JPS5831416B2 - Polyester bulk “Dakashi” - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyester bulky yarn, and more specifically, to a polyester bulky yarn that has excellent bulkiness and entanglement strength, as well as a uniform marbling tone after dyeing. be.

In recent years, various types of yarns have been developed for the purpose of adding caloric value to fibers, and marbled yarns are one of them.

However, methods for producing thermoplastic multifilament bulky yarn with a marbling tone include combining different types of yarns, blending yarns,
It is generally well known to carry out a crimp process, or to crimp different types of yarns and then combine or twist them together.

However, these methods are expensive and tend to cause unevenness in quality, resulting in so-called heathering and sink marks, making it impossible to obtain bulky yarn with a good marbled finish.

As a method to compensate for these shortcomings, Japanese Patent Application Laid-Open No. 50-6325
No. 0 discloses a method in which two types of yarns with different dyeability are false-twisted and then treated with fluid turbulence.

However, according to the inventors' study, when bulky yarns that have been crimped by false-twisting Karoe are treated with fluid turbulence in an excessively supplied state, the yarns open due to the crimping properties of iron-based materials. Because each unit constituting the iron system is disturbed separately and independently, it is more likely that a mutually intertwined structure is formed between the single yarns than in the treatment of non-folded yarns, making it impossible to achieve a sufficient Caloe effect. understood.

In other words, with conventional processing techniques, it has not been possible to obtain a polyester bulky yarn that exhibits a uniform marbling tone and has both excellent bulkiness and entanglement strength.

The present inventors conducted studies aimed at solving the drawbacks of such conventional marbled yarns, and as a result, they arrived at the present invention.

That is, the present invention provides a polyester multifilament that is undyable with ionic dyes (hereinafter referred to as F1) and a polyester multifilament that is dyeable with ionic dyes (hereinafter referred to as F2) whose intrinsic viscosity is at least 0.04 smaller than Fl.
Polyester is a bulky yarn in which minute loops are formed by fluid turbulence mixed at a weight ratio of Fl: F2 = 1: 4 to 4:1, and whose entanglement strength is 0.8 g/d or more. It is a bulky yarn.

The mixing ratio of multifilament F1 and multifilament F2 constituting the polyester bulky yarn of the present invention needs to be 1=4 to 4:1 in terms of weight ratio in order to obtain a stable color tone in the marbled yarn after dyeing. There is, 1:3~3
:1 is more suitable.

Further, in the bulky yarn according to the present invention, the intrinsic viscosity of the multifilament F2 constituting the iron system is the multifilament F1.
0.04, more preferably 0.06 smaller, and a minute loop is formed by fluid turbulence, so the entanglement strength value defined below is 0.8 g/d or more, more preferably It becomes 1.0 g/d or more.

If the entanglement strength is less than o.sg/ct, the entanglement will come loose due to the tension applied during the unwinding process, weaving process, and knitting process from the package, which is not preferable.

A preferred manufacturing method for obtaining the above-described bulky yarn of the present invention includes a polyester multifilament F1 that is undyable with ionic dyes, and a polyester multifilament F1 that is dyeable with ionic dyes and has an intrinsic viscosity that is at least 0.04 smaller than that of the multifilament F1. polyester multifilament F2 and F, :F2=4
This is a manufacturing method in which the fluid is supplied in a relaxed state to a fluid turbulent region at a weight ratio of ~4:1, and loops and entanglements are formed by the fluid turbulence.

Here, the method for manufacturing the bulky yarn of the present invention described above will be explained in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing a preferred step of the bulky yarn manufacturing method of the present invention, in which a multifilament 1 (F1) and a multifilament 2 (F2) are fed through a tensor 3 that suppresses fluctuations in unwinding tension. It is supplied to roller 4.

Next, the yarn is subjected to fluid turbulence treatment by a fluid turbulence nozzle 6 in a relaxed state between the yarn feeding roller 4 and the take-up roller 7, and the two types of multifilaments are mixed, forming loops and entanglements, and being wound into a winder 8. It will be done.

Note that when a moisture imparting device 5 is provided in front of the nozzle 6 and moisture is imparted to the yarn, the yield point stress (entanglement strength) of the S-8 curve of the resulting bulky yarn increases, and the loops in the length direction of the yarn increase. This is preferable because it improves the uniformity of the process.

The entanglement strength of the bulky yarn obtained by the above method is 0.8 g /
In order to make it more than d, the supplied multifilament F
1 and multifilament F2 need to have a specified difference in intrinsic viscosity.

Although the reason for this is not necessarily clear, it is presumed to be based on the following effect.

That is, when a multifilament is placed under the disturbance effect of fluid turbulence, the multifilament opens, twists, or forms a loop, resulting in a complex entangled structure.

In this case, if two types of multifilaments with specific differences in intrinsic viscosity are used, the single fibers of multifilament F1, which has a higher intrinsic viscosity, will have less momentum under turbulence because the rigidity modulus against bending and twisting of the single fibers is different. It is thought that this is because the single fibers of the multifilament F2, which form a small number of large loops and have a large momentum under the airflow, become entwined with the single fibers of the F1 and form minute loops, which has the effect of fixing the large loops.

When the ionic dye-impossible multifilament F1 and the ionic dye-dyeable multifilament F2 are subjected to fluid turbulence treatment in the same relaxed state as shown in FIG.
After the fibers 2 are opened, they mix together to form loops and entanglements, resulting in a bulky yarn in which each single yarn is unevenly dispersed.

Therefore, Fl and F2 do not exist as a group by themselves, and when the bulky yarn is dyed, it becomes a good marbled bulky yarn that does not cause heathering or sink marks.

As explained above, the bulky yarn of the present invention is one in which the multifilament L-F and the multifilament F2 are opened and the single yarns are dispersed to form loops and entanglements.
There is virtually no broken single thread fuzz.

Although there is no fluff with broken single yarns, the loops exhibit the same appearance and bulking effect as fluff.

It is also possible to feed the multifilaments F1 and F2 to separate yarn feeding rollers and to perform the fluid turbulence treatment at the same time in different relaxation states.

In this case, the yarn with a low relaxation rate constitutes a relatively central part of the bulky yarn, and the yarn with a high relaxation rate covers the center of the bulky yarn to form a loop or entanglement, so that the entanglement strength is increased. improves.

Furthermore, the yarn with a low relaxation rate at the center of the obtained bulky yarn is visible from the gap between the yarns with a high relaxation rate covering it, and neither of the yarns is present as a whole in the length direction or the cross-sectional direction.

Therefore, even when the bulky yarn is dyed, no heathering or sinking occurs, and an extremely good marbling effect is exhibited.

However, since multiple yarn feeding rollers are used, the operation and equipment must be complicated, and unless a special yarn form is desired, multifilament F is used.

It is preferable to supply F2 and F2 to one yarn feeding roller and process them in the same relaxed state.

In the process shown in Fig. 1, if the Fl and F2 multifilaments are already mixed or aligned, they should be fed as they are to the roller 4, and the rollers before and after the fluid turbulence nozzle should be set at a relaxation rate. In order to achieve this, a difference is given to the circumferential speeds, but it is also possible to employ means such as using a large diameter portion and a small diameter portion of one stepped roller as a method of giving a difference in circumferential speed.

If the multifilaments F and F2 are already mixed, it is preferable that the fibers have a more uniform marbling tone than when they are not mixed.

The mixing ratio of the multifilaments F1 and F2 supplied in the present invention needs to be 4 to 4:1 by weight in order to achieve the desired marbling effect after dyeing.
:3 to 321 is more preferable.

Polyester multifilament l-F undyable to ionic dyes used to obtain the polyester bulky yarn of the present invention
, is a polyester that does not have an ionic dye dyeing site in its molecule, and is a polyester multi-layer mainly made of polyethylene terephthalate, polybutylene terephthalate, poly(p-ethoxybenzoate), or copolymers containing these as main components. A general term for filaments.

On the other hand, polyester multifilament F2 dyeable with ionic dyes is a sheath-core type composite polyester fiber with a sheath of an ionic dye dyeable polymer such as nylon, a blend fiber of nylon and polyester, or a metal salt form. A general term for polyester multifilaments that can be dyed with ionic dyes directly or using an auxiliary agent, such as polyester threads with improved dyeability that have sulfonate groups on the main chain or ends of the polyester.

The multifilaments t-F and F2 may contain known modifiers such as pigments, antistatic agents, and flame retardants within the range that does not impede the effects of the present invention. The cross-sectional shape is not limited to round or irregularly shaped cross-sections.

When using the multifilaments F1 and F2, a fine denier multifilament is preferable from the viewpoint of increasing the entanglement strength of the bulky yarn obtained.

For this reason, the single yarn fineness of the multifilament is preferably 3.2 d or less, more preferably 2.1 d or less, and may be a denier mixed yarn or a mixed yarn with different cross-sectional shapes.

The total number of filaments is preferably 20 or more, more preferably 24 or more.

The proportion of the multifilament F2 in the total number of filaments is preferably 20 to 80%, more preferably 30 to 70%.

In order to increase the bulkiness of the bulky yarn obtained by the present invention, sufficiently increase the entanglement strength to 0.8 g/d or more, and provide a uniform marbling tone, the overfeed rate when processing the multifilament in a fluid turbulence region is is preferably 10 to 50%, and 12
~40% is more preferable, and the pressure of the fluid supplied to the fluid turbulence nozzle is preferably 4Kt/1 (G) or more, and 5Ky/
ff1 (G) or more and (fluid pressure (Ky/cri)
) / (Yam feeding speed to fluid turbulence nozzle (m/1ni
The square root of n) is more preferably 0.27 or more.

The polyester bulky yarn of the present invention has two characteristics: (1) the ionic dye-undyable multifilament and the ionic dye-dyable multifilament are well mixed, and a uniform marbling effect is exhibited by dyeing; (2) fluid turbulence; Loops and tangles are formed through the treatment, and they have bulkiness and excellent tangle strength of 0.8 g/d or more, and ■ There is virtually no broken fuzz in the single yarn, but the loops have the same appearance as fuzz. This yarn is excellent for use in marbled knitted fabrics as it has both superior bulk and interlacing properties compared to conventional yarns.

The methods for measuring intrinsic viscosity and entanglement strength are described below.

(Intrinsic viscosity) Polyester as O-chlorophenol solution at 25℃
The intrinsic viscosity measured at

(Entanglement strength) In the S-8 curve of the sample, the lowest point that shows an instantaneous drop in tension of 10% or more with respect to the tension at that position is defined as the yield point, and the stress at the yield point (g/d) is expressed as the entanglement strength.

In other words, in Figure 2, the yield point stress (entanglement strength) is 1.75g.
/d, and the Y point in the figure is the yield point.

In the figure, two unevennesses can be seen before point Y, which are 10
% and is not considered a yield point according to the definition of yield point given above.

Naturally, the higher the yield point, the more desirable it is.
Most preferably, the S-8 curves are substantially smooth; in such a case, the yield points coincide at break.

The S-8 curve was measured using an Instron type measuring device at a sample length of 20 cIfL and a tensile rate of 10 crrL/min, and recorded on a suitable recording paper.

At this time, the measurement was repeated 10 times and expressed as an average value.

Furthermore, the denier used to calculate the yield stress is the indicated denier of the yarn immediately before entering the bulking fluid turbulence nozzle, since the yarn after bulking force loe has bulkiness and its value varies depending on the degree of bulkiness.

The present invention will be described in detail below with reference to Examples.

Example 1 A yarn F that is undyable to ionic dyes has an intrinsic viscosity of 0.6.
Polyethylene terephthalate drawn yarn (75 denier, 36 filaments) of No. 4 was copolymerized with 3 mol% of 5-sodium sulfoisophthalic acid as yarn F2 dyeable with ionic dyes, resulting in modified intrinsic viscosity shown in Table 1. Polyethylene terephthalate drawn yarn (75 denier, 36 filament)
These were combined and bulk-processed using the apparatus shown in Fig. 1.

In this case, the circumferential speed of rollers 4 and 7 is 200 m each.
/min, 160 m /WIJn, and after applying 57711/ynin of water to the yarn from the moisture applicator 5, the supply pressure air is applied by the fluid turbulence nozzle 6 shown in FIG. 4 of US Pat. No. 3,545,057. Air pressure of 5
Kp /cr7r, G, air flow rate 7Nm'/hr
The film was subjected to fluid turbulence treatment and wound up using a winder with a winding tension of 20 g.

The obtained bulky yarn was substantially free of fuzz, and the loop entanglement strength was as shown in Table 1.

As is clear from Table 1, the experiment/% that is the method of the present invention
In Nos. 2, 3, and 4, the entanglement strength was significantly better than in the comparative example of Experiment/161, in which the difference in intrinsic viscosity between yarn F1 and yarn F2 did not satisfy the lower limit of 0.04 specified in the present invention. .

When the obtained products from Experiments/16.2.3 and 4 were knitted into tube knits and dyed with basic dyes, extremely good bulkiness and uniform marbled tone were obtained in all cases.

Example 2 A yarn F1 of drawn polyethylene terephthalate yarn having an intrinsic viscosity of 0.64 and a yarn F2 of a drawn polyethylene terephthalate yarn having an intrinsic viscosity of 0.58 copolymerized with 3 mol% of 5-sodium sulfoisophthalic acid. By using the combinations of denier and number of filaments shown in Table 2, bulky strength loe was obtained in the same manner as in Example 1.

The obtained bulky yarn was substantially free of fuzz.

Furthermore, when the processed bulky yarn was knitted into a tube knit and dyed with a basic dye, the results shown in Table 2 were obtained.

In Table 2, Experiments/165 and 11 are comparative examples for clarifying the effects of the present invention, in which the weight ratio of yarn F1 and yarn F2 is 1:4 to 421 specified in the present invention. is not satisfied.

[Brief explanation of the drawing]

FIG. 1 is a process schematic diagram showing a preferred embodiment for obtaining the polyester bulky yarn of the present invention, and FIG. 2 is an S-8 curve diagram for explaining the entanglement strength of the loops.

Claims (1)

[Scope of Claims] 1. A polyester multifilament F that is undyable with ionic dyes, and a polyester multifilament F2 that is dyeable with ionic dyes and has an intrinsic viscosity that is at least 0.04 lower than that of the multifilament F1. A polyester bulky yarn having a weight ratio of 4 to 421 and having minute loops formed by fluid turbulence, the yarn having an entanglement strength of 0.8 g/d or more. 2 consisting of a polyester multifilament F1 and a polyester multifilament F2 having an intrinsic viscosity at least 0.06 smaller than the multifilament F1,
Claim 1 in which the entanglement strength is 1.0 g/d or more
The polyester bulky yarn described in Section 1. 3 The weight ratio of polyester multifilament F and polyester multifilament 1-F2 is 1; 3 to 3:
1. The polyester bulky yarn according to claim 1 or 2. 4. The polyester bulky yarn according to claim 1 or 2, wherein the filaments constituting the bulky yarn have a fineness of 3.2 denier or less and a total number of filaments of 20 or more.