted fabric can be reduced. When a plurality of polybutylene terephthalate false-twisted yarns are used in a single texture, the arithmetic mean value of the yarn lengths of the plurality of polybutylene terephthalate false-twisted yarns is taken as the yarn length of the polybutylene terephthalate false-twisted yarn.

[0051] The yarn length of the other yarns other than the polybutylene terephthalate false-twisted yarn is preferably 100 mm / 100 W or more and 250 mm / 100 W or less. When it is 100 mm / 100 W or more, it becomes easier to produce stably and the knitting defects can be reduced. On the other hand, when it is 250 mm / 100 W or less, the elongation of the knitted fabric can be reduced. When a plurality of types and a plurality of the other yarns are used, the arithmetic mean value of the other yarns is taken as the yarn length of the other yarns.

[0052] The ratio of the yarn length of the polybutylene terephthalate false-twisted yarn to the yarn length of the other yarns is preferably 0.60 or more and 1.00 or less, more preferably 0.70 or more and 0.95 or less. When the ratio of the yarn lengths is 0.60 or more, the occurrence of curls and runs can be reduced. On the other hand, when the ratio of the yarn lengths is 1.00 or less, the wind resistance can be improved.

[0053] The circular knitted fabric has a basis weight of 100 g / m 2 or more and 250 g / m 2 or less, which is preferable. When the basis weight is 100 g / m 2 or more, the density of the circular knitted fabric can be improved, the stiffness and firmness can be improved, and the occurrence of runs can be reduced. More preferably, it is 120 g / m 2 or more, and even more preferably 150 g / m 2 or more. On the other hand, when the basis weight is 250 g / m 2 or less, the productivity can be improved. More preferably, it is 230 g / m 2The following applies. The basis weight can be measured by the method described in the examples below.

[0054] The circular knit fabric is preferably 0.3 mm or more and 1.0 mm or less in thickness. A thickness of 0.3 mm or more improves wind resistance. More preferably 0.4 mm or more. On the other hand, a thickness of 1.0 mm or less improves productivity. The thickness can be measured by the method described in the examples below. More preferably 0.8 mm or less. The thickness can be measured by the method described in the examples below.

[0055] The circular knit fabric has a breathability of 10 cc / cm². 2 / second or more, 40cc / cm 2 It is preferable that the air permeability is 40 cc / cm² or less. 2 Wind resistance is improved by having a rate of less than / second. More preferably 30cc / cm². 2 Less than or equal to / second, more preferably 25 cc / cm³ 2 It is less than / second. On the other hand, the air permeability is 15cc / cm 2 It may be more than / second, or 20cc / cm³ 2 The air permeability may be greater than or equal to / second. The air permeability can be measured by the method described in the examples below.

[0056] Circular knitted fabrics preferably have a weft elongation rate of 1% or more and 45% or less. A weft elongation rate of 45% or less can reduce the occurrence of runs. In detail, in the case of circular knitted fabrics made by using low-crimp yarn and high-crimp yarn on the front and back sides respectively, runs (snags) are likely to occur in the warp direction. This is because, due to the difference in elasticity of the front and back sides, when force is applied in the weft direction, the force applied to the low-crimp yarn becomes unevenly distributed, causing the structure to collapse, which then propagates in the warp direction and results in runs. Therefore, by making the weft elongation rate of the knitted fabric at least 45% or less, the occurrence of runs can be reduced. This also makes sewing easier. The weft elongation rate is more preferably 40% or less, even more preferably 35% or less, and even more preferably 30% or less. On the other hand, a weft elongation rate of 1% or more can improve the texture, sewability, and flexibility. The elongation rate in the lateral direction is more preferably 5% or more, and even more preferably 10% or more. The elongation rate in the lateral direction can be measured by the method described in the examples below.

[0057] The circular knit fabric preferably has a vertical elongation rate of 1% or more and 45% or less. A vertical elongation rate of 45% or less reduces the occurrence of runs. This also makes sewing easier. A vertical elongation rate of 40% or less is more preferable, even more preferable is 35% or less, and even more preferable is 30% or less. On the other hand, a vertical elongation rate of 1% or more improves the texture, drapeability, and flexibility. A vertical elongation rate of 5% or more is more preferable, and even more preferable is 10% or more. The vertical elongation rate can be measured by the method described in the examples below.

[0058] To keep the horizontal elongation rate of the circular knitted fabric as low as described above, it is preferable to allow sufficient crimping of the false-twist yarn during the dyeing process to create entanglement between the knitted loops made of bulky yarn, and then to apply a strong heat treatment to the knitted fabric for heat setting. This heat setting is preferably performed at 180°C or higher with dry heat and 120°C or higher with moist heat, and more preferably at 190-210°C with dry heat and 125-135°C with moist heat. Specifically, the raw fabric should be given a strong heat setting after increasing the crimping rate through a continuous relaxation process such as a relaxer. In addition, in order to suppress the horizontal elongation of the circular knitted fabric and adjust the balance of elongation in the vertical and horizontal directions, it is also preferable to pull the horizontal direction slightly more than the vertical direction to finish the knitted fabric with longer horizontal loops.

[0059] The circular knitted fabric preferably has a run resistance of 15N or more, more preferably 20N or more, and even more preferably 25N or more. On the other hand, the run resistance may be 50N or less. The run resistance can be measured by the method described in the examples below.

[0060] Circular knit fabric can be used for cold-weather clothing. Cold-weather clothing containing this circular knit fabric may be worn by humans or by animals. When the cold-weather clothing is for humans, it is preferable that it covers at least part of the feet, hands, abdomen, chest, neck, face, and head, and more preferably that it covers at least part of the chest and abdomen. Specific examples of cold-weather clothing include outerwear, innerwear, sportswear, pajamas, work clothes, socks, gloves, hats, scarves, etc. When the cold-weather clothing is for animals, it can be used, for example, as pet clothing for dogs, cats, etc.; livestock clothing for horses, cows, sheep, etc.; companion animal clothing for reptiles, amphibians, etc.; and wild animal clothing. Furthermore, its form is not particularly limited, but it is preferable that it covers at least part of the animal's chest, abdomen, forelegs, hind legs, neck, and face, and more preferably that it covers at least part of the chest and abdomen.

[0061] The cold-weather garment may, for example, comprise the above-mentioned circular knit fabric and another knit fabric superimposed on the circular knit fabric, but it is preferable that the knit fabric consists of the above-mentioned circular knit fabric. [Examples]

[0062] The present invention will be described in more detail below with reference to examples, but the present invention is not limited by the following examples, and can be implemented with modifications within the scope that is consistent with the spirit of the preceding and following descriptions, and all such modifications are included within the technical scope of the present invention.

[0063] <Yarn stretch rate (%)> JIS-L1013:2010 8.11 Elasticity was measured according to Method A.

[0064] <Elongation rate of knitted fabric (%)> Measurements were taken according to JIS-L1096:2010 8.16 Method B (constant load), with a load of 490 cN.

[0065] <Average yarn length of knitted fabric> The stitch length was measured based on JIS-L1096:2010 8.8 Stitch Length. Specifically, for each type of yarn constituting the knitted structure, the measurement section was set to 100 stitches (100 wales), and the average yarn length of each yarn was calculated by dividing the length of the yarn after unraveling the yarn in the measurement section and applying the initial load by 100. However, in the case of filament yarn, the initial load specified in JIS L 1013 5.1 (Initial Load) was used, and in the case of spun yarn, the initial load specified in JIS L 1095 6.1 (Initial Load) was used.

[0066] <Thickness of knitted fabric> The thickness of the knitted fabric was measured based on the thickness measurement method of JIS-L1096:2010 8.4 A. The constant pressure used in the measurement conditions was set to 23.5 kPa.

[0067] <Fabric weight> The basis weight of the knitted fabric was measured based on the mass per unit area under standard conditions according to JIS-L1096:2010 8.3.2 Method A.

[0068] <Density of knitted fabric> Based on JIS-L1096:2010 8.6.2 Fabric Density, the number of courses (per 2.54 cm) and wales (per 2.54 cm) were measured on one side of the knitted fabric. Note that the number of wales and courses refer to the number of wales per inch in the horizontal direction and the number of courses per inch in the vertical direction of the knitted fabric.

[0069] <Air permeability of knitted fabric> The air permeability of the knitted fabric was measured based on the air permeability (Fragile type method, Method A) specified in JIS-L-1096:2010 8.26.1.

[0070] <Total yarn fineness, number of filaments, single yarn fineness> The total fineness was measured according to Method A of JIS L1013 2010 8.3 and converted to dtex. In addition, the number of filaments was measured according to JIS L1013 2010 8.4, and the single filament fineness was determined by dividing the total fineness by the number of filaments.

[0071] <Run resistance of knitted fabric> Five samples measuring 5 cm in the warp direction and 10 cm in the weft direction were cut from the knitted fabric and prepared by passing the weft threads through the end of the knitting. Next, using a Shimadzu Corporation tensile testing machine (AUTOGRAPH AG-X series), the grab method was used, with chucks attached parallel to the wale direction (warp direction) with a gripping distance of 7 mm, and tensile measurements were taken at a tensile speed of 5 cm / min. The chucks used were grab chucks [front 25 mm x 25 mm, rear 25 mm x 50 mm (width x height)]. The gap between the grips was carefully observed from the start of tensile testing, and the stress value when the knitted fabric collapsed and a run occurred was determined, specifically the stress value of the first peak of the SS curve on the chart. Of the measured values ​​from the five samples, the average of the stress values ​​of three points excluding the highest and lowest values ​​was taken as the run resistance force (N). Runs tended to occur from the chuck gripping area.

[0072] (Example 1) Using a 33-inch, 36-gauge double circular knitting machine (LPJ, manufactured by Fukuhara Seiki Seisakusho), a mesh reverse pattern fabric consisting of complete structures F1 to F12 as shown in Figure 2 was knitted by rib gauging. At that time, 22dtex(T), 24 filament(f) polyethylene terephthalate false twist yarn (SD), a round cross-section yarn with 0.3% by mass of titanium dioxide fine particles kneaded into it, was used for the yarn feed ports F1, 4, 7, and 10. SD stands for semi-dull. Next, 55T, 36f false twist yarn, a round cross-section yarn made of conjugate fibers of polybutylene terephthalate (PBT) and polyethylene terephthalate (PET), was used for the yarn feed ports F2, 3, 5, 6, 8, 9, 11, and 12. The yarn length at each yarn feed port was set to 215mm / 100W for F1, 4, 7, and 10, and 105mm / 100W for F2, 3, 5, 6, 8, 9, 11, and 12. The average yarn length for F1 to F12 was 160mm / 100W.

[0073] The finished raw fabric was opened up, subjected to continuous scouring according to the following formula, and then dyed and finished. Scouring formula: Using a liquid flow dyeing machine NS type manufactured by Hisaka Works, 1 g / l of nonizol N manufactured by Satoda Kako Co., Ltd., 0.5 g / l of NeoCrystal CG1000 manufactured by Nikka Chemical Co., Ltd., and 0.5 g / l of soda ash were used, with the bath temperature set to 60°C → 80°C → 80°C.

[0074] Dyeing formulation: Using a liquid flow dyeing machine NS type manufactured by Hisaka Works, the dyeing process involved a bath ratio of 1:15, dyeing with 0.2 g / l acetic acid (pH=4), 0.5 g / l Disper N 700 manufactured by Meisei Chemical Industry Co., Ltd., 0.5 g / l Neo Crystal GC1000 manufactured by Nikka Chemical Co., Ltd., 1.5% owf SR1800 manufactured by Takamatsu Oil & Fat Co., Ltd., and 0.5% owf dispersible cationic dye Kayacryl Light Blue 4GSL-ED. After dyeing, the material was dehydrated by centrifugation and dried at 120°C for 3 minutes.

[0075] Next, a finishing agent was applied using Sunstat ES-11 1%ows (on the weight of solution), an antistatic agent manufactured by Sanyo Chemical Industries, Ltd. The pick-up rate of the finishing agent was 70%. After that, the final setting was performed using a pin tenter at 160°C for 2 minutes to adjust the properties and obtain the final knitted fabric. In the finishing process, the width was kept to a minimum while removing wrinkles, and the fabric was not stretched in the warp direction.

[0076] (Example 2) Similar to Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ, manufactured by Fukuhara Seiki Seisakusho) was used to knit a mesh reverse pattern fabric consisting of complete structures F1 to F12 as shown in Figure 3, using rib gauging. For the yarn feed ports F1, F4, F7, and F10, a 33dtex(T), 12-filament(f) polyethylene terephthalate false-twist yarn (SD) with 0.3% by mass of titanium dioxide microparticles was used. For the yarn feed ports F2, 3, 5, 6, 8, 9, 11, and 12, the same false-twist yarn as in Example 1 was used. The yarn length for each yarn feed port was 215mm / 100W for F1, 4, 7, and 10, and 105mm / 100W for F2, 3, 5, 6, 8, 9, 11, and 12. The average yarn length for F1-12 was 160mm / 100W. The finished raw fabric was dyed and finished in the same manner as in Example 1.

[0077] (Example 3) Using a 33-inch, 40-gauge double circular knitting machine (Fukuhara Seiki Seisakusho 4AL), a mesh reverse pattern fabric consisting of complete structures F1 to F12 as shown in Figure 4 was knitted using rib gauging. The same false-twist yarn as in Example 2 was used for yarn feed ports F1, F4, F7, and F10. Next, the same false-twist yarn as in Example 1 was used for yarn feed ports F2, 3, 5, 6, 8, 9, 11, and 12. The yarn length for each yarn feed port was 205mm / 100W for F1, 4, 7, and 10, and 100mm / 100W for F2, 3, 5, 6, 8, 9, 11, and 12. The average yarn length for F1-12 was 152mm / 100W. The finished fabric was dyed and finished in the same manner as in Example 1.

[0078] (Example 4) Similar to Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ, manufactured by Fukuhara Seiki Seisakusho) was used to knit a mesh reverse pattern fabric consisting of complete structures F1 to F12 as shown in Figure 5, using rib gauging. The same false-twist yarn as in Example 2 was used for the yarn feed ports F1, F4, F7, and F10. Next, for the yarn feed ports F2, 3, 5, 6, 8, 9, 11, and 12, a polybutylene terephthalate false-twist yarn, specifically 56T, 24f, with a round cross-section, was used. The yarn length for each yarn feed port was 215mm / 100W for F1, 4, 7, and 10, and 105mm / 100W for F2, 3, 5, 6, 8, 9, 11, and 12. The average yarn length for F1-12 was 160mm / 100W. The finished fabric was dyed and finished in the same manner as in Example 1.

[0079] (Example 5) Similar to Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ, manufactured by Fukuhara Seiki Seisakusho) was used to knit a cross-mis-interlock pattern fabric consisting of complete structures F1 to F6 as shown in Figure 6, using rib gauging. For this, polyethylene terephthalate false-twist yarn (SD), 66dtex(T) and 72 filament(f), with 0.3% by mass of titanium dioxide microparticles kneaded into the yarn feed ports F1, 2, and 4, was used. Next, the same false-twist yarn used in yarn feed ports F3, 5, and 6 as in Example 1 (e.g., F2) was used. The yarn length for each yarn feed port was 115mm / 100W for F3 and F6, and 210mm / 100W for F1, 2, 4, and F5. The average yarn length for F1-12 was 162mm / 100W. The finished fabric was dyed and finished in the same manner as in Example 1.

[0080] (Example 6) Similar to Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ, manufactured by Fukuhara Seiki Seisakusho) was used to knit a mock rodie pattern fabric consisting of complete structures F1 to F6 as shown in Figure 7, using rib gauging. At that time, the same false-twist yarn used for yarn feed ports F1, F3, F4, and F6 as used for yarn feed ports F1, F4, F6 in Example 5 was used. Next, the same false-twist yarn used for yarn feed ports F2, F5, F6 in Example 1 was used for yarn feed ports F2, F6, F1, F4, F6. The yarn lengths for each yarn feed port were 210 mm / 100W for F1 and F4, 110 mm / 100W for F2 and F5, and 115 mm / 100W for F3 and F6. The average yarn length for F1 to F6 was 145 mm / 100W. The finished fabric was dyed and finished in the same manner as in Example 1.

[0081] (Example 7) Similar to Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ, manufactured by Fukuhara Seiki Seisakusho) was used to knit a reversible patterned fabric consisting of complete structures F1 to F8 as shown in Figure 8, using rib gauging. At that time, the same false-twist yarn used for yarn feed ports F1 and F5 in Example 2 was used for yarn feed ports F4, F6 and F8. Furthermore, the same false-twist yarn used for yarn feed ports F1 and F8 in Example 5 was used for yarn feed ports F4, F6 and F8. Furthermore, the same false-twist yarn used for yarn feed ports F2, F2 and F8 in Example 1 was used for yarn feed ports F2, F3 and F7. Next, the yarn length for each yarn feed port was set to 115 mm / 100W for F1 and F5, 105 mm / 100W for F2, F3, F6 and F7, and 195 mm / 100W for F4 and F8. The average yarn length for F1 to F8 was 138 mm / 100W. The finished raw fabric was dyed and finished in the same manner as in Example 1.

[0082] (Example 8) Similar to Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ, manufactured by Fukuhara Seiki Seisakusho) was used to knit a mock rodie pattern fabric consisting of complete structures F1 to F6 as shown in Figure 9, using rib gauging. The same false-twist yarn used in yarn feed ports F1 and F4 in Example 5 was used for the feed ports F1 and F4. Next, the same false-twist yarn used in yarn feed ports F2, F3, F5, and F6 in Example 1 was used for the feed ports F2 and F6. The yarn length for each feed port was 210mm / 100W for F1 and F4, and 110mm / 100W for F2, F3, F5, and F6. The average yarn length for F1-6 was 160mm / 100W. The finished fabric was dyed and finished in the same manner as in Example 1.

[0083] (Example 9) Similar to Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ, manufactured by Fukuhara Seiki Seisakusho) was used to knit a mesh reverse pattern fabric consisting of complete structures F1 to F12 as shown in Figure 10 using rib gauging. In this process, the same false-twist yarn used for yarn feed ports F1, F4, F7, and F10 as used for yarn feed port F1 in Example 1 was used. Next, for the yarn feed ports F2, 3, 5, 6, 8, 9, 11, and 12, we used 33T24f false-twist yarn, which is a round cross-section false-twist yarn made of conjugate fibers of polybutylene terephthalate and polyethylene terephthalate, and blended yarns (66(T), 60 filament(f)) of cationic dyeable polyester filament false-twist yarns 33dtex(T) and 36 filament(f). For the blending method, each yarn was subjected to air entanglement treatment using an interlace nozzle. The yarn length for each feeder was 215 mm / 100W for F1, 4, 7, and 10, and 100 mm / 100W for F2, 3, 5, 6, 8, 9, 11, and 12. The average yarn length for F1 to F12 was 158 mm / 100W. The resulting raw fabric was dyed and finished in the same manner as in Example 1.

[0084] (Comparative Example 1) Similar to Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ, manufactured by Fukuhara Seiki Seisakusho) was used to knit a mesh reverse pattern fabric consisting of complete structures F1 to F12 as shown in Figure 11 using rib gauging. At that time, polyethylene terephthalate false twist yarn (SD) of 56tex(T) and 24 filaments(f), which are round cross-section yarns kneaded with 0.3 mass% titanium dioxide fine particles, was used for the yarn feed ports F1, F4, F7, and F10. Next, false twist yarn (SD) of polyethylene terephthalate, which are round cross-section yarns of 44T and 48f, was used for the yarn feed ports F2, 3, 5, 6, 8, 9, 11, and 12. The yarn length for each yarn feed port was 230 mm / 100W for F1, 4, 7, and 10, and 110 mm / 100W for F2, 3, 5, 6, 8, 9, 11, and 12. The average yarn length for F1-F12 was 170mm / 100W. The finished raw fabric was dyed and finished in the same manner as in Example 1.

[0085] (Comparative Example 2) Similar to Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ, manufactured by Fukuhara Seiki Seisakusho) was used to knit a mesh reverse pattern fabric consisting of complete structures F1 to F8 as shown in Figure 12, using rib gauging. At that time, the same false-twist yarn used for yarn feed ports F1, F3, F5, and F7 as used for yarn feed ports F1, etc. in Example 2 was used. Next, for yarn feed ports F2, 4, 6, and 8, the same false-twist yarn used for yarn feed ports F2, etc. in Example 1 was used to knit an all-knit structure. The yarn length for each yarn feed port was 215 mm / 100W for F1, 3, 5, and 7, and 195 mm / 100W for F2, 4, 6, and 8. The average yarn length for F1 to F8 was 205 mm / 100W. The finished fabric was dyed and finished in the same manner as in Example 1.

[0086] The detailed composition of these knitted fabrics and the evaluation results for each are shown in Tables 1 and 2.

[0087] [Table 1]

[0088] [Table 2]

[0089] As shown in Tables 1 and 2, the circular knitted fabrics of Examples 1 to 9 exhibited excellent wind resistance because the ratio of knit-welt structure on one side was within a predetermined range and they contained a predetermined amount of polybutylene terephthalate false-twist yarn. On the other hand, Comparative Example 1 did not contain polybutylene terephthalate false-twist yarn and therefore exhibited poor wind resistance. Comparative Example 2 also lacked a knit-welt structure and therefore exhibited poor wind resistance.

Claims

1. It is a double-knit circular knit fabric, The aforementioned circular knit fabric has an air permeability of 30 cc / cm². ２ - Less than seconds, containing 20% ​​by mass or more of polybutylene terephthalate false twist yarn, The aforementioned polybutylene terephthalate false twist yarn contains 90% by mass or more of polybutylene terephthalate fibers. The aforementioned polybutylene terephthalate fiber contains 90% by mass or more of polybutylene terephthalate, A windproof circular knitted fabric characterized in that one side of the circular knitted fabric has a knit-welt structure, and the ratio of the knit-welt structure to the total structure of the fabric on the one side is 0.50 or more and 1.00 or less.

2. It is a double-knit circular knit fabric, The aforementioned circular knit fabric has an air permeability of 30 cc / cm². ２ - Less than seconds, containing 20% ​​by mass or more of polybutylene terephthalate false twist yarn, The aforementioned polybutylene terephthalate false twist yarn contains 90% by mass or more of a composite fiber of polybutylene terephthalate and polyethylene terephthalate. The composite fiber contains a total of 90% by mass or more of polybutylene terephthalate and polyethylene terephthalate, and contains polybutylene terephthalate in an amount of 90 parts by mass or more and 110 parts by mass or less per 100 parts by mass of polyethylene terephthalate. A windproof circular knitted fabric characterized in that one side of the circular knitted fabric has a knit-welt structure, and the ratio of the knit-welt structure to the total structure of the fabric on the one side is 0.50 or more and 1.00 or less.

3. The windproof circular knit fabric according to claim 1 or 2, wherein the coarse density on one of the aforementioned surfaces is 60 (coarse fibers / 2.54 cm) or more and 120 (coarse fibers / 2.54 cm) or less.

4. The windproof circular knit fabric according to any one of claims 1 to 3, wherein the wale density on one of the aforementioned surfaces is 50 (wales / 2.54 cm) or more and 120 (wales / 2.54 cm) or less.

5. Weight: 100g / m ２ Above, 250g / m ２ Windproof circular knit fabric according to any one of the following claims 1 to 4.

6. The windproof circular knit fabric according to any one of claims 1 to 5, wherein the ratio of the knit-welt structure composed of the polybutylene terephthalate false-twist yarn to the total structure composed of the polybutylene terephthalate false-twist yarn is 0.45 or more.

7. The windproof circular knit fabric according to any one of claims 1 to 6, wherein the stretch elongation rate of the polybutylene terephthalate false twist yarn is 40% or more and 70% or less.

8. Air permeability of 10 cc / cm ２ A windproof circular knit fabric according to any one of claims 1 to 7, which is 2 seconds or longer.

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