JPS5911699B2 - sewing thread - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved suture comprising filament fibers.

Various kinds of sewing threads have been known in the past, and among them, threads made of spun threads and threads made of filament fibers are most prominent, and are still in use in large quantities, but these threads suffer from various defects. It is something that is inherent.

For example, spun yarn inherently has uneven thickness,
There are large fluctuations in thread strength, resulting in defects such as thread breakage during sewing and the beauty of sewn products.

On the other hand, for some reason, filament fiber sewing threads are more difficult to sew than spun threads (generally speaking, it is better to have fluff in the threads).

There have been many attempts to form fluff or fluff-like protruding fibers in filament fiber sewing threads, but at present there are few that satisfy the mechanical properties required for sewing threads.

Furthermore, the present inventor previously proposed the technology that is the basis of the present invention in Japanese Patent Application No. 54-32264.

In this prior application, the filament false twisted yarn is formed with protruding fibers so as to have a shape similar to the fuzz of spun yarn.
It uses a single thread and is ideal for overlock stitches (overlock stitches).

In other words, if a single thread is used, the thread becomes flat after sewing and the constituent fibers are opened and arranged, resulting in good covering properties.
It is possible to effectively prevent the fabric from fraying at the cut portion.

However, when the sewing thread of the prior application example is used in areas that appear on the appearance of sewn products such as lock stitches and stitch stitches, the constituent fibers are somewhat lacking in cohesion, so the stitching effect and beauty of the seams are not satisfied, and the stitching There were problems in that it lacked durability and high-speed sewing performance.

There was a desire to improve the technology of the prior application.

In view of the above-mentioned conventional situation, the present inventors conducted extensive research and as a result, they came to provide a sewing thread according to the present invention.

The gist of the suture of the present invention is as follows.

In other words, each single yarn that constitutes the optic fiber is a twin or triple yarn in which the first twist and the second twist are twisted in a substantially balanced manner.
It is a false-twisted thermoplastic fiber multifilament yarn, in which all the constituent filaments have substantially the same length, and there are yarn parts in which the constituent filaments are intertwined with each other along the yarn axis, and yarn parts in which they are not intertwined. and has filament portions protruding from the yarn axis in an arcuate, annular or/and twisted shape, and the protruding filament portions are intermittent entanglements in each of the single filaments. This sewing thread is characterized in that it is strongly constrained and fixed by the action of the first twist and first twist.

The sewing thread of the present invention will be explained in more detail.

The sewing thread of the present invention is a twin or triple thread in which the first twist and the first twist are twisted in a substantially balanced manner, and has a basic twisted structure as a sewing thread.

Each single yarn constituting the sewing thread of the present invention is a false-twisted thermoplastic fiber multifilament yarn, and the false-twist crimp of each filament reduces the coefficient of friction with metals and other substances. In addition to improving sewability, this is an extremely important property for forming protruding fibers, which will be described later.

Each single thread constituting the sewing thread of the present invention has a filament portion protruding from the thread axis, which is formed from a portion of the constituent filaments and has an arcuate shape, an annular shape, and/or a twisted shape. The protruding filament portions are also present on the surface, and these protruding filament portions give the yarn-like appearance and performance.

Each of the single threads constituting the sewing thread of the present invention alternately has thread parts in which the constituent filaments are intertwined with each other along the thread axis, and thread parts in which the constituent filaments are not intertwined. Bind and fix the filament part.

This entanglement, the first twist, and the second twist combine to make the binding and fixation of the protruding filament portions of the sewing thread nearly perfect.

Incidentally, the intermittent entanglement according to the present invention forces the filaments to shift in the yarn axis direction, and has a strong force that binds and fixes the protruding filament portions.

According to the findings of the present inventors, it seems preferable that the average length of the unentangled thread portion be 3 threads or more and 20 threads or less.

Furthermore, all constituent filaments of each single yarn constituting the sewing thread of the present invention have substantially the same length, thereby increasing the strength utilization rate of the constituent filaments of the sewing thread.

For example, the sewing thread of the present invention made of polyester filaments can generally achieve a thread strength of 4 g/D or more, and if a high IVO thread is used, it is also possible to achieve a thread strength of 5 to 6 g/D.

Furthermore, even if the yarn is subjected to the (Ig/D tension application--tension removal) test 10 times, the optical distortion (elongation rate relative to the yarn length) is extremely small, at less than 3 to 2 inches.

In the sewing thread of the present invention, the protruding filament portion is
It seems that the effect is greater when there are 100 or more, preferably 150 or more, per meter of yarn.

The method for manufacturing the single yarn constituting the sewing thread of the present invention is to false-twist thermoplastic fiber multifilament yarn and then process it with a fluid jetting device having an intermittent entangling action.

The protruding filament portion is mainly loosened after false twisting, and conveniently, the filament is fed to the fluid injection device with a high overfeed, and by forming a relaxed state on the upstream side of the fluid injection device, the filament is crimped by the filament crimping force. It is formed by forming a protruding filament part by itself and binding and fixing the protruding filament part in a subsequent interlacing process.

Therefore, even though the single threads constituting the sewing thread of the present invention have protruding filament portions, all the constituent filaments are essentially of equal length.

The crimp force of the filaments forming this protruding filament portion depends on the false twisting conditions, but is mainly influenced by the number of false twists.

If the number of false twists is small, the crimp will be large and a large protruding filament portion will be formed, but at the same time the crimp force will be weakened, and if the number of false twists is even smaller, no protruding filaments will be formed.

On the other hand, if the number of false twists is large, the crimp force will be strong, but the crimp will be finer, the protruding filament portions will be formed finely, and eventually no protruding filament portions will be formed.

The preferred number of false twists and relaxation rate to form the protruding filament portion are 2000(T・(D/ρ)′/4<70004<((
V2/V3) 1)X100 (20.

Here, D is the denier number of the multifilament yarn to be false twisted, ρ is the specific gravity of the fiber, T is the number of false twists per meter of yarn,
v2 is the take-off speed for false twisting, and V3 is the take-off speed for entanglement.

The above false twisting process has a lower number of false twists than normal false twisting process,
The filament can be processed to have high strength, low elongation, and little heat shrinkage, and can be said to be the most suitable process for sewing thread.

The sewing thread of the present invention is suitable as an industrial ground sewing thread, a household sewing thread, and a household hand sewing thread.

That is, in the present invention, since the first twist and the first twist are twisted in a substantially balanced manner, the twin or triple thread is twisted, so the thread has good cohesiveness and convergence, and high-speed sewing is possible.

In addition, the beauty of the seams, the stitching effect, and the seam durability effects can be obtained.

Next, since all the constituent filaments have substantially the same length, the yarn strength utilization rate can be increased, and the beauty of the seams and the stitching effect are further enhanced.

Next, since the protruding filament portions are bound and fixed by interlacing, first twisting, and final twisting, the protruding portions do not disappear even when strong tension is applied, and an appearance and sewing performance similar to that of spun yarn can be obtained.

Furthermore, since the constituent filaments have alternately intertwined portions and unentangled portions, even if the constituent single fibers were to break, they will stop at the intertwined portions and will not form yarn clumps.

Example 1 A multifilament yarn (100D-48fil) made of polyethylene terephthalate was false-twisted 1500 times.
False twisting was carried out at a false twisting temperature of 200° C. at a false twisting temperature of 200° C., and then an intermittent fluid jet entangling treatment was performed in a 14-inch overfeed area.

The resulting multifilament yarn had 800 entangled sections per meter, the average length of unentangled yarn sections was 8 mm, and 200 protruding filament sections were easily counted per meter of yarn.

This yarn was twisted 750 times/m in the S direction, then three yarns were combined and twisted 500 times/m in the Z direction.

Next, heat setting was performed at 220°C for 1 second while applying 1 inch of elongation, and then dyed in a water bath at 130°C.
Next, wax was applied to make a sewing thread.

This sewing thread was superior to conventional products in terms of sewability and the beauty of sewn products.

Example 2 A multifilament (50D-24fil) made of polyethylene terephthalate that had been false-twisted in the S direction and one that had been false-twisted in two directions were aligned and subjected to intermittent fluid jet entangling treatment.

Next, twisting was performed at a rate of 750 times/m for the first twist and 500 times/m for the triple twist.

The fabric was then dyed in a water bath at 130°C and then waxed to form a sewing thread.

This yarn was also excellent like Example 1.

Example 3 Example 10 A sewing thread was made in the same manner as in Example 1 except that two threads were used instead of three threads.

When this sewing thread was evaluated for sewability as shown below, the number of thread breaks was 0. The number of skipped stitches was 1, and the sewing performance was extremely excellent.

Moreover, the yarn strength was 4.2 g/d.

Furthermore, the appearance is beautiful and excellent.

Sewability evaluation measurement method Sewing machine Singer 281-1 Lockstitch needle Singer 1955 $11 Number of stitches 5450 times/mi
n Number of stitches: 15 stitches/3CW & Fabric: Cotton broadcloth #40 Sewing was performed for 20m under conditions of 9 or more pieces, and sewing defects were examined.

Comparative Example I False twisting was performed in the same manner as in Example 1 using a two-spindle false twisting system in the S direction and in the two directions, and then the two yarns were pulled in the 14% excess feed range. After the yarns were aligned, they were subjected to an intermittent fluid jet entangling treatment to obtain a 200D-96fil yarn with no twist and no torque.

Next, the same treatment as that after twisting in Example 1 was performed.

This yarn corresponds to the single-filament structural yarn of Example 3 with the twist removed.

The yarn strength of the obtained yarn was 4.0 g/d, and Example 3
Furthermore, in the same sewability evaluation as in Example 3, the number of thread breaks was 41 and the number of skipped stitches was 463, and the sewability was poor in lock stitching.

Furthermore, there was a lot of fluffing in the threads in the sewn parts, and the appearance was poor.

Comparative Example 2 In Example 2, the false-twisted yarn in the S direction was supplied in excess of 4% and the false-twisted yarn in the two directions was supplied in excess of 14% and pulled together, and then subjected to intermittent fluid jet entangling treatment.

Next, twisting was performed at a rate of 150 times/m of first twist/m and 500 times/m of final twist, and thereafter the same treatment as in Example 2 was performed.

This yarn is a double yarn of 100D/48fil and lacks iso-benignity compared to the yarn of Example 3.

The strength of the obtained yarn was 2.8 g/d, which was significantly lower than that of Example 3.

This is because the strength utilization rate is low because the filaments are not of equal length.

Further, when the same sewability evaluation as in Example 3 was performed, the number of thread breaks was 38 and the number of skipped stitches was 662, indicating that the sewability was poor.

This is due to the fact that there were a large number of wrinkles that occurred during twisting, and the yarn frequently got caught in the needle holes.

Claims (1)

[Claims] 1. The first twist and the first twist are twisted in a substantially balanced manner.2
It is a child or triple child yarn, and the constituent single yarn of eye light is a false twisted multifilament yarn, and all the constituent filaments are substantially the same length, and the constituent filaments are intertwined with each other along the yarn axis. It has yarn portions and non-entangled yarn portions alternately, and has a protruding filament portion such as an arcuate, annular or/and twisted shape protruding from the yarn axis, and the protruding filament portion is A sewing thread characterized in that it is bound and fixed by intermittent interlacing in single threads and the first twist and top twist.