JPS5930928A - Yarn entangling treatment - 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 relates to a yarn entanglement treatment method for intermittently intertwining yarns, and more specifically, the present invention relates to a yarn entanglement treatment method for intermittently intertwining yarns. The present invention relates to a yarn intertwining method in which intertwined portions are alternately provided.

Conventionally, so-called entanglement processing, in which a fluid is applied to the running yarn to intermittent entangle the yarn, has been widely used.The purpose of this treatment is to improve the winding properties of the yarn and to improve the unwinding property. There are a wide range of improvements, such as blending multi-filament yarns, omitting the twisting and sizing processes, etc.

Generally, the number of intertwined portions per unit length of the intertwined yarn (hereinafter referred to as the number of intertwined points) is required to be around 11,050 when used, for example, as the warp of a textile.

However, as the table shows, with the recent increase in processing speed, the speed of the interlacing process has also increased, and the number of entangled points of yarn obtained by increasing the speed of the interlacing process is much larger than the 50 pieces/m. Therefore, when such threads are used in textile applications, single fiber breakage occurs on the loom, causing problems such as lowering the operating rate of the loom.

Therefore, it is extremely important to maintain the number of entangled points above a certain value regardless of changes in processing conditions. In order to maintain the number of entangled points above a certain value, it is especially important to increase the number of entangled points under high-speed processing. A common method is to change the pressure of the fluid injected (for example, see Japanese Patent Publication No. 54-43628).

However, although this method slightly increases the number of intertwined points, it is extremely small. At the same time, since there are long unentangled portions (hereinafter referred to as missing portions), troubles such as single fiber breakage are likely to occur when used as warp yarns of woven fabrics as described above.

The present invention has been made in view of the above-mentioned problems, and its purpose is to significantly increase the number of intertwining points even during high-speed intertwining processing of yarn, and to reduce the number of intertwining points at that time. It is an object of the present invention to provide a method for interlacing threads with extremely few omissions.

As a result of intensive study to achieve this objective, the inventor has found that
The present invention was achieved based on the discovery that when heated fluid is injected onto a running yarn in a nozzle, the resulting yarn has fewer entanglements and an increased number of interlace points.

That is, the present invention provides an interlace nozzle in which a fluid is injected from the nozzle wall onto a yarn running through an interlacing nozzle to alternately provide spread portions and entangled portions in the length direction of the yarn. Maintain the yarn overfeed rate below 10%,
Moreover, the yarn entanglement processing method is characterized in that the ejected fluid is a heating fluid.

The invention will be further explained with reference to the drawings.

FIG. 1 is an enlarged view showing the state of intertwined yarn. In the figure, t' indicates the length of the spread part (spread part), t' indicates the length of the interlaced part (interlaced part), and L indicates the interlacing pitch.

FIG. 2 is a frequency graph showing the distribution of spread portions t' per unit length.

0) and (b) in Figure 2 are the distributions of the spread portion t' shown in Figure 1 for yarns obtained by changing the jetting fluid temperature while keeping the yarn running speed, fluid jetting pressure, and yarn tension constant. In the case of (a), a heated fluid was used as the injection fluid, and in the case of (b), a room temperature fluid was used as the injection fluid.

Here, since the variation of the spread part t' of the yarn 0) is smaller than the variation of the yarn of (B), the yarn of (A) is
It shows that there is less lack of entanglement than the yarn in (b).

By using the heated fluid as the injection fluid in this way, the number of missing entanglements can be greatly reduced, and as a result, the number of entanglements can be increased.

Next, the principle of reducing the number of missing entanglements and increasing the number of entangled points by injecting a heated fluid as in the present invention will be explained.

Generally, when a fluid is injected onto a yarn in a nozzle to impart entanglement, the entanglement is imparted by the following mechanism.

(1) The fluid jet opens the yarn passing through the nozzle.

(11) Due to the turbulent flow, the individual single fibers begin to swirl in the respective lateral directions.

GID The rotation is fixed at the point where the friction force between the single fibers meets the comb, and an intertwining point is formed.

Therefore, if the swirling motion of the single fibers is made more vigorous than before, the number of missing entanglements will be reduced and the number of entangled points will increase, as shown in FIG. 2(a).

5- In order to increase the swirling motion of monotonic fibers, (a) Increase the flow velocity of the jet stream injected onto the running yarn.

(b) Improving the spreadability of the yarn to which the fluid has been jetted.

This is important, and can be achieved by using a heating fluid as the injection fluid as in the present invention.

In other words, since the flow velocity of this jet has already reached the speed of sound,
Below [Formula 11 (Chemical Engineering Handbook, Revised 4th Edition, Page 137)
As shown in (see), simply increasing the injection pressure does not make the flow velocity higher than the sonic velocity, but if the injection fluid is a heated fluid, the jet flow velocity can be increased accordingly.

``!+a=+ Moreover, by injecting the heated fluid onto the yarn, the yarn is plasticized, the Young's modulus of the yarn is reduced, and the spreadability is also improved.

The effects of (a) and (b) combine to make the above-mentioned swirling motion of the single fibers more intense, and the resulting yarn has a few missing yarns as shown in Figure 2 (a). (The number of confounding points increases.)

The heating fluid referred to in the present invention may be air or an inert gas such as nitrogen, and the temperature of such fluid is preferably 100°C or higher, particularly preferably 100°C to 300°C.

In addition to the use of a heating fluid, an even more important point in the present invention is that the overfeed rate of the yarn supplied to the entangling nozzle can be reduced to 1.
The purpose is to inject the heating fluid onto the yarn at a temperature of 0% or less.

Here, if the overfeed rate of the yarn becomes greater than 10 inches, the resulting yarn will be undesirably thick and have loops or tangles.

As the entangling nozzle used in the present invention, any entangling nozzle (for example, see Japanese Patent Publication No. 36-12230, Japanese Patent Publication No. 4-1175, etc.) can be used.

Further, as the yarn to be subjected to the entanglement treatment method of the present invention, it is preferable to use polyester, polyamide, acetate, which is plasticized and opened by the above-mentioned heated fluid.

As described above, according to the yarn entanglement treatment method of the present invention, a yarn can be obtained with fewer missing entanglements and a large number of interlace points.

Therefore, by using intertwined yarns that span the warp of a woven fabric, the aforementioned problems caused by single fiber breakage on the loom or deterioration in the quality of the woven fabric can be solved.

The present invention will be explained in more detail with reference to Examples, and the drawn yarn of Example 75 de/36 fil was published in
Using the yarn entanglement processing device shown in Figure 38 of Publication No. 1175, the yarn running speed, yarn tension entering the device, compressed air pressure, compressed air temperature, and overfeed rate (OF rate) are shown in Table 1.
Interlaced yarns were obtained by making various changes as shown below. The number of intertwined points and omission rate of such interlaced yarns were measured, and the results are also shown in Table 1.

Similarly, the missing rate is calculated using the following formula.

9- In Table-1, A2-5. In case of No. 14.421, the temperature of the injection pressure air is room temperature, so even if the pressure of the air pressure is increased, the increase in the number of entangled points is extremely small.

On the other hand, boiled 6-13. Ya15-20. &22~2
In No. 7, since the injection pressure air is heated pressure air, the number of intertwining points can be increased without changing the pressure of the air pressure, and the omission rate is also reduced.

Further, although heated and compressed air was used in &1, the overfeed rate exceeded 10 yen, so the obtained yarn had large loops and tangles.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged view showing the state of intertwined yarn, and FIG. 2 is a frequency graph showing the distribution of spread portions per unit length. t′: Length of the spread portion (spread portion) t″2 Length of the interlaced portion (length of the interlaced portion) 0): Spread portion distribution of the present invention (b): Spread portion distribution of the conventional method Patent applicant Teijin Ltd. Company agent Patent attorney former 1) Jun Hiroshi 11- Ketsu brother En L/

Claims (2)

[Claims] (1) Interlacing: When providing spread portions and interlacing portions alternately in the length direction of a multi-filament yarn by injecting fluid from the nozzle wall to the yarn traveling through an interlacing nozzle, A yarn entanglement treatment method characterized by maintaining a yarn overfeed rate at 10% or less and using the jetted fluid as a heating fluid. (2) The yarn entanglement treatment method according to claim (1), wherein the heated fluid temperature is 100° C. or higher.