JPH0255535B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for producing polyester false-twisted yarn exhibiting a natural marbled appearance. (Prior Art) Conventionally, a false twisted yarn exhibiting a marbling-like color mix effect is made by aligning a plurality of yarns with different dyeability or hue and performing a false twisting process. However, in such false-twisted yarns, yarns with different dyeability or hue tend to be arranged alternately.
It had the disadvantage of being prone to heathering. In order to eliminate this drawback, Japanese Patent Application Laid-Open No. 156836/1983 proposes that an interlacing treatment be performed before or after the false twisting process, and that additional twisting be performed after the false twisting process and the interlacing process. However, in order to obtain a false-twisted yarn that does not have heathering flow and has a natural marbled appearance, it is necessary to perform additional twisting at a rate of 300 times/m or more, according to experiments conducted by the present inventors. However, it has been found that not only does such additional twisting result in high costs, but also that it is extremely difficult to apply uniform additional twisting. (Object of the Invention) The object of the present invention is to eliminate the drawbacks of conventional methods for producing marbled false twisted yarn, and to produce a false twisted yarn with a natural marbled appearance without additional twisting. Our goal is to provide the following. (Structure) As a result of studies to achieve the above object, the present inventors have found that undrawn or partially oriented yarns having different dyeability are aligned, then subjected to an interlacing treatment, and then subjected to simultaneous stretching and false twisting. However, it has been discovered that the color mixing effect of the resulting false twisted yarn can be improved, and the present invention has been achieved. That is, the present invention provides a polyester multifilament A that is not dyeable with ionic dyes, undrawn or partially oriented, and multifilament A that is dyeable with ionic dyes, the difference in elongation at break being less than 50%. , and an unstretched or partially oriented polyester multifilament B having a birefringence of 25×10 ^-3 or more
After aligning the two, and then interlacing with an interlace nozzle so that the degree of entanglement is 40 strands/m or more,
This is a method for producing marbled polyester false-twisted yarn, which is characterized by carrying out simultaneous stretching and false-twisting at a stretching ratio of 1.2 to 1.8 times. In the present invention, the polyester multifilament that is undyable to ionic dyes refers to polyethylene terephthalate or copolymerized polyethylene terephthalate with a small amount of a third component (for example, isophthalic acid, adipic acid, propylene glycol, etc.) that has no affinity for ionic dyes. A general term for multifilaments made of polyester that are not substantially dyed with ionic dyes such as acid dyes and basic dyes. On the other hand, polyester multifilament dyeable with ionic dyes refers to polyester containing groups dyeable with ionic dyes (e.g. sulfonate groups) in the molecule or polymers dyeable with ionic dyes (e.g. nylon 6). , nylon 66, etc.) or polyester blended with additives, which are well dyed with ionic dyes. As the polyester dyeable with such ionic dyes, copolymerized polyethylene terephthalate containing about 0.5 to 10 mol % of sodium isophthalate-5-sulfonate as an acid component is particularly suitable. In the present invention, an undrawn or partially oriented polyester multifilament A that is undyable to ionic dyes (hereinafter referred to as polyester multifilament A that is undyable to ionic dyes or multifilament A), and the multifilament A
The difference ⁱⁿ cutting ^{elongation from}
An unstretched or partially oriented polyester multifilament B dyeable with ionic dyes (hereinafter referred to as polyester multifilament B dyeable with ionic dyes or multifilament B) is subjected to simultaneous stretching and false twisting. It is necessary to use it as a raw yarn to be subjected to. Here, if the difference in cutting elongation is 50% or more, a large difference in thread length will occur between the filaments during drawing and simultaneous false twisting, and a filament with a large thread density will cover a filament with a small thread density as a core thread. As a result, the resulting false-twisted yarn exhibits heather mottling, and a natural marbling effect cannot be obtained. In addition, if the birefringence of polyester multifilament dyeable with ionic dyes is less than 25×10 ^-3 , fusion will occur during stretching and simultaneous false twisting, so it is difficult to use the resulting false twisted yarn to fabricate woven or knitted fabrics. If this is done, the texture will be rough, which is not good. On the other hand, in the present invention, the birefringence of the polyester multifilament that is undyable with ionic dyes is not particularly limited, but the birefringence is 25×10 ^-3
Since it is necessary that the difference in elongation between polyester multifilament B and dyeable polyester multifilament B is less than 50%, multifilament A
The birefringence of is often 25×10 ^-3 or higher. Even if it is less than 25×10 ⁻³ , polyester multifilament A, which is undyed by ionic dyes, has good heat resistance, so fusion will not occur during stretching and simultaneous false twisting. In addition, multifilaments A and B referred to in the present invention
may each consist of two or more multifilaments. In that case, the difference in cutting elongation is, for example, multifilament A is multifilament
It consists of A ₁ and multifilament A ₂ .
Multifilament B is multifilament B ₁
and multifilament B ₂ , multifilament A ₁ , A ₂ , B ₁ , B ₂
When the difference between the multifilament with the highest cutting elongation and the lowest multifilament among them is less than 50%, that is, the cutting elongation is A ₁ > A ₂ , B ₁ > B ₂ , A ₂ > B ₂ ,
The difference in cutting elongation between A ₁ and B ₂ is required to be less than 50%. Furthermore, in terms of birefringence, both multifilaments _B1 and _B2 , which are dyeable with ionic dyes,
It must be 25×10 ^-3 or more. Next, in the present invention, it is necessary to draw the above-mentioned raw yarns so as to intertwine them using an interlace nozzle so that the degree of entanglement becomes 40 threads/m or more, and then to draw and simultaneously false-twist the yarns. Here, the degree of entanglement applied with the interlace nozzle is 40
If it is less than x/m, the filaments having different dyeability will not be mixed sufficiently, and the resulting false twisted yarn will have heather spots and will not have a natural marbling effect. The degree of entanglement is measured as follows. That is, when the interlaced yarn is floated on the surface of water, the interlaced portions will not open, but the non-entangled portions will open. Utilizing this property, the number of unspread portions per meter of yarn length was measured and determined as the degree of entanglement. In addition, a multifilament that has the cutting elongation and entanglement degree defined in the present invention and is a mixture of filaments with different dyeing properties can be stretched and then false-twisted without being subjected to stretching and false-twisting. If this is done, the resulting false twisted yarn will not have a satisfactory appearance because the constituent filaments will not be sufficiently intermixed. In addition, the stretching ratio in the simultaneous stretching and false twisting process of the present invention is
1.2-1.8 is required. If the draw ratio is less than 1.2, not only will the filaments constituting the resulting false twisted yarn be insufficiently mixed, but also balloons will tend to form due to twisting, and the draw ratio will be lower than 1.2.
If it exceeds 1.8, thread breakage tends to occur. The present invention described above will be explained using the drawings. FIG. 1 is a schematic diagram of a simultaneous stretching and false twisting processing apparatus showing an example of carrying out the present invention. In FIG. 1, polyester multifilament A that is undyable to ionic dyes and polyester multifilament B that is dyeable to ionic dyes, which are unwound from yarn packages 1 and 2, are aligned by a guide 3. It is supplied to an interlace nozzle 6 via a tensor 4 and a pre-overfeed roller 5. The yarns Y thus drawn are entangled with a degree of entanglement of 40 threads/m or more under slight overfeed. Here, the pre-overfeed roller 5 may be omitted and entanglement may be provided between the tensor 4 and the next feed roller 7;
It is preferable to do as shown in FIG. 1 because the entanglement is uniformly applied. Next, the entangled yarn Y is fed to a stretching and false-twisting zone by a feed roller 7, and at the same time as being stretched, it is false-twisted by a false-twisting tool 9, and the twisted yarn is heat-treated by a heater 8. The yarn leaving the false twister 9 is untwisted, passes through a delivery roller 11, and is wound onto a package 13. In addition, as shown in FIG. 1, it is preferable to further apply interlacing using the interlacing nozzle 10 after the false twisting as shown in the figure, since this results in a more natural marbling tone. Further, the false twisting tool 9 shown in FIG. 1 can be any conventionally known one, such as a spindle type false twisting tool, an internal friction type false twisting tool, an external friction type false twisting tool, etc. . The false twisted yarn obtained by the production method of the present invention can exhibit a natural marbled appearance without additional twisting, but it goes without saying that additional twisting may be applied. (Function) In general, the lower the yarn speed, the better the degree of interlacing by the interlace nozzle, and the higher the false twisting tension, the greater the filament migration during false twisting. In this regard, in the manufacturing method of the present invention, the multifilaments having different dyeing are arranged and interlaced in a place where the yarn speed is slow before the drawing and simultaneous false twisting process, and the false twisting tension is further reduced to the drawn yarn. As a result of the false-twisting process, which is performed with a simultaneous stretching and simultaneous false-twisting process that is much higher than the false-twisting process of This results in a false-twisted yarn that can exhibit a certain appearance. (Effects) The polyester marbled false-twisted yarn obtained by the production method of the present invention is a natural marbled yarn without neps or heather spots, and is low in cost since it does not require additional twisting. (Example) Examples 1 to 2, Comparative Examples 1 to 4 Sodium isophthalate-5-sulfonate copolymerized polyethylene terephthalate (dyable with ionic dye) was melt-spun at spinning speeds of 3200 m/min and 1800 m/min and wound. Birefringence of undrawn yarn with birefringence of 25×10 ^-3 and 20×10 ^-3 and polyethylene terephthalate (undyed with ionic dye) were melt-spun at spinning speeds of 3400 m/min and 3100 m/min and wound. 45×10 ^-3 , 35×
10 ^-3 undrawn yarn in the combinations shown in Table 1 using the drawing and simultaneous false twisting device shown in Figure 1, with a pre-overfeed rate of 2% and a compressed air pressure of 2.0 Kg/cm ² G using an interlacing nozzle. (Excluding Comparative Example-1), false twist stretching ratio 1.46 times, heater temperature
Processing was carried out under conditions of 180°C and processing speed of 320 m/min.
The resulting processed yarn was woven as a weft, dyed with ionic dye, and examined for heather mottling, texture, and naps. The results are shown in Table 1. Comparative Example 5 A drawn yarn of 75 de/24 fil of sodium isophthalate-5-sulfonate copolymerized polyethylene terephthalate obtained by a conventional method and a drawn yarn of polyethylene terephthalate of 100 de/48 fil were aligned and heated at a heater temperature of 180°C and a processing speed of 320 m. /min, false twisting magnification
After false twisting at a magnification of 1.0 times, entangling treatment was performed at a compressed air pressure of 2.0 Kg/cm ² G, and evaluation was made in the same manner as in Example-1. Comparative Example 6 The textured yarn obtained in Comparative Example-5 was additionally twisted at 300 T/m and evaluated in the same manner as in Example-1.

[Table] It was possible to do this by winding the package directly onto the package without going through the process.
The value in parentheses is the degree of entanglement of the processed yarn.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of a simultaneous stretching and false twisting machine for carrying out the present invention. 1 is an ionic dye-dyeable polyester undrawn yarn;
2 is an ionic dye-undyed polyester undrawn yarn, 5
is a pre-overfeed roller, 6 is an interlace nozzle, and 9 is a false twister.

Claims (1)

[Claims] 1. An unstretched or partially oriented polyester multifilament A that is undyable with ionic dyes, and the multifilament A that is dyeable with ionic dyes.
After aligning the unstretched or partially oriented polyester multifilament B, which has a difference in elongation at break of less than 50% and a birefringence of 25×10 ^-3 or more, the degree of entanglement is 40 ke/m or more. A method for producing a marbled polyester false-twisted yarn, which comprises interlacing the yarn with an interlace nozzle so that the yarn is interlaced, and then false-twisting it at the same time as stretching at a stretching ratio of 1.2 to 1.8 times.