JPS6160171B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a crimped yarn for splitting by simultaneous stretching and false twisting. In recent years, when manufacturing crimped yarn, a method of false twisting synthetic fiber undrawn yarn at the same time as stretching (in-draw) has been widely adopted due to its excellent productivity. The crimped yarn obtained by In the field of so-called woolly fiber splitting, ordinary drawn yarns subjected to false twist processing are used exclusively. The present inventors have conducted intensive research to produce crimped yarn that can be industrially divided by simultaneous drawing and false twisting, and have found that The strip is bent by a guide, and after being stretched and false-twisted, the strip is twisted 2 to 6 times before winding.
% elongation improves fibrillation properties,
The present invention was achieved by discovering that fiber separation can be carried out industrially. That is, the present invention provides a method for producing a crimped yarn for splitting by simultaneously drawing and false-twisting an undrawn synthetic fiber multifilament yarn. This method is characterized by providing a bending guide, and using the guide to bend the yarn exiting the feed roller, and following stretching and false twisting, elongating the yarn by 2 to 6%, and then winding it. . Hereinafter, the present invention will be explained in detail with reference to the drawings. FIG. 1 is a schematic side view showing one embodiment of the present invention, in which 1 is an undrawn yarn package, 2a and 2b are yarn guiding guides, 3 is a feed roller, 4a and 4b are yarn bending guides, and 5 is a twist set. 6 is a false twisting means such as a false twisting spindle or a friction false twister; 7
a, 7b are yarn bending guides, 8 is a stretching delivery machine〓〓〓〓
9 is a stretching roller, 10a and 10b are yarn guiding guides, and 11 is a winding machine. In the figure, the undrawn multifilament yarn unwound from the undrawn yarn package 1 is stretched to a predetermined ratio between the feed roller 3 and the stretched delivery roller 8 and subjected to false twisting to become a crimped yarn. In the present invention, yarn bending guides 4a and 4b are provided between the feed roller 3 and the twist setting heater 5 to bend the yarn coming out of the feed roller 3 in a zigzag shape to give an appropriate stiffening. lead to. The yarn bending guides 4a, 4b are preferably fixed guides with a diameter of 5 to 15 mm, and preferably have a surface roughness of about 1 to 5S, but rotating guides may also be used. Moreover, although two yarn bending guides 4a, 4b are optimal, it is also possible to use one or three or more. Yarn bending guide 4
The yarn bending angle at a and 4b is the sum of angles θ ₁ and θ ₂ (θ ₁ +θ ₂ ) shown in FIG. 2, which is 60
The effect is particularly remarkable when the angle is in the range of ~180°. In the present invention, the yarn is bent by the yarn bending guides 4a and 4b, and the stretched delivery roller 8
1 to 8%, preferably 2%, at room temperature to the crimped yarn immediately after stretching and false twisting between the stretching roller 9 and the stretching roller 9.
Gives ~6% elongation. In a general two-heater type stretch/false twist processing device, a heater for relaxation heat treatment (second heater) and a take-up roller (second heater) and a take-up roller (second 2 delivery roller)
However, when such an apparatus is used, the above-mentioned elongation process can be performed without using the relaxation heat treatment heater and by changing the speed of the take-up roller. In this way, the yarn bending guides 4a and 4b bend the yarn exiting the feed roller 3, and the stretching delivery roller 8 and stretch roller 9
By applying elongation within the above range between the crimped yarn and the crimped yarn, the splitting property of the crimped yarn wound by the winder 11 is greatly improved. Although the reason for this is not yet clear, since the effect of improving fiber splitting properties is poor even if either of the above is absent, it is presumed that it is due to some synergistic effect due to the combination of the two. In the present invention, the yarn bending guides 7a, 7b are further provided between the false twisting means 6 and the stretching delivery roller 8.
is provided, and the yarns immediately after leaving the false twisting means 6 are totaled.
It is preferable to bend it in a zigzag manner in the range of 10 to 90 degrees to give a squeezing effect, since the above-mentioned effect is promoted. The yarn bending guides 7a and 7b are 2 as shown in the figure.
Alternatively, the yarn may be run diagonally within one cylindrical guide, and the yarn may be bent at the entrance and exit of the guide. Such a method of the present invention can be applied when drawing and simultaneously false-twisting various synthetic fiber undrawn multifilament yarns, but the birefringence obtained by high-speed spinning as the supplied multifilament yarn
Multifilament yarn (POY) consisting of partially oriented undrawn polyester fibers of 0.025 to 0.080, single fiber denier 15 to 25 de, total denier 300 to 450 de.
The effect is particularly great when applied to When drawing and simultaneously false-twisting such a multifilament yarn (POY), it is said that it is preferable to set the temperature of the twist-setting heater to higher than 200°C (Japanese Patent Application Laid-open No. 35112/1983), but this paper When implementing the invention, the heater temperature should be set to 160℃ or higher and lower than 200℃,
In particular, the temperature is set within the range of 170 to 190°C, and the upstream yarn tension t ₁ of the false twisting means 6 and the downstream yarn tension
When the ratio (t ₂ /t ₁ ) to t ₂ is 1.5 to 2.5, the splitting property of the crimped yarn obtained by processing the multifilament yarn (POY) becomes particularly good. The crimped yarn produced in this manner can be divided into single yarn (monofilament) or fine denier multifilament yarn by a conventionally known method. Figure 3 is a process schematic diagram showing an example of fiber separation, with 12
13 is a crimped yarn package, 13 is a guide roller,
14 is a dancer roller for tension adjustment, 15A, 15
B, 15c is a yarn guiding guide, 16 is a separating roller, 1
7 is a winder. In the figure, the crimped yarn processed by the method of the present invention is pulled out while rotating the package 12 in the direction of the arrow and adjusted to a predetermined tension by the drawer dancer roller 14,
The fibers are separated into a predetermined number by a fiber separating roller 16 having a convex curved surface using B and 15C as fulcrums, and then wound by a winder 17 driven by a common shaft. The crimped yarn for splitting according to the present invention can be divided well even by such a splitting method, and has a splitting property comparable to that of conventional crimped yarn made from ordinary drawn yarn. show. 〓〓〓〓
Next, examples of the present invention will be described in detail. The effects of the present invention will become clearer from these Examples. Example A polyethylene terephthalate undrawn multifilament yarn of 380 de/12 fie obtained by high-speed spinning (birefringence 0.043) was subjected to stretching and false twisting at the same time using the stretching and false twisting apparatus shown in Fig. 1 under the following conditions. Ivy. Stretching false-twisting processing conditions Stretching ratio: 1.58x Heater temperature: 190°C Yarn bending angle (θ ₁ + θ ₂ ): Changed from 0 to 90° Spindle rotation speed: 42×10 ⁴ rpm Processing tension: t ₁ … ...47～50g Untwisting tension t ₂ ...84～88g Tension ratio (t ₂ /t ₁ ) ...1.7～1.8 Processing speed ...200m/min Stretching after processing ... Change overwinding at 0% - 10% Feet: 5% Twelve 4 types of crimped yarns (240 denier) processed by changing the yarn bending angle and post-processing stretch within the above ranges and keeping other conditions constant were processed using the apparatus shown in Figure 3. The fibers were separated into yarns and wound at 150 m/min. The results of these experiments are summarized in Table 1. 【table】

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a drawing and simultaneous false twisting device showing one embodiment of the present invention, Fig. 2 is an enlarged view of the vicinity of the yarn bending guide in the device of Fig. 1, and Fig. 3 is a diagram of the fiber splitting device. It is a schematic side view which shows an example. DESCRIPTION OF SYMBOLS 1... Package of undrawn multifilament yarn, 3... Feed roller, 4a, 4b... Yarn bending guide, 5... Heater for twist setting, 6... False twist imparting means, 8... Stretched delivery roller, 9... …
Stretch roller. 〓〓〓〓

Claims (1)

[Scope of Claims] 1. When a synthetic fiber undrawn multifilament yarn is drawn and simultaneously false-twisted to produce a crimped yarn for fiber splitting, between the feed roller of the drawn-false-twisting device and the twist-setting heater. A yarn bending guide is provided in the yarn bending guide, and the yarn exiting from the feed roller is bent by the guide, and the yarn is stretched by 2 to 6% following the drawing and false twisting process, and then wound. Manufacturing method of crimped yarn for textiles. 2. Claim 1, in which two or more yarn bending guides are provided between the feed roller and the twist setting heater, and the guides bend the yarn exiting the feed roller at a total angle of 60 to 180 degrees. A method for producing a crimped yarn for splitting as described in . 3. Claim 1, wherein the synthetic fiber undrawn multifilament yarn is a multifilament yarn with a total denier of 300 to 435 de, consisting of partially oriented undrawn polyester fibers with a birefringence of 0.025 to 0.080.
A method for producing a crimped yarn for splitting as described in . 4 The temperature of the heater for twist setting is 160°C or more and less than 200°C, and the tension ratio before and after the false twisting means (t ₂ /
The method for producing a crimped yarn for splitting according to claim 1, wherein t ₁ ) is 1.5 to 2.5.