JPH01298229A - Open end spinning process and spinning frame - Google Patents

Abstract

PURPOSE:To smoothly deliver a yarn from a stationary trough while extending the twisting action up to the fiber positioned at the bottom of the stationary trough by forming an electric field on the wall of the stationaly trough and guiding the fiber into a twister in floated and/or vibrated state. CONSTITUTION:A plurality of electrodes 21 are parallelly embedded in the wall faces 5b, 5b of a stationary trough 5 and the lead wires 23a, 23b of the electrodes are connected to an AC power 22 to form electric fields on the wall faces 5b, 5b. Short fibers are delivered from a delivering port 1a of a duct 1 toward the opening 5c of the stationary trough. The short fibers under the collecting force with suction negative pressure of the suction duct 8 are floated and/or vibrated by the action of the electric fields and smoothly delivered to a twisting apparatus 9A.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an open-end spinning method and a spinning device for producing yarn at high speed, and in particular, it relates to an open-end spinning method and a spinning device for producing yarn at high speed, and more specifically, for smoothly twisting short fibers gathered on a fixed trough. The present invention relates to an open-end spinning method and a spinning device that can be supplied to the device side.

[Prior Art] Although various open-end spinning methods and spinning devices used therein have been considered, the present invention relates to a technology that uses a fixed trough to converge fibers. Prior art techniques using fixed troughs include Japanese Patent Application Laid-Open No. 58-4829 and US Pat. No. 4,492,075.

FIG. 4 is a schematic diagram for explaining an example of a spinning device using the fixed trough, and FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4.

The spinning device includes a supply duct 1 that opens and supplies short fibers.
, a fixed trough 5 that converges the short fibers, a twisting device 9 that twists the yarn, etc.; A combing roller 2 is provided. Further, the fixed trough 5 is formed in the shape of a gutter with a V-shaped cross section, and a suction duct 8 is disposed on the bottom rear side of the fixed trough 5, and the inside of the suction duct 8 and the V-shaped groove of the fixed trough 5 are formed into a plurality of grooves. The suction holes 6 communicate with each other. Further, a twisting device 9 is disposed on one of the bottom extension lines of the V-shaped groove, and a mechanical or fluid type twisting device is used as the twisting device. Furthermore, the fourth
In the figure, a mechanical type is illustrated in which a rotating body 30 having a spiral passage 31 is rotated at high speed to twist the fiber bundle.

Spinning by the above-mentioned spinning device is performed according to the following principle. The short fibers opened by the combing roller 2 pass through the supply duct 1 and are discharged from the discharge port 1a toward the V-shaped groove of the fixed trough 5. On the other hand, the inside of the suction duct 8 is connected to a vacuum pump (not shown), and the suction hole 6
A suction negative pressure is created. The diameter of the suction hole 6 is so small that short fibers cannot easily pass therethrough, and most of the short fibers are collected on the bottom 5a of the fixed trough 5. At the start of operation, the core yarn is passed between the fixed trough 5 and the twisting device 9, and the rotating body 30 is rotated at high speed.

As a result, the short fibers bundled at the bottom portion 5a are entangled with the core yarn and twisted. The twisted yarn Y is continuously pulled out by take-up rollers 11.11. The yarn Y that has passed through the twisting device 9 passes through the take-up roller 11, is guided by a winding roller 12, and is wound around a cheese 13.

[Problems to be Solved by the Invention] The fixed trough 5 has a configuration in which the short fibers are accumulated by the negative suction pressure of the suction duct 8, but if the negative suction pressure on the side of the suction duct 8 is too strong, the short fibers will accumulate. The fibers F are pressed against the fixed trough bottom 5a and come into close contact with the fixed trough bottom 5a.
The twisting action by the twisting device 9 cannot be applied to the back side of the fixed trough 5 (the side opposite to the direction in which the yarn is pulled out). Conversely, if the suction negative pressure on the suction duct 8 side is too weak, the
Some of the a-fibers overflow outside the fixed trough 5, which causes variations in the density of short fibers, which may reduce the strength of the spun yarn or This causes the inconvenience that it causes unevenness and makes it impossible to manufacture high quality yarn.

Therefore, the present inventors have developed a spinning method that can produce high-quality yarn by converging short fibers onto a fixed trough in a suitable distribution and by ensuring that the twisting of the twisting device is applied to the back of the fixed trough. As a result of various researches aimed at providing methods and spinning equipment,
The invention has been completed.

[Means for Solving the Problems] The oven-end spinning method of the present invention, which achieves the above object, forms an electric field on the wall surface of a fixed trough, and levitates and/or lifts fibers advancing into the electric field by dielectric action. The gist lies in the fact that it is guided to the twisting device while being vibrated. Further, the gist of the oven-end spinning device according to the present invention is that electrodes are provided on the wall surface of the fixed trough to form an electric field for floating and/or vibrating the fibers by dielectric action.

[Operations and Examples] FIG. 1 is a perspective explanatory view showing a typical example of the spinning device of the present invention. The fixed trough 5 is formed into a 7-shaped cross section by the wall surfaces 5b, 5b, and the supply duct 1 is disposed in the opening 5C of the fixed trough 5, with the discharge port 1a facing the bottom 5a. A suction duct 8 is provided below the fixed trough 5, and the inside of the suction duct 8 and the opening 5c side of the fixed trough 5 are communicated through a suction hole 6. A plurality of electrodes 21 are buried in parallel in the wall surface 5b, and on one side of the wall surface 5b, the electrodes 21 are connected to the lead wires 23a, 2
3b, each lead wire 23a, 23
b is connected to an AC power source 22. In this embodiment, a single-phase alternating current is used as the alternating current 22, but a polyphase alternating current can also be used by changing the connection form of the lead wires.

The spinning method performed using the fixed trough 5 is as follows. The short fibers F pass through the supply duct 1 and are discharged from the discharge port 1a toward the fixed trough opening 5C. Then, the short fibers are collected at the bottom 5a of the fixed trough 5 by the suction negative pressure of the suction duct 8 through the suction hole 6. On the other hand, electric Fi12
1 is applied with a voltage of 5 to 20 KV, an electric field is formed on the wall surface 5b of the fixed trough, and the short fibers entering the electric field are moved to the electrode 21 by electrophoretic action as shown in FIG. The orientation of the short fibers is aligned in the parallel direction between them (the longitudinal direction of the fixed trough 5), and kinetic energy is applied to the surface of the wall surface 5b by the polar change of the electrode 21 so as to cause it to vibrate. Therefore, even if the suction negative pressure in the suction duct 8 becomes a little too strong, the short fibers will not be pressed against the fixed trough bottom 5a, and the twisting action of the yarn twisted by the twisting device 9A will be limited to the fixed trough 5. from the fixed trough 5 to the fiber group located on the back side of the twisting device 9.
It will be pulled out smoothly to the A side.

In this embodiment, a pneumatic twisting device as shown in FIG. 3 (cross-sectional view) is used, but a mechanical twisting device or the like may also be used. The twisting device 9A has a passage hole 35.
The structure is such that the high-pressure air supplied from the nozzle 34 forms a vortex flow and twists the yarn Y.

Further, it is preferable that the electrodes 21 disposed on the opposing fixed trough wall surfaces 5b, 5b have the same polarity on opposite sides of the opening 5C at 180 degree point symmetry. , whereby the short fibers are fixed in the trough 5
It can be stably aligned in the longitudinal direction. Furthermore, if a traveling wave traveling in the yarn drawing direction is formed using an electric field using multiphase alternating current, the short fibers will behave as if they are floating from the surface of the trough wall surface 5b and move more smoothly in the yarn drawing direction 6 can be moved.

Next, the single-phase AC voltage applied to the electrode 21 is O17,1.
5 (KV) (English method number 20) was produced at the spinning speed shown in Table 1, and the properties of the yarns were compared. The negative suction pressure of the suction duct 8 is 850++++nAq, and a constant speed extension type tensile tester (Tensilon, manufactured by Toyo Baldwin) is used for strength measurement.
Te5ter (Model B: manufactured by Keizai Kogyo) was used.

For the evaluation of spinnability, a case where yarn breakage occurred slightly was indicated by a Δ mark, and a case where the yarn spun out was good was indicated by an ○ mark.

As is clear from Table 1, when produced with an electric field, the yarn quality can be 55 times better than when no electric field is produced. It has been found that when an electric field is formed, it can be applied to higher speed spinning, and problems such as yarn breakage are less likely to occur, making it possible to perform efficient spinning.

[Effects of the Invention] According to the present invention, even if the suction negative pressure at the bottom of the fixed trough is set slightly strong enough to uniformly bundle the short fibers, the fibers do not come into close contact with the bottom more than necessary, and the twisting device The twisting action reached the fibers located at the back of the fixed trough, and it became possible to pull them out smoothly from the fixed trough. As a result, high-quality yarn can now be produced stably at high speed.

[Brief explanation of the drawing]

Fig. 1 is a perspective explanatory view showing a typical embodiment of the device of the present invention, Fig. 2 is an explanatory view showing the principle of the invention, Fig. 3 is a sectional view showing an example of the twisting device, and Fig. 4 is An explanatory diagram showing an example of an oven-end spinning device, FIG. 5 is a sectional view taken along the line V-V in FIG. 4. 1... Supply duct 2... Combing roller 3
...Feet roller 4...Sliver 5...Fixed trough 6...Suction hole 8...Suction duct
9... Twisting device 11... Take-up roller 12... Winding roller 13... Cheese 21...
Electrode 22... AC power supply 23a, 23b...
Lead wire 33...High pressure air supply path

Claims (2)

[Claims] (1) In a spinning method in which fibers opened by a combing device are bundled in a fixed trough and twisted by a twisting device provided downstream of the fixed trough, an electric field is formed on the wall surface of the fixed trough, and the electric field An open-end spinning method characterized in that the fibers that have progressed inward are guided to a twisting device while being floated and/or vibrated by a dielectric effect. (2) A supply duct for feeding the opened fibers is provided facing the open surface of the gutter-shaped fixed trough, and a large number of suction holes are provided at the bottom of the fixed trough. The spinning device is provided with a twisting device on the downstream side, and the fixed trough wall is provided with electrodes that form an electric field to levitate and/or vibrate the fibers by dielectric action. Spinning equipment.