JPH03206130A - Nozzle for jet spinning device - Google Patents

Abstract

PURPOSE: To provide the subject nozzle having such a scheme that a nozzle insert helically grooved on at least part of its outer peripheral surface is connected to guide pipes, and air inflow holes are provided at appropriate positions of the guide pipes to afford a tangential perfect flow of compressed air so as to be invariant midway. CONSTITUTION: This nozzle for jet spinning device has such a scheme that guide pipes 5, 5' are fixed with O-rings inside a continuous hole 4 of a jet nozzle 1 and a heating nozzle 2 and a nozzle insert is pressed into the upper portion 7 of the guide pipes 5, 5'. The other end of the nozzle insert is provided with a helical groove 8, and the respective guide pipes 5, 5' are furnished with lateral holes 9 communicating with an air chamber 10 with a nozzle housing 3 at positions equal in height to the starting point of the groove 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a nozzle for a jet spinning device having a continuous conduit provided with at least one heating element in the longitudinal direction.

[Conventional technology and its issues]

Such nozzles are described, for example, in EP-A-0 321 8
It has been publicly known from Publication No. 85 and the like. This discloses a false twist nozzle with an insert that screens the exit of the tangential hole. This is to form an air layer before the surrounding fibers are picked up. Although this provides a considerable improvement in that the peripheral or cover fibers are wrapped more uniformly around the core fibers, the properties of the yarn formed are not satisfactory. One reason for this is that the tangential holes are not made accurately and open into the nozzle conduit in a stepped manner. To fabricate this hole, it is important to precisely set the drilling device in the direction of the hole. Otherwise, the hole may be too far away from the centerline of the conduit, creating a type of blind hole, or the hole may open too close to the centerline of the conduit. Correcting such deficiencies requires a large amount of expense.

[Means to solve the problem]

SUMMARY OF THE INVENTION An object of the present invention is to provide a jet spinning nozzle that is capable of forming a complete tangential flow of compressed air that does not change midway, is easy to manufacture, and is accurate.

This object is achieved by the features defined in the characterizing part of claim 1.

According to the present invention, a uniform rotating airflow can be created by simple means. A nozzle with a spiral groove is
It is easier and more accurate to manufacture than conventional nozzles with tangential holes.

The present invention will be explained in more detail based on preferred embodiments shown in the drawings.

〔Example〕

In each drawing, the same parts are given the same reference numerals.

FIG. 1 shows an injection nozzle 1 and a heating nozzle 2 fixed in a holder (not shown).

As is known, this injection nozzle 1 produces a left-handed twist, and the heating nozzle 2 produces a right-handed twist. The structure of the jet spinning device following the draft mechanism is well known and will not be described in detail here. The injection nozzle l and the heating nozzle 2 each have a nozzle housing with a continuous hole 4. A conduit section 5'' is fixed in this hole 4 by an O-ring.The conduit section 5' of the heating nozzle 2 widens conically at its end. It has a nozzle insert press-fitted into part 7.The other end of this nozzle insert is cut with a helical groove.

Each conduit section 5.5' has a transverse hole 9 connected to an air chamber IO with a nozzle housing 3 at the same height from the start of the helical groove 8. This air chamber 1
0 itself is connected via a connection 11 to a compression pump, not shown. The conduit section 5.5° is made of hardened steel. The diameter of this conduit section 5 is 2.5 mm.

On the other hand, the diameter of the conduit section 5 is 2.5 mm at the top and 2.5 mm at the bottom.
．． It ranges from 5 am to 3.5 mm. The length of the conduit section 5 is 3.6 cm, and the length of the conduit section 5'' is 4.6 cm.

As shown in FIG. 1a, the nozzle insert 7 has a constant conical slope, which slope is determined from the relationship between the angle (β) or the length III of the nozzle insert and the deviation l2 from the vertical. l2:l, or the tangent of angle β is approximately 1=
It is 50. The helical groove 8 has a cross-sectional area Q of 0.12 am'' calculated by the product of the width b and the depth L. The length L is the length of the nozzle insert 7 from the annular groove 12 to the lower end of the nozzle insert 7. It is determined from the length of the centerline of the groove 8 across the wall. This annular groove 12 serves to shape the compressed air flow without turbulence. The length it of the upper nozzle insert 7 of the injection nozzle 1 is 18.5 mm, so that the helical groove 8 has an inclination angle of 20' to 70°, preferably 50', on the outer wall. (α)
and has a length L of 3.2 ribs. The length l1 of the nozzle insert 7 of the heating nozzle is 10-, so the helical groove 8 has a length L of 3.2 circles on the outer wall, and its inclination angle is l5° to 70°, preferably 30°. 'is. Since the groove 8 is provided on the outer wall of the nozzle insert 7, it is possible to make grooves of any length without any problems.

In order to obtain a preferable rotating airflow layer, a relationship of 5:1 to 15:1, preferably about 10:1, should be satisfied between the length L and the square root of the cross-sectional area Q of the groove. It turns out.

FIG. 2 shows a second embodiment of the nozzle insert.

In this example, the helical groove B is provided in the tubular end of the stepped insert 13. This insert part 1
3 is press-fitted into the conduit portion 14. As can be seen from this figure, three spiral grooves 8 are evenly arranged over the entire circumference on the outer wall of the insertion bead l3. However, a larger number of spiral grooves may be provided, and the width of the groove may be reduced in accordance with the number of spiral grooves. As a result, it is possible to obtain a rotating airflow that always uniformly picks up the cover yarn, that is, the peripheral fibers and the core yarn. Threads may be provided on the inner surface of the conduit portion 14 and the outer surface of the tubular end portion of the insert portion 3 so that the two can be screwed together. but,! The shape of a presser is preferable.

FIG. 3 shows another simple embodiment of the heating nozzle 2, similar to FIG. Also in this case, the insert part 13 and the conduit part 1
It consists of 4. As can be seen, the conduit portion 14 comprises the conduit portion 5° of FIG. 1 and the nozzle casing 3.

The air chamber 10 is equipped with an insert 13 so that an even and good airflow is ensured. Furthermore, an annular groove 12 is provided on the outer wall of this nozzle insert.

The length of this nozzle insert 7 is ICI, the annular groove has a length of 2.5 mgm, and the helical groove 8 has a length of 3.2 m.
It is arranged on the outer wall over a length L. The insert part 13 and the conduit part 14 are connected through a part of the taper! They are fixed to each other by press fitting.

In this example, the spiral groove 8 has a constant cross-sectional area Q over its entire length L. However, it may also be in the form of a partially tapered Venturi nozzle as shown in FIG. 3a. This type of shape can be machined with great precision by a milling/poling machine that can be raised and lowered into position.

Yarns produced by jet spinning equipment equipped with these novel nozzles were found to have even peripheral fiber wrapping. Furthermore, these nozzles can be easily manufactured because only the nozzle insert 7 needs to be precisely manufactured. The insert section 13 as well as other parts such as the conduit section I4 need only be made to a normal degree of precision and can therefore be machined on conventional lathes or milling machines.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the structure of a nozzle according to a first embodiment of the present invention, FIG. 1a is a side sectional view of a nozzle insert, and FIG. 2 is a perspective view of a nozzle according to a second embodiment of the present invention. FIG. 3 is a side sectional view of a nozzle according to a third embodiment of the present invention, and FIG. 3a is a side sectional view of a nozzle insert with a venturi-type helical groove. ■... Injection nozzle, 2... Heating nozzle, 3... Nozzle housing, 4... Continuous hole, 5,5''... Conduit section, 6... O-ring, 7... Nozzle Insert, 8...Spiral groove, 9...Horizontal hole, 10...Air chamber, l1...Connection part, 12...Annular groove, 13...Nozzle insert, l4...Conduit Fig. 3a Procedural amendment (method) February 21, 2012

Claims (1)

Claims: 1. A longitudinally extending continuous conduit section (5, 5') provided with at least one heating element;
, 5'), at least a part of which has a vertical cylindrical shape and is connected to the nozzle insert (7, 13), and is provided with a spiral groove (8) in at least a part of its outer peripheral surface,
A nozzle for a jet spinning device, characterized in that air inflow holes (9) are formed at appropriate locations in the conduit section. 2. The cross-sectional area of the spiral groove (8) relative to the length (L) (
2. Nozzle according to claim 1, characterized in that the ratio of the square root of Q) is in the range 5:1/15:1, preferably 10:1. 3. Nozzle according to claim 1 or 2, characterized in that the helical groove (8) has an angle of inclination (α) ranging from 15° to 70°, preferably from 30° to 50°. 4. Said helical groove (8) widens towards its end and/or takes the shape of a bench lily tube, and said groove (8) at the starting point
8) The ratio of the width to the width at the end point is 1:1.5 to 1:
4. A nozzle according to any one of claims 1, 2 and 3, characterized in that the ratio is approximately 1:3. 5. Nozzle according to any one of the preceding claims, characterized in that the nozzle insert (7, 13) is at least partially press-fitted into the conduit section (5, 5'). 6. A terminal end of the nozzle insert (7, 13) and a starting end of the conduit part (5, 5') are provided with threads corresponding to each other, and the nozzle insert (7, 13) is connected to the conduit part (5, 5'). 6. The nozzle according to claim 1, wherein the nozzle is screwed onto the nozzle 5'). 7. characterized in that at least three helical grooves (8) are provided and the outlet openings at the ends of the nozzle insert (7, 13) are provided evenly distributed on the outer circumferential surface of the nozzle insert; The nozzle according to any one of claims 1 to 6.