Windproof circular knitted 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] The present invention relates to a circular knitted fabric for wind prevention.

Background Art

[0002] Conventionally, knitted fabrics have had higher breathability than woven fabrics and have had the drawback of being easily ventilated and cold. Various attempts have been made to solve such drawbacks. For example, in Patent Document 1, there is disclosed a knitted fabric composed of a single layer or two or more layers, wherein at least the outer layer is composed of fibers having a single fiber 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 / 2.54 cm and 45 wales or more / 2.54 cm, and the air permeability of the knitted fabric is 5 to 50 cc / cm 2 ·sec, and a heat-insulating knitted fabric subjected to water-absorbing processing is disclosed. Yes.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, various developments have been made for improving the wind resistance of warp knitted fabrics as in Patent Document 1, but the development for improving the wind resistance of circular knitted fabrics has not been sufficiently made. The present invention has been made in view of the above circumstances, and its object is to provide a circular knitted fabric having excellent wind resistance.

Means for Solving the Problems

[0005] The circular knitted fabric for wind prevention according to an embodiment of the present invention is as follows [1]. [1] It 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 texture of the one surface is 0.25 or more and 1.00 or less, which is a circular knitted fabric for wind prevention.

[0006] As described above, since the ratio of the knit-welt structure on one surface 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-twisted yarn, the circular knitted fabric can exhibit excellent wind resistance. Preferred embodiments of the circular knitted fabric for wind prevention are as follows in any one of [2] to [8]. [2] The circular knitted fabric for wind prevention according to [1], wherein the polybutylene terephthalate false-twisted yarn is at least one false-twisted yarn selected from the group consisting of the following (1) and the following (2). (1) A false-twisted yarn containing polybutylene terephthalate fibers (2) A false-twisted yarn containing a composite fiber of polybutylene terephthalate and polyethylene terephthalate [3] The circular knitted fabric for wind prevention according to [1] or [2], wherein the course density on the one surface is 60 (per 2.54 cm) or more and 120 (per 2.54 cm) or less. [4] The circular knitted fabric for wind prevention according to any one of [1] to [3], wherein the wale density on the one surface is 50 (per 2.54 cm) or more and 120 (per 2.54 cm) or less. [5] The circular knitted fabric for wind prevention according to any one of [1] to [4], having a basis weight of 100 g / m 2 or more and 250 g / m 2 or less. [6] The circular knitted fabric for wind prevention according to any one of [1] to [5], wherein the ratio of the knit-welt structure constituted by the polybutylene terephthalate false-twisted yarn to the entire structure constituted by the polybutylene terephthalate false-twisted yarn is 0.45 or more. [7] The circular knitted fabric for wind prevention according to any one of [1] to [6], wherein the elastic elongation rate of the polybutylene terephthalate false-twisted yarn is 40% or more and 70% or less. [8] The air permeability is 10 cc / cm 2 / second or more and 40 cc / cm 2The circular knitted fabric for wind prevention according to any one of [1] to [7] below seconds.

Advantages of the Invention

[0007] According to the present invention, a circular knitted fabric excellent in wind prevention can be obtained by the above configuration.

Brief Description of the Drawings

[0008]

Figure 1

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Modes for Carrying Out the Invention

[0009] 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 0.25 or more and 1.00 or less.

[0010] As described above, since the ratio of the knit-welt structure on one surface 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-twisted yarn, the circular knitted fabric can exhibit excellent windproof performance. Hereinafter, each component of the circular knitted fabric for wind prevention will be described in detail. In addition, the yarns, fibers, resins, additives, etc. exemplified in this specification can be used alone or in combination of multiple types unless otherwise specified.

[0011] The double-knit circular knitted fabric has at least two or more layers of tissue. The double-knit circular knitted fabric preferably 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 air permeability. Note that the outer layer and the inner layer 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. Also, 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-twisted yarn. Polybutylene terephthalate has a greater molecular chain bend compared to polyethylene terephthalate, and due to this, it is excellent in elasticity and flexibility, so the crimpability of the false-twisted yarn can be improved. As a result, the bulkiness of the yarns in the knitted fabric is improved, and the loops in the knitted fabric are strongly intertwined with each other, reducing the air permeability. Furthermore, this can reduce the occurrence of runs (transmission lines) in the knitted fabric and lower the sewing difficulty. Therefore, in 100% by mass of the circular knitted fabric, polybutylene terephthalate The content rate of the false-twisted yarn is preferably 30% by mass or more, more preferably 40% by mass or more, still more preferably 50% by mass or more. On the other hand, by incorporating yarns other than the polybutylene terephthalate false-twisted yarns of the above (1) and (2) (hereinafter sometimes referred to as other yarns) into the circular knitted fabric, various properties can be imparted. In that case, the content rate of the polybutylene terephthalate false-twisted yarn is preferably 90% by mass or less, and more preferably 80% by mass or less.

[0013] At least one surface of the circular knitted fabric preferably contains a polybutylene terephthalate false-twisted yarn. Thereby, the windproof property can be further improved. The constituent ratio (knit loop ratio) of the knit loops of the polybutylene terephthalate false-twisted yarn to all the knit loops in the knitting structure of one surface is preferably 0.3 or more. Thereby, due to the crimp of the polybutylene terephthalate false-twisted yarn, the gaps between the loops can be reduced and the windproof property can be improved. Therefore, the knit loop ratio is more preferably 0.45 or more, still more preferably 0.65 or more, even more preferably 0.9 or more, and most preferably 1.0. On the other hand, when the circular knitted fabric contains other yarns, the content rate of the polybutylene terephthalate false-twisted yarn in the structure of one surface may be 0.9 or less, or may be 0.8 or less.

[0014] The polybutylene terephthalate false-twisted yarn is preferably at least one false-twisted yarn selected from the group consisting of the following (1) and the following (2). Since these false-twisted yarns contain polybutylene terephthalate, they are excellent in crimpability. The polybutylene terephthalate false-twisted yarn is preferably a multifilament yarn. (1) A false-twisted yarn containing polybutylene terephthalate fibers (2) A false-twisted yarn containing a composite fiber of polybutylene terephthalate and polyethylene terephthalate

[0015] (1) The polybutylene terephthalate fiber contained in the false-twisted yarn may mainly consist of polybutylene terephthalate. The polybutylene terephthalate fiber may contain additives such as inorganic particles such as titanium oxide particles, ultraviolet absorbers, conductive agents, heat storage agents, heat stabilizers, antibacterial agents, lubricants, pigments, dyes, etc., within the range where the crimp characteristics can be utilized. The polybutylene terephthalate fiber preferably contains 90% by mass or more of polybutylene terephthalate, more preferably 95% by mass or more, and still more preferably 99% by mass or more.

[0016] (1) The false-twisted yarn may contain fibers other than polybutylene terephthalate fibers (other fibers) within the range where the crimp characteristics can be utilized. Examples of other fibers include nylon fibers such as nylon 6 and nylon 66, cation-dyeable polyester fibers, polyethylene terephthalate fibers, polytrimethylene terephthalate fibers, etc. For example, the false-twisted yarn of (1) may be a yarn formed by air-mixing polybutylene terephthalate fibers and cation-dyeable polyester fibers. The design of the appearance can be improved by utilizing the difference in dyeability due to such blending of different fibers.

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

[0018] (2) The composite fiber contained in the false-twisted yarn is a so-called conjugate fiber, which is a single fiber formed by laminating two or more kinds of resins. Examples of the composite fiber include composite fibers having a side-by-side structure, a core-sheath structure, etc., containing both components of polybutylene terephthalate and polyethylene terephthalate. The composite fiber may contain the above additives within the range where the above crimp characteristics can be utilized. The composite fiber preferably contains 90% by mass or more in total of polybutylene terephthalate and polyethylene terephthalate, 95 mass It is more preferably contained in an amount of 95% by mass or more, and even more preferably contained in an amount of 99% by mass or more. Further, the composite fiber preferably contains 40 parts by mass or more and 200 parts by mass or less of polybutylene terephthalate with respect to 100 parts by mass of polyethylene terephthalate, more preferably contains 70 parts by mass or more and 150 parts by mass or less, and even more preferably contains 90 parts by mass or more and 110 parts by mass or less. In the case of the core-sheath structure, it is preferable that the arrangement of the core in the sheath is eccentric in order to produce crimp.

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

[0020] When the false-twisted yarn of (2) contains other fibers, the false-twisted yarn of (2) preferably contains 50 parts by mass or more and 200 parts by mass or less of other fibers with respect to 100 parts by mass of the composite fiber, more preferably contains 150 parts by mass or less, and even more preferably contains 100 parts by mass or less. This is because other fibers have lower crimp compared to the composite fiber of polybutylene terephthalate and polyethylene terephthalate.

[0021] Examples of the cross-sectional shape of the fibers contained in the above-mentioned (1) and (2) polybutylene terephthalate false-twisted yarns include round cross-section, elliptical cross-section, triangular cross-section, polygonal cross-sections such as square cross-section, hollow cross-section, and the like. Among these, a round cross-section and an elliptical cross-section are preferable, and a round cross-section is more preferable.

[0022] The expansion and contraction elongation rate of the polybutylene terephthalate false-twisted yarn is preferably 40% or more and 70% or less. By the expansion and contraction elongation rate being 70% or less, the occurrence of runs can be reduced. More preferably, it is 60% or less, and even more preferably 55% or less. On the other hand, by the expansion and contraction elongation rate being 40% or more, flexibility can be improved. More preferably, it is 45% or more. Also, the polybutylene terephthalate false-twisted yarn preferably has a higher expansion and contraction elongation rate than other yarns. The expansion and contraction elongation rate can be measured by the method described in the examples below.

[0023] Examples of the false-twisting method for forming the false-twisted yarn include spindle false-twisting, friction disk false-twisting, and belt false-twisting.

[0024] The circular knitted fabric may contain yarns other than the above-mentioned (1) and (2) polybutylene terephthalate false-twisted yarns, that is, other yarns. Examples of other yarns include filament yarns and spun yarns, with filament yarns being preferable and multifilament yarns being more preferable. Examples of filament yarns include yarns processed such as flat yarns (raw silk), false-twisted yarns, and air-jet interlaced yarns. Other yarns are preferably false-twisted yarns and / or composite processed yarns obtained by combining false-twisted yarns with other long fiber yarns, and more preferably false-twisted yarns. Thereby, the cover property of the knitting can be improved.

[0025] As other yarns, polyester filament yarns or composite yarns containing at least polyester filaments are preferable. By using polyester filaments, the Flexibility and shape retention can be improved. 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, hemp, and wool. Examples of the resin component constituting the polyester fiber include polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate. Polyethylene terephthalate and polybutylene terephthalate are preferred, and polyethylene terephthalate is more preferred. Other yarns preferably contain 70% by mass or more of polyester fibers, more preferably 80% by mass or more, still more preferably 90% by mass or more, even more preferably 95% by mass or more, and most preferably 100% by mass. Further, the polyester fiber may contain the above additives. The polyester fiber preferably contains 90% by mass or more of polyester, more preferably 95% by mass or more, and still 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 can facilitate the exhibition of the characteristics of other yarns. On the other hand, considering the content of the polybutylene terephthalate false-twisted yarn, the content of other yarns is preferably 70% by mass or less, more preferably 60% by mass or less, and still more preferably 50% by mass or less.

[0027] It is preferable that the structure on the other side of the circular knitted fabric and / or the intermediate structure between one side and the other side contains 20% by mass or more of other yarns. This can facilitate the exhibition of the characteristics of the other yarns. More preferably, it is 50% by mass or more, still 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. Also, the structure on the other side and / or the intermediate structure may contain polybutylene terephthalate false-twisted yarns. In that case, the content rate of the other yarns in the structure on the other side and / or the intermediate structure may be 80% by mass or less, may be 60% by mass or less, or may be 40% by mass or less.

[0028] When the other yarn is a false-twisted yarn, it is preferable that the elastic elongation rate of the false-twisted yarn is 3% or more and 45% or less, and more preferably 10% or more and 30% or less. When the elastic elongation rate is 3% or more, the covering effect of the stitches by the false-twisted yarn is easily exhibited. When the elastic elongation rate is 45% or less, the texture of the knitted fabric can be improved. The elastic elongation rate can be measured by the method described in the examples below. Examples of the false-twisting method include spindle false-twisting, friction disk false-twisting, and belt false-twisting.

[0029] When the circular knitted fabric contains filament yarns, it is preferable that the total fineness of the filament yarns is 30 dtex or more. When it is 30 dtex or more, the transparency of the circular knitted fabric can be reduced, and the stiffness and firmness can be improved. More preferably, it is 50 dtex or more. On the other hand, when it is 100 dtex or less, the hardness of the knitted fabric can be reduced, and it can be suitably used for shirt fabrics. Therefore, it is preferable that the total fineness of the filament yarns is 100 dtex or less, more preferably 90 dtex or less, and still more preferably 80 dtex or less. Note that yarns with different finenesses within this range may be interwoven.

[0030] The total fineness of the polybutylene terephthalate false-twisted yarn is preferably 30 dtex or more. By being 30 dtex or more, the stiffness and firmness of the circular knitted fabric can be improved. More preferably, it is 50 dtex or more. On the other hand, by being 100 dtex or less, the knitted fabric can be made thinner and easier to lightweight. Therefore, the total fineness of the polybutylene terephthalate false-twisted yarn is preferably 100 dtex or less, more preferably 90 dtex or less, and even more preferably 80 dtex or less.

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

[0032] Examples of the cross-sectional shape of the fibers contained in the other yarn include a round cross-section, an elliptical cross-section, a triangular cross-section, a polygonal cross-section such as a square cross-section, and a hollow cross-section. Among these, a round cross-section and an elliptical cross-section are preferable, and a round cross-section is more preferable.

[0033] The single-filament fineness of the fibers contained in the circular knitted 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. By the single-filament fineness being 1.0 dtex or more, the pilling resistance and snagging resistance of the knitted fabric are improved. On the other hand, by the single-filament fineness being 3.0 dtex or less, the cover property of the knitted stitches is improved and the windproof property is improved.

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

[0035] One side 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 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. In the manufacturing process, the knit loops can be attracted to the welt side, thereby increasing the density of the knit loops per unit area and improving the windproof property. Further, due to the knit-welt structure, the knit loops are easily fixed within the knitted fabric, so that the elongation in the weft (horizontal) direction can be reduced. The ratio of the knit-welt structure is preferably 0.30 or more, more preferably 0.40 or more, still 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. Further, the ratio of the knit-welt structure may be satisfied on both sides, i.e., one side and the other side.

[0036] In this specification, the one side may be the surface on the outer layer side of the circular knitted fabric or the surface on the inner layer side of the circular knitted fabric. When the one side is the surface on the outer layer side of the circular knitted fabric, the surface on the inner layer side of the circular knitted fabric becomes the other side, and when the one side is the surface on the inner layer side of the circular knitted fabric, the surface on the outer layer side of the circular knitted fabric becomes the other side.

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

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

[0039] Preferably, the ratio of the knit-welt structure to the entire structure of the circular knitted fabric is 0.20 or more and 0.80 or less. When the ratio of the knit-welt structure is 0.20 or more, the density of knit loops per unit area can be increased to improve the windproof property. More preferably, it is 0.30 or more, still more preferably 0.50 or more. On the other hand, the ratio of the knit-welt structure may be 0.90 or less, or may be 0.80 or less.

[0040] Next, with reference to Fig. 1(b), the calculation of the ratio of the knit-welt structure to the entire structure of the circular knitted fabric will be described. The structure in Fig. 1(b) is a structure in which knitting yarns form loops on both the front and back sides. (1), (2), (3), (5), and (6) are knit loops, (4) is a welt, and (7) is a tack. That is, the structure in Fig. 1(b) consists of seven loops and welts, including five knit loops, one welt, and one tack. And this structure includes a pair of knit-welt structures (3) and (4), and the number is two. Therefore, the ratio of the knit-welt structure to the entire structure in the structure of Fig. 1(b) is calculated as 2 / 7, which is 0.29. However, when calculating the ratio of the knit-welt structure to the entire structure of the circular knitted fabric, tacks and the like that connect the structure on one side and the structure on the other side shall be counted. Note that the tack (7) constitutes the structure on the other side.

[0041] The knit-welt structure preferably repeatedly exists in the course direction corresponding to the longitudinal direction of the knitted fabric. Thereby, the knit loops are connected skipping one yarn, and can be most densely filled in the course direction to improve the windproof property. Preferably, one side of the circular knitted fabric has this repeating structure. Also, 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 formed by the polybutylene terephthalate false - twisted yarn to the entire structure formed by the polybutylene terephthalate false - twisted yarn is 0.45 or more. Thereby, the function of the knit - welt structure is more likely to be exerted. The ratio is more preferably 0.60 or more, still more preferably 0.80 or more, even more preferably 0.90 or more, and most preferably 1.00. Also, on one side and the other side, the ratio may be satisfied. When calculating the ratio, tacks and the like that connect the structure of one side and the structure of the other side are to be counted.

[0043] In the circular knitted fabric, it is preferable that the welt ratio to the entire structure of the whole fabric is 0.20 or more and 0.55 or less. When the welt ratio is 0.20 or more, when a strong force is applied between the loops, the lateral elongation can be suppressed, and the collapse of the loop structure can be reduced. The combination of such a low - elongation knitted fabric structure and the high crimpability of the polybutylene terephthalate false - twisted yarn can effectively prevent the occurrence of runs from various aspects. The welt ratio is more preferably 0.25 or more. On the other hand, when the welt ratio is 0.55 or less, the number of knit loops can be improved. The welt ratio is more preferably 0.50 or less, and still more preferably 0.40 or less.

[0044] Next, with reference to Fig. 1(a), the calculation of the welt ratio of the entire structure of the circular knitted fabric will be described. In the knitting structure of the welt calico shown in Fig. 1(a), since the basic structure consists of a total of 4 structures including 2 knit loops and 2 welts, the welt ratio is (2 / 4)=0.50. However, when calculating the welt ratio of the entire structure of the circular knitted fabric, tacks and the like that connect the structure of one side and the structure of the other side are to be counted.

[0045] Preferably, the course density on one side is 60 or more and 120 or less (per 2.54 cm). When the course density is 60 or more (per 2.54 cm), the windproof property is improved. More preferably, the course density is 65 or more (per 2.54 cm), still more preferably 80 or more (per 2.54 cm), and even more preferably 90 or more (per 2.54 cm). On the other hand, when the course density is 120 or less (per 2.54 cm), the texture can be improved and the weight can be reduced. More preferably, the course density is 110 or less (per 2.54 cm). It is more preferable that the circular knitted fabric satisfies the course density on one side and the other side, and it is still more preferable that the circular knitted fabric satisfies the course density throughout all layers.

[0046] Preferably, the wale density on one side is 50 or more and 120 or less (per 2.54 cm). When the wale density is 50 or more (per 2.54 cm), the windproof property is improved. More preferably, the wale density is 55 or more (per 2.54 cm), still more preferably 60 or more (per 2.54 cm). On the other hand, when the wale density is 120 or less (per 2.54 cm), the texture can be improved and the weight can be reduced. More preferably, the wale density is 100 or less (per 2.54 cm), and more preferably 80 or less (per 2.54 cm). It is more preferable that the circular knitted fabric satisfies the wale density on one side and the other side, and it is still more preferable that the circular knitted fabric satisfies the wale density throughout all layers.

[0047] In the production of circular knitted fabric, due to the crimp of polybutylene terephthalate false-twisted yarn, it is easy to obtain a high-density knitted fabric, so the needle density of the circular knitting machine does not have to be high. As the circular knitting machine, a double-knit knitting machine with a needle density (gauge) of 24 or more per inch (2.54 cm) on the needle bed and two rows of needle beds is preferred. The knitting machine gauge is preferably 28 to 36 needles / 2.54 cm. When the knitting machine gauge is 36 needles / 2.54 cm or less, the yarn can be thickened and the windproof property can be improved. On the other hand, when the knitting machine gauge is 28 needles / 2.54 cm or more, the yarn can be thinned and the flexibility can be improved.

[0048] On one hand, the loop density per unit area is preferably 4000 or more and 8000 or less. More preferably, it is 5500 or more and 7000 or less. When the loop density is within this range, the windproof property and the running resistance can be improved, and the productivity can also be improved. The loop density per unit area is the product of the number of course rows between 1 inch in length and the number of wale rows between 1 inch in width. It is more preferable that the circular knitted fabric satisfies the loop density on one side and the other side, and it is even more preferable that the loop density is satisfied throughout all layers.

[0049] When producing circular knitted fabric, it is preferable to limit and knit the yarn length per 100 wales (W). Specifically, it is preferable that the average yarn length of all the yarns constituting the circular knitted fabric is 50 mm / 100 W or more and 250 mm / 100 W or less. Thereby, compared with conventional knitted fabrics the elongation in the lengthwise and widthwise directions can be reduced. By controlling the ratio of wales in the knitting structure and the yarn length constituting the knitted fabric, the shape retention and the stiffness 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. By being 50 mm / 100 W or more, it becomes easier to produce stably and knitting defects can be reduced. On the other hand, by being 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 fabric structure, 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 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. By being 100 mm / 100 W or more, it becomes easier to produce stably and knitting defects can be reduced. On the other hand, by being 250 mm / 100 W or less, the elongation of the knitted fabric can be reduced. When a plurality of types and a plurality of 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. By the yarn length ratio being 0.60 or more, the occurrence of curl and runs can be reduced. On the other hand, by the yarn length ratio being 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. By the basis weight being 100 g / m 2 or more, the density of the circular knitted fabric can be improved, the firmness and stiffness 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, by the basis weight being 250 g / m 2 or less, the productivity can be improved. More preferably, it is 230 g / m 2It is as follows. The basis weight can be measured by the method described in the examples below.

[0054] The circular knitted fabric preferably has a thickness of 0.3 mm or more and 1.0 mm or less. By having a thickness of 0.3 mm or more, the windproof property can be improved. More preferably, it is 0.4 mm or more. On the other hand, by having a thickness of 1.0 mm or less, the productivity can be improved. The thickness can be measured by the method described in the examples below. More preferably, it is 0.8 mm or less. The thickness can be measured by the method described in the examples below.

[0055] The circular knitted fabric has an air permeability of 10 cc / cm 2 / sec or more and 40 cc / cm 2 / sec or less. By having an air permeability of 40 cc / cm 2 / sec or less, the windproof property is improved. More preferably, it is 30 cc / cm 2 / sec or less, and even more preferably 25 cc / cm 2 / sec or less. On the other hand, the air permeability may be 15 cc / cm 2 / sec or more, or may be 20 cc / cm 2 / sec or more. The air permeability can be measured by the method described in the examples below.

[0056] The circular knitted fabric preferably has an elongation rate in the transverse direction of 1% or more and 45% or less. By having an elongation rate in the transverse direction of 45% or less, the occurrence of runs can be reduced. Specifically, in the case of a circular knitted fabric made by separately using low-crimp yarns and high-crimp yarns on the front and back sides for knitting, runs (transmission lines) are likely to occur in the longitudinal direction. This is because due to the difference in stretchability between the front and back sides, when a force acts in the transverse direction, the force applied to the low-crimp yarns becomes uneven, causing the fabric structure to collapse, and this propagates in the longitudinal direction to form runs. Therefore, by setting at least the elongation rate in the transverse direction of the knitted fabric to 45% or less, the occurrence of runs can be reduced. Also, this makes it easier to sew. The elongation in the transverse The elongation rate is more preferably 40% or less, still more preferably 35% or less, and even more preferably 30% or less. On the other hand, when the elongation rate in the transverse direction is 1% or more, the texture, tailoring appearance, and flexibility can be improved. The elongation rate in the transverse direction is more preferably 5% or more, still more preferably 10% or more. The elongation rate in the transverse direction can be measured by the method described in the examples below.

[0057] For the circular knitted fabric, the elongation rate in the longitudinal direction is preferably 1% or more and 45% or less. When the elongation rate in the longitudinal direction is 45% or less, the occurrence of runs can be reduced. Also, this makes it easier to sew. The elongation rate in the longitudinal direction is more preferably 40% or less, still more preferably 35% or less, and even more preferably 30% or less. On the other hand, when the elongation rate in the longitudinal direction is 1% or more, the texture, tailoring appearance, and flexibility can be improved. The elongation rate in the longitudinal direction is more preferably 5% or more, still more preferably 10% or more. The elongation rate in the longitudinal direction can be measured by the method described in the examples below.

[0058] In order to suppress the elongation rate in the transverse direction of the circular knitted fabric as low as above, it is preferable to fully develop the crimp of the false-twisted yarn during the dyeing process, create entanglement between the knitting loops made of the thickened yarn, and then apply a stronger heat treatment to the knitted fabric for heat setting. This heat setting is preferably carried out at 180°C or higher for dry heat and 120°C or higher for wet heat, and more preferably at 190 - 210°C for dry heat and 125 - 135°C for wet heat. Specifically, after increasing the crimp through a continuous relaxation process such as a relaxer for the green fabric, a strong heat setting can be performed. Also, in order to suppress the elongation in the transverse direction of the circular knitted fabric and adjust the elongation balance between the longitudinal and transverse directions, it is also preferable to slightly stretch the transverse direction compared to the longitudinal direction and finish the knitted fabric loops to be longer in the transverse direction.

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

[0060] The circular knitted fabric can be used for cold-proof clothing. The cold-proof clothing containing the circular knitted fabric may be worn by a person or may be worn by an animal. When the cold-proof clothing is for human use, it preferably covers at least a part of the feet, hands, abdomen, chest, neck, face, and head, and more preferably covers at least a part of the chest and abdomen. Specific examples of the cold-proof clothing include outerwear, innerwear, sportswear, nightgowns, work clothes, socks, gloves, hats, mufflers, etc. When the cold-proof clothing is for animal use, it can be used, for example, as clothing for pets such as dogs and cats; clothing for livestock such as horses, cows, and sheep; clothing for pet reptiles and amphibians; and clothing for wild animals. Also, its form is not particularly limited. For example, it preferably covers at least a part of the chest, abdomen, front legs, hind legs, neck, and face of the animal, and more preferably covers at least a part of the chest and abdomen.

[0061] The cold-proof clothing may, for example, include the above circular knitted fabric and another knitted fabric layered on the circular knitted fabric, but the knitted fabric preferably consists of the above circular knitted fabric.

Examples

[0062] Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by the following examples, and it is also possible to make modifications within the scope that conforms to the gist of the foregoing and following descriptions, and all of them are included in the technical scope of the present invention.

[0063] <Elongation rate of the yarn (%)> Measured based on JIS-L1013:2010 8.11 Stretchability Method A.

[0064] <Elongation rate of knitted fabric (%)> Measured based on JIS-L1096:2010 8.16 Method B (constant load), with the load applied at 490 cN.

[0065] <Average yarn length of knitted fabric> Based on JIS-L1096:2010 8.8 stitch length, the stitch length was measured. Specifically, for each type of yarn constituting the knitted structure, the measurement interval was set as 100 stitches (100 wales). After loosening the yarn in the measurement interval, the average yarn length of each yarn was calculated by dividing the length of the yarn when the initial load was applied by 100. However, for filament yarns, the initial load specified in JIS L 1013's 5.1 (initial load) was used, and for spun yarns, the initial load specified in JIS L The initial load specified in 6.1 (initial load) of JIS L 1095 was used.

[0066] <Thickness of knitted fabric> Based on JIS-L1096:2010 8.4 Method A's thickness, the thickness of the knitted fabric was measured. The constant pressure under the measurement conditions was set at 23.5 kPa.

[0067] <Areal density of knitted fabric> Based on the mass per unit area in the standard state of JIS-L1096:2010 8.3.2 Method A, the areal density of the knitted fabric was measured.

[0068] <Density of knitted fabric> Based on JIS-L1096:2010 8.6.2 the density of the knitted fabric, the number of courses (per 2.54 cm) and the number of wales (per 2.54 cm) on one side of the knitted fabric were measured. The number of wales and courses refers to the number of wales in a 1-inch horizontal direction and the number of courses in a 1-inch vertical direction in the knitted fabric.

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

[0070] <Total fineness of yarn, number of filaments, single-filament fineness> Based on the fineness (total fineness) A method in JIS L1013 2010, Clause 8.3, the total fineness was measured and converted to decitex (dtex). Also, based on JIS L1013 2010, Clause 8.4, the number of filaments was measured, and the single-filament fineness was determined by total fineness / number of filaments.

[0071] <Wale resistance of knitted fabric> Samples with a size of 5 cm in the warp direction and 10 cm in the weft direction were cut from the knitted fabric, and five samples passing through the weft fabric pattern on the knitting end side were prepared. Next, using a grab method with a tensile testing machine (AUTOGRAPH AG-X series) manufactured by Shimadzu Corporation, the chucks were attached in parallel in the wale direction (warp direction) with a grip interval of 7 mm, and tensile measurement was performed at a tensile speed of 5 cm / min. The type of chuck used was a grab chuck [front 25 mm × 25 mm, rear 25 mm × 50 mm (width × height)]. Starting from the beginning of the tension, the area between the grips was observed, and the stress value when the fabric pattern of the knitted fabric collapsed and a run occurred, specifically the stress value at the first peak of the S-S curve on the chart, was determined. Among the measured values of the five samples, the average value of the stress values at three points excluding the highest and lowest values was taken as the wale resistance (N). Note that runs were likely to occur from the chuck gripping part.

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

[0073] The completed fabric was turned inside out, and continuous scouring was performed according to the following recipe, followed by dyeing and finishing. Scouring recipe: Using a liquid flow dyeing machine NS type manufactured by Nisaka Seisakusho, 1 g / l of Nonisol manufactured by Satoda Kako Co., Ltd., 0.5 g / l of Neocrystal CG1000 manufactured by Nichika Chemical Co., Ltd., and 0.5 g / l of soda ash were used, and the bath temperature was set at 60°C → 80°C → 80°C.

[0074] Dyeing recipe: Using a liquid flow dyeing machine NS type manufactured by Nisaka Seisakusho, at a bath ratio of 1:15, 130°C × 45 minutes, 0.2 g / l of acetic acid, pH = 4, 0.5 g / l of Disper N 700 manufactured by Meisei Chemical Industry Co., Ltd. 0.5 g / l, 0.5 g / l of Neocrystal GC1000 manufactured by Nichika Chemical Co., Ltd., 1.5% owf of SR1800 manufactured by Takamatsu Yushi Co., Ltd., and after dyeing with 0.5% owf of the disperse cationic dye Kayacryl Ligt Blue 4GSL-ED, centrifugal dehydration and drying at 120°C × 3 minutes were performed.

[0075] Next, a finishing agent was applied using Sansstat ES-11, an antistatic agent manufactured by Sanyo Chemical Industries, Ltd., at 1% ows (on the weight of solution). The pickup of the finishing agent was 70%. Thereafter, the final setting was performed under the conditions of 160 °C for 2 minutes using a pin tenter to adjust the properties and obtain the final fabric. In the finishing process, the width was not extended as much as possible to remove wrinkles, and the fabric was finished without stretching in the warp direction.

[0076] (Example 2) In the same manner as in Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ manufactured by Fukuhara Seisakusho) was used to produce a knitted fabric of a mesh reverse pattern consisting of complete weaves F1 to F12 shown in FIG. 3 by rib gauging. At that time, 33 dtex (T), 12-filament (f) polyethylene terephthalate false-twisted yarn (SD) with a round cross-section and 0.3 mass% of titanium oxide fine particles kneaded therein was used at the yarn feed ports F1, F4, F7, and F10. Next, the same false-twisted yarn as in Example 1 was used at the yarn feed ports F2, 3, 5, 6, 8, 9, 11, and 12. The yarn lengths at each yarn feed port were 215 mm / 100W for F1, 4, 7, and 10, and 105 mm / 100W for F2, 3, 5, 6, 8, 9, 11, and 12. The average yarn length of F1 to F12 was 160 mm / 100W. The resulting knitted 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 (4AL manufactured by Fukuhara Seisakusho), a knitted fabric of a mesh reverse pattern consisting of complete weaves F1 to F12 shown in FIG. 4 was produced by rib gauging. At that time, the same false-twisted yarn as in Example 2 was used at the yarn feed ports F1, F4, F7, and F10. Next, the same false-twisted yarn as in Example 1 was used at the yarn feed ports F2, 3, 5, 6, 8, 9, 11, and 12. The yarn lengths at each yarn feed port were 205 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 of F1 to F12 was 152 mm / 100W. The resulting knitted fabric was dyed and finished in the same manner as in Example 1.

[0078] (Example 4) In the same manner as in Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ manufactured by Fukuhara Seiki Seisakusho) was used to produce and knit a green fabric of a mesh reverse pattern consisting of complete weaves F1 to F12 shown in FIG. 5 by rib gauging. At that time, the same false-twisted yarns as in Example 2 were used for the yarn supply ports F1, F4, F7, and F10. Next, for the yarn supply ports F2, 3, 5, 6, 8, 9, 11, and 12, a polybutylene terephthalate false-twisted yarn, which is a false-twisted yarn with a round cross-section of 56T and 24f, was used. The yarn lengths of each yarn supply port were 215 mm / 100W for F1, 4, 7, 10, and 105 mm / 100W for F2, 3, 5, 6, 8, 9, 11, 12. The average yarn length of F1 to F12 was 160 mm / 100W. The completed green fabric was dyed and finished in the same manner as in Example 1.

[0079] (Example 5) In the same manner as in Example 1, a 33-inch, 36-gauge double circular knitting machine (LPJ manufactured by Fukuhara Seiki Seisakusho) was used to produce and knit a green fabric of a cross miss interlock pattern consisting of complete weaves F1 to F6 shown in FIG. 6 by rib gauging. At that time, a polyethylene terephthalate false-twisted yarn (SD) with a round cross-section of 66 dtex(T) and 72 filaments (f) in which titanium oxide fine particles were kneaded at 0.3 mass% was used for the yarn supply ports F1, 2, and 4. Next, the same false-twisted yarns as the yarns used at the yarn supply port F2 etc. in Example 1 were used for the yarn supply ports F3, 5, and 6. The yarn lengths of each yarn supply port were 115 mm / 100W for F3 and 6, and 210 mm / 100W for F1, 2, 4, and 5. The average yarn length of F1 to F12 was 162 mm / 100W. The completed green 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 produce a mock roddy-patterned green fabric consisting of the complete weaves F1 to F6 shown in FIG. 7 by rib gauging. At that time, the same false-twisted yarns as those used at the yarn feed ports F1, F3, F4, and F6 of Example 5 were used at the yarn feed ports F1, F3, F4, and F6. Next, the same false-twisted yarns as those used at the yarn feed ports F2, etc. of Example 1 were used at the yarn feed ports F2 and 5. The yarn lengths at each yarn feed port were 210 mm / 100W for F1 and 4, 110 mm / 100W for F2 and 5, and 115 mm / 100W for F3 and 6. The average yarn length of F1 to 6 was 145 mm / 100W. The resulting green 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 produce a reversible-patterned green fabric consisting of the complete weaves F1 to F8 shown in FIG. 8 by rib gauging. At that time, the same false-twisted yarns as those used at the yarn feed ports F1, etc. of Example 2 were used at the yarn feed ports F1 and F5. Further, the same false-twisted yarns as those used at the yarn feed ports F1, etc. of Example 5 were used at the yarn feed ports F4, 6, and 8. Further, the same false-twisted yarns as those used at the yarn feed ports F2, etc. of Example 1 were used at the yarn feed ports F2, 3, and 7. Next, the yarn lengths at each yarn feed port were 115 mm / 100W for F1 and 5, 105 mm / 100W for F2, 3, 6, and 7, and 195 mm / 100W for F4 and 8. The average yarn length of F1 to 8 was 138 mm / 100W. The resulting green fabric was dyed and finished in the same manner as in Example 1.

[0082] (Example 8) In the same manner as in Example 1, using a 33-inch, 36-gauge double circular knitting machine (LPJ manufactured by Fukuhara Seiki Co., Ltd.), a mock roddy pattern fabric consisting of the complete weaves F1 to F6 shown in FIG. 9 was knitted by rib gauging. At that time, the same false-twisted yarn as that used at the yarn supply ports F1, F4 in Example 5 was used. Next, the same false-twisted yarn as that used at the yarn supply ports F2, 3, 5, 6 in Example 1 was used for the yarn supply ports F2, 3, 5, 6. The yarn lengths at each yarn supply port were 210 mm / 100W for F1, 4 and 110 mm / 100W for F2, 3, 5, 6. The average yarn length of F1 to F6 was 160 mm / 100W. The completed fabric was dyed and finished in the same manner as in Example 1.

[0083] (Example 9) In the same manner as in Example 1, using a 33-inch, 36-gauge double circular knitting machine (LPJ manufactured by Fukuhara Seiki Co., Ltd.), a mesh reverse pattern fabric consisting of the complete weaves F1 to F12 shown in FIG. 10 was knitted by rib gauging. At that time, the same false-twisted yarn as that used at the yarn supply ports F1, F4, F7, F10 in Example 1 was used. Next, for the yarn supply ports F2, 3, 5, 6, 8, 9, 11, 12, a false-twisted yarn of 33T24f which is a round cross-section yarn of a false-twisted yarn made of a conjugate fiber of polybutylene terephthalate and polyethylene terephthalate, and a mixed fiber yarn of a cation-dyeable polyester filament false-twisted yarn 33 dtex (T), 36 filaments (f) 66 (T), 60 filaments (f) were used. The mixed fiber method was to perform air entanglement treatment on each yarn using an interlace nozzle. The yarn lengths at each feeder were 215 mm / 100W for F1, 4, 7, 10 and 100 mm / 100W for F2, 3, 5, 6, 8, 9, 11, 12. The average yarn length of F1 to F12 was 158 mm / 100W. The completed fabric was dyed and finished in the same manner as in Example 1.

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

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

[0086] The detailed configurations of these knitted fabrics and the respective evaluation results 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 had a ratio of the knit-welt structure on one side within a predetermined range and contained a predetermined amount of polybutylene terephthalate false-twisted yarn, so they exhibited excellent wind resistance. On the other hand, Comparative Example 1 did not contain polybutylene terephthalate false-twisted yarn, so its wind resistance was poor. Also, Comparative Example 2 did not have a knit-welt structure, so its wind resistance was poor.

Claims

1. A double-knit circular knitted fabric, wherein the circular knitted fabric contains 20% by mass or more of a 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 the one surface is 0.25 or more and 1.00 or less, and the circular knitted fabric for wind prevention is characterized by this.

2. The circular knitted fabric for wind prevention according to Claim 1, wherein the polybutylene terephthalate false-twisted yarn is at least one false-twisted yarn selected from the group consisting of the following (1) and the following (2). (1) A false-twisted yarn containing polybutylene terephthalate fibers (2) A false-twisted yarn containing a composite fiber of polybutylene terephthalate and polyethylene terephthalate

3. The circular knitted fabric for wind prevention according to Claim 1 or 2, wherein the course density on the one surface is 60 (per 2.54 cm) or more and 120 (per 2.54 cm) or less.

4. The circular knitted fabric for wind prevention according to any one of Claims 1 to 3, wherein the wale density on the one surface is 50 (per 2.54 cm) or more and 120 (per 2.54 cm) or less.

5. The basis weight is 100 g / m ２ or more and 250 g / m ２ or less. The round knitted fabric for wind prevention according to any one of claims 1 to 4.

6. The circular knitted fabric for wind prevention according to any one of Claims 1 to 5, wherein the ratio of the knit-welt structure constituted by the polybutylene terephthalate false-twisted yarn to the entire structure constituted by the polybutylene terephthalate false-twisted yarn is 0.45 or more.

7. The circular knitted fabric for wind prevention according to any one of Claims 1 to 6, wherein the stretch elongation rate of the polybutylene terephthalate false-twisted yarn is 40% or more and 70% or less.

8. The air permeability is 10 cc / cm ２ / second or more and 40 cc / cm ２ / second or less. The round knitted fabric for wind prevention according to any one of claims 1 to 7.

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