JPH01292124A - Production of composite processed polyester yarn - Google Patents

Abstract

PURPOSE:To obtain the subject linen-like processed yarn having dry and refreshing feeling, by doubling a false-twisted yarn composed of an undrawn polyester yarn having low elongation at break with an undrawn yarn having high elongation at break and heat-treating the doubled yarn. CONSTITUTION:(A) A false-twisted yarn is produced by the simultaneous drawing and false-twisting process of a highly oriented undrawn polyester yarn having an elongation at break of 50-100% at a draw ratio of 1.15-1.40. Separately, (B) a yarn having an elongation at break higher than that of the above false-twisted yarn by >=80% is produced by using an undrawn polyester yarn which is a slub yarn composed of flat and eccentric hollow filaments having unevenness in longitudinal direction and having an elongation of >=130% in undrawn state or after cold-drawing at a draw ratio of 1.15-1.40. The false- twisted yarn and the undrawn or cold-drawn yarn are doubled, interlocked and heat-treated to obtain the objective composite yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing polyester composite textured yarn,
More specifically, the present invention relates to a method for manufacturing linen-like polyester composite yarn that is rich in silkiness and coolness.

(Prior art) In general, synthetic woven and knitted fabric products (1+L) have a shell-like appearance and feel and give a cool feel. The development of spunlike yarns aimed at this purpose has been active, and numerous proposals have been made.

For example, two or more types of yarns with different elongations are fed in a lined state [supplied to a J-ra and used by a false twisting spindle.

When twisted, yarns with low elongation are twisted so that they are difficult to stretch and form the core of the yarn, while yarns with high elongation are twisted so as to surround the outer layer of the yarn in order to stretch and cover. Ru. It is known that when this twisted yarn state is thermally identified and untwisted, a spunlike composite textured yarn is formed in which the threads with low elongation form the core and the threads with high elongation surround the core. It is being

As methods for producing such spunlike composite textured yarns, there is a method of plucking undrawn yarns with different birefringence indexes and stretching and false twisting (Japanese Patent Publication No. 6-17453), a drawing system and a highly oriented A method of drawing and interlacing undrawn polyester yarns and then false-twisting them at the same time (Japanese Unexamined Patent Publication No. 55-93
No. 822), a plurality of undrawn polyester yarns having different birefringence, elongation at break, and hard viscosity are interlaced and intertwined, and then subjected to simultaneous stretching and napping. A method (Japanese Unexamined Patent Publication No. 174436/1983) has been proposed.

(Problems to be Solved by the Invention) However, although the composite processed yarn produced by the conventional method is spun-like and suitable for autumn/winter clothing of 19 fabrics, it lacks crispness and coolness. There was a problem in that it was not suitable for thin spring/summer clothing.

In addition, strong twisting is used to give a crisp and cool feel, but this requires a twisting process.
There is a problem that loss 1 leads to increase.

The purpose of the present invention is to solve the problems of the conventional method and to provide a sufficient crispness without the need for heavy processing.

The object of the present invention is to provide a method for producing a polyester two-layer structure yarn that has a refreshing feel and is suitable for use as a 1'l yarn for thin spring/summer clothing.

(Means for Solving the Problems) As a result of intensive studies to achieve the above object, the present inventors found that among two types of undrawn polyester yarns having different elongations at break, the one with the smaller elongation at break. One of the undrawn yarns is a drawn false-twisted yarn, and the other undrawn yarn with a higher break elongation (from a filament having a special cross-section III structure as shown in JP-A No. 61-239009) The present invention was achieved by discovering that it is sufficient to use thick and thin undrawn yarns or cold-drawn yarns, intertwine them, and heat them.

That is, in the present invention, the following yarn A is stretched at a draw ratio of 1.15 to 1.
False-twisted yarn that has been simultaneously stretched and false-twisted at 40 times and yarn B shown below that is not stretched or has a stretching ratio of 1.15 to 1.40.
A method for producing a polyester composite textured yarn, comprising interlacing and heat-treating a yarn that has been cold-stretched at a double speed and has a breaking elongation that is 80% or more higher than that of the false-twisted yarn.

The undrawn polyester yarn used in the present invention is mainly made of polyethylene terephthalate, but it may also be one copolymerized with a third component in a proportion of 15 mol% or less. Further, the yarn may contain additives such as a 6-color agent and a fl fuel.

It is necessary that the two types of polyester yarns used in the present invention have a difference in elongation at break of 80% or more. When the difference in cutting elongation is less than 80%, a satisfactory crispness is obtained.

I can't feel the coolness.

In addition, among the above two types of undrawn polyester yarns, the highly oriented undrawn yarn A has a birefringence of 0.08 to 0.12.
It is preferable that the cutting elongation be 50 to 100%. In addition, the undrawn yarn B on the low orientation side is a thick and thin yarn composed of flattened and eccentric hollow filaments that are thick and thin in the longitudinal direction, and the constituent filaments 1 to 1 are the outer periphery in the longitudinal direction in the cross section. The part has a pair of recesses facing each other with the long sleeve in between, and has an asymmetrical shape with respect to a short axis existing between the pair of recesses, and the short axis connects the hollow part side and It is a filament that is divided into a solid part side, in which the cross-sectional area and degree of orientation of the former are both larger than the latter, and its cutting elongation is 130% or more as a thick and thin filament. , undrawn polyester yarn.

Furthermore, to explain this undrawn yarn B in detail with reference to the drawings, in FIG. 1, n is the long sleeve, C is the short axis, x, x
' is a pair of recesses facing each other with the long sleeve (n) in between, e
is the hollow part 1m is the cross section of the filament, and the length 1g of the straight line showing the maximum value among the straight lines parallel to the short axis (C) is the hollow part (e
), h is a hollow part divided by the short axis (C), and h is a solid part also divided by the short axis (C), and the cross-sectional area of the Q part is always larger than that of the h part. It's large.

The cross-sectional shape of the filament constituting the undrawn yarn B used in the present invention is flat as shown in FIGS. 1(a) and 1(b), and has a pair of recesses (x ,
x'), and is asymmetrical with respect to the short axis (C) formed by connecting the short axis (C), and the cross-sectional area of the hollow part side (()) divided by the short axis (C) is the adjacent solid part side ( h).

Then, the orientation degree of the 9 portions of the filament cross section having the above-mentioned cross-sectional shape is higher than the orientation degree of the h portion, and the filament 1
As shown in Figures 1(c) and 1(d), the cross-sectional area of portion h changes more widely than the cross-sectional area of portion g in the longitudinal direction. .

Moreover, in the cross-section of the filament 1, the cross-sectional area including the hollow part is larger than the part h, as shown in FIG.
The unstretched fibers used in the present invention have a high degree of orientation, and as will be described later, the unstretched fibers used in the present invention have an extremely high degree of orientation. The filaments constituting yarn B also have a large degree of shrinkage in the cross-sectional direction.

FIG. 4 is a cross-sectional view of the discharge holes of the spinneret employed in the method for manufacturing undrawn yarn B, in which 18 to 1c, 2.3 are discharge holes for discharging large-scale coalescence flow, and 4 is a discharge hole for discharging large-scale coalescing flow. 18 to 1c are the hollow portions formed by Pi number of sleeves (2 is a single discharge hole, and 3 is the number of sleeves 1 to 1C of 1a to 1C and the hollow portions (4).
) is the slit that connects the single discharge hole (2) with the single discharge hole (2), lΔ2 is the inner diameter of the single discharge hole, ! and W indicate the width and length of the slit (3), and IA+ and 1131 indicate the outer diameter and inner diameter of the hollow discharge hole in FIG. 4(a), respectively.

The characteristics of such discharge holes are that, as a pair of discharge holes with different discharge cross-sectional areas, a hollow discharge hole consisting of a plurality of slits (LA to IC) is arranged in one discharge hole with a different discharge cross-sectional area; This is because the upper discharge hole (2) is adopted as each small discharge hole, and the hollow discharge hole and the single discharge hole (2) are connected by a slit (3).

Birefringence is 0.08-0.12, cutting elongation is 50-1
00% undrawn yarn A is polyester spun at a spinning speed of 45
Obtained by spinning at 00 to 5500 m/min,
The cutting elongation of one eccentric hollow filament is 130%.
The above undrawn polyester yarn B has a spinning speed of 2800
It is obtained by spinning at a speed of m/min or less.

Next, the two types of undrawn polyester yarns mentioned above were stretched at the same stretching ratio within the range of 1.15 to 1.40 times,
Undrawn yarn A is stretched and false-twisted at the same time, and undrawn yarn B is cold-stretched, then both are intertwined and heated, or the latter is omitted from the cold-stretching step and supplied as is. Doubling I8 t! L/me, heat set.

No. 5 is a route map that does not show one embodiment of the present invention. The smaller undrawn polyester yarn (breaking elongation of 130% or more) 1° is drawn simultaneously between the feed roller 2 and the first delivery roller 3 at the same drawing ratio. In this case, the polyester undrawn yarn 1 having the smaller elongation at break is connected to the first heater 4. It passes through the false twisting shell 5 and is subjected to simultaneous stretching and false twisting. - direction, the undrawn polyester yarn of 1° with a different elongation at break was heated to the first heater 4. It does not pass through the false twister 5, but is directly guided to the first delivery roller 3 and cold-stretched.

As the false twisting tool 5, any false twisting device such as a spindle type, a belt type, a circumscribed friction type, etc. can be used. The stretching ratio is 1°15~1
．． Selected within the range of 40 times. If the draw ratio is too high, it is inappropriate because fluff and yarn breakage will occur frequently in the undrawn polyester yarn 1, which has a smaller elongation at break.On the other hand, if the draw ratio is too low, the elongation at break will increase. A large amount of unstretched portions remain in the undrawn polyester yarn 1, which has a large force, and the remaining unstretched portions are hardened by heat-letting performed later.

This is not preferable because it becomes brittle, the texture becomes dull, and the strength decreases.

In addition, instead of the above-mentioned undrawn yarn 1°, undrawn yarn 1°
(The elongation at break is 80% or more higher than the elongation at break of the undrawn yarn 1 after stretching and false twisting) may be used to supply the yarn to the first delivery roller 3.

In this way, both yarns that have been false-twisted and cold-stretched at the same time as the first
The interlace nozzle 7 provided between the delivery roller 3 and the second delivery roller 6 interlaces the yarn, heat sets it with the second heater 8, and winds it up on the winding device 9. The degree of entanglement in the interlace nozzle 7 is preferably about 40 to 60 entanglements/m. The temperature of the second heater 8 is usually 170 to 2
10°C is used, and the second heater temperature, that is, the heat ret temperature, is preferably 185 to 210°C, especially in order to create a partial valley in the processed yarn and further enhance the feeling of heat. .

In the thus obtained polyester composite textured yarn, the undrawn yarn 1 with the smaller elongation at break is subjected to drawing and simultaneous false twisting, and the one with the larger elongation at break is located in the core. The undrawn yarn is cold-stretched at 1° and is located relatively to the sheath part, the former having false twist crimp, and the latter having thick and thin lanes with intermittent unstretched parts. ing. In particular, when the heating temperature is increased, partial fusion occurs in the latter,
The crispness and coolness are further improved.

In addition, since the method of the present invention is intended to provide a composite processed yarn suitable for thin spring/summer clothing that has a crisp and cool feel, the fineness of the composite processed yarn should be 170 denier or less. Preferably, the drawing and simultaneous false twisting yarn fineness: cold drawing yarn fineness is 30:70 to 60:40, the drawing and simultaneous false twisting yarn fineness is 2.0 denier or more, and the cold drawing yarn single yarn fineness is 2. It is desirable that the denier be .5 denier or less.

(Example) Hereinafter, the method of the present invention will be explained in detail with reference to examples.

Examples 1-2. Comparative Examples 1 to 3 Two types of undrawn polyester yarns having different breaking elongations obtained by spinning polyethylene terephthalate having a limiting viscosity of 1 to 0.63 with various spinning dars were combined as shown in Table 1. Using the apparatus shown in the figure, one undrawn yarn 1 is stretched and simultaneously false-twisted at various stretching ratios, and the other undrawn yarn '1'' is
・Cold stretch and doubling.

After the entanglement treatment, heat set at 190'C and
It was wound up at a speed of 40 m/min. In this case, the temperature of the first heater 4 was 170°C.The temperature of the first heater 4 was 170°C. (301X/1
φX2.3D, air pressure 1.5 to 9/cm”G
, the amount of compressed air used is 8 bN1/min) and the overfeed rate is 1.
The drawing process was carried out by supplying a false twisted yarn and a cold drawn yarn at a rate of 5%, and the degree of entanglement was 60 threads/m.

Next, the obtained composite textured yarn was knitted into a tube, and the stiffness was evaluated. The results were as shown in Table 1.

As is clear from the above results, the method of the present invention (Example 1
According to ~3), a composite textured yarn with good crispness and coolness can be obtained, but when the difference in elongation at break is less than 80% (Comparative Example 1), no crispness occurs and the stretching ratio is 1.15-1
．． If the stretching ratio is outside the range of 40 (Comparative Examples 2 and 3), the texture will be poor, if the stretching ratio is too low (Comparative Example 2), the texture will be hard, and if the stretching ratio is too high (Comparative Examples 2 and 3), the texture will be hard. Example 3) has two yarns with multiple fluffs.

Comparative Example 4 In Example 1, an undrawn yarn (birefringence 0.10, breaking elongation 60 %) and spun at a spinning speed of 2,800 m/min, the undrawn yarn was subjected to drawing and simultaneous false twisting, and the resulting composite textured yarn did not exhibit any stiffness or coolness at all. Ta.

Example 4 Example 2 was carried out in the same manner as in Example 2, except that 1° of undrawn yarn was supplied to the first delivery roller 3 instead of 1° of undrawn yarn. As a result, a composite processed yarn with good crispness and coolness was obtained.

Examples 5 to 9 In Example 1, the heat setting temperature after doubling and entangling was variously changed. The results are shown in Table 2, especially for 185
When the temperature is ~210°C (Examples 7 to 9), partial melting occurs and the scorching sensation is further improved.

Table 2

[Brief explanation of the drawing]

Figures 1 (a) and (b) show undrawn yarn B used in the present invention.
Cross-sectional views of the constituent filaments, Figures 2 (a) and (b)
3 is a cross-sectional view of the undrawn yarn, FIG. 4 is a plan view of the discharge hole of the filament, and FIG. 5 shows the culm of the composite processed yarn of the present invention. The route map is not shown. 1.1', 1''°...Polyester undrawn yarn. 5...False twister, 7...Interlace nozzle. 8...Second heater. Fig. 1 Fig. 2

Claims (2)

[Claims] (1) False-twisted yarn in which yarn A below is stretched and simultaneously false-twisted at a draw ratio of 1.15 to 1.40 times, and yarn B shown below is not stretched or is drawn at a draw ratio of 1.15 to 1.40 times. The elongation at break is 80% higher than that of the false twisted yarn.
1. A method for producing a polyester composite processed yarn, characterized in that the yarns are interlaced and heat-treated with a high yarn content of at least %. Yarn A: Highly oriented polyester undrawn yarn having a breaking elongation of 50 to 100%. Yarn B: Thick and thin yarn composed of flattened and eccentric hollow filaments that are thick and thin in the longitudinal direction, and the constituent filaments are arranged opposite to each other across the long axis at the outer periphery in the long axis direction in the cross section. and has a pair of recesses having an asymmetrical shape with respect to a short axis existing between the pair of recesses, and is divided by the short axis into a hollow part side and a solid part side; An undrawn polyester yarn, in which the former has a larger cross-sectional area and degree of orientation than the latter, and the thick and fine yarn as a whole has a breaking elongation of 130% or more. (2) The method for producing a polyester composite textured yarn according to claim 1, wherein the heat setting is carried out at 185 to 210°C.