JPS62299508A - Special bulky yarn and spinneret therefor - Google Patents

Abstract

PURPOSE:A special bulky yarn, consisting of modified cross-section hollow fiber having plural projections with outer tip thereof branched into plural parts and capable of giving a extremely bulky carpet having extremely excellent durability without deteriorating bulkiness in use. CONSTITUTION:A specical bulky yarn of cross section having >=1 hollow portions having plural projection portions extending radially outward from the center and having plurally branched tips. The yarn is obtained by spinning through a spinneret consisting of >=3 slits 1-3 for forming the hollow portion, slits 4-6 for forming projection, which are between two respective slits 1-3 and extending radially towards the outside of the slit from the inside of the slit and portions 7-9 branched into plural parts at the tip thereof.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Industrial Field of Application) The present invention relates to irregularly shaped hollow fibers having protrusions and spinnerets thereof, and more specifically to carpets that particularly require stain resistance and bulkiness. This invention relates to a bulky irregularly shaped hollow fiber suitable for various fields and a spinneret for the same.

(Prior art) Conventionally, as a means of improving the bulkiness of yarn,
As seen in Japanese Patent No. 6-20770, it is common practice to modify the cross section of the yarn. In particular, the trilobal type is a typical example. It is also known that if the ratio of the circumscribed circle a to the inscribed circle of the yarn cross section is a/b = degree of irregularity, then the degree of irregularity can be increased in order to improve the bulkiness.

It is also known from Japanese Utility Model Publication No. 12856/1983 to provide a hollow section in the cross section of the fibers to improve stain resistance and bulkiness. Furthermore, yarns with protrusions on the hollow fibers were also disclosed in Japanese Patent Application Laid-Open No.
This method is known from Japanese Patent Application Laid-open No. 4-15023, Japanese Patent Application Laid-Open No. 48-42134, etc.

(Problem to be solved by the invention) However, when the degree of irregularity is increased in yarns with irregular cross sections, the bulkiness is improved, but when the degree of irregularity exceeds a certain level, the deformation of the yarn cross section becomes large. In addition, in the case of hollow cross-section fibers described in Japanese Utility Model Publication No. 58-12856, there is a limit to bulkiness, and trilobal yarns have much higher bulkiness. Not as good as that.Furthermore,
JP-A-54-15023, JP-A-48-4213
The yarn having a hollow portion and a protrusion described in Publication No. 4 and the like has short protrusions protruding outside the cross section, and is not of sufficient quality in terms of bulk.

In particular, in the case of yarns with a cross-sectional shape having protrusions extending radially outward from the center, such as conventional trilobal yarns and irregularly shaped hollow fibers, as shown in FIGS. 4 and 5, the protrusions The portions fit into each other, and the substantial bulkiness of the yarn is significantly reduced.

An object of the present invention is to eliminate such conventional problems and provide a special hollow bulky yarn having high bulkiness and a spinneret for the same.

(Means for Solving the Problem) As a result of intensive studies to achieve the above object, the present inventors found that it is sufficient to branch the outer tip of the protrusion of the irregularly shaped hollow fiber into a plurality of pieces. They discovered this and arrived at the present invention.

That is, the first invention of the present application has one or more hollow portions in the fiber cross section, and one end thereof has a plurality of protrusions extending radially outward from the center of the fiber cross section. , is a special bulky yarn characterized in that the outer tip of the protrusion is branched into a plurality of parts, and the second invention of the present application is characterized in that the outer tip of the protrusion is branched into a plurality of parts, and the second invention of the present application is characterized in that the outer tip of the protrusion has at least three slit sides forming a hollow part, and the slit A special bulky product comprising a protrusion-forming slit located between each side and extending radially from the center, and furthermore, the outer tip of the protrusion-forming slit branches into a plurality of parts. It is a spinneret for yarn.

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view showing an example of the special bulky yarn of the present invention, and in this case, the yarn has one hollow portion and three protrusions. The inside of the hollow portion communicates in the longitudinal direction of the fiber. On the other hand, the protrusions P, , P2, P extend radially outward from the fiber center 0 at equal angles, and the outer tips e,
, ez, e3 are branch parts B+, B+' i
Bz, Bz'; branched into B3 and Bs, respectively. In addition, L is usually 10 parts or more, preferably 30 parts
~100μ.

In addition, when the inner ends e, r, ez', e' of the protrusion protrude into the hollow part, the protrusion extending outward is supported and balanced by the protrusion that is also on the inside. This is preferable because it extends radially outward without bending, improves bulkiness, and further reduces the deformation and bending of the protrusion in response to external forces.

Fig. 2 is a sectional view showing an example of a die suitable for obtaining the special bulky yarn of the present invention, and has three slits 1.2 for forming an arc.
．． The protrusion forming slits 4.5.6 are located in the gaps between the slits 3 and each slit, and the outer tips extending radially from the center are constituted by branched slits 7.8.9. Here, the polymer discharged from the protrusion forming slit 4.5.6 swells to fill the slit gap 10.11.12 as described later, making it easier to form a hollow portion. Here, the protrusion-forming slit 4.5.6 must be located within the gap 10.11.12 of the arc-forming slit 1.2.3, otherwise this effect cannot be obtained. In addition, the arc-forming slits 1.2.3 are preferably linear, and a circular arc curved inwardly is preferable to one curved outwardly from the viewpoint of forming a hollow portion. The reason for this is that the surface tension force is accompanied by a force directed toward the center of the cross section (inward deformation). In other words, since the cross section is formed so as to contract inward, it is easy to form a hollow portion. That is, in the spinneret of the present invention, taking FIG. 2 as an example, the protrusion-forming slit 4.5.6 is independent of the arc-forming slit 1.2.3, and the slit gap (canal) of the latter is Because it is arranged through the slit 1.
No outward expanding force acts on the discharged polymer from 2.3. Furthermore, even if the molten polymer discharged from the end of the slit 1.2.3 undergoes a single expansion and its expansion is reduced due to surface tension, the protrusion-forming slit 4.5
．． Since the molten polymer discharged from 6 increases in its width direction, the slits 1, 2, and 3 are connected to both adjacent ends of the slits 1, 2, and 3 in the gap 10, 11, and 12, and the protrusion-forming slits disposed therebetween. The polymers discharged from 4.5.6 bond very easily.

As a result, perfectly shaped hollow fibers as shown in Figure 1 can be stably obtained, and spinning conditions such as polymer temperature, spinning speed, polymer discharge amount, and spun yarn cooling conditions can be varied during spinning. Even if this occurs, there is no fear that a hollow portion will not be formed.

Moreover, in the spinneret of the present invention, a plurality of slits 1
．． Since the gaps 10, 11, and 12 are formed between the adjacent ends of 2.3, the number of gaps is naturally multiple, and sufficient strength of the spinneret can be ensured, and the discharged polymer is The cap will not be deformed by pressure.

The length of the branching slit 7.8.9 is preferably the same as the length of the protrusion forming slit 4.5.6, or shorter than that.

The above is an example of a triangular cross-section having one hollow part and three protrusions branched into two, but the present invention is not limited to this, and for example, the cross-section has four circular arcs. slit and 4
It may also have a four-lobed cross-section, which is spun using a spinneret consisting of slits for forming protrusions. In addition, it may be pentagonal, hexagonal, heptagonal, or octagonal with 5, 6, 7, or 8 protrusions.

Further, the number of branches at the outer tip of the protrusion can be three or more, and the number of hollow parts can also be two or more. Various combinations of these are possible.

The materials constituting the special bulky yarn in the present invention are not limited to thermoplastic fibers (polyester, polyester ether, polyamide, polyolefin), semi-synthetic fibers, recycled fibers, but when used for carpets, polyamide fibers, Polyester fibers are preferred.

The special bulky yarn of the present invention can be used as a raw yarn or in the form of an I-shrunk processed yarn for final products.

(Function) Since the special bulky yarn of the present invention is branched at the tips of the protrusions, the branching parts prevent the protrusions from fitting into each other as shown in FIG. As shown in FIG. 5, since the protrusions do not become intertwined with each other and the bulkiness decreases, the bulkiness is further improved.

Therefore, when a processed yarn using such bulky hollow fibers is used for carpet pile yarn, for example.

To provide a very bulky and durable carpet that is rich in bulk, has improved covering power, and is less prone to deformation of the yarn cross section due to external force, so pile collapse etc. are less likely to occur.

In addition, since there is a hollow part, accumulated dirt becomes visible due to diffused reflection, and it is also excellent in terms of antifouling properties.

(Example) Hereinafter, the present invention will be further explained by giving examples.

Example Using a spinneret having 68 nozzle holes of the shape shown in FIG.
Spinning at 00 g/min, cooling with wind ff1b
The fibers were spun at a spinning speed of 0 m/min. Here, the arc-forming slit 1.2.3 on the base is bored on a concentric circle with a diameter of 1.2'mm, the slit width is 0.1 mm, and the length of the protrusion-forming slit 4.5.6 is is 2 mm, the slit width is 0.1 mm, the gaps 10 to 12 are each 0.2 mm, and the protrusion length of the protrusion forming slit 4.5.6 from the arc forming slit 1.2.3 is It was set as 0.6 crane. In addition, slits 7.8 branched from slits 4.5.6 for forming protrusions.
The length of each of the slits 9 was 2 cranes and had an angle of 120° with respect to the slits 4, 5, and 6. The obtained undrawn yarn was preheated and stretched at a speed of 700 m/min, and then fed into a turbulent heated fluid nozzle and crimped according to the process shown in Figure 1 of Japanese Patent Publication No. 58-42291. . The obtained crimped yarn was 1600 denier/68 filament,
The mk morbidity rate was 15%.

The overfeed rate during the crimp process using the turbulent heating fluid nozzle was appropriately adjusted so that the crimp rate was 15%.

Using the obtained crimped yarn, loop tufting was performed at 1/10 gauge to create a carpet. Evaluation of crimped yarn and carpet 1111 The results are shown in the table below. 8 Comparative Examples 1 and 2 Using the spinning nozzle shown in Figures 6 and 7 (slit width, length, and interval are the same as in Example 1) The same treatment as in the example was carried out to obtain a crimped yarn of 1600 denier/68 filament with a crimp rate of 15%, and the same carpet as in the example was produced. The evaluation results for I-wound yarn and carpet are shown in the following table.

The bulk height and carpet evaluation method are as follows.

*Bulk height: After processing the crimped yarn in clean water for 30 minutes, drying it and winding it up with a tension of 7 mg/de until the reel occupies a volume of 20,002 mm, the used crimped yarn is The weight W of the shrunken yarn is measured and calculated using the following formula.

*Texture: Comprehensive evaluation based on the sensory evaluation when touching with the hand with a force equivalent to the force when stepping on it, and the measured value of the amount of work when a load of 0.5 kg/cat is placed on it.

Very good: ◎, good: ○, slightly poor: Δ, poor: ×.

It is clear from the results in the above table that the crimped yarn made of the hollow fibers of the present invention has high bulkiness, and when made into a carpet, has good bulkiness and texture.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of the special bulky yarn of the present invention;
FIG. 2 is a plan view showing an example of the spinneret of the present invention used when spinning the special bulky yarn shown in FIG. 1, and FIG. 3 is a schematic diagram showing the assembled state of the special bulky yarn of the present invention. Figures 4 and 5 are schematic diagrams showing the conventional yarn assembly state, and Figure 6
7 and 7 are plan views of a spinneret used when spinning conventional yarn. h...Hollow part, P, , Pg, P, l...Protrusion part, e, ,
et, ej...Outer tip of the protrusion, B1.
B, /・B2・B2′・B3・B3′・・・・・・
Branching portion, 1.2.3... Arc forming slit, 4.5.
6... Slit for protrusion formation, 7.8.9...
...Branch slit, 10.11.12...
Slot for forming arc, 7-edge gap.

Claims (1)

[Scope of Claims] 1. The fiber cross section has one or more hollow portions, and one end thereof has a plurality of protrusions extending radially outward from the center of the fiber cross section, A special bulky yarn characterized in that the outer tip of the protrusion has multiple branches. 2. At least three slit sides forming a hollow part;
It consists of a protrusion-forming slit located between each of the slit sides and extending radially from the center, and furthermore, the outer tip of the protrusion-forming slit branches into a plurality of parts. A spinneret for special bulky yarn.