JPS5920772B2 - Tokushiyukasadakashi Oyobi Sonoseizouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method for producing bulky yarns and chain yarns in which loops and entanglements are formed in thermoplastic multifilament yarns by fluid turbulence treatment.

Various methods have been attempted to increase the bulk of threads by creating loops and entanglements through disturbance effects in the turbulent regions of the body.

Attempts have also been made to increase the bulkiness of bulky yarns with loops and entanglements, thereby improving the bulkiness and flexibility of the final product fabric.
There is a method disclosed in Japanese Patent No. 89659.

This method is a method in which the multifilament yarn is brought into contact with a heating element under low tension, and after the heat is not uniformly transmitted to all the filaments, a fluid turbulence treatment is performed without applying substantial tension. This is a method for producing spun yarn-like filament processed yarn that exhibits great bulk through heat treatment.

The bulky yarn obtained by this method has improved bulkiness compared to a multifilament yarn simply treated with fluid turbulence.

However, in this method, the crimp and loops generated when the yarn is brought into contact with a heating body under low tension are entangled in a fluid turbulence area, and the number of loops in the obtained bulky yarn is at most 500/M. It is too small to be said to exhibit the texture and appearance of spinning, and the entanglement strength of the loops is at most 0.4 g/d or less when measured using the measurement method specified in the present invention described later. However, it has the disadvantage that it is extremely low in order to withstand the tension applied during knitting, weaving, etc. (and the bulkiness required for the final product fabric is still insufficient).

The present inventors studied the method disclosed in Japanese Patent Application Laid-Open No. 50-89659, and conducted studies with the aim of obtaining a bulky yarn with even further improved loop entanglement strength and bulkiness after heat treatment. invention has been achieved.

That is, the first aspect of the present invention is a thermoplastic multifilament yarn in which loops and entanglements are generated by fluid turbulence, and the thermal shrinkage rate in the longitudinal direction of the same filaments constituting the chain yarn and the same length of the chain yarn. - The heat shrinkage coefficients between the filaments in the cross section are non-uniform, and the heat shrinkage coefficients exhibit a distribution having at least two peaks;
Bulk height after heat treatment in air at ±2°C for 5 minutes with no load
/ The bulk height increases by 9 or more, and the loop entanglement strength is 0.
It is a special bulky yarn with a ratio of 1/a or more.

[However, for the loop entanglement strength, the lowest point on the S-8 curve that shows an instantaneous drop in tension of 10% or more with respect to the tension at that position is the yield point; the stress at the yield point (, 9 /
This is expressed in a).

] The bulky yarn of the present invention has non-uniform heat shrinkage rates in the longitudinal direction of the same filaments constituting the chain yarn and uneven heat shrinkage rates between the filaments in the same cross section of the chain yarn, and the following: The heat shrinkage rate obtained according to the specified measurement method shows a distribution having at least two peaks.

In other words, if viewed macroscopically, it is a yarn that has at least two types of heat shrinkage rates, and if viewed microscopically, there is a difference in heat shrinkage along the individual filaments, and a yarn with a small heat shrinkage rate (both have two peaks). It is a thread that exhibits a distribution of

By doing this, compared to a yarn that simply uses the difference in heat shrinkage of one type of multifilament yarn, greater bulkiness can be developed by heat treatment because the difference in heat shrinkage of multiple Yaruchi filament yarns is used. , the bulkiness value specified below increases by at least 5 cc/9 or more and exhibits a value of 19 cc/9 or more by heat treatment in air at 200°C ± 2°C with no load for 5 minutes. It is.

The bulkiness of the bulky yarn of the present invention before heat treatment is 15cc79
The following is preferable.

In other words, in order to make the bulk height higher than 15Ce/P, it is necessary to form many large loops, and bulky yarns with many large loops tend to have poor unwinding properties from the package and are difficult to manufacture. This is because they have the disadvantage of being easily caught in guides during the knitting and weaving processes.

Those whose bulk level after heat treatment is less than 19Ce/9, and those whose bulk level increase due to heat treatment is less than 5cc/9,
The effect as a bulky yarn, which is the objective of the present invention, cannot be achieved.

Furthermore, the bulky line according to the present invention has a form in which minute loops are present on the surface of the filament bundle parallel to the longitudinal direction of the comparative fishing line, in which the filaments are intertwined with each other.

These loops and entanglements are generated by applying fluid turbulence processing, and the value of the entanglement strength of the loop specified below is 0.1/a or more, and 1.0, 9/a or more. preferable.

If the entanglement strength is 0.89/a or more, the maximum tension applied during the unwinding, weaving, and knitting processes from the package (
(approximately 1 g/d), so there is little or no unraveling of entanglements, which poses no practical problem.

The bulky yarn of the present invention has loops and entanglements generated in a fluid turbulence region, and the number of loops present on the surface of the bulky yarn is at least 2000 in order to sufficiently exhibit the appearance and texture of a spun yarn. It is preferable that there is more than ko/M,
More preferably, it is 3000 co/M or more.

The second invention of the present invention is a preferable manufacturing method for obtaining the bulky yarn according to the first invention, in which at least two types of thermoplastic multifilament yarns having different drainage shrinkage rates of 3% or more are mixed into each multifilament yarn. For each filament, set the overfeed rate to 4 to 15 (drainage shrinkage rate of yarn feeding) and contact the heating element under low tension, so that the heat from the heating element is not uniformly transmitted to all filaments without generating loops. After running in contact, at least one type of multifilament is added with moisture, and then supplied to a fluid turbulence region under the same or different oversupply conditions, thereby forming loops or entanglements in the fluid turbulence region, and then winding the multifilament. be.

Further, the third invention of the present invention is another preferable manufacturing method for obtaining the bulky yarn according to the first invention, wherein at least two types of thermoplastic multifilament yarns having different drainage shrinkage rates of 3% or more are used. , set the overfeed rate to 4 to 15 inches and %B to (%B+8), where B is the amount of submerged shrinkage of the low shrinkage yarn in the supply system). After running the filament in contact so that the heat from the heating element is not uniformly transmitted to all the filaments, water is added and then supplied to the fluid turbulence area under oversupply conditions to generate loops and entanglements in the fluid turbulence area and wind it. This is the way to take it.

In the present invention, it is necessary to use at least two types of thermoplastic multifilament yarns whose drainage shrinkage ratios differ by a factor of 3 or more, and it is more preferable to use yarns whose drainage shrinkage ratios differ by a factor of 5 or more.

In other words, when using three or more types of multifilament yarn, the difference between the highest and lowest drainage shrinkage is 3.
It is necessary to have at least one person in charge.

If the difference in submergence shrinkage rate of the thermoplastic multifilament yarn used is less than 3%, the bulkiness of the obtained yarn after heat treatment will decrease, and the effects of the present invention cannot be exhibited.

The thermoplastic multifilament yarn that can be used in the present invention is made of a thermoplastic polymer such as a homopolymer or a copolymer such as polyamide, polyester, polyacrylic, or polyolefin. A combination is also possible.

In any combination, the lowest drainage shrinkage rate is 3.
It is preferable to set it to 5% or more, preferably 5% or more, since this improves the contact running properties on the heating body and increases the bulkiness of the bulky yarn after heat treatment.

Furthermore, known modifiers such as pigments, antistatic agents, flame retardants, and dye-seating components may be added to the multifilament yarn within a range that does not impede the effects of the present invention.

The cross-sectional shape of the filament may be a round cross-section, an irregular cross-section, or a mixture of the two, and the filament denier is preferably 3.2 d or less because a fine denier and a large number of filaments improve the loop entanglement strength. ,2
．． It is particularly preferably 1 d or less, and may be a denier mixed yarn.

Further, the total number of filaments is preferably 20 or more, and 24
It is particularly preferable that the number is more than 100 yen.

The ratio of the high shrinkage component filaments to the total number of filaments is preferably 35 to 65.

The method for manufacturing bulky yarn according to the present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic diagram showing a preferred process of the second invention of the present invention, in which a multifilament yarn 10 is supplied to a roller 13 via a tensor 12 that suppresses fluctuations in unwinding tension, and then the roller 13 and the roller Heating pin 14 under overfeed conditions between 15 and low tension of 5 to 60 m9/d.
The filament is brought into contact with the filament and run so that the heat from the heating pin is not uniformly transmitted to all the filaments without creating a loop.

On the other hand, after the multifilament yarn 11 having a drainage shrinkage rate different from the multifilament yarn 10 by 3φ or more is supplied to the roller 19 via the tensor 18 in the same manner as described above, the multifilament yarn 11 is fed between the roller 19 and the roller 21 under overfeed conditions.
It is made to run in contact with the heating pin 20 under a low tension state of 5" to 60 m9/d.

The yarns exiting rollers 15 and 21 are moistened with moisture applicators 16 and 22, respectively, between rollers 23, and subjected to fluid treatment by fluid turbulence nozzle 17 under overfeed conditions to form multifilament yarns 10 and 11. After creating loops and entanglements while mixing them together, they are wound up with a winder 24.

The temperatures of the heating pins 14 and 20 need to be above the secondary transition point and below the melting point of the respective supply systems;
More preferably, the temperature is higher than the temperature at which the thermal contraction force of the supply system is maximum.

Further, the temperature of the double-jaw heating pins may be the same or different, and can be set depending on the melting point and running stability of the thread.

When running in contact with the heating pin under low tension, the overfeed rate of both supply systems is 4 to 15% (where A is the amount of submerged shrinkage of each supply system.

) If the overfeed rate is less than 4 coefficients or less than %A%, the effect of providing random size and cycle differences, heat shrinkage differences, and yarn length differences along individual filaments will be insufficient, and the resulting bulkiness will be insufficient. The bulk level of the yarn, especially after heat treatment, decreases.

When the overfeed rate is greater than 15%, the occurrence of field loops is observed, which increases the non-uniformity of heat transmitted to individual filaments, increases the difference in thermal shrinkage, and increases the potential for shrinkage. , the runnability of the light removal by running in contact with the heating pin deteriorates, and thread breakage occurs frequently, so it is therefore necessary to reduce the amount to 15% (%A+8)% or less.

The overfeed rates of both supply systems when performing fluid turbulence processing may be the same or different, but when they are the same, the overfeed rates are (20-X) to (60-X)%.
(However, X is the larger overfeed rate when running in contact with the heating pin.

) When different overfeed rates are used, one overfeed rate is set to 5 to 25 in order to improve the bulkiness of the obtained bulky yarn and the entanglement strength of the loops.
It is preferable that the other overfeed rate is 20% or more and 10 coefficient μ higher than the one value, and in this case, a bulky yarn with a loop entanglement strength of 1.2.9/d or more can be obtained.

FIG. 2 is a schematic diagram showing a preferred process of the third aspect of the present invention.

Multifilament yarn 25 with different drainage shrinkage ratios of 3 or more factors
and 26 are fed to the roller 28 via the tensor 27.

Note that if two types of multifilament yarns having different drainage shrinkage rates by 3% or more have already been mixed or aligned, the mixed multifilament yarns may be fed as they are.

Reference numeral 29 is a heating pin, and the thread is passed between rollers 28 and 30 under overfeed conditions and under a low tension of 5 to 60 mg/d, so that the heat from the heating pin is uniformly transmitted to all filaments without generating loops. Run in such a way that there is no contact.

Next, moisture is applied between the rollers 30 and 33 by a moisture applying device 31, and fluid treatment is performed by a fluid turbulence nozzle 32 under overfeed conditions to generate loops and entanglements, and then wound up by a winder 34.

The temperature of the heating pin 29 needs to be above the secondary transition point and below the melting point of the highly shrinkable yarn, but is more preferably above the temperature at which the thermal shrinkage stress of the high shrinkage yarn is maximum.

When running in contact with the heating pin under low tension, the roller 28
and 30, an overfeed rate of 4 is required.

(However, B is the drainage shrinkage percentage of the low shrinkage yarn in the supply system).

When the overfeed rate is 4, the bulkiness of the high yarn, especially after heat treatment, decreases.

In addition, when the overfeed rate exceeds 15 coefficients, raw material becomes visible, the non-uniformity of heat transmitted to each filament increases, the difference in thermal shrinkage becomes large, and the potential shrinkage ability increases. , The runnability of the thread deteriorates when running in contact with the heating pin, and thread breakage occurs frequently.

The overfeed rate between rollers 30 and 33 when performing fluid treatment is (2Q-X') ~ (60-X')
% (where X' is the overfeed rate when running in contact with the heating pin).

In addition, in FIGS. 1 and 2, if moisture is added to the yarn using the moisture applicator 16, 22 and 31 before treatment with the fluid turbulence nozzle, the effect of the fluid turbulence treatment will be improved and the strength of the loop entanglement will be increased. This is necessary because the uniformity of loops and entanglements in the length direction improves as the flow rate increases. However, when supplying fluid to a turbulent region under different oversupply conditions as shown in Figure 1, at least one type of multi-layer All you have to do is add moisture to the filament.

As a fluid turbulence nozzle, Japanese Patent Publication No. 38-2828,
JP-A-50-116745 or U.S. Patent No. 3
A so-called "Pataslan" nozzle as shown in the specification of No. 545057 is preferred (G).

When creating loops or entanglements in the yarn using the "Taslan" nozzle, the yarn cannot be processed as it will wrap around the roller that is being fed to the nozzle unless there is substantial tension between the roller that feeds the nozzle and the nozzle.

In order to prevent the yarn from being wrapped around the roller that supplies the nozzle and improve operability, the tension should be 20 μ/d or more, preferably 3
It is preferable to set it to 0 da/d or more.

In addition, in order to give a good spun yarn-like texture and appearance and to increase the strength of loop entanglement, the pressure of the fluid supplied to the fluid turbulence nozzle is preferably 3.0 kg/CaG1 or more,
3.5kg/ = (a or more and (fluid pressure (Kg/c)
It is further preferred that (Gl)/(square root of yarn feeding speed (m/m1n) to the fluid turbulence nozzle) is above 0.23 LlG).

FIGS. 1 and 2 show preferred examples of the second and third aspects of the present invention, but are not limited thereto. 19.28
The yarn treated with the heating pin is once wound up and then treated with a fluid turbulence nozzle. Also, when the yarn is run in contact with the low-tension crab heating pin, the yarn speed on the input side and exit side of the heating pin is controlled at the same speed. It is also possible to adopt means such as determining it by the circumferential speed of the stepped roller.

The bulky yarn obtained by the present invention has non-uniform heat shrinkage coefficients in the longitudinal direction of the same filament and between each filament in the same cross section, and when the heat shrinkage coefficients of all constituent filaments are expressed as a frequency distribution. It exhibits a distribution with at least two peaks and is strongly entangled due to fluid turbulence, so compared to conventional yarns, it has both superior bulk and entangling properties, making it an excellent yarn for knitted fabrics. be.

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

Tangle strength, bulk height (after heat treatment, without heat treatment)
The methods for measuring the distribution of , overfeed rate, submergence shrinkage rate, and heat shrinkage rate of bulky yarn are as follows.

(Loop entanglement strength) In the S-8 curve of the sample, the lowest point that shows an instantaneous drop in tension of 10% or more with respect to the tension at that position is defined as the yield point, and the stress at the yield point (9/ d) is expressed as the entanglement strength.

That is, FIG. 3 shows the S-8 curve for a case where the stress at the yield point is 1.75.9/d, and the Y point in the figure is the yield point.

Two unevennesses are seen before the Y point, but these represent an instantaneous drop in tension of less than a factor of 10, and are not considered to be a yield point according to the definition of the yield point described above.

Naturally, the higher the yield point, the more desirable it is.
Most preferably, the S-8 curve is substantially smooth, in which case the yield point coincides with the breaking point.

The S-8 curve was measured using an Instron-type measuring device with a sample length of 20 cIrL and a tensile rate of 10 crn/min, and recorded on a suitable recording paper.

At this time, the measurement was repeated three times and expressed as an average value.

Further, the denier used to calculate the yield stress is the indicated denier of the yarn immediately before entering the bulking fluid nozzle, since the yarn after bulking has bulkiness and its value varies depending on the degree of bulkiness.

(Bulk height after heat treatment) FIG. 4 shows a sketch of the bulk height measuring device, and FIG. 5 shows a sketch for explaining the measurement method using the measuring device.

Two notches 6 are provided on the top surface of the sample stage 1, the distance 7 between the outer edges thereof is 6 mrn, and the notches 6 have a width of 2.
5crf1. A flexible thin cloth tape 2 is passed over the lower end thereof, and a metal fitting 3 with a pointer and a load 4 are connected thereto.

The pointer on the metal fitting 3 is set so as to indicate the 0 position on the scale 5 when no sample is mounted.

Each skein of the sample is wound 80 times using a skein machine with a circumference of 1 m, and 2 to 10 skeins are prepared depending on the indicated fineness, and these skeins are individually placed in air at 200 ± 2°C without any load for 5 minutes. After the heat treatment, the skein is hung so that the indicated fineness is 48,000 denier (for example, 30 denier).
If it is a denier thread, it is 30X80X224,800
．． 48,000÷4.800=10, 10 skeins, 75 denier yarn, 75X80X2=12,000,
48,000 ÷ 12,000 = 4 (4 skeins)) Arrange them in parallel.

Next, this aligned skein is folded into four as shown in FIG. 5A to form a sample 8, and as shown in the front view of FIG. 5B and the cross-sectional view of FIG. Insert it between it and table 1.

Load 4 should be 5M in total with the metal fitting with a pointer, and read the value indicated by the pointer.

The measurement sample 8 is measured three times in total by moving the position, and the average value L (ci) is determined.

The bulk height M is calculated from the following formula.

Here, D is the fineness (denier) of the sample yarn before heat treatment, P
is the number of parallel threads in the tape.

In addition, SH is the shrinkage rate during dry heat treatment, and the cold used for bulkiness measurement is 4′Irll1/
This is a value obtained by measuring with a load corresponding to d and expressed as a percentage.

(Bulk height without heat treatment) In the bulk height measurement method after heat treatment, the same operations and calculations are performed except that the heat treatment operation at 200° C. is omitted and 5H=O in the calculation formula.

(Overfeed rate) When the yarn is run in an oversupplied state, the surface speed of the yarn feeding roller is set to V2, and the surface speed of the take-out roller is set to V2, and it is calculated from the following formula.

(Diving Shrinkage Rate) Let Ll be the original length when a load of 2Dg (D is the yarn denier) is applied to a skein of 10 turns of sample raw yarn, each 1 m long.

Next, when the length when a load of 2Dg is applied after processing for 15 minutes in an unloaded drainage system is L2, it is expressed by the following equation.

(Heat shrinkage rate distribution of bulky yarn) Cut the sample bulky yarn into approximately 5 CrrL at five arbitrary locations, separate all of them into filaments while applying as little tension as possible, and divide the sample bulky yarn into filaments that are 5 times the number of filaments of the sample bulky yarn. Prepare filament.

For all of these filaments, one end was fixed with a pin clip and the other end was fixed with a load of 0.1 g/d.
Pin clip and 0 by cassette meter under load of d
．． Read the length L3 of the filament during 1 g/d load.

In this case, L3 is set to 4.0 to 4.5 CrrL. Next, the distance between the pin clip and a load of 0.1 g/d was adjusted with boiling water for 15 minutes so that the filament could be sufficiently contracted by submersion treatment, and the pin clip was removed using a cassette meter under a load of 0.1 g/d. and 0.1
Read the filament length L4 between g/d loads.

The submergence shrinkage rate of the filament is calculated from the following formula.

A frequency distribution diagram of the submersion shrinkage rate (indicated by the frequency of the submersion shrinkage rate per thread) of all of the obtained filaments is created, and this is taken as the heat shrinkage rate distribution of the sample bulky yarn.

Example 1 Polyethylene terephthalate filament systems of 75D-36F with different submerged shrinkage rates obtained by changing the drawing speed and drawing hot plate temperature were subjected to the following procedures using the equipment shown in Fig. 2 with the combinations shown in Table 1. Processing was carried out under the following conditions.

The fluid turbulence nozzle shown in FIG. 4 of U.S. Pat. No. 3,545,057 is used, and the tension between the roller 30 and the nozzle 32 is SO=g/d.
Met.

Table 1 shows the bulkiness of the obtained bulky yarn (before and after heat treatment)
It was shown to.

Experiments 44, 5, and 6 in Table 1 are all comparative examples for clarifying the effects of the present invention.

This shows that if the difference in submerged shrinkage rate between the two types of polyethylene terephthalate filaments used is less than 3%, a yarn having the bulkiness targeted by the present invention cannot be obtained.

To make this more clear, experimental layer 2, experimental layer 5
, Thermal shrinkage rate (
Figure 6 shows a distribution map of the diving contraction rate.

In FIG. 6, B is the heat shrinkage rate distribution of the bulky yarn of Experiment 165, and C is the heat shrinkage rate distribution of the bulky yarn of Experiment 46, both of which have a single peak heat shrinkage rate distribution.

On the other hand, the distribution of the submersion shrinkage rate of the bulky yarn of experimental layer 2 obtained by the method of the present invention using yarns with submergence shrinkage rates of 7% and 15% is shown by A, and has two peaks. It has a distribution of heat shrinkage rate, and therefore exhibits excellent bulkiness.

Example 2 A polyethylene terephthalate polymer (melting point: 260°C) produced according to a conventional method and a copolymer (melting point: 238°C) obtained by copolymerizing isophthalic acid in an amount of 10 moles per terephthalic acid during polymerization were used. , Special public official 1977-15
A mixed fiber undrawn yarn containing 24 fibers of each component yarn was spun using a conventional composite spinning apparatus shown in Japanese Patent No. 815, and then drawn to obtain a mixed fiber drawn yarn of 150D-48F.

Separately, as a result of making drawn yarns from the homopolymer and copolymer individually under the same spinning and drawing conditions, the submerged shrinkage rate of the drawn yarn made of the homopolymer and the drawn yarn made of the copolymer was 8%, respectively.
, was in charge of 15.

The mixed fiber drawn yarn of 150D-48F was designated as 26 in Fig. 2 and processed under the same conditions as in Example 1 without using the raw yarn of 25. The height of the bulky yarn before heat treatment was 12.5 c.
c/g, the bulkiness after heat treatment was 23.8 CC/g, and the loop entanglement strength was 0.93 g/d.

Example 3 Polyethylene terephthalate filament yarns of 75D-36F' having submergence shrinkage rates of 7% and 15% were processed using the apparatus shown in FIG. 1 with the combinations shown in Table 2.

Yarn 10 has a diving shrinkage rate of 7%, yarn 11 has a diving shrinkage rate of 15%.
belongs to.

The overfeed rate between rollers 13 and 15 is 8%,
10% overfeed rate between rollers 19 and 21
, the temperature of the heating pin 14.20 was 220°C, the same fluid turbulence nozzle as in Example 1 was used;8. OK9/c
m', compressed air of 13 Nm'/6r was fed.

Also, from the water application device 16.22, 5 CC, /
71117i of moisture was added, the circumferential speed of the roller 23 was set to 320 m/mi, and the winding tension was set to 20 g.

Circumferential speed of rollers 13, 15, 19, 21, roller 1
The bulk height before heat treatment of the bulky yarn that obtained each overfeed rate between 5 and 23 and between 21 and 23, the bulk height after heat treatment,
Table 2 shows the strength of the loops.

Example 4 75D-36F polyethylene terephthalate filament yarn with a diving shrinkage rate of 9 and 70D with a diving shrinkage rate of 15%.
=34F nylon-6 filament yarn was processed using the apparatus shown in FIG.

That is, nylon-6 filament yarn is used as the raw yarn 10,
Processing was carried out under the same conditions as in Experiment 169 of Example 3, except that polyethylene terephthalate filament yarn was used as the raw yarn 11 and the temperature of the heating pin 14 was 180°C.

The bulkiness of the obtained bulky yarn before heat treatment is 12.8CC/g
The bulk height after heat treatment was 21.5 cc and 7 g, and the loop entanglement strength was 0.90 g/d.

[Brief explanation of drawings]

Figures 1 and 2 are process schematic diagrams showing preferred embodiments of the present invention, and Figure 3 is an S
-8 curve diagram, Figure 4 is a schematic diagram of the bulkiness measuring device, Figure 5 is a schematic diagram for explaining the method of measuring the bulkiness, and Figure 6 is a diagram explaining the distribution of the thermal shrinkage rate of bulky yarn. This is a graph for 10.11, 25, 26: Thermoplastic multifilament, 13, 15, 19, 21. 23, 28° 30.33:
Roller, 14, 20, 29 Two heating pins, 16, 22,
31: Moisture adding device, 17° 32: Fluid turbulence nozzle, 2
4,34: Winder.

Claims (1)

[Claims] 1. A thermoplastic multifilament yarn in which loops and entanglements are generated by fluid turbulence, the thermal shrinkage rate in the longitudinal direction of the same filaments constituting the chain yarn and within the same cross section of the chain yarn. The heat shrinkage coefficients between each filament are non-uniform, and the heat shrinkage coefficients exhibit a distribution having at least two peaks, and the heat shrinkage coefficients are unloaded for 5 minutes in air at 200°C ± 2°C. Bulk height after heat treatment is 19CC/9
With the above heat treatment, the bulk height increases by 5cc/9 or more,
The loop entanglement strength is 0.8! A special bulky yarn with a yarn thickness of 9/d or more. [However, in the loop entanglement strength S-8 curve, the lowest point that shows an instantaneous drop in tension of 10 or more with respect to the tension at that position is defined as the yield point, and the stress at the yield point (g/d
). [2] At least two types of thermoplastic multifilament yarns with different water conduction shrinkage rates by 3 or more are prepared with an overfeed rate of 4 to 15 inches for each multifilament and %A to (
3AA + 8)% binding (A is the amount of submerged shrinkage wheels in each supply system) Contact with the heating element under low tension to prevent the heat from the heating element from being uniformly transmitted to all filaments without creating a loop. After running in contact, at least one type of multifilament is moistened, and then supplied to a fluid turbulence region under the same or different excess supply conditions, and loops or entanglements are generated in the fluid turbulence region, and the multifilament is wound up. A method for manufacturing special bulky yarn. 3 At least two types of thermoplastic multifilament yarns with different water conduction shrinkage rates of 3% or more are combined with an overfeed rate of 4.
~15 inches and %B - (%B + 8) (where B is the amount of submerged shrinkage wheel of the low shrinkage yarn in the supply system) At the same time, contact the heating element under low tension and heat the yarn without creating a loop. After running the filament in contact so that the heat from the body is not uniformly transmitted to all the filaments, moisture is added to the filament, and then it is supplied to the fluid turbulence area under oversupply conditions to generate loops and entanglements in the fluid turbulence area, and then wound. A method for producing a special bulky yarn characterized by: