JPH0711096B2 - Method for producing latent polyester crimped yarn - Google Patents

Description

Description: TECHNICAL FIELD The present invention has a thermal shrinkage difference in the fiber axis direction of individual filaments and in the cross-sectional direction of multifilaments, and has a large and small thickness in the fiber axis direction of multifilaments. The present invention relates to a method for producing a polyester spun-like yarn having different wearing ability.

[Prior art and its problems]

In order to bring synthetic fiber multifilament yarns closer to natural spun yarns, various studies have been conducted for a long time.
Methods for producing spun-like yarns such as the Taslan processing method have been proposed.

However, although the spun-like yarns obtained by these production methods are closer to the spun yarns in terms of texture, appearance, etc., the synthetic fiber multifilament yarns are uniform in the fiber axis direction, and are natural spun yarns. Has not yet obtained a spunlike yarn having a delicate dyeing unevenness, which is one of the characteristics of the above. Japanese Patent Application Laid-Open No. 53-31844 discloses a technique relating to a spun-like yarn which emphasizes imparting a heathering or marbling effect by imparting a change in dyeability for the purpose of improving the drawbacks.

The technique disclosed herein is a method for producing a polyester filament yarn having a difference in heat shrinkage in the fiber axis direction and imparting a change in dyeability in the fiber axis direction.

However, the technique was sufficiently satisfactory in bulkiness due to difference in heat shrinkage and difference in dyeing ability due to thickness, but a multifilament yarn having a large and thin thickness that was nonuniformly drawn at a natural draw ratio NDR or less was used as a high temperature heating material. Since it is subjected to a high temperature heat treatment with a tension less than the heat shrinkage stress, the yarn strength is remarkably reduced due to the rapid thermal crystallization of the unstretched part, and fluffs and the like frequently occur during the high-order process or during the knitting and weaving. It was not practical. Furthermore, recently, it has been desired that the difference in dyeing ability be mild, but this is not satisfied.

Further, in JP-A-51-133522, a necking point has a depth by being stretched in the traveling direction at different positions between filaments and then nonuniformly heated at a temperature of the second transition point or higher. A technique for obtaining a multi-nylament yarn that gives color and texture effects is disclosed.

In the technique disclosed herein, the specific means of varying the position of the necking point between the filaments in the running direction does not consider the draw ratio at the time of drawing, and causes mechanical damage to the undrawn yarn. It is either given or stretched at a low temperature. For this reason, extremely low locations with a strength of 1 g / d or less are unevenly present on the surface and inside of the multifilament yarn, thereby improving the anti-snagging property.

However, in the multifilament yarn obtained by this technique, as in the case of the multifilament yarn obtained in JP-A-53-31844 described above, there are places where the strength is extremely low and the strength of the whole yarn is low, so There was a defect that the passability to the next process was poor and it was not practical.

[Object of the Invention]

The present invention is a polyester filament yarn having a thermal shrinkage difference in the individual filament fiber axial direction, and having a random thickness in the fiber axial direction of the multi-filament yarn,
There is a difference in dyeing ability due to dyeing, and it has a heathering effect or mild frosting effect and a large bulge. Furthermore, it has good thread-forming properties and high processability, and has a high yarn strength. It is intended to provide.

[Structure of Invention]

The object of the present invention is to stretch polyester highly oriented undrawn multifilament yarn having a natural draw ratio NDR of 1.1 or more and 2.0 or less non-uniformly, and to randomly form thick or thin pitches in the fiber axis direction of the multifilament. After that, it is supplied to the high-temperature heating element, and the heat of the heating element is contact-run with the high-temperature heating element for a short time so that the heat is not uniformly transferred to the entire filament-constituting filaments, and random differences in heat shrinkage and random winding When forming a crimp and then re-heat treating to make the crimp latent so that the crimp is wound, the stretching ratio D at the time of the nonuniform stretching and the temperature T (° C.) of the high temperature heating body are as follows:
This can be achieved by a method for producing a polyester spun-like yarn, which is characterized by simultaneously satisfying the expressions (1) and (2).

NDR × 1.0 <D ≦ NDR × 1.4 (1) (However, Tg represents the glass transition point (° C) of the polyester highly oriented undrawn multifilament yarn, and Tm represents the melting point (° C).) The present invention will be described in detail below.

First, the constituent requirement of the present invention is to use a polyester highly oriented undrawn multifilament yarn having a natural draw ratio of 1.1 or more and 2.0 or less as a feed yarn, and the draw ratio D in the non-uniform drawing to the natural draw ratio NDR of the undrawn yarn. NDR × 1.0 <D ≦ NDR × 1.4 (1) Nonuniform stretching is performed at a stretching ratio D such that the fibers are thick and thin along the fiber axis direction of the multifilament.

Further, when continuously traveling in contact with a high-temperature heating element at a tension of less than the heat shrinkage stress to form a random heat shrinkage difference and a random crimp, in the present invention, according to the value of the draw ratio D according to the following formula: It is necessary to change the temperature T (° C.) of the heating element.

The range of the natural draw ratio NDR of the polyester highly oriented undrawn multifilament yarn in the present invention is essential to be 1.1 or more and 2.0 or less. When the natural stretch ratio NDR is less than 1.1, the thick and thin effect becomes small when the film is stretched non-uniformly, and the effect of heathering or defrosting cannot be obtained. Further, when the natural draw ratio NDR exceeds 2.0, it is a so-called undrawn yarn, and the thick portion when unevenly drawn has a low orientation with respect to the fiber axis direction. Due to the rapid thermal crystallization of the thick portion, the yarn strength is remarkably reduced, which is impractical. The range of the natural stretch ratio NDR is more preferably 1.3 or more and 1.8 or less in order to further exert the effects of the present invention.

The present invention has a natural draw ratio NDR of the polyester highly oriented undrawn multi-filament yarn, which is the supply yarn,
When the draw ratio D in the non-uniform drawing is lower than the lower limit of the expression (1), the ratio of the thick part becomes too large and the temperature is liable to be influenced by the temperature when the high-temperature heating body is made to travel, and the yarn strength is lowered. The contrast of light and shade due to the difference in dyeing ability becomes too large.

On the other hand, when the stretching ratio D exceeds the upper limit of the ratio (1), uniform stretching is achieved, the difference in dyeing ability is eliminated, and the effect of heathering or marbling is less likely to be exhibited.

In order to exert the effect of the present invention more, the stretch ratio D is NDR ×
The range of 1.1 <D ≦ NDR × 1.3 is preferable.

Furthermore, there is a close relationship with the high-temperature heating body temperature T, and at a temperature lower than the lower limit temperature of the equation (2), an appropriate difference in thermal contraction does not occur due to insufficient heat treatment, and the swelling feeling becomes poor.

On the contrary, when the temperature exceeds the upper limit, the yarn strength is lowered due to thermal deterioration of filament.

In order to further exert the effects of the present invention, the temperature T (° C) of the high temperature heating element is set to It is preferable that

The proper range of the draw ratio D and the temperature T of the high temperature heating body (° C.) is shown by the shaded area in FIG.

Next, the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a side view model diagram showing an embodiment of the present invention, and is implemented as follows, for example. Highly oriented unoriented multifilament yarn of polyester, which is the raw yarn to be supplied (1)
Between the feed roller (2) and the drawing roller (5), that is, while heating with the heating pin (3) in the nonuniform drawing region, the fiber of the multi-filament yarn at the draw ratio D defined by the above formula (1). Non-uniform stretching is performed while forming thick and thin in the axial direction. Since the non-uniformly drawn multi-filament yarn has a relatively low degree of orientation and a high degree of orientation scattered along the fiber axis direction, a difference in dyeing ability is exhibited, and a hedonic or marbling effect is obtained.

Highly oriented polyester unstretched multifilament yarn (1)
In order to draw thick yarns, a drawing method using a heating pin as shown in Fig. 1 is preferred because it does not reduce the difference in shade during dyeing of spun-like yarns, and the temperature is (Tg-15
C.) to (Tg + 50.degree. C.) are preferred. It should be noted that as the stretching temperature becomes higher, the length of the thick portion becomes shorter and the quantity also decreases.

Further, FIG. 2 is a side model view showing another embodiment of the non-uniform stretching area in FIG. 1, but as shown in FIG. 2, the feed roller roller (2) and the stretching roller (5) are connected to each other. It is preferable that a heating hot plate (4) is further provided after the heating pin (3) in the non-uniform stretching region and heat treatment is performed to disperse thick and thin between filaments, and to obtain a well-known mottled or frost-decreasing effect. That is.

As shown in FIGS. 1 and 2, the multifilaments randomly formed in the axial direction of the fiber are continuously connected between the stretching roller (5) and the relax roller (8) by the formula (2). In the high temperature heating body (7) having a temperature T (° C.) specified in 1., a filament which does not come into contact with a filament which comes into contact with the inside high temperature heating body (7) of the constituent filament yarn, preferably with a tension of less than the heat shrinkage stress, is generated. In addition, the temperature of the high-temperature heating element is contact-run for a short time so that it does not uniformly propagate to the entire constituent filaments, non-uniform heat treatment is applied, and yarn length difference, crimping, etc. are given due to the difference in heat shrinkage, and then heat treatment is performed again. The latent crimp is made latent and wound as a spun-like latent crimped yarn by a winding device (11).

Further, a vibration imparting device (6) is provided in front of the high temperature heating body (7) in order to smoothly run on the high temperature heating body (7) and to further develop a yarn length difference and crimp due to a difference in heat shrinkage, It is preferable to vibrate the constituent filaments.

FIG. 3 is a side model view showing another embodiment before the winding device in the step of FIG.

The spun-like yarn which has been subjected to the non-uniform heat treatment and which has exited the relax roller (8) is not directly wound by the winding device (11) but is again heat-treated by the reheating hot plate (9) as shown in FIG. It is necessary to wind the winding device (11) through the take-up roller (10).

When the heat treatment is performed again in this way, the crimps formed by the difference in heat shrinkage are erased and become latent.

〔The invention's effect〕

The spunlike yarn obtained by the manufacturing method of the present invention as described above has the following characteristics.

The thick and thin polyester yarns have different dyeing ability, so they can give effects from heather to mild marbling that cannot be obtained with uniform synthetic fibers, and a natural mottled feeling like natural fibers. A spunlike yarn can be obtained.

A polyester spunlike latent crimped yarn having high yarn strength and good spinnability due to the synergistic effect of an appropriate drawing ratio D and the temperature T of a high-temperature heating element and latent crimping be able to.

The natural stretch ratio NDR in the present invention means that the polyester highly oriented unstretched multifilament yarn obtained in a conventional spinning step is left at room temperature for 1 week, and then the automatic recording type elongation tester (UT-III manufactured by Toyo Baldwin) is used. -100), sample length 50
mm measured at a tensile speed of 200 mm / min
It is calculated from the elongation E (%) in the constant stress elongation region of the −S curve as follows.

Further, as a measuring machine, a commercially available Uster Evenness Tester (manufactured by Keisokuki Kogyo Co., Ltd.) is used as a measuring machine for Worcester yarn unevenness in Examples described later. Select the measuring slot to be used according to the total denier of the yarn, and set the yarn speed to 4 m / min and give a rotation of about 1500 rpm with a false twisting machine to perform false twisting and measure by the normal test. Worcester uneven curve is chart speed
Make it draw at 25 m / min. U% is read as a thread unevenness for 3 minutes by an integrator attached. U% is a value obtained by measuring at least 5 times, once for 3 minutes, and expressing it as an average value.

Hereinafter, the present invention will be specifically described with reference to examples.

Example 1 A highly oriented undrawn polyethylene terephthalate yarn having a natural draw ratio NDR of 1.45 was unevenly drawn at a yarn speed of 300 m / min by a drawing system using a heating pin at a temperature of 80 ° C. shown in FIG.
Continuously contact the high-temperature heating element at a relaxation rate of 8%, and then run the 120 ° C reheating hot plate as shown in Fig. 3
5 ^D -36 obtain a polyester spun-like latent crimp yarn ^F.

Cylindrical knitting is performed using the yarn, and the dye Amacron Blue (Amer
Staining was carried out under the conditions of 1.0% owf (manufactured by ican Color & Chemical Corp) and 10% owf, an auxiliary agent Sun Salt (manufactured by Nichika Chemical Co., Ltd.).

Table 1 shows the draw ratio, high temperature heating element temperature, other processing conditions, and the results of the obtained polyester spun-like yarn.

The Tg of polyethylene terephthalate used was 70 ° C,
The Tm was 260 ° C.

Experiment Nos. 1 to 5 in Table 1 were conducted by changing the stretching ratio, and Experiment Nos. 1 and 5 are comparative examples for clarifying the effect of the present invention.

Experiment No. 1 was non-uniformly drawn at a draw ratio lower than the draw ratio required for the present invention, and although it had a sufficient bulging feeling, it had a too dark and light contrast and lacked a natural feeling, and the yarn strength was extremely low. It lacked sex.

Experiment No. 5 was drawn at a draw ratio higher than the draw ratio required for the present invention, and although it was sufficiently satisfactory in terms of yarn strength, it was a completely uniform draw, and no mottled or marbling effect was obtained.

On the other hand, Experiments Nos. 2 to 4 satisfying the requirements of the present invention had a swelling feeling, a good heathering effect and a marbling effect, and were practically good in terms of yarn strength.

Experiments Nos. 6 to 10 were conducted by changing the temperature of the high temperature heating element, and Experiments Nos. 6 and 10 were comparative experiment examples for clarifying the effect of the present invention.

Experiment No. 6 was heat-treated at a temperature lower than the temperature range of the high-temperature heating element of the present invention. Therefore, although a good heat and frosting effect was obtained, the swelling feeling of the knitted fabric was weakened.

Experiment No. 10 was heat-treated at a temperature higher than the range of the high-temperature heating body temperature required for the present invention, and although it had a good heathering and marbling effect, the yarn strength was extremely reduced and it was not practical. It was a thing.

On the other hand, Experiment Nos. 7 to 9 satisfying the requirements of the present invention had a swelling feeling and a good heather or marbling effect and were practically effective in terms of yarn strength.

Experiment Nos. 11 to 13 are those in which the temperature of the heating pin was changed during the drawing process, and the one with a mild heat-draining effect to the one with a moderate heat-shaping effect with contrast of light and shade was obtained. It was also satisfactory in terms of strength.

Example 2 After producing highly oriented undrawn multifilament yarns having different natural draw ratios NDR, the highly oriented undrawn yarns were drawn with a heating pin at a temperature of 80 ° C. shown in FIG. m
After inhomogeneous stretching at in, it was continuously run in contact with a high temperature heating element at a relaxation rate of 8%, and then 120 ° C as shown in Fig. 3.
The reheated hot plate was run to obtain a polyester spun-like yarn of 75 ^D- 36 ^F.

Table 2 shows the drawing ratio, the temperature of the high temperature heating element and other processing conditions, and the results of the obtained polyester spun-like yarn.

Experiment Nos. 14 and 17 in Table 2 are comparative examples for clarifying the effect of the present invention.

Experiment No. 14 used a so-called undrawn yarn with a natural draw ratio NDR of 2.2, so the thick portion was not oriented with respect to the fiber axis direction, and the rapid thermal crystallization of the thick portion when running in contact with a high-temperature heating element. As a result, the yarn strength was extremely reduced, and it was not practical.

Experiment No. 17 used a highly oriented undrawn multi-filament yarn with a natural draw ratio NDR of 1.05, which was very small, so that the thick and thin effect was small and no mottled or marbling effect was obtained.

On the other hand, Experiment Nos. 15 and 16 satisfying the requirements of the present invention had a bulge and a good heat and marbling effect, and were practically effective in terms of yarn strength.

[Brief description of drawings]

FIG. 1 is a side view showing one embodiment of the present invention, FIG. 2 is a side view showing another embodiment of the non-uniform stretching region of FIG. 1, and FIG. 3 is shown in FIG. It is a side model figure showing another embodiment before the winding device of the process of. FIG. 4 is a graph showing the proper stretching ratio D and the proper temperature range of the high temperature heating body temperature T in the present invention. 1 ... Polyester highly oriented unstretched multifilament yarn 2 ... Feed roller 3 ... Heating pin 4 ... Heating plate 5 ... Stretching roller 6 ... Vibration imparting device 7 ... High temperature heating element 8 ... Relax Roller 9 …… Reheating hot plate 10 …… Take-up roller 11 …… Winding device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-143515 (JP, A) JP-A-57-112428 (JP, A) JP-A-55-76123 (JP, A) JP-A-59- 179808 (JP, A) JP-A-51-133522 (JP, A)

Claims (1)

[Claims] 1. A polyester highly oriented unstretched multifilament yarn having a natural stretch ratio NDR of 1.1 or more and 2.0 or less is nonuniformly stretched to randomly form a fine pitch in the fiber axis direction of the multifilament. , Supplying to the high-temperature heating element, the heat of the high-temperature heating element is made to contact the high-temperature heating element in a short time so that the heat is not uniformly transferred to the entire filaments constituting the yarn,
Random heat shrinkage differences and random crimps are formed on individual filaments, and after that, when heat treatment is performed again to make the crimps latent and wound, the draw ratio D at the time of the non-uniform drawing and the high temperature heating. A method for producing a polyester spun-like latent crimped yarn, characterized in that the body temperature T (° C) simultaneously satisfies the following formulas (1) and (2) NDR × 1.0 <D ≦ NDR × 1.4 (1) (However, Tg represents the glass transition point (° C) of the polyester highly oriented undrawn multifilament yarn, and Tm represents the melting point (° C).)