JP2007262591A - Cut pile fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a cut pile fabric having a core-sheath conjugate fiber kneaded with a matting agent as a pile fiber, which solves a whitish appearance without impairing coloring quality of pile surface by changing the cross sectional structure of the core-sheath conjugate fiber and an application method of the matting agent to be kneaded. <P>SOLUTION: A core-sheath polyester conjugate fiber comprising a polyester having a matting agent content of <0.1 wt.% as a core component and a polyester having a matting agent content of ≥0.8 wt.% as a sheath component, in which the core component constitutes a fiber core 11 and the sheath component constitutes a sheath layer 12 covering the fiber core is used as a cut pile. The core-sheath polyester conjugate fiber has a single fiber fineness of 1.0-5.5 dtex. Its cross section is formed into a flat cross-sectional shape having recessed parts 14 depressed inside and projecting parts 15 projecting outside. The area occupation ratio of the sheath layer in the cross-section is 10-50%. The amount k of the matting agent coated, which is expressed as the product of the thickness t of the sheath layer and the content w of the matting agent is preferably 2.5-5.5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, a pile surface is constituted by a cut pile such as a cut pile woven fabric (moquette, etc.), a cut pile knitted fabric (double raschel, etc.), a cut pile raised cloth (tricot velor, etc.) finished by shaving the raised surface. In particular, the present invention relates to cut pile fabrics used for interior materials for transportation such as automobiles, trains, and airplanes, and in particular for chairs.

In this type of pile fabric, the color of the pile surface changes depending on the direction in which the cut pile is pushed down, and a so-called finger mark where the shade of the color appears in a mark shape at the place where the cut pile is pushed down in the opposite direction. There is a phenomenon called white blur (hereinafter referred to as white blur).
It is known that this white blur is caused by a difference in light reflection between the fiber cross section that is the tip of the cut pile and the fiber side surface that is the side surface of the cut pile.
Chemical fibers are fibers in which titanium oxide fine particles (hereinafter simply referred to as “titanium oxide”), which have no specific absorption in the visible light region and have a high visible light reflectance and refractive index, are kneaded as a matting agent. Yes, this fiber is called “dull fiber” because of its low gloss, and the difference in gloss between the fiber cross section and the fiber side is less than the so-called “bright fiber” where titanium oxide is not kneaded. Therefore, it is considered effective in preventing white blur on the pile surface.
However, because there is no specific absorption in the visible light region and it also acts as a white pigment because of its high reflectance, the fiber in which titanium oxide is kneaded has poor color development and vividly colored using it. A cut pile fabric cannot be obtained.

As a method for improving the color developability of the dull fiber, a method using barium sulfate in combination with titanium oxide is known (for example, see Patent Document 1).
As another method for improving the color developability of the dull fiber, a method is known in which the dull fiber has a core-sheath composite structure and the sheath layer is made of a cationic dyeable polyester (see, for example, Patent Document 2).
As another method for improving the glare of bright fibers with good color development, a method is known in which bright fibers have a core-sheath composite structure, and a matte agent is kneaded in the sheath layer more than the fiber axis. (For example, refer to Patent Document 3).

JP 09-078353 A Japanese Patent Laid-Open No. 62-268855 Japanese Patent Laid-Open No. 01-306646

Thus, although there are various attempts to prevent white blurring without impairing the color developability of the pile fiber, a sufficient effect has not been obtained.
In particular, in a cut pile fabric made of pile fibers having a single fiber fineness of 5.5 dtex or less, which is optimal for chair upholstery, white blurring tends to occur.
In a cut pile fabric composed of pile fibers having a single fiber fineness of 5.5 dtex or less, it becomes difficult to dye deep and dark colors as the single fiber fineness becomes thin, and the matting agent prevents color development. Therefore, it has been considered difficult to prevent white blur without impairing the color development of the pile surface.

When observing a pile surface that is prone to white blurring, when the surface reflected light on the side of the pile fiber is visible, it appears as white light and the pile surface looks whitish. It was found that when the surface reflected light is not visible, the color of the pile fiber is not affected by the surface reflected light (white light) and is visible to the eyes, so it looks dark.
In addition, if the single fiber fineness of the pile fiber is reduced, the number of pile fibers constituting the pile yarn is increased by that amount, and the specific surface area of the pile fiber in the cut pile is increased. As a result, the side surface of the pile fiber is increased. As the amount of light reflected on the surface of the pile increases, white blurring on the pile surface is likely to occur.
Furthermore, in the core-sheath composite fiber, even when a matting agent is kneaded, it has been found that the effect of preventing white blurring and the color developability of the fiber greatly change depending on the method of applying the matting agent.

  Based on these findings, the present invention changes the cross-sectional structure of the core-sheath composite fiber and the method of applying the matting agent, and eliminates the white blur on the pile surface of the cut pile fabric without impairing the color development of the pile fiber. With the goal.

  That is, the cut pile fabric according to the present invention comprises (a) a polyester having a matting agent content of less than 0.1% by weight as a core component and a polyester having a matting agent content of 0.8% by weight or more as a sheath component. And the pile surface is constituted by a cut pile mainly composed of core-sheath composite polyester fiber in which the core component constitutes the fiber axis core 11 and the sheath component constitutes the sheath layer 12 covering the fiber axis core 11. (B) The single fiber fineness of the core-sheath composite polyester fiber is 1.0 to 5.5 dtex, and (c) the area occupation ratio of the sheath layer in the cross section of the core-sheath composite polyester fiber is 10 to 50%. Yes, (d) Matting agent coating amount k (= t ×) expressed as the product of the thickness t (unit: μm) of the sheath layer 12 and the matting agent content w (unit: wt%) of the sheath layer 12 w) is 2.5 to 5.5 (2.5 ≦ k ≦ 5.5). And features.

  The second feature of the cut pile fabric according to the present invention is that, in addition to the first feature, the core-sheath composite polyester fiber has a flat cross-sectional shape, and the two cross-sectional directions X and Y are orthogonal to each other. The dimension L in one direction X is 2 to 5 times the dimension H in the other direction Y, and the flatness L / H shown as a ratio of these dimensions is 2 to 5.

  The third feature of the cut-pile fabric according to the present invention is that, in addition to the second feature described above, the cross section of the core-sheath composite polyester fiber has alternating convex portions 15 protruding outward and concave portions 14 recessed inward. It is in the point which comprises the flat cross-sectional shape enclosed by the uneven | corrugated outline 13. FIG.

In the present invention, since the single fiber fineness of the core / sheath composite polyester fiber is 1.0 to 5.5 dtex and the area occupancy of the sheath layer in the cross section is 10 to 50%, the core / sheath composite polyester fiber is The thickness (diameter) assuming a circular cross section is 9.6 to 22.5 μm, the thickness (diameter) of the fiber axis is 6.8 to 21.3 μm, and the thickness (t) of the sheath layer Becomes 0.25 to 3.3 μm.
Since the content of the matting agent of the fiber core occupying most of the thickness of the core-sheath composite polyester fiber, that is, 50 to 90% of the cross section is less than 0.1% by weight, the fiber shaft core is a matting agent. Vividly colored without being hindered and the thickness (t) of the sheath layer is 0.25 to 3.3 μm, so that the white blur is improved by the reduction of the surface reflected light on the fiber side surface, and the sheath layer The pile fiber is vividly colored by the color of the fiber axis without being concealed.

Of course, the color developability of the fiber is impaired by the matting agent. In the present invention, since the matting agent content of the fiber core 11 is less than 0.1% by weight, the color developability of the fiber core 11 is not particularly impaired by the matting agent.
However, since the content w of the matting agent in the sheath layer 12 is 0.8% by weight or more, the color developability of the sheath layer 12 is impaired by the matting agent, and the fiber core 11 is covered with the sheath layer 12. The color developability of the core-sheath composite fiber is also impaired by the matting agent contained in the sheath layer 12.
However, even if the matting agent content w is 0.8% by weight or more, if the sheath layer 12 is thin, the color of the well-colored fiber shaft core 11 appears through the sheath layer 12, The color developability of the core-sheath composite fiber is not significantly impaired by the matting agent contained in the sheath layer 12.
On the other hand, even if the matting agent content w is small, if the sheath layer 12 is thick, the color of the fiber core 11 is difficult to appear through the sheath layer 12, so that the color development of the core-sheath composite fiber is It will also be damaged by the matting agent contained in the sheath layer 12. However, if the matting agent content w is small, the color developability of the sheath layer 12 is not particularly impaired by the matting agent, and the sheath layer 12 is favorably colored. In other words, it is difficult to say that the coloring property of the core-sheath composite fiber is impaired by the matting agent contained in the sheath layer 12.
Therefore, whether or not the color developability of the core-sheath composite fiber is impaired by the matting agent contained in the sheath layer 12 should be examined in relation to the matting agent content w of the sheath layer 12 and the thickness t. Become.
The same can be said for the improvement of the white blur prevention effect.

  In the present invention, in consideration of these points, the coating amount k of the matting agent shown as the product of the thickness t (unit: μm) of the sheath layer and the matting agent content w (unit: wt%) of the sheath layer. 2.5 to 5.5 (2.5 ≦ k ≦ 5.5), so that the matting agent contained in the sheath layer 12 does not impair the color development of the entire core-sheath composite polyester fiber, and the pile surface Improves white blurring prevention effect.

In the present invention, since the core-sheath composite polyester fiber has a flat cross-sectional shape, the cross-sectional secondary moment is smaller than that of the circular cross-sectional shape, and a cut pile fabric with a softer and smoother feel is obtained. It is done.
Further, in the present invention, since the uneven side surface of the core-sheath composite polyester fiber having a flat cross-sectional shape is provided with unevenness, the surface reflected light is diffused and the white blur on the pile surface is conspicuous as compared with the flat side surface. It becomes difficult.

  In this way, it is possible to obtain a cut pile fabric that balances the effect of preventing white blurring and preventing the deterioration of color developability and has a good texture and is suitable for chairs for automobiles, trains, airplanes, and the like.

In addition to titanium oxide, the matting agent expresses the effects of the present invention and can be stably dispersed in a polyester fiber polymer. Zirconium oxide, magnesium oxide, aluminum oxide, silicon oxide, antimony oxide, zinc oxide, calcium carbonate, Although barium sulfate etc. can be used, it is preferable to use titanium oxide, silicon oxide, zinc oxide and calcium carbonate from the viewpoint of dispersibility with the polyester fiber polymer, and it is particularly preferable to use titanium oxide.
In the present invention, the content of the matting agent in the fiber axis is set to less than 0.1% by weight so that the coloring property of the pile fiber is not impaired by the matting agent. Desirably less than 0.05% by weight, preferably zero.
In order to make the color of the fiber shaft core, which does not contain a matting agent and is highly colored, appear on the outer surface of the pile fiber without being concealed by the sheath layer, It is desirable to make the fiber axis core thicker relative to the sheath layer so that the area occupation ratio of the sheath layer on the surface is 40% or less and the thickness (t) of the sheath layer is 2.5 μm or less. .
However, when the sheath layer becomes thin, the sheath layer 12 peels off due to friction with yarn guides, wrinkles, wrinkles, needles, etc. in the knitting / knitting preparation process such as yarn winding and warping, and the knitting / knitting process. Not only is it exposed, but the matting effect of the matting agent is also reduced.
Considering this point, the area occupation ratio of the sheath layer in the cross section of the core-sheath composite polyester fiber is 40 to 20%, preferably 35 to 20%, and the thickness (t) of the sheath layer is 0.6 to 2%. The actual fineness of the fiber core is preferably 0.9 to 2.2 dtex.

In the present invention, the coating amount k (= t × w) of the matting agent shown as the product of the thickness t of the sheath layer and the matting agent content w is 2.5 to 5.5 (2.5 ≦ k ≦ 5). .5) is because the color of the fiber axis appears on the outer surface of the pile fiber without being damaged by the sheath layer, and the matting effect by the matting agent is ensured.
Generally, it is possible to mix a matting agent with a fiber polymer around 6.35% by weight. However, when a large amount of matting agent is blended in the sheath layer having a thickness (t) of 0.6 to 2.5 μm, not only is it difficult to obtain a pile fabric with a rich color, but the surface of the pile fiber is not removed by the matting agent. The surface becomes rough, and jigs such as yarn path guides that come into contact with the pile fiber and the pile yarn are handled easily. In order to avoid such problems, the amount of matting agent added to the fiber polymer should be less than 6% by weight, but the blending ratio with respect to the sheath layer is sufficient even around 1.5% by weight. Since the content of the matting agent is small, the color developability of the pile fiber is secured.

In the present invention, the flatness (L / H) of the core-sheath composite polyester fiber is set to 2 to 5 in order to obtain various characteristics desirable as a pile fiber such as a soft feel and spreadability. The so-called cross-sectional second moment in terms of material mechanics is smaller than that of a circular cross-section fiber. For example, even if the fineness of a flat cross-section fiber (flatness 5) is 1.0 dtex, the circular cross-section fiber has a fineness of 0.45 dtex. A cut-pile fabric having a soft feel can be obtained in the same manner as a cut-pile fabric made of so-called extra-fine fibers. However, when the flatness (L / H) is less than 2, the effect on the tactile sensation as if it becomes an ultrafine fiber is reduced, while the flatness (L / H) exceeds 5 and becomes too large. In the fiber core, the transparency increases and does not become darker, and in the sheath layer, the matting agent is diluted to reduce the matting effect, and the flat side shape increases the gloss, and the cut pile also has hair. Since it is easy to collapse, it is counterproductive to preventing white blur.
Considering this point, the flatness (L / H) of the core-sheath composite polyester fiber should be 2 to 3.5, and the cross-sectional shape is not a flat plate, but a convex portion 15 protruding outward and an inner side. The recessed section 14 is surrounded by alternating concavo-convex contour lines 13, and the projecting section and the projecting section, and the projecting section and the projecting section are symmetrical in the thickness direction (YY), respectively. As shown, the central portion and the left and right end portions form a convex portion 15 projecting outward, and the center portion and the left and right end portions are surrounded by a contour line 13 that is recessed inward, and are rhomboid or elliptical. And a double-sided, three-sided flat cross-sectional shape with a depression (concave part 14) between the apex (convex part 15) and the apex (convex part 15) on the four sides, or the central part forms a concave part and the center Convex and concavity continue symmetrically with the concave part of the part as a boundary, and both right and left end parts form convex parts The surface Yotsuyama flat cross-sectional shape.
The technical scope of the present invention depends on the number of inflection points P of the contour line 13 of the cross section of the core-sheath composite polyester fiber, the shape of the concave section 14, the convex section 15, or the cross section of the core-sheath composite polyester fiber forming a flat cross section. Will not be reduced.

In order to enhance the spreadability, tactile sensation, texture, etc. of the cut pile, it is recommended to impart crimp to the core-sheath composite polyester fiber in order to more effectively implement the present invention.
Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.

[Examples 1-7 and Comparative Examples 1-4]
A polyethylene terephthalate bright chip having a titanium oxide content of 0.025% by weight is used as the core component polymer of the core / sheath composite polyester fiber, and a polyethylene terephthalate ultrafull chip having a titanium oxide content of 6.35% by weight is used as the sheath component polymer. Mixed chips with polyethylene terephthalate bright chips having a titanium oxide content of 0.025% by weight, and polyethylene terephthalate bright chips having a titanium oxide content of 2.5% by weight and polyethylene terephthalate bright chips having a titanium oxide content of 0.025% by weight. And a mixed tip.
The core-sheath composite polyester fiber is spun using a die having a flat cross-sectional shape (Fig. 1), and a core-sheath composite polyester fiber unstretched yarn is composite-spun at a spinning temperature of 280 ° C and a spinning speed of 1,000 m / min. Stretched through a first roller at 88 ° C and a second roller at a temperature of 130 ° C at a winding speed of 600 m / min, and a flat-shell core-sheath composite with a single fiber fineness of 1.74 dtex and flatness (L / H) of 2.2 A multifilament yarn (167 dtex-96 fil) of polyester fiber was obtained.

[Comparative Examples 5-6]
Using a polyethylene terephthalate bright chip having a titanium oxide content of 0.025% by weight and a polyethylene terephthalate fludal chip having a titanium oxide content of 2.50% by weight, respectively, from a die having a three-section flat cross-sectional shape, a spinning temperature of 280 ° C., a spinning speed of 1, Polyester bright fiber unstretched yarn (Comparative Example 5) and polyester fludal fiber unstretched yarn (Comparative Example 6) are spun alone at 000 m / min and wound on a first roller at a temperature of 88 ° C and a second roller at a temperature of 130 ° C. Drawing was performed at a speed of 600 m / min to obtain a multifilament yarn (167 dtex-96 fil) of a flat cross-sectional polyester fiber having a single fiber fineness of 1.74 dtex / flatness (L / H) of 2.2.

  These multifilament yarns are passed through a two-heater false twisting device, false twisted, four twisted (200 t / m S twist), set by twisting, yellow disperse dye 0.95% owf and The dye liquor consisting of 0.42% owf of red disperse dye and 0.81% owf of blue disperse dye was heated and dyed with cheese at 136 ° C. for 20 minutes to give a gray pre-dyed pile yarn.

  Next, using these pre-dyed pile yarns, polyester false twisted yarn (330 dtex-96fil air entangled yarn) as ground warp yarn, gray-colored dyed polyester spun yarn (30/2) as ground weft yarn, A weft double pile loom according to Japanese Patent No. 3248058 (Japanese Patent Laid-Open No. 9-256244) owned by Kawashima woven company, warp density 48 / 2.54 cm, weft density 60 / 2.54 cm, weft pile yarn density 20 Weave a double moquette fabric with 2.54cm double woven structure, brush the pile surface of the moquette fabric (cut pile fabric) obtained by center cutting, and pass through a shearing device to a pile length of 3mm After cutting again, change direction and pass through brushing device and shearing device. ) To the finish.

The matting agent content (w) of the sheath layers of the flat cross-section core-sheath composite polyester fibers of Examples 1 to 7 and Comparative Examples 1 to 4 is a polyethylene terephthalate superfull-dal chip having a titanium oxide content of 6.35% by weight and oxidation. A mixing ratio with a polyethylene terephthalate bright chip having a titanium content of 0.025% by weight, and a polyethylene terephthalate bright chip having a titanium oxide content of 2.50% by weight and a polyethylene terephthalate bright chip having a titanium oxide content of 0.025% by weight, Depending on the mixing ratio, the area occupancy of the sheath layer and the thickness (t) of the sheath layer in the cross section of the flat cross-section core-sheath composite polyester fiber are adjusted by adjusting the spinning discharge amount of the core component polymer and the sheath component polymer, respectively. Settings were made as shown in Table 1.
Pile surface white blur evaluation value, color development evaluation value, lightness L value, lightness difference ΔL value, and thickness (t) of the sheath layer of the pile fiber in Examples 1 to 7 and Comparative Examples 1 to 6 Values are measured in the following manner and shown in Table 1.
In Table 1, a polyester bright fiber (comparative example 5) having a titanium oxide content of 0.025% by weight, which is spun independently, is indicated as a fiber having only a fiber axis core with a sheath layer thickness of 0, and is a single-spun oxidized fiber. The polyester full fiber (Comparative Example 6) having a titanium content of 2.50% by weight is indicated as a fiber having only a sheath layer without a fiber axis.

  White blur (sensory test; absolute evaluation method): The cut pile fabrics of the example and the comparative example are individually placed on a flat plate, and the pile surface is aligned in a certain direction, and the trace and surroundings are boiled with fingers in the opposite direction. The difference in color difference was visually checked, and the evaluation was made in three stages: “◯” when the trace was not noticeable, “Δ” if it was slightly noticeable, and “x” if it was noticeable.

White blur (Sensory test; Paired comparison method): Put the cut pile fabrics of the example and the comparative example as a set on a flat plate, align the pile surface in a certain direction, and boil it with your finger in the opposite direction The difference in color difference between the mark and the periphery is visually confirmed, the color difference between the mark and the periphery of the two cut pile fabrics in each set is compared, and the mark difference between the two pile fabrics in the two sheets Compared to the color difference between the trace and the periphery of the other pile fabric, the difference in color between and the surrounding area is “+2 points” when it is almost inconspicuous, and “+1 point” when it is not particularly noticeable. The evaluation was quantitatively based on the evaluation score of “0 point” when there was none, “−1 point” when it was slightly noticeable, and “−2 point” when it was noticeable.
Therefore, the evaluation point of each sample is positioned between −2.0 and +2.0, and the larger this value is, the less white blurring is noticeable.

  Color developability (sensory test; visual method): Check the color density of the pile surface of the cut pile fabric and the sharpness (evaluates that there is no whitish color) under illumination that causes diffuse reflection. If it is quite dark and clear, “◎”, if it is dark and clear, “○”, if it is slightly dark and clear, “△”, if it is thin and unclear, “×”, if it is very thin and unclear Was evaluated on a scale of “XX”.

  Color developability (colorimetric inspection): The L, a, and b values of the cut pile fabric were measured using a colorimeter to quantify the color developability. The lightness L value was adopted as the difference in light and shade and the difference in sharpness. A smaller value means that the color looks darker.

  Lightness difference ΔL value between the fiber cross section and the fiber side surface: The L value (L * b) of the cross section of the pile bundle of the pile fiber and the L value (L * a) of the side surface are measured using a colorimeter, and the lightness difference ΔL value = L * a−L * b is calculated.

  Sheath layer thickness (t) (unit: μm): The cross-sectional outline of the pile fiber is divided into 32 equal parts, the thicknesses of the 32 sheath layers are measured, and the average value of the sheath layer thickness (t) Is calculated.

FIG. 2 shows the correlation between the white blur evaluation value by the paired comparison method of the pile surfaces in Examples 1 to 7 and Comparative Examples 1 to 6 shown in Table 1, and the brightness difference ΔL value between the pile fiber cross section and the side surface.
In FIG. 2, the data of Examples 1 to 7 are indicated by “◯” together with sample numbers T ₁ , T ₂ , T ₃ , T ₄ , T ₅ , T ₆ , and T ₇ , and the data of Comparative Examples 1 to 6 are shown. Are indicated by “●” together with sample numbers X ₁ , X ₂ , X ₃ , X ₄ , X ₅ and X ₆ .
In FIG. 2, a cut pile fabric with less noticeable white blur has a smaller lightness difference ΔL value, between the lightness difference ΔL value of the fiber cross section and the fiber side surface and the white blur evaluation value by sensory test (pair comparison method), A correlation in which the brightness difference ΔL value and the white blur evaluation value are proportional was confirmed.

FIG. 3 illustrates the relationship between the white blur evaluation value and the matting agent coating amount k in Examples 1 to 7 and Comparative Examples 1 to 6 shown in Table 1 by the white blur evaluation / covering amount relation curve f (k). The relationship between the lightness L value (color development evaluation value) and the matting agent coating amount k is illustrated by the color development evaluation / coating amount relationship curve f (L).
FIG. 3 shows white blur evaluation data of Examples 1 to ₇ together with sample numbers T ₁ , T ₂ , T ₃ , T ₄ , T ₅ , T ₆ , and T _{7 by} “◯”. The color development evaluation data of 7 to 7 are indicated by “□”, and the white blur evaluation data of Comparative Examples 1 to ₆ together with the sample numbers X ₁ , X ₂ , X ₃ , X ₄ , X ₅ and X _{6 are} “●”. The data of color development evaluation in Comparative Examples 1 to 6 are indicated by “■”.
In addition to the evaluation scale by the paired comparison method showing the white blur prevention effect in FIG. 3, each data (sample numbers T ₁ , T ₂ , T ₃ , T ₄ , T ₅ , T ₆ , T ₇ , X ₁ , X ₂ , X ₃ , X ₄ , X ₅ , X ₆ ), the three-level evaluation values (○, △, ×) by the absolute evaluation method, and the scale of the lightness L value indicating the color development of the pile surface, data (sample No. _{T 1, T 2, T 3} , T 4, T 5, T 6, T 7, X 1, X 2, X 3, X 4, X 5, X 6) 5 out visual evaluation method Values (◎, ○, △, ×, XX) are added.

  As is apparent from Table 1 and FIG. 3, when the data of Examples 1 to 7 and Comparative Examples 1 to 6 are compared, the cut pile fabrics obtained in Examples 1 to 7 are less prone to white blurring and have color development properties. It was also excellent. On the other hand, the cut pile fabrics obtained in Comparative Examples 1 to 6 had poor color development when white blurring was not noticeable, and conversely, white blurring was conspicuous when color blurring was good.

The matting agent coating amount k expressed as the product of the thickness t (unit: μm) of the sheath layer and the matting agent content w (unit: wt%) is 0.4 to 2.3 (k <2.5). In the cut pile fabric of No. 1, the data of Comparative Example 2 (k = 2.3) (FIG. 3, sample number X ₂ ) and the data of Comparative Example 4 (k = 1.7) (FIG. 3, sample number X ₄ ) As shown in the figure, although the lightness L value is low and the color developability is good, white blurring is noticeable. When the coating amount k of the matting agent exceeds 5.5, white blurring is not noticeable, but Comparative Example 1 (k = 5. 6) and the data of Comparative Example 3 (k = 7.4) (FIG. 3, sample numbers X ₁ and X ₃ ), it was confirmed that the lightness L value was high and the color development was reduced.
In FIG. 3, the evaluation value “Δ” when the five-step evaluation values (◎, ○, Δ, ×, XX) according to the attached visual method are dense and clear is the lightness L value is “27”. The matting agent coating amount k at the position where the brightness L value is “27” is k = 5.5, while the matting agent coating amount k at the position where the white blur prevention effect appears is Since k = 2.5, the technical meaning of setting the matting agent coating amount k to k = 2.5 to 5.5 in the present invention will be understood.
As shown in FIG. 3, in the cut pile fabrics of Examples 1 to 7, the matting agent coating amount k is all 2.5 to 5.5 or more, and the white blur evaluation value by the sensory test (pair comparison method) is almost all. It was positive, and the lightness L value (color developability) did not exceed 27, and it was confirmed that a white blur prevention effect was obtained without impairing the color developability.

  As is apparent from a comparison of Examples 1-7 and Comparative Examples 1-6, according to the present invention, a cut pile fabric in which white blurring is not noticeable can be obtained without impairing the color developability.

[Examples 8 to 9 and Comparative Examples 7 to 10]
Polyethylene terephthalate bright chip having a titanium oxide content of 0.025% by weight, polyethylene terephthalate semidal chip having a titanium oxide content of 0.3% by weight, a polyethylene terephthalate fludal chip having a titanium oxide content of 2.5% by weight, and titanium oxide Using a polyethylene terephthalate mixed chip having a titanium oxide content of 1.4% by weight, in which a polyethylene terephthalate bright chip having a content of 0.025% by weight and a polyethylene terephthalate fuller chip having a titanium oxide content of 2.5% by weight are mixed, For spinning, a die having a circular cross-sectional shape is used, and a circular cross-section core-sheath composite polyester fiber having a sheath layer titanium oxide content of 1.4% by weight shown in Table 2 at a spinning temperature of 280 ° C. and a spinning speed of 1,000 m / min is unstretched. yarn (sample No.; T ₈₎ and a sheath layer titanium oxide Emission content of 2.5 wt% of a circular cross-section core-sheath bicomponent polyester fibers undrawn yarn (Sample No.; T ₉₎ and the sheath layer of titanium oxide content of 0.3 wt% of a circular cross-section core-sheath bicomponent polyester fibers undrawn yarn ( sample No.; three polyester fiber undrawn yarn with X ₇₎ as well as composite spinning, 0.025 wt% of a circular cross-section bright polyester fiber undrawn titanium oxide content (sample Nos; oxidized Y ₁₎ titanium Circular cross-section semidal polyester fiber unstretched yarn (sample number; Y ₂ ) having a content of 0.3% by weight and circular cross-section fulldal polyester fiber unstretched yarn having a titanium oxide content of 2.5% by weight (sample number; Y ₃ ) And unstretched three types of polyester fiber unstretched yarns, each drawn through a first roller at a temperature of 88 ° C. and a second roller at a temperature of 130 ° C. at a winding speed of 600 m / min. To give multifilament yarns of circular cross-section polyester fibers .75dtex the (168dtex-96fil).

  Each of these multifilament yarns is passed through a two heater false twisting device, false twisted, four twisted (200 t / m S twist), twisted and set, and then a dye solution that becomes a beige disperse dye. The temperature was raised and the cheese was dyed at 136 ° C. for 20 minutes to obtain a beige pre-dyed pile yarn.

  Next, using these pre-dyed pile yarn, polyester false twisted yarn (330dtex-96fil air entangled yarn) as ground warp yarn, beige pre-dyed polyester spun yarn (30/2) as ground weft yarn, Using a weft double pile loom according to Japanese Patent No. 3248058 (Japanese Patent Laid-Open No. 9-256244) owned by Kawashima Fabric, warp density 48 yarns / 2.54 cm, weft density 60 yarns / 2.54 cm, weft pile yarn density 20 Weave a double moquette fabric with 2.54cm double woven structure, brush the pile surface of the moquette fabric (cut pile fabric) obtained by center cutting, and pass through a shearing device to a pile length of 3mm After cutting again, change direction and pass through brushing device and shearing device. Finished in 帛).

Pile surface white blur evaluation value, color development evaluation value, lightness L value, lightness difference ΔL value, and thickness (t) of the sheath layer of the pile fiber in Examples 8 to 9 and Comparative Examples 7 to 10 The values were measured in the same manner as in Examples 1 to 7 and Comparative Examples 1 to 6, and the results shown in Table 2 were obtained.
In Table 2, a polyester bright fiber (comparative example 8) having a titanium oxide content of 0.025% by weight, which is spun independently, is indicated as a fiber having only a fiber axis core with a sheath layer thickness of 0, and is a single-spun oxidized fiber. A polyester full semidal fiber having a titanium content of 0.30% by weight (Comparative Example 9) and a polyester full fiber having a titanium oxide content of 2.50% by weight (Comparative Example 10) are fibers having only a sheath layer without a fiber axis. It is displayed as.

FIG. 4 illustrates the relationship between the white blur evaluation value and the matting agent coating amount k in Examples 8 to 9 and Comparative Examples 7 to 10 shown in Table 2 by the white blur evaluation / covering amount relation curve f (k). The relationship between the lightness L value (color development evaluation value) and the matting agent coating amount k is illustrated by the color development evaluation / coating amount relationship curve f (L).
In FIG. 4, the white blur evaluation data of Examples 8 to 9 are indicated by “◯” together with the sample numbers T ₈ and T ₉ , and the color development evaluation data of Examples 8 to 9 are indicated by “□”. The white blur evaluation data of Comparative Examples 7 to 10 are indicated by “●” together with the sample numbers X ₇ , Y ₁ , Y ₂ , and Y ₃ , and the color development evaluation data of Comparative Examples 7 to 10 are indicated by “■”. Is shown.

  When the data of Examples 8 to 9 and Comparative Examples 7 to 10 are compared, the cut pile fabrics obtained in Examples 8 to 9 are apparent from Table 2 and FIG. 4 in the same manner as the pile fabrics of Examples 1 to 7. As shown, white blurring was not noticeable and color development was excellent. On the other hand, the cut pile fabrics obtained in Comparative Examples 7 to 10 have poor color developability when the white blur is not noticeable, and conversely, the cut pile fabrics obtained in Comparative Examples 1 to 6 are white when the color developability is good. The blur was noticeable.

FIG. 5 shows a multifilament yarn (sample number; T ₈ , T ₉ , X) of a circular cross-section core-sheath composite polyester fiber having an area occupancy ratio of 50% in the cross section of the fiber and a thickness of the sheath layer of 1.8 μm. ₇ ) and the white blur evaluation value and lightness L value (color development) of the pile surface of the multifilament yarn (sample number; Y ₁ , Y ₂ , Y ₃ ) of a circular cross-section polyester fiber (non-core-sheath composite) The relationship of (evaluation value) is illustrated by a white blur evaluation / lightness L value relationship curve g.
In FIG. 5, the data of Examples 8 to 9 are shown by “◯” together with the sample numbers T ₈ and T ₉ , and the data of Comparative Examples 7 to 10 are shown with the sample numbers X ₇ , Y ₁ , Y ₂ and Y _3. It is indicated by “●”.

Circular blur core / sheath composite polyester fiber multi-filament yarn cut pile fabric (sample number; T ₈ , T ₉ , X ₇ ) white blur evaluation / lightness L value relationship curve g (50%) and circular Comparison of white blur evaluation and lightness L value relation curve g (100%) of cut pile fabric (sample number; Y ₁ , Y ₂ , Y ₃ ) which is a multifilament yarn of cross-sectional polyester fiber (non-core-sheath composite) As can be seen, the cut pile fabric (sample number; T ₈ , T ₉ , X ₇ ) that is a multifilament yarn of a circular cross-section core-sheath composite polyester fiber is a multifilament yarn of a circular cross-section polyester fiber (non-core-sheath composite). As compared with the cut pile fabric (sample number; Y ₁ , Y ₂ , Y ₃ ), there is little decrease in the color development of the pile surface due to the white blurring preventing function of the matting agent.
Thus, according to FIG. 5, the pile fiber has a core-sheath cross-sectional structure, and the area occupancy ratio of the sheath layer in the cross-section of the pile fiber is 50% or less. It is advantageous in application, the area occupation ratio of the sheath layer is 40 to 20%, preferably 35 to 20%, the thickness (t) of the sheath layer is 0.6 to 2.5 μm, and the fiber axis It has been confirmed that it is effective to make the real fineness of 0.9 to 2.2 dtex.

It is an expanded sectional view of the core-sheath composite polyester fiber according to the present invention. It is a related figure of the brightness difference (DELTA) L value of a fiber cross section and a fiber side surface, and the white blur evaluation value by a sensory test (pair comparison method). FIG. 5 is a relationship curve diagram of a white blur evaluation / coating amount relationship on a pile surface and a color development evaluation / coating amount relationship. FIG. 5 is a relationship curve diagram of a white blur evaluation / coating amount relationship on a pile surface and a color development evaluation / coating amount relationship. It is a relationship curve figure of the white blur evaluation value of a pile surface, and color development evaluation lightness L value.

Explanation of symbols

11: Fiber axis 12: Sheath layer 13: Outline 14: Concave portion 15: Convex portion f (k): White blur evaluation / cover amount relationship curve f (L): Color development evaluation / cover amount relationship curve g: White blur Evaluation / lightness L-value relationship curve

Claims (3)

(A) In the cut pile fabric, the fibers constituting at least a part of the cut pile are core-sheath composite fibers, the core component of which includes polyester and a matting agent of less than 0.1% by weight, and the sheath component is Contains polyester and more than 0.8% matting agent,
(B) The core-sheath composite polyester fiber has a single fiber fineness of 1.0 to 5.5 dtex,
(C) The core-sheath composite polyester fiber has an area occupancy of the sheath layer in the cross section of 10 to 50%,
(D) The matting agent coating amount k (= t × w) expressed as the product of the thickness t (unit: μm) of the sheath layer and the matting agent content w (unit: wt%) of the sheath layer is 2 A cut-pile fabric characterized by satisfying .5 to 5.5 (2.5 ≦ k ≦ 5.5).   The core-sheath composite polyester fiber has a flat cross-sectional shape, and the dimension (L) in one of the two directions orthogonal to each other is 2 to 5 times the dimension (H) in the other direction; The cut pile fabric according to claim 1, wherein the flatness (L / H) expressed as a ratio of these dimensions is 2 to 5.   The cut pile fabric according to claim 2, wherein the cross-section of the core-sheath composite polyester fiber has a flat cross-sectional shape surrounded by an uneven contour line in which convex portions protruding outward and concave portions recessed inward are alternately arranged.

Images