JPS6040535B2 - Manufacturing method of special bulky yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a special bulky yarn made of thermoplastic multifilament yarn and having a texture and appearance similar to a spun yarn.

It is a well-known technique to create loop yarn by creating loops or entanglements in a turbulent region of fluid by the action of flies, and to create fluff by rubbing the surface layer of the loop yarn. Kosho 47-126738
Publication No. 51-136941.

This method has the disadvantage that the loop yarn has a low entanglement strength, which causes the following problems. That is, since the entanglement strength of the loops is low, the loops disappear under the tension during abrasion, and the center of the multifilament is abraded, resulting in the resulting bulky yarn having extremely low strength and elongation. Since the yarn is like a brushed multifilament, the bulkiness is significantly inferior, and the fluff tends to fall out or move, resulting in unraveled yarn breakage during knitting, and the formation of neps and pills when used as a fabric. It has disadvantages such as: As a method to increase the entanglement strength of loop yarns, two or more multifilaments are introduced into the fluid turbulence area at different feeding speeds, and the yarn with the higher feeding speed is placed on the sheath side.
It is well known that the yarn with a low feeding speed is placed on the core side.

In this method, the filament on the core side and the filament on the sheath side are entwined with each other, and the core side holds the loop on the sheath side, thereby increasing the strength of the loop entanglement. Further, a method of rubbing the core and the loop yarn having the sheath structure to impart fluff is known from Hakama Kosho No. 39-124334. Since this method has high loop entanglement strength,
It is easy to control the number of fuzz and the length of the fuzz, and the processed yarn obtained is bulky, and since the fuzz is entangled with the core yarn, there is no shedding or movement, and there is no occurrence of neps or pills. Although it has the advantage, the need for two or more yarn supply systems is because the feeding speeds are different, so when using yarn of the same denier, there will be a difference in the amount of yarn used. This is not preferred as production equipment because it has the operational disadvantage of increasing the number of replacements. Furthermore, the obtained processed yarn has disadvantages such as a significant decrease in elongation due to abrasion and a tendency to breakage in higher-order processes. The object of the present invention is to solve the drawbacks of the prior art in the method of fluffing after fluid turbulence treatment, namely, the low entanglement strength of the loop yarn, the need for two or more yarn supply systems, and the equipment aspects. The purpose is to solve the problems of operational complexity and low elongation of the obtained bulky yarn, and
It is an object of the present invention to provide a method for producing an excellent bulky yarn having high passability through higher-order processing without concerns about shedding or movement of fuzz or reduction in strength and elongation.

That is, in the present invention, a blended yarn consisting of polyester filaments and composite polyester filaments having latent crimp ability is subjected to a relaxing heat treatment to develop crimp of the composite polyester filament and to reduce the yarn length difference between the filaments of the yarn. After developing, a fluid turbulence process is performed at a fluid pressure of 3k9/ground (G) or more to form loops or entanglements, and then fuzz is formed by rubbing at a friction tension of 0.0key/d or more. This is a method for producing special bulky yarn. In the above, one of the polyester filaments to be interwoven refers to a polyester filament that is made of a single component and is not a composite yarn.

On the other hand, composite filaments are polyester filaments that have a latent curling ability and develop crimp by drying or moist heat treatment, or even if crimp is apparent, they further develop crimp by dry heat or moist heat treatment. In order to have the ability to develop warp, it is obtained by composite spinning polyester polymers with different heat shrinkage rates in a side-by-side type or an eccentric sheath-core type. Components with different heat shrinkage rates include components with the same chemical composition but different degrees of polymerization, components with the same chemical composition as the main component, and components in which different compounds are copolymerized or mixed on one side. The method for manufacturing bulky yarn of the present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic diagram showing a preferred process of the method for manufacturing bulky yarn of the present invention, in which a polyester multifilament blended yarn 1 consisting of two types of ordinary polyester filaments and composite polyester filaments is unraveled to suppress fluctuations in tension. After being supplied to the roller 4 through the tensor 3, the polyester filament is placed between the roller 4 and the roller 6 under overfeed conditions in a non-contact manner or in contact with the heating element 5 to form curling stripes on the polyester filament having latent crimp ability. As a result, after creating a yarn length difference between the filaments of the yarn, fluid treatment is performed by a fluid turbulence nozzle 8 between rollers 6 and 9 under overfeed conditions, constant length conditions, or tension conditions. Provides loops and entanglements.

Next, the yarn is rubbed by a rubbing body 10 between the roller 9 and the loaf 11 to give fluff, and then wound up by a winder 12. In the present invention, the raw yarn to be supplied is polyester, and must be a multifilament mixed yarn consisting of ordinary polyester filaments and composite polyester filaments at the supply roller 4.

The temperature of the heating element 5 is 2.
It is necessary to set the temperature to be at least the next transition point, and there is no limitation as long as the temperature is such that the composite polyester filament can develop crimp, but it is preferably 130 qo or higher, and more preferably 160° C. or higher. Further, when the yarn is run on the heating body, the space between the rollers 4 and 6 must be under overfeed conditions, and the overfeed rate is preferably 5% or more, more preferably 10% or more. The fluid pressure when performing fluid turbulence processing is not limited as long as it is a fluid pressure that can cause loops or entanglements, but from the point of view of improving the entanglement strength of the loops, it needs to be 3k9/G (G) or more. Furthermore, 4 kg/(G) or more is more preferable. The yarn supply conditions to the fluid turbulence region can be constant length conditions, tension conditions, or overfeed conditions because there is a yarn length difference between filaments, and loops and entanglements can be formed. Although there are no limitations as long as the conditions are met, it is preferable that the overfeed rate is equal to or higher than that at which a yarn length difference remains. Note that it is desirable to provide a moisture applicator 7 between the roller 6 and the fluid turbulence nozzle 8 because the strength of loop entanglement is improved if moisture is applied to the multifilament before the fluid turbulence treatment. The tension during the scratching process with the scraping body is not limited as long as it is tension that can generate fuzz, but it is necessary to set the tension between the scraping body 10 and the roller 11 to 0.05 g nod or more, ．．
The range of 0.07 to 0.5 g/d is more preferable.

However, the denier d here is the denier of the multifilament mixed yarn fed to the heating element treatment. The material and shape of the abrasive body are made of artificial abrasives made of particles such as fused alumina, artificial corundum, carborundum, and boron carbide, and natural abrasives and binders made of fine powders such as silica sand, anhydrous silicic acid, and diamond. Items that have been attached to the surface of metal, cloth, paper, etc. with adhesive, items that have an uneven lees surface such as natural tissue, or items that can generate fluff by abrading threads such as sharp blades with uneven surfaces. In that case, it can be anything and is not limited to a specific material or shape. It is also possible to actively rotate the abrasive body in the direction in which the yarn travels or in the opposite direction, to rotate only by the running tension of the yarn, and to continuously move the thread abrasive portion of the abrasive body. Here, the following method can be used to obtain a blended yarn of a normal polyester filament and a polyester having latent crimp ability used in the present invention. For example, in the spinning process, (1) a normally spun polyester undrawn yarn and a composite edged polyester undrawn yarn are combined and wound up;

■ Discharge regular filament and composite filament from different discharge holes of the same nozzle.

It can be obtained by drawing undrawn mixed yarn obtained under various spinning conditions.

In addition, in the stretching process, for example, A. An undrawn yarn made of ordinary polyester filaments and an undrawn yarn made of composite polyester filaments are pulled together and drawn together.

B. A drawn yarn made of ordinary polyester filaments and an undrawn yarn made of composite polyester filaments are each drawn separately and wound up using the same winding machine.

It can be obtained by stretching using various stretching conditions such as.

Others, for example. A drawn yarn made of ordinary polyester filaments and a drawn yarn made of composite polyester filaments are electrospread and then mixed together.

B. A drawn yarn made of ordinary polyester filaments and a drawn yarn made of composite polyester filaments are simply aligned and supplied.

It can be obtained by etc.

Each component of the present invention will be specifically explained.

{1} By tsuru-weaving ordinary polyester filaments and composite polyester filaments with latent winding ability, the difference in yarn length caused by relaxation heat treatment becomes remarkable, and the loop entanglement strength is extremely improved.

'2} The purpose of treating yarn with fluid turbulence is to generate loops that serve as places to cut to generate fluff, and at the same time to create entanglements that provide morphological stability to prevent fluff from falling out or moving. As a result, a bulky yarn that satisfies bulkiness, fluffiness, anti-pilling properties, strong elongation, etc. can be obtained.

The purpose of rubbing the glue is to generate fluff, and if the tension is less than 0.05 g/d, the amount of fluff generated is small and it is difficult to obtain a substantial fluffy feeling.

Therefore, the abrasion tension must be 0.0 acid/d or more, preferably 0.07 to 0.0. It is better to call it Oni no d.
In the present invention, the process of subjecting the mixed fiber yarn made of ordinary polyester filaments and composite polyester filaments to a relaxation heat treatment, subjecting them to fluid turbulence treatment, and then causing them to run in contact with an abrasion body contributes to the following process characteristics.

In other words, by subjecting the blended yarn to a relaxing heat treatment, the filaments with latent crimp ability will be crimped, a difference in length between them and normal filaments will occur, and the shrinkage of the normal filaments will be reduced to latent crimp ability. If the filament is larger than a filament having a crimped filament, the normal filament forms the core part and the crimped filament forms the sash part in the fluid turbulence treatment process.

On the other hand, when the magnitude of contraction is opposite, the normal filament forms the sheath part and the crimped filament forms the core part. The loop yarn with a core and sheath structure obtained in this way has the loop firmly fixed inside the yarn, making it very stable. As a result, the loops do not easily move or disappear even when a tension that is much higher than that used to normally handle threads, including high-level processing, has excellent morphological stability. Therefore, even if fluff is generated due to abrasion, the morphological stability does not decrease. Here, a loop yarn with a core and sheath structure is a normal loop yarn with no difference in yarn length, but when the filaments are moved by a fluid, they become a core or a sheath in the longitudinal direction of the yarn, forming a loop yarn. On the other hand,
A loop yarn in which a group of filaments in the longitudinal direction mainly forms a loop and other groups of filaments mainly form a core is called a loop yarn with a core structure.

The yarn obtained in the present invention is a bulky yarn having fluff, loops, and entanglements, and has the following quality characteristics.

{1} Since the loop with its root fixed inside the yarn is raised, the fluff length is short and fluffy, and the number of fluffs is uniform in the longitudinal direction.

Due to the presence of this fluff, a soft-touch spun yarn-like woven or knitted fabric can be obtained. {2) The root (other end) of the fluff is entangled and held by the yarn core, so it does not fall out or move.

As a result, it exhibits excellent dissolving properties and process passability. '3}
Furthermore, in woven or knitted fabrics, there is no slippage, shedding, or movement of fuzz, so it exhibits excellent anti-pilling and anti-napping properties. {4) With respect to the rubbing body, most of the threads are rubbed parts or loop parts forming sheaths, that is, crimped composite filaments, and there are relatively few ordinary filaments forming the core part.

As a result, sufficient strength can be maintained. [By performing the 5' relaxation heat treatment, higher elongation can be obtained compared to bulky yarn that is not heat treated.

The ordinary polyester filament and composite polyester filament used in the present invention may be any one made of homopolyester or copolyester,
A small amount of pigment, antistatic agent, flame retardant, etc. may be contained in the polyester filament.

Further, the cross-sectional shape of the filament may be either round or irregularly shaped, or may be a mixed weave of different cross-sectional shapes.
In addition, each filament constituting the mud woven yarn consisting of ordinary polyester filaments and composite polyester filaments may be a moat weave of filaments with different recovery after drawing, that is, instantaneous recovery or delayed recovery, and if it induces a difference in yarn length, For example, any mixed weave of filaments may be used.
EXAMPLES The present invention will be specifically explained below with reference to Examples.

Here, the definitions of the entanglement strength, the method of measuring the number of fuzz, the overfeed condition, the constant length condition, and the tension condition are as follows. (Tangle strength) The winding tension is 0 without rubbing the loop yarn after fluid turbulence treatment.
．． The yield point is the lowest point in the S-S curve of the loop yarn that shows an instantaneous drop of 10% or more with respect to the tension at that position, and the stress at the yield point (g/ d) is expressed as the entanglement strength.

In other words, in Figure 2, the yield point stress is 2. S- of cone/d
It is an S curve, and the Y point in the figure is the yield point.

Two unevennesses are seen before the Y point, but this is an instantaneous drop in tension of less than 10% and is not considered a yield point according to the definition of the yield point described above. Naturally, the higher the yield point is, the more desirable it is, and the most preferable one is one in which the S-S curve is substantially smooth, but in such a case, the yield point coincides with the shear point. . The SS curve was measured using an Instron type measuring device with a sample length of 20 cm and a tensile speed of 10 cm/min, and recorded on a suitable recording paper.

At this time, the measurement was repeated three times and expressed as an average value.
In addition, the denier used to calculate the winding tension and yield stress varies depending on the degree of bulkiness of the yarn after fluid turbulence treatment. Use the indicated denier. (Number of fluff) A bulky yarn of approximately 20 skins is sandwiched between two transparent flat plates under a tension of 0.1 g nod, and the image is enlarged 17 times and projected onto a screen.

Here, those whose edges are confirmed are considered fluff, and the fluff is counted for every 10 pieces. This measurement is repeated for 100 randomly sampled fibers, and the average value is taken as the number of fuzz. (Overfeed condition, constant length condition, tension condition) When running the yarn in one processing zone, the surface speed of the yarn feeding roller is set to V. , when the surface speed of the take-out roller is V2, overfeed rate (%) = sheep bow X
- If the value obtained as oo is positive, 0, or negative, it corresponds to overfeed, constant length, and tension conditions, respectively.

Example 1 Polyethylene terephthalate having an intrinsic viscosity (polymer W) of 0.52 and 0.76 measured at 2y0 in 0-chlorophenol was composite spun side-by-side at a ratio of 50:50, and the hot pin temperature was 9500. , 75 denier 36 filament composite multifilament and polymer I with Nada water shrinkage rate of 6% drawn at a hot plate temperature of 15000
VO. 75 with a boiling water shrinkage rate of 15% by spinning polyethylene terephthalate of 65 and stretching at a hot pin temperature of 9500.
A 150 denier 72 filament tear weave yarn obtained by doubling and winding a normal multifilament having a denier of 36 filaments was used in Experiment No. 1 in Table 1 using the apparatus shown in FIG. Processing was carried out under conditions 1.

In addition, polymer IVO. 65 polyethylene terephthalate
150 obtained by spinning and stretching at a hot pin temperature of 95qo
A comparative example using a denier 72 filament drawn yarn and simply rubbing after turbulence treatment was used as Experiment No. 2 in Table 1. The fluid turbulence nozzle consists of three elements: a housing, a needle, and a venturi, and has a turbulence chamber made up of the venturi and the needle.
A nozzle similar to that shown in FIG. 4 of Japanese Patent No. 0-116745 was used.

The abrasive body used was one in which abrasive grains with an average particle size of 50 mm were exposed on the surface of a round bar with an outer diameter of 5 ribs, which was fixed at right angles to the yarn axis, and the contact angle was set to 600 mm.

The properties of the obtained bulky yarn are also listed in Table 1. Table 1 Experiment No. obtained by the method of the present invention. Experiment No. 1 is a comparative example obtained simply by turbulence treatment without relaxation heat treatment. The entanglement strength is much better than that of No. 2, and the strength and elongation of the obtained bulky yarn are also sufficiently high.

Furthermore, the fluff length was short and the number of fluffs was uniform in the longitudinal direction, resulting in a bulky and soft spun yarn-like bulky yarn. Example
2. During polymerization, polyethylene terephthalate with a polymer IV of 0.64 and a sheath made of ordinary polyethylene terephthalate with a polymer W of 0.66 were used, and the sheath:core ratio was 50: 50, the center of the sheath is eccentric by about 18% per filament radius from the center of the filament cross-sectional area.
Composite paper yarn in core shape, heat pin 95q○, heat plate 150oo
A 75 denier 36 filament composite multifilament with a boiling water shrinkage rate of 7% and a polymer IVO. 65
The polyethylene terephthalate was graded and heated to a temperature of 9.
75 denier 3 with key water shrinkage rate of 15% stretched at 5o0
A blended yarn of 150 denier and 72 filaments was obtained by electrostatically opening and overlapping 6 filaments of ordinary multifilaments.

The mixed yarn was subjected to experiment No. 1 in Table 1 using the apparatus shown in FIG. 1
Processing was carried out under the following conditions.

The obtained bulky yarn showed characteristic values of entanglement strength of 2.0 total/d, number of fluffs of 218 strands/m, strength of 29 strands, and elongation of 16.0%, and the fluff length was short. It was a bulky yarn with a uniform number of fuzz in the longitudinal direction.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a preferred process of the present invention, and FIG. 2 is an SS curve diagram for explaining the strength of loop entanglement. 1... Polyester multifilament yarn, 2... Guide, 3... Tensor, 4, 6... Lofu with Nitsu roller, 9, 11... Lofu, 5... Heating body, 7...
... Moisture imparting equipment, 8 ... Fluid turbulence nozzle, 1
0...Rubbing body, 12... Winder. Figure 1 Figure 2

Claims (1)

[Claims] 1. A mixed yarn consisting of a polyester filament and a composite polyester filament having latent crimp ability is subjected to a relaxing heat treatment to cause the composite polyester filament to develop crimp and to develop a yarn length difference between the filaments of the yarn, A special bulky yarn characterized by performing fluid turbulence treatment at a fluid pressure of 3 kg/cm^2 (G) or more to form loops or entanglements, and then forming fluff by rubbing at a friction tension of 0.05 g/d or more. manufacturing method.