JPS61289150A - 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 (Field of Industrial Application) The present invention relates to a non-twist sewing thread that does not have a twisted structure.

(Prior art) Synthetic fiber filament sewing threads are generally used as plied threads, and in particular, they are given a nine-fold twist to make the entire sewing thread non-torque, and the round threads are pre-twisted and plied to balance the twist, and are further heat set. It is commercialized by suppressing the torque expression by using such methods. However, when the sewing machine thread is squeezed under high tension during sewing, the twist movement occurs due to the twisted thread structure, and the twisted thread becomes in a lying state, even if the torque is originally suppressed. Heavy or triple snarls occur, making it impossible to unravel.

As a yarn that has a non-twisted structure and is bundled, a yarn made by subjecting multifilament to fluid agitation is known.

This yarn has a bulky structure and is bundled, but because of its protruding loops, when the yarn is wound into a package, a so-called Velcro phenomenon occurs in which the yarn layers become entangled with each other, and when unraveled, the yarn gets caught and the tension changes due to this. is further enlarged with a sewing mini Von upper high tension crab.

It had the drawbacks of causing the thread to dance, spread, and even break, making it unsuitable for sewing machine thread. For this reason, additional twisting or combined twisting is performed after fluid disturbance treatment.

In addition, a method has been proposed in which the loops that cause the Velcro phenomenon are cut and raised (Japanese Patent Application Laid-Open No. 51-13694
7). However, this was not possible due to the complicated process and production costs.

(Problems to be Solved by the Invention) The present invention is a sewing thread treated with fluid agitation that does not have a twisted yarn structure that is likely to cause kinks, but the sewing thread does not have a Velcro phenomenon and is tightly focused. To provide a sewing thread that is easy to unwind from a package and has excellent sewability.

(Means for solving the problem) A synthetic fiber made of 100 or more monofilaments of 0, 5 to 3.0 deniers that has been subjected to fluid agitation treatment, instead of having a twisted yarn structure that causes twisting due to high tension on a sewing machine. In a filament sewing thread, there are closed loops inside and outside the sewing thread, and the outermost diameter of the loop forming the closed loop or the protruding length of the loop protruding from the surface of the sewing thread is:
Both of them have an average outer diameter of less than the average outer diameter of the sewing thread, and the number of closed loops is 1000 loops or more, and the μm loops and monofilaments are entangled and tightly bound and bundled. The problem can be solved with sewing thread.

The Percro effect of a fluid disturbance treatment system occurs when protruding loops from sewing threads become entangled with each other. The protruding loops have closed and open loops), and the open loops are easy to move due to the entanglement between the threads, which is resolved by a slight stretching of the thread, and the Percro effect is difficult to occur, but the closed loops are the cause of this problem. It's easy to do. If the closed loop is made small, the Percro effect can be reduced, but this also reduces the convergence of the thread body, and when the thread is twisted and stretched, the thread opens up, which naturally impairs the sewability. I end up. As a result of intensive research on this point, we found that over a certain range of single denier filaments,
It has been found that a sewing thread with good sewability can be obtained if there are a certain number of closed loops of a certain size. If the single thread denier is less than 0.5 denier, the thread is too soft and it is difficult to form louver μm on the sewing machine during sewing, causing skipped stitches.
If the single thread denier exceeds 3 denier, it becomes impossible to create many minute closed loops on the thread body, and as with conventional sewing thread, the large loops make it difficult to unwind from the bobbin and cause poor sewing performance.

Regarding the number of single threads, if there is not at least 100 threads, the entanglement will not be sufficient and the number of small closed loops must be smaller than the average outer diameter of the sewing thread.For closed loops that exceed the average outer diameter of the sewing thread, there will be bell-coupling between the sewing threads. It is necessary to have at least 1,000 pieces/m even if only the parts protruding from the surface are present. If it is less than this, the sewing thread will have poor binding properties and will be prone to opening due to repeated stretching of the sewing thread. Preferably it is 10,000 pieces/m or less. In addition, the number of closed loops is 10c of sewing thread when viewed under a magnifying glass with a magnification that corresponds to the thickness of the sewing thread! It is obtained by counting the number of closed loops protruding from the surface of each sewing thread. In the present invention, the closed loop sewing machine thread Y
There are an infinite number of closed stitch loops l, and the number of closed stitch loops l is 1000 for the average outer diameter JK of sewing thread Y.
There are more than m.

Figure 2 is an explanatory diagram of closed and open eyes (A).

(B) is a closed eye; (C), (D), and (E) are open eyes; 9. (a) is a side view, (b) is a side view seen in the direction of the arrow in Ca), and 2 is a filament. FIG. 3 shows a conventional fluid-separated yarn, in which the protruding length 13 of the loop 3 protruding from the surface of the yarn Y' is also the outer diameter of the loop! 4 exceeds the average outer diameter j' of the kneaded yarn Y'.

When the conventional fluid-separated yarn shown in FIG. 3 is used as sewing thread, a Velcro phenomenon occurs.

Next, an example of the method for manufacturing sewing thread of the present invention will be briefly described. FIG. 4 shows an example of a manufacturing apparatus. In the figure, a synthetic fiber filament group Y consisting of a predetermined number of monofilaments is fed by a feed roller 4 to a fluid agitation nozzle 5, where it is subjected to fluid agitation treatment. Overfeed rate s
The ratio (%) is preferably 5 to 15q6. Subsequently, it is sent to a loaf 6.7 and heat-treated by a heater 8 between rollers 6 and 7 under underfeed. The heat treatment temperature is lower than the melting point (melting point -100)"C or higher. The underfeed rate F2 is preferably 0 to 5%. Also, the relationship between the overfeed rate F1 and the underfeed rate F2 is IFII>lF21 This is a cross-sectional view of the package 9 and the winding 5 after heat sensitization and post-mortem treatment.

(Example) Example 1 Six raw yarns of polyester 1v50 denier/v48 filament were arranged and supplied to the fluid disturbance nozzle shown in Figs. 4 and 5.
Fluid disturbance treatment was performed at a compressed air pressure of 5.5 kt/d and an overfeed rate of 10%, followed by 20% underfeed of 3%.
A processed yarn was produced by passing it through a heater at 0° C., and the processed yarn was wound into a package.

After that, I dyed the polyester yarn as usual, applied a silicone finishing oil, and finished winding it onto a bobbin with a collar for sewing machine thread.

This yarn has a single yarn of 1.04 denier and has 28 yarns.
Observe the 8 threads with a 9.30x magnifying glass and find that there is a closed loop of about 1/3 of the outer diameter of the thread for every 103 length of the thread.
250 pieces can be counted just from the ones that protrude from the surface h 1m
Right! It is thought that there are over 51,000 of them.

Use this thread as needle thread for Singer 770DI lockstitch sewing machine.
Aesthetic Iv striped mix 65/min at rotation speed 3000.181 revolutions/min
When I sewed 2m lengths of 4 layers of 35 Twi Y working fabric, there were no eye gaps at all.

Example 2゜ Three yarns of polyester 100 denier/I/36 fiber were aligned, DuPont XIV manufactured by Precision, USA
The processed yarn obtained after being supplied to a mold fluid agitation nozzle, subjected to fluid agitation treatment at a compressed air pressure of 5.5 cm/- and an overfeed of 10%, and then passed through a heater plate at 200°C under an underfeed of 3%. rolled up in a package. After that, I dyed the polyester yarn as usual, applied a silicone finishing oil, and finished winding it onto a bobbin with a collar for sewing machine thread.

The yarn has a single yarn of 28 denier and consists of 108 yarns, and when the yarn was observed with a 30x magnifying glass, the closed loop, which was about 1/2 of the outer diameter of the yarn, was 1OcN long. 120 pieces were counted just from the ones that protruded on the surface, and it was e1m, D
It is thought that there are over 1000 of them.

Use this thread as needle thread for Singer 770DI lockstitch min.
When I sewed 4 layers of Esthetic YVM blend 65/35 Twi Y Working fabric at a rotation speed of 3,000 rpm to a length of 2 m, there was no occurrence of any stitching.

Comparative Example 1 Two yarns of polyester/L/150 denier 1v30 filament were aligned and processed in the same manner as in the example.

This yarn has a single yarn of 5 deni-y and consists of 60 yarns.
When the threads were observed with a 30x magnifying glass, there were 70 closed loops that were approximately the same size as the outer diameter of the thread body and were protruding from the surface of the thread body over a length of 10 cfR. I tried using the same lockstitch sewing machine, but the thread broke so I couldn't make 2 meters of continuous i-sewing.

Comparative Example 2゜Polyester A/100 Deny A/30 filament was first twisted at 750T/M in the S direction using an Italian twisting machine, then three of these were combined and twisted at 500T/MO in two directions.1 Normal polyester After dyeing the yarn, apply silicone finishing oil and finish winding it on a bobbin with a collar as φ40 min thread.

Although the upper twist and lower twist were balanced and the yarn had a twisted yarn shape, it had no torque as a yarn. When this thread was sewn under the same conditions as in the example, the tension washer was used to sew the thread.As a result, it was possible to sew a length of 2 m, but when the sewing machine was stopped, the thread was twisted between the tension washer and the sewing thread bobbin, resulting in a rounded snarl. This occurred and the snarl got caught in the guide, making it impossible to continue sewing.

(Effects of the Invention) According to the present invention, a twisted yarn structure is not used, no twisting movement occurs due to coral in the tension washer, and the thin Velcro effect allows for easy removal of yarn waste, resulting in improved sewability. Good sewing thread was obtained.

Since the size of the closed loops of this sewing thread is minute, the closed loops bite into each other.

There is less occurrence of sagging, etc. Even when yarn layers are stacked and wound onto a bobbin, the yarn separates easily during unwinding, allowing for smooth unwinding.It improves the sewing performance of conventional fluid-type yarn, and naturally does not have a twisted yarn structure. Therefore, even with high-tension ironing on the sewing machine, there was no tearing caused by the twisting seams, which was excellent.

The figure is an explanatory diagram of closed loops and open loops, the third figure is a side view of a conventional sewing thread, the fourth figure is a side view of the machine for manufacturing eight sewing threads of the present invention, and the fifth figure is a side view of a conventional sewing thread manufacturing apparatus. FIG. 5 is a cross-sectional view of the fluid disturbance nozzle of FIG. 4;

1...Closed eyes loop 2...Filament 4...Feed roller 5...Fluid disturbance nozzle 6.7・・・・・・Roller 8... Heater.

Claims (1)

[Claims] Synthetic fiber filament sewing thread consisting of 100 or more monofilaments of 0.5 to 30 deniers, in which closed loops exist inside and outside the sewing thread, and the outermost diameter of the loop forming the closed loop, or the sewing thread The protruding length of the loops protruding from the surface of the sewing thread is less than or equal to the average outer diameter of the sewing thread, and the number of closed loops is 1000 threads/m or more, and the loops and the monofilament are entangled and intertwined. Sewing thread characterized by being tightly bound and focused.