JPS59204934A - Production of latent bulky polyester yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for producing polyester yarn having latent bulkiness.

[Prior art]

Conventionally, a method has been proposed in which bulky fibers are obtained by subjecting individual filaments to non-uniform heat treatment by entangling thermoplastic multifilament yarns and then running them in contact with each other for a short period of time on a high-temperature heating element. When the temperature of the heating element is raised or the running tension is lowered in order to improve the properties, loops and sag occur in the fibers, making them unsuitable for high-order processing. In order to improve these defects, non-uniform heat treatment is performed under a running tension greater than the dry heat shrinkage stress, or after non-uniform heat treatment, further tension or heat treatment is performed to eliminate loops and sagging that have occurred and increase bulk. Methods have been proposed to make the bulkiness latent, but in addition to the drawback that the bulkiness that is developed by relaxation heat treatment is reduced, there is also the problem that the difference in bulkiness between weights makes it impossible to put it into practical use for woven and knitted fabrics. It had a point.

[Objective of the Invention] The object of the present invention is to apply moist heat/dry heat treatment in a relaxed state during the dyeing process after making a woven/knitted fabric to develop bulk in the structure of the woven/knitted fabric. When bulking yarn, it has excellent bulkiness, and the variation in bulkiness caused by the difference between weights in the non-uniform heat treatment process in the manufacturing process of the yarn is extremely small, resulting in streaks or spots on the surface of woven or knitted fabrics. Our objective is to provide a latent bulky polyester yarn of exceptional quality.

[Structure of the invention]

That is, in the present invention, by subjecting an undrawn polyester yarn to an interlacing treatment in a relaxed state after stretching, knotted portions and spread portions are alternately formed along the longitudinal direction of the yarn, and subsequently, knotted portions and spread portions are formed on a heating pin. In the method of producing latent bulky polyester yarn by running it for a short time and applying non-uniform heat treatment to the individual constituent fibers, the following requirements (a) ~
This is a method for producing a polyester yarn with high latent bulk, which satisfies all of (g).

(B) The hot water shrinkage rate (B, W, S') of the thread after drawing is 1
Must be between 5% and 45%.

(b) The number of repetitions of knotted parts and spread parts formed by interlace processing is 17.1fi50 or more.

(c) Do not allow any object to squeeze the yarn between the interlacing device and the heating pin.

) The radius of curvature (6) of the heating pin is 5 to 30 mm,
The contact angle (θ) with the thread running on the pin is at least 90 degrees.

(E) The surface temperature of the heating pin is 160 to 200°C,
The contact time of the thread running on the pin is 5×10-5 to 15X
The running tension (Fl) of the yarn guided to the heating pin is 0.05 to 0.15 t/denier, and the heating pin is non-uniformly heat treated. After that, the running tension (F2) of the yarn guided to the take-up roller is 0.1
5 to 0.50 f/denier.

(g) B, W of the latent bulky polyester yarn to be formed
, S is 30 inches or less, and the dry heat constant longitudinal thermal stress at 100°C is at least 0.152/denier.

The present invention will be explained in more detail below with reference to the drawings.
The figure is a side view of the yarn after it has been interlaced. 1 is the knot, ! 2. indicates the opening part.

FIG. 2 shows an enlarged side view (a) and cross section (b) of the spread part, and it is clear that there are large gaps between the filaments in the spread part.

Figure 6 shows a method of non-uniform heat treatment using a heated pin in the invention, where θ is the contact angle between the pin and the yarn running on the pin, and Fl is the amount of yarn entanglement imparted by the interlacing device. F2 is the running tension of the yarn that is subsequently led onto the heated pin, F2 is the running tension of the yarn that is subsequently led to the take-off sheet roller after the heat treatment, and 3 is the heated pin.

Figure 4 shows the filament arrangement at the spread part of the yarn running on the heating pin.
The heat treatment atmosphere temperature that each filament actually receives is Ta, Tb, Tc ℃.
It is expressed as (Ta>'rb>Tc).

Figure 5 shows the heat treatment atmosphere temperature and E when highly shrinkage polyester drawn fibers are heat treated under relaxed conditions after drawing.
, W, and S. In this case, from 50°C to 1
This shows that in the range of 50°C, B, W, and S are significantly affected by the heat treatment temperature. Figure 6 shows a model of the state in which the thread running on the heated pin is subjected to non-uniform heat treatment. It represents. The reason why a potentially bulky yarn can be obtained according to the present invention is considered to be as follows. In other words, the yarn shown in FIG. 1, which has been provided with multi-filament entanglement by interlacing, contains air with low thermal conductivity in the gaps between the filaments at its spread portion, but the yarn shown in FIG. When running in contact with a heated pin for a short period of time, the temperature on the pin surface is not uniformly transmitted throughout the system due to the presence of air contained in the gaps between the filaments, and as shown in Figure 4, the temperature on the pin surface is not uniformly transmitted to the entire system. The ambient temperature of the filaments fa, fb, fc gradually decreases to Ta) Tb') Tc as the distance between the filaments fa, fb, and fc differs among the filaments according to the relationship between the relaxation heat treatment ambient temperature and B, W, and S shown in Figure 5. B, W, S i will be shown.

When yarns having different B, W, and S values are subjected to an appropriate relaxation heat treatment, minute loops are formed in the delicate bundle due to the difference in shrinkage between the filaments, resulting in bulkiness.

In the present invention, as shown in FIG. 5, the use of highly shrinkable drawn yarns allows B, W, and
, is necessary in order to greatly change S and apply non-uniform heat treatment to individual filaments, but the non-uniform heat treatment also provides the effect of preventing loops or sag in the fibers. The reason for this is that when a highly shrinkable drawn yarn is used, it is possible to obtain sufficiently high latent bulkiness even when the surface temperature of the heating pin is below 200°C. This is because when the fibers come into contact with a heating element at a temperature of over 200°C, they undergo a shocking heat treatment, causing loops and sag in the fibers. In the present invention, B, W, and S of the high shrinkage drawn yarn must be in the range of 15 to 45%. If it is less than 15q6, the difference in shrinkage between filaments that have been strongly heat-treated and filaments that have not been strongly heat-treated is small, making it impossible to obtain high potential bulkiness.

If it exceeds 45 inches, it is possible to easily obtain high potential bulkiness, but the B, W, and S of the yarn itself also become high, which is preferable because the texture becomes hard when loosened and heat treated after being made into a woven or knitted fabric. do not have. The high shrinkage drawn yarn of the present invention is 20×1
An undrawn polyester yarn having a birefringence of 0-3 to 60 x 10-3 and having at least 85 moles of ethylene terephthalate as a constituent unit is processed by a known method by appropriately selecting the Q-stretching temperature and the stretching ratio. It can be easily obtained by uniformly stretching the fibers in the longitudinal direction without any unevenness.

The yarn interlacing in the present invention is performed using a known interlacing device (
For example, in the device described in JP-A-55-S 7'03 A), a compressed air pressure of 1 to 5 Kf/6n2 and a relaxation rate of 1 are used.
It is sufficient to allow the passage to take place in a relaxed state. It is necessary that the number of repetitions of knotted portions and spread portions formed along the longitudinal direction of the fibers due to yarn entanglement is at least 950 degrees per metric liter. If it is less than 50 inches, the bulge in the opening part shown in Figure 2 (B) is easily crushed into a flat shape, and the large gaps between the filaments disappear, resulting in the state shown in Figure 6 (A). As a result of being subjected to heat treatment, high potential bulkiness cannot be obtained. Furthermore, in the present invention, no guide or roller for squeezing the yarn should be interposed between the heated pins from the interlacing device. That is, it is necessary to guide the threads coming out of the interlacing device as they are over heated pins. If a guide or roller is used, the yarn will be squeezed and the cross section of the spread portion will be flattened.

In the present invention, the arrangement of filaments in the spread portion of the yarn is
It is essential to guide the wire over the heated pin in the state shown in Figure (b).

In the present invention, the pin used for uneven heat treatment of yarn has a radius of curvature a→
is required to be in the range of 5 to 50 nrm. R
If the number of questions is less than 5, the yarn and (1) contact length are absolutely small, and the yarn wobbling on the pin due to the vibration of the yarn that occurs when the yarn is interlaced by the interlacing device will affect the heat treatment effect. In addition, due to the effect of the edge on the person 141, the running of the thread becomes unstable (jumping), and it is only possible to obtain an uneven, high-quality finish of product J1, which has a large amount of intersaltaceous fat. . When R exceeds 60 mm, the contact length with the yarn increases, and lj;
When the blood becomes as shown in FIG. 6(a), the entire filament undergoes uniform heat treatment, and a height of τ1'1 can be obtained; it approaches λ.

The contact angle (θ) with the thread running on the pin is at least 9
It is safe if the angle is 0 degrees or more, and if θ is less than 90 degrees, the slight difference in θ between the spindles will be large and affect the potential bulkiness. In other words, the yarn wobbling on the pin resulting from the vibration of the yarn caused by interlacing the yarns by the interlacing device becomes rapidly stabilized as θ increases, and at 90 degrees or more, the difference between spindles in heat treatment caused by the yarn wobbling on the pin becomes extremely small. .

The surface temperature of the heated pin needs to be in the range of 150 to 200°C. As shown in Figure 5, when Yi is below 150°C, the heat treatment effect is weak, and the
? 15 Processing is not uniform enough. When the temperature exceeds 200°C, the running yarn comes into contact with the heated pin and undergoes a shocking heat treatment at the moment of ζ, causing loops and slack in the fibers. The contact time of the thread running on the pin is 5 x 10
It is necessary that the time is extremely short, in the range of -'~p1sx1o-' seconds. Open for less than 5 x 10-' seconds
Of the filaments of eQ M'B, only the filaments close to the pin surface are heat-treated, and most of the filaments are pulled off to a point of high shrinkage, resulting in insufficient latent bulk. On the contrary, 1
If the time exceeds 5 x 1o-' seconds, most of the filaments will be uniformly heat-treated and the latent bulkiness will also be insufficient.

In the present invention, the running tension of the thread guided by the heated pin (
F,) and the running tension (F2) of the yarn, which is led to the take-off shear roller after being subjected to non-uniform heat treatment with heated pins, are extremely important. Fl must be in the range of 0.05 to 0.15 F/denier, and if Q is less than 0.5 f/denier, the yarn may jump on the heating pin as shown in Figure 6 (c). This occurs, and only a thread having a Th1ck and Th1n appearance with a mixture of loops and slacks is obtained because heat-treated portions and non-heat-treated portions are repeated in the longitudinal direction of the yarn. When F exceeds 0.15 r/denier, as shown in Figure 6 (0), the opening part is pressed onto the force n heat pin and the entire system is uniformly heat treated, making it impossible to obtain high latent bulkiness. ,Can not. The excellent latent bulkiness of the present invention can only be obtained when Fl is in the range of 0.05 to 0.15 F/denier. F2 is 0.15 to 0.30? /Tenium range. o, less than 151 f/denier is undesirable as it causes yarn jumping on the heating pin shown in Figure 6 (/9).
As shown in (a), the opening portion is forced onto the heating pin, making it impossible to obtain high potential bulkiness.

In the present invention, Fl and F2 can be easily obtained with a relaxation rate in the range of 1 to 10 degrees. The latent bulky polyester yarn obtained in the present invention must have B, W, and 8 of 30% or less and a thermal stress of at least 0.151/denier.

If B, 'W, and S exceed 60%, the texture becomes hard when the fabric is made into a woven or knitted fabric and then subjected to relaxation heat treatment to make it bulky, which is not preferable. Also, if the thermal stress is less than 0.15f/denier, the sizing process during the sizing process will be approximately 0.15f/denier during drying. The potential bulkiness is lost during heat treatment under tension of 10ii'/denier. The B, W, 8 and thermal stress can be easily obtained by appropriately combining the surface temperature of the heating pin, F, F2, and relaxation rate.

In the present invention, drawing of the undrawn polyester yarn and non-uniform heat treatment of the highly shrinkable drawn yarn obtained by the drawing are carried out in succession, but the present invention can be carried out very easily by using an apparatus such as the one illustrated in FIG. dA can be performed. In the figure, the relaxation rate can be set by adding a step to the take-up sheet roller and changing the head as shown in Figure 8.

In addition, E, W, and s in the present invention refer to the length of the thread before and after hot water treatment by peeling off the thread, wrapping it in gauze without tension, immersing it in boiling water for 15 minutes, and air-drying it. It was measured by measuring. Further, the potential bulkiness was determined by visually observing the degree of micro crimp and expression of the sample after B, W and 8 measurements.

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

<Example> Polyethylene terephthalate with a relative viscosity (metacresol: 25° C.) of t63 was melt-spun using a spinneret with a unique spinning hole and wound at 1600 m/min to 3ax1a.
An undrawn polyester yarn having a birefringence of -s was obtained. The undrawn yarn was wound once around a pin heated to 85° C. using the device shown in FIG.
0 o 110 I+) to a 75 denier/66 filament high shrinkage drawn yarn with no thick/fine unevenness in the longitudinal direction of the fiber (35q6 B, W, S) and then continuously The threads were passed through an interlacing device with a pneumatic pressure of 2~/cm2, entangled, and then guided to pins with 16 round cross-section radii of curvature heated to 165°C.The speed of the threads running on the pins was 500. 7 minutes, the contact angle was 120 degrees, and the small diameter part of the multi-roller (diameter 95W) was used to collect the tome and chain thread.
n,) and subjected to yarn entanglement treatment and non-uniform heat treatment.
% relaxation rate condition. At this time, the running tension of the thread guided to the heated pin is 5? and
The running tension of the yarn guided from the heated pin to the take-up shear roller was 10 tons.

When we measured the number of repeated knots and spread parts along the longitudinal direction of the polyester yarn obtained as described above, we found that the difference between the weights was 100 to 120 per 1 meter, which was extremely small. Ta. Also, B, W, and S are 18%,
The dry heat constant longitudinal thermal stress at 100°C was 14F.

When the obtained polyester yarn with latent bulkiness was subjected to relaxation heat treatment in hot water under no tension, micro loops appeared and it exhibited excellent bulkiness. In addition, when a fabric woven using chain yarns for the warp and weft was dyed according to the usual method, there were no warps, H-stripes, or envelopment caused by latent bulky threads on the surface, and the quality was questionable. Not Naritch's silk-like canopy
Ii Naru〃・Ito et al./ko.

Comparative Example 1 In Example 1, a guide was installed between the interlacing device and the heated pinot to apply tension to the fiber bundle. Only polyester fibers with low pourability could be obtained.

〔Effect of the invention〕

According to the present invention, which has been completed as described above, 1('η A latent bulky polyester that has a soft texture and good drapability when the fabric is made bulky, and has excellent quality without creating warp lines, warp lines, or linear membranes or assemblies on the fabric surface. It is possible to easily obtain the yarn, and it is possible to provide on an industrial scale a polyester yarn with a uniform grain size, which is particularly suitable for use in high-grade silk-like thin fabrics, at a low cost.

[Brief explanation of the drawing]

Figure 1 is a side view of the yarn at a stage where the threads of the present invention have been entangled, and Figure 2 (a) is a side view of the yarn at the opening section. i1 song i prisoner, (
B) is a cross-sectional view, Figure 3 is a cross-sectional view showing the non-uniform heat treatment of the yarn on the heating/zeta pin in the present invention, and Figure 4 is the F of the yarn running on the heated pin. ;"l i"
. 1υrI angle diagram of the capital, Figure 5 is Polynismir 9 of the quotient contraction
, when IL drawn yarn is heat treated under relaxed conditions; 7
: (Explanatory drawing without showing an example of the relationship between the processing atmosphere temperature and B, W, S, Fig. 6 shows the upper ligature of the heated pin) Figure 7 is a side view showing an example of the device for carrying out the main light lj +q<+, Figure 8 is an oblique and perspective view of the take-up sheet roller used in Figure 7. , in FIGS. 1 to 8, (1) is the nodule, (2) is 1. IIJ ;'
, :j , y(, (21) added 21゛7jli Shibino,
(4) r, L undrawn yarn, (5) is fJ''#'?j
I+ -, y, (') 4-, :l: 9j, +411
Hing, (7) is small Furson Laura, (+-() li
, Take-up [1-Ra dog length: 15, (9) is take-up roller small 1:
:n? 'd(,!'t) ij inota v -s device N
”f,,Oυ(ha high contraction<!i; lit thread, (1:
4 (5-J, /i7 existent(:',';,j'5 (
Raw if! ' U Esthetic IL7 Thread, (1?, l rj
:Bahn・1)ro1゜

Claims (1)

[Claims] By subjecting undrawn polyester yarn to interlacing treatment in a relaxed state after stretching, knotted portions and spread portions are alternately formed along the longitudinal direction of the yarn, and subsequently, knotted portions and spread portions are formed on heating pins. Run for a short time to apply non-uniform heat treatment to individual structural fibers.
In particular, a method for producing a latent bulky polyester yarn, characterized in that it satisfies all of the following requirements (a) to (g). (a) The hot water shrinkage rate (B, W, S) of the thread after drawing is 15
~45%. (b) The number of repetitions of knotted portions and spread portions formed by interlace processing is 5 o or more per 1tyL. (c) Do not allow any object to squeeze the yarn between the interlacing device and the heating pin. B) The radius of curvature (b) of the heating pin is 5 to 50 tan, and the contact angle with the thread running on the pin is at least 90 degrees. (e) The surface temperature of the heating pin is 160 to 200 tan. ℃ash,
The contact time of the thread running on the pin is 5×10-5 to 15X
10-j seconds. (f) The running tension (Fl) of the thread guided to the heating pin is 0.
The running tension (F2) of the yarn guided to the take-up roller is 0.15 to 0.6 (3f') after being heat treated on the heating pin. /
Must be denier. ′(θ B, W of the latent bulky polyester yarn to be formed
, S is a factor of 50 or less, and the dry heat constant longitudinal thermal stress at 100° C. is at least 0.15 F/denier.