JP5144193B2 - Knitted fabric - Google Patents

Description

  The present invention relates to a knitted fabric using solvent-spun cellulose fibers.

  Conventionally, solvent-spun cellulose fibers are known. Solvent-spun cellulose fiber is a type of regenerated fiber, but because of the small number of cellulose molecules that are cut during the manufacturing process, it has higher wet and dry strength and less fiber shrinkage compared to general viscose rayon and high wet modulus rayon. . Solvent-spun cellulose fiber is prepared by dissolving pulp in a solvent such as N-methylmorpholine-N-oxide, dimethyl sulfoxide, N-methylpiperidine-N-oxide, dimethylacetamide, and removing impurities by filtration. It can be obtained by dry or wet spinning.

  Various woven and knitted fabrics have been proposed using such solvent-spun cellulose fibers. Woven and knitted fabrics made from solvent-spun cellulose fibers are generally excellent in softness and touch feeling, and as a technology to make them more obvious, peach skin tone is obtained by rubbing and spreading the woven or knitted fabric in a wet state. Means for imparting the texture is known. This is due to the fact that solvent-spun cellulose fibers can be fibrillated by friction / distribution treatment, while fibrillation of the fibers tends to induce pilling and is a means for preventing fibrillation. Has also been proposed.

As a means for preventing fibrillation of solvent-spun cellulose fibers, for example, a means for immersing and stirring using a solution containing a specific compound and a catalyst as a target for raw cotton (see, for example, Patent Documents 1 and 2) However, as a target for woven and knitted fabrics, means for padding using a solution containing a specific compound (for example, see Patent Documents 3 and 4) and the like are known.
JP 09-158050 A JP-A-10-158921 JP 2000-27078 A JP 2001-11777 A

  The fiber fibrillation prevention means is basically a process of covering the fiber surface with a specific compound, which can prevent the fiber from being split and thus improve the anti-pilling property of the woven or knitted fabric. However, since the flexibility of the fiber tends to be reduced by the processing, it tends to be difficult to absorb an instantaneous external stress such as rubbing, pulling, tearing, and collision, and the wear strength and burst strength are reduced. There is a tendency.

  Abrasion strength and bursting strength are basic functions required for woven and knitted fabrics. Therefore, when these functions become poor, there is a problem that the application is necessarily limited.

  The present invention solves the above-mentioned drawbacks of the prior art, and it is a technical problem to provide a knitted fabric that is excellent in anti-pilling properties and at the same time has excellent abrasion strength and bursting strength. .

  As a result of diligent research to solve the above problems, the present inventors have found that the above problems can be solved by using a spun yarn having a small amount of fluff comprising solvent-spun cellulose fibers processed to prevent fibrillation. The invention has been reached.

That is, the gist of the present invention is a knitted fabric comprising a solvent-spun cellulose fiber having a resin film formed on the surface of the fiber by an anti-fibrillation process and using a spun yarn having an average fluff index of 3 mm or more and 40 or less. To do.

  The knitted fabric of the present invention is excellent in anti-pilling property and at the same time, excellent in abrasion strength and bursting strength. Further, the knitted fabric of the present invention can be widely used as general clothing, and is particularly suitable for use in underwear.

  Hereinafter, the present invention will be described in detail.

  The present invention is a knitted fabric using solvent-spun cellulose fibers. Specifically, it is formed using a spun yarn containing solvent-spun cellulose fibers, and the solvent-spun cellulose fibers are processed to prevent fibrillation.

  As the solvent-spun cellulose fiber in the present invention, those having a single yarn fineness of 0.1 to 5.0 dtex and a fiber length of 10 to 60 mm are preferably used.

  In addition, as the spun yarn in the present invention, a yarn having a thickness of 40 to 120 is preferably used. If the thickness of the spun yarn is thicker than 40th, it is not preferable because the knitted fabric becomes thick and the use may be limited. On the other hand, if the spun yarn is thinner than 120th, the tensile strength of the spun yarn may be reduced. Therefore, it is not preferable. The spun yarn in the present invention may contain fibers other than solvent-spun cellulose fibers as necessary, and any fibers can be used regardless of whether they are long or short fibers. For example, polyester, polylactic acid, nylon, polyurethane, acrylic, acetate, viscose rayon, cupra, cotton, wool and the like can be used. However, considering the texture of the resulting knitted fabric, the solvent-spun cellulose fiber is preferably contained in the spun yarn at 50% by mass or more, more preferably 90% or more.

  Further, in the spun yarn of the present invention, in addition to containing solvent-spun cellulose fibers, the solvent-spun cellulose fibers need to be processed to prevent fibrillation. Of course, the spun yarn in the present invention only needs to contain solvent-spun cellulose fiber that has undergone anti-fibrillation processing as the spun yarn, and the timing for performing anti-fibrillation processing is the first step after obtaining the spun yarn. If it is earlier, it can be done at any time. Therefore, for example, solvent-spun cellulose fibers in a raw cotton state before being put into the spinning process may be processed, or may be processed after the fine spinning process which is the final process of the spinning process.

  The spun yarn in the present invention contains solvent-spun cellulose fibers that have been processed to prevent fibrillation as described above. However, with this alone, a knitted fabric having only excellent anti-pilling properties can be obtained, and a knitted fabric having excellent wear strength and bursting strength cannot be obtained. Then, the present inventors proceeded with investigation focusing on the fact that anti-fibrillation processing is a kind of resin processing, and a resin film is formed on the surface of the fiber by anti-fibrillation processing, which is a type of resin processing. Therefore, it came to the idea that this resin film could be used as a means to protect the knitted fabric from the momentary stress received from the outside. As a result of research on the best yarn structure that can utilize this resin coating, it was surprisingly found that the resin coating can be utilized by reducing the fluff on the surface of the spun yarn.

  That is, the spun yarn in the present invention not only contains solvent-spun cellulose fibers processed to prevent fibrillation, but it is important to reduce the surface fluff. Specifically, the average fluff index of 3 mm or more is 40 or less. It is important to set When the average fluff index of 3 mm or more exceeds 40, the abrasion strength and bursting strength of the knitted fabric are lowered. Setting the average fluff index low is advantageous for improving the strength of the knitted fabric, but as the fluff of the spun yarn decreases, the texture of the knitted fabric tends to paper-like. 40 is preferred.

  As a method for measuring the average fluff index, the method described in JIS L1095 9.22.2B method is adopted. Specifically, a parallel light beam in one direction perpendicular to the spun yarn is applied, and an image of the fluff is projected on a shielding plate installed on the side opposite to the light source when viewed from the spun yarn. Corresponds to the fluff index. For measurement, an F-INDEX tester (manufactured by Shikishima Boseki Co., Ltd.) is used to measure 30 times with a sample length of 10 m, and the average value is taken as the average fluff index.

  The knitted fabric of the present invention is made using such a spun yarn, and has excellent anti-pilling properties and at the same time excellent wear resistance and bursting strength. The knitted fabric of the present invention may contain yarns other than the spun yarn, but as the content of the spun yarn decreases, the effects unique to the present invention tend to decrease. The spun yarn is preferably contained in an amount of 50% by mass or more, more preferably 90% or more.

  The knitted fabric of the present invention exhibits an excellent function by having the above-described configuration.

  Specifically, the excellent anti-pilling property is an effect exhibited by using solvent-spun cellulose fibers that have been processed to prevent fibrillation. As a method for measuring anti-pilling properties, the method described in JIS L1076 8.1A method (method using an ICI type tester) is adopted. Specifically, the knitted fabric is put into an ICI type testing machine for 5 hours and graded according to JISL1076 9.2, and this value is regarded as anti-pilling property in the present invention.

  The knitted fabric of the present invention preferably has a third or higher grade as anti-pilling property, and more preferably has a fourth or higher grade. If the anti-pilling property is lower than the third grade, it is not preferable because pilling appears on the surface of the knitted fabric as it is repeatedly worn and washed as a garment, and the garment tends to be uncomfortable and functional.

  Further, the excellent abrasion strength and bursting strength are synergistic effects produced by using solvent-spun cellulose fibers that have been processed to prevent fibrillation and that the surface of the spun yarn is confined within a specific range. The reason why such a synergistic effect is exhibited is not clear. Probably, in the process of fluffing the surface of the spun yarn, it is presumed that some change occurred in the stiffness of the spun yarn, which affected the strength of the knitted fabric.

  As a method for measuring the wear strength, the method described in JIS L1096 8.17.5E method (Martindale method) is adopted. The pressing load is 9 kPa. The knitted fabric of the present invention has a wear strength of preferably 6000 times or more, more preferably 10,000 times or more. When the wear strength is less than 6000 times, it is not preferable because misalignment or fluff may occur on the surface of the knitted fabric while being repeatedly worn and washed as clothes.

  Furthermore, as a method for measuring the bursting strength, the method described in JIS L1018 8.17.1A method (Mullen type method) is adopted. Low pressure rubber is used as the rubber film. The knitted fabric of the present invention preferably has a bursting strength of 300 kPa or more. When the bursting strength is less than 300 kPa, the surface of the knitted fabric may be misaligned or cracked while being repeatedly worn and washed as clothes, which is not preferable.

  Next, an example for obtaining the knitted fabric of the present invention will be described.

  In the knitted fabric of the present invention, basically, a process for preventing fibrillation of solvent-spun cellulose fibers, a process for reducing the fluff of the spun yarn, and a process of knitting using the spun yarn are performed in this order. Can be easily obtained.

  First, as a process for preventing fibrillation of solvent-spun cellulose fibers, for example, using a package dyeing machine as a processing apparatus, solvent spinning in a treatment bath containing a compound having a chlorohydrin group or a glycidyl group and a reaction accelerator is used. What is necessary is just to immerse and stir a cellulose fiber. Specific processing conditions vary depending on the input amount of fiber, the apparatus used, the stirring speed, and the like, but the processing time is preferably 10 to 90 minutes. When the processing time is 10 minutes or less, it is not preferable because it is difficult to obtain a sufficient fibrillation prevention effect. On the other hand, when the processing time exceeds 90 minutes, the crosslinking reaction with the fiber molecules is almost completed, so that further fibrillation is achieved. Since the prevention effect is difficult to expect, it is not preferable. Moreover, as processing temperature, 40-100 degreeC is preferable and 60-100 degreeC is more preferable. If the processing temperature is less than 40 ° C., the crosslinking reaction rate tends to be slow, which is not preferable. On the other hand, if the processing temperature exceeds 100 ° C., uneven reaction tends to occur, which is not preferable.

  The spun yarn used in the present invention may contain fibers other than solvent-spun cellulose fibers as necessary. In this case, as fibers other than solvent-spun cellulose fibers, when fibers that are likely to be disturbed in physical properties or dyeability are used by the fibrillation prevention processing, the fibers are not processed after spinning. It is preferable to process only the solvent-spun cellulose fiber raw cotton and to mix both fibers in the subsequent spinning step.

  In addition, as a process for reducing the fluff of the spun yarn, a compact spinning system is preferably employed. The compact spinning system is a kind of ring spinning method, and is a spinning method that provides an air suction type convergence mechanism in the transition region from draft to twisting. According to this fine spinning method, the degree of parallelism and accumulation of fibers can be improved, so that a dense spun yarn with less fluff can be formed. As spinning conditions, conditions generally employed in compact spinning may be adopted.

  And as a process knitting using a spun yarn, what is necessary is just to knit using a well-known warp knitting machine. That is, knitting is performed using a tricot knitting machine and a Russell knitting machine in the case of warp knitting, and a circular knitting machine, a full fashion knitting machine, a sock knitting machine and the like in the case of weft knitting. As specific knitting conditions, the needle density is preferably 28 to 46 gauge. When the needle density is less than 28 gauge, the fiber density of the knitted fabric is reduced, and it is not preferable because it tends to lose its shape when it is made into clothes. On the other hand, when it exceeds 46 gauge, extremely thin spun yarn must be used. This is not preferable because it may hinder knitting. In addition, basically any structure can be adopted as the knitted fabric structure, but a tengu structure is preferable from the viewpoint of versatility.

  The knitted fabric of the present invention can be easily obtained by the above means, but may be dyed if necessary after knitting. As an example of the dyeing process, there is a means for carrying out a preset, low-concentration alkali treatment, scouring / relaxation, liquid dyeing, finishing set and incidental treatment in this order. Ancillary treatment is a process for changing the color developability and texture of the knitted fabric or imparting functionality to the knitted fabric. For example, fixing agent treatment, softener treatment, antibacterial agent treatment, antistatic agent Treatment, water-absorbing agent treatment, wrinkle-proofing agent processing and the like.

  The knitted fabric of the present invention thus obtained has an excellent function and texture, and therefore can be widely used as general clothing. In the knitted fabric of the present invention, when solvent-spun cellulose fibers are used, the water absorption is relatively excellent, and it is particularly suitable for underwear applications.

  Next, an example explains the present invention.

Example 1
A raw cotton made of solvent-spun cellulose fiber having a single yarn fineness of 0.9 dtex and a fiber length of 34 to 38 mm was processed to prevent fibrillation, and a normal spinning process was applied to obtain a roving yarn. An English formula with an average fluff index of 3 mm or more is introduced by introducing two of the obtained rovings into a ring spinning machine equipped with a compact spinning system at intervals of 2 mm and twisting with a twist coefficient of 3.6. A spun yarn with a cotton count of 120 and a double yarn was obtained.

Next, using the obtained spun yarn and a 22 dtex polyurethane elastic fiber prepared in advance, adopting the knitting conditions of a hook diameter of 86 cm, a needle density of 36 gauge, a total number of needles of 3,900 and a number of 102, The machine of the tengu organization was obtained with the circular knitting machine. The obtained raw machine is dyed in the order of preset, low-concentration alkali treatment, scouring / relaxation, liquid dyeing, finishing set, fixing agent treatment and softener treatment, width 160 cm, basis weight 155 g / m ² and knitted fabric A knitted fabric of the present invention having a density of 69 courses × 53 wales was obtained.

(Comparative Example 1)
A knitted fabric having a width of 160 cm, a basis weight of 155 g / m ^2, and a knitted fabric density of 69 courses × 53 wales was obtained in the same manner as in Example 1 except that the fibrillation prevention processing for the raw cotton was omitted.

(Comparative Example 2)
A knitted fabric having a width of 160 cm, a basis weight of 155 g / m ^2, and a knitted density of 69 courses × 53 wales in the same manner as in Example 1 except that a normal ring spinning machine is used instead of the ring spinning machine equipped with the compact spinning system. Got.

  Table 1 shows the characteristic values of the knitted fabrics obtained in the above Examples and Comparative Examples.

  As is clear from Table 1, the knitted fabric of the present invention was excellent in anti-pilling property and at the same time, excellent in abrasion strength and bursting strength. In contrast, the knitted fabric according to Comparative Example 1 is inferior to the knitted fabric of the present invention in all of the above three characteristics, and the knitted fabric according to Comparative Example 2 has the anti-pilling property of the knitted fabric of the present invention ( Although the knitted fabric according to Example 1 was excellent as well, the abrasion strength and bursting strength were inferior to those of the knitted fabric of the present invention.

  Here, the washing durability of the obtained knitted fabric was evaluated. That is, after washing 30 times according to JIS L0217 103 method, the appearance and texture change of the knitted fabric were visually observed. According to this, the knitted fabric of the present invention has almost no change in appearance and texture from the state before washing, whereas the knitted fabric according to Comparative Example 1 is recognized as fuzzed on the surface of the knitted fabric as the appearance. The soft feeling was somewhat lost. In addition, the knitted fabric according to Comparative Example 2 was slightly lost in softness as a texture although the surface of the knitted fabric was almost free from fuzz.

From the above, it can be evaluated that the knitted fabric of the present invention has practically preferable washing durability.

Claims (1)

A knitted fabric comprising a solvent-spun cellulose fiber having a resin film formed on the surface of the fiber by an anti-fibrillation process and a spun yarn having an average fluff index of 3 mm or more and 40 or less.