JPH0224926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a short fiber removal device that uses static electricity to remove short fibers from a group of fibers.
In addition, in the present invention, short fibers refer to short fibers in the fiber group.
In the cotton fiber fiber length measurement method specified in JISL1019, it refers to fibers with a fiber length calculated as short fiber content.

Conventional technology In the spinning process, in order to produce high-quality yarn, it is important to remove short fibers, which are usually present in a few percent or more in the raw fiber group, and to make fiber bundles as parallel as possible. It is. On the other hand, the most common means for removing short fibers currently in use is mechanical means such as pulling or combing from fibers or fiber bundles held at one end, such as with a comb. In addition to the mechanical means mentioned above, a method using static electricity was proposed [Textile World, 1966
June issue, ("Textile Technology News" No. 354, 1968)
Published by the Japan Textile Industry Association in September 2013). In other words, it is a method that uses an asymmetric electrostatic field, and as shown in Figure 3, there are two electrodes, one of which
Piece 1 has a planar shape, and the other one 2 has a curved surface that forms a part of an ellipse.These two electrode surfaces are arranged as shown in Fig. 3 above, and the potential is the same as that of the electrode. It changes non-linearly in inverse proportion to the distance between. In actual operation, individual fibers are fed between the electrodes A at the point of lowest electrostatic field strength. Then, these fibers are arranged along the direction of the force between the electrodes, and the fibers are further attracted toward the point B where the electric field strength is strong. In this case, long fiber Fl is short fiber
Move to point B more quickly than Fs. The short fibers Fs are not attracted as easily as the long fibers Fl to the above-mentioned location B where the electric field strength is strong, and remain in the location A where the electric field strength is weak for a long period of time. This principle allows fibers to be separated according to their length, and short fibers Fs can be removed between the electrodes. Figure 4 shows an example of a specific device, which is equipped with a flat electrode 1 and a curved electrode 2 of the same type as shown in the principle of Figure 3. In order to carry out the continuous production required, an endless belt 3 traverses between the two electrodes 1, 2 and successively carries away the fibers from the supply side. This endless belt 3 moves the arranged fibers in a direction perpendicular to the direction of fiber transfer and movement. The long and short fibers are then conveyed to two suction ducts: a short fiber take-out duct 4 that takes out the separated short fibers Fs, and a long fiber take-out duct 5 that takes out the long fibers Fl.

Problems to be Solved by the Invention Among the above-mentioned conventional means for removing short fibers from a group of fibers, in the case of mechanical means, fibers are likely to be cut, and at the same time the short fibers are removed, conversely. This results in the formation of short fibers and neps, making it extremely difficult to reduce the short fibers below a certain limit, and further causing problems such as an increase in the amount of short fibers to be removed. In addition, in the case of electrostatic means, the short fibers remain in a place where the electric field strength is weak for a long period of time, and the short fibers floating between the electrodes gather together and form connected long fibers to the long fiber side. There are problems such as migration, and the efficiency of short fiber separation is not good.

In the present invention, in removing short fibers from a fiber group,
It is an object of the present invention to provide a short fiber removal device that solves the problems of the conventional techniques described above by focusing on electrostatic means.

Means for Solving the Problems In order to solve the above problems, the short fiber removing device of the present invention has two rotatable short fiber removing devices facing each other with a predetermined interval.
a cylindrical net, a static electricity generator that applies high-voltage static electricity between the two cylindrical nets, and a suction device disposed on the back side of the opposing surface of the two cylindrical nets. and a fiber group supply device provided on the upper side of the rotation of the opposing parts of the two cylindrical nets, and a fiber group supply device provided on the rotationally lower side of one of the nets from near the center of the opposing parts of the two cylindrical nets. It is characterized by comprising a conveyor belt for sending out fiber groups, which is provided in contact with the circumferential surface of the net, is oriented at right angles to the center of rotation of one of the nets, and runs in the same direction as the other net.

Function The short fiber removing device is configured to be able to apply high voltage static electricity between two rotatable cylindrical meshes that are attracted from the back side and face each other at a predetermined distance. If a group of fibers is supplied between two opposing cylindrical meshes, the fibers will be held almost perpendicular to the mesh surface between the meshes, and the fibers with long fiber length will be continuous with each other and will be held almost vertically between the meshes. The short fibers form a bridging shape between the nets, are held as they are, and move as the net rotates, and are sent out in the longitudinal direction of the fibers by the fiber group feeding device. The fibers go back and forth between the screens and are eventually sucked into the suction device on the back side by the suction airflow and removed, allowing for efficient removal of short fibers without causing any damage to the fibers, and in addition, the fibers are well-aligned. You can also get bundles.

Example An embodiment of the present invention will be described based on the drawings.

1 and 2 show a short fiber removing device according to an embodiment of the present invention, with FIG. 1 being a schematic perspective view and FIG. 2 being a schematic side sectional view. In FIGS. 1 and 2, two cylindrical nets 13 and 14 are arranged horizontally and in parallel inside a device frame 12 of a short fiber removing device 11, with their peripheral surfaces spaced apart from each other by a predetermined interval. They are placed facing each other. It is preferable that the predetermined interval is such that the interval 1 between the circumferential surfaces 13a and 14a on the straight line L connecting the rotation centers of the cylindrical nets 13 and 14 is usually 1.5 to 2.5 times the effective fiber length of the fiber group. . The two cylindrical nets 13 and 14 have opposing circumferential surfaces 1
3a and 14a are rotationally driven so as to travel downward. 15 is a driving belt. Said 2
Pipe-shaped suction devices 16 and 17 are installed inside the cylindrical nets 13 and 14, respectively.
14, suction ports 16a and 17a are opened on the back side of the circumferential surface corresponding to a predetermined rotation angle α (30° to 60°) substantially above the straight line L connecting the rotation centers.
A static electricity generator 18 that generates high-voltage static electricity is connected to the circumferential surface of the cylindrical net 13 via a connecting terminal 19, and the circumferential surface of the other cylindrical net 14 is grounded via a connecting terminal 20. 21. Further, a fiber group supply device 22 is provided above the circumferential surfaces 13a, 14a facing the nets 13, 14, and a fiber group supplying device 22 is provided above the peripheral surfaces 13a, 14a facing the nets 13, 14, and a fiber group supplying device 22 is provided on the lower side of the rotation of the net 13 from the vicinity of the straight line L connecting the rotation centers of both the nets 13, 14. Rotation angle β (in this example, approximately
A conveyor belt 23 for sending out fiber groups, which runs in the same direction as the net 13 and is oriented at right angles to the center of rotation of the net 13, is provided in contact with the circumferential surface 13b corresponding to the angle 90 degrees. After the conveyor belt 23 comes out of contact with the peripheral surface 13b of the net 13, it is guided out of the device frame 12 in a substantially straight line, and the straight portion 2
A nip belt 24 is disposed in contact with the upper surface of the nip belt 3a, and the fiber group fed between the two nets 13 and 14 and from which the short fibers have been removed is conveyed while being sandwiched between the nip belt 24 and the circumferential surface 13b of the net 13. Then, it can be held between the nip belt 24 and sent out of the apparatus. The peripheral surface of the net 13 in contact with the conveyor belt 23 may have a corresponding rotation angle β of 90° or less.

The cylindrical nets 13 and 14 are made of a porous rubber sheet, a perforated metal plate, a metal net, or the like.

In the above-mentioned short fiber removing device 11, a high voltage (usually 30,000~30,000~
50,000 volts) was applied to both nets 13 and 14.
With the suction devices 16 and 17 on the inside of
If the fiber group is supplied from 2, the fibers F will be fed into both networks 13,
The fibers are arranged in a gradually elongated state between the gradually narrowing circumferential surfaces 13a and 14a of 14 due to electrostatic attraction and attractive force, and the fibers with relatively long fiber length are connected to each other and are arranged on both circumferential surfaces 13a. , 14a, and are held in point contact with the circumferential surface, without blocking the mesh, and the short fibers float back and forth between both circumferential surfaces 13a, 14a due to electrostatic attraction, forming a bridge-like structure. The suction devices 16, 17 pass through the mesh of both peripheral surfaces 13a, 14a from the suction ports 16a, 17a without being continuous.
is attracted to and eliminated. The long fibers are held between both circumferential surfaces 13a and 14a, and
14, and both peripheral surfaces 13a, 14a
The fibers are captured in a state arranged in the longitudinal direction between the circumferential surface 13b of the net 13 and the conveyor belt 23 near the narrowest point between them, and the fibers are held as they are and move forward. Surface 13b
After the fibers are brought out of contact with the fibers, they are conveyed between the conveyor belt 23 and the nip belt 24 and conveyed to the outside to remove short fibers and obtain a fiber bundle with very good fiber alignment in the longitudinal direction. Furthermore, each fiber of the obtained fiber group is not subjected to any mechanical force that would cause damage, and the quality does not deteriorate.

Effects of the Invention In the short fiber removal device of the present invention, the long fibers in the supplied fiber group are gradually removed by electrostatic attraction and suction between the gradually narrowing circumferential surfaces of two rotating cylindrical nets. The fibers are arranged while elongating, and are held in a continuous bridge-like manner between opposing meshes, with the ends of the fibers in point contact with the surrounding surface without blocking the meshes.
There is also very little suction through the mesh. Since the short fibers have a short fiber length, they float back and forth between the two circumferential surfaces due to electrostatic attraction, and are sucked into the suction device by the suction airflow from the mesh and expelled to the outside without continuing in the form of a bridge. In other words, short fibers can be removed extremely efficiently due to the synergistic effect of applying electrostatic attraction and suction between the opposing meshes. Furthermore, there is no mechanical force that would cut the fibers, causing no damage to the fibers, and no deterioration in quality as in the conventional method. Moreover, the fibers are arranged almost perpendicularly to the circumferential surface of the net and captured with good parallelism, and the fibers are sent out with the fibers arranged in the longitudinal direction, making it possible to obtain fiber bundles with excellent parallelism. Can be done.

[Brief explanation of drawings]

1 and 2 show a short fiber removing device according to an embodiment of the present invention, FIG. 1 is a schematic perspective view, FIG. 2 is a schematic side sectional view, and FIG. 3 is an explanatory diagram of a conventional example. , FIG. 4 is a schematic perspective view showing an example of a conventional device. 11... Short fiber removal device, 13, 14... Net,
16, 17... Suction device, 18... Static electricity generator, 22... Fiber group supply device, 23... Conveyor belt.

Claims (1)

[Claims] 1. Two rotatable cylindrical nets facing each other with a predetermined interval, a static electricity generator that applies high voltage static electricity between the two cylindrical nets, and the two cylindrical nets. a suction device disposed on the back side of the opposing surfaces of the cylindrical net, a fiber group supply device disposed on the upper side of rotation of the opposing portions of the two cylindrical nets, and the opposing portion of the two cylindrical nets. from near the center of the belt to a conveyor belt for sending out fiber groups, which is provided in contact with the peripheral surface on the lower side of rotation of one of the nets and runs perpendicularly to the center of rotation of one of the nets and in the same direction as the one of the nets. A short fiber removal device characterized by: