JPS6223809Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on a balloon control tube used for air spinning in which a drafted short fiber bundle is false-twisted in opposite directions using two false-twisting nozzles to form yarn. It is related to.

FIG. 1 is a simplified process side view of an air spinning apparatus in which a drafted short fiber bundle is false-twisted in opposite directions using first and second false-twisting nozzles to form a yarn. That is, the short fiber bundle S drafted by the draft section 4 consisting of the back rollers 1, 1', the aprons 2, 2', and the front rollers 3, 3' is passed from the air injection port 6 of the first false twisting nozzle 5 to the direction indicated by the arrow. The short fibers generated at this time are drawn into the first false-twisting nozzle 5 by the suction force generated by the jetted airflow in seven directions, and then are false-twisted and bundled by the jetted airflow. The balloon 8 of the bundle S sends the short fiber bundle S to the subsequent second false twisting nozzle 10 while being controlled by a balloon control tube 9. In the second false twisting nozzle 10, the air injection port 1
1 to the arrow 12 direction, the yarn Y is false-twisted in the direction opposite to that of the first false-twisting nozzle 5, and the yarn Y is formed by the drawing rollers 13, 1.
3' and wound around a cheese 15 driven by a drum 14. The function of the first false twisting nozzle 5 in this case is to prevent the false twist imparted to the short fiber bundle S by the second false twisting nozzle 10 from propagating to the front rollers 3, 3'; Thereby, the short fiber bundle S existing between the first false twisting nozzle 5 and the front rollers 3, 3' is brought into a non-twisted state. That is, the front roller 3,
By making the short fiber bundle S sent out from 3' into a non-twisted state, the short fiber bundle S passes through the first false twisting nozzle 5 in a substantially non-twisted parallel state,
As a result, the first false twisting nozzle 5 and the second false twisting nozzle 10
The tips of the fibers of the short fiber bundle S in the parallel state are attached to the fiber bundle main body of the short fiber bundle S that is falsely twisted between the fiber bundles S, and the fiber bundle main body passes through the second false twisting nozzle 10. When the hanging false twist is untwisted,
The tips of the fibers are wound around the outer layer portion of the fiber bundle main body in the untwisting direction, that is, in the opposite direction to the false twisting direction, to form a real twisted yarn Y.

However, in this case, if the balloon 8 in the first false-twisting nozzle 5 is not controlled so as to maintain stable rotation and trajectory, that is, the shape, the second false-twisting nozzle 10 as described above Therefore, the effect of the first false twisting nozzle, which prevents the false twist imparted to the short fiber bundle S from propagating to the front rollers 3, 3', cannot be stably exerted. As such, the parallel fiber tips attached to the fiber bundle main body between the first false twisting nozzle 5 and the second false twisting nozzle 10 disappear, and the outer layer of the fiber bundle main body after passing through the second false twisting nozzle 10 disappears. As a result, there are no fibers that are actually twisted and wound around the part, and the spun yarn Y is almost untwisted and its yarn strength is extremely low.

As is clear from the above, in the air spinning method in which the short fiber bundle is false-twisted in opposite directions using two false-twisting nozzles to spin yarn, the false-twisting occurs in the first false-twisting nozzle 5. Control of the balloon 8 of the short fiber bundle S is extremely important. Therefore, various attempts have been made in this regard, such as the
There is an untwisted tube described in Publication No.-32808. The untwisting tube has an uneven inner wall on the exit side of the first false-twisting nozzle, or an inner wall having a rectangular cross section perpendicular to the tube axis, and the second
The one shown in the figure a is that of the uneven inner wall, and the one shown b is that of the rectangular inner wall, both of which are cross sections perpendicular to the traveling direction of the short fiber bundle S, that is, the passage path thereof. This shows that. The former type with an uneven inner wall can shorten the length of the balloon 8 generated by the first false twisting nozzle 5, but since the short fiber bundle S can freely move between the concave and convex parts of the inner wall, The length and trajectory of the balloon 8 change each time, making it impossible to achieve stable false twist convergence. Also, in the case of the latter having a rectangular inner wall, when the short fiber bundle S passes through the inner wall, the short fiber bundle S is twisted in the direction of the short side of the rectangle. Although the movement of the short fiber bundle S is restricted to be short, it can move relatively freely in the direction of the long side, so the length and trajectory of the balloon 8 change, making it impossible to achieve stable false twisting and converging the balloon. 8 is not sufficiently controlled, a strong yarn Y cannot be spun.

The present invention aims to solve the above-mentioned drawbacks and provide a balloon control tube that can sufficiently control the balloon generated in the first false twisting nozzle and make it possible to spin a strong yarn Y. .

That is, the present invention has a short fiber bundle passage that is perforated through the axis of the column, and a short fiber bundle passage that extends over the entire length of the fiber bundle passage from the fiber bundle passage in a direction opposite to the rotational direction of the short fiber bundle balloon. This is a balloon control tube for an air spinning device, which has a plurality of cut grooves provided so as to bulge and curve.

The structure of the present invention will be described in detail below. Fig. 3 shows a vertical cross section of the short fiber bundle passage of the balloon control tube of the air spinning device according to the present invention. The short fiber bundle passage 9', which is a passage for the short fiber bundle S, is located at the axis of the balloon control tube 9', which is a cylindrical or prismatic body.
L is drilled through and the balloon control tube 9'
In the cylindrical body of the short fiber bundle passage 9'L, a plurality of cut grooves 9'N are drilled along the entire length of the short fiber bundle passage 9'L from the fiber bundle passage 9'L toward a radial direction perpendicular to the passage 9'L, so as to curve while expanding in the opposite direction to the direction of the arrow 9'M, which is the rotation direction of the balloon 8 of the short fiber bundle S. Since the balloon control pipe 9' according to the present invention has the above-mentioned configuration, all of the cut grooves 9'N are
The short fiber bundle passage 9'L is in the center, so to speak, in a spiral shape along the rotation direction of the balloon 8 shown by the arrow 9'M.
Therefore, the short fiber bundle S passing through the balloon control pipe 9' can always be located in the short fiber bundle passage 9'L which is the center. Therefore, the balloon 8 generated in the first false twist nozzle 5 is controlled,
This can be maintained in a very stable state.
Furthermore, the exhaust of the jet of air injected into the first false twist nozzle 5 for suction and false twisting is performed without hindrance from several points, namely the cut groove 9'N and the short fiber bundle passage 9'L, so that the jet vortex flow is stable and, therefore, the state of the false twist applied by the first false twist nozzle 5 is also stable. Therefore, the balloon control tube 9' according to the present invention can sufficiently prevent the propagation of the false twist from the second false twist nozzle 10 by stabilizing the rotation, length and trajectory of the balloon 8, and can stably keep the short fiber bundle in an untwisted state between the first false twist nozzle 5 and the front rollers 3, 3'. As a result, the parallel fiber tips can be sufficiently attached to the short fiber bundle S false twisted between the first false twist nozzle 5 and the second false twist nozzle 10, so that the untwisting action of the fiber bundle main body after the fiber bundle main body has passed the second false twist nozzle 10 allows the fiber tips attached thereto to be sufficiently wound around the fiber bundle main body in a true twist, thereby obtaining a uniform yarn Y with high yarn strength.

[Brief explanation of the drawing]

Figure 1 is a simplified process side view of the air spinning device, Figure 2
The figure is a vertical cross-sectional view of a short fiber bundle passage of a conventional balloon control tube, and FIG. 3 is a vertical cross-sectional view of a short fiber bundle passage of a balloon control tube according to the present invention. S... Short fiber bundle, Y... Yarn, 5... First false twist nozzle, 9,9'... Balloon control tube, 10...
Second false twist nozzle.

Claims (1)

[Scope of utility model registration request] A short fiber bundle passage is perforated through the axis of the column, and over the entire length of the short fiber bundle passage, the short fiber bundle passage bulges out from the short fiber bundle passage in a direction opposite to the direction of rotation of the short fiber bundle balloon and curves. A balloon control tube for an air spinning device having a plurality of cut grooves provided as shown in FIG.