JPS59116442A - Nozzle for fluid processing of 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] The present invention relates to a running multifilament yarn.

Apply a jet of high-pressure fluid such as compressed air or water vapor.

The present invention relates to a nozzle for fluid processing of yarn used to produce bulk yarn by entangling the single fibers constituting the yarn and imparting morphological deformations such as loops and slack.

More specifically, an annular space is formed by a convex conical surface provided on the outside of the tip of the thread entrance member (hereinafter referred to as the needle) and a concave conical surface provided on the inside of the rear end of the thread exit member (hereinafter referred to as the venturi). A fluid disturbance chamber is formed between the tip of the annular space and the yarn outlet, and the yarn is run along the axes of the two conical surfaces, while the four positive fluids are passed through the annular space. The present invention relates to an improvement in a fluid processing nozzle for yarn, which is introduced as a jet into a fluid agitation chamber and is used to process a running yarn to form a high curl.

As mentioned above, a fluid processing nozzle for producing a direct umbrella by applying a jet of high-pressure fluid to a running yarn was developed in the Japanese Patent Publication No. 38.
-2828 Publication, U.S. Patent Specification No. 3545c157
It is known by its number etc. However, these nozzles for fluid processing of yarn are insufficient to fix the deformed states of the single fibers, such as entanglements and loop slacks formed in multiple single fibers forming a multifilament. Even when treated with relatively low tension, the tangles, loops, sag, etc. created by yarn processing disappear, and knitted fabrics using these yarns cannot exhibit the expected bulk straightness. There were drawbacks.

Many devices have been proposed to improve this drawback. For example, the conical surface part provided at the tip of the needle and the conical surface part formed at the rear end of the venturi are arranged eccentrically, or the extension line of the center line of the injection hole is arranged so as to intersect with the outer circumference of the needle. A method has been proposed in which high-speed fluid collides with the outer circumferential portion of a needle and then is directed to a venturi circular sensor (Japanese Patent Laid-Open No. 139854/1983). However, in the former, the conical surface part provided at the tip DjM of the needle and the circular part provided on the venturi.

With a nozzle that has a structure where the surface part is eccentric, a deviation in the level adjustment to the degree of eccentricity will have a large effect on the quality of the yarn.

It is difficult to adjust the needle and venturi to the optimum position and assemble them, and the adjustment requires a long time. In addition, the latter is provided at the tip of the needle so that the extension line of the center line of the injection hole intersects with the outer circumference of the needle so that the high-speed fluid collides with the outer circumference of the needle and then directs it to the conical surface of the venturi. In order to maintain the conical surface portion and the conical surface portion of the rear end of the Venturi in a position where optimal disturbance occurs, the intersection point between the extension of the center line of the injection hole and the outer circumferential surface of the needle should be moved slightly in the axial direction of the needle. By simply moving the nozzle back and forth, the disturbance effect changes slightly, and the quality of the yarn produced from multiple nozzles is adjusted to a constant level. The disadvantage was that it was difficult to

An object of the present invention is to improve the above-mentioned deficiencies of the prior art, and to provide a nozzle for fluid processing of yarn, which is particularly capable of firmly holding morphological deformations such as entanglements and loops formed in the yarn. This is what I am trying to do.

In order to achieve the above object, the present invention has the following configuration.

That is, a convex conical surface provided at the tip of the thread entrance member,
a concave conical surface provided at the rear end of the yarn exit member and an annular space formed between both conical surfaces with a small gap therebetween; at least one high-pressure fluid opening at the bottom of the space; an introduction hole, a yarn entrance opened at the tip of the yarn entrance member;
In a fluid processing nozzle for yarn, which includes a yarn outlet opened at the rear end of the yarn outlet member and a fluid stirring chamber formed between the yarn inlet and the yarn outlet, the high-pressure fluid introduction hole is an extension of the center line of the nozzle. is arranged such that it penetrates the entire length of the annular space and intersects with the axis of the conical surface, and the conical angle θ1 formed by the concave conical surface provided at the rear end of the yarn exit section is This fluid processing nozzle is characterized by a cone angle θ formed by a convex conical surface provided at the tip of the nozzle.

Further, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of a nozzle for fluid processing of yarn according to the present invention.

In FIG. 1, the needle 2 has a thread introduction guide 9 with an opening 16 in the housing 1 and a long slender hole 11 into which a guide 12 forming a thread entrance is inserted at the other end.
It is inserted in a screwed manner and fixed in an optimal position with a lock nut 10. A convex conical surface 4 provided on the outside of the tip of the needle 2 faces a concave conical surface 5 provided on the inside of the rear end of the venturi 6, forming an annular space 21 therebetween. The venturi filter is fixed to the housing 1 with a screw 16 as shown, and an O-ring 19 is provided to prevent high pressure fluid from leaking from the mating surface of the housing and the venturi.

As shown in the figure, a fluid stirring chamber 6 is formed by the tip of the needle 2 and a part of the concave conical surface at the rear end of the venturi 3. This fluid stirring chamber 6 is connected to the yarn outlet 8 of the venturi via a venturi throat 17, and the yarn exiting from the yarn inlet 12 at the tip of the needle is connected to the liquid stirring chamber 6. It sequentially passes through the venturi throat 17 and the venturi yarn outlet 8.

guided upwards. On the other hand, high-pressure fluid such as compressed air or water vapor is guided to the fluid inlet 15 from another supply source (not shown). The fluid introduction port 15 passes through the injection hole 7 whose tip is constricted,
It opens at the bottom of the annular space 21.

An extension of the center line 20 of the fluid inlet 15 is configured to pass through almost the entire length of the annular space 21. That is, the extension line of the center line 20 is the conical surface 4 or 5 and the annular space 21.
Care should be taken to avoid configurations that would cause excessive collisions within the system. With the above configuration, the multifilament yarn entering the fluid agitation chamber B from the guide 12, which forms the tip yarn inlet of the needle 2, is opened into individual single fibers by the agitation action of the fluid, and is subjected to very short circumferential vibrations. It is ejected from the yarn outlet 8 along with the fluid. A yarn guide 14 is supported by a bracket 22 and attached near the tip of the yarn outlet 8. This yarn guide 14 has the function of promoting the fixation of morphological deformations such as loops and slack formed in individual single fibers of the yarn ejected from the yarn outlet 8 together with the high-speed fluid. . The nozzle shown in Figure 2 is the first
The difference from that shown in the figure is that the needle 2' is fixed to the housing 1 with a screw 25, the optimum distance between the venturi 6 and the needle 2' is adjusted with gaskets 23 and 24, and the tip of the injection hole 7 is set with a countersunk. This is the point where the surface is tapered.

FIG. 6 is a partially enlarged view of the nozzle in a different form from that in FIG. 40 cone angle θ, showing a larger closed shape, and an injection hole piece 26 provided with a fluid injection hole 7 is inserted. This makes it easy to change the injection hole diameter.

FIG. 4 shows the conical surface provided on the inner surface of the rear end of the venturi used in the present invention, which is changed in two stages, and θ, 1>θ2. This shows the shape.

In FIG. 5, the conical surface shape of the inner surface of the venturi is changed to create a trumpet shape with the song title "['-diameter R7'/". As can be seen from FIGS. 4 and 5, the shape of the conical surface may be changed in three steps instead of two, or the angle may be changed continuously in this manner.

FIG. 6 shows the shape of the conical surface provided at the tip of the needle used in the present invention changed in two stages, ' and θ, 1>θ.

This shows the mode in which the

FIG. 7 is a schematic diagram showing an example of a bulk height processing apparatus using the yarn d-fluid processing nozzle according to the present invention. In this device, the yarn 28 unwound from the package 27 passes through a guide 29 and is supplied by a supply row 260 to a nozzle 61 for fluid processing of the yarn. Here, the individual single fibers forming the yarn 28 are entangled with the high-pressure fluid, are given a morphological deformation such as a loop, and are taken off by a take-off roller 32.

Further, it is wound up by a winding device 63.

FIG. 8 is an enlarged cross-sectional view of a part of the yarn fluid processing nozzle used in the experiment of Example B. Here, an extension of the central axis 20 of the injection hole 7 is directed toward a conical portion provided on the inner surface of the rear end of the venturi 6 at a position shielded by the outer circumference of the needle 2.

In the nozzle for fluid processing of yarn having the above-described structure, the conical angle θ2 of the conical surface 4 provided at the tip of the needle 2 is preferably 90° or less, preferably 60°.

In addition, the conical angle θ, I of the first stage in which the conical surface provided at the tip of the needle 2 is changed in two stages is preferably 90 degrees or less, preferably about 60 degrees, and the conical angle θ2 of the second stage is 90 degrees or less, preferably about 60 degrees. is preferably 45 degrees or less, preferably about 30 degrees.

The cone angle θ of the conical surface 5 at the rear end of the venturi 6 is preferably 90 degrees or less, preferably about 70 degrees.

Also, when this cone angle is changed in two stages, the first stage cone angle θ1. is less than 90 degrees, preferably about Z.

The cone angle θ of the second stage is preferably 12 [] degrees or less, preferably about 90 degrees.

Further, the opening angle of the yarn outlet 8 opened at the tip of the venturi 6 is preferably 8°. Thread introduction guide for needle 29. The material of the guide 12 and the venturi 6, which form the thread entrance, is preferably ceramic or cemented carbide with high wear resistance.

Since the nozzle for fluid processing of yarn according to the present invention has the above-described configuration, it has the following features.

As shown in FIG. 1, a convex conical surface 4 provided at the tip of the needle 2 is an extension of the center line 20 of at least one injection hole 7, and a concave conical surface 5 provided at the rear end of the venturi 60.
By penetrating almost the entire length of the annular space 21 formed between the needles 2 and on the other hand, by injecting from one side of the needle 2 to create a drifting effect, it is possible to further increase the opening effect in the fluid disturbance chamber B. can. In addition, as shown in FIG. 3, the cone angle θ1 of the concave conical surface 50 provided at the rear end of the venturi 6 is made more dog-shaped than the cone angle θ1 of the convex conical surface 4 provided at the tip of the needle 2. Since the annular space 21 formed by the conical surfaces 4 and 5 has a larger constriction as it approaches the tip of the needle 2, the speed of the fluid supplied from the injection hole piece 26 increases as it approaches the tip of the needle. This is thought to further promote the drifting effect.

Furthermore, the concave conical surface provided at the rear end of the venturi 6 as shown in FIG. 4 is changed into two stages.

Alternatively, the convex conical surface provided at the tip of the needle 2 as shown in FIG. 6 can be changed into two stages.

The flow of fluid in the annular space 21 is increased in speed by the throttle toward the tip, and is then expanded all at once in the fluid disturbance chamber 6, thereby increasing the disturbance effect.
The yarn fed into the fluid agitation chamber from the guide 12, which forms the yarn inlet of the needle 2, is subjected to the agitation action of the fluid there and is sufficiently opened into individual single fibers, producing very short period vibrations, after which the high-pressure fluid At the same time, it is ejected from the yarn outlet 8 through the venturi throat 7'. At that time, the single fibers that make up the yarn are given a high degree of entanglement, loops, slack, etc.

Furthermore, it is thought that these fibers form a complex yarn shape in which they are intertwined with each other and maintain high bulk straightness.

The form and various characteristics of the yarn produced using the nozzle for fluid processing of yarn according to the present invention are determined by the amount and speed of the fluid passing through the nozzle, the speed at which the yarn passes, the overfeed rate, the type of fiber, and the It depends on the number of fibers and other custom yarns, but
The dimensions of each part of the nozzle are also an important factor. Among them, the diameter of the guide 12 that forms the thread entrance of the needle 2, the cone angle of the convex conical surface 4 provided at the tip of the needle 2, the cone angle of the four-shaped conical surface 5 provided at the rear end of the venturi 6, and the throat. 17, the diameter of the injection hole 7, and its inclination angle are important factors.

The present invention will be explained in detail below using comparative examples.

Example 1 Using the nozzle for fluid processing of yarn shown in FIGS. 1 and 6, an experiment was conducted in which the cone angles θ1 and θ of the conical surfaces provided on the venturi and needle were changed. In fact, the nozzle used for the monument has a diameter of 5 rr at the thread entrance.
rm, the diameter of the venturi throat connected to the yarn outlet is 1.8 mm, and the diameter of the injection hole is 2.4 mm.

The length of the fluid disturbance chamber was kept constant at 1.5'mn+ (distance between the venturi throat and the thread entrance).

The yarn processing conditions were kept constant as shown in Table 1.

Table 1 Raw yarn used Polyester 150D-72F Surface speed of supply roller 300 m/min Surface speed of take-up roller 207 m/min Surface speed of take-up roller 238 m/min Supplied to injection hole Compressed air pressure: 5 kg/cm''G Note that the injection angle of the injection hole was adjusted according to the cone angle of each nozzle, so that the extension of its center line penetrated the annular space over its entire length.

The quality of the resulting umbrella was evaluated by measuring the tension immediately before the winding device as shown in FIG. The fact that this tension is high indicates that the obtained umbrella has a strong ability to retain direct entanglement, loop slack, etc.

As is clear from the results in Table 2, it is clear that as θ and -θ become larger, the tension T increases.

If the rate of increase is θ1-θ, >5, it will be more noticeable. Also, θ seems to have an optimum value around 60. It has been found that good results can be obtained by rapidly constricting and accelerating the high-pressure fluid and guiding it into the fluid disturbance chamber in this way.

Regarding the upper limit value of θ1-〇, 1 in this example.Example 2 In the apparatus used in Example 1, the cone angle of the convex conical surface provided at the tip of the needle was constant at 600.

Table 6 shows the results of an experiment in which the concave conical surface provided at the rear end of the venturi was made into two stages as shown in FIG.

Table 6 In all of the results in Table 6, the value of tension T is larger than when θ is set to one step.

Example 6 Using the apparatus shown in FIG. 8, the optimum position of the fluid injection hole 7 was determined through experiments. In this experiment, the needle 2 and the venturi filter were set at the optimum interval, that is, the length of the fluid disturbance chamber was set at the optimum length, and the nozzle center axis (
Both the needle and the venturi were moved as one in the direction of the axes of the conical surfaces 4 and 5. Here, at the point X=O, the extension line of the center line 20 of the injection hole 7 is the tip tapered surface 4 of the needle 2.
This is a position that penetrates the entire length of the annular space 21 formed by the conical surface 5 of the venturi 6. Note that from X=0, the direction was determined by setting the exit direction of the yarn as a plus and the inlet direction as a minus.

The dimensions of each part of the nozzle used in this comparative example are as follows.

Tip exit guide diameter of needle 2 0.5 rrm Conical surface 4 provided at the tip of needle 2 with a cone angle of 60 degrees Venturi, diameter 1.8 mm of throat portion 17 of needle 6 Concave cone provided at the rear end of the venturi The machining conditions were the same as in Example 1: the conical angle of the surface 5 was 70 degrees, the diameter of the injection hole 7 was 2.4 mm, and the inclination angle of the injection hole was 62.5 degrees with respect to the center of the nozzle. The experiment was conducted three times, and the evaluation was based on the winding tension.

The obtained results are shown as a graph in FIG. As shown in FIG. 9, the winding tension at the position of X=O all shows a tendency to be high. That is, it is considered that the optimum position is for the center line 2o of the injection hole 7 to pass through almost the entire length of the annular space 21 formed by the needle 2 and the venturi 6. It has become clear that changing the knitting angle changes the characteristics of the yarn, and that when fluid collides with the outer periphery of the needle 2, the quality of the yarn varies depending on the position of the collision.

[Brief explanation of drawings]

1 and 2 are sectional views showing an example of the apparatus according to the present invention, and FIG. 3 is a partially enlarged view of FIG. 1. 4 and 5 are sectional views showing the inner surface shape of the venturi, and FIG. 6 is a front view showing the shape of the tip of the needle. FIG. 7 is a schematic diagram showing an example of a bulk height machining device using the fluid machining nozzle of the present invention, and FIG. 8 is a nozzle used in Example B: 5: Convex conical surface 6: Fluid disturbance chamber 7 : Spray hole 8: Yarn exit 12 guide 15: Fluid introduction hole 17: Throat of pentillary 20: Center line of jet hole 1: Nozzle for fluid processing of yarn Patent applicant Toshi Co., Ltd. 238- No. Figure 2

Claims (1)

[Claims] (1) A convex conical surface provided at the tip of the thread entrance member. A concave conical surface provided at the rear end of the yarn exit member and an annular space formed between the two conical surfaces by concentrically facing each other with a small gap, at least one opening at the bottom of the space. A yarn comprising a high-pressure fluid introduction hole, a yarn inlet opened at the tip of the yarn inlet member, a yarn outlet opened at the rear end of the yarn outlet member, and a fluid stirring chamber formed between the yarn inlet and the yarn outlet. In the fluid addition nozzle, the high-pressure fluid introduction hole is arranged so that its center line extends through the annular space over its entire length and intersects with the axis of the conical surface, and the high-pressure fluid introduction hole Fluid processing of yarn, characterized in that the conical angle θ formed by the concave conical surface provided at the tip of the yarn entrance member is smaller than the conical angle θ formed by the convex conical surface provided at the tip of the yarn entrance member. Nozzle for. (2. Claims (In the nozzle for fluid processing of yarn according to 11, the concave conical surface formed at the rear end of the yarn exit member is formed in two stages, and the concave conical surface formed on the yarn exit side A nozzle for adding fluid to a thread, characterized in that the conical angle θ, 1 of the thread is smaller than the conical angle θ1 of a conical surface formed at the rear end. (3) Scope of claims [l] In the fluid processing nozzle for yarn described above, the convex conical surface formed at the tip of the yarn entrance member is formed in two stages, and the conical angle θ, i of the conical surface formed on the yarn entrance opening side is A nozzle for fluid processing of yarn, characterized in that the cone angle θ2 of the conical surface formed thereafter is set to a dog.