JPH0718050B2 - Synthetic fiber multifilament with multiple dyeing capabilities - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multifilament composed of synthetic fibers having a plurality of dyeing capabilities, and more specifically, a knitted woven fabric, in particular, a micro irregular dyed knitted woven fabric raw material. The present invention relates to a synthetic fiber multifilament suitable as a yarn.

[Conventional technology]

Conventionally, as a synthetic fiber multifilament dyed in a plurality of colors in the length direction, JP-A-49-518, JP-A-49-31987, JP-B-53-1396,
Those described in JP-B-54-38680 and JP-A-54-6979 are known.

In addition, in the synthetic fiber multifilament, a plurality of types of yarns having different dyeability are combined to form a multicolor dyed yarn,
It is known from JP-B-49-12132, JP-A-55-98930, JP-A-56-63032 and JP-A-54-120762.

[Disadvantages of conventional technology]

In the case of the synthetic fiber multifilament described in JP-A-49-518 and JP-A-49-31987, instead of a single polymer, polymers having different dyeability are alternately arranged in the length direction of the fiber. The fibers arranged in the same direction and composed of the respective polymers repeat at a constant period, and the portions having different dyeing ability do not change irregularly in the cross section of the fiber, and the single cross section in any cross section of the fiber. The parts where the dyeing ability of the single yarn is substantially the same between the yarns, and more than one different polymer is used.
When spinning using one spinning machine, it is difficult to adopt the optimum conditions for each polymer, and when the polymers are switched in a short cycle, each polymer is mixed in the spinning machine and the Since it is difficult to stain differently in the depth direction, the cycle must be long.

Therefore, when a knitted woven fabric is formed by using the synthetic fiber multifilament composed of the above-mentioned fibers, there is a drawback that even if the obtained knitted woven fabric is dyed, it does not become a random pattern and has a certain periodicity. Was.

In the case of the synthetic fiber multifilament described in the above Japanese Patent Publication No. 53-1396, only the surface layer of a hydrophobic fiber containing a basic group or an acidic group is dyed or metadyed, and then the fiber is pressed. By soaking or rubbing treatment, the thickness of the dye-dyed or dye-dyed layer is uneven, and the dye-dyed or dye-dyed layer is peeled off so that the internal untreated layer is partially exposed. Specifically, the peeling of the non-dyeing layer or the non-dyeing layer is performed by a gear, and each single yarn does not become irregular in the portion having different dyeing ability in the length direction,
It becomes regular with the same cycle as the rotation cycle of the gear. Further, there is a drawback that the dyeing ability of the single yarn is substantially the same between the single yarns in the cross section of the synthetic fiber multifilament having portions having different dyeing ability. Further, in the case of the above-mentioned synthetic fiber multifilament, the surface peeling caused by rubbing with a gear causes a large number of scratches on the surface of each single yarn and has a strong strength which causes unevenness in the thickness of the single yarn in the length direction. However, there is a drawback that yarn breakage, especially single yarn breakage occurs frequently.

In the case of the synthetic fiber multifilament described in the above Japanese Patent Publication No. 54-38680, the filaments are deposited in a loop or zigzag shape, and a dyeing solution mainly composed of a dye and a sizing agent is partially adhered to the deposited yarn. The fiber is obtained by coloring at least partially, and although the fibers have irregular portions having different hues in the length direction, each single yarn forming the synthetic fiber multifilament has an entire circumference or outer circumference in each cross section. The parts of different hues do not change irregularly in a part of the, and the cross sections of the parts of different hues of the synthetic fiber multifilament show that the parts of different hues of the single yarns are substantially the same between the single yarns. Has the drawback that

In the case of the yarn described in the above-mentioned Japanese Patent Laid-Open No. 54-6979, the yarn and the transfer paper are superposed and passed through the inside of the transfer machine so that the ink of the transfer paper is soaked in the yarn and transferred to obtain a spot dyed yarn. However, in each single yarn forming the obtained synthetic fiber multifilament, a portion having different hue in each cross section does not change irregularly, and a cross section of the synthetic fiber multifilament having a portion having different hue However, there is a drawback in that the portions where the hues of the single yarns are different are substantially the same between the single yarns.

In the case of the synthetic fiber multifilament described in JP-B-49-12132, JP-A-55-98930, JP-A-56-63032 and JP-A-54-120762,
A multicolor dyed synthetic fiber multifilament obtained by combining a plurality of heterochromatic multifilaments, and each single yarn forming the multifilament is not the same polymer,
Each single yarn does not irregularly distribute portions having different dyeing ability in its length direction, and each single yarn does not irregularly change portions having different dyeing ability in its cross section, and further, synthetic fibers. In any cross section of the multifilament, the portions having different dyeing ability of the single yarn are substantially the same among the single yarns, and in the case of the knitted fabric obtained by using the synthetic fiber multifilament. Due to the difference in heat shrinkage due to the different polymer, only the synthetic fiber multifilament composed of one polymer is exposed on the surface, and substantially only the color of the synthetic fiber multifilament is emphasized. In addition, there are drawbacks such as vertical streaks and color breaks.

That is, in the case of yarns containing the above-described conventionally known synthetic fiber multifilaments, it is common to make a knitted woven fabric, particularly a fine irregularly dyed knitted fabric, in which it is difficult to randomly disperse differently dyed parts. However, it has a drawback that it is difficult to keep the physical properties of the parts having different dyeing ability the same as the physical properties of the other parts.

[Object of the Invention]

It is an object of the present invention to provide a novel synthetic fiber multifilament having a plurality of dyeing capabilities, which solves the above-mentioned drawbacks of the prior art.

[Structure of Invention]

According to the constitution of the present invention, in a synthetic fiber multifilament having a plurality of dyeing ability, each single yarn forming the synthetic fiber multifilament is made of the same polymer, and A. each single yarn has different dyeing ability in the length direction. The parts are irregularly distributed, B. Each single yarn has irregular changes in the part with different dyeability in each cross section, and C. Cross section of synthetic fiber multifilament having parts with different dyeability. In terms of surface, the single yarns have substantially different dyeing ability.

It is a synthetic fiber multifilament having a plurality of dyeing capabilities.

The novel synthetic fiber multifilament of the present invention is a synthetic fiber multifilament lump, which is prepared by first drawing a synthetic fiber made of the same polymer and then introducing it into a dyeability conversion processing device, and performing defibration indentation by turbulent gas to deposit it. And nothing,
A solution of a modifier capable of reacting with the terminal groups of the polymer and converting the dyeing ability of the polymer is attached to part or all of the outer circumference of the synthetic fiber multifilament mass. As the modifying agent, for example, an end group increasing agent, an end group blocking agent, an end group converting agent that blocks an end group to form another terminal group is used, and if necessary, in addition to these modifying agents, a dyeing auxiliary agent Is mixed in.

The synthetic fiber multifilament lump to which the modifier is attached is unwound to form a linear synthetic fiber multifilament,
Then, secondary stretching is performed, and heat treatment is performed between the application of the modifier and the end of secondary stretching.

The present invention will be described in detail with reference to the drawings. 1 to 4 are cross-sectional views of the synthetic fiber multifilament according to the present invention, FIG. 5 is a schematic front view showing a manufacturing process of the synthetic fiber multifilament according to the present invention, and FIG. FIG. 7 is a schematic vertical sectional view of the yarn treating apparatus in the figure, and FIG. 7 is a schematic vertical sectional view showing a state in which the synthetic fiber multifilament according to the present invention is manufactured using the apparatus shown in FIG.

Each of the single yarns y1 to y10 forming the novel synthetic fiber multifilament having a plurality of dyeing capabilities according to the present invention shown in FIGS. 1 to 4 is a multifilament made of the same polymer having 144 single yarns. Ten single yarns were arbitrarily extracted from the inside, and the extracted 10 single yarns y1 to y10 were dyed only at portions having different dyeing ability, and the portions cut at 1 cm intervals were micrographed. It is a copy based on this.

As shown in FIGS. 1 to 4, each single yarn y1 to y10 forming the synthetic fiber multifilament according to the present invention.
Are irregularly distributed in the dyeing ability portion n of the polymer itself, which is displayed in white in the length direction, and the portions u having different dyeing ability, which are indicated by black dots, are randomly distributed. In the cross section of the synthetic fiber multifilament in which the portions u having different dyeing capacities are irregularly changed in the plane, and the portions having different dyeing capacities are provided as shown in FIGS. 1, 3, and 4. Various yarns y between y1 to y10
The portions u having different staining abilities of 1 to y10 are substantially different.

The method for producing the synthetic fiber multifilament according to the present invention shown in FIGS. 1 to 4 will be described in detail with reference to FIGS.

A yarn Y made of a synthetic fiber obtained by spinning the same polymer from the spinning machine 1 is cooled by a cooling device 2 and then contacted with an oiling roller 3 to apply a spinning oil agent to the take-up roller 4
To wind. Next, after being wound around the stretching roller 5 and subjected to the primary stretching, it is cooled by the rotary drum 7 through the dyeability conversion processing device 6, wound around the yarn block unwinding pin 8 and the yarn block unwinding roller 9, and then After being wound around the stretching rollers 10 and 11 and stretched, it reaches the winding device 12 and is wound on the bobbin 13. K1 is the primary unwinding area,
K2 is the secondary unwinding area, and K3 is the tertiary unwinding area.

The above-mentioned conditions of spinning, drawing, and unwinding of the yarn aggregate are selected according to the strength, elongation, boiling water shrinkage, etc. of the synthetic fiber multifilament to be obtained.

Regarding the method of continuously performing the dyeability conversion processing on the yarn Y using the dyeability conversion processing apparatus 6, the processing is performed in the order shown in FIG. 7 using the apparatus shown in FIG. The linear yarn Y1 that has been spun and drawn is guided to the dyeability conversion processing device 6,
It is introduced from the yarn introducing section 14, is defibrated by the heating turbulence processing section 15, and is deposited on the accumulation section 16.

The straight yarn Y1 is a heating turbulence processing unit 15 and a heating compressed fluid introduction unit.
The yarn is defibrated by the heated compressed fluid introduced in the direction of arrow A from 17 and a part of the yarn is entangled to form the opened yarn Y2, and subsequently the accumulated yarn Y3 previously deposited in the depositing portion 16 by the heated compressed fluid. The piled up yarn is Y3.

The heated compressed fluid uses the spread yarn Y2 as the piled yarn Y3 and then passes through the slit 20 formed by the slit regulating ring 19 provided between the plurality of donut plates 18 and from the heated compressed fluid discharge portion 21 in the direction of arrow B. Is discharged to.

The accumulated yarn Y3 is accumulated in the accumulating unit 16 and is transferred to the treatment agent applying unit 22 in the state of a columnar mass, that is, a accumulated yarn mass.
In the treating agent applying section 22, the treating agent introduced from the treating agent introducing section 23 in the direction of the arrow C is passed through the slit 20 formed by the donut plate 18 and the slit regulating ring 19 to the outer periphery of the accumulated yarn Y3 that has become the accumulated yarn mass. An aqueous solution of a blocking agent that blocks the end groups of the polymer or / and a dyeing aid that reacts the end groups of the polymer is sprayed from part or all of the circumference to form the treated yarn mass Y4.

The treated yarn mass Y4 moves to the treatment agent fixing portion 24, and the heating fluid introduced from the heating fluid introducing portion 25 in the direction of the arrow D is passed through the slit 20 formed by the donut plate 18 and the slit regulating ring 19 to the treatment yarn. The treatment agent applied in the treatment agent application section 22 is heat-fixed by spraying heat treatment around the filament block Y4 to form the treatment agent-fixed yarn block Y5. The heating fluid which comes into contact with the treated yarn mass Y4 through the slit 20 introduced from the heating fluid introduction part 25 and the surplus heating fluid which does not come into contact with the treated yarn mass Y4 are discharged from the heating fluid discharge part 26 in the arrow E direction. To be done.

The treatment agent-fixed yarn mass Y5 passes through the yarn discharge part 27 and is led out from the dyeability conversion processing device 6 to become a cylindrical yarn mass Y6, which is placed on the rotary drum 7 which rotates in the direction of arrow F. Use to move in the direction of arrow F.

The columnar yarn block Y6 is unwound before and after it is placed on the rotary drum 7, that is, a part of the block is unwound in the primary unwinding region K1 to become the primary unwound yarn Y7.

As shown in FIG. 5, the primary unwinding yarn Y7 is pulled by the yarn lump unwinding roller 9 via the yarn lump unwinding pin 8 and before and after being separated from the rotary drum 7, that is, in the secondary unwinding region K2. The secondary unwound yarn Y8 becomes a third unwound yarn Y9 having no lump between the yarn block unwinding pin 8 and the yarn block unwinding roller 9.

The third untwisted yarn Y9 is then wound around heated heating rolls 11 and 12 and stretched to reduce or eliminate the flexibility caused by buckling at the depositing portion 16 and improve the strength. The new synthetic fiber multi-filament Y10 becomes a winding device 12 and is wound on a bobbin 13.

The primary unwinding yarn Y7, the secondary unwinding yarn Y8, and the tertiary unwinding yarn Y9 are as shown in FIG. 8, and the black dot display portion u in FIG. The white portion n represents a portion having a dyeing ability which the polymer itself had before being spun in a spinning machine without a treatment agent.

The synthetic fiber multifilament 10 is deposited in a state in which each single yarn is randomly opened and partly entangled in the treatment agent applying unit 22 in the dyeing ability conversion processing device 6, and is further buckled irregularly. Of the synthetic fiber multifilament 9 of the present invention having a novel partial metachromaticity due to the presence of extremely irregular portions u having different dyeing abilities by the treatment agent being applied from the outer periphery in the form of a columnar lump. Is obtained.

As the treatment agent applied by the treatment agent applying section 22, when the synthetic fibers subjected to crimp dyeing ability conversion processing are polyamide fibers,
For example, one represented by the following formula is used.

When a polyamide fiber is treated with a treating agent composed of the compounds of the above formulas (1) and (2), the treated part of the polyamide fiber is not dyed with an anionic dye or becomes a light dyeing depending on the amount of the treating agent applied, The part to which the treatment agent is not attached is dyed. On the other hand, a portion to which the treatment agent is applied is deeply dyed with respect to the cationic dye, and a portion to which the treatment agent is not adhered is not dyed to cause a color tone difference.

In the case of the compounds represented by the above formulas (3) and (4), the portion to which the treatment agent is applied is deeply dyed with respect to the anionic dye, and the portion to which the treatment agent is not applied is lightly dyed to cause a color tone difference.

It is possible to obtain fibers having different dyeing ability by selecting a modification treatment agent that adds a sulfone compound to a polymer for obtaining polyamide fibers to form a cationic dye-dyable polyamide or polyester fibers. It is possible, and by dyeing the obtained fibers, fibers having a color difference can be obtained at random.

28 in FIGS. 6 and 7 is a support member, 29, 30,
Reference numeral 31 is a spacer, 32 is a partition plate provided between the deposition section 16 and the treatment agent applying section 22, and 33 is a fastening ring for fixing the partition plate 32. Reference numeral 34 is a partition plate provided between the processing agent applying section 22 and the processing agent fixing section 24, and 35 is a fastening ring for fixing the partitioning plate 34. Reference numeral 36 is a support plate, and 37 is a fastening ring for fixing the support plate 36.

Pressurized heated steam is used as the heated compressed fluid introduced from the heated compressed fluid introducing unit 17.

The heating fluid introduced from the heating fluid introducing section 25 is preferably saturated steam or pressurized heating steam. This prevents the treatment agent attached to the outer periphery of the treated yarn mass Y4 from adhering to the donut plate 18, the spacer 31 or the like, and can surely make the treated yarn mass Y4 the treatment agent fixed yarn mass Y5. Because.

Although each single yarn forming the thermoplastic synthetic fiber multifilament having a plurality of dyeing ability obtained by the method according to the present invention is the same polymer, portions having different dyeing ability are randomly distributed in the length direction. In addition, in each cross section, the portions having different dyeing ability are irregularly changed, and the single yarns having the portions having different dyeing ability of the synthetic fiber multifilament are mixed. Has the chemical property that the different dyeing ability of each single yarn is substantially different from each other. In addition, it has the different dyeing ability and the dyeing ability of the polymer itself. The boiling water shrinkage rate of the whole synthetic fiber multifilament including the part is in the range of 2.0 to 13%, and the elongation has a physical property of being in the range of 20 to 50%. The polymer itself The boiling water shrinkage, strength and elongation are substantially the same as those with dyeing ability, and even if strict measurement is performed to find a minute difference, the area with different dyeing ability is minute and extremely irregular. Since they exist, the physical properties are substantially the same.

〔Example〕

Examples 1 to 7 and Comparative Examples 1 and 2 Using the apparatus shown in FIG. 5, nylon 6 polymer was spun out from a spinning machine, cooled with a cooling device, and an undrawn yarn obtained by applying a spinning oil agent was obtained. Then, after the primary drawing, the yarn is made into a high-strength yarn, and then the dyeing ability conversion treatment device shown in FIGS. 6 and 7 is used to apply the treatment agent from the outer periphery in the state of irregular buckling and accumulation. After forming into a yarn block, the treated yarn block was sequentially unwound to form a linear shape, then secondarily stretched, and the refraction added by the buckling accumulation was unwound and wound by a winder. .

As the treatment agent of the dyeability conversion device, An aqueous solution of a compound represented by The treatment conditions and the properties of the obtained synthetic fiber multifilament were as shown in Table 1.

In Comparative Examples 1 and 2, a sizing agent was mixed with the above treatment agent and used.

The boiling water shrinkage rate in Table-1 Ask in. Here, 1 is about 50 not treated with boiling water
The synthetic fiber multifilament of cm is subjected to a constant load of 100 mg / d for 30 seconds, and l2 is 1, and the synthetic fiber multifilament is immersed in boiling water for 30 minutes without load, and then 5 It is the length after 30 seconds have elapsed after applying a constant load of 100 mg / d to the one that has been air-dried for more than an hour.

In the case of Comparative Examples 1 and 2 in Table-1, since the treatment agent glue was mixed, the treatment agent adhered to the slits in the treatment agent application part and the treated yarn mass and the spacer and the inner peripheral surface of the partition plate adhered to each other. The treated yarn mass could not be discharged from the dyeability conversion treatment device, and continuous treatment was impossible.

Seat belts for passenger cars were obtained using the synthetic fiber multifilaments obtained in Examples 1 to 7 in Table 1, and then acid dyes (Kayanol Navy Blue R; 0.2% OWF) and basic dyes (Cathiron Yellow; One-bath multicolor dyeing was performed using an aqueous solution (bath ratio: 1: 100) of 0.08% OWF) and a dyeing aid (monosodium phosphate; 4.7% OWF, disodium phosphate; 1.18% OWF).

The colored carpet obtained was a rugged seat belt in which extremely small spots of yellow were irregularly scattered in blue and had no similar pattern, vertical streaks, or moire phenomenon.

The seat belts woven using the synthetic fiber multifilaments obtained under the conditions of Examples 1 to 7 have blue, yellow, yellow-green, blue-green, and other micro-dyed portions scattered, and are A complex color pattern was observed.

Examples 8 to 14 and Comparative Example 3 Using the apparatus shown in FIG. 5, the nylon 6 polymer was spun from the spinning machine, cooled with a cooling device, and the undrawn yarn obtained by applying the spinning oil agent was drawn. Then, after the primary drawing to make a high-strength yarn, the dyeing ability converting device shown in Figs. That is, the treated yarn mass was sequentially unwound to form a linear shape, then secondarily stretched, and the refraction added by the buckling accumulation was unwound to be wound by a winder.

As the treatment agent of the dyeability conversion device, An aqueous solution of a compound consisting of

The treatment conditions and the characteristics of the synthetic fiber multifilament are shown in Table 2. In Comparative Example 3, a sizing agent was mixed with the above treatment agent and used.

In the case of Comparative Example 3 in Table-2, since the treatment agent was mixed with the glue, the treatment agent was fixed to the slit in the treatment agent applying section, and the treated yarn block and the spacer and the inner peripheral surface of the partition plate were fixed to each other. The agent-fixed yarn mass could not be discharged from the dyeability conversion treatment device, and continuous treatment was impossible.

A seat belt was obtained using the synthetic fiber multifilaments obtained in Examples 8 to 14 in Table 2, and then an acid dye (Kayanol Navy Blue R; 0.2% OWF) and a dyeing aid (monosodium phosphate; 4.2% OWF, disodium phosphate; 1.05% OWF) in water (bath ratio: 1: 100)
Bath dyeing was performed.

As a result, the seat belts woven using the synthetic fiber multifilaments obtained under the conditions of Examples 8 to 14 have small spots of dark blue and slightly dark blue in the blue color, and irregular micro-dyed portions are irregular. A complex color pattern having a quasi-tone was observed without any similar pattern, vertical stripes, moire phenomenon, etc. [Effect of the Invention] According to the synthetic fiber multifilament of the present invention, the same polymer is multi-dyed. When used for seat belts, etc., the dyeability in the length direction between single yarns and in the single yarns is different. It is capable of forming a rugged pattern.

Further, according to the method of the present invention, it is possible to obtain a multi-dyeing synthetic fiber multifilament using the same polymer without using a plurality of spinning devices, and to perform another step before weaving into a seat belt or the like. It has the effect of being able to obtain multi-dyeing synthetic fiber multi-filament without dyeing processing of multiple colors, and has the productivity and workability as well. It was the same as the fiber multifilament.

Further, in the practice of the method of the present invention, a portion of the conventional jet stuffer nozzle is modified so that the end groups of the single polymer forming the synthetic fiber can be blocked, increased, or converted to other end groups. It suffices to provide a means for supplying one or more treatment agents selected from the above and heat fixing means for the treatment agents, and the novel synthetic fiber multifilament can be obtained by a very simple novel method. .

[Brief description of drawings]

The drawings are all related to the present invention and are shown in FIGS.
FIG. 5 is a cross-sectional view of the synthetic fiber multifilament of the present invention, and FIG. 5 is a schematic front view showing a process for producing the synthetic fiber multifilament shown in FIGS. 1 to 4. Sixth
FIG. 7 is a schematic vertical cross-sectional view of the dyeability conversion processing device in FIG. 5, and FIG. 7 is a schematic vertical cross-sectional view showing a state in which the synthetic fiber multifilament of the present invention is manufactured using the device shown in FIG. . FIG. 8 is a perspective view showing a state in the manufacturing process of the synthetic fiber multifilament according to the present invention. 1 ... Spinning machine, 2 ... Cooling device, 3 ... Oiling roller, 4
... Take-up roller, 5 ... Stretching roller, 6 ... Dyeing capacity converting device, 7 ... Rotating drum, 8 ... Yarn lump unwinding pin, 9 ... Yarn lump unwinding roller, 10, 11 ... Stretching roller, 12 ... Winding device, 13
… Bobbin, 14… Thread introduction part, 15… Heating turbulence treatment part, 16…
Deposition part, 17 ... Heated compressed fluid introduction part, 18 ... Donut plate, 19
... Slit restriction ring, 20 ... Slit, 21 ... Heating compressed fluid discharge section, 22 ... Treatment agent applying section, 23 ... Treatment agent introducing section, 24 ...
Treatment agent fixing part, 25 ... Heating fluid introducing part, 26 ... Heating fluid discharging part, 27 ... Thread discharging part, 28 ... Support member, 29, 30, 31 ... Spacer, 32, 34 ... Partition plate, 33, 35, 37 ... Fastening ring, 36 ... Support plate, Y ... Yarn, Y1 ... Straight yarn, Y2 ... Opened yarn, Y3 ... Stacked yarn, Y4 ... Treated yarn mass, Y5 ... Treatment agent fixed yarn mass, Y6 ... Cylindrical yarn block, Y7 ... primary unraveling yarn, Y8 ... secondary unraveling yarn, Y9 ... tertiary unraveling yarn, K1 ... primary unraveling region, K2 ... secondary unraveling region, K3 ... tertiary Unrolling area, u ... Staining capacity conversion part, n ... Staining capacity non-conversion part, y1
~ Y10 ... Single yarn.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location D06P 5/00 103 9356-4H (56) Reference JP-A-55-98930 (JP, A) Special features JP-A-56-63032 (JP, A) JP-A-54-120762 (JP, A) JP-B-49-12132 (JP, B1) JP-B-55-23927 (JP, B2)

Claims (1)

[Claims] 1. A synthetic fiber multifilament having a plurality of dyeing ability, each single yarn forming the synthetic fiber multifilament is made of the same polymer, and A. each single yarn has a different dyeing ability in its length direction. Are irregularly distributed, B. Each single yarn has irregularly changed portions with different dyeability in each cross section, and C. Cross section of synthetic fiber multifilament having portions with different dyeability The synthetic fiber multifilament having a plurality of dyeing capabilities, characterized in that the parts having different dyeing capabilities of the single yarns are substantially different from each other.