JPH0144809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a latent bulky bound spun yarn made of synthetic fibers with irregular cross-section and latent crimp.

Due to the need for innovation and rationalization of the spinning process, open-end spinning replaced ring spinning, and open-end spinning has demonstrated its uniqueness mainly in the field of thick yarns, with a large number of rotor circuits. Coupled with the increase in the number of players, it is expanding its influence to include the medium-sized range.

On the other hand, the traditional actual twist spinning method has been replaced by a bundling spinning method that effectively utilizes false twist, and by taking advantage of its features such as high-speed productivity and a range of spinnable counts centered on medium-count yarns, However, the thread started to appear on the market.

Due to its merits, this method will be used more and more in the future.
It seems likely that its range of applications will continue to expand. but,
Due to the characteristic of the thread, that is, its hardness, it is suitable for applications such as gauze and voile that take advantage of its silkiness, but it is difficult to apply it to applications that take advantage of its softness and bulk.

Analysis of bound spun yarns and knitted fabrics made from them reveals that their hardness is mainly due to the fact that the wrapped fibers are almost untwisted fiber bundles due to the rapid twisting and untwisting action performed by the pneumatic false twisting spindle. This is due to the fact that the fibers are tightly bound and that the fiber bundles to be wound are not twisted and there are no voids between the fibers.

The present invention focuses on the fact that the yarn is untwisted and has no voids between the fibers, and aims to improve the above-mentioned drawbacks and provide a potentially bulky bound spun yarn.

To this end, the present invention has the following configuration. That is, the present invention provides a spun binding yarn consisting of a core fiber bundle and binding fibers wound around the core fiber bundle, in which the binding spun yarn is mainly composed of synthetic fibers having an irregular cross section and latent crimp. It is a bound spun yarn with latent bulkiness.

The present invention will be explained in detail below.

The core fiber bundle (substantially untwisted fiber bundle) in the bound spun yarn is restrained by the wrapped bound fibers,
As a result, it can be considered that it is responsible for most of the yarn strength. By observing the state of this unity,
It has been found that if bulk can be imparted to the core fiber bundle between the bound fibers, the bulkiness of the bound spun yarn can be ensured.

However, when synthetic fibers having ordinary mechanical crimping are used, so-called spinning distortion occurs during the process up to producing bound spun yarn, and the crimping becomes flat. Therefore, it is necessary to crimp the core fiber bundle constituting the resulting bound spun yarn in order to give it bulkiness as a yarn or knitted fabric, and as mentioned above, this is not possible with mechanical crimp. be. The present invention is a latent bulky bound spun yarn that is composed of a yarn or a knitted fabric having an irregular cross section that exhibits three-dimensional crimp, and whose constituent fibers are mainly synthetic fibers with latent crimp. The synthetic fibers are also subjected to spinning distortion during the process of forming bound spun yarn, but the potential crimp of the fibers is 1/ρ (where ρ is the shrinkage treatment temperature (boiling water
This is the helical diameter (mm) of the crimping that occurs when a fiber in a non-tension state is treated for 15 seconds at 100°C. )
A range of 5 to 30 is appropriate. When 1/ρ is less than 5, the bulk of the yarn or knitted fabric is small, and when 1/ρ is greater than 30, the area where the binding fibers are restrained and the area where crimping occurs between them are small. There is a big difference, and it becomes a design thread. This yarn can also be used depending on the purpose, but its bulkiness is different from that of general clothing. An example of a modified cross section of the synthetic fiber of the present invention is shown in the figure. Figure 1 is a u-section with three protrusions 1, 2, and 3, Figure 2 is a u-section,
FIG. 3 shows a u-section with one protrusion 4. Factors that impart bulk to bound spun yarns or knitted fabrics include manifestation of the latent crimp of the synthetic fibers described above, and irregular cross-sections, particularly cross-sections having hollow portions. In order to provide interfiber voids to the substantially untwisted core fiber bundle constituting the bundled spun yarn, both the bulkiness due to the cross section of the fibers themselves and the bulkiness due to crimping of the fibers are considered. The present invention provides both, the profiled cross-section and the latent crimping, an effect that is far greater than that of the profiled or hollow cross-section alone, which prevents significant bulk. The fibers used in the present invention are synthetic fibers, and among these, polyester fibers are preferred from the viewpoint of dimensional stability. Polyester fibers are polyesters whose main constituent units are alkylene terephthalate units, preferably 80% ethylene terephthalate units.
A fiber obtained by spinning a fiber-forming polyester consisting of copolyester, homopolyester, or a mixture thereof containing mol% or more. Examples include changing the degree of quenching and laminating with a bimetal type to provide latent crimp.

Next, the synthetic fibers constitute a bound spun yarn in the form of staple fibers, such as cut of equal length or cut of unequal length, and the fineness (denier) of the staple fiber is 0.5 denier or more and 4 denier or less. preferable. Further, it is preferably 0.5 denier or more and 1.0 denier or less. If it is less than 0.5 denier, the ability to develop latent crimp will be weak and the desired bulk will not be obtained. Moreover, if it exceeds 4 denier, it becomes difficult to obtain a strong yarn due to the relationship between the number of constituent fibers, the number of bundled fibers, and the yarn count. Further, the average fiber length (mm) of the staple fiber is 25 mm or more, preferably 25 to 25 mm.
245 mm, more preferably 25 to 100 mm. If it is less than 25 mm, the pitch of the bundled fibers must be reduced in relation to the yarn strength, and the rate at which essentially untwisted core fiber bundles appear on the yarn surface will inevitably decrease.
The degree of manifestation of latent crimp is reduced, and the bulk of the yarn or knitted fabric is reduced. Therefore, the longer the average fiber length (mm), the better, but there is a limit to this as well.
If it exceeds this value, the yarn will not be as tight as it should be, resulting in a feeling of bulkiness rather than bulkiness, which is not preferable. In order to reduce this feeling of bulkiness, the average fiber length is preferably 245 mm or less, more preferably 150 mm or less. Although it is preferable to construct the bound spun yarn only from the synthetic fibers, even if it is blended with other fibers, for example, ordinary polyester fibers, natural fibers such as cotton, wool, synthetic fibers, regenerated fibers, etc. It can be used depending on the purpose. In any case, it is sufficient that the material mainly contains, for example, 50% or more of synthetic fibers having an irregular cross section and latent crimp.

As described above, the present invention is a bulky spun yarn that is highly bulky and has a dry touch feel, and has features that conventional spun yarns do not have.

Example: Bundled spun yarn (English count 40 ^'s ) made of polyester fiber (fineness 1.4 denier, unequal length, average fiber length 85 mm, 1/ρ = 15) with latent crimp in the cross section shown in Figure 1. A pique was knitted with a single knit using bound spun yarn (English thread count) made from polyester fiber (fineness 1.4 denier, unequal length, average fiber length 85 mm) that had been given regular mechanical crimping. The knitted fabric made of the latent bulky spun yarn of the present invention was bulky and dry-touch after being treated with boiling water, compared to the knitted fabric made of the spun yarn using ordinary fibers.

[Brief explanation of drawings]

The figures are cross-sectional views of synthetic fibers according to the present invention.
The figure is a sectional view showing a U-section, and FIG. 3 is a sectional view showing a U-section with one protrusion.

Claims (1)

[Claims] 1. A bundled spun yarn consisting of a core fiber bundle and bound fibers wound around the core fiber bundle, characterized in that the bundled spun yarn is mainly composed of synthetic fibers having an irregular cross section and latent crimping. A bound spun yarn with potential bulkiness.