JPH06200433A - Production of top-dyed yarn having high stretchability - Google Patents

Abstract

PURPOSE:To provide a process for producing a highly stretchable top-dyed yarn having crimping characteristics comparable to those of a hank-dyed yarn simply by dyeing a cheese package obtained by winding a yarn subjected to successive false-twisting, fluid-jet treatment and relaxed heat-treatment. CONSTITUTION:A thermoplastic synthetic fiber multifilament yarn is false- twisted at a twist angle of >=45 deg. and the false-twisted yarn is successively subjected to fluid-jet treatment at an over-feed ratio of >=5% and relaxed heat- treatment at an over-feed ratio of >=60%. The treated yarn is wound on a cheese package at a winding density of <=0.2g/cm<3> and then the package is dyed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing highly stretchable yarn-dyed yarn using thermoplastic synthetic fiber multifilament yarn, more specifically, false twisting, fluid injection treatment and relaxation heat treatment in a series of processes. The present invention relates to a method for producing a highly stretchable yarn-dyed yarn having a crimping characteristic equivalent to that of a dyed yarn by simply dyeing a cheese-like package that has been applied and wound up.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a highly stretchable yarn-dyed yarn used for applications requiring elasticity, a dyeing method in which a processed yarn is dyed in a drape shape is most commonly used. There is.
However, this method requires a complicated and sophisticated process such as false twisting → ply twisting → leaving → steam set → dyeing → corn winding, and a process that requires time,
There is a drawback that the processing cost is high.

Further, in order to solve the drawbacks of the dyeing method, Japanese Patent Laid-Open No. 64-52835 discloses a method of performing false twisting with the same false twisting machine followed by relaxation heat treatment at an overfeed rate of 60% or more. Fix the crimps and then 0.
A method of winding and dyeing at a winding density of 25 g / cm ³ or less,
Alternatively, after loosening heat treatment to fix the crimps, the false twist S
A method has been proposed in which twisted yarns and Z-twisted yarns are combined by air entanglement or twisted yarns, and the yarns are subjected to a process after winding and dyeing the package with cheese.

According to these methods, the cheese dyed yarn can be manufactured in a continuous series of steps. However, in the method of fixing the crimp by relaxation heat treatment after the false twisting process, the yarn is unstable unless the S twisting yarn and the Z twisting yarn having different false twisting directions are combined, and so-called "bill" occurs, There is a drawback that processing and knitting and weaving processing using the obtained processed yarn cannot be performed stably. In addition, in the method of air entanglement or twisting after fixing the crimps by relaxation heat treatment, in addition to the above-mentioned disadvantage that false twisted yarns with different false twist directions cannot be processed, it is also possible to use relaxation heat treatment. When the air entanglement is performed, the yarn becomes excessively loosened in the air entanglement nozzle, so-called a play state, because the crimps are sufficiently developed in the air entanglement. It becomes a bad processed thread. On the other hand, in the method of plying the false twisted yarn, S twist yarn and Z twist yarn, when the ply yarn is twisted at a certain tension or more, the yarn appearance is good and the handleability is good, The lower ply-twist has the drawback that the combined yarns are separated and become poor in handleability, and that twisting occurs depending on the number of twists.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the related art and simplifies the process of dyeing cheese wound with a yarn processed by a false twisting machine as it is. , A highly elastic yarn-dyed yarn of thermoplastic synthetic fiber multi-filament which has almost no difference from the yarn-dyed yarn-dyed yarn and does not need to consider the direction of false twist when splicing It is a technical subject to provide a method capable of being stably manufactured.

[0006]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that if a fluid disturbing treatment is applied before fixing the crimps of the false twist, the mixed fiber entanglement effect is obtained. Therefore, the present invention has been accomplished by finding that the directionality of the torque of the false twisted yarn is lost, and therefore even if the relaxation heat treatment is performed in the next step, the yarn can be smoothly processed without being affected by the warp.

That is, in the present invention, a thermoplastic synthetic fiber multifilament yarn is false twisted with a twist angle of 45 degrees or more, and one or more of the obtained false twisted yarns are aligned and an overfeed rate of 5 is obtained. % Fluid treatment, then relax heat treatment at an overfeed rate of 60% or more, and then roll up the cheese package at a winding density of 0.2 g / cm ³ or less to dye the cheese package. The gist is a method for producing a highly stretchable dyed yarn.

The present invention will be described in detail below.

First, in the present invention, the thermoplastic synthetic fiber multifilament yarn is subjected to false twisting, but at that time, it is necessary to process it with the number of twists so that the twist angle is 45 degrees or more. Here, the twist angle θ (degree) is expressed by the following equation.

[0010]

[Equation 1]

The above twist angle must be 45 degrees or more in order to give the yarn as much distortion as possible,
Particularly, 48 degrees or more is preferable. The upper limit of the twist angle is not particularly limited, and the higher the yarn strength, the better.

When a textured yarn obtained by false-twisting at such a high twist angle is subjected to a relaxation heat treatment in a subsequent step, a large crimping force is developed and a textured yarn having high elasticity is obtained. If the twist angle is less than 45 degrees, the strain applied to the yarn is insufficient and sufficient crimping force is not applied, so that a highly stretchable processed yarn cannot be obtained.

The temperature during the false twisting depends on the type of the thermoplastic synthetic fiber multifilament yarn to be processed, but it may be higher than the normal false twisting temperature, and the higher the temperature, the better the twist fixing property. The higher the temperature, the more preferable as long as no yarn is generated. For example, if the thermoplastic synthetic fiber multifilament yarn to be processed is polyester, 200
~ 230 ℃ is preferable, and in the case of nylon 6, 175 ~ 2
00 ° C is preferably adopted.

In the present invention, one of the false twisted yarns obtained above is supplied to the fluid treatment zone, or a plurality of false twisted yarns obtained by the adjacent weights of the false twisting machine are aligned. It is supplied to the fluid treatment zone and subjected to fluid injection treatment at an overfeed rate of 5% or more, and the directionality of the torque of the false twist textured yarn is reduced and stabilized by the mixed fiber entanglement effect.

The overfeed rate of the yarn at the time of fluid jet processing must be 5% or more, and the upper limit is 15%.
A degree is preferable. When the overfeed rate is less than 5%, especially in the case of a yarn having a fineness of 500 denier or more, the entanglement action due to the fluid injection is hardly received, and sufficient entanglement cannot be obtained. In addition, yarn separation such as double-twisted yarn occurs, resulting in a processed yarn that is difficult to handle in post processing. Air is generally used as the fluid, and the air pressure supplied to the air jet is usually 3 to 10 kg / cm ²
However, it may be adjusted as appropriate in consideration of the number of false twisted yarns supplied and the processing speed.

In the present invention, the entangled yarn obtained above is heat-treated in a certain relaxed state to fix the crimp. This heat treatment must be performed at an overfeed rate of 60% or more and within a workable range so that heat shrinkage and crimp fixing can be sufficiently performed. A point contact heater in which a guide is intermittently attached to the heater thread contact surface may be used.

60% overfeed rate during relaxation heat treatment
If it is less than the above range, heat shrinkage and crimping are not sufficiently fixed, so that even if cheese dyeing is performed in a subsequent step, the desired highly elastic yarn-dyed yarn cannot be obtained. The temperature during the relaxation heat treatment differs depending on the type of the thermoplastic synthetic fiber multifilament yarn, but is it the same as the temperature during the false twisting process?
Alternatively, the upper limit is the temperature at which the yarn starts to fuse. If the temperature during the relaxation heat treatment is too low, the heat treatment ends before the heat shrinkage of the yarn and the fixing of the crimps are not sufficiently carried out, so the crimp fastness after dyeing tends to decrease.

In the present invention, the yarn subjected to the relaxation heat treatment is wound into a cheese-like package having a winding density of 0.2 g / cm ³ or less in an overfeed state, and the cheese-like package is dyed to obtain the desired high elasticity. This is to obtain a yarn dyed. The cheese-like package should have a winding density of 0.2 g / cm ³ or less, and the yarn can be wound up, so that it does not collapse. Roll density of cheese package is 0.2g /
If it is higher than cm ³ , the yarn will be wound up in a tensioned state, so when this cheese-like package is dyed, the crimpability deteriorates and the crimp fastness deteriorates, which is unsuitable. To wind up a yarn whose crimp is fixed by relaxation heat treatment at a winding density of 0.2 g / cm ³ or less, for example, under the same or slightly lower overfeed rate as in the previous relaxation heat treatment. Wrap it into a cheese-like package without straining the yarn.

The roll density of the cheese-like package here is calculated by the following equation. Winding density A = (g / ρ) / V where g is the winding weight (g) ρ is the specific gravity of the winding fiber V is the winding capacity (cm ³ ).

As a method for dyeing a cheese-like package, a usual method can be adopted. For example, after rolling up the rolled cheese-like package in the axial direction of cheese by 20 to 60%,
It may be dyed with an Overmeier dyeing machine.

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

FIG. 1 is a schematic view showing one embodiment of a step of removing dyeing according to the present invention. In FIG. 1, first, the thermoplastic synthetic fiber multifilament yarn 1 is supplied from the package 2 through the guide 3 to the false twist zone by the supply roller 4, and is twisted by the false twist imparting device 6 while the first heater 5 is used. Heat set to form false twisted yarn. In this case, as described above, a single false twisted yarn or a plurality of false twisted yarns of adjacent weights of a false twisting machine may be aligned and supplied.

The false twisted yarn obtained above is subsequently supplied to the fluid treatment zone by the first delivery roller 7 in a state of overfeed of 5% or more, and mixed with the air injection nozzle 8 to effect the entanglement treatment. In the relaxation heat treatment zone between the second delivery roller 9 and the third delivery roller 11, the second heater performs the relaxation heat treatment at an overfeed rate of 60% or more. Subsequently, the winding zone between the third delivery roller 11 and the winding roller 12 is over fed so that the winding density is 0.2 g / cm ³
After being wound up on the cheese-like package 13, the cheese-like package is dyed.

Examples of the thermoplastic synthetic fiber multifilament yarn used in the present invention include fibers made of polyamide, polyester, polyacrylonitrile, polyolefin and the like.

The overfeed rate in the present invention is defined by the following equation. Overfeed rate of fluid treatment zone [OF (1)]

[0026]

[Equation 2]

Overfeed rate of relaxation heat treatment zone [OF (2)]

[0028]

[Equation 3]

Overfeed rate of the winding zone [OF
(3)]

[0030]

[Equation 4]

[0031]

[Working] In the present invention, a fluid injection treatment is performed before a crimp is fixed by relaxation heat treatment of a false twisted yarn obtained by false twisting a thermoplastic synthetic fiber multifilament yarn at a twist angle of 45 degrees or more. Since the yarn is applied, the yarn is not excessively loosened inside the air entanglement nozzle, that is, a so-called play state does not occur, and stable fluid ejection processing is possible.

Further, since the directionality of the torque of the false twisted yarn is reduced and stabilized due to the mixed fiber entanglement effect due to the fluid jetting process, the false twisting yarns are combined and the processes after the fluid jetting process are performed. When applied, twisting does not occur even if the twisting direction of the false twisted yarn is the same or different, and stable processing is possible even when it is desired to obtain a processed yarn of large fineness.

Further, after the fluid jet treatment, the relaxation heat treatment is followed by winding into a cheese-like package at a winding density of 0.2 g / cm ³ or less, and the cheese-like package is dyed, so that the latent crimpability of the yarn is Highly stretchable yarn-dyed thermoplastic synthetic fiber with a crimping property equivalent to that of textile dyeing yarn is efficiently produced by a series of simple steps. can do.

[0034]

EXAMPLES Next, the present invention will be specifically described by way of examples.

Example 1 230d / 48f polyethylene terephthalate highly oriented undrawn yarn (birefringence 50 × 10 ⁻³ , specific gravity 1.38) was used as the supply yarn, and the F103S type false twisting machine (manufactured by Toshiba Machine Co., Ltd.) was partially modified. According to the process shown in Fig. 1, the twisting direction Z, the twisting angle is 51 degrees, the yarn feeding speed in the false twisting zone is 65 m / min, and the take-up speed is 100 m / min.
(Drawing ratio = 1.53), and false twisting at the same time was performed at false twisting temperature of 225 ° C to obtain 150d / 48f false twisted yarn. False twisted yarn of the adjacent spindle subsequently (twisting both direction Z) aligned pull the two, air nozzles Hemajet 311TYPE (Hebarain Company for injecting compressed air at a pressure 4.5 kg / cm ² at an overfeed rate of 7% Manufactured) and subjected to fluid disturbance treatment to mix and entangle the yarns.

Then, after performing relaxation heat treatment with a heater length of 400 mm, a heater pipe diameter of 4 mm, and a heater temperature of 225 ° C. at an overfeed rate of 100%, the overfeed rate of the winding zone was set to 0.5%. , Winding density 0.12g / cm
^Three cheese-like packages were rolled up.

The obtained cheese-like package was compressed 50% in the axial direction of the cheese with a cheese press machine, put into a high temperature and high pressure cheese dyeing machine SAK-HKI type (manufactured by Sawamura Kagaku Kikai Kogyo Co., Ltd.) and dyed by a conventional method. Then, it was rewound with a cone winder.

Example 2 A twist angle in false twisting was 46 degrees, an air injection treatment zone had an overfeed rate of 5%, a relaxation heat treatment zone had an overfeed rate of 65%, and a cheese package had a winding density of 0.18 g /
The process was performed in the same manner as in Example 1 except that the size was changed to cm ³ , and dyeing and corn winding were performed by a conventional method. Table 1 shows the processing conditions of Examples 1 and 2 and the physical properties of the obtained highly stretchable yarn-dyed yarn.

Comparative Examples 1 to 6 The entangled yarn obtained by the air injection treatment in Example 1 was formed into a crepe shape without a relaxation heat treatment, and then a yarn-dyed yarn was formed by a conventional crepe dyeing method.
(Comparative Example 1)

The final cheese package has a winding density of 0.
It processed like Example 1 except rolling up to 23 g / cm < ³ >. (Comparative Example 2)

The air injection treatment zone has an overfeed rate of 7%, and the relaxation heat treatment zone has an overfeed rate of 52%.
Processing was carried out in the same manner as in Example 2 except that (Comparative Example 3)

Further, processing was performed in the same manner as in Example 2 except that the twist angle in the false twisting process was 42 degrees. (Comparative Example 4)

Next, processing was performed in the same manner as in Comparative Example 4 except that the overfeed rate in the relaxation heat treatment zone was set to 50%. (Comparative example 5)

Further, processing was carried out in the same manner as in Example 1 except that the order of performing the air injection processing and the relaxation heat treatment was reversed.
(Comparative Example 6) Table 1 shows the processing conditions of Comparative Examples 1 to 6 and the physical properties of the obtained dyed yarn.
Shown in.

[0045]

[Table 1]

The fineness, strength, and
The elongation, elongation and elongation modulus and elongation elastic modulus were measured according to JIS L-1090, synthetic fiber filament bulked yarn test method, and the unwinding property and the number of warps were judged according to the following criteria.

Unwindability: When rewinding with a cone winder, the situation of yarn breakage was evaluated according to the following three grades. ◎: Good, ○: Normal, ×: Poor

Number of times of twisting: Grasping both ends of a processed yarn having a length of 2 m, applying a load of 1/300 g per sample denier to the midpoint, and measuring the number of turns generated when suspended, per 1 m yarn length The number of turns was determined and used as the number of times of twisting (T / M).

As is clear from Table 1, the yarn-dyed yarns obtained in Examples 1 and 2 of the present invention have high stretchability and are entangled yarns produced under the same false twist and air jet treatment conditions. Even when compared with the dyed hemp dyed yarn (Comparative Example 1), it had excellent crimping properties with no browning.

On the other hand, in the case of Comparative Example 2 in which the winding density of the final cheese package is higher than the winding density specified in the present invention, there is little space between the yarns in the package even if the relaxation heat treatment is performed at a high overfeed rate. As a result, the yarn shrinkage range during cheese dyeing was small and the yarn was set as it was, so the crimping properties were also suppressed, and the desired highly stretchable yarn-dyed yarn could not be obtained.

Further, in Comparative Example 3 in which the overfeed rate of the relaxation heat treatment zone is lower than the range specified in the present invention, the overfeed rate is too small, so that the winding density of the cheese package is wound within the range specified in the present invention. However, it was not possible to obtain sufficiently high stretchable yarn-dyed yarn.

Next, in Comparative Examples 4 and 5 in which the twist angle in the false twisting process is smaller than the value specified in the present invention, the false twisting does not give the yarn sufficient strain, in other words, crimpability. As a result, a satisfactory highly stretchable yarn-dyed yarn could not be obtained even though air injection and relaxation heat treatment were applied in the subsequent process.

Further, in Comparative Example 6 in which the order of the air injection treatment and the relaxation heat treatment was reversed according to the present invention, a highly stretchable yarn-dyed yarn was obtained, but the yarn had a large number of warp and poor unwinding property. It was an article.

[0054]

According to the present invention, it is possible to produce a highly stretchable yarn-dyed yarn having a crimping characteristic similar to that of a usual yarn-dyed yarn by a series of processes, which is superior to the conventional dye-dyeing method. It is possible to improve the operability, shorten the processing time, and reduce the production cost.

Further, a plurality of false twisted yarns are aligned and subjected to a fluid injection process so that the false twisted yarns to be aligned are combined without considering the twisting direction of the false twisted yarns to be aligned, and a high denier highly stretchable yarn-dyed yarn Can be manufactured without impairing the above advantages.

[Brief description of drawings]

FIG. 1 is a schematic view showing one embodiment of a step of removing dyeing according to the present invention.

[Explanation of symbols]

 1 Thermoplastic Synthetic Fiber Multifilament Yarn 2 Package 3 Guide 4 Supply Roller 5 First Heater 6 False Twisting Device 7 First Delivery Roller 8 Air Injection Nozzle 9 Second Delivery Roller 10 Second Heater 11 Third Delivery Roller 12 Winding Roller 13 Cheese Package

Claims (1)

[Claims] 1. A thermoplastic synthetic fiber multifilament yarn is false twisted with a twist angle of 45 degrees or more, and one or more of the obtained false twisted yarns are aligned to obtain a fluid having an overfeed rate of 5% or more. A high expansion and contraction process characterized by dyeing the cheese-like package by jetting it and then subjecting it to relaxation heat treatment at an overfeed rate of 60% or more, and winding it up to a cheese-like package at a winding density of 0.2 g / cm ³ or less. A method for producing a yarn-dyed yarn.