JP4587480B2 - Three-leaf cross-section fiber and its woven / knitted fabric - Google Patents

Description

  The present invention relates to a fiber excellent in see-through prevention and a woven or knitted fabric thereof.

2. Description of the Related Art Conventionally, fibers containing inorganic particles such as titanium oxide for the purpose of irregular reflection of incident light into the fiber are known as synthetic fibers that impart anti-transparency. In order to prevent see-through, it is preferable to increase the content of inorganic particles in the fiber. However, if the content of inorganic particles increases, wear of various guides, rollers, wrinkles, knitting needles, etc. in the spinning process, post-processing process, etc. Is a problem. For this reason, Patent Document 1 describes a fiber in which inorganic particles are contained only in the core portion of the core-sheath composite fiber.
Japanese Patent Laid-Open No. 10-317230

  However, this method has a problem that even colored light after dyeing is refracted due to refraction of light by the inorganic particles, and the resulting dyed fabric has insufficient color developability.

  The present invention solves such problems in the prior art, has an excellent anti-slipping effect, has little wear on guides and the like in each process, and has excellent color developability after dyeing and its weave It provides knitting.

  The first gist of the present invention is a three-leaf cross-sectional fiber in which inorganic particles are present in the surface layer part of two side surfaces and the inorganic particles are not present in the surface layer part of one side surface among the three side surfaces of the three-leaf cross-sectional fiber. is there.

  The second gist of the present invention resides in a woven or knitted fabric containing the fiber.

  INDUSTRIAL APPLICABILITY The present invention has an excellent anti-slipping effect, provides a fiber and a woven or knitted fabric with little wear of guides and the like in each step and excellent color developability after dyeing.

  The trilobal cross-section fiber of the present invention requires that the inorganic particles are present on the surface layer portion of two side surfaces of the three side surfaces of the trilobal cross-section fiber, and that the inorganic particles are not present on the surface layer portion of one side surface. It is.

  In the present invention, excellent anti-slipping performance is obtained by the effect of the surface reflected light on each side surface of the trilobal cross-section fiber and the effect of the inorganic particles present on the two side surfaces. In addition, since inorganic particles are not present on the surface layer of one side surface, the coloring property after dyeing is excellent and the lightness is also excellent.

  In addition, as shown in an example of the single fiber cross section of the present invention in FIG. 1, one side surface as referred to in the present invention refers to the surface from the vertex A of one leaf portion to the adjacent vertex B.

  Further, the surface layer portion on the side surface means a portion surrounded by a line segment perpendicular to the surface and the tangent line at the apexes A and B.

  The fiber of the present invention is not particularly limited, such as polyester, polyamide, polyolefin, etc., but since cellulose acetate has a lower refractive index than polymers used for other fiber applications, the amount of incident light into the fiber is large, and a small amount Addition of inorganic particles is preferable because sufficient anti-slipping performance can be obtained.

  Further, in the present invention, the contact with the guides is a projection having a three-leaf cross section, and the contact area with the guides is small and the guides have excellent wear resistance.

In the present invention, the content of the inorganic particles in the fiber is preferably 0.5 to 1.5% by mass. 0.5 mass% or more is preferable from the point of see-through prevention performance, and 1.5 mass% or less is preferable from the point of color development. Examples of the inorganic particles include titanium oxide and barium sulfate, but those having a large difference in refractive index from acetate are preferable, and titanium oxide having a large refractive index (refractive index of 2.5 to 2.7) is particularly preferable. .
Furthermore, in the acetate fiber adopting the dry spinning method, the added inorganic particles exist as minute convex portions when dried and solidified, and the trilobal cross-section fiber of the present invention has a unique powdery due to a synergistic effect with the protruding portion of the leaf portion. It will have a touch.

  In the present invention, the degree of irregularity (diameter ratio of circumscribed circle to inscribed circle) is preferably 2 to 4. A degree of profile of 2 or more is preferred from the standpoint of excellent color developability due to leaves and recesses not containing inorganic particles and color developability due to surface reflection. Further, from the viewpoint of spinning stability, an irregularity of 4 or less is preferable.

  Next, the method for producing a trilobal cross-section fiber of the present invention will be described in detail taking acetate fiber as an example.

  For example, as shown in FIG. 2, the trilobal cross-section acetate fiber of the present invention has two layers of concentric circles so that the outer periphery is an acetate spinning stock solution 2 containing no inorganic particles and the central portion is an acetate spinning stock solution 3 containing inorganic particles. FIG. 3 shows a composite flow forming section 4 capable of forming a composite flow combined in a shape, a straight cylindrical pipe 5 connected to the composite flow forming section, and a tip of the cylindrical pipe. Nozzle pack 7 having a spinning nozzle having a triangular discharge hole and having a spinning nozzle 6 arranged on the same circumference so that one vertex of the triangular shape is in the center direction of the spinning nozzle It can manufacture using the dry-spinning apparatus which consists of.

  Examples of the acetate polymer include cellulose diacetate having an acetone-soluble acetylation rate of 74% or more, and cellulose triacetate having a methylene chloride-soluble acetylation rate of 92% or more.

  The dry spinning conditions may be known conditions. For example, a spinning cylinder temperature is about 70 ° C., a discharge cylinder is discharged so that the discharge linear velocity is about 900 m / min, and the center temperature of the cylinder is about 60 ° C. Spinning may be performed under the conditions of solidification and winding so that the take-up speed is around 720 m / min.

  The woven or knitted fabric containing the trilobal cross-section fibers of the present invention can be obtained by a general method for producing a woven or knitted fabric, but a double woven structure is preferred from the viewpoint of see-through prevention and texture. Further, it may be combined with other fibers by woven or twisted, etc., and it is preferable that 50 to 95% by mass of the trilobal fiber of the present invention is contained.

Hereinafter, the present invention will be described with reference to examples. In addition, each evaluation followed the following method.
(Observation of fiber cross section)
The fiber cross section was observed with an optical microscope.

(Degree of see-through)
Only the refining relaxation was performed at 120 ° C. for 30 minutes, which is a general dyeing condition for cellulose triacetate fabric, and the finished sample fabric was evaluated by the following method.

  The L value was measured with a spectrophotometer (manufactured by Shimadzu Corporation, UV3100PC) in a state where one sample fabric was stacked on a white board (L value 90.7) and a blackboard (L value 13.9). The degree of see-through is calculated by the following formula. If the see-through degree is 80% or more, sufficient see-through preventing performance can be obtained.

Lb = (L value when a sample is stacked on a white board) − (L value when a sample is stacked on a blackboard)
Permeability = {1−Lb value / (L difference between white board and blackboard)} × 100
(Color development)
A sample dyed at 120 ° C. for 30 minutes, which is a general dyeing condition for a cellulose triacetate fabric, and finished was visually evaluated.

  As a standard sample, a triacetate fiber (167 decitex, 40 filament product number; TAB167T40) manufactured by Mitsubishi Rayon Co., Ltd. is used as a warp and twisted in a middle twist, and cotton 40/2 is used as a weft. A fabric with a weave weave consisting of 62 weft / inch, weft density of 62 / inch, one repeat warp and three wefts was used, and the coloring property was compared with this sample.

Cellulose triacetate having an average acetylation degree of 61.6% was dissolved in a mixed solvent of methylene chloride / methanol to prepare a solution (component A) having a concentration of 21.9% by mass. On the other hand, titanium dioxide having an average particle diameter of 0.35 μm is uniformly dispersed by a known method using a ball mill in a mixed solvent of methylene chloride and methanol (mixing ratio: 91/9), and the titanium dioxide concentration in the solvent is 25 mass. % Dispersion was prepared. The cellulose acetate solution (component A) and the titanium dioxide dispersion were stirred and mixed so that the titanium dioxide content was 4.1% by mass with respect to the total solid content, and the spinning dope (component B) was prepared. Created.

    The two types of spinning stock solutions are subjected to compound spinning by a dry spinning method using the spinning apparatus shown in FIG. 2 and the spinning nozzle shown in FIG. 3 so that the central portion becomes an acetate spinning stock solution containing inorganic particles. A component: B component = 84 dtex composed of 80:20, 20 filaments, titanium oxide is included in the surface layer of the two side surfaces of the trilobal cross-section fiber of 3.4 (FIG. 1), and the entire fiber has a titanium oxide content. A cellulose acetate fiber of 0.8% by mass was obtained.

  The processed fiber having a fineness of 200 dtex consisting of 95% by mass of the fiber and 5% by mass of the polyurethane fiber ("Roika" manufactured by Asahi Kasei Fibers Co., Ltd., 22 dtex) is stretched at a draft of 2.5 times. Double covering yarn with 800T / M twist in the Z direction and 800T / M in the S direction for warp and weft, warp density is 120 / inch, weft density is 85 / inch, 1 repeat A fabric with a diagonal weave consisting of three warps and wefts was made, and the degree of see-through and visual color development were evaluated. The degree of see-through was 89.2%, and the color development was equivalent to that of the standard sample. In addition, in the yarn processing step and the weaving step, no wear of the yarn feeding guide and wrinkles was recognized.

(Comparative Example 1)
The same two spinning stock solutions as in Example 1 were mixed uniformly so that A component: B component = 20: 80, and the same discharge part as in Example 1 was triangular in a normal dry spinning apparatus. Single spinning was carried out using a nozzle to obtain a trilobal cross-section fiber having 84 dtex, 20 filaments, and an irregularity of 3.4. The obtained fiber uniformly contained titanium oxide throughout the fiber, and the titanium oxide content of the whole fiber was 0.8% by mass.

  A processed yarn having a fineness of 200 dtex consisting of 95% by mass of fiber and 5% by mass of polyurethane was used as the warp and weft. The warp density was 120 / inch, the weft density was 85 / inch, and one repeat was the warp. A fabric with a diagonal weave consisting of three wefts was made, and the degree of see-through and visual color development were evaluated.

  Although the degree of see-through was 88.3%, the color development was inferior, and in the yarn processing step and the weaving step, wear of the yarn feeding guide and wrinkles was observed in each step such as guide and wrinkles.

It is the schematic which shows an example of the single fiber cross section of this invention. It is the schematic which shows an example of the dry-type spinning apparatus of this invention. It is the schematic which shows an example of the spinning nozzle of this invention.

Explanation of symbols

1: Side surface not containing inorganic particles 2: Acetate spinning stock solution containing inorganic particles 3: Acetate spinning stock solution not containing inorganic particles 4: Composite flow forming unit 5: Cylindrical pipe 6: Spinning nozzle 7: Nozzle packs A, B, C: The apex of each leaf

Claims (3)

  Among the three side surfaces of the three-leaf cross-section fiber, a three-leaf cross-section fiber in which inorganic particles are present in the surface layer portion of two side surfaces and no inorganic particles are present in the surface layer portion of one side surface.   The trilobal cross-section fiber according to claim 1, wherein the content of inorganic particles in the fiber is 0.5 to 1.5 mass%.   A woven or knitted fabric comprising the trilobal cross-section fiber according to claim 1 or 2.

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