JPS5837416B2 - Polyester polyester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a false twisted yarn made of polyester filaments, which is a crimped yarn (hereinafter sometimes referred to as slub yarn) that has irregularities in thickness intermittently in the longitudinal direction of the crimped yarn. The present invention provides a method for manufacturing.

It is well known that woven and knitted fabrics made from false-twisted yarns made of polyester filaments are currently highly valued for their excellent bulkiness and moderate elasticity, and have established a unique product category.

However, it is often said that because the thickness of the threads is too uniform, the fabric has a flat appearance and lacks the depth and natural feel that is caused by the uneven thickness of the threads that is seen in spun yarns.

For this reason, an attempt was made to impart thickness unevenness to the false twisted yarn made of polyester filament system, thereby bringing the conventional flat appearance of the fabric closer to the deep, natural feel of spun yarn. It is being

For example, Japanese Patent Publication No. 48-19582 and Japanese Patent Publication No. 48-1958
Publication No. 9817 discloses that false-twisted yarns with different yarn lengths obtained by simultaneously false-twisting two or more filament systems with different yarn feeding amounts are rubbed against a rubbing body to create a yarn pool (hereinafter referred to as yarn pool). A method of manufacturing a slab yarn has been proposed in which yarns (sometimes referred to as slabs) are formed intermittently.

However, since the filament yarns of the false-twisted yarns obtained by these methods have poor binding properties between the filaments, when the yarns are rubbed, they may separate into the original filament system, or the formed slabs may become significantly longer. Phenomena such as this occur.

In addition, the obtained slab yarn easily separates into its original filament system due to "shidoki" or the slab slips, so that the slab yarn cannot be used as is.

The inventor of the present invention has proposed that in order to solve this drawback, two or more filament yarns are twisted after being twisted (hereinafter referred to as first twisting) and then subjected to a false twisting process to improve the binding property between the filament yarns. We considered that it would be effective to grant the grant and have repeatedly considered it.

As a result, if there is a birefringence difference between the filament yarns, it is possible to easily obtain a false-twisted yarn with a yarn foot difference and binding property even if it is subjected to false twisting in the pre-twisted state. This is what led us to the present invention.

That is, in the present invention, two or more types of polyester filament yarns having different birefringence indexes are combined, twisted, and then false-twisted, and at that time, the yarn is passed through a rubbing body provided on the untwisting side of the false-twisting device. This is a method for producing a polyester crimped yarn having uneven thickness, which is characterized by continuous or intermittent contact to intermittently generate yarn pools.

In general, synthetic fiber filament yarns have a double refractive index and a high elongation modulus.

As a result, when synthetic fiber filament yarns with different birefringence indexes (in other words, different elongation moduli) are twisted and twisted before being false-twisted, filament yarns with a small elongation modulus become dog filaments with a small elongation modulus. A false-twisted yarn is obtained in which the thread length is longer than the yarn, and the filament yarn is wound around a dog filament yarn with an elongated modulus by first twisting.

Since such false-twisted yarn has good binding properties between filament yarns, it does not separate into the original filament yarn even when rubbed, and furthermore, the slub can be controlled to an appropriate length by the wrapped yarn based on the first twist. .

In addition, the slub yarn obtained in this way is “iroki”
Since it is stable against water, subsequent weaving and knitting becomes easy.

Further, the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic side view showing an embodiment of the present invention.

Figure 2 shows the slab yarn obtained without pre-twisting.
FIG. 3 is a schematic diagram showing each slub yarn obtained according to the present invention.

In FIG. 1, 1 is a yarn obtained by twisting polyester filament yarns with different birefringence indexes after doubling, which is fed to a feed roller 3 via a guide 2,
The false-twisted processed yarn 6 obtained by being twisted by the false-twisting spindle 5 and then untwisted by the false-twisting spindle 5
During this process, the slack of the filament yarn, which has become longer due to the above-mentioned false twisting process, is squeezed and gathered intermittently in the length direction of the yarn. The crimped yarn, which has a shape of a yarn pool and is thus given uneven thickness, is sent out from a delivery roller 10 and rolled up into a cheese 12 by a friction roller 11.

The important point here is that the pre-twisted yarns made of polyester filament yarns having different birefringence indexes are subjected to false twisting and then rubbed.

It is preferable to adjust the difference in birefringence so that the difference in yarn length after the false twisting process is about 8% or more, so that a sufficient slab can be formed.

When this yarn foot difference is less than about 8%, the false twisted yarn tends to have little yarn slack and difficulty in forming a slab due to abrasion.

The thread difference mentioned here can be found in the following way. This is the value.

First, the false-twisted yarn was subjected to a false twisting process with a per denier of 0.1
Apply a load of 9 and mark both ends of a length of about 1 m.

Next, this is separated into filament yarns with different birefringence indexes, a load of 0.1.9 per denier is applied to each separated filament yarn, and the length between the marks previously marked is measured.

When the length of the longest filament yarn is t1 and the length of the shortest filament yarn is t2, { (t1-t2)/
t2}xi 00.

Further, it is necessary to first twist the filament yarn having the above-mentioned difference in birefringence index after doubling, then false twisting, and rubbing.

As shown in Figure 3, the slub yarn obtained in this way has good conjugation between the filament yarns because the filament yarns with a low birefringence are wound around the filament yarns with a high birefringence. No trouble occurs during the weaving or knitting process.

On the other hand, if the yarns are false-twisted immediately after doubling and rubbed without first twisting, the resulting slub yarn is as shown in FIG.

Since this slub yarn does not have a wound yarn based on first twisting like the slub yarn of the present invention shown in FIG. 3, the cohesiveness between the filament yarns is poor, and it easily separates into the original filament yarns by ironing. be.

Note that 41 and l2 in FIGS. 2 and 3 indicate the slab interval and the slab length, respectively.

The number of twists (T times/m) of the first twist applied in the present invention is the yarn foot difference (△L
%) preferably satisfies the condition expressed by formula [1].

Here, when the number T of first twists is decreased, the length 12 of the slab of the slab yarn obtained becomes a dog, and conversely, when the number of first twists is increased, 12 becomes small.

However, if the number of first twists T is increased beyond the value shown by the above formula 0, it tends to become difficult to form a slab.

In the present invention, if continuous processing is performed with the rubbing bodies T, 8, and 9 shown in FIG. 1 fixed, slabs will be generated at approximately constant intervals. By moving at right angles and making contact with and separation from the yarn intermittently, it is possible to change the slab spacing l2 in accordance with the intermittent period.

As the abrasive body, a material commonly used in textile processing is used, such as a chrome-plated or satin-plated metal rod or a titanium rod of an appropriate thickness.

In addition, in order to further improve the handling properties of the slub yarn obtained by the present invention, it is also possible to use the slub yarn obtained by the method of the present invention by heating it, or by providing an interlace nozzle or the like at the bottom of the rubbing body shown in FIG. Processing may be performed.

As mentioned above, since the slub yarn obtained by the method of the present invention has good conjugation between filament yarns, it can produce high-quality fabric without any trouble during the weaving and knitting process, and with a natural feel similar to spun yarn. It will be done.

Hereinafter, the present invention will be explained in detail with reference to Examples.

Example 1 Birefringence obtained by high-speed spinning is 0.06, total fineness is 1
13 denier, 24 filament polyester undrawn filament yarn, birefringence index 0.03, total fineness 11
After plying undrawn polyester filament yarns of 3 denier and 36 filaments, they were first twisted in the S direction at 180 times per meter using a ring twisting machine, and then stretched and false twisted under the following conditions according to Figure 1. Processed.

Heater length: 1m1 Stretching ratio: l. 5. False twisting spindle rotation speed + 40X1 0'rpm, number of twists; 1 in 2 directions
2500 times per meter, heater temperature: 200℃, rubbing body 7
, 8, and 9 are fixed as shown in Fig. 1, and the abrasive body has a diameter of 0.0 mm and has a satin-plated surface. 5 crrL round bar.

Here, the yarn length difference of the false twisted yarn before passing through the rubbing body is 25%.
A slub yarn shown in FIG. 3 having a fineness of 150 denier after rubbing was obtained.

This slab yarn has a slab spacing l1 of approximately 10 to 13 cx
, The length l2 of the slab is about 2 to 3 cm, and it is easy to handle in the weaving and knitting process as it is, and the obtained woven and knitted fabric is different from that made with conventional polyester false-twisted yarn due to the uneven thickness of the yarn. Compared to other fabrics, the appearance of the fabric had depth and a rich natural feel.

Example 2 Birefringence obtained by high speed spinning is 0.06, total fineness is 7
A polyester undrawn filament yarn of 5 denier and 36 filaments and a polyester drawn filament yarn with a birefringence of 0.17 and a total fineness of 75 denier and 25 filaments were aligned and combined, then a ring twister was used to create S.
After applying 50 twists per meter in the direction, false twisting was performed using the apparatus shown in FIG. 1 under the following conditions.

Heater length: 1m, false twisting spindle rotation speed: 40X
1 0' rpm, number of twists: 250 per meter in two directions
0 times, heater temperature; 200℃, overfeed;
-3%, the rubbing body was the same as in Example 1.

The obtained slub yarn has a fineness of 150 denier and a yarn length difference of 1
At 3%, the slab spacing l1 was about 8 to 10 c/rL, and the slab length l2 was about 3 to 4 CTL.

This slub yarn had good handling properties in the weaving and knitting process as it was, and the fabric appearance was also good.

Comparative example The same procedure as in Example 1 was carried out except that the first twisting was not performed.

The obtained slab yarn has a fineness of 150 denier as shown in Fig. 2, and the slab spacing l1 is about 50 to 60 crn.
1 The length l2 of the slab was about 5-10 CrrL.

Since such slub yarns tend to separate into the original filament yarns, it is necessary to twist the yarns 200 times per meter in the S direction, which is opposite to the false twisting direction during false twisting, to avoid rubbing the yarns as much as possible before knitting. There wasn't.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing one embodiment of the present invention, Figure 2 is a slub yarn that has been false twisted without first twisting and rubbed;
The figure shows a schematic diagram of a slub yarn obtained according to the invention.

Claims (1)

[Claims] 1. Two or more types of polyester filament yarns with different birefringence indexes are twisted after gold thread, and then false-twisted, and at that time, the yarn is continuously or A method for producing a polyester crimped yarn having uneven thickness, characterized by intermittent contact and intermittently generating yarn pools.