JPH09143826A - Polyester mixed fiber yarn with different shrinkage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the polyester mixed fiber yarn as a new silky material, having soft surface touch, stiffness feeling and light weight feeling in addition to the characteristics of conventional silky materials by arranging a fine denier yarn as the low shrinkage component of a polyester mixed fiber yarn with different shrinkages, and a thick hollow fiber yarn as the high shrinkage component. SOLUTION: This polyester mixed fiber yarn with different shrinkages is obtained by a method of a composite spinning of two polyester components and stretching with a heat treating the non-stretching mixed fiber yarn 14 consisting of groups of filaments 10, 11 of each of the components through heating-type godet rolls 15, 17, etc. The low heat shrinkage component is substantially a PET having <=1.5d monofilament fineness, and the high heat shrinkage component is a hollow fiber of a copolymerized PET ([η] >=0.65) having >=200 deg.C start melting temperature and 3-5d monofilament fineness, the difference in shrinkages in boiling water between the two components is 10-25%, and the shrinkage of the mixed fiber yarn in boiling water and an extreme value in the stress of a heat shrinkage are 18-30% and >=0.28g/d, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new polyester new silky material and an economically advantageous manufacturing method thereof. More specifically, the present invention relates to a polyester different shrinkage mixed yarn having a soft surface touch, a firmness and a lightweight feeling in addition to the swelling feeling of a conventional material, and a direct spinning drawing method (also referred to as a spin draw take-up method) thereof. ) Related to the manufacturing method.

[0002]

2. Description of the Related Art Polyester different shrinkage mixed yarn has been known for a long time in order to bring synthetic fibers close to silk (for example, US Pat. No. 1190078). That is, a so-called different shrinkage mixed yarn composed of a fiber group of two components having different heat shrinkages causes a difference in yarn length between the two components when subjected to a heat treatment, and a bulging feeling appears. It applies the expression principle of natural silky swelling feeling. Initially, we started with the ones with a small difference in heat shrinkage, and proceeded to those with a large difference. Japanese Patent Publication No. 51-30620 discloses a polyester different shrinkage mixed yarn having a small difference in shrinkage ratio.

Typical prior arts having a large difference in heat shrinkage are (a) Japanese Patent Publication No. 53-134946 and (b) Japanese Patent Publication No. 55-57013.
Both (a) and (b) are characterized in that the low heat-shrinking component consists essentially of polyethylene terephthalate, and the high heat-shrinking component consists of copolymerized polyethylene terephthalate, which has a high heat shrinkage stress and a large boiling water shrinkage rate. is there. The comonomer used in the copolymerized polyethylene terephthalate used in (a) and (b) is 2,2-bis [4- (2-hydroxyethoxy)].
Phenyl] propane. 2 in (a) and (b)
The single yarn fineness of the components is the same, and the cross-sectional shape is trilobal.

In addition, the conventional method for producing polyester different shrinkage mixed yarns including (a) and (b) is to produce yarns of two components separately and mix them in a subsequent step, or to use two-component polymers. It is a method in which composite spinning is carried out, the filament is once drawn as a mixed fiber unstretched yarn, and then twisted (for example, FIG. 3). With the sophistication of fashion clothing in recent years, sophistication and diversification of silky materials have been required. On the other hand, in the era of "yen appreciation" or "price destruction", high level cost competitiveness is required even though it is a differentiating material.

As an economical process for melt-spun synthetic fibers, a direct spinning and drawing method (spin draw take-up method) in which a conventional spinning step and a twisting step are divided into two steps is made into one step is used for clothing. It has become widely used industrially in the production of general yarns of the series. As shown in FIG. 1, the direct spinning and drawing method for general yarns is performed by using a drawing machine including a heating type first godet roll, a heating type second godet roll, and a winding machine. At the same time as the undrawn yarn is taken up by the first godet roll, it is heated to 80 to 100 ° C. and drawn between the second godet roll and the first godet roll by utilizing the peripheral speed ratio of the two godet rolls. Then, the drawn yarn is 100 to 180 ° C. on the second godet roll.
It is common to perform a relaxation heat treatment at the temperature of 1 and then roll to form a cheese-like package.

However, at present, by simply applying this commonly used direct-spinning drawing method to polyester different shrinkage mixed yarn, no matter what copolymerized polyethylene terephthalate is used, unsatisfactory heat shrinkage property, that is, low heat shrinkage is obtained. Only mixed yarn with different shrinkage of stress can be obtained. Recently, (C) JP-A-7-35606 and (D) JP-A-7-207.
In Japanese Patent No. 541, a proposal has been made to obtain a polyester different shrinkage mixed fiber yarn by a direct spinning drawing method. (C) is a method in which the first godet roll is non-heated and has a mirror finish so that yarn breakage can be reduced even at a high speed, but only those having a low hepatorenal heat shrinkage stress have been obtained. In the same manner as in the present invention, (d) has 0.28 g / d or more as the heat shrinkage stress, but copolymer polyethylene terephthalate is used also as the low heat shrinkage component, and the intrinsic viscosity [η], that is, the molecular weight of the high heat shrinkage component is This is achieved by raising the levels above those normally used for clothing threads. There is no disclosure of specific methods and conditions for the direct spinning and drawing method.

[0007]

[Materials to be Solved by the Invention] In the new silky era, materials are required to have a soft surface touch, elasticity, and lightness in addition to the swelling and silky luster of conventional materials. is there. Further, from the economical aspect of the post-processing, it is required to make the yarn package large (increase the winding weight). This is because the smaller the winding weight, the more the creel, that is, the number of times of thread preparation, and the more labor required, which is uneconomical.

At present, polyester different shrinkage mixed yarn is spun,
Due to the fact that it is produced by the two-step method of twisting, it has a bun shape (Fig. 7) and at most 3 kg. On the other hand, in the cheese-like package of the direct spinning drawing method (FIG. 8), 6 to 12 kg can be wound. Therefore, a first object of the present invention is to provide a new silky material having a soft surface touch, a firm feeling and a lightweight feeling in addition to the characteristics of the conventional silky material, and a large package thereof. In addition, the present invention
In addition, in producing such a new silky material, and in using it in a post-processing step, the new silky material, i.e., the new polyester, is produced by the direct spinning drawing method, which is economically advantageous, that is, low cost. An object of the present invention is to provide a method for producing a different shrinkage mixed yarn.

As a result of diligent research on the above problems, the present inventors have determined that the low shrinkage component of the polyester different shrinkage mixed yarn is a modified yarn having a relatively small single yarn fineness, and the high shrinkage component is a relatively single yarn fineness. It was found that the desired properties of the new silky material can be obtained by making a large hollow fiber, and the heat treatment after drawing is performed in a tension state rather than in a relaxed state as in the conventional direct spinning and drawing method. Thus, a polyester different shrinkage mixed fiber having high heat shrinkage and difference in heat shrinkage and high heat shrinkage stress, which is obtained by the conventional two-step spinning-twisting method, can be obtained by the direct spinning drawing method. Heading, the present invention was completed.

[0010]

Means for Solving the Problems The present invention is a substance 2, a manufacturing method 2
It consists of four inventions in total. That is, the first invention of the substance is a polyester hetero-shrink mixed yarn composed of a low heat shrinkage component and a high heat shrinkage component, wherein the low heat shrinkage component consists essentially of polyethylene terephthalate, and the high heat shrinkage component has a melting start temperature. Intrinsic viscosity [η] is 0.65 at 200 ℃ or higher
A boiling water shrinkage rate of the heterogeneous shrinkage mixed fiber made of the following copolymerized polyethylene terephthalate is 18 to 30%, and an extreme value of heat shrinkage stress is 0.28 g / d or more, and a difference in boiling water shrinkage rate between both shrinkage components. Is 10 to 25%, the single yarn fineness of the low heat shrinkage component is 1.5 denier or less, each single yarn of the high heat shrinkage component is hollow, and the fineness thereof is 3 to 5 denier. It is a polyester different shrinkage mixed yarn.

However, boiling water shrinkage rate = {(L ₁ -L ₂ ) / L ₁ } × 100 (%) L ₁ : Length of original yarn before boiling water treatment (cm) L ₂ : Boiling at 100 ° C. without load The second invention of the yarn length (cm) substance after soaking in water for 30 minutes is a polyester different shrinkage mixed yarn composed of a low heat shrinkage component and a high heat shrinkage component, wherein the low heat shrinkage component is substantially polyethylene. Terephthalate, the high heat shrinkage component is a copolymerization polyethylene terephthalate having a melting start temperature of 200 ° C. or more and an intrinsic viscosity [η] of 0.65 or less, and the boiling water shrinkage of the heterogeneous shrinkage mixed filament yarn is 18 to 3.
0% and the extreme value of heat shrinkage stress is 0.28 g / d or more,
The difference in shrinkage rate of boiling water between both shrinkage components is 10 to 25%, and the single yarn fineness of the low heat shrinkage component is 1.5 denier or less,
A polyester hetero-shrinking mixture characterized in that each single yarn of the high heat-shrinking component is hollow and has a fineness of 3 to 5 denier, and the hetero-shrinking yarn is wound in a cheese-like package without twisting. It is a yarn.

However, boiling water shrinkage rate = {(L ₁ -L ₂ ) / L ₁ } × 100 (%) L ₁ : raw yarn length (cm) before boiling water treatment L ₂ : boiling at 100 ° C. without load The yarn length after being immersed in water for 30 minutes (cm) The first invention of the manufacturing method is the composite spinning of two-component polyester, and the obtained mixed fiber undrawn yarn is directly spun using a two-stage heating type godet roll. When a polyester different shrinkage mixed fiber is produced by a drawing heat treatment by a drawing method, substantially polyethylene terephthalate is used as a low heat shrinkage component, and an intrinsic viscosity [η] of 0.65 or less at a melting start temperature of 200 ° C. as a high heat shrinkage component. The mixed fiber undrawn yarn using the copolymerized polyethylene terephthalate is heated and drawn between the first godet roll and the second godet roll to form a mixed fiber drawn yarn,
Then, a heater is built only in the vicinity of the yarn introduction part, and the roll surface temperature of the heater built-in part is 110 to 160 ° C.
Of a polyester heterogeneous shrinkage mixed yarn, characterized in that the stretched mixed filament yarn is heat-treated under tension on a second godet roll of an inclined temperature type kept at a temperature of 100 ° C., and then wound as a cheese-like package without substantial relaxation shrinkage. It is a manufacturing method.

In the second invention of the production method, the composite fiber unstretched yarn obtained by composite spinning of two-component polyester is a heating type godet roll in at least the first stage and the second stage.
When a polyester different shrinkage mixed fiber is produced by the stepwise godet roll type direct spinning drawing method, polyethylene terephthalate is substantially used as the low heat shrinkage component, and the intrinsic viscosity [η] at the melting start temperature of 200 ° C. or higher is the high heat shrinkage component. The mixed fiber undrawn yarn using 0.65 or less of copolymerized polyethylene terephthalate was used as the first godet roll and the second godet roll.
It is drawn by heating between godet rolls to form a mixed fiber drawn yarn, which is then wound around a second godet roll whose surface temperature is maintained at 110 to 160 ° C., and the peripheral speed ratio of the third godet roll and the second godet roll is 1.00. By setting 1.10, the mixed fiber drawn yarn is subjected to a tension heat treatment on a second godet roll, and then wound as a cheese-like package through a third godet roll kept at 50 ° C. or less without substantial relaxation shrinkage. It is a method for producing a polyester different shrinkage mixed fiber yarn, which is characterized by taking.

The present invention is directed to a polyester hetero-shrink mixed yarn composed of a low heat-shrinking component and a high heat-shrinking component, and a method for producing the same. In particular, the heat-shrinking property, among them, the heat measured by boiling water shrinkage and dry heat The extreme value of shrinkage stress is an important requirement. Hereinafter, the present invention will be described in detail. First, the substance invention of the present invention will be described. The low heat shrink component of the present invention needs to consist essentially of polyethylene terephthalate. The homopolymer polyethylene terephthalate is
When made into fiber, the heat shrinkage stress is high, and its extreme value is 0.28
Although it is more than g / d, the boiling water shrinkage ratio is at most 10%, so it is suitable as a low heat shrinkage component. The highly heat-shrinkable component of the present invention may be a copolymerized polyethylene terephthalate having a melting start temperature (commonly referred to as Tm1) of 200 ° C. or more and an intrinsic viscosity [η] of 0.65 or less as measured by a differential scanning calorimeter (DSC). is necessary. Copolymerized polyethylene terephthalate has an extreme value of heat shrinkage stress of 0.28 when formed into a fiber by selecting the type of comonomer and the copolymerization ratio.
Since it is g / d or more and the boiling water shrinkage can be 18% or more, it is suitable for a high heat shrinkage component.

The Tm1 of this highly heat-shrinkable copolymerized polyethylene terephthalate must be 200 ° C. or higher. Polyester fibers are often subjected to a heat treatment at around 200 ° C. in a post-processing step. If Tm1 is 200 ℃
If less than, the heat treatment causes partial melting,
The desired fabric cannot be obtained. The preferable range of Tm1 is 215 ° C or higher. Furthermore, the intrinsic viscosity [η] of the highly heat-shrinkable component copolymerized polyethylene terephthalate is 0.65.
Must be: When [η] exceeds 0.65, solid phase polymerization is required following ordinary melt polymerization, which not only increases cost but also increases melt viscosity during spinning, thus requiring a high-pressure spinning machine. . The preferable range of [η] is 0.62 to 0.55.

The most preferred comonomers used for the copolymerized polyethylene terephthalate in the present invention are 2,2
-Bis [4- (2-hydroxyethoxy) phenyl] propane, 2,2-bis [4- (2-hydroxyethoxy) phenyl] sulfone, neopentyl glycol, etc. are relatively bulky comonomer, and these and others Also preferred are those in combination with the comonomers of. The polyester of the low heat shrinkage component and the high heat shrinkage component may be produced by a known polymerization method and may contain additives such as a heat stabilizer and a matting agent. The polyester different shrinkage mixed yarn in the present invention must have an extreme value of heat shrinkage stress of 0.28 g / d or more as shown in FIG. When the extreme value of the heat shrinkage stress is less than 0.28 g / d, even if the boiling water shrinkage ratio in the weightless treatment is high, the fiber cannot be shrunk by overcoming the constraint of the woven fabric during the heat treatment in the dyeing process, etc. There is no bulge.

The boiling water shrinkage of the polyester different shrinkage mixed yarn should be 18 to 30%. If it is less than 18%, even if the extreme value of the heat shrinkage stress is as high as 0.28 g / d or more, the degree of shrinkage in the heat treatment process such as the dyeing process is low when it is made into a woven fabric. This will not cause a difference in yarn length. If the boiling water shrinkage exceeds 30%, the fabric will be excessively shrunk, and the texture will be hardened and the fabric width will be insufficient. The preferable range of the boiling water shrinkage ratio is 20 to
25%. The difference in boiling water shrinkage between the high heat shrinkage component and the low heat shrinkage component of the polyester different shrinkage mixed yarn must be 10 to 25%. If the difference in boiling water shrinkage is less than 10%, even if the woven fabric after heat treatment is sufficiently shrunk, the difference in yarn length is insufficient and a sufficient bulge cannot be obtained. Therefore, it is unsuitable as a new silky material. Become. On the other hand, if the difference in boiling water shrinkage exceeds 25%, the yarn length difference becomes too large, and the surface of the woven fabric after heat treatment becomes non-uniform, resulting in loss of commercial value.
The preferable range of the difference in shrinkage rate of boiling water is 13 to 23%.

The single-filament fineness of the low heat-shrinkable component of the polyester different shrinkage mixed yarn should be 1.5 denier or less. The low heat shrinkage component is exposed to the outside after heat treatment and becomes a so-called sheath yarn, which is related to the surface touch of the fabric. When the single yarn fineness is 1.5 denier or more, a preferable soft surface touch cannot be obtained. The preferred single yarn fineness range is 1.3
It is less than denier. Further, it is preferable that 50% or more of the single yarn of the low heat shrinkage component has a modified cross section in order to obtain a good gloss feeling.

The single yarn fineness of the high heat shrinkage component of the polyester different shrinkage mixed yarn should be 3 to 5 denier.
When the single yarn fineness is less than 3 denier, it lacks firmness and elasticity and becomes unsuitable as a new silky material.
If the single yarn fineness exceeds 5 denier, the elasticity and elasticity will be excessive, which is not preferable. The preferred single yarn fineness range is 3 to 4.5 denier. The highly heat-shrinkable component of the polyester different shrinkage mixed yarn must be hollow. if,
If it is not hollow, the fabric cannot be given a lightweight feel. Light weight means that it feels lighter than the impression of bulkiness. The cross-sectional shape of the low heat shrinkage component is preferably trilobal. FIG. 9 is a preferred example of the cross-sectional shape of the different shrinkage mixed yarn of the present invention.

The polyester different shrinkage mixed yarn must be untwisted and wrapped in a cheese-like package. The yarn obtained by the direct spinning and drawing method is usually wound as a cheese-like package by a winder. The yarn obtained by passing through the twisting machine is twisted in a pan shape, but twisted in a cheese package. In order to keep up with the modernization and rationalization of post-processing processes in recent years, the package must be large, that is, it must be wrapped in a cheese-like package capable of mass-rolling. It is also possible to rewind the yarn wound in a pan to form a cheese-like package, at which time the yarn becomes twisted, which is distinct from the non-twisted cheese-like package of the present invention.

Next, the invention of the manufacturing method of the present invention will be described. The production method of the present invention is a composite spinning of a two-component polyester of a low heat-shrinking component and a high heat-shrinking component, and the resulting unstretched mixed fiber yarn has two stages (referred to as the first invention of the production process) or three stages (the production process The present invention is directed to a method for producing a polyester mixed fiber by a direct spinning drawing method utilizing a godet roll (referred to as a second invention). Also in the invention of the production method, the low heat shrinkage component of the polyester different shrinkage component is substantially polyethylene terephthalate, and the high heat shrinkage component has an intrinsic viscosity [η] when the melting start temperature (Tm1) measured by a differential scanning calorimeter is 200 ° C. or higher. Must be 0.65 or less, and must be copolymerized polyethylene terephthalate. The reason and incidental requirements are exactly the same as the material invention.

In the manufacturing method invention, as shown in FIGS. 1 and 2, the mixed fiber undrawn yarn drawn by the first godet roll 15 is wound several times on the first godet roll 15 maintained at a predetermined temperature. It must be (lapped), heated and stretched at the peripheral speed ratio of the second godet roll 17 and the first godet roll 15. The temperature of the first godet roll 15 is preferably 70 to 100 ° C. This stretching operation imparts desired mechanical properties, such as breaking strength and breaking elongation. The drawn yarn must then be introduced into the second godet roll 17, wrapped several times on the second godet roll 17 and heat treated in tension, ie tension heat treated.

In the first manufacturing method (FIG. 1), the second godet roll 17 is an inclined temperature type godet roll (FIG. 5) in which a heater is incorporated only in the yarn introducing portion, and the surface of this roll is as shown in FIG. It must exhibit a ramp temperature, that is, the yarn inlet is hot and the outlet cold. The roll surface temperature in the vicinity of the yarn introduction portion, that is, in the heater built-in portion, must be 110 to 160 ° C, and 30 to 70 ° C is preferable at the outlet portion. As described above, the tension heat treatment with the inclined temperature type godet roll is possible only in the first half of the second godet roll where the yarn tension is high (near the yarn introduction portion).
It is presumed that this is because the tension heat treatment of the yarn occurs due to the high temperature, and the yarn is cooled and the relaxation does not occur due to the low temperature in the latter half of the second godet roll (near the outlet of the yarn).

Further, in order to make the effect of the tension heat treatment by the gradient temperature type godet roll remarkable, a so-called taper type roll having a larger diameter at the yarn outlet than the diameter at the yarn introducing portion is preferable as the second godet roll. In the case of the taper type godet roll, the yarn is gradually stretched according to the diameter ratio as it is wrapped, and the tension state is maintained on the godet roll, so that sufficient tension heat treatment is performed. On the other hand, in the second production method (FIG. 2), the second godet roll 17 may be a normal heating type godet roll having a heater built in the entire godet roll instead of the gradient temperature type, and the surface temperature of the drawn yarn is 110 ° C. to 160 ° C. It is wound around the maintained second godet roll 17, and the peripheral speed ratio between the third godet roll 18 and the second godet roll is 1.00 to
A tension heat treatment must be done by setting it to 1.10.

If the surface temperature of the second godet roll is 11
If the temperature is lower than 0 ° C., the boiling water shrinkage rate becomes 30% or more, excessive shrinkage of the fabric occurs, and the texture is hardened, which is not preferable. In addition, the surface temperature of the second godet roll is 16
If it is 0 ° C or higher, the difference in shrinkage rate of boiling water is less than 10%,
The texture of the fabric becomes poor. The preferable temperature range of the second godet roll is 120 to 150 ° C. The peripheral speed ratio of the third godet roll 18 and the second godet roll 17 is 1.00.
If less than 1.1, sufficient tension heat treatment is not achieved and 1.1
If it exceeds 0, re-stretching will occur, leading to fuzz formation. The preferable range of the peripheral speed ratio is 1.01 to 1.05.

The temperature of the third godet roll must be below 50 ° C. If it exceeds 50 ° C., relaxation shrinkage occurs between the third godet roll and the winder, resulting in a decrease in heat shrinkage stress. It is preferably 40 ° C. or lower and 10 ° C. or higher.
In the invention of the manufacturing method, the second godet roll 1 is used.
The heterogeneous shrinkage mixed yarns exiting from the No. 7 and the third godet roll 18 can be entangled by the interlacer 19 and then wound into a cheese-like package by the winder 20.

A method of composite spinning a two-component polymer of a low heat shrinkage component and a high heat shrinkage component to obtain a mixed fiber undrawn yarn is as follows:
A known method, for example, the method described in US Pat. No. 3,381,074 may be used. That is, substantially polyethylene terephthalate and copolymerized polyethylene terephthalate are melt-extruded by the two extruders 3 and 4, and passed through a spin head 7 and a pack 8 which are designed so that both polymers are delivered without joining. Both polymers are discharged from separate holes in the spinneret 9. Then, after cooling and applying a finishing agent, the mixed fiber undrawn yarn 14 is taken up by the first godet roll 15 of the drawing machine rotating at a predetermined speed.
Becomes However, another take-up roll (pre-tension roll) arranged before the first godet roll of the stretching machine
To obtain an unstretched mixed fiber yarn, and then the first of the stretching machine
It may be introduced into the godet roll 15.

Further, the composite spinning section common to FIGS. 1 and 2 will be described below. Polyethylene terephthalate is fed to the A side and copolymerized polyethylene terephthalate to the B side. The dried pellets of both polymers are supplied to the hoppers 1 and 2 and then melted in the extruders 3 and 4, and the melt is supplied to the spin head 7 through the bends 5 and 6, respectively. Both polymers are weighed and reach the spinneret 9 via separate channels 8. Both polymers were discharged from separate holes of the spinneret 9 without merging,
Two types of filament groups 10 and 11 are formed. After being cooled with cooling air 12 while being thinned, a finishing agent is applied by a finishing agent applying device 13, taken up by a take-up roll 15 at a predetermined speed, and supplied to a stretching machine.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to Examples. In the present invention including Examples, the extreme value of heat shrinkage stress, the melting onset temperature and the intrinsic viscosity are measured by the following methods. (1) Extreme value of thermal shrinkage stress It is measured using a thermal stress measuring device (for example, Kanebo Engineering Co., Ltd., trade name KE-2). A thread (multifilament) is cut into a length of 20 cm, and both ends of the thread are tied to form a ring, which is then loaded into a measuring machine. Initial load 0.05
The measurement is performed under the conditions of g / d and a temperature rising rate of 100 ° C./min, and the temperature change of thermal stress is drawn on the chart. Read the peak value of the thermal stress curve. That value is the extreme value of the heat shrinkage stress.

(2) Melting start temperature (Tm1) Measured using a differential scanning calorimeter. Take 10 mg of thread and stuff into bread. The temperature is raised at a heating rate of 20 ° C./min and a calorific curve is drawn on the chart. The melting start temperature is read from the melting point peak of the obtained calorific curve. (3) Intrinsic viscosity [η] Intrinsic viscosity [η]
It is measured at a polymer concentration of 1 g / dl.

[0031]

Example 1 The following polymers were used. Low heat shrinkage component: polyethylene terephthalate with [η] = 0.60 (containing 0.5 wt% TiO ₂ ) High heat shrinkage component: 2,2-bis [4- (2-hydroxyethoxy) phenyl] sulfone and diol component Copolymerized polyethylene terephthalate of [η] = 0.60 (containing 0.5 wt% of TiO ₂ ) as a spinning machine and a composite spinning machine as shown in FIG. Using a two-stage godet roll type drawing machine, direct spinning drawing winding (spin draw take-up) was performed.

The first godet roll and the second godet roll of the stretching machine are both heating types, the first godet roll is a normal heating roll (constant temperature type), and the second godet roll is a gradient temperature type. The spinning, drawing and winding conditions are as follows. Under this condition, polyester mixed yarn 48d /
30f, that is, the low heat shrinkage component side is a single yarn 1 denier, 2
A hollow fiber having a trifilament of 4 filaments, a high heat shrinkage component side having a single denier of 4 denier and 6 filaments was obtained.

(Spinning Conditions) Low heat shrinkage component side High heat shrinkage component side Extruder heater temperature 295 ° C. 280 ° C. Bend temperature 295 ° C. 280 ° C. Spin head temperature 295 ° C. 295 ° C. Spinneret Y type hole (24 holes) C type hole (6 Hall) Discharge rate 13.1 g / min 13.1 g / min Cold air velocity 0.3 m / sec 0.3 m / sec Finishing agent attachment rate 0.7 wt% 0.7 wt% (stretching conditions) First godet roll temperature 90 ° C. peripheral speed 2000 m / min Lap number 7.5 Second godet roll temperature Yarn introduction part 130 ° C. yarn exit part 70 ° C. Circumferential speed 5000 m / min ie draw ratio 2.50 times Lap number 6.5 Winding speed 4940 m / min Winding speed / first 2 Godet roll peripheral speed = 0.988 Winding tension 0.15g / d Winding weight 6Kg This composite spinning machine is 6END type, that is, the spinneret is 6
Each of them is equipped with 6 different shrinkage mixed yarns 48d / 30f
Were simultaneously spun, drawn and wound. The roll weight of the cheese-like package of each END was 6 kg. Physical properties of the 6END different shrinkage mixed yarn are as shown in Table 1.

[0034]

[Table 1]

When the polyester different shrinkage mixed yarn of each END was made into a tubular knitted fabric and evaluated after heat treatment in boiling water at 100 ° C. for 30 minutes, the swelling feeling, which is indispensable for the New Silky material, was of course given a soft surface touch and a suitable touch. It was wonderful with a firm and light feel.

[0036]

[Comparative Example 1] The second godet roll of the stretching machine used in Example 1 was changed from the gradient temperature type to the normal type, and the temperature was adjusted to 1
A polyester different shrinkage mixed yarn 48d under exactly the same conditions as in Example 1 except that the winding speed was changed to 4875 m / min in order to set the winding tension to 0.20 g / d. / 30f was manufactured. That is, this comparative example is an example in which a polyester mixed fiber having the same structure as the present invention was obtained by a conventional direct spinning drawing method. Table 2 shows the physical properties of the obtained yarn.

[0037]

[Table 2]

A polyester mixed yarn of each END was used in Example 1.
When evaluated under the same method and under the same conditions as above, the bulging feeling, which is essential for the new silky material, was lacking, and the feeling of lightness was not felt even though it contained hollow fibers.

[0039]

[Examples 2 to 5 and Comparative Examples 2 to 5] This example and the comparative example are the same as those in Example 1 except that the second example
It shows the effect when the kind of godet roll and the temperature condition are changed. As the second godet roll, two types, the same as the gradient temperature type godet roll used in Example 1 and the taper type godet roll which is of the gradient temperature type and whose diameter of the yarn outlet is larger than the diameter of the yarn introducing portion, are used. did. Each of the godet rolls was directly spun and drawn and wound under the temperature conditions shown in Tables 3 and 4. Others
The same method and conditions as in Example 1 were used. The physical properties of the obtained yarn are shown in Tables 3-4.

[0040]

[Table 3]

[0041]

[Table 4]

[0042]

Example 6 This example relates to a three-stage godet roll type direct spinning drawing method as shown in FIG. Example 1 is 48d / 30f under exactly the same method and conditions except for the following heat treatment conditions, that is, a single yarn 1 denier and 24 filaments on the low heat shrinkage component side and a single yarn 4 denier and 6 filaments on the high heat shrinkage component side. Manufacture yarn,
A cheese-like package of 6 kg each END was obtained. Table 5 shows the physical properties of the obtained yarn.

First godet roll temperature 90 ° C. peripheral speed 2000 m / min lap number 7.5 Lap number 2nd godet roll temperature 130 ° C. peripheral speed 4900 m / min or draw ratio 2.45 times lap number 6.5 Third godet roll temperature 40 ° C. peripheral speed 4950 m / min That is, draw ratio 1.01 times Lap number 4.0 Winding speed 4900 m / min Winding speed / Third godet roll peripheral speed = 0.990

[0044]

[Table 5]

The polyester different shrinkage mixed filament yarn of each END was made into a tubular knitted fabric, and evaluated after heat treatment in boiling water at 100 ° C. for 30 minutes. It was wonderful with a firm and light feel.

[0046]

Industrial Applicability According to the present invention, a new silky material which has a bulge, a soft surface touch, a feeling of elasticity, and a light weight is provided, which is unprecedented. Is possible. Further, the manufacturing cost has been significantly reduced by changing the manufacturing method from the conventional two-step method to the one-step method. Furthermore, since the package changed from a small amount of bun to a large amount of cheese-like package, rationalization in the post-processing process and cost reduction became possible.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the principle of the first production method of the present invention.

FIG. 2 is a schematic view showing the principle of the second production method of the present invention.

FIG. 3 is a conventional method (for example, Japanese Examined Patent Publication No. 53-134946).
FIG.

FIG. 4 is a graph showing heat shrinkage stress of each of the polyester different shrinkage mixed yarns according to the present invention and the conventional method.

FIG. 5 is a schematic view showing an inclined temperature type godet roll including a heater.

FIG. 6 is a graph showing the surface temperature between the yarn introducing portion and the yarn outlet portion of the inclined temperature type godet roll.

FIG. 7 is a schematic view showing a pan.

FIG. 8 is a schematic view showing a cheese-like package.

FIG. 9 is a schematic view showing an example of a cross-sectional shape of the different shrinkage mixed fiber of the present invention.

[Explanation of symbols]

 1 Hopper 2 Hopper 3 Extruder 4 Extruder 5 Bend 6 Bend 7 Spinhead 8 Pack 9 Spinneret 10 A component filament group 11 B component filament group 12 Cooling air 13 Finishing agent applying device 14 Mixed fiber undrawn yarn 15th 1 Godet Roll (Heating Type) 16 Separator Roll 17 Second Godet Roll (Heating Type) 18 Third Godet Roll 19 Interlacer 20 Winder (and Cheese Package) 21 Spin Head 22 Spinneret 23 Filament Group 24 Finishing Agent 25 Device Godet Roll 26 Unstretched Yarn 27 Winder (and Unstretched Yarn Cheese Package) 28 First Godet Roll (Non-Heating Type) 29 Hot Plate 30 Second Godet Roll (Non-Heating Type) 31 Winder (and Mixed Fiber Stretched Thread Pane) 32 Built-in heater 33 Bobbin for pan 34 Bobbin for cheese 35 Low heat shrinkage component 36 High heat shrinkage component 37 Hollow part

Claims (6)

[Claims] 1. A polyester hetero-shrink mixed yarn composed of a low heat shrinkage component and a high heat shrinkage component, wherein the low heat shrinkage component consists essentially of polyethylene terephthalate, and the high heat shrinkage component has a melting start temperature of 200 ° C. or higher. Intrinsic viscosity [η]
Is 0.65 or less and is made of copolymerized polyethylene terephthalate, and the boiling water shrinkage rate of the heterogeneous shrinkage mixed yarn is 18 to 30%,
And, the extreme value of heat shrinkage stress is 0.28 g / d or more, the difference in boiling water shrinkage between both shrinkage components is 10 to 25%, and the single yarn fineness of the low heat shrinkage component is 1.5 denier or less, A polyester differently-shrinkable mixed yarn, wherein each single yarn of the high heat shrinkage component is hollow and has a fineness of 3 to 5 denier. However, boiling water shrinkage ratio = {(L ₁ −L ₂ ) / L ₁ } × 100 (%) L ₁ : Length of original yarn before boiling water treatment (cm) L ₂ : No load 30 in boiling water at 100 ° C. Thread length (cm) after soaking for a minute 2. A polyester hetero-shrink mixed yarn comprising a low heat shrinkage component and a high heat shrinkage component, wherein the low heat shrinkage component consists essentially of polyethylene terephthalate, and the high heat shrinkage component has a melting start temperature of 200 ° C. or higher. Intrinsic viscosity [η]
Is 0.65 or less and is made of copolymerized polyethylene terephthalate, and the boiling water shrinkage rate of the heterogeneous shrinkage mixed yarn is 18 to 30%,
And, the extreme value of heat shrinkage stress is 0.28 g / d or more, the difference in boiling water shrinkage between both shrinkage components is 10 to 25%, and the single yarn fineness of the low heat shrinkage component is 1.5 denier or less, A polyester hetero-shrinking mixture characterized in that each single yarn of the high heat-shrinking component is hollow and has a fineness of 3 to 5 denier, and the hetero-shrinking yarn is wound in a cheese-like package without twisting. Yarn. However, boiling water shrinkage ratio = {(L ₁ −L ₂ ) / L ₁ } × 100 (%) L ₁ : Length of original yarn before boiling water treatment (cm) L ₂ : No load 30 in boiling water at 100 ° C. Thread length (cm) after soaking for a minute 3. The boiling water shrinkage ratio of the heterogeneous shrinkage mixed yarn is 18 to 25.
%, The difference in boiling water shrinkage between the two components is 12 to 23%, and 50% or more of the single yarn of the low heat shrinkage component has a modified cross-section. yarn. 4. A process for producing a polyester different shrinkage mixed fiber by subjecting a non-stretched mixed fiber obtained by composite spinning of two-component polyester to a drawing heat treatment by a direct spinning drawing method utilizing a two-stage heating type godet roll. , Polyethylene terephthalate is used as the low heat shrinkage component, and the intrinsic viscosity [η] is used as the high heat shrinkage component at a melting start temperature of 200 ° C.
Of 0.65 or less is used to heat the mixed fiber unstretched yarn between the first godet roll and the second godet roll to form a mixed fiber stretched yarn, and then only a heater is provided near the yarn introduction part. And the heater-incorporated portion has a roll surface temperature maintained at 110 to 160 ° C. on a second gradient temperature type godet roll. A method for producing a polyester heterogeneous shrinkage mixed yarn, comprising winding as a cheese-like package. 5. The polyester differential shrinkage mixed fiber yarn according to claim 4, wherein the second godet roll is a gradient temperature type and a taper type in which the diameter of the yarn outlet is larger than the diameter of the yarn introducing portion. Manufacturing method. 6. A composite fiber unstretched yarn obtained by subjecting a two-component polyester to a composite spinning, at least in the first stage and in the second stage.
When a polyester different shrinkage mixed fiber is produced by a three-stage godet roll type direct spinning drawing method in which the stage is a heating godet roll, polyethylene terephthalate is used as a low heat shrinkage component, and a melting start temperature of 200 is used as a high heat shrinkage component. A mixed fiber undrawn yarn using a copolymerized polyethylene terephthalate having an intrinsic viscosity [η] of 0.65 or less at a temperature of ℃ or more is heated and drawn between the first godet roll and the second godet roll to form a mixed fiber drawn yarn, and then the surface. Temperature 11
The mixed filament stretched yarn is wound on the second godet roll by winding it around the second godet roll kept at 0 to 160 ° C. and setting the peripheral speed ratio of the third godet roll and the second godet roll to 1.00 to 1.10. Tensile heat treatment, then 50 ℃
A method for producing a polyester heterogeneous shrinkage mixed yarn, comprising winding a cheese-like package through a third godet roll maintained below without substantially relaxing and shrinking.