JP2010084240A - Weft knitted fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weft knitted fabric not only having excellent moisture-absorbing and releasing properties, but also having see-through-preventing effects and ultraviolet-shielding effects, and hardly reducing these effects even after repeated laundry. <P>SOLUTION: The weft knitted fabric is obtained by using a 40-120 count spun yarn containing ≥60 mass% solvent-spun cellulose fiber having 0.5-1.5 dtex single fiber fineness based on the whole mass of the spun yarn. The solvent-spun cellulose fiber contains 0.5-1.5 mass% titanium oxide having 0.1-1.0 mm average primary particle diameter based on the whole mass of the fiber. The weft knitted fabric is knitted by 24-46 gauge needle density. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a weft knitted fabric using solvent-spun cellulose fibers containing titanium oxide.

  Conventionally, weft knitted fabrics using cotton or solvent-spun cellulose fibers are known as weft knitted fabrics suitable for underwear. This knitted fabric is preferable because it has a good texture and is excellent in moisture absorption and moisture release during wearing.

  On the other hand, in order to apply to underwear, it is preferable that the knitted fabric is hard to see through, and it is known that a desired see-through preventing effect can be obtained by adjusting the refractive index of light in the knitted fabric. However, when fibers such as cotton and solvent-spun cellulose fibers are used, it is difficult to adjust the refractive index suitable for obtaining a see-through preventing effect in the knitted fabric. It is common to adopt means such as increasing the thickness or density, or using thick yarn. However, when such a means is adopted, not only the knitted fabric becomes heavy, but also a feeling of stuffiness increases and a feeling of fit becomes difficult to obtain. Furthermore, although there is an attempt to improve the knitted fabric's sheer prevention effect by incorporating a predetermined process into the finishing process, there remains a problem that the effect decreases when washing is repeated.

Therefore, there is an attempt to obtain a desired see-through preventing effect by knitting synthetic fibers. For example, Patent Document 1 discloses a composite fabric in which a polyester-based composite yarn that expresses three-dimensional crimps and a purified cellulose are knitted and woven. In this technique, by twisting the polyester-based composite yarn in a sweet to medium twist region, it is possible to obtain an appropriate stretch property and a flat feeling without a wrinkle feeling in addition to the sheer prevention effect in the fabric.
JP 2003-113554 A

  Generally, it is considered that the above-mentioned composite fabric may be applied to the underwear because the underwear is required to have an appropriate stretch property that can follow the movement of the body. However, if synthetic fibers are used, the hygroscopic property of the knitted fabric is improved. Along with the reduction, there is a problem that the wearing comfort of the underwear is greatly reduced.

  Furthermore, in recent years, the number of scenes in which an underwear is worn as an outer sensation has increased, and in addition to the see-through effect, the ability to efficiently shield ultraviolet rays has been required. However, the composite fabric has not been studied at all in this regard.

  The present invention eliminates the disadvantages of the prior art as described above, has excellent moisture absorption and release properties, and has an effect of preventing see-through and an ultraviolet shielding effect, and it is difficult to reduce those effects even after repeated washing. It is an object of the present invention to provide a weft knitted fabric having excellent characteristics that have not existed before.

  As a result of diligent research, the inventor has made the solvent-spun cellulose fiber contain a specific amount of titanium oxide, and at the same time, limits the knitted fabric density and the thickness of the spun yarn constituting the knitted fabric to a specific range. As a result, the present invention was achieved.

  That is, the present invention uses a 40-120th spun yarn containing 60% by mass or more of solvent-spun cellulose fiber having a single yarn fineness of 0.5-1.5 dtex, and the solvent-spun cellulose fiber. Contains 0.5 to 1.5% by mass of titanium oxide having an average primary particle size of 0.1 to 1.0 mm based on the total mass of the fiber, and is knitted with a needle density of 24 to 46 gauge. The knitted fabric is used as a gist, and in particular, the solvent-spun cellulose fiber includes a fibrillation-preventing process as a preferable embodiment. And as a use of a weft knitted fabric, the aspect applied to underwear is included.

  According to the present invention, it is possible to provide a weft knitted fabric that is excellent in moisture absorption / release properties, has a see-through preventing effect and an ultraviolet shielding effect, and is difficult to reduce these effects even after repeated washing. In particular, in the present invention, from the viewpoint of quality, it is preferable to use solvent-spun cellulose fibers that have been processed to prevent fibrillation.

  Hereinafter, the present invention will be described in detail.

  In the weft knitted fabric of the present invention, solvent-spun cellulose fibers are used. The solvent-spun cellulose fiber is a fiber obtained by using pulp as a raw material, dissolving in a predetermined solvent, filtering, and then dry spinning or wet spinning. As the solvent, for example, N-methylmorpholine-N-oxide, dimethyl sulfoxide, N-methylpiperidine-N-oxide, dimethylacetamide and the like are preferably used.

  In the present invention, solvent-spun cellulose fibers having a single yarn fineness of 0.5 to 1.5 dtex are used. If the single yarn fineness is less than 0.5 dtex, fiberization becomes extremely difficult, while if it exceeds 1.5 dtex, the texture of the knitted fabric becomes hard.

  In the present invention, such a solvent-spun cellulose fiber is not used as it is to obtain a knitted fabric, but once spun yarn is used, it is used as a desired knitted fabric. At this time, the spun yarn needs to contain 60% by mass or more of the solvent-spun cellulose fiber with respect to the total mass of the spun yarn. As will be described later, since the solvent-spun cellulose fiber used in the present invention contains a specific amount of titanium oxide, when the solvent-spun cellulose fiber content contained in the spun yarn is less than 60% by mass, This is because effects such as a see-through preventing effect and an ultraviolet shielding effect described later cannot be imparted to the ground.

  The thickness of the spun yarn needs to be 40 to 120 in English. If the thickness is thicker than 40th, the thickness or mass of the knitted fabric increases, and the use may be limited. On the other hand, if the thickness is thinner than 120th, the strength of the knitted fabric decreases as the yarn strength decreases. In practice, problems may occur. In the present invention, from the viewpoint of maximizing the effects of the invention in addition to production lot management, it is preferable to employ any of 40, 50, and 60 counts as the thickness of the spun yarn.

  In the present invention, by using the solvent-spun cellulose fiber in this way, it is possible to make the knitted fabric excellent in moisture absorption and desorption, and as a result, wearing comfort is obtained when it is made into clothes.

  In addition to this, the knitted fabric of the present invention also has effects such as a see-through preventing effect and an ultraviolet shielding effect. In the present invention, in order to obtain such an effect, the solvent-spun cellulose fiber contains titanium oxide.

  The average primary particle diameter of titanium oxide needs to be 0.1 to 1.0 mm. When the average primary particle diameter is less than 0.1 mm, it is impossible to impart sufficient see-through preventing effect and ultraviolet shielding effect to the knitted fabric. On the other hand, if it exceeds 1.0 mm, the fiber strength is significantly reduced, and the fiber may be cut during the spinning process. Moreover, as content of the titanium oxide with respect to the fiber total mass, it is necessary to set it as 0.5-1.5 mass%. When the content is less than 0.5% by mass, sufficient knitting prevention effect and ultraviolet shielding effect cannot be imparted to the knitted fabric, while when it exceeds 1.5% by mass, the fiber strength is remarkably reduced, and the spinning process In some cases, the fibers may break. Titanium oxide is generally blended into the fiber at the spinning stage.

  Here, with respect to the see-through prevention effect, the knitted fabric is backed with white and black, and the reflected light is measured by applying light to each, and the ratio of the two measured values is obtained. You can know the degree. As a standard of the see-through preventing effect, it is preferably 85% or more, and more preferably 90% or more.

  On the other hand, the ultraviolet ray shielding effect is measured by measuring the transmittance of ultraviolet rays irradiated to the knitted fabric using a spectrophotometer (Shimadzu UV-3100PC) (measurement wavelength region: 290 to 400 nm). I can know. As a standard of the ultraviolet shielding effect, it is preferably 90% or more, and more preferably 95% or more.

  In the present invention, the means for incorporating the titanium oxide into the fiber is employed in this way, so that it is difficult to reduce both effects even if washing is repeated. The washing durability of both effects is evaluated by measuring both effects on a knitted fabric after washing 30 times according to JIS L0217 (Method 103) and comparing it with before washing.

  The knitted fabric of the present invention can be obtained by forming the solvent-spun cellulose fiber as a spun yarn and knitting it. In the present invention, known means can be employed as both the spinning means and the knitting means. Specifically, a means using a ring spinning machine can be adopted as the spinning means, and a means using a commercially available circular knitting machine can be adopted as the knitting means.

  However, in this invention, it is necessary to employ | adopt the range of 24-46 gauge as a needle density of a knitting machine, Preferably 28-36 gauge is employ | adopted. This is because when the needle density is less than 24 gauge, the knitted fabric density becomes coarse and the sense of sheer increases. On the other hand, when the needle density exceeds 46 gauge, not only knitting becomes difficult, but also the knitted fabric strength is adversely affected. It is because it may affect.

  In addition, the knitted fabric structure is not particularly limited, but bare tentacles are preferable from the viewpoint of application development.

  In the knitted fabric of the present invention, solvent-spun cellulose fibers are used as described above. In general, when a knitted fabric using solvent-spun cellulose fibers is turned into a garment and washed repeatedly, the garment surface may appear whitish. This is not limited to solvent-spun cellulose fibers, and is a phenomenon generally observed when cellulosic fibers are used, and is called a fibrillation phenomenon. It is caused by fiber fluff. The fibrillation phenomenon not only impairs the appearance of the clothes but also adversely affects the texture. Therefore, in the present invention, the knitted fabric finally obtained is preferably a fibrillation-prevented finish. Examples of the fibrillation prevention process include a means for preventing fibrillation of the fiber itself and a means for preventing fibrillation of the knitted fabric after knitting. However, when the knitted fabric is processed, the strength and abrasion strength of the knitted fabric are increased. The fibers themselves are preferably processed because there is a concern that they may be greatly reduced. In this case, the fiber may be processed at the same time as the spinning, or may be processed after obtaining the fiber. However, in order to obtain a higher fibrillation preventing effect, the obtained fiber is preferably processed.

  Specifically, a solvent-spun cellulose obtained using an aqueous solution containing at least one compound selected from compounds having a chlorohydrin group or a glycidyl group, a compound exhibiting alkalinity, and a reaction accelerator comprising a neutral salt Process the fiber. A package dyeing machine can be used as the processing equipment. The processing time is generally preferably 10 to 90 minutes, although it depends on conditions such as the input amount of fiber, the apparatus to be used, and the rotation speed of raw cotton. If the treatment time is less than 10 minutes, the desired effect of preventing fibrillation tends not to be obtained. On the other hand, if the treatment time exceeds 90 minutes, not only the effect of preventing further fibrillation cannot be expected, but also the cost is disadvantageous. There is a tendency and neither is preferable. As processing temperature, 40 degreeC or more is preferable and 60-100 degreeC is more preferable. When the temperature is lower than 40 ° C., the treatment time becomes longer as the reaction rate becomes slower, which tends to be disadvantageous in terms of cost. On the other hand, when the temperature exceeds 100 ° C., uneven reaction tends to occur. Yes, neither is preferred.

  In order to evaluate the effect of preventing fibrillation, the knitted fabric is washed 30 times based on JIS L 0217 (Method 103), and then the surface of the knitted fabric is enlarged with an electron microscope and visually evaluated.

  The knitted fabric of the present invention is not particularly limited as long as it is used in the clothing field, but it can be preferably applied particularly to underwear. For this reason, the knitted fabric of the present invention is preferably excellent in abrasion strength, bursting strength and anti-pilling property in addition to the above.

  Specifically, regarding the wear strength, the wear strength measured by the method described in JIS L1096 (friction by Martindale tester: 9 KPa) is preferably 6000 times or more. When the wear strength is less than 6000 times, the knitted fabric is rarely damaged due to rubbing and wear when the garment is worn, which is not preferable.

  Regarding the bursting strength of the knitted fabric, it is preferable that the bursting strength is measured five times in accordance with JIS L 1098: 1999 (Murlen type A method, using low pressure rubber), and the minimum value is 300 KPa or more. If the bursting strength is less than 300 KPa, the knitted fabric is rarely damaged, which is not preferable.

  And about the anti-pilling property of a knitted fabric, it is preferable that the pilling grade determination when it measures for 5 hours by JISL1076 ICI method (A method) is 3rd grade or more, and it is more preferable that it is 4th grade or more. When the anti-pilling property is less than the third grade, the appearance quality tends to be deteriorated as it is used for clothes, which is not preferable.

  Next, the present invention will be specifically described with reference to examples.

  A solvent-spun cellulose fiber having a single yarn fineness of 1.3 dtex containing 0.8% by mass of titanium oxide having an average primary particle size of 0.4 mm was processed to prevent fibrillation in a raw cotton state. And using this fiber, the sliver (effective fiber length 34-38mm) was produced by the normal process, and the roving was obtained through the roving process. The obtained roving was put on a ring spinning machine and spun with a twisting factor of 3.6 to obtain a spun yarn with an English count of 50.

Next, the obtained spun yarn and polyurethane elastic fiber 22dtex1f were put on a bear tentacle circular knitting machine having a hook diameter of 84 cm, a needle density of 28 gauge, a total number of needles of 2,976, and a number of mouths of 102. Knitted weft knitted fabric. Thereafter, this was finished and processed in the order of pre-setting, alkali treatment, scouring / relaxation, and final setting to obtain a weft knitted fabric having a width of 155 cm, a basis weight of 155 g / m ² and a density of 66 course / 44 wales.

  The sheer prevention effect and ultraviolet shielding effect of the obtained knitted fabric were measured by the means described above, and were 91.6% and 90.7%, respectively. And about the knitted fabric after washing 30 times based on JIS L0217 (103 method), since the said effect was 91.0% and 90.3%, respectively, the knitted fabric of this invention is washing durability. It was confirmed that it was excellent.

  Further, when the fibrillation phenomenon on the surface of the knitted fabric was observed by the above-mentioned means, it was confirmed that the effect of preventing fibrillation was generally good because only a slight amount was observed.

  Furthermore, when the abrasion strength, bursting strength, and anti-pilling property of the knitted fabric were measured by the above-mentioned means, they were 10,000 times, 315 KPa, and grade 3, respectively.

For comparison, the above-described steps are performed except that a solvent-spun cellulose fiber not containing titanium oxide is used in place of the solvent-spun cellulose fiber containing titanium oxide, and a step of adding an ultraviolet absorber to the knitted fabric in the finishing process is added. A knitted fabric was obtained in the same manner as the knitted fabric. It was 91.2% and 91.4%, respectively when the transparency prevention effect and ultraviolet shielding effect of the obtained knitted fabric were measured in the same manner. However, the effects after 30 washes based on JIS L0217 (Method 103) were 78.3% and 79.3%, respectively, so that it was confirmed that they did not have washing durability.

Claims (3)

  40 to 120th spun yarn containing 60% by mass or more of solvent-spun cellulose fiber having a single yarn fineness of 0.5 to 1.5 dtex is used, and the solvent-spun cellulose fiber has an average primary particle size of 0. A weft knitted fabric containing 0.5 to 1.5 mass% of titanium oxide having a thickness of 1 to 1.0 mm based on the total mass of the fiber and knitted with a needle density of 24 to 46 gauge.   The weft knitted fabric according to claim 1, wherein the solvent-spun cellulose fiber is processed to prevent fibrillation. The underwear which uses the weft knitted fabric of Claim 1 or 2.