JP2907882B2 - Interlace nozzle - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an interlace nozzle for imparting excellent blending / entanglement to a multifilament yarn, particularly a thick denier multifilament yarn.

(Prior Art) A conventional interlaced yarn is directed to a multifilament yarn running in a nozzle, and simply collides with a pressurized air flow to impart entanglement, thereby reducing a twisting process or omitting the process. In recent years, interlace processing has been highlighted as a powerful means for obtaining a color tone mix of filament yarn, especially in the field of thick denier, and various advantageous nozzles have been developed for that purpose. (Japanese Patent Publication No. 59-33694, 61-5)
No. 7424).

(Problems to be Solved by the Invention) As described above, the conventional interlacing is mainly used as a rationalizing process for reducing or omitting the twisting process and as a powerful means for obtaining a color tone mixing effect of the filament yarn. However, in recent years, its application to interior (carpet) and industrial materials has been rapidly spreading. These processed yarns used for interiors and industrial materials generally have large denier.

However, the conventional interlace nozzle for obtaining a thick denier interlace yarn is simply an enlarged one for fine denier, or the flow of processing air ejected by air jet is caused to flow in a direction opposite to the yarn traveling direction. Thus, the generation of loop fluff caused by disturbing the fibers by the discharge flow is excluded from consideration. However, in order to stably obtain dense and strong confounding, extremely high pressure is required or a large amount of air flow must be consumed. Due to the generation and increase of the air flow, the production cost has risen.

An object of the present invention is to solve the problems of the conventional nozzle described above, and can effectively use the jet flow and eliminate the influence on the yarn due to the discharge flow, and can reduce the intensity of the yarn. The generation of noise due to vibration can be significantly reduced.
It is intended to provide an interlace nozzle.

(Means for Solving the Problems) In order to achieve the above object, the present invention sequentially has a yarn introduction portion, a nozzle portion, and a yarn take-out portion having an inner diameter smaller than that of the yarn introduction portion. In the interlace nozzle in which the high-pressure air injection port is opened and the discharged air flow is in the opposite direction to the running direction of the yarn, the yarn is introduced from the outside through the yarn introduction section to just before the high-pressure air injection port. The point is to insert a pipe.

(Operation) As is well known, the relationship between the pressurized air and the yarn in the interlace nozzle is as follows.

The pressurized air ejected from the high-pressure air injection port collides with the running yarn, vibrates the yarn while giving the yarn a confound, and alternately forms the entangled portion and the spread portion. The air after the above operation is discharged from the nozzle opening, but the running yarn is stretched toward the nozzle inlet side by the discharged air inside the nozzle. This is particularly true for nozzles of the type in which the inside diameter of the yarn take-out section is smaller than the inside diameter of the yarn insertion section and a large amount of air is discharged in the direction opposite to the running direction of the yarn (toward the yarn introduction section). The trend is remarkable. At this time, the force of the large amount of exhaust air damages the single fiber and causes fluff or loosening,
Alternatively, the yarn may fluctuate in tension, degrade the quality of the interlaced yarn, destabilize entanglement, and generate significant noise due to severe vibration of the yarn at the yarn introduction section.

The present invention eliminates the influence of the air resistance on the yarn due to the discharged air, prevents defects added to the yarn, stabilizes the yarn tension, stabilizes the confounding, and further reduces noise. Is to be reduced.

Hereinafter, the present invention will be described in further detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a typical nozzle shape example of the present invention, in which a yarn introduction portion 1, a nozzle portion 2, a yarn take-out portion 3,
It comprises a high-pressure air injection port 4 opened to the nozzle portion, and a yarn introduction pipe 6 for separating the traveling yarn 5 from the discharged air flow.

The nozzle shown in FIG. 1 is characterized in that the opening area of the yarn introduction section 1 is larger than the opening area of the yarn take-out section 3, so that the discharged air flow flows in the direction opposite to the running direction of the yarn. The air that has completed the entanglement action is quickly discharged out of the nozzle through the outer peripheral surface side of the yarn introduction pipe 6 without affecting the introduced yarn, and the occurrence of turbulence in the air flow in the nozzle is reduced. As a result, a stable entanglement is imparted to the yarn, and furthermore, the vibrating vibration of the yarn in the vicinity of the yarn introduction section 1 is prevented, so that the noise is greatly reduced.

The yarn path diameter of the yarn introducing pipe 6 depends on the denier, bulkiness, etc. of the yarn to be interlaced, but may be set within a range that does not cause excessive frictional resistance on the running yarn 5, for example, 2000. For denier polypropylene BCF yarn for carpet, an inner diameter of 2 to 4 mm is appropriate, and when the inner diameter is 5 mm or more, the discharged air flow starts flowing through the pipe,
On the other hand, if the thickness is 1.5 mm or less, the resistance inside the running yarn and the yarn introducing pipe 6 increases, and the processing stability is deteriorated.

The length of the yarn introduction pipe 6 is not particularly limited as long as the discharged air flow can be separated from the traveling yarn. However, if the length is 20 mm or more outside the nozzle from the yarn introduction portion 1, the resistance due to the diffusion of the discharged flow is extremely small. It was confirmed experimentally.

Further, the center line of the high-pressure air injection port 4 and the yarn introduction pipe 6
(A) greatly affects the interlacing effect of the running yarn, and the distance must be wider than 1/4 of the nozzle diameter (b).

This suggests that the number of times the running yarn vibrates in front of the high-pressure air injection port 4 has a great effect on the interlacing in the interlacing. This distance is the nozzle diameter
If it is smaller than 1/4, the running yarn vibrates in front of the high-pressure air injection port 4, but the vibration becomes unstable, and it is difficult to obtain a uniform and strong interlaced yarn. Also,
Conversely, if it is too wide, the traveling yarn will be affected by the discharged air flow.

This relationship is the result of a study using false twisted yarn obtained from polyester, nylon, and acrylic multifilament yarns and BCF yarn of polypropylene and nylon.Strictly speaking, the physical properties of the supply yarn, total denier, required entanglement It is necessary to select an appropriate interval (a) according to the number and the like. Therefore, it is preferable that the yarn introducing pipe 6 be movable so that the interval (a) can be set arbitrarily when designing the nozzle.

The thickness of the pipe 6 may be appropriately selected within a range that does not significantly impede the flow of the exhaust air flow. The material is not particularly limited as long as it does not generate excessive frictional resistance or static electricity on the running yarn. Is not done.

The examples of the interlaced nozzles according to the present invention shown in FIGS. 2 to 5 each have a conventional nozzle with a yarn introduction pipe attached thereto. FIG.
An example is shown in which a nozzle disclosed in Japanese Patent No. 424 is provided with a cap with a yarn introduction pipe 6 having discharge air vents 7, 8. 3 to 5 show the case where the yarn introducing pipe 6 is provided in an interlace nozzle which is generally widely used.

It should be noted here that the yarn introduction pipe 6 does not need to be installed at the same center as the yarn take-out portion 3, and the yarn introduction pipe 6 is eccentric to the high-pressure air injection port 4 in the example of FIG. FIG. 5 shows an example in which the yarn introducing pipe 6 is installed obliquely to the yarn introducing section 1.

(Examples) Hereinafter, the present invention will be specifically described based on examples.

Example 1 Using two polypropylene filament yarns 700d / 60f,
An experiment was conducted by fabricating the nozzle shown in FIG. 1, and the results are shown in Table 1. The shape of the nozzle shown in FIG.
8mm diameter x 15mm for yarn introduction part 1 and 6mm diameter x 15m for nozzle part 2
m, the thread take-out section 3 is 3 mm diameter x 15 mm, and the high pressure air injection port 4
Was carried out at a yarn speed of 300 m / min using a 80 mm long yarn introducing pipe 6 to a nozzle having a diameter of 3 mm1.

Example 2 A polypropylene filament yarn 700 d / cm 2 was prepared using an interlace nozzle shown in FIG. 2 in which a cap with a yarn introduction pipe 6 having discharge air vents 7, 8 was prepared and attached to the nozzle of Japanese Patent Publication No. 61-57424. Table 2 shows the contents of the experiment using three 60f and the results.

(Effect of the Invention) According to the present invention configured as described above, a high-quality interlaced yarn can be obtained only by providing a yarn introduction pipe in a conventional nozzle, and the interlacing effect is dramatically improved. It is possible to significantly reduce the remarkable noise due to the severe vibration of the yarn on the yarn introduction part side, and to reduce the interlaced part and the spread part generated at the time of interlacing, which was only the case. It is possible to control the repetition pitch, to select the thread processing conditions according to the application, and to achieve the same level of quality as the conventional product, it is possible to operate at lower pressure than the conventional processing conditions, There are various effects such as a reduction in consumption and an improvement in productivity due to an increase in speed. Further, a great deal of effort has conventionally been required for nozzle development, but a secondary effect such as reduction in development cost can be expected if the present invention is effectively used.

[Brief description of the drawings]

1 to 5 are longitudinal sectional views of an interlaced nozzle showing different embodiments of the present invention. Description of main parts in the drawing 1... Yarn introduction section 2... Nozzle section 3... Yarn extraction section 4... High-pressure air injection port 6... Yarn introduction pipe a. Distance between the end of the yarn introduction pipe b ... Nozzle diameter

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-81154 (JP, A) JP-B-59-32568 (JP, B2) JP-B-51-13764 (JP, B2) JP-B-61- 57424 (JP, B2) JP-B-59-33694 (JP, B2) JP-B-48-30015 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) D02J 1/00

Claims (1)

(57) [Claims] 1. A yarn introduction section, a nozzle section, and a yarn take-out section having an inner diameter smaller than that of the yarn introduction section.
In the interlace nozzle in which the above high-pressure air injection port is opened and the discharged air flow is in the opposite direction to the running direction of the yarn, the yarn is extended from outside to the front of the high-pressure air injection port via the yarn introduction section. An interlace nozzle characterized by inserting an introduction pipe.