JPH1121741A - Production of polyester textile fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester textile fabric excellent in touch by weaving specific conjugate yarns followed by moist heat treatment of the resulting woven fabric in a relaxed state to develop crimps therein to afford it with high resilience with a relatively small amount of yarns. SOLUTION: First, a textile fabric is woven using conjugate yarns, false-twist textured yarns, composed of at least two kinds of filament yarns, namely, polyester filament yarns A -5 to 10% in boiling water shrinkage and 25-50% in degree of crystallinity and another kind of polyester filament yarns 15-40% in boiling water shrinkage and 2-15% in degree of crystallinity. Subsequently, the woven fabric is subjected to moist heat treatment in a relaxed state at 60-135 deg.C in the scouring process to develop crimps therein, thus obtaining the objective polyester woven textile fabric.

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 a polyester woven fabric, and more particularly to a method for producing a polyester woven fabric capable of obtaining resilience with a relatively small amount of yarn.

[0002]

2. Description of the Related Art Conventionally, as a polyester composite processed yarn in which two or more yarns are mixed, two yarns having a difference in elongation are aligned and false-twisted, or a difference in feed rate is obtained. It is known that two yarns provided with are subjected to false twist processing to form a core-sheath structure.

[0003] However, conventional polyester composite yarns all have high shrinkage and bulkiness, so that when formed into a woven fabric, the yarn is hard and lacks resilience, and tends to have a large feeling of fluttering. . In addition, since the shrinkage is high, the shrinkage area in the dyeing process becomes large, and the amount of yarn required for a desired woven fabric area becomes relatively large, resulting in an increase in cost.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a polyester woven fabric which can provide a woven fabric having high resilience with a relatively small amount of yarn.

[0005]

According to the present invention, there is provided a method for producing a polyester fabric, comprising: a polyester yarn A having a boiling water shrinkage of -5 to 10% and a crystallinity of 25 to 50%; A woven fabric is woven using a composite yarn in which at least two kinds of yarns are mixed with a polyester yarn B having a boiling water shrinkage of 15 to 40% and a crystallinity of 2 to 15%. It is characterized in that a fabric crimp is developed by performing a wet heat treatment in a relaxed state.

[0006] At least two of the composite yarns
Since the boiling water shrinkage of the yarn B among the polyester yarns A and B is 15 to 40%, the woven fabric after the wet heat treatment forms a deep woven crimp due to shrinkage. Moreover, since the crystallinity of the yarn B is as low as 2 to 15%, the yarn B slightly shrinks when subjected to wet heat treatment, and the internal structure becomes loose and the Young's modulus decreases, so that high resilience can be imparted. . The high resilience as used herein means having high bending recovery and moderate bending resistance.

Further, since the two types of polyester yarns A and B have a difference in shrinkage, the yarn A on the low shrinkage side floats on the surface of the woven fabric, and a soft touch with a surface touch can be obtained. Further, although the fabric crimp is formed by the wet heat treatment, the shrinkage is low, so that the area shrinkage in the dyeing step or the like is suppressed to be small, and the above-described high resilience can be obtained with a relatively small amount of yarn.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the polyester of the polyester yarn constituting the composite yarn is not particularly limited as long as it has a fiber-forming property. For example, polyethylene terephthalate, polybutylene terephthalate and the like can be mentioned as typical examples, and among these, polyethylene terephthalate is particularly optimal.

Polyethylene terephthalate includes, as copolymerization components, for example, dibasic acids such as adipic acid, sebacic acid, isophthalic acid, diphenyldicarboxylic acid, and naphthalene dicarboxylic acid; oxyacids such as oxybenzoic acid; and diethylene glycol, propylene glycol, and polyethylene glycol. And one or more kinds of glycols such as 5-sodium sulfoisophthalic acid. These polyesters may be added with a small amount of a matting agent such as titanium oxide, a fine pore forming agent such as kaolinite, an antistatic agent and the like.

The cross-sectional shape of the filament constituting the composite yarn of the present invention may be a round cross section, a multi-lobal cross section, a flat cross section, a hollow cross section,
Any other specially shaped cross section is applicable, and any combination may be used.

As a combination of at least two kinds of yarns constituting the composite yarn, at least one of the polyester yarns A
Has a boiling water shrinkage of -5 to 10% and a crystallinity of 25 to 5
0%, and the other polyester yarn B needs to have a boiling water shrinkage of 15 to 40% and a crystallinity of 2 to 15%. In addition, combinations such as types, forms, shapes, and physical properties may be the same or different from each other.

The boiling shrinkage of the polyester yarn B is 15%.
If it is smaller, it is difficult to develop a deep fabric crimp. Conversely, if it is larger than 40%, it is difficult to achieve the object of obtaining a highly resilient woven fabric with a small amount of yarn, which is not preferable.

The crystallinity of the polyester yarn B must be 15% or less, and the crystallinity must be low such that the internal structure has many amorphous structures. When the crystallinity is higher than 15%, it is difficult to lower the Young's modulus during the wet heat treatment, and thus it is difficult to impart the high resilience aimed at by the present invention. On the other hand, if the crystallinity is smaller than 2%, the shrinkage becomes large, so that a large amount of yarn is required to produce a cloth of the same area, which is not preferable.

The other polyester yarn A has a boiling water shrinkage smaller than that of the yarn B and not more than 10%. By setting the upper limit to 10%, the difference in shrinkage from the polyester yarn B can be sufficiently ensured, so that the surface touch of the woven fabric can be made soft and swelling.

The lower limit of the boiling water shrinkage of the polyester yarn A may be negative. That is, it may exhibit spontaneous elongation. However, even if the spontaneous elongation is too large, the difference in shrinkage from the yarn B becomes too large, the floating of the sheath yarn becomes large, and the appearance of the fabric deteriorates. Therefore, the lower limit is set to -5%.

The crystallinity of the polyester yarn A is larger than that of the yarn B. However, if the crystallinity of the yarn A is too large, the hand becomes hard, which is not preferable.
Therefore, the upper limit of the crystallinity is set to 50%. Further, the lower limit of the crystallinity must be up to 25% because it is necessary to suppress the shrinkage in order to develop a yarn length difference.

In the method for producing a polyester fabric of the present invention, a composite yarn having the above-described characteristics is formed into a woven fabric, and the woven fabric is subjected to a wet heat treatment in a relaxed state. Here, the relaxed state refers to, for example, a state in which both the warp and the weft contract with respect to the greige machine during the scouring. By the wet heat treatment, the above-described composite yarn shrinks to exhibit a deep woven crimp. Moreover,
Since the internal structure of the yarn B is low in crystallinity and has many amorphous structures, the internal structure of the yarn B is loosened and softened by the wet heat treatment. By this softening, high resilience can be imparted to the woven fabric exhibiting a deep woven crimp.

In order to further improve the high resilience effect, as the single yarn fineness of the polyester yarns A and B, the yarn B having a large boiling water shrinkage ratio is larger than the yarn A having a small boiling water shrinkage ratio. It is preferable to increase the size, for example, 3 to 10 d
Should be within the range. Thus, the yarn B on the high shrinkage component side
By increasing the single-filament fineness of the woven fabric to a large fineness, the yarn A has a low crystal structure and a low Young's modulus during wet heat treatment. Can be more easily obtained.

Polyester yarns A and B by wet heat treatment
Since the difference in shrinkage causes a difference in shrinkage, the composite yarn has a core-sheath structure, and the yarn A on the low shrinkage side floats on the surface, so that the surface touch has a soft touch. In addition, a deep textile crimp is formed by the wet heat treatment, but since the composite yarn has low shrinkage, the area shrinkage in the dyeing process is small, and excellent high resilience can be obtained with a relatively small amount of yarn. .

In the present invention, the wet heat treatment applied to the fabric is preferably performed as a scouring step. The scouring step may be a conventionally known step performed before the conventional polyester textile dyeing step. The temperature of the wet heat treatment is preferably 60 to 135 ° C. In the scouring step, softers, open soapers, jet dyeing machines, boil-offs, purable ranges, L boxes, J boxes and the like are preferably used. Among them, a liquid jet dyeing machine is preferably used because the process tension is low. As the scouring agent to be added to the liquid bath in the scouring step, a conventionally used scouring agent is applied, and it may be appropriately selected according to the properties of the fabric and the glue.

In the present invention, as the composite yarn used for weaving a woven fabric, a composite false twisted yarn is most preferably used. As the composite false twisted yarn, it is preferable to combine a polyester yarn heated to a high temperature and a polyester yarn at a low temperature in a draw false twisting system to perform false twisting.

When the high-temperature polyester yarn and the low-temperature polyester yarn are joined in a false-twisting system and false-twisted, a difference between the high-temperature yarn and the low-temperature yarn during the false-twisting is obtained. The heat is transferred in the, and the high-temperature side yarn heats the low-temperature side yarn unevenly in the yarn axis direction and diametric direction, causing a change in the internal structure and fiber shape within and between the single yarns I do.
When this heat treatment is performed for free, this change causes a non-uniform and short-period thick and thin structure in the yarn axis direction of the single fiber, and a plurality of streaky indentations in the diameter direction of the single fiber. A crimp in a slow wave shape that does not resemble the twisted yarn is obtained. Further, since the cross-sectional deformation is small, the glitter peculiar to false twisted yarn is also improved.

In the above false twisting, one polyester yarn B has a boiling water shrinkage of 15 to 40% and a crystallinity of 2%.
ポ リ エ ス テ ル 15%, and the other polyester yarn A must be treated so that the boiling water shrinkage is -5-10% and the crystallinity is 25-50%. One of the processing methods that makes this possible is that the high-temperature side yarn A is heated to 80 to 180 ° C., while the low-temperature side yarn B is in a non-heated (normal temperature) state and subjected to false twisting. The false twisted yarn obtained under these conditions is 100 to 3
Twisting at 000 times / m is performed, and the twisting is preferably performed by dry heat or wet heat for about 10 minutes to 24 hours. The heating temperature at the time of this twist setting is 50 in case of dry heat.
To 70 ° C, and 30 to 60 ° C in the case of wet heat.

Another method of setting the boiling water shrinkage and the crystallinity is to set the heating temperature of the yarn A to a relatively high temperature of 140 to 215 ° C., while setting the yarn B to a non-heated (normal temperature) state. False twisting. In this case, the boiling water shrinkage and the crystallinity can be obtained only by false twisting. In addition, additional twisting and twisting set are performed as necessary, so that the boiling water shrinkage and the crystallinity are within the above ranges.

In the above two methods, any one of the portions overlapping at the high temperature side of the false twisting step may be adopted depending on the mixing ratio between the yarn A and the yarn B.
For example, when the mixing ratio of the yarn A is higher than that of the yarn B, the former twisting and twisting set is adopted in the temperature overlapping region, and when the mixing ratio is small, the latter twisting is performed. The method which does not perform twisting set is adopted.

As the false twisting means used for false twisting, any conventionally known means can be used, for example, a circumscribed friction false twisting apparatus, a belt nip type false twisting apparatus, a spindle type false twisting apparatus, and the like. Can be used, and may be appropriately selected according to the type of the supply yarn, the false twisting conditions, and the like. FIG. 1 shows an example of a composite false twisting process used for processing the above-described composite yarn.

In FIG. 1, two types of packages, a package 1a around which a polyester yarn A is wound and a package 1b around which a polyester yarn B is wound, are provided on the supply side. A merging guide 5, a cooling plate 6, and a false twist rotator 7 are arranged between the supply rollers 2a, 2b arranged close to the packages 1a, 1b and the take-off roller 3 common to the two. And the supply roller 2a on the package 1a side
The heater 4 is disposed between the heater 4 and the junction guide 5.
Further, a confounding nozzle 8 formed by compressed air is provided between the supply roller 9 and the downstream side of the take-off roller 3, and is finally wound up by the package 12.

From one package 1a to supply roller 2a
The yarn A drawn by the above becomes a yarn heated by the heater 4 before being joined at the junction P with the yarn B drawn from the other package 1b. The other package 1
The yarn B drawn from b is sent without heat treatment, and reaches the junction P as a yarn having a lower temperature than the yarn A. As described above, the supply speeds of the two yarns A and B pulled out from the supply rollers 2a and 2b may be the same or different from each other, depending on the characteristics of the supply yarn and the processing conditions. Just set it.

The two yarns A and B are joined at a joining point P,
While being taken up by the take-up roller 3, the twisting is performed on the upstream side of the false twisting rotor 7 and the untwisting is performed on the downstream side. When the false twisting is performed in this manner, the yarns A and B twisted on the upstream side of the false twist rotor 7 maintain the twisted state while the low temperature side yarn B is changed to the high temperature side yarn A. , Heat treatment is unevenly performed in the yarn axis direction and the diameter direction. As a result, the internal structure and the fiber shape change within and between the single yarns, and a non-uniform, short-period thick and thin structure and a short-period shrinkage difference occur in the yarn axis direction of the single fiber, Form a plurality of streak-like indentations in the diameter direction. In addition, it exhibits a wavy crimp due to false twist.

When the above-described false twisting is performed, the cooling plate 6 disposed on the upstream side of the false twisting rotor 7 cools and fixes the crimped structure formed by the false twisting, and simultaneously performs the false twisting. It contributes to stable processing by regulating the yarn path and preventing vibration. Next, the processed yarn after the false twisting is entangled by the entanglement nozzle 8 between the take-up roller 3 and the supply roller 9, and then wound up on the package 12.

In the above false twisting step, one polyester yarn A of the constituent yarns has a boiling water shrinkage ratio of -5 to 10% and a crystallinity of 25 to 50%, and the other polyester yarn B has a boiling water shrinkage ratio of 25%. In order to set the temperature of the yarn to 80 to 180 ° C. in order to make the crystallinity 15 to 40% and the crystallinity 2 to 15%,
Set the temperature of. Further, after the processing, the false twisted yarn unwound from the package 12 is subjected to 100-3000 times / m additional twist, and 50-70 ° C for dry heat or 3 for wet heat.
A heat treatment is performed at a temperature of 0 to 60 ° C. for about 10 minutes to 24 hours so that twist setting is performed.

Alternatively, when such a twisting set is not performed, the false twisting may be performed by setting the yarn temperature to 140 to 215 ° C. by the heater 4.

[0033]

EXAMPLES In the following examples, the crystallinity and boiling water shrinkage of the yarn were measured by the following measuring methods. [Crystallinity] Ramanor T-64000 (Jobi
n Yvon) as Raman microscopy, and the objective lens is × 1
00, the light source is an Ar + laser (NEC GLG346
0), 5145 angstroms, a single mode using a diffraction grating of 1800 gr / mm, a slit width of 100 μm, and a CCD (Jobin Yvon 10) as a detector.
24 × 256). Then, the crystallinity chi (%) when the full width at half maximum of Ramabando around 1730 cm ^-1 = [nu ₁₇₃₀ and ^{(cm -1), χ = 100} × ((30.5- = ν 1730) / 209- 1.
335) / (1.455-1.335).

[Boiling water shrinkage] For the composite yarn for measurement, a yarn which is not entangled in advance is used, and when twisted, the twist is returned and measurement is performed for each of yarn A and yarn B. It shall be. The measurement method is JIS L-1090-1
It was determined based on a test method of a boiling water shrinkage ratio A method (kettle shrinkage ratio) of 992. Assuming that the original length of the sample is L _O and the length of the sample after the boiling water treatment is L ₁ , it is obtained from the following equation.

The boiling water shrinkage = _{[(L O -L 1) / L} O ] by melt spinning × 100 Example 1 Polyethylene terephthalate polymer at a high speed by a conventional method, each breaking elongation 188
%, 85 denier, 48 filaments, a half-drawn polyester yarn A, and a 185% cut elongation, 125 denier, 18 filaments, a half drawn yarn B.
And was made.

The polyester yarns A and B obtained as described above are set as yarns A and B in the false twisting step (false twist rotor: circumscribed friction false twisting device) shown in FIG. 1, respectively. The supply speed of both yarns A and B is the same at 212 m / min,
The take-up speed was 339 m / min, and the number of false twists was 1860 turns /
After the composite false twisting was performed by setting the m and the heater temperature to 130 ° C., the composite false twisted yarn obtained by entanglement with the entanglement nozzle 8 was wound around the package 12.

Next, the composite false twisted yarn is unwound from the package 12 and subjected to 500 twists / m of additional twist.
After a heat treatment for 4 hours, twist setting was performed. At this time, the polyester yarn A of the composite false twisting yarn after the twisting set,
When the boiling water shrinkage and crystallinity of B were measured, the yarn A had a boiling water shrinkage of 8% and a crystallinity of 30%, and the yarn B had a boiling water shrinkage of 38% and a crystallinity of 2 to 7%. Was.

Next, the composite false twisted yarn set with the above-mentioned twisting was used as a warp and a weft and woven into a plain woven fabric of 53 warps / inch and 55 wefts / inch. This fabric is heated at a temperature of 9
It was subjected to a scouring process at 7 ° C., and was further dyed to give a finished fabric. The resulting product fabric formed a deep fabric crimp, had a soft surface touch, and had high resilience.

Example 2 The polyester yarns A and B obtained by the high-speed melt spinning of Example 1 were processed under the same conditions as in Example 1 except that the temperature of the hot plate 4 was changed to 180 ° C. The process yielded a composite false twisted yarn. When the boiling water shrinkage and the crystallinity of the polyester yarns A and B of the composite false twisted yarn were measured, the yarn A had a boiling water shrinkage of 6% and a crystallinity of 45%, and the yarn B had a boiling water shrinkage. The crystallinity was 25% and the crystallinity was 6%.

The composite false twisted yarn was woven into a plain woven fabric under the same conditions as in Example 1, and further subjected to a scouring process and a dyeing process under the same conditions to obtain a product woven fabric. The product woven fabric is Example 1
, Formed a deep woven crimp, had a soft surface touch, and had high resilience.

[0041]

As described above, according to the present invention, at least two types of polyester yarns constituting the composite yarn are reduced in boiling water shrinkage ratio and crystallinity, so that they are woven into a woven fabric and subjected to wet heat treatment. When this is done, a deep fabric crimp can be developed and high resilience characteristics can be imparted. Also, 2
The difference in shrinkage between the polyester yarns A and B causes the yarn A on the low shrinkage side to float on the surface of the woven fabric to give a soft touch to the surface touch. Further, since the shrinkage is low, the area shrinkage after the dyeing process is reduced. It is possible to obtain the above-described high-resilience polyester fabric with a relatively small amount of yarn while suppressing the amount of yarn.

[Brief description of the drawings]

FIG. 1 is a process diagram showing an example of a composite processed yarn production process used in the method for producing a polyester fabric of the present invention. 1a, 1b Package 2a, 2b Supply roller 3 Take-up roller 4 Heater 6 Merging guide 7 False twist rotor 8 Entangling nozzle

Claims (7)

[Claims] 1. A polyester yarn A having a boiling water shrinkage of -5 to 10% and a crystallinity of 25 to 50%, and a boiling water shrinkage of 15 to 40% and a crystallinity of 2 to 15%. A method for producing a polyester woven fabric, comprising weaving a woven fabric using a composite yarn in which at least two kinds of yarns with a polyester yarn B are mixed, and wet-heat-treating the woven fabric in a relaxed state to develop woven crimp. 2. The yarn according to claim 1, wherein the composite yarn is a false twisted yarn.
3. The method for producing a polyester fabric according to item 1. 3. The method for producing a polyester fabric according to claim 1, wherein the wet heat treatment under the relaxation condition is a scouring step. 4. The method according to claim 1, wherein the wet heat treatment is performed at a temperature of 60 to 135 ° C. 5. A yarn having a temperature difference of at least two kinds between a heat-treated high-temperature yarn and a yarn having a lower temperature than the heat-treated yarn, and are joined in a false-twisting system and false-twisted. 5. The method for producing a polyester fabric according to claim 1, wherein the composite yarn is produced by heat-treating the low-temperature yarn with the high-temperature yarn during the false twisting. 6. The heat treatment temperature of the high temperature side yarn during the false twisting is set to 80 to 180 ° C., the low temperature side yarn is set to room temperature, and the composite yarn after the false twisting is twisted. 5 with dry heat
The method for producing a polyester fabric according to claim 5, wherein the twist-setting is performed at 0 to 70C or 30 to 60C with wet heat. 7. The method for producing a polyester fabric according to claim 5, wherein the heat treatment temperature of the high-temperature side yarn during the false twisting is set to 160 to 215 ° C., and the low-temperature side yarn is set to room temperature.