JPS6131217B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to improving the black depth of processed polyester yarn. Among synthetic fibers, polyester generally does not produce vivid colors, and although various attempts have been made to improve its dyeability, the level of achievement has not yet been satisfactory, especially when it comes to black. It does not have a deep flavor and is significantly inferior to natural fibers such as wool and silk. Furthermore, there are problems in that black is the most difficult to dye among various hues, the dyeing process itself consumes a large amount of energy, and the color fastness of the dyed object is low. The object of the present invention is to improve the above-mentioned drawbacks of black dyed polyester, and to provide a black polyester that is energy-saving, has a deep taste, and is strong. As a result of intensive research aimed at achieving the above object, the present inventors have developed a false twisted two-layer structure yarn consisting of a core yarn and a sheath yarn using polyester filament yarn colored with carbon black as a raw material. The present invention was achieved by investigating the fact that an extremely deep black color can be obtained when the applied state is alternately reversed substantially continuously. Thus, according to the present invention, in a two-layer structure yarn in which one of at least two kinds of filament yarns that has been subjected to a false twist crimp process is used as a core yarn and the other filament yarn is wound around it, Although some of the filaments constituting the attached yarn are randomly mixed and intertwined with the filaments of the core, the wound yarn as a whole is wound around the core yarn in a substantially continuous alternating manner, and at this time, the core Provided is a false-twisted two-layer structured yarn exhibiting a deep black color, characterized in that both the yarn and the wound yarn are black spun-dyed yarn containing carbon black. An embodiment for obtaining a two-layer structured yarn of the present invention will be explained with reference to FIG. 1. Two yarns 1 and 2, which are both spun-dyed in black and have different elongations, are combined by a guide 3 and then the tension is adjusted. The yarn is fed through a device 4 and a feed roller 5 to an air jet nozzle 6 for mixing and entangling, where it is turned into an entangled yarn having 20 or more interlacing points. Next, this intertwined yarn is supplied to a drawing false twisting zone by a first delivery roller 7, passes through a heater 8 and a false twisting tool 9, is taken off by a second delivery roller 10, and is wound up as a cheese 11. As shown in Figure 2, the false twisted two-layer structured yarn obtained in this way has the wound yarns wound in a continuous inverted alternate twist pattern, and the wound yarns are wound around the yarn axis at extremely short pitches. A state is obtained in which the lines alternately intersect in opposite directions,
Furthermore, the winding condition is relatively loose and the voids within the yarn are large. Furthermore, the wound yarn has the characteristic that it is not completely drawn. The reason why the processed yarn of the present invention, which is made of black dope-dyed yarn containing carbon black, exhibits a deep black color that cannot be obtained with conventional processed yarns is due to the random change in the direction of light reflection due to the change in the twist direction at the minute pitches mentioned above. It is presumed that this is due to the randomization of light reflection due to the interaction between the yarn voids and the disordered single fibers (sheath yarn), and furthermore, the reflected light disappears due to repeated reflections within the yarn. As described above, the present invention was made by paying attention to the optical behavior of the sheath yarn in the false-twisted two-layer structured yarn in order to obtain the bathochromic effect. In this respect, the conventionally obtained alternately twisted two-layer structure yarn, that is, the yarn is twisted in the same direction and wound several times, then reversed and twisted in the opposite direction, wound several times, and then repeated. In the case of a tightening structure,
Since there is no microscopic change in the twist direction and the fibers are wrapped in tight bundles, randomization of light reflection as described above cannot be expected, and the yarn is not much different from general processed yarn, and is therefore applied in the present invention. Not done. On the other hand, in the combination of two or more types of filaments in the present invention, a yarn that can be false-twisted at least under the underfeed is used as the yarn with lower elongation, and the yarn with higher elongation is used as the yarn that can be false-twisted under the underfeed. 100 more
% or more is used. Most preferably, the yarn with lower elongation is a partially oriented filament yarn with an elongation of 100% or more and a draw ratio of 1.4 times or more can be adopted, and the yarn with higher elongation is 250%.
Use a combination with undrawn yarn exceeding . Furthermore, in the present invention, the term "filament yarn" refers primarily to polyethylene terephthalate, but it may also be one copolymerized with a third component in a proportion of 15 mol% or less. Further, the polyester may contain additives such as a matting agent, a coloring agent, and a twist retardant. Further, although the undrawn yarn and the partially oriented yarn may have the same filament cross-sectional shape, content of matting agent, presence or absence of colorant, etc., at least any of these may be different. Further, in order to obtain a black doping effect, carbon black may be used in an amount of 1 to 5%, preferably about 3%. Further, copper phthalocyanine blue or the like may be added to adjust the black tone. In this case, a yarn with a polygonal cross-section of pentagon or more is used for the black spun-dyed yarn, and the surface of the single fiber constituting the wound yarn of the obtained processed yarn is divided into polygons by the ridge lines along the fiber axis, making it even more transparent. It is also preferable to randomize the reflections. Furthermore, it is preferable to reduce the amount of alkali to give unevenness to the fiber surface. The colored yarn thus obtained exhibits a deep hue and improves the visual density, but in order to further enhance this effect, a hydrophobic polymer having a refractive index lower than that of the fiber, such as polytetrafluoroethylene, is used. It is also useful to form a thin film of tetrafluoroethylene-propylene copolymer, polyfluoroethyl arylate, polydimethylsilane, polydimethylsiloxane, etc. on the yarn surface. In this case, the thin film of the above-mentioned polymer may be applied to the yarn by applying an emulsion or suspension of the polymer and then being dried. As described above, the present invention provides a deep black fiber material by omitting the dyeing process that consumes a large amount of energy. Example Elongation obtained by spinning at a speed of 3300 m/min
Polyester filament yarn (118de/24fils) containing 112% and 3% carbon black and speed
Elongation 335 obtained by spinning at 1350m/min
% and polyester filament yarn (225 de/72 fils) containing 3% carbon black were aligned and subjected to interlacing treatment and stretch false twisting in the steps shown in FIG. Using an interlace nozzle, 65 entanglements/m were applied at an overfeed rate of 1.5% and a compressed air pressure of 4 Kg/ ^cm3 , followed by a stretching ratio of 1.56 times and a heater temperature.
170°C, surface speed of friction false twisting device 720 m/min, second delivery roller speed 360 m/min (i.e.
Vr/Vy=2.0), the running angle of the yarn was 21.4, and the K value [untwisting tension T ₂ /twisting tension T ₁ ]=0.9. The processed yarn thus obtained had a yarn structure as shown in FIG. It was made into a textile. As can be seen from the comparison with the conventional black spun-dyed yarn fabric, a deep black color was obtained.

[Table] Note) The smaller the L value, the deeper the flavor.
Visually, a level 5 level of whiteness is recommended.
As described above, according to the processed yarn of the present invention, it is possible to obtain a polyester processed yarn that is energy-saving, durable, and has a deep black color.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment for obtaining the processed yarn of the present invention, and FIG. 2 is a side view of the processed yarn of the present invention. In Fig. 1, 1, 2: yarn, 3: guide,
4: Tension device, 5: Feed roller, 6: Interrail nozzle, 7: First delivery roller, 8:
heater, 9: false twister, 10: second delivery roller, 11: winding cheese In Fig. 2, 12: core yarn, 13: winding yarn,
It is.

Claims (1)

[Claims] 1. In a double-layered yarn made of at least two types of filament yarns that have been subjected to a false twist and crimp process, one of which is used as a core yarn and the other filament yarn is wound around it, the filaments constituting the wound yarn are Although some of the yarn is mixed and intertwined randomly with the filaments in the core, the entire winding yarn is wound around the core yarn in a substantially continuous alternating manner, and at this time, both the core yarn and the winding yarn are coated with carbon black. A false-twisted two-layer yarn that exhibits a deep black color and is characterized by being made of black spun-dyed yarn containing black dyed yarn.