JPS62177285A - Production of 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] [Industrial application field] The present invention relates to a method of manufacturing sewing thread.

[Conventional technology]

Since sewing thread is subjected to strong force as the sewing needle moves up and down, it is required to be a thread that is sufficiently stronger than ordinary thread to avoid thread breakage. Therefore, as shown in Figure 10, general sewing thread is made by combining multiple threads produced by a spinning machine and twisting them to make a strong thread, which is then dyed in the desired color and then used for sewing machine bobbins. It is manufactured by winding it up. Further, as the above-mentioned spun yarn, ring spun yarn is used, which is said to have the highest yarn strength compared to other spun yarns.

(Problems to be Solved by the Invention) As mentioned above, it is impossible to use spun yarn as a single yarn as sewing thread in terms of yarn strength. Then, it is necessary to go through the time-consuming process of doubling these yarns and twisting them again, resulting in a problem of high manufacturing costs.The present invention aims to solve this problem.

According to the observations of the present inventor, when conventional sewing thread is used as a single thread, thread breakage occurs in the sewing process as follows.

That is, as shown in FIG. 11, as the sewing needle (1) moves up and down, the sewing thread (2) is squeezed by the edge of the needle hole (3) through which the thread (2) is passed, and at this time, the sewing thread (2) ), one side (2a) is strongly twisted and the other side (2b) is in a condition of stringing, and the fibers in the stringing part (2b) are pulled out, causing yarn breakage. In the figure, (4) is a cloth to be sewn by a sewing machine, and the figure shows the cloth (4) being fed in the direction of arrow (5). As mentioned above, since conventional sewing thread is ring-spun thread, it has a real twist as shown in Figure 12, and therefore has strong thread strength, but when it is untwisted in one direction and made into a selvedge. Fibers easily come off.

The present invention was achieved as a result of such observations.

[Means for solving problems]

As shown in Fig. 1, the present invention produces single-filament sewing thread by dyeing bundled spun yarn as a single yarn without going through a doubling process or the like, and then attaching a resin to the spun yarn. be.

[Effect]

The above-mentioned bound spun yarn (Yl) has a structure in which wrapped fibers (f2) are wound around a substantially untwisted core fiber (fl), as shown in FIG. Most of them are characterized by protruding in one direction. Therefore, when this thread (Yl) is twisted in the direction of the arrow as shown in Figure 3, the wrapped fiber (f
In 2), the core fiber (fl), which was not twisted, is loosened but twisted.

Furthermore, when the yarn (Yl) is twisted in the opposite direction as shown in Figure 4, the winding of the wound fiber (f2) becomes stronger and the core fiber (fl
) twists are also formed. Therefore, the yarn (Yl) as a whole does not become a lint, and fibers are less likely to come off. However, when this bound spun yarn (Yl) is squeezed in the direction of the arrow as shown in FIG. ) is pulled in the opposite direction to its protrusion direction, so that a small nep (10) is formed. As a result, the yarn (vl) does not run smoothly and gets caught or clogged in the needle hole (3), causing yarn breakage.
As shown in FIG.
is strongly adhered to the periphery of the core fiber (fl) or the wrapped fiber (f2) due to the adhesion force of the resin, and is not easily peeled off even with some hardening.

〔Example〕

FIG. 7 schematically shows an apparatus for producing bundled spun yarn (Yl). The untwisted sliver (S) pulled out from the can (K) and finished by the drawing machine is introduced into the spinning nozzle (12) through the draft device (11), becomes a bundled spun yarn (Yl), and is sent to the delivery roller (13). After the package (Pl) is pulled out by the friction roller (14), the package (Pl
).

In Fig. 8, the spinning nozzle (12) is a sliver (S).
Two air injection nozzles (Nl) each eject compressed air streams swirling in opposite directions as shown by the arrows.
(N2). The sliver (S) introduced into the spinning nozzle (12) is transferred to the second air injection nozzle (N2)
The false twist is propagated on the sliver (S) and the front roller (1) of the draft device (11)
6) Reach close. Also, false twisted sliver (S)
is ballooned by the first air injection nozzle (N1) in a direction opposite to the direction of twist. Front roller (16
), the sliver (S) immediately after leaving the fiber in its center (
The sliver (S) in this state is subjected to a false twisting action, and the fibers (f2) near the end are not false-twisted and are wrapped around the other fiber (fl) by the balloon. 2
When it passes through the air injection nozzle (N2), it is untwisted,
The fibers in the center return to a non-twisted state and become core fibers (fl),
The fibers wrapped around it are wrapped even more strongly to become wrapped fibers (f2), and thus become one bound spun yarn (Yl
) is manufactured.

The heating force by the second air injection nozzle (N2) must be stronger than the heating force by the first nozzle (N1) because it is necessary to overcome the heating force by the first nozzle (N1) and propagate the twist. However, strong binding spun yarn (Y
1), the heating powers of both nozzles (Nl) (N2) need to be set at a ratio within an appropriate range. According to experiments, in order to obtain strong thread (Yl), both nozzles (Nl)
It is recognized that it is preferable to set the ratio of the injection forces of (N2) to N1:N2=374.

The bound spun yarn (Yl) thus produced is wound into a package (Pl) shape with a tension suitable for dyeing in the subsequent process. Dyeing is performed by dipping the yarn (Yl) as a package (Pl) into a dye solution, and then it is dried and sent to the resin processing step described below.

In FIG. 9, the bound spun yarn (Yl) that has undergone the dyeing process is pulled out from the pan cage (Pl) and the resin (R) tank (1
7) It passes through the inside, and further passes through the dryer (18) and is wound up as a package (P2). Thread at this time (Yl)
It is preferable that the running direction is the direction in which the fluff (f3) is laid down, that is, the yarn is run in the direction of the arrow in FIG. The resin (R) is cured by passing through the dryer (18), and by fixing the fluff (f3) and other fibers (fl) (f2) to each other, it prevents the fluff (f3) from raising due to ironing. At the same time, it acts to improve the strength of the thread (Y2) as a whole. Therefore, the resin (R) may be any resin as long as it can exhibit such an effect, and for example, a polyurethane-based, silicone-based, or polyester-based polymer resin is used in the form of a solution. In addition to the dipping method shown in the figure, the solution may be applied to the thread (Y2) by a spray method, a roll coating method, or a method in which the package (Pl) is immersed in the solution.

The thread (Y2) to which the resin has been applied as described above is then pulled out from the puff cage (P2), finished wound around a sewing machine bobbin (not shown), and used as sewing thread.

Attachment 8 to resin (R) thread (Y2)! The ratio is preferably about 2 to 10%, more preferably about 3 to 5%. The larger the amount of resin adhered, the higher the yarn strength, but it is not preferable to adhere too much because the flexibility of the yarn (Y2) will be lost.The relationship between the amount of resin adhered and the strength and abrasion resistance of the yarn (Y2) is This is shown in the graphs shown in FIGS. 13 and 14.

In the experiments to create these graphs, Ne30 bound spun yarn and polyester resin were used, and in the abrasion resistance experiment, one end of the yarn (Y2) was fixed in the apparatus shown in Figure 15, and the other end was fixed. A weight was attached to the disc to measure the number of times the disc (D) could be rotated in the direction to cause fuzz (f3) before uncutting occurred. In these experiments, a yarn (Yl) with relatively low yarn strength was used so that the improvement in yarn strength due to resin adhesion would be noticeable, but the same tendency would occur even when yarn (Yl) with high yarn strength was used. . In addition, it is effective to make the original bound spun yarn (Yl) as strong as possible in ironing to further improve the quality of the final sewing thread (Y2). As shown, it is preferable to arrange a predetermined sliver guide (21) between the back roller (I9) and the middle roller (20). However, in order to obtain a thread that is resistant to ironing, the inner width (W) of the exit portion is set as follows. That is, when manufacturing a conventional normal thread, W = 51 m when the thread is Ne20, and W = 51 m when the thread is Ne30.
= 3 m, but if you want to obtain a thread that is strong against ironing, use Ne
20, W=8~9 M, Ne30, W=
6 to 7 ms, and by increasing W, the ratio of the wrapped fibers (f2) is increased. Moreover, if the thread (Y2) obtained by the present invention is further oiled, the needle hole (
3) The slippage against the yarn is further improved, and the possibility of thread breakage is further reduced.

〔Effect of the invention〕

According to the present invention, one sewing thread can be manufactured from one bundled spun yarn, so compared to the conventional method of twisting and twisting multiple threads, there is less twisting and the manufacturing cost is significantly reduced. can be done.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the method of the present invention, FIG. 2 is a diagram showing a bundled spun yarn, FIGS. 3 and 4 are diagrams showing the state when twisting is applied to the bundled spun yarn, and FIG. 5 6 is a diagram showing the yarn obtained by the present invention. FIGS. 7 and 8 are diagrams showing the method for producing the bundled spun yarn. Figure 9 shows the resin adhesion process in the present invention, Figure 10 shows the conventional sewing thread production method, and Figure 11 explains the problems when using ring spun yarn as a single thread as sewing thread. diagram for,
Figure 12 is a diagram showing ring-type spun yarn, Figures 13 and 14 are graphs showing improvement in yarn quality due to resin adhesion, Figure 15 is a diagram showing the apparatus used for the abrasion resistance test, and Figure 16 FIG. 2 is a plan view showing a sliver guide. (R) - Resin (Yl) - Bundled spun yarn (Y2
)... Sewing thread obtained by the present invention Fig. 12 Fig. 11

Claims (1)

[Scope of Claims] A method for producing sewing thread, which comprises dyeing bundled spun yarn in the form of a single yarn, and then attaching a resin to the yarn to obtain a single sewing thread.