JPH0364539A - Production of super-soft and specific blended yarn cancelled in shiner - Google Patents

Abstract

PURPOSE:To obtain the title specific blended yarn having excellent dyeing properties and soft and unique handle and suitable for underwear, etc., by properly arranging two kinds of specific undrawn multifilament yarns having mutually different molecular orientation degree and subjecting the yarns to drawing, false-twisting and heat treatment. CONSTITUTION:A highly oriented filament group (preferably consisting of polyester) 2 having 1.5-3.4(d) monofilament denier and >=0.07 birefringence and a low oriented filament group (preferably consisting of polyester) 1 having <=0.8(d) single fiber denier, 0.03-0.06 birefringence and having a ratio of fineness of highly oriented filament group: low oriented filament group (5:5)-(3:7) are doubled and interlaced with an interlacing nozzle 4 and subjected to drawing and false twisting between feed roller 5 and delivery roller 7 at <=78 deg.C, preferably <=60 deg.C, then heat-treated with a heater 8 and wound up with a winder 10 to provide the objective blended yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION (Aspects of the Invention) The present invention relates to a method for producing a special blended fiber yarn that exhibits a novel ultra-soft feel, has excellent dyeability, and is free from irritation.

(Prior art) Synthetic fiber yarns generally have a glass transition temperature (also called a secondary transition temperature), and below this temperature the molecules are frozen and difficult to move. It is common knowledge that by setting the point above the glass transition point temperature, the molecules are made to move more easily and are not attracted to each other. However, if the molecules below the glass transition temperature are frozen and are not forcibly pulled together, the molecules will not be oriented, resulting in a yarn with a unique texture that is sharply different from conventional drawn yarns. However, since the molecules are not forcibly pulled together in a frozen state, they will inevitably stretch unevenly, making it impossible to obtain a uniform outer layer). That is, stretching at a low temperature below the glass transition temperature is disclosed in Japanese Patent Application Laid-Open No. 58-4476.
As shown in Publication No. 2, the so-called Th1ck & T
It is impossible to obtain only the special texture of the hem that causes unevenness because it is the manufacturing method of h1n yarn itself.

In addition, since the molecules in the frozen state are forcibly stretched, the force required is extremely large, which causes many problems such as slipping with the yarn or rollers, fuzzing, and lapping, which reduces the productivity of drawn filament yarns. There is also the problem that the amount of energy decreases.

In addition, as a method for producing bulky S fabricated yarn, a method of plucking and false twisting a plurality of fiber yarns is known, and usually 160
False twisting is generally performed at a false twisting temperature of ~240°C.

Using this method, different textures can be created depending on the yarns to be combined and the false twisting conditions, but most of the yarns are wool-like texture yarns with high crimped bulk. However, it is like a drawn yarn (flat yarn).
Kinukun's processed thread is difficult to obtain.

(Objective of the Invention) The object of the present invention is to produce a soft flat multifilament yarn with excellent dyeability, extremely soft and unique texture, in a state where its polymer molecules are frozen.
without changing the cross-sectional shape of the multifilament.
It also provides a method for producing it without imparting crimp thereto, thereby providing an ultra-soft multifilament yarn consisting of uniformly drawn multifilaments and having uniform appearance and performance, and a yarn obtained therefrom. The purpose of this invention is to provide an ultra-soft and flat multifilament yarn fabric that can be used as an ultra-soft and flat multifilament yarn fabric.

(Structure of the Invention) That is, the present invention provides the following O) to
Using an undrawn yarn consisting of a filament group that satisfies (v) at the same time, draw and simultaneously false-twist the false-twisting temperature at room temperature or at most 78°C. This is a method for producing irritating-free, super-soft 1 to special mixed yarns, which is characterized by heat treatment at a temperature of 20°C or lower.

The present invention is particularly characterized in that the birefringence of the highly oriented filament group is 0.07 or more, and the birefringence of the low oriented filament group is 0.03 to 0.06, and the latter filament denier is It has been found that when the value is 0.86e or less, a yarn with good fullness and extremely soft touch can be produced without worrying about "irritability".

Until now, as a group of low-oriented filaments, the birefringence was 0.
002 or less, especially 0.008 to O, O'09-filament denier, 3.75 to 7.5 de, and on the other hand, as a group of highly oriented filaments, the birefringence is 0.03 or more, especially 0.04.
3~0.048.7 Illament denier is 2.17~
7.7de thread usage is known <woa9/(i
4388 Publication).

However, in the case of using such yarn, that is, the denier of the paper arrangement f+1 filament is thick, and the birefringence between the filament groups is relatively low, the problem of irritation can be solved as in the present invention, and the bulge can be reduced. It cannot be granted either.

The present invention will be explained in detail using specific examples.

FIG. 1(a) is a schematic diagram of a so-called undrawn synthetic fiber yarn. If this is heated above its glass transition temperature and pulled with the constituent molecules thawed, it will be stretched uniformly as shown in (wa).6 However, if this is pulled below its glass transition temperature, Since the constituent molecules are forcibly stretched in a frozen state, the molecules do not line up smoothly, resulting in unsightly and uneven threads as shown in (C).

On the other hand, FIG. 2 shows an aspect of drawing according to the method of the present invention, and as shown in FIG. ) and twisting them as shown in figure (0), the undrawn yarn (i) is easy to bond with, while the splint yarn (2) is difficult to bond with, so in the end, the undrawn yarn (i) (f)1 around splint (2)
As a result, the unstretched system (i) is rolled up uniformly over the length required for winding (~1 (-)).

In other words, when the thread is stretched by pulling it at both ends as shown in Figure 1, it is difficult to stretch the thread from G to C, especially when the molecules are frozen below the crow transition point (secondary transition point). When the threads are pulled and tied together, the threads will be uneven in thickness, with some parts being easy to get along, and some parts being difficult to get along, not so much. - In the process of twisting the thread and making it into a vine, each part of the thread is tied together little by little, so there is no selective elongation that occurs when both ends of the thread are pulled. In each part of the thread, ``uno-11'' will be equally distributed.6 Therefore, even if the temperature is below the crow transition temperature, it can be uniformly distributed, and even if the temperature is below the crow transition temperature, it can be uniformly distributed. Even at magnification, it is possible to achieve uniform and consistent results.

However, with this method, it is not possible to stretch the thread more than 1 so that it will naturally stretch when twisted and wrapped, so the conditions for the magnification at which it can be stretched by itself are determined, but what should be noted here is: When the undrawn yarn (i) is wound while slightly stretching the splint (2), the undrawn yarn (i) is rolled up.
), the elongation of the splint thread (i) is added to the winding process, but the fact that even in that case the splint thread (i) is extremely uniform is the fact that the undrawn thread (i) i)
gb is wrapped around the splint (2) and bound while being restrained.6 Therefore, by adding the elongation of this splint (i), this elongation can be achieved to the extent that The rate can be adjusted. Moreover, in addition to this, undrawn yarn (i
) and the splint (2) are intertwined in advance and then the above-mentioned twisting operation is applied, the constraint relationship between placing and pulling becomes even tighter, and the number of leaders increases.

Figure 3 shows the features of the present invention! l This is an example of an integrated implementation process, in which (i) is an undrawn polyester yarn as a raw material, (2) is an intermediate oriented polyester yarn as a plated yarn, and both yarns are fed by a pair of supply rollers ( 3), and after being intertwined with each other by the air nozzle (4), the intermediate roller (5)
) and are twisted together using a false twister (6).

By the way, the special false twisted yarn of the present invention has the following (as a raw yarn):
60) Highly oriented filament group that can be obtained by the false twisting method shown in FIG. Single fiber denier: 1.5
~3.4de (preferably, 1.8~3.Ode
)(ii) Birefringence of highly oriented filament group (△
n): 0.07 to 0.10 (preferably 0.08 to 0
．． 09) (to) Single fiber denier of low orientation filament group: 0.8 de JJ or less (preferably 0.4 to 0.
7de) (g) Birefringence index of low orientation 749771~ group (
Δn): 0.03 to 0.06 (preferably 0.04
~Q, Q5) (V) The fineness ratio between the highly oriented filament group and the low oriented filaments 1 to 1 is 5:5 to 3:7. In Figure (3), the highly oriented filament group (2) and
The low orientation filament group (i) refers to the filament group (i) which is interlaced with the interlacing nozzle (4) and then transferred to the feed roller (5) and delivery 1 cola (7).
While being stretched to a ratio of 1.1 to 1.4, the fabric is false-twisted and wound up in a winder [10].

Here, when pressurizing false twisting, go to Cera 1? Quality, :':
It is necessary to perform false twisting at a temperature of '+' or at most 78°C.

In the present invention, the core that functions as the splint (2) is
It mainly moves as a body with a tension of 10, and a group of highly oriented filaments forming a top of this core mainly has a single fiber denier (i, 5 to 3) under the conditions (i) and (li) above.
．． 4de) and birefringence (0.07 or more),
It is possible to impart sufficient tension (=J) to the obtained fabric and at the same time impart good wrinkle recovery properties.On the other hand, undrawn yarn (
Corresponding to i), the low-oriented filament group mainly composed of the sheath part is
de or less), birefringence 0.03 to 0.06 ], 0 When the core is mainly composed of highly oriented filaments, the core portion is mainly covered with low oriented filaments that run obliquely to each other with respect to the yarn axis. Since the parts are scattered, it is possible to give the fabric an extremely soft touch and good fullness.

Further, in the present invention, the fineness ratio between the highly oriented filament group and the low oriented filament group is set to 5:5 to 3:7. That is, the unique texture of the processed yarn according to the present invention is expressed by the thin and low orientation filaments of the sheath yarn, which are elongated in a frozen state by polymer molecules, so that the fineness ratio is more than half. It is preferable that there be.

In the present invention, molecules in a frozen state are forcibly stretched to produce a unique ultra-soft texture, but the more the molecules before stretching are not aligned in the fiber axis direction, that is, the lower the degree of orientation, the harder the stretching becomes. As it becomes more difficult, the uniqueness of the texture increases. on the other hand,
Even after dyeing, "without causing irritation,"
Furthermore, from the viewpoint of shrinkage in the subsequent fabric and stability over time, it is therefore desirable that the degree of orientation of the undrawn yarn is 0.03 or more and 1 in terms of birefringence.

Yarn that has been forcibly drawn in this way generally has a large internal strain and a high shrinkage rate when exposed to boiling water, so it is necessary to heat-treat the thread to reduce the shrinkage rate before use. The heater shown in Figure 3 (8) is for this purpose, and its heating temperature must be at least 130°C, preferably 160°C or higher, and heated for at least 0.1 seconds. is good. If this heating is performed continuously following the above-mentioned drawing process, the resulting yarn can be used in any field, so it is safe.
It is also possible to carry out the process after making a 1m piece of fabric.

As a result, in front of the false twister (6), the undrawn yarn (i) is stretched by wrapping around the splint yarn (2), passes through the false twister (6), and is untwisted again. The paper passes through the delivery roller (7), is heated by the heater (3), and is then wound up by the winder (QO) via the take-off roller (9). When the resulting processed yarn is woven and dyed, it is drawn with its molecules frozen, resulting in an extremely soft, marshmallow-like special texture that is completely different from conventional polyvarnish 2-chill products. It is possible to obtain a versatile woven fabric which has a uniform texture and has no thickness unevenness or dyeing unevenness.

In the present invention, in order to obtain such a texture, the temperature at which the constituent molecules are in a frozen state when the undrawn yarn (i) is stretched is lower than the glass transition point temperature (secondary transition point temperature). It is necessary to For this purpose, the temperature used for normal false twisting is 160℃.
It is of course useless to heat at the so-called thermoplasticization temperature of synthetic fibers, which is ~240°C, and it is necessary to keep the temperature at most 78°C or lower, preferably 60°C or lower (heat treatment time of 0.6 seconds or less). Generally, the best results are obtained when the process is carried out at room temperature without applying heat, as in the example above. In particular, for materials with a low glass transition temperature, forced cooling is also good. 6 Also, it is not always essential to intertwine the undrawn yarn (i) and the splint yarn (2) to be supplied in advance in this way;
By intertwining, the undrawn yarn (i) is drawn more evenly as described above, and it also has the effect of preventing the yarn from falling apart after being twisted and untwisted. Regarding the latter, interlacing with false twisting and unraveling may be used depending on the case, but for boat fishing, interlacing before false twisting is preferable, as there is less variation.

In addition, if the amount of stretching of the undrawn yarn (i) is small, it is better to stretch the splint yarn (2) and add it to this as described above. The speed relationship between (7) is preferably carried out in a stretched state, so-called stretched false twisting state. Even in this case, the undrawn yarn (i) does not become uneven as described above, but can be stretched uniformly. In particular, when false twisting is applied using a friction false twister, the yarn slips, so stretch false twisting is essential.

On the other hand, if the yarn is spindle false-twisted, it is not necessarily necessary to use stretch false-twisting, but frictional false-twisting generally allows the yarn to run more smoothly without getting caught.

In addition, because when twisted during false twisting, only the undrawn yarn (i) becomes twisted, it is difficult for the splint yarn (2) to bind together than the undrawn yarn (i). Therefore, highly oriented yarns with a birefringence of 0.07 or more are preferred. As for the drawability, it is desirable that the natural draw ratio (expressed as elongation %) is 40% or more lower than that of the undrawn yarn (i).

4 In the present invention, regarding the composite ratio of the undrawn yarn (i) and the splint yarn (2), originally the unique texture according to the present invention is 1flJ [undrawn yarn (i)
], that is, low orientation 11F+ (-large natural stretch ratio)
Since this occurs, it is better to account for more than half of the amount for boat fishing. However, in the case of fibers that have a molecular orientation that is particularly difficult to stretch, priority may be given to stretchability even at the expense of feel to some extent, but even in that case, the fiber should account for at least 30%.

On the other hand, if the low orientation side increases too much, the high orientation +1! IJ [
The splint (2) becomes thinner, making it difficult to form a spiral shape and causing thread breakage, so it is desirable to keep the splint to at most 80% or less.

Regarding the number of false twists, in the case of the present invention, the number of false twists is
It is not necessary to apply shrinkage because it is not the purpose, but conventional false twisting produces the effect regardless of the number of twists. For example, in the case of false twisting, an effective crimp cannot be achieved with a loose twist number of about 14000/(iτt/m), but in the present invention, cold stretching of the yarn occurs in accordance with the twist number, and a certain effect is obtained. However, unless the material is particularly difficult to twist, it is better to make the yarn as high as possible for stable processing at a false twist number of less than 32,000/F■T, which makes the yarn more likely to break. It is effective because it is well balanced.When false twisting is performed by frictional false twisting, it is difficult to measure the number of false twists, but it is good to keep D/Y at a value of 1.3 to 2.8.

put it here De-Total yarn Da during false twisting D/Y-False twisting disk surface speed/Yarn speed during false twisting It is.

(Operations and Effects of the Invention) At first glance, the process of the present invention is similar to the process for producing layered textured yarns with a predetermined false twist and winding as found in Japanese Patent Publications No. 61-19733 and Japanese Patent Publication No. 56-25529. , their effects and the structure of the resulting threads are completely different.

That is, in the case of a double-layer M construction system with false twisting and winding, the yarn is twisted into a wound state by false twisting and heated to a high temperature, and in that twisted form f
Since the m female molecules are reoriented and crystallized, the shape is ripened for 1 hour.
I is determined. Therefore, even if this is untwisted, the twisting and twisting remains, resulting in a two-layer processed yarn with a "twisted" structure as shown in Figure 4 (g), which has a spun-like texture. Contrary to this, in the method of the present invention, even if the yarn is twisted into a twisted state by false twisting, it is not heated and set, so the winding curls and twisting curls remain completely, and the yarn becomes (h). It will be a straight thread like this, and will not have a spun-like m construction. That is,
Its structure is straight like a filament,
By forcibly pulling the frozen molecules together, the filament yarn has an extremely soft touch that is completely different from conventional fibers, and is fluffy and free from irritation during dyeing.

In addition, when forcibly stretched at room temperature below the glass transition temperature, the molecules are in a frozen state, so the stretching tension becomes extremely large, especially at a spinning speed of 2000 m/l1.
In the case of undrawn yarns of less than lin, in which the molecules are hardly oriented, the force is extremely large. Therefore, normally drawing wraps, yarn breakage, fuzzing, and slipping occur, making productivity difficult. In addition, the stretching force is mainly caused by twisting force, so not only equipment such as a drawing machine that can turn the roller many times, but also a simple one-nip roller device such as a false twisting machine can cause production problems. Another advantage is that it can be easily stretched.

In addition, the yarn of the present invention has extremely soft texture characteristics that break the concept of conventional synthetic fibers. Therefore, such yarns can be particularly suitably used for high-density fabrics used for sports oak, clothing, or thin fabrics such as blouses.

In addition, when applied to polynisder fibers, which have a relatively high modulus and therefore have a hard and stiff texture, the strange characteristics of polyester up until now are lost, and the texture is very soft, almost marshmallow-like or cherry-like. Since the filament is soft to the touch like paper, its use can be expanded to inner clothing such as clothing that comes into direct contact with the skin, baby clothing, etc., and its advantages are great.68 It can also be used in the present invention. Any synthetic fiber that can be drawn can be used as the material, but especially when applied to polyester fiber, its inherently hard texture can be greatly improved by making it softer, or the low-temperature freezing of the present invention has a high glass transition temperature. The effect of application is fundamental in that the effect of stretching can be further exhibited.

EXAMPLES The present invention will be further illustrated by the following examples. Among the six examples, the following measurements were carried out.

Make a total of about 3000 denier and load it with 0.1 g
/de was applied to read the original length Fo (cIn). The total load was changed to 2/de, and this was heated in boiling water for 30
After heat treatment for minutes and drying at room temperature, the load was 0.1g/
Instead of de, the length fl (cm) was read. Next, change the load to 2/de and leave it in heated air at 180°C for 1 minute! 11j, the load was changed to 0.1 g/da, and the length 129 (cIn) was measured.

0 1 Diving shrinkage rate BIIIS (%) ×100 Evening 0 180'C dry heat shrinkage after spring water 11S (%) 1o 1
1 × 100 0 Self-elongation rate - BI4S (%) - 1is (χ) The flexibility of the fabric was evaluated by bending hardness (BSN), and the resilience of the fabric was evaluated by bending repulsion (BR).Measurement The law is JIS
The 6.20.3C method (bending loop compression method) of L 1096 was used.

The anti-pilling property was measured and evaluated using an IC1 type tester shown in 1 of JIS 1.1076 and method A (method using an ICIC extruder) shown in test method 6.1 of the same.

Abrasion strength arsenic, JIS l 1096 A-3 method (fold L
According to the method shown in Method 1), polyethylene terephthalate having an intrinsic viscosity [η] of 0.64 measured using #(ioo) as 117F paper was spun at a spinning speed of 3000 m/min. Obtained polyester low oriented undrawn yarn 82de/144fi
la [birefringence: 0.045, natural stretch ratio 245
% (1.45 times magnification) Elongation: 135%, Glass transition point: 80'C1 Fineness: 82de, Number of filaments:
144 cross-sectional shape: circular] (i) and spinning speed 4500
Highly oriented yarn obtained by spinning at m/min 50 de/
24f i 1af21 [birefringence 20.086,
Natural stretch ratio = 30% (1.30 times magnification) Elongation: 7
5%, glass transition point: 85°C, fineness: 50de, number of filaments: 24] with a blending ratio of 62:38, and under the conditions of overfeed: 1.0%, air pressure: 4kg/c+fl and subjected to an air entangling nozzle,
The filaments were entangled with -t:(H). Then, 63
In a triaxial friction false twisting device rotating at a surface speed of m/l1lln, at a speed of +350 m/min, elongation rate = 55%, stretched and false-twisted 32 g of false-twisted crabs and 37 g of untwisted crabs were placed at room temperature (2
After heating the intertwined multifilament yarn at 5℃), the entangled multifilament yarn was untwisted for 1 hour, and then heated at 230℃ with an overfeed rate of 0% (heat treatment time 0). .2 seconds) to reduce the heat shrinkage rate of each filament, and the resulting processed yarn was wound around a wine goo to obtain a yarn of 110 denier/168 filaments.

When this yarn was observed under a microscope, no deformation was observed in the cross-sectional shape of each filament6.Furthermore, the yarn itself was non-torque, with virtually no crimp observed in the filaments; Fiber flat multifilamen 1
- It had the same appearance as yarn.

In the above processing, only stretching was performed without using the false twisting device, and the required stretching tension was 120 g/d.

The properties of the obtained flat mulched filament 1 yarn were as shown in Tables 1 and 2. 6 Next, the obtained yarn was twisted at 800'l'/m and then twisted in a twill structure. After weaving it, reducing its weight by 10%, and dyeing it, it becomes a polynisdel fabric with a completely new feel that is completely different from the touch of conventional polynisdel fabrics: it is smooth, extremely flexible, light and does not wrinkle2, making it ideal for inner wear. and conventional polynisdeljmjlt
It has now become possible to advance commercially into the ultra-soft field, which is a weak point for textile products.6 The dyeing conditions are not shown in Table 3, and the fabric properties are not shown in Table 4.

Table 1 3 Table 3 Weaving, dyeing conditions 5 Table Using this processed yarn, a dyed fabric was prepared under the following weaving conditions (texture: twill), alkali treatment and dyeing conditions.

4 Table 1liiIi! P! The hardness of lI characteristic 1111 was around 1.5 g before alkali weight loss and around 1.2 g after alkali weight loss.

Examples 2 to 4, Comparative Examples 1 to 6 Table 5 shows the yarn properties and fabric properties when the raw yarn conditions and false twisting conditions were changed to seed in Example 1 (data from Example 1 are also listed). )66

[Brief explanation of drawings]

Figure 1 is a schematic diagram explaining the conventional stretching principle, Figure 2 is a schematic diagram explaining the stretching principle of the present invention, Figure 3151 is a process diagram showing an embodiment of the present invention, and Figure 4 is a schematic diagram explaining the stretching principle of the present invention. FIG. 2 is a schematic diagram showing the difference between this yarn and a conventional spunlike yarn. Figure 3 shows 6 (i)...Undrawn yarn (2)...Plint yarn (3) with a higher degree of orientation than the undrawn yarn (i)...Supply roller (4)...Air Intertwining nozzle (5)...Intermediate roller (6)...False twisting tool (7)...Delivery roller (8)...Heat treatment heater (9)...Pull I! Roller 8 Figure 3 (Italy) (7I)

Claims (1)

[Claims] When undrawn filament yarns with different degrees of molecular orientation are drawn together and subjected to stretching and false twisting, an undrawn yarn consisting of a filament group that satisfies the following (i) to (v) at the same time is used: ( i) Single fiber denier of highly oriented filament group: 1.5
~3.4 de (ii) Birefringence of highly oriented filament group: 0.07 or more (iii) Single fiber denier of low oriented filament group: 0
．． 8de or less (iv) Birefringence of low oriented filament group: 0.03~
0.06 (v) The fineness ratio of the highly oriented filament group and the low oriented filament group is 5:5 to 3:7. Obtained by carrying out simultaneous stretching and false twisting at room temperature or at most 78°C. A method for producing an ultra-soft special mixed fiber yarn free from irritation, characterized in that the yarn is heat-treated at a temperature of 130° C. or higher in a subsequent process.