JPS59228034A - Composite sewing machine yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a fabric ta'a which has excellent sewability and is highly elastic.
This invention relates to a high-quality composite sewing thread that can maintain excellent seam strength even when used for.

In recent years, synthetic fiber sewing threads, especially polyester spun sewing threads, have been rapidly increasing their market share due to their high strength and cost advantages, but they are inferior in sewability compared to conventional cotton Katan threads, and are particularly prone to skipped stitches. has shortcomings,
There were problems with sewing efficiency and quality.

In order to improve these drawbacks, attempts have been made to make polyester staple fibers highly modulus, or to make polyester spun sewing yarns highly modulus by subjecting them to spun yarn and then subjecting it to hot drawing treatment. However, polyester spun sewing thread subjected to high modulus treatment tends to have a significantly lower elongation at break as the modulus increases, making it weaker against impact forces, especially in the case of sewn fabrics with high elasticity. had the problem of thread breakage due to its low elongation at break. In other words, polyester spun sewing thread has excellent sewability and can maintain sufficient seam strength even on highly elastic fabrics.
Previously, there were no such cases.

The present invention was developed as a result of extensive research into thread sewing thread that has such sewability, particularly without the occurrence of skipped stitches, and maintains sufficient seam strength or seam impact strength when used on any fabric. The purpose of the present invention is to provide a composite sewing thread consisting of a high-quality synthetic fiber multifilament and a stable fiber group, which has excellent sewability, maintains sufficient seam strength, and has vines and other properties. In order to achieve this object, the present invention has the following configuration.

That is, the present invention provides a composite yarn consisting of a synthetic fiber multifilament and a group of stable fibers, and the composite yarn has an initial tensile resistance in the range of 26 to 6 o y/a and a strength of 4.3 f/a. The composite sewing thread is characterized by having a breaking elongation of 17% or more and a breaking elongation of 17% or more.

The present invention will be explained in detail below. The composite sewing thread according to the present invention is composed of a composite yarn made of a synthetic fiber multifilament and a group of stable fibers.

This stabilizes the thread sliding characteristics of the compound sewing machine by making the thread even, reduces fluctuations in the strength and elongation curve of the thread, stabilizes the formation of needle thread loops during sewing, and improves sewability. In addition, the strength and elongation at break are improved by mixing high-strength synthetic fiber multifilament.

The synthetic fibers used in the multifilament synthetic fibers include polyester fibers, polyamide fibers,
Examples include polybutylene terephthalate fiber. Among these, polyester fibers are preferred because they have high strength. Polyester fibers include polyester whose main repeating unit is ethylene terephthalate, copolyester whose main repeating unit is ethylene terephthalate,
Or it includes fibers obtained by spinning blended polyesters.

On the other hand, stable fibers include natural fibers, recycled fibers,
Examples include staple fibers such as semi-synthetic fibers, synthetic fibers cut into equal lengths or unequal lengths, or cut fibers obtained by tow spinning. Among these synthetic fibers, the polyester-based staple fibers described above are preferred from the viewpoint of strong freshness.

Next, the mixing ratio (% by weight) of staple fibers in the composite yarn is preferably in the range of 20 to 70% by weight, and particularly preferably in the range of 30 to 50% by weight. When the staple fiber content is less than 20%, the entanglement with the synthetic fiber multifilament becomes poor, and the staple fibers tend to move easily against frictional resistance.When the staple fiber content exceeds 70%, the fiber becomes uniform and the strength and elongation properties become uniform. This is because the effect will be less in terms of conversion.

In addition, as a mixed form of a fiber multifilament and a stable fiber group, a so-called core yarn having a synthetic fiber multifilament as a core and staple fibers as a sheath, and a synthetic fiber multifilament that is opened,
One example is a composite yarn in which so-called synthetic fiber multifilament and staple fiber are mixed, which is produced by overlapping and twisting a group of drafted stable fibers.

In particular, the mixed fiber method is preferable in terms of uniformity of the filament.

Furthermore, it is necessary that the initial tensile resistance is in the range of 26 to 6 o y/a. This is particularly related to the occurrence of skipped stitches, and as the initial tensile resistance is increased, the loop formation of the needle thread becomes larger during sewing, which stabilizes the needle thread and eliminates mistakes when threading the bobbin by the looper.
,'a or more.

However, when the initial tensile resistance exceeds 60 r/a, the composite sewing thread becomes hard and puckering occurs.
This will adversely affect seam quality. Therefore, it is necessary to set it in the upper range. Note that the initial tensile resistance (f/d
) is JIS-L-1095 general spun yarn test method 7.1
3 This is a value measured using a constant speed extension type tensile tester (Tensilon, manufactured by Toyo Baldwin Co., Ltd.) according to the test method for initial tensile resistance. In order to adjust the initial tensile resistance within the above range, it is possible to increase the modulus of conventional polyester spun sewing thread, such as by hot-stretching synthetic fiber multifilament to make it highly modulus, or by hot-stretching it after composite. The method used for this can be applied.

Further, the strength of the composite yarn must be 4.3 r/d or more, and the elongation at break must be 17% or more. If the strength is less than 4.397d, severe sewing @N
4.3 r/d or more is required because thread breakage is likely to occur due to force, and sewing thread breakage is likely to occur in fabrics such as sports clothing where high tension is easily applied to the seams. Also,
The reason why the elongation at break must be 17% or more is not only to improve the impact resistance during sewing, but also to maintain sufficient seam strength for highly elastic fabrics. .

Seven stitches and also composite threads of 1mm or more are already 200~
Having a fuzz index in the range of 900 threads/10 m is preferable in order to obtain a composite sewing thread having a uniform appearance and stable sewability by improving the degree of tightening during sewing, that is, the tightness of the thread. If the fuzz index is less than 200 pieces/10 m, there will be disadvantages such as poor stitching and reduced heat resistance during high-speed sewing. On the other hand, if the fuzz index exceeds 900 pieces/10 m, the appearance of the seams becomes poor. Therefore, a diagonal range is preferred. The fuzz index is a value measured using an F-index tester manufactured by Shikishimabo RJ Co., Ltd.

The composite sewing thread of the present invention constructed in this manner not only completely eliminates the problem of skipped stitches, which is a drawback of conventional polyester spun sewing threads, but also maintains a stable sewing condition and improves sewing performance. The finish is extremely clean, there is less thread breakage during sewing, and it has the characteristics of high strength and high elongation, so the seam strength is extremely strong compared to conventional seams, and it has remarkable effects. It is something to look after.

Example 50 denier/24 filament polyester fiber multifilament yarn (strength 6.8 r/d).

A staple fiber bundle (1,2 denier, 44 ends, etc.) of drafted polyester fibers is electrospreaded and supplied between the 70 roller and the second roller upstream of the 70 roller of a spinning machine (elongation 15%). 60” (long cut) and twisted with a twist coefficient of 3.5 (inch method).
It was made into a composite spun yarn of English style cotton count). Thereafter, three of these composite spun yarns (two directions) are aligned, and the composite spun yarns (two directions) are aligned.
The cheese was twisted at 850 t/m in the opposite direction, and then dyed using dye at 130° C. for 40 minutes.

The obtained dyed yarn is passed through a two-stage setter, and
The second step was elongated by 6%, heat treated at 210°C for 0.8 seconds, and
The material was fed with 4% adverb and heat treated at 225 DEG C. for 0.8 seconds, and then oiled with silicone as a heavy material to make a 1-go sewing thread. Table 1 shows a comparison of the f′J′ ability of the composite sewing thread of the present invention thus obtained, a conventional polyester spun sewing thread (A), and a conventional polyester spun sewing thread with high modulus (B). It was as follows.

In Table 1, the strength, initial tensile resistance, elongation, break tension, and strength/elongation curves were drawn and read using a constant speed extension type tensile testing machine (manufactured by Toyo Baldwin Co., Ltd., Tensilon). Further, the wing index (ko/lom) was measured using the above-mentioned F-index tester.

Furthermore, thread breakage and skipped stitches were evaluated by the number of defects that occurred when 1000 sheets of 4 sheets of 4-sen (using 50°S cotton thread) were stacked on jersey and sewn using a flat two-needle sewing machine. Also, t4jP with the above trial yarn for seam opposition M@sake! The degree of seam breakage when a weight of approximately 9 out of 10 is dropped onto the seam after fixing the seam under constant tension is ranked from least to most with marks ◎ to △. I added it. Furthermore, the appearance of the seams was determined visually.

As described above, the composite sewing thread of the present invention had excellent sewability, beautiful seam appearance, and excellent seam impact strength compared to conventional polyester spun sewing thread.

Patent Applicant: Toyobo Co., Ltd. Procedural Amendment July 27, 1981 1. Indication of the Case: 1982 Patent Application No. 102398 2. Name of the Invention: Composite Sewing Thread 3. Person Making the Amendment: Relationship with the Case: Patent Application Column 5 of the detailed description of the invention in the specification No. 2-2-8 Dojimahama, Kita-ku, Osaka City ” he corrected.

Claims (1)

[Claims] 1. A composite yarn consisting of a synthetic fiber multifilament and a group of stable fibers, the composite yarn having an initial tensile resistance in the range of 26 to 60 r,'d and a strength of 4.35
'/d or more, and has a breaking elongation of 17% or more. 2. The composite sewing thread according to claim 1, wherein the synthetic fiber is a polyester fiber. 3. Claim 1 or 10F, wherein the stable fiber group is a stable fiber # group of polyester fibers.
The composite sewing thread according to claim 1, 2, or 3, which is a composite yarn having a fuzz index in the range of 7Z.