JPH0364544A - Production of polyester sewing yarn - Google Patents

Abstract

PURPOSE:To obtain the title sewing yarn having excellent sewability by bringing a balloon formed by a twisting yarn into contact with an article having coarse surface to form raising in subjecting a polyester filament-based yarn to a bulking treatment and then twisting the yarn. CONSTITUTION:When a polyester filament-based yarn having 0.5-3.0, preferably 0.5-1.2 denier fineness of monofilament is subjected to a bulking treatment and then the yarn is twisted. Raising is formed by bringing a balloon formed by the yarn subjected to twisting into contact with an article (e.g. sand paper) having coarse surface to provide the objective sewing yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION E-INDUSTRIAL APPLICATION FIELD OF THE INVENTION The present invention relates to a method for producing sewably collapsed polyester sewing thread.

[Prior Art] In recent years, synthetic fibers such as polynisdel, which are characterized by improved strength, have become the mainstream for sewing thread, replacing natural fibers such as cotton and silk. However, while polyester ficimen 1 sewing thread has the advantage of being beautiful in appearance without causing fuzz, it also has the disadvantage of being inferior in heat resistance and cannot withstand high-speed sewing.

On the other hand, polyester spun sewing thread has 5 feathers, and the fluff improves the heat resistance of the thread, making it excellent for high-speed sewing, but on the other hand, it requires a spinning process, which increases the cost. Furthermore, it has the disadvantage that the quality is not evenly distributed.

In order to overcome the shortcomings of each of the three above and take advantage of their strengths,
In recent years, a core spun sewing thread has been proposed in which a polyester filament is used as a core thread and short fibers such as cotton, rayon, or polyester spun are intertwined with a sheath thread. but,
The cost of this method increases significantly, and therefore it has not been widely used. Further, JP-A-51-136947 proposes a method in which the surface layer of bulky synthetic fibers is raised and then twisted.

However, since this method requires a separate napping process, it clearly results in a one-store stubble, and furthermore, the napping is not uniform or rough, and the quality (particularly strength) of the sewing thread varies greatly, making it impractical for practical use.

[Object of the invention] The present invention solves the conventional drawbacks as described above, and provides a method for manufacturing a polyester sewing machine that has excellent high-speed sewing properties, uniform quality, and can be manufactured at low cost. It's about making suggestions.

[Structure of the Invention] The present invention provides that when a polyester filament l~ yarn having a single fiber fineness of 0.5 to 3.0 de is bulked and then twisted, a balloon formed by the yarn during the twisting is roughened. This is a method for producing polyester sewing thread, which is characterized by bringing face pieces into contact with each other and raising the nap.

The present invention will be explained in more detail. In the present invention, bulking processing means crimping, loosening, sagging, etc. in the filament system.
Examples of processing for forming loops include Taslan processing using jet turbulent fluid, false twisting without false twisting, and the like.

The binding string used in the present invention is a polyester filament, and its single fiber fineness is 0,
5-3. 0de is preferred, more preferably about 0de
．． 5 to 1.2 de is optimal. Single fiber fineness is 3
If it exceeds de, the strength of single m fibers is so high that it is difficult to raise the fluff, and the number of fluff increases, resulting in poor fluff uniformity. If strong napping is applied to improve these problems (for example, by using a tracheid with a large roughness), process troubles such as cutting of the threads themselves will occur, and quality variations will increase, which is not preferable.

On the other hand, if the single fiber fineness is less than 0.5 de, raising is easy, but there is a risk that the raising will be excessive and the process will be unstable.

The present invention is characterized in that the raising process is performed simultaneously with the yarn twisting process. In the yarn twisting process, known machines such as an Italian type yarn twisting machine, a link type yarn twisting machine, etc. can be used. For filament sewing thread, a single thread is first twisted in the S direction, and then multiple threads are combined and twisted in two directions. Twisting is imparted to the yarn either by feeding the yarn vertically and winding it onto the bobbin via a traveler (ring twisting method) or by taking out the yarn wound around a hobbin (Italian twisting method). . In these yarn twisting processes, the yarn forms a balloon around the bobbin due to centrifugal force. The present invention
The balloon is brought into contact with the rough surface, and the loops and single fibers in the sagging portions exposed on the surface of the previously bulked polyester filament yarn are cut and raised.

The raising process may be performed during the first twisting, the first twisting, or both, but it is preferably carried out during the first twisting process.

Furthermore, it is preferable that the relationship between the single fiber fineness and the number of twists (T/m) is within a range that satisfies the following.

When the number of twists (T/m) is large, the number of times of contact with the rough surface increases, and strong napping is performed, but on the other hand, the napping is done and fluff is generated, and the strength decreases and the variation in strength is large. Please be careful as there are negative consequences such as: On the other hand, when the single fiber fineness is low, it is preferable because the number of fuzz increases and there are advantages such as ease of raising.

[Operations and Effects of the Invention] As described above, the present invention utilizes the yarn twisting process included in the conventional manufacturing process of sewing thread to impart optimal fuzz to sewing thread. That is, in the present invention, a polyester filament yarn with an optimum denier that is easy to raise is used, and this is subjected to a bulking process to form loops and slacks on the surface of the bulky processed yarn, thereby further improving the raising property. be. The raising process utilizes a thread twisting process and is performed simultaneously with twisting, so the increase in cost is extremely small. The raising process is carried out by bringing the balloon into contact with the rough surface, and since the yarn forming the balloon contacts the rough surface while rotating, the entire circumferential side surface of the yarn is contacted and raised. Furthermore, due to the yarn twisting process, single fiber fluffs do not grow long, and many short fluffs can be generated. That is, the present invention forms a large number of uniform short fluffs on all four circumferential surfaces of sewing thread at low cost. As a result, a sewing thread suitable for high-speed sewing, which has excellent heat resistance and properties due to the large effect of the fluff, can be obtained.

[Example] Polyester terephthalate having an ultra-thin viscosity of 771.0 is melt-spun using a conventional method and then stretched to obtain polyester ficimen 1 to yarn having a total fineness of 75 denier/72 filament 1 to (single fiber fineness of 1.04). Then, the polyester filament yarn was subjected to false twisting and bulking processing by a conventional method to obtain a single yarn for sewing thread. After applying the S twist of 1000'l''/M to the single yarn for sewing thread using an Italian twisting machine, three of these are combined to give a Z twist of 800 T/M.In this twisting process, Trachyhedrons on the growing balloon [Buken ■
A brushed paper (CC400) was brought into contact with the material. The resulting brushed yarn was twisted at a temperature of 90°C for 30 minutes, and then twisted at a temperature of 130°C by a conventional method.
Dyeing was carried out for 0 minutes, and 3% (q) of silicone-based sewing thread was added to obtain sewing thread.Polyester Filamen 1, which is commonly sold as sewing thread for comparison, was used as sewing thread. The test results of the sewing thread obtained according to the present invention using , and polyester spun sewing thread are shown in Table 1. The measured values herein are the values obtained by the measuring method described below.

(a) Sewing thread fineness, JIS-L-1013-7,
3. Based on the simple method.

(o) Strength and elongation of sewing thread, JIS-L-10
According to 13-7, 5, 1. (For the fluctuation rate, see i, '11.2
by. ) (c) Number of fluff: Azuma ■ Fuzz coefficient device HOD
The results of measurements using EL-DT-104 at a yarn speed of 25 m/min and a measurement time of 1 minute were converted into the number of fluffs per 1 m.

(d) U%, JIS-L-1095-7,20,1
According to the eight laws.

(EVENNESS-TESTER manufactured by Keikiki Kogyo ■ was used) (e) Lockstitchability: Sewing was performed under the following conditions and indicated as the maximum number of revolutions at which the sewing thread did not break.

Sewing machine, - Full needle lockstitch sewing machine (DDL555 manufactured by JIIKI@) Sewing machine rotation speed, 2000, 2500, 3000, 35
00,4000450045005ooorp River sewing machine total: #14 Sewing cloth, 'l'/R Zarge 4-ply sewing time: 1 minute Table 1 The sewing thread according to the present invention has the quality (strong, U%) as shown in Table 1. Uniform and short fluff (0.51+1m or more)
It has a lot of properties and can be easily sewn with lockstitch.

Claims (1)

[Claims] When a polyester filament yarn having a single fiber fineness of 0.5 to 3.0 de is bulked and then twisted, the yarn is raised by bringing a rough surface into contact with a balloon formed by the yarn during twisting. A manufacturing method for polyester sewing thread.