JPS5831114A - Production of polyester yarn for hard twisting - Google Patents

Abstract

PURPOSE:A composition consisting of polyethylene terephthalate and polytrimethylene terephthalate or the like is melt extruded into fiber, heat treated and wound up at a high speed to produce the titled yarn that has specific fineness, break elongation and boiling water shrinkage, thus showing good creping properties. CONSTITUTION:A polyester composition consisting of 20-90wt% polyethylene terephthalate (C2T) and 80-10wt% polytrimethylene terephthalate (C3T) and/or polytetramethylene terephthalate (C4T), which is obtained by copolymerization or blending, is melt extruded into fibers, solidified by cooling, heat treated with heated rollers 1, 2, 3, then wound up around the winder W as a multifilament yarn of 2.2 or less denier filament fineness, less than 60% elongation at break, less than 7% boiling water shrinkage, to give the objective fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a method for producing a polyester yarn, more particularly a high twist polyester yarn having a highly grained bamboo.

When producing polyester strongly twisted carpet knitted fabrics, the highly twisted yarns are usually twisted and fixed at high temperatures (twist set) to facilitate the handling of yarn in the weaving and knitting process or similar processes. be. However, such temporary exchange and fixation treatment at high temperatures is limited to polyester 4#74.
By thermally deforming the fiber structure and reducing the graininess, L-:
Therefore, it was difficult to obtain a textured material of satisfactory quality.

In particular, when attempting to weave polyester highly twisted yarn in a highly productive water jet loom, a higher degree of twist fixation is required compared to weaving with a general shuttle machine. Since the twisting and setting process is carried out at a high temperature corresponding to E, the thermal curvature of the fiber structure becomes significant, and it is almost impossible to obtain the desired texture.
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The purpose of the present invention is to solve the above-mentioned problems, and is capable of sufficiently fixing the twist even though it is twisted and set at a low temperature, and moreover, when it is made into a woven or knitted fabric. ,
To provide a method for consistently producing a high-twist polyester yarn in which the graininess and grain quality are better than those of conventional polyester in one spinning step.

According to the invention polyethylene terephthalate (C,T)
is copolymerized or/and blended in a proportion of 20 to 90 wt% of the total amount, and polytrimethylene terephthalate (CAT) or/and polytetramethylene terephthalate (C, T) in a proportion of 80 to 10 wt% of the total amount. The polyester composition is melted and discharged, and after cooling, it is heat-treated using at least one heating roller at a speed of asoom/min or more, so that the single yarn fineness is 2.2 de or less, the cutting elongation is 60 modulus or less,
Provided is a method for producing a strong polyester yarn, which is characterized in that it is wound as a multifilament having a water shrinkage rate of 7 inches or less.

An important condition in the polyester composition of the present invention is the above-mentioned C-T and CsT, or C, T and C4T, or CIT and C
The point is that polyalkylene terephthalates such as sT and CaT (or polyalkylene terephthalates with different carbon numbers in the gryfur component) are combined with each other as a 7+, /nd or /'' compound.

Since these polyalkylene terephthalates have similar chemical structures, the polymers have good compatibility with each other, and in general, they can be mixed in any ratio to form yarn. However, in the present invention, ink that accounts for 20 to 9 wt% of the total y of the CAT is essential.C7T
If 1 is less than 2 wt%, the texture of the grained fabric tends to deteriorate; on the contrary! If it exceeds l + l wt%, the low-temperature set ratio that is the objective of the present invention is lost, and furthermore, for cs'r or 2 and C4T, the
It is essential that it is between 0 and IOwt%. If the amount exceeds 80 wt%, the texture of the grained fabric will have a strong rubber-like feel (not only will the texture be unsatisfactory, but the twist fixation will also be poor).
Do 1. On the other hand, if the content is less than 10 wt%, both the transferability in the lagoon and the grain development after making into a woven or knitted product are insufficient.

Furthermore, the polyester yarn of the present invention must have a breaking elongation of 60 inches or less and a water solution shrinkage rate of 7% or less. If the cutting elongation exceeds 6.0%, the handling of the yarn during the gauze knitting process and its preparation process will be poor. Also, the elongation is 6
If the shrinkage rate exceeds 0% or the water shrinkage rate exceeds 7%, the fiber structure of the polyester yarn is not thermodynamically stable enough, so the structure cannot be changed during the strong twist-fixing process. Deformation and relaxation occur, and most of the original strength needed to create grain is lost.

The polyester yarn of the present invention has CxT or/and CsT or/and CaT as its main components, but it also contains polymers, low molecules or organic compounds for various purposes in a proportion of 5 wt% or less of the total amount. There is no problem even if the inorganic substances are blended and/or copolymerized.

Blending and/or copolymerization of polyalkylene terephthalates in the present invention may be carried out during the polymerization process, or may be carried out by once polymerizing each and then chip blending (-5= ester ladle distribution in the spinning process). (because a reaction occurs)
It can be achieved.

The polyester yarn as described above is prepared by normal bath melt spinning and winding.
It would also be possible to split the yarn into separate processes, such as stretching, heat treatment, and winding. However, f+, which completes the spinning of high-twist raw yarn only in the spinning process by high-speed spinning and direct spinning, is not suitable for weaving,
In addition to streamlining post-processing processes such as embossing, it is possible to create a skewer that significantly streamlines the yarn manufacturing stage.

There have been many reports on high-speed spinning-16 yarn of polyethylene prephthalate, and at a winding speed of 5000 to 6000 m/min, the cutting elongation of the wound yarn is about 60 inches. However, in the polyester composition used in the present invention, CsT or C4
The T molecular chains are more effectively stretched during the high-speed spinning process, resulting in a take-up speed M' of 4000-5000 m/min.
Also, the cutting elongation can be set to 60 mm. In particular, when the single fiber tying 11 is 2.2 ds or less, the cooling speed IQ' of the molten and discharged filament increases, and the effect of stretching the molecular chains due to friction with air is relatively high even in the case of solidified filament by cooling. Is it like 3 soom/minute because it increases in size? Elongation of 40-60 even at low spinning speed
It turns out that it can be used as a thread.

On the other hand, if the single fiber exceeds 2.2 de, not only the above-mentioned stretching effect will be reduced, but also the roughness and hardness will be strong due to the texture of the strong exclusion material, which is not preferable. In addition, the spinning speed is 3500Tn.
If it is less than Z, it is usually difficult to suppress the cutting elongation of the wound yarn to 60% or less.

After the spun yarn is cooled and solidified, a small amount of
, c (it is necessary to use one heating roller to receive the hot part P11. If heat treatment is not performed, crystal formation in the spun yarn will be insufficient and the winding will increase. The submersion shrinkage rate of the yarn exceeds 7%, and as a result, the grain development as a highly twisted yarn becomes poor.

The surface N degree of the heating roller, the contact time with the yarn is the winding speed,
It varies depending on the desired grained fabric quality, but generally 18
The temperature is preferably 0° C. (preferably 200° C.) or higher and 001 seconds (preferably 003 seconds) or higher.

This hot part fil・12+, +4+1! There are various types of closing methods as shown in Fig. 1, but all of these are one of the p-ra f1f- placed between the oiling device (not shown) and the wine goo (W) during spinning. Or add #p-ra to J-so. In the figure, (b) rollers 2 and 3 are heated, and (c) rollers 1.4 are heated.Of course, the invention is limited to the heat treatment using only the heating rollers. For those with tc <, for example (
As shown in c), there is no problem with supplementary use of a slit heater or a plate heater 5 or other heating means.When the polyester yarn spun according to the present invention is made into a strong twist yarn as described above, it is completely different from conventional methods. Weaving using a water jet loom, which was previously impossible, becomes possible. Fourth, it has extremely excellent graining properties, which also makes it possible to create continuous grains on highly twisted gauze materials, which is completely impossible. This significantly reduces λ.

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

Example 1 Intrinsic viscosity [η) = 0.64, Tie as a matting agent
CtT containing o, o s wt% of s (dried at 160°C for 4 hours) and 04T (1
After drying at 20° C. for 6 hours) was blended in various proportions in the form of chips and melted at 285 to 295° C., it was discharged from a spinneret having 72 holes with a diameter of 03 and a round cross section.

Cooling, oiling L≦・, in the usual case of discharged yarn.
7 s de/722fi using the apparatus of Figure 1-A
/ was wound as a multifilament. At this time, the heating temperature of the heating p-ra was 200°C, and the number of windings around the yarn Kaso and 1-ra was 12 turns.

Table m1 speed was 4oooTn/min.

Next, the number of twists S is
The yarn was twisted at 2,500 T/M and set at 90° C. using a steam setter. Table 1 shows the fiber physical properties, the residual torque after twist-stopping, and the torque developed by wastewater treatment for these spun wound yarns and highly twisted yarns.

However, drainage shrinkage rate: Shrinkage rate when soaked in boiling water for 15 minutes in a free state (untwisted after twisting)・Lux: 4 to 11-0 Strongly twisted yarn after setting to 4t and 100 side The number of double twists (T150α) generated by applying a load of 2~/d eθ) to the center and both ends (T150α) Drainage development untwisting torque: Holding the strongly twisted yarn after twisting and setting TOO> Increase in central part K 2 kk? /de load is applied, both ends are combined during drainage, and the number of double twists generated at this time (T150) is 10- As can be seen from Table 1, No. 1fi, in the case of AI, 2, CsT100
% or even if C4T is included, it is too small,
The elongation of the spun yarn becomes high, and the decombustion torque after the highly twisted yarn is set is also large, resulting in extremely poor handling in the weaving process and other processes.

Conversely, in A7.8, it is C4T100chi or C
Even if dew T is contained, it is in a small amount, so the high elasticity of C4T cannot be suppressed, and the residual torque after twist setting becomes high, resulting in poor weaving properties.

On the other hand, J of A3 to 6 (9 go, spun winding 1 ~ thread relationship is small, twisting cellar), the residual torque after is also small,
The removal rate in post-processing is much better.

At this time, the drainage contraction rate is slightly increased by >s-J, but the drainage torque is only slightly reduced.

Example 2 The highly twisted yarn of Example I was used as the weft yarn, and the lI7 yarn had a root C.
! Nissan WJ LW-41 (Ir!1
Table 2 shows the results of the woven fabric 1, which was woven using a rotation speed of 36 orpm), and the woven fabric was scoured with a weak alkali and then embossed using a rotary washer (boil x 20 minutes).

Dake Weaving property × × Unable to weave △ Weaving is possible × Poor weaving property ○ Good * Urn texture ○ Good ◎ Very good. In the case of the present invention (43 to 6), it is possible to weave in a water jet loom. The texture is also white.

Example 3 C-T and C4T of implementation f+11 are divided by 70% to 30
The mixture was blended and melt-spun under the same conditions as in Example 1. In this case, the speed of the heating p-ra and winding machine is set to 1ooo
Changed in the range of +71/min to 6ooorn/min. Table 3 shows the elongation of the substitute yarn of the spinning winding J at this time.

Table 3 As can be seen from Table 3, in the case of A1.2, the winding speed is low, so the cutting elongation is large (which makes it difficult to handle the yarn in the post-processing process. In this case, the cutting elongation is lower than 6 oqA (and there is no problem with the upper %).

14- Example 4 C of Example 1! T and C4T were blended at a ratio of 70 tl) to 30 tl and melt-spun in the same manner as in Example 1 to obtain a mu. In this case, the discharge amount was changed in various ways.

Multifilaments with different l·-tal de were used.

The spinning volume Jll/yarn elongation at this time is shown in Figure 4.

In the fourth aspect 1, since the yarn tenier is dog, the cutting elongation of the winding yarn is high. On the other hand, at bends 2 to 5, the elongation is lower than 60 inches, and there is no particular problem in handling in the post-processing process.

Example 5 CyT and C4T of Example 1 were blended at a ratio of 704-:(0φ) and melt-spun in the same manner as Example 1. In this case, the temperature setting of the heating roller was changed in the range of room temperature to 230°C. Table 5 shows the elongation and water production shrinkage of the spun yarn.

Table 5 In this example, heating roller set temperature 1 (1' is 180°C
In the above process, the polyester yarn 111 having the delicate physical properties of the present invention is leaked for the first time.

Example 6 Intrinsic viscosity [η) −o, 64, Ti1 as a matting agent
C containing o, o s wt% of t! C5T (1
(dried at 20° C. for 6 hours) were blended in various proportions in the form of chips, and in the same manner as in Example 1 were made into raw yarns and highly twisted yarns. Table 6 shows the physical properties of the raw yarn (wound yarn) and the residual torque and water production torque after twist setting of the 1 strongly twisted yarn.

171 In the case of the present invention (parts 3 to 6), the residual torque after twisting is low. The amount of water produced by water treatment is quite high.
The texture is also excellent.

[Brief explanation of drawings]

Figure 1 (al (c) is a side view showing an example of the heating device d used for heating according to the invention. 1.2.3.4...・Heating roller 5 ・
・・・・・・・・・・・・0... Divinely assisted heating means W...
・・・・・・・・・・・・ Winder 18- (戊)(b) u/LN (Q) / W

Claims (1)

[Claims] fi+ polyethylene tereph clay) (C!T)
A polyester composition obtained by copolymerizing or/and blending polytrimethylene terephthalate (C1T) or/' and polytetramethylene terephthalate (C4T) in a proportion of 80 to 10 wt% of the total amount of b''k. The material is melted and discharged as a filament, further cooled and solidified, and then heat treated with a heating roller, and then 3500/
Polyester raw yarn for strength, characterized by being wound as a multifilament with a single fiber fineness of 2-2 de or less, a cutting elongation of 60 inches or less, and a boiling water yield of 7 inches or less, at a speed of 1 minute or more. manufacturing method.