JPS58191211A - Production of mixed yarn - Google Patents

Abstract

PURPOSE:A synthetic resin is melt-extruded into filaments, the filaments are divided into 2 groups of filaments, one of the groups is collected by means of an air nozzle, then both are taken up together at a high speed to produce a mixed yarn with good touch and appropriate fulness, because of the specific value of boiling water shrinkage ratio between them. CONSTITUTION:A thermoplastic synthetic resin such as polyethylene terephthalate is melt-extruded through the spinneret 1 into filaments, the filaments are divided into groups A and B, passed through the horizontally blowing chimney 2. Then, one of the filament groups A is collected with an air nozzle 3, passed on the guide 4 and united with the other group B, treated with the finishing oil and taken up at a speed over 3,500m/min by the goddet rollers 6 to produce the objective mixed yarn with less than 0.5 ratio of boiling water shrinkage of the collected group to the untreated group.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing yarn for woven or knitted fabrics having a good feel and appropriate bulge at a low cost.

Traditionally, we have used a mixed yarn in which a group of filaments with a large single denier (hereinafter, this term is used to mean a single fiber denier) is arranged in the core of the multifilament, and a group of filaments with a small denier is arranged in the surface layer 1i141. It is known that woven or knitted fabrics with a soft surface feel and fullness can be produced by using the above method. In this case, the multifilament with the two-layer structure is usually produced by subjecting the mixed multifilament to a shrinkage/relaxation heat treatment in which the shrinkage rate of the yarn with a large single filament denier is made larger than the shrinkage rate of the yarn with a small single filament denier. can get. On the other hand, looking at the spinning process of such raw yarn,
It is necessary to separately spin yarns with different single yarn deniers, which has the disadvantage of lowering the raw noodle quality and increasing costs.
Regarding fine denier yarn, which is expected to increase in cost in the future, the above-mentioned high cost cannot be ignored.

On the other hand, in order to eliminate the above-mentioned fire source, in the spinning process, filament groups are divided into two or more filament groups and discharged from spinning nozzle groups with different cross-sectional areas or cross-sectional shapes, and after cooling, they are combined and wound. There is a way to get it. With this method, it is possible to produce groups of filaments with different single filament deniers and cross-sectional shapes in step 4 of the spinning process, which improves the silkiness.
It will be advantageous in terms of cost.

However, the spun mixed fiber yarn V Koyoru W & knitted fabric has the disadvantage that the surface feel is poor (and the texture is stiff).This is because the single yarn denier is small during spinning. Or, as a result of high spinning tension acting on filaments with a high degree of irregularity, the orientation of the molecular chains becomes high, resulting in low elongation and flattening. This is because the tension becomes weaker, resulting in lower elongation and lower shrinkage.As a result, when a woven or knitted fabric is subjected to shrinkage and relaxation treatment, filaments with a small single denier or with a high degree of irregularity gather in the core. In this case, filaments with a large single denier or with a low degree of irregularity gather in the surface layer, resulting in a woven or knitted fabric with poor texture.1 The present invention is dedicated to solving the drawbacks of the conventional spinning method. As a result of repeated studies, we found that even when simultaneous spinning is performed, it is possible to significantly adjust the filament σJ orientation and yield percentage by creating a special air resistance difference between the filament groups that are discharged separately. In other words, the present invention involves dividing a thermoplastic synthetic resin into two or more filament groups, melting and discharging the resin, and after cooling, one filament group is subjected to a focusing process using an air nozzle, and then the other filament group is combined with the other filament group. It is characterized by making the submergence shrinkage rate of the group of filaments subjected to the focusing process by doubling and taking them off at a speed of at least azoom/min to 0.5 times or less of the submersible shrinkage rate of the group of filaments that are not subjected to the convergence process. A method for using IO! of a mixed yarn is provided.

The thermoplastic resin used in the present invention is not particularly limited as long as it can be melt-spun, but polyester and polyamide are generally preferred. These resins may contain any desired organic or inorganic substance in the form of a blend or copolymer.

In the present invention, these thermoplastic synthetic resins are divided into two or more filament groups and melted and discharged, but the kneading may be discharged from a plurality of separate spinnerets or from the same spinneret. Good too.

After cooling, one filament group among these plurality of filament groups is subjected to a focusing process using an air nozzle such as an increment nozzle or a false twist nozzle. Note that the term "convergence processing" as used herein means a temporary or provisional convergence state of the yarn passing through the nozzle on the upstream side of the nozzle. That is, in an interlace nozzle, the yarn vibrates in a bundled state as a whole on the upstream side of the nozzle, and in a false twisting nozzle, the yarn is bundled by false twisting. In the present invention, this focusing phenomenon is utilized to substantially reduce the surface roughness of the filament group, thereby reducing air resistance and lowering the spinning tension. Therefore, the orientation of the molecular chains of the filament group becomes low, the elongation becomes high, and the shrinkage rate becomes low. On the other hand, for the filament group that is not subjected to the focusing process, the yarns run in an open state, so air resistance acts on each single yarn, and as a result, the spinning tension increases. Therefore, the molecular orientation of the unfocused filament is high, the elongation is low, and the shrinkage rate is still high.

Since the take-up speed of spinning in the present invention utilizes air resistance as much as possible, the effect becomes more pronounced as the spinning speed becomes higher. In order to achieve the object of the present invention, it is necessary to perform high-speed spinning at a spinning take-off speed of 3500 m/min or more.

If the spinning take-off speed is less than 35,007 H/min, the difference in air resistance is small and a spun blend yarn having the desired difference in structural and physical properties cannot be obtained.

In order to obtain the spun mixed fiber yarn that is the object of the present invention, it is necessary that the submerged shrinkage rate of the bundled filament (%) be 0.5 times or less than the submerged shrinkage rate of the filament group that is not subjected to the focusing process. Must have value. When the boiling-to-boiling ratio exceeds 0.5, it is difficult to express fullness in the woven or knitted fabric.

Furthermore, in order to improve the feel of the woven or knitted fabric, it is preferable that the average single yarn denier of the filament group subjected to the focusing treatment using an air nozzle is not larger than the average single yarn denier of the filament group that is not subjected to the focusing treatment. Conversely, if the average single filament denier of the bundled multifilament is large,
When subjected to contraction/relaxation treatment as a woven or knitted fabric, filaments with a small single denier are concentrated in the core, and filaments with a large single denier are located in the surface layer, resulting in a rough surface (
This is because the texture becomes loose.

Embodiments of the production of mixed fiber yarn in the present invention will be explained with reference to the accompanying drawings. The filament group A is focused by an air nozzle 3 provided downstream of the spinning Ll metal 1. Note that P is the focus starting point. On the other hand, the filament group B runs in an open state until it reaches the guide 4. Next, both filament groups are doubled, oiled by an oiling roller 5, and further wound up via a godet roller 6.

In the present invention, it is generally preferable that the running distance of the non-focused filament group B in the opened state (distance between the base 1 and the guide 4) is long in order to increase the difference in air resistance between the non-focused filament group B and the focused filament group A. However, if it becomes too long, especially 4
When spinning at high speeds of 5oOm/min or more, single yarn breakage tends to occur, so the running distance is 2.5@6 or more.
Votes or less are generally preferred.

The spun blend yarn according to the present invention can be drawn after being wound or directly connected to the spinning process without being wound. However, when the spinning take-off speed is sufficiently high, such as 4 SOOm/min or more, the molecular orientation becomes high and oriented crystallization occurs, so that it can be put to practical use without drawing.

This case is more preferable in terms of streamlining the yarn spinning process.

In addition, for the spun-blended yarn according to the present invention, yarn entanglement is performed by using an interlacing nozzle or the like in the spinning or drawing process or in subsequent steps in order to improve the mixing properties between the filaments or to provide entanglement between the filaments. You can also add processing.

As described above, the present invention provides a method for rationally manufacturing at low cost a mixed yarn having an appropriate bulge, good feel, and 1MA touch when it is made into a woven or knitted fabric. The meaning is extremely large.

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

Example 1 1 polyethylene terephthalate with an intrinsic viscosity of 0.64
After drying at 60'C for 4 hours and melting, it was discharged from a spinneret having 48 Y-shaped discharge holes in the middle. The discharged filaments were divided into two groups of 24 filaments each and wound up as shown in the diagram.

At this time, the distance from the base 1 to the upper end of the side-blown cooling cylinder 2 is o,
+@, the length of the side-blown cooling cylinder is -0.8 m, and the distance from the nozzle to the interlace nozzle 3 is 5 fi.

The distance from the cap to the focusing starting point P is approximately 1.3 fi.

The distance from the cap to the guide 4 was 5.1 fi.

Also, the air pressure of the interlaced nozzle is l −5 kg/c
d.

The speed of the godet roller 6 and the winder (not shown) is 5.
It was 000.7 minutes.

For comparison, yarn spinning was carried out under exactly the same conditions as above, except that the interlace nozzle 3 was removed from the figure.

Table 1 shows the physical properties of the yarn obtained as described above and the texture of the tube-knitted-submerged sample.

Table 1 - Sample yield rate when immersed in water at 1 m for 15 minutes The spun blended yarn of the present invention shows a large difference in physical properties in filament #darkness, and as a result, the tube-knitted Sumoto-treated sample Comparative Example 1 has a good feel (having a stiff feel), and Comparative Example 71 has only a paper-like feel because there is little difference in physical properties between the filaments.

Example 2 Example 1 except U where the filament denier is changed in various ways
3. The physical properties of the yarn are shown in Table 2.

Table 2 ff11 to ff3 are based on the present invention, and since the shrinkage ratio between the filament groups is sufficiently large, the submerged tube-knitted sample exhibits a good sense of fullness.

On the other hand, N4 has a large single yarn denier in °C.
The air resistance force per unit weight acting on each single yarn is relatively reduced. As a result, the difference in physical properties between the filament groups becomes smaller, and in particular, the ratio of water manufacturing shrinkage ratio of A to B exceeds O and S, so that the submerged tube-knitted sample does not show any bulging feeling. .

Example 3 Taking over spinning yarn i! Silk spinning was carried out in the same manner as in Example 1, except that the A degree (speed of the godet roller 6 and winding machine) was variously changed. Table 3 shows the physical properties of the yarn at this time.

Dimensions 2 and 3 are according to the present invention, and since the shrinkage ratio between the filament groups is sufficiently large, the submerged tube-knitted sample exhibits good bulge.

On the other hand, in case 1, the spinning speed is low, and the air resistance force acting on the single yarn decreases. In particular, since the boiling yield ratio of A to B exceeds 0.5, the sample in which N1 and No. 1 were subjected to stretching heat treatment using a separate root does not have a bulging feeling.

Example 4 Example except that the average single yarn denier and number of filaments of filament group A and the average single yarn denier and number of filaments of filament NB were variously changed by changing the number of discharge holes and the cross-sectional area of the discharge holes of the spinning nozzle. Silk spinning was carried out in the same manner as in 1. Table 4 shows the physical properties of the yarn at this time.

In the case of the 4th table 2, the difference in physical properties between the filament groups is large.
The fluffiness of the submerged sample increases. However, since the filament formed in the core l-p B has a small single filament yarn, it has a smooth texture, which is not desirable except for special uses.

In the case of Length 1, since the single yarn denier of filament group B was larger than that of filament group A, it exhibited a stiff texture and a soft feel.

[Brief explanation of drawings]

The accompanying drawings are schematic diagrams illustrating one embodiment of the invention. 1... Spinneret 2... Side-blown cooling cylinder 3...Air nozzle 4...Guide 5... Oiling roller 6...Godet a-ler

Claims (3)

[Claims] (1) Thermoplastic synthetic resin is divided into two or more filament groups, melted and discharged, and after cooling, one filament group is subjected to a focusing process using an air nozzle, and then combined with the other filament group to form 3,500 m7 filament groups. The boiling water shrinkage rate of the filament group that has been bundled by taking it off at a speed of more than 1 minute is the boiling water shrinkage rate of the filament group that has not been bundled.
．． A method for producing a mixed fiber yarn whose % target is to have a F of 5 times or more. (2) The average single filament denier of the filament group subjected to the focusing treatment by an air nozzle is not greater than the average single yarn denier of the filament group not subjected to the focusing treatment. , (3) Pick-up speed is 4500. / A method for producing a mixed yarn according to claim 1, which is a preparative method.