JPH0147574B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a bulky polyester filament yarn. (Prior art) As a method of imparting bulk to filament yarns, it is conventional to mix filaments with different shrinkage rates and heat them in the dyeing and finishing process after weaving to create a difference in shrinkage and increase bulk. It is commonly practiced. However, this method relies on the natural contraction force of the filament during the dyeing and finishing process, so there is a limit to its bulkiness, and it has the disadvantage that it cannot be expected to obtain a material with great bulkiness. On the other hand, a method has been proposed in which a mixed fiber yarn exhibiting high bulkiness is obtained by utilizing the difference in elasticity between filaments rather than the difference in shrinkage between the filaments. (Refer to Japanese Patent Application Laid-open No. 140130/1983). Although the differential elasticity mixed fiber yarn obtained by this method is a bulky yarn that exhibits greater bulkiness than the differential shrinkage mixed yarn, fabrics using this bulky yarn still lack swell and have a hard feel. It was something that was happening. (Object of the Invention) An object of the present invention is to provide a bulky yarn from which a fabric exhibiting sufficient swelling and soft feel can be obtained. (Structure of the Invention) In order to achieve the above object, the present inventors believe that if the filaments constituting the core of the intertwined mixed yarn can develop crimp, the difference in yarn length from other filaments can be reduced. As a result of repeated studies, we thought that it would be possible to make the product even larger than it appears, giving it high bulkiness and a flexible feel, and as a result, we decided to use polybutylene terephthalate polymer and polyethylene tenurephthalate polymer. An undrawn filament yarn (hereinafter sometimes referred to as PBT/PET undrawn filament yarn) consisting of a conjugated filament in which a combined filament is combined in a side-by-side manner;
An undrawn filament yarn (hereinafter sometimes referred to as PET undrawn filament yarn), which is composed of a filament made of a polyethylene terephthalate polymer with a maximum draw ratio larger than that of the PBT/PET undrawn filament yarn, is simultaneously drawn and We have discovered that by performing a fiber blending process, it is possible to arrange the former filaments in a crimped state in the core of the resulting blended fiber yarn (hereinafter sometimes referred to as drawn filament yarn), and have arrived at the present invention. did. That is, the present invention provides a mixed fiber yarn consisting of two or more types of polyester filament yarns, in which entangled portions exist intermittently in the longitudinal direction of the mixed fiber yarn, and the core of the yarn mainly contains polybutylene terephthalate. It is a polyester bulky yarn characterized by composite filaments in which the coalescence and polyethylene terephthalate polymer are arranged in a side-by-side type or an eccentric sheath core type in a crimped state, and the maximum draw ratios are different from each other. When a plurality of undrawn filament yarns are combined and drawn and heat set, a polybutylene terephthalate polymer and a polyethylene terephthalate polymer are combined into a side-by-side type or an eccentric sheath core type as the component with the lower maximum stretching ratio. Using an undrawn filament yarn consisting of filaments that are
This is a method for producing a polyester bulky yarn, which is characterized by heat setting and intermittently intertwining the two or more types of undrawn filament yarns in the longitudinal direction before or after stretching. The invention will be further explained with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of manufacturing the polyester bulky yarn of the present invention, FIG. 2 is a bulky measuring device for bulky yarn, and FIG. 3 is an enlarged surface measurement view of the polyester bulky yarn of the present invention. . In FIG. 3, 10 is a filament that mainly constitutes the core of the bulky yarn, 11 is a filament that is mainly the outside of the bulky yarn, and 12 is an intertwined portion. In such a bulky yarn, the filament 10 that mainly constitutes the core is a crimped PBT/PET conjugate filament in which a polybutylene terephthalate polymer and a polyethylene terephthalate polymer are arranged in a side-by-side type or an eccentric sheath core type. It is important that the bulky yarn is in the developed state and that the intertwined portion 12 exists in the longitudinal direction of the bulky yarn. Here, if the filament 10 is made of polyethylene terephthalate polymer or polybutylene terephthalate polymer alone, the filament 10 will not be in a crimped state, so the apparent thread length difference between the filament 11 and the filament 11 will be reduced. It is difficult to provide sufficient bulk and a soft feel to the touch. As for the composite form of the bulky filament yarn 10 of the present invention, the side-by-side type is preferable because it has a greater crimp development force than the eccentric sheath core type. Further, if the intertwined portions 12 do not exist in the longitudinal direction of the bulky yarn, the filaments 10 and 11 will separate due to the development of crimp in the filaments 10, making it difficult to impart bulkiness. The number of intertwined parts 12 is preferably 40 to 80 per m. If the number of interlaced parts 12 is less than 40 pieces/m,
The filaments constituting the bulky yarn tend to separate, and when the number exceeds 80 filaments/m, the apparent difference in yarn length between filaments 10 and 11 tends to be insufficient. The method for manufacturing the polyester bulky yarn of the present invention described above will be explained using FIG. 1. In FIG. 1, a PBT/PET undrawn filament yarn 1 and a PET undrawn filament yarn 2 are combined by a guide 3 and then fed to a hot roller 4. Next, the hot roller 4 and the stretching roller 6
After stretching with a hot plate 5 and heat setting with a hot plate 5, an interlacing treatment is performed with an interlace nozzle 7, and then the film is wound up with a winding device 8. In this manufacturing method, the maximum draw ratio of the PBT/PET undrawn filament yarn 1 is lower than that of the PET undrawn filament yarn 2, and the drawing/heating is carried out at a draw ratio lower than the maximum draw ratio of the PBT/PET undrawn filament yarn 1. It is important to set and provide entanglement either before or after drawing. Here, PBT/PET undrawn filament yarn 1
In the case of undrawn filament yarns made of polybutylene terephthalate polymer or polyethylene terephthalate polymer alone, such undrawn filament yarns cannot develop crimp after drawing and heat setting, so the drawn filament yarns obtained are The fabric used lacks bulk and soft touch. The composite form of the filaments constituting the PBT/PET undrawn filament yarn used in the present invention may be a side-by-side type or an eccentric sheath core type, but the side-by-side type is preferable because it has a large crimp-producing force. In order to spin such PBT/PET undrawn filament yarn, conventionally known spinnerets are used, such as those described in Japanese Patent Publication No. 43-19108, Japanese Patent Publication No. 41-16125, and Japanese Utility Model Publication No. 42-19536. The fiber can be easily spun by melt spinning using a spinneret. Particularly, in order to form a side-by-side type, it is preferable to use a spinneret in which both polymers are bonded directly under the spinneret immediately after discharge, as described in Japanese Utility Model Publication No. 19536/1983, since stable spinning can be achieved. At this time, the weight ratio of polybutylene terephthalate, polymer, and polyethylene terephthalate polymer in the composite filament is set at 20 to 50% in consideration of spinning stability.
%, preferably 30 to 40%, and the polyethylene terephthalate polymer to 80 to 50%, preferably 60 to 70%. The intrinsic viscosity of the polyethylene terephthalate polymer at this time is preferably 0.35 to 0.55,
If it is less than 0.35, spinnability tends to deteriorate;
On the other hand, if it exceeds 0.55, it becomes difficult to create a sufficient difference in intrinsic viscosity from the polybutylene terephthalate polymer, and the ability to develop crimp after drawing of the PBT/PET undrawn filament yarn tends to decrease. The spinning speed in such composite spinning should be 2000 m/min or more, especially 2500 m/min or more, since PBT/
It is preferable because the crimp development force after drawing the PET undrawn filament yarn can be increased. In the production method of the present invention, when the maximum draw ratio of the PBT/PET undrawn filament yarn 1 is made higher than that of the PET undrawn filament yarn 2, and the draw ratio is lower than the maximum draw ratio of the PET undrawn filament yarn 2, Because the characteristics of both polymers forming the PBT/PET conjugate filament described below cannot be fully demonstrated, PBT/PET
It is not possible to cause the PET undrawn filament yarn 1 to develop sufficient crimp after drawing. In order to make the maximum drawing ratio of the PBT/PET undrawn filament yarn lower than that of the PET undrawn filament yarn as in the present invention, the spinning speed of the PET undrawn filament yarn must be lower than the spinning speed of the PBT/PET undrawn filament yarn during spinning. This can be easily achieved by increasing the speed. PET at this time
The spinning speed of the undrawn filament yarn was as described above.
In view of the spinning speed of the PBT/PET undrawn filament yarn, the spinning speed is preferably 2000 m/min or less, particularly 1500 m/min or more. In the present invention, the above-mentioned PBT/PET undrawn filament yarn and PET undrawn filament yarn are drawn and heat set at the same time, but if heat setting is not performed here, PBT/PET undrawn filament yarn is formed. Therefore, the PBT/PET undrawn filament yarn does not exhibit sufficient crimp development after drawing. As the stretching/heat setting conditions of the present invention, the stretching temperature is defined by the temperature T _D of the hot roller 4 shown in FIG. This T _D preferably satisfies Tg≦ _TD ≦140°C. Here, Tg indicates the glass transition point of polyethylene terephthalate polymer, and is approximately
The temperature is 70℃. If T _D is less than Tg, the stretching stability tends to be impaired, and if T _D exceeds 140°C, fusion may occur on the hot roller 4, which deteriorates the stretching stability. At the same time, the drawn filament yarn obtained also tends to have a hard texture.The T _D is particularly preferably 80°C≦ _TD ≦135°C, and most preferably 80°C≦ _TD ≦95°C. . In addition, the closer the draw ratio DR is to the maximum draw ratio (DRPBT/PET) of the PBT/PET undrawn filament yarn, the more crimping after drawing of the PBT/PET undrawn filament yarn will occur, which is preferable, but the drawing ratio will be stable. In consideration of gender, set DR to 0.65×DR _PBT/PET ≦DR≦
It is preferable to set it as 0.8×DR _PBT/PET . Here, if DR<0.65×DR _PBT/PET , the occurrence of crimp after drawing of PBT/PET undrawn filament yarn tends to decrease, and the bulkiness of the obtained drawn filament yarn tends to decrease, and DR> If it is 0.8×DR _PBT/PET ,
Yarn breakage occurs and stretching stability is impaired. Furthermore, the temperature at the time of heat setting, that is, the temperature (Hset) of the hot plate 5 in FIG. 1 is 140°C≦Hset≦200.
℃ is preferred, particularly 160℃≦Hset≦190℃. If Hset is less than 140°C, the resulting drawn filament yarn will have a high heat shrinkage rate, so bulkiness tends to be lost during scouring and dyeing. /PET
Since fusion of the conjugate filament and/or the polyethylene terephthalate filament may occur, the bulkiness of the resulting drawn filament yarn tends to be impaired. Moreover, if entanglement is not imparted after or before drawing as in the present invention, PBT/PET in the drawn filament yarn exiting the drawing roller 6 in FIG.
Since the conjugate filament has already partially crimped, it easily wraps around the drawing roller 6, and the constituent filaments of the obtained drawn filament yarn separate, so that fabrics using such drawn filament yarn can be easily wrapped around the drawing roller 6. It lacks bulk and has a poor texture. Here, as the entanglement imparting device for imparting entanglement, any device may be used as long as it can impart entanglement between filaments, and commonly used interlace nozzles and Taslan nozzles are preferably used. Further, the number of entanglements to be applied is preferably 40 to 80 per meter, and the place where the entanglement is applied is preferably after stretching, since uniform stretching can be easily performed. Although the present invention is directed to polybutylene terephthalate polymers and polyethylene terephthalate polymers, these may be copolymerized with a third component at a ratio of 15 mol% or less, and both polymers may contain It may contain additives such as a dissipating agent, a coloring agent, a flame retardant, etc. Furthermore, the filament of the present invention may have any cross-sectional shape. (Function) Generally, when a polybutylene terephthalate polymer is in a relaxed state, the tetramethylene groups in its crystal part have a zigzag structure (referred to as α structure), which is a mechanically stable structure.
When tension is applied to a crystalline part, the tetramethylene groups of the crystalline part assume an extended structure (referred to as a β structure). And when the tension is removed again, β
Crystals that have adopted a structure have the property of returning to the α structure again. Dimensional changes are observed between such α and β structures [Macromolecules 9 , 266
(1976)]. When a PBT/PET conjugate filament consisting of a polybutylene terephthalate polymer having such a crystal modification and a polyethylene terephthalate polymer having no crystal modification is subjected to heat setting in an elongated state, the polyethylene terephthalate polymer crystallizes. While the shrinkage rate is extremely small,
Even if the polybutylene terephthalate polymer crystallizes, it can shrink due to crystal modification as described above, so crimp occurs when the PBT/PET undrawn filament is brought into a relaxed state after drawing and heat setting. In the present invention, in order to utilize such properties,
When drawing and heat setting the PBT/PET undrawn filament yarn at the same time as the other undrawn filament yarns by setting the maximum drawing ratio of the PBT/PET undrawn filament yarn lower than that of other undrawn filament yarns, the PBT/PET undrawn filament yarn is It is designed to be heat set in the stretched state. The drawn filament yarn of the present invention, in which such a PBT/PET undrawn filament yarn and other undrawn filament yarns are simultaneously drawn and heat set, and which is also intertwined, will be in a relaxed state after being stretched, and the PBT/PET The conduit filament develops crimp and enters the core of the drawn filament yarn.
Filaments made from other undrawn filament yarns do not appear to be crimp, so they appear to have a relatively longer length, but since the filaments are intertwined, the excess filament is removed. It sticks out. As a result, the crimped filaments in the drawn filament yarn core and the filaments protruding to the outside result in a bulky yarn that is extremely bulky and feels soft to the touch. (Effects of the Invention) The fabric obtained using the bulky yarn of the present invention has much more bulge and has a softer feel than fabrics using conventional mixed fiber yarns. The present invention will be further explained with reference to Examples. The bulkiness of the drawn filament yarn was measured by the following method. That is, the drawn filament yarn is passed through a spooling machine (circumference
A skein of 60,000 denier was made from 1.125 m), and the sample was folded in half. A load of 6 g was hung from one end of the sample, heat-treated at 180°C for 5 minutes, and then cooled. Next, this filament yarn is placed in a box (height 2.5 cm, width 1.0 cm, length 10 cm, radius of curvature of 0.5 cm on the bottom) as shown in Figure 2, and a lid (weight 6 g) is placed.
The volume Vcm ³ of a certain amount of weight Wg of filament yarn under the load of is calculated by the following formula. Bulky degree (cm ³ /g) = V/W Example Polyethylene terephthalate polymer with intrinsic viscosity 0.47 containing 0.25% titanium oxide and titanium oxide
Polybutylene terephthalate polymer containing 0.25% and having an intrinsic viscosity of 0.87 and 36 described in Utility Model Publication No. 42-19536
40 at a ratio of 50:50 using a nozzle with a discharge hole.
Discharge at g/min and spin at a spinning speed of 3000m/min.
A PBT/PET undrawn filament yarn was obtained. on the other hand,
A polyethylene terephthalate polymer containing 0.3% titanium oxide and having an intrinsic viscosity of 0.64 was spun at a spinning speed of 1300 m/min using a commercially available spinning machine to obtain an undrawn PET filament yarn of 150 denier 36 filaments. The undrawn filament yarn thus obtained was simultaneously drawn as shown in FIG. At this time, the temperature of the hot roller 4 was set to 85°C, the temperature of the hot plate 5 was set to 170°C, and the stretching ratio was set to the first
Stretching was carried out with various changes as shown in the table. After stretching, the pressure of the interlace nozzle 7 was adjusted to create interlaces such that the number of interlaces was 45/m. Next, the bulkiness of the obtained drawn filament yarn was measured, and the results are also shown in Table 1. The maximum stretching ratio of the PBT/PET undrawn filament yarn was 2.2.

[Table] When these drawn filament yarns were subjected to conventional scouring and dyeing into knitted fabrics, they all exhibited a swollen and soft texture. Comparative example A polyethylene terephthalate polymer containing 0.25% titanium oxide and having an intrinsic viscosity of 0.64 was discharged from a nozzle with 36 discharge holes at a rate of 40 g/min, and the spinning speed was 3000.
PET undrawn filament yarn was obtained by spinning at a speed of m/min. On the other hand, the intrinsic viscosity containing 0.3% titanium oxide
A PET undrawn filament yarn of 150 denier and 36 filaments was obtained by spinning at a spinning speed of 1300 m/min using a 0.64 polyethylene terephthalate polymer. The PET undrawn filament yarn thus obtained was doubled and drawn as shown in FIG. 1 at the same time as in the Examples. The bulkiness of the obtained drawn filament yarn was measured, and the results are also shown in Table 2. The maximum draw ratio of the PET undrawn filament yarn spun at a spinning speed of 3000 m/min was 2.2.

[Table] Next, when the obtained drawn filament yarn was knitted and subjected to usual scouring and dyeing, the result was a hard texture with little swelling.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing one embodiment of manufacturing the polyester bulky yarn of the present invention, Fig. 2 is a bulky measuring device for bulky yarn, A is a front view, B is a perspective view, and Fig. 3 is a FIG. 2 is an enlarged sectional view of the polyester bulky yarn of the present invention. In the figure, 1...PBT/PET undrawn filament yarn, 2...PET undrawn filament yarn,
3... Guide, 4... Hot roller, 5... Hot plate, 6... Stretching roller, 7... Interlace nozzle, 8... Winding device, 10... Filament mainly forming the core of the bulky yarn. 1
1... Filament that mainly constitutes the outside of the bulky yarn, 12... Intertwined portion.

Claims (1)

[Scope of Claims] 1. A mixed fiber yarn consisting of two or more types of polyester filament yarns, in which entangled portions exist intermittently in the longitudinal direction of the mixed fiber yarn, and the core of the yarn mainly contains polybutylene. A bulky polyester yarn characterized in that composite filaments in which a terephthalate polymer and a polyethylene terephthalate polymer are arranged in a side-by-side type or an eccentric sheath core type are arranged in a crimped state. 2. The polyester bulky yarn according to claim 1, wherein the composite filament is of a side-by-side type. 3. The polyester bulky yarn according to claim 1, wherein the number of entangled parts is 40 to 80 per meter. 4 When performing doubling drawing heat setting of two or more types of undrawn filament yarns having mutually different maximum drawing ratios,
Using an undrawn filament yarn consisting of a filament in which a polybutylene terephthalate polymer and a polyethylene terephthalate polymer are combined in a side-by-side type or an eccentric sheath core type as the component with the lower maximum stretching ratio, the maximum stretching ratio of this yarn is A method for producing a polyester bulky yarn, which comprises simultaneously stretching and heat setting at the following stretching ratios, and intermittently intertwining the two or more types of undrawn filament yarns in the longitudinal direction before or after stretching. . 5. The method for producing a bulky polyester yarn according to claim 4, wherein the composite filament is of a side-by-side type. 6. The method for producing a bulky polyester yarn according to claim 4, wherein the temperature during stretching is at least the glass transition point Tg of the polyester polymer and at most 140°C. 7. The method for producing a polyester bulky yarn according to claim 4, wherein the draw ratio is 0.65 to 0.8 of the maximum draw ratio of the undrawn filament yarn made of composite filaments. 8. The method for producing bulky polyester yarn according to claim 4, wherein the temperature during heat setting is 140 to 200°C. 9 Claim No. 4 in which entanglement is provided after stretching
A method for producing a polyester bulky yarn as described in Section 1. 10. The method for producing bulky polyester yarn according to claim 4 or 9, wherein the number of entanglements to be provided is 40 to 80 entanglements/m.