JPH0735606B2 - Method for manufacturing polyester thermal shrinkage difference mixed yarn - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a polyester heat-shrink differential blended yarn which can impart good bulkiness and drapability when formed into a woven or knitted fabric. In particular, the present invention relates to a technique for producing a polyester thermal shrinkage differential mixed yarn by a direct spinning drawing method which produces a polyester thermal shrinkage differential mixed yarn at a higher speed and with a simple process.

[Prior Art] Woven and knitted fabrics using heat shrinkage difference mixed yarns are produced in large numbers as high value-added materials because they can impart bulkiness and drapability. In particular, polyester heat shrinkage difference mixed yarn is suitable for use as a high-grade silky material, and is therefore heavily used. The technology relating to this is disclosed in Japanese Examined Patent Publication No. 51-30620 and Japanese Examined Patent Publication No. 53-3.
1972, Japanese Patent Publication No. 55-22586, Japanese Patent Publication No. 58-3064
Many are disclosed as shown in Japanese Patent Publication No. However, these disclosed techniques have a drawback that productivity is low because the spinning process and the stretching process are separately manufactured, or the spinning and stretching are individually performed and then the fibers are mixed.

On the other hand, Japanese Utility Model Publication No. 50-32574 discloses that a yarn is divided into two yarn groups and discharged, and a feed roll and a draw roll provided for each yarn group are continuously drawn after spinning and then entangled to form a polyester. A technique of using a heat shrinkage difference mixed fiber is disclosed. However, installing a feed roll and a draw roll for each yarn group has the disadvantages that the equipment cost is high and a large equipment space is required.

In addition, Japanese Patent Publication No. 53-8823 can add a different color effect.
The same kind of polymer is discharged at the same time, and the fiber is drawn after spinning.
Disclosed is a method for producing a mixed fiber that is easily mixed.
It is possible to obtain a heat shrinkage-differential mixed yarn by applying a polymer capable of imparting a heat shrinkage difference to this technique, but the manufacturing technique disclosed here is estimated to have a winding speed of at most 2000 m / min. The productivity is low, and there is a drawback that the drawability becomes poor when the spinning speed is as high as 4000 m / min or more because a pin or a heating jet is used to fix the drawing point especially in the drawing zone.

On the other hand, the ordinary direct spinning and drawing method for polyester multifilaments is a well-known technique, and is now widely applied to industrial production. For example, Japanese Patent Publication Sho-50-3406
Japanese Patent Laid-Open Publication No. 2003-242242 proposes a method in which, after the spun yarn is cooled and solidified, it is taken up by the first godet roller, and subsequently, when it is guided to the second godet roller and drawn, the undrawn yarn yarn is preheated and drawn. . Further, a codet roller stretching method for heating the first codet roller is well known. In these methods, when the unstretched yarn is stretched, the polyester unstretched yarn is preheated to a glass transition temperature or higher to facilitate stretching.

Further, in recent years, there has been a demand for simpler equipment, low energy, and low cost yarns. However,
In the method using the first godet roller heated to 70 to 90 ° C., a large amount of labor was spent on proper heating control of the undrawn yarn in order to uniformly draw.

That is, when the yarn is heated by the hot roller to the vicinity of the glass transition point of the undrawn yarn, the yarn heating state changes depending on the oil moisture content, the yarn opening state, the contact time with the roller, the ambient temperature near the roller, etc. It was difficult to manage.

Further, as a defect of productivity, when the first godet roller is heated, the yarn tension on the roller is extremely lowered, so that there is a defect that yarn fluctuation increases and yarn breakage occurs. In addition, when the yarn sway on the second godet roller is also near 5000 m / min, the air flow accompanying the rotation of the roller also increases, and the yarn sway increases,
Even in the case of drawn yarn, there is a defect that yarn breakage occurs when there is contact between yarns.

Furthermore, since this conventional method uses an electric heater because it is easy to handle as a heat source for a hot roller, the electric heating cost is high, the equipment cost is high, and the stretching speed is 5000 m / min or less. I was not satisfied with the demand for high productivity, and there was room for improvement.

[Problems to be Solved by the Invention] An object of the present invention is to efficiently and stably heat-shrink differential blended yarns suitable for producing high-quality woven and knitted fabrics, particularly polyester silky high-grade woven and knitted fabrics, by a simple high-speed direct spinning drawing method. To provide a manufacturing method.

[Means for Solving the Problem] That is, according to the present invention, at least two kinds of polyesters having different melting points are melted and discharged from different discharge ports, cooled and solidified, and then the yarn is bundled and oiled within 3 m below the spinneret surface. 4000 m / mi with the first godet roller that is not heated and has a mirror finish
A method for producing a polyester heat-shrink differential blended yarn, comprising: taking over n or more, and then drawing between the first godet roller and the second godet roller.

The heat shrinkage-differential mixed yarn preferably has a shrinkage ratio of 5% or more in at least one of the boiling water shrinkage ratio and the 200 ° C. dry heat shrinkage ratio in order to exhibit the characteristics of the heat shrinkage-differential mixed yarn. More preferably, there is a shrinkage difference of 7% or more. This is a method of heat-treating a woven or knitted fabric using heat-shrinkage difference mixed fiber yarns to make latent bulkiness manifest, and to give substantial tension in a wet heat state including boiling water and / or a dry heat state of around 200 ° C. This is because it is a general method to perform heat treatment without using, and if at least one of the difference in boiling water shrinkage and the difference in dry heat shrinkage at 200 ° C. is less than 5%, it is difficult to impart good bulkiness and drapability to a woven or knitted fabric. . If the difference in boiling water shrinkage is too large, the surface of the woven or knitted material is likely to be rough and rough, so that the difference in boiling water shrinkage is preferably 20% or less, more preferably 15% or less. If the heat shrinkage ratio of the high shrinkage yarn is too large, the resulting woven or knitted product is likely to become coarse and hard. Therefore, the boiling water shrinkage ratio is preferably 20% or less, and the 200 ° C. dry heat shrinkage ratio is preferably 35% or less.

Here, in the present invention, at least two kinds of polyesters having different melting points are used in order to impart a difference in heat shrinkage. The melting point difference is preferably 10 ° C or more in order to make at least one of the boiling water shrinkage difference and the 200 ° C dry heat shrinkage difference 5% or more, and the melting point difference is 15 ° C or more to be 7% or more.
It is preferable to have the above. If the melting point difference is larger than 30 ° C., the spinnability on the low melting point side tends to deteriorate at the same spinning temperature, and the melting point difference is more preferably within 25 ° C.

The polyester forming the heat shrinkage differential mixed yarn of the present invention is not particularly limited, but a polyester having 80 mol% or more of polyethylene terephthalate can be preferably used as a polyester suitable for a high-grade silky material. A preferable combination is that polyethylene terephthalate is used as the high melting point polymer and polyethylene terephthalate obtained by copolymerizing a third component such as phthalic acid or isophthalic acid is used as the low melting point polymer. When polyethylene terephthalate obtained by copolymerizing the third component with a low-melting point polymer is used, slack is easily generated in the yarn formed of the low-melting point polymer in the heat shrinkage difference mixed fiber obtained. In order to prevent this, it is preferable that the low-viscosity polymer has an intrinsic viscosity equal to or higher than that of the high-melting polymer, more preferably 0.01 or more, and the intrinsic viscosity in 25 ° C. orthochlorophenol is more preferably 0.01 or more.
It is more preferable to make it larger than 02.

For a high-class silky woven or knitted fabric, the cross-sectional shape of the yarn constituting the heat shrinkage-differential mixed yarn is preferably T-shaped, Y-shaped or the like.

The present invention will be described in detail below step by step with reference to the drawings. First
The figure is a schematic view of a direct spinning and drawing apparatus showing an example of an embodiment of the present invention. Two kinds of polyesters having different melting points are melted and discharged from the spinneret 1 to form a mixed filament undrawn yarn of a high melting point polyester thread 2 and a low melting point polyester thread 3. High-melting point polyester and low-melting point polyester can be discharged from different spinnerets to form a splicing yarn, but it is preferable to discharge from a single spinneret from the viewpoint that they do not become mixed fiber yarns.
In particular, when low-melting point polyester is discharged from the center part of one die and high-melting point polyester is discharged from the outer peripheral part, a low-melting point yarn becomes a high-shrinkage ratio yarn when the difference in the shrinkage ratio of the wound yarn It is more preferable that the polyester yarn is shrunk in the central portion of the mixed fiber and the high melting point polyester yarn having a low shrinkage ratio becomes sagging in the outer peripheral portion of the mixed yarn to further exhibit the shrinkage difference effect. The undrawn yarn yarn discharged from the die 1 is cooled and solidified by the cooling device 4, and then a predetermined oil agent is applied to the yarn while focusing the undrawn yarn yarn by the oil supply device 5 provided within 3 m. Then, the first godet roller 6 which is not heated and has a mirror finish finishes it at a speed of 4000 m / min or more, and then guides it to the second godet roller 7, where the first godet roller 6
The second godet roller 7 and the second godet roller 7 are stretched by the peripheral speed difference between the rollers, and the winding machine 8 obtains the package 9. If necessary, a focusing nozzle may be provided in front of the winder.

The greatest feature of the direct spinning and drawing method of the present invention is that the first godet roller is not heated and is mirror-finished as in the conventional method. That is, in the present invention, since the first godet roller is kept at room temperature (room temperature) and the preheating is not performed, the yarn tension on the roller is not lowered, and the yarn fluctuation on the first and second godet rollers is very small. The yarn breakage due to the contact between the yarns is greatly reduced and the productivity is improved.

In addition, since the orientation advances to a certain extent and the shrinkage rate decreases when the take-up speed is set to 4000 m / min or more, the heat setting temperature can be lowered even when heat setting treatment is carried out after stretching, and the electric heating cost is greatly reduced. can do. Further, by mirror-finishing the first godet roller, it is possible to prevent the yarn from slipping, so that the spinnability is stabilized.

The first godet roller 6 is a roller that can rotate at high speed and is 3000 m /
It suffices that a peripheral speed of not less than a minute can be obtained, and a heater is not necessary because of a short roller. It is necessary to accurately control the undrawn yarn at a speed of 4000 m / min or more by the roller and take it up. Therefore, the driven type or forced drive type separate roller 6 '
The yarn may be flexed around the first godet roller and the separate roller one or more times by using, but since the surface of the first godet roller is mirror-finished, the yarn can be reliably gripped, The take-up speed can be restricted by winding the first godet roller once or less without passing through the separate roller 6 '.

By adopting such a condition of surrounding the first godet roller, it is not necessary to use the long heating type first godet roller of the conventional method, and the number of windings is small, so that the equipment cost can be very compact and inexpensive. In addition, since the first godet roller is not heated, the yarn shake on the roller is greatly reduced, which has the effect of enabling high-speed take-up.

In the present invention, before the yarn is taken up by the first godet roller 6, it is necessary to refuel with the refueling device 5 while concentrating within 3 m below the spinneret surface. The yarn is focused because the take-up speed of the first godet roller reaches 4000 m / min or more, the air flow associated with the yarn increases extremely, and the yarn tension increases, resulting in non-uniform yarn orientation. This is to prevent yarn breakage and abnormal yarn quality. This oil supply device 5 is effective because the degree of the accompanying airflow is smaller as it gets closer to the mouthpiece surface, but it is not preferable to place it before the solidification point because it gets too close to the mouthpiece. As a proper position, it is important to place it within 3 m below the surface of the die immediately after solidification. Place the refueling device below the base
If it is larger than 3 m, as described above, the air flow associated with the yarn increases at an accelerated rate to cause yarn breakage or uneven yarn quality.

As a focusing method, an oiling guide that also serves as a focusing guide is most preferable, but another guide may be provided immediately after the oiling device to focus.

In the present invention, stretching between the first godet roller and the second godet roller is important for imparting mechanical properties that can withstand practical use. In this case, dry heat or a steam atmosphere can be passed between the first godet roller and the second godet roller as needed so that the stretching tension does not become excessive.

On the other hand, in the present invention, when the yarn is directly wound from the second godet roller 7 to the winder 8, the second godet roller 7
It is preferable to make the surface satinized. This is advantageous for preventing the yarn winding around the second godet roller 7 and stabilizing the process tension. Therefore, it is preferable that the surface roughness of the second godet roller 7 be in the range of Hrms 40 to 70. If the surface roughness exceeds Hrms70, the yarn deviation on the second godet roller becomes large and the yarn breakage tends to occur easily. Also Hrms
If it is less than 40, yarn winding around the roller is likely to occur, which is disadvantageous in operation. By making the surface of the second godet roller satinized, the regulation of the drawing speed becomes a little unstable. Therefore, using a separate roller 7'paired with the second godet roller, the yarn is squeezed once or more on both rollers. Surrounding is desirable. From the viewpoint of controlling the stretching speed, it is preferably 3
It is better to surround the area more than once.

When the yarn is not wound directly from the second godet roller 7, the surface of the second godet roller can be mirror-finished so that the yarn can be reliably gripped as in the case of the first godet roller.

If necessary, the second godet roller can be heated, or the stretched mixed fiber can be heat set by a heat treatment device such as dry heat or steam heating. It is preferable to heat the second godet roller to 100 ° C. or higher in order to reduce the boiling water shrinkage rate of the obtained mixed fiber to 20% or less. However, if the second godet roller is heated to 160 ° C. or higher, the yarn wiggle on the second godet roller becomes large and the yarn breaks easily, so the temperature is preferably lower than 160 ° C.

In the present invention, the yarns that have been bundled and supplied with oil are taken up by the first godet roller at a take-up speed of 4000 m / min or more. If the take-up speed is less than 4000 m / min, the structure of the yarn is an undrawn region, and if the drawing is performed without heating the first godet roller (above the glass transition temperature), Wooster unevenness increases. That is, in the present invention, the take-up speed is set to 4000 m / min or more, preferably 4500 m / min or more, and more preferably 5000 m / min or more to make the yarn structure before drawing as close as possible to the drawn yarn structure. However, if the take-up speed exceeds 6000 m / min, the heat shrinkage rate decreases, so it is preferably 6000 m / min or less, and more preferably 5500 m / min or less.

The elongation level of the mixed fiber can be freely selected within the range of 20 to 45% which is the elongation level of a normal polyester drawing system by changing the drawing ratio applied between the first and second godet rollers. It is also possible to mix the fineness of the filaments that make up the mixed fiber, in which case the high shrinkage yarn side is thicker,
It is preferable that the low shrinkage yarn side has a fineness. In particular, it is preferable that the fineness side is 1.8 to 5 denier and the fineness side is 0.7 to 3 denier, and a fineness difference of 0.7 denier or more is provided, since a soft texture can be imparted to the woven or knitted fabric.

[Effects of the Invention] According to the present invention, a heat shrinkage difference mixed fiber can be efficiently and stably manufactured by a direct spinning and drawing method in a compact apparatus. By using the heat shrinkage differential mixed yarn obtained in the present invention as a woven or knitted product and subjecting it to heat treatment with moist heat and / or dry heat without giving substantial tension, it is possible to impart bulkiness and drapeability.

[Examples] The present invention will be described in detail below with reference to Examples. First, a method of measuring the boiling water shrinkage ratio and the 200 ° C dry heat shrinkage ratio in the present invention will be described below.

A. Boiling water shrinkage The sample is a skein machine with a circumference of 1 m and 10 turns, and the original length L ₁ is determined under a load of 0.1 g / d. Next, after treating for 15 minutes in boiling water under no load, the length L ₂ after treatment under a load of 0.1 g / d
Is calculated by the following formula. This is measured 5 times for each sample, and the average value is taken as the boiling water shrinkage rate.

Shrinkage rate of boiling water = (L ₁ −L ₂ ) / L ₁ × 100 (%) B.200 ° C dry heat shrinkage rate 0.1g / d for a sample with a skein machine with a circumference of 1m and 10 windings Determine the original length L ₃ under load. Next, after treating for 15 minutes in a dry heat atmosphere of 200 ± 2 ° C under a load of 2 mg / d, 0.1 g /
Calculate the length L ₄ after processing under load in d and calculate from the following formula.
This is measured 5 times for each sample, and the average value is taken as the 200 ° C. dry heat shrinkage ratio.

200 ° C. dry heat shrinkage = (L ₃ −L ₄ ) / L ₃ × 100 (%) Example 1, Comparative Examples 1 to 3 As a high melting point polyester, the intrinsic viscosity in 25 ° C. orthochlorophenol is 0.65 and the melting point is Polyethylene terephthalate at 259 ° C is used, and 25 ° C as low melting point polyester
Intrinsic viscosity in orthochlorophenol is 0.68 and melting point is 23
An ethylene terephthalate / ethylene isophthalate (90/10 mol) copolyester at 7 ° C. was used. The high melting point polyester is melted and discharged from the 28 Y hole discharge holes in the outer circumference array of the spinneret and the low melting point polyester is melted and discharged from the 16 Y hole discharge holes in the inner circumference array of the spinneret at a spinning temperature of 290 ° C., respectively, and the apparatus shown in FIG. Was directly drawn and drawn. The filaments melted and discharged were cooled, oil was applied at 1.0% by weight, and then the conditions of the first godet roller (1st GR) and the second godet roller (2nd GR), which were mirror-finished, and the lubrication position were changed as shown in Table 1. After being drawn, a mixed yarn of low shrinkage yarn 40 denier 28 filament formed of high melting point polyester and high shrinkage yarn 35 denier 16 filament formed of low melting point polyester was obtained. However, the number of windings on the first godet roller is 4 and the number of windings on Hrms50 of the satin second godet roller is 5.
The winding was performed and the room temperature was 30 ° C. Table 1 also shows the yarn characteristics and operability of the obtained drawn mixed fiber yarn. The elongation of all the drawn mixed filament yarns was within the range of 36 to 40%.

The resulting heat shrinkage difference mixed yarn is passed through a weft to make a double layer, relaxed for 5 minutes under boiling water, and 200 for relaxed state.
Drying heat treatment was carried out at 5 ° C for 5 minutes, and 25% weight loss treatment was carried out with a 3% sodium hydroxide aqueous solution at 100 ° C, and then ordinary polyester dyeing was performed.

Experiments Nos. 1 to 6 show the effect of spinning speed, and in Experiment No. 1 which is Comparative Example 1, Wooster spots were abnormally large and uneven stains on the fiber were conspicuous. In No. 2, Wooster spots were slightly large, and there was some conspicuous uneven dyeing even with fine materials. The No. 2 to No. 5 fibers were excellent in bulkiness and drape, were soft and elastic, and had good dyeing uniformity. The No. 6 fiber was slightly lacking in bulkiness and drapability, and the heat shrinkage difference fiber mixing effect was small as compared with Nos. 2 to 5.

No. 7 of Comparative Example 2 is a product in which the first godet roller is heated and has no problem in terms of yarn characteristics, but the yarn wanders on the first godet roller is large, and winding or yarn breakage occurs, which is a problem in operation. And there was a problem that electric heating cost and equipment cost were large.

No. 8 which is Comparative Example 3 has a long distance to the refueling position, an increase in the accompanying airflow, a slightly large Wooster spot, and winding or thread breakage around the first and second godet rollers occurs. There was a problem.

Comparative Example 4 Spinning, drawing and blending were performed under the same conditions as in Experiment No. 4 of Example 1 except that a godet roller subjected to a satin finish of Hrms50 was used as the first godet roller. The stretched mixed fiber thus obtained had large yarn spots caused by slip on the first godet roller, and had a poor Worcester spot U% value of 1.75.

[Example 2] The roller surface of the second godet roller was mirror-finished, and the mixed fiber was obtained through the third godet roller.
Other conditions were the same as those for NO4 in Example 1.

The obtained drawn mixed fiber yarn had a U% of 0.60 and had no problem, and the yarn was not wound around the second godet roller. "

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a direct spinning and drawing apparatus showing an example of an embodiment of the present invention. 1: Clasp 2: High melting point polyester thread 3: Low melting point polyester thread 4: Cooling device 5: Oil supply device 6: First godet roller 6 ': Separate roller 7: Second godet roller 7': Separate roller 8: Winding machine 9: Package

Continuation of front page (56) Reference JP-A-59-82434 (JP, A) JP-A-57-95329 (JP, A) JP-B-51-30620 (JP, B2) JP-B-56-5841 (JP , B2)

Claims (1)

[Claims] 1. At least two polyesters having different melting points are melted and discharged from different discharge ports, and after cooling and solidifying,
Lubricating while concentrating the yarn within 3 m below the spinneret, without heating,
A method for producing a polyester heat-shrink differential blended yarn, which comprises drawing with a mirror-finished first godet roller at a rate of 4000 m / min or more and subsequently drawing between the first godet roller and the second godet roller.