JPH0359163B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for producing a fibrous web and an apparatus for producing a fibrous web, which are used in a spinning process to obtain a fibrous web from which short fibers are removed from a group of fibers. .

In the present invention, short fibers refer to short fibers in the fiber group.
In the cotton 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, firstly, the short fibers that are usually mixed in a few percent or more in the raw fiber group are removed, and a fiber sliver consisting of fiber bundles that are as parallel as possible is produced. It is important to use this. The most common means of removing short fibers currently in use are mechanical methods such as carding or combing, which apply a pulling action or combing action to the fibers or fiber bundles held at one end. . Tandem cards, which consist of two carding machines connected together, are also used. In addition, recently, a group of fibers is supplied between the opposing surfaces of two rotating cylindrical meshes facing each other with a predetermined distance between them, while applying high voltage static electricity, and short fibers are sucked from the back side of the cylindrical mesh. A method using static electricity has been proposed in which fiber groups arranged in the longitudinal direction are pulled out in the form of a web from the surface on the lower side of rotation of one cylindrical mesh.
63-6571).

Problems to be Solved by the Invention Among the short fiber removal methods described above, mechanical means such as carding and combing tend to cause fiber breakage, and conversely short fibers and neps are removed at the same time as short fiber removal. As a result, it was difficult to reduce the short fibers below a certain limit, and there were also problems such as hooks in the fibers and poor parallelism. Also,
In a tandem card with two carding machines connected, the first
The web formed by the carding machine is fed to the second carding machine as a hook-shaped random web using a group of connecting rollers, etc., so the capacity of the carding machine cannot be fully utilized, and on the contrary, the fibers are Cutting occurs and short fibers increase, and neps cannot be significantly reduced.

On the other hand, when using static electricity, short fibers can be efficiently removed without causing any damage to the fibers due to the combined action of static electricity and suction airflow, and a fiber web with excellent alignment can be obtained without causing any hooks. . However, it is not possible to separate the neps in this fibrous web, and it is difficult to smooth out the crimps of the fibers to make the fiber surfaces smooth. Therefore, unlike traditional coma-frying, there are very few nets and dregs.
Moreover, it was difficult to form a fiber web with less crimp and smooth fiber surfaces.

The present invention solves the above problems,
A method for producing a fibrous web, which can remove more short fibers by static electricity and airflow, reduce crimping of single fibers, significantly reduce neps and dregs, and obtain a fibrous web with a smooth fiber surface, and the fibrous web The purpose is to provide manufacturing equipment.

Means for Solving the Problems In order to solve the above problems, the method for producing a fibrous web of the present invention involves splitting a group of fibers using a splitting device, and using two rotating While applying high-voltage static electricity to the opposing surfaces of the cylindrical nets, the split fiber group is supplied from the upper side of the rotation, the short fibers are suctioned and removed from the back side of at least one of the cylindrical nets, and one The fibrous web manufacturing apparatus is characterized in that a short fiber removal process is repeated at least twice, in which fiber groups arranged in the longitudinal direction are pulled out into a web shape by a conveyor belt from the surface on the lower side of rotation of the cylindrical net, and the fibrous web manufacturing apparatus a fiber group splitting device, rotatable cylindrical meshes facing each other at a predetermined interval, an electrostatic generation device for applying high-voltage static electricity between the two cylindrical meshes, and a static electricity generator for applying high voltage static electricity between the two cylindrical a suction device disposed on the back side of at least one of the opposing surfaces of the nets; a fiber supply device disposed on the upper side of rotation in the opposing portions of the two cylindrical nets; At least two short fiber removal devices are connected to the fiber separation device and are provided with a conveyor belt for sending out fiber groups, which is provided in contact with the periphery of one of the cylindrical nets on the downstream side of the rotation in the section.
The sets are installed in series.

Function In the above configuration, the fiber separation process is performed by a fiber separation device such as a carding machine, and the separated fibers are supplied to the opposing surfaces of two rotating cylindrical nets, and the fibers are separated by the action of static electricity and air current. The short fiber removal process using a short fiber removal device that can efficiently remove short fibers and obtain a well-aligned fiber web without hooks is repeated at least twice, and once the short fibers are removed using the short fiber removal device. The fiber web that has been removed and has good fiber arrangement without hooks is fed again to the fiber splitting device, so that fiber splitting can be carried out more thoroughly, neps and dregs can be further removed, and the next short fiber removal process can be carried out. It is possible to sufficiently remove short fibers, reduce crimping, and obtain a fiber web with a smooth surface similar to that obtained by combing.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a schematic side view showing a fibrous web manufacturing apparatus according to an embodiment of the present invention. The fibrous web manufacturing apparatus of the embodiment shown in FIG. 1 uses a carding machine as a fiber splitting device, and two sets of this carding machine and a short fiber removal device directly connected to the carding machine are directly connected in series. It is. That is, the first carding machine 1A and the second carding machine 1B have the same structure except that only the first carding machine 1A has a feed roller 2A, and has feed rollers 3A, 3B, cylinders 4A, 4B. , flat 5A, 5B, under casing 6A, 6
It has B. First and second short fiber removing devices 7A, 7B are installed in the vicinity of the position where the carding action is completed between the cylinders 4A, 4B and the flats 5A, 5B of these carding machines 1A, 1B, respectively.
Separation rollers 9A, 9 of fiber supply devices 8A, 8B of
B is placed. The fiber supply devices 8A, 8B
The separation rollers 9A, 9B separate the single fibers from the surfaces of the cylinders 4A, 4B, and the ducts 10A, 10B separate from the surfaces of the cylinders 4A, 4B and guide the fiber groups separated into single fibers to the next process. are doing.

Duct 10A of the fiber supply devices 8A, 8B,
The tips of 10B each have a short fiber removing device 7.
It faces the inside of the frames 7Aa and 7Ba of A and 7B. These short fiber removal devices 7A, 7B are constructed by two cylindrical nets 11A, 12A, 11B, 12 whose rotating shafts are arranged horizontally inside frames 7A, 7B, respectively.
B vertically and parallelly, and both peripheral surfaces 11Aa, 1
2Aa, 11Ba, and 12Ba are arranged to face each other at a predetermined interval in an adjustable manner, and both cylindrical nets 11A, 1
A straight line LA connecting the rotation axes of 2A, 11B, and 12B,
LB is at a right angle θ (approximately 20° to 30°) to the vertical line, and the lower cylindrical mesh 12A, 12B is connected to the cylinder 4A,
It is arranged at an angle so as to approach 4B. As for the predetermined interval, it is usually preferable that the interval 1 between both circumferential surfaces 11Aa, 12Aa, 11Ba, and 12Ba on the straight lines LA and LB is 1.5 to 2.5 times the effective fiber length of the fiber group. Cylindrical mesh 11A, 12A, 11
B, 12B are peripheral surfaces 11Aa, 12Aa, 1, respectively.
Three support rollers 1 are installed at both ends of 1Ba and 12Ba.
3Aa, 13Ab, 13Ac, 14Aa, 14Ab, 1
4Ac, 13Ba, 13Bb, 13Bc, 14Ba, 1
4Bb, 14Bc, and one support roller 13Aa, 14Aa, 13 therein.
The upper cylindrical nets 11A and 11B are driven and rotated by the support rollers 13Ab and 14Ba.
13Bb is connected to static electricity generators 15A, 15B, and support rollers 14Ab, 14Bb in the lower cylindrical nets 12A, 12B are grounded to serve as connection terminals 16A, 16B, respectively. Each support roller 13Aa, 13Ab, 13Ac, 14Aa, 14
Ab, 14Ac, 13Ba, 13Bb, 13Bc, 14
Ba, 14Bb, 14Bc are frames 7Aa, 7 respectively
Support arms 17A and 18 installed protruding from Ba
It is supported by A, 17B, and 18B. Both cylindrical nets 11A, 12A, 11B, 12B are attached at both ends to the left and right side plates of the frames 7Aa, 7Ba via thrust bearings (not shown) so that they can be freely inserted and removed in the direction of the rotation axis. It can be easily inserted and removed as needed for cleaning, inspection, replacement, etc.
Furthermore, both cylindrical nets 11A, 12A, 11B, 12
Inside B are pipe-shaped suction devices 19A, 20.
A, 19B, 20B are installed, and these suction devices 19A, 20A, 19B, 20B have suction ports 19Aa, 2 with opening degrees corresponding to predetermined angles α, β.
Cylindrical net 11 having 0Aa, 19Ba, 20Ba
A, 12A, 11B, 12B can be inserted and removed from the side like the cylindrical nets 11A, 12A, 11B, 12B, and has suction ports 19Aa, 20Aa, 19Ba, 20Ba with a desired opening degree for cleaning. You can easily exchange items. The cylindrical nets 11A, 11B, 12A, and 12B are preferably made of, for example, a metal porous plate, a metal net, a conductive porous rubber sheet, and have an outer diameter of 3 to 6 mm and an aperture ratio of 40 to 60%.

Furthermore, both cylindrical nets 11A, 11B, 12A, 1
Opposing peripheral surfaces 11Aa, 11Ba, 12Aa of 2B,
The ends of the ducts 10A, 10B of the fiber supply devices 8A, 8B face the upper side of the rotation of the fiber feeder 12Ba (left side in the drawing), and the cylindrical nets 11A, 11B face the lower side of the rotation from the straight lines LA, LB. Peripheral surface 11
One end is in contact with Aa, 11Ba, and the cylindrical mesh 11
Conveyor belts 21A and 21B running at the same surface speed as those of A and 11B are arranged in a direction intersecting the straight lines LA and LB, and one end is attached to the circumferential surface 11Aa, 11Ba of the cylindrical net 11A, 11B on the upper surface side. Nip belts 22A, 22B are provided which run in the opposite direction to the conveyor belts 21A, 21B in contact with each other.
It is possible to strip the fiber group from 11Ba in a web shape, sandwich it between both belts, and draw it out in a direction intersecting the straight lines LA and LB. In addition, these conveyor belts 21A, 21B and nip belt 22A,
22B are belt bodies 21Aa and 21, respectively.
Ba, drive rollers 21Ab, 21Bb, guide rollers 21Ac, 21Bc, bearings (not shown), belt bodies 22Aa, 22Ba, guide rollers 22Ab,
22Bb and bearings (not shown) are integrally formed,
Each belt can be inserted and removed as a unit from the front frame side in the running direction of each belt, and can be used for cleaning, adjustment,
Replacement etc. can be done easily.

Conveyor belt 2 of second short fiber removal device 7B
1B and the nip belt 22B, the frame body 7
A draft device 25 for drafting a web-like fiber bundle is disposed outside Ba with a guide 23 and a calender roller 24 in between. Draft device 25
In this embodiment, a 3-over-3-wire system is provided, but the other system used in the normal spinning process may be selected and installed as required.

Further, a sliver unevenness control device 26 is installed following the draft device 25. This sliver unevenness control device includes a measuring roller 26a and an adjusting roller 26b, and measures the thickness of the sliver S with the measuring roller 26a using a method similar to that used in conventional spinning processes. By adjusting the draft rate between the measuring roller 26a and the adjusting roller 26b according to the value, the thickness of the sliver S can be controlled and a fiber sliver of uniform thickness can be obtained. The sliver unevenness control device 26 may be provided inside the draft device 25, or may be of another type such as a photoelectric type used in a normal spinning process other than the measuring roller type.

In the above-mentioned series of devices, first, a group of fibers is fed to the first carding machine 1A by a wrap or the like using a feed roller 2A. Remove dirt, foreign matter, etc. On the other hand, a first short fiber removing device 7A is disposed at a position opposite to the take-in 3A of the cylinder 4A and where the carding action with the flat 5A has been completed.
The metallic clothing is attached to the surface of the fiber supply device 8A, and by rotation of the separation roller 9A, almost all of the single fibers held at the tip of the teeth of the cylinder 4A are removed.
100% is separated by the generated airflow and centrifugal force, and guided by the large airflow flowing forward through the duct 10A between the opposing surfaces of the two cylindrical nets 11A and 12A of the first short fiber removal device 7A. be able to. A high voltage (usually 30,000 to 50,000 volts) negative static electricity is applied to the fiber group, and both cylindrical meshes 11
While operating the suction devices 19A, 20A of A, 12A, and driving both the cylindrical nets 11A, 12A, the conveyor belt 21A, and the nip belt 22A, the circumferential surfaces 11Aa of the opposing portions of the cylindrical nets 11A, 12A, Supply between 12Aa. The supplied fibers are arranged in a gradually elongated state between the gradually narrowing circumferential surfaces 11Aa and 12Aa of both cylindrical networks 11A and 12A due to electrostatic attraction and the suction force of the air current, and the fiber length is increased. Relatively long fibers are connected to each other and form a bridge between both circumferential surfaces 11Aa and 12Aa, and are held in point contact with the circumferential surface without blocking the mesh, while short fibers are connected to both circumferential surfaces 11Aa and 12Aa. , 12Aa due to electrostatic attraction, and there is no bridge-like continuity between the two peripheral surfaces 11Aa and 12Aa.
It passes through the mesh and is sucked into the suction devices 19A, 20A from the suction ports 19Aa, 20Aa and is removed. The long fibers are held between both circumferential surfaces 11Aa and 12Aa, and move to the lower side together with both cylindrical nets 11A and 12A, and on the lower side near the narrowest point between both circumferential surfaces 11Aa and 12Aa, Circumferential surface 11 of mesh 11A
The fibers attach from Aa to one end 21Ad of the conveyor belt 21A, are caught in a state in which the fibers are arranged in the axial direction, are stripped off in a web shape, are held between the nip belt 22A, and advance in the direction intersecting the straight line LA. do. In this case, a web of arbitrary thickness can be obtained by adjusting the surface speed of the cylindrical nets 11A, 12A and the conveyor belt 21A.

The fiber web that has progressed while being held between the conveyor belt 21A and the nip belt 22A of the first short fiber removing device 7A as described above is continuously supplied to the second carding machine 1B, After combing and removing foreign matter in the same manner as for machine 1A,
It is supplied to the second short fiber removing device 7B. This second
The short fiber removing device 7B also operates in the same manner as the first short fiber removing device 7A, and uses static electricity and airflow to remove short fibers, arrange the fibers, and sandwich them between the conveyor belt 21B and the nip belt 22B. and send it out as a fiber web. In this case, the first carding machine 1A and the first short fiber removing device 7A split the fibers to remove impurities and remove short fibers to create a fiber web with no hooks and excellent alignment. Since the fiber web is fed to the second carding machine 1B, first of all, the second carding machine 1B further removes neps and dregs, and since there are no hooks and the fibers are well arranged, the fiber separation becomes easy and the fibers are cut. Since short fibers are removed, short fiber neps are less produced, neps and dregs are significantly reduced, and furthermore, the second short fiber removing device 7B
It is possible to almost completely remove short fibers, neps, dross, etc., and obtain an excellent fiber web with no hooks, significantly reduced crimps, and extremely well-aligned fibers in the same condition as conventional combing. It can be used as it is, for example, as a sliver for an open-end spinning machine, and the influence of micro dust in the rotor can be significantly reduced, making it possible to produce high-quality yarn.

In this embodiment, the second short fiber removing device 7
B conveyor belt 21B and nipple belt 22
The fiber web that is fed out after being clamped between guides B and B is
3, the calender roller 24 pulls it out as a thick web, the draft device 25 drafts it at a large magnification (usually 4 to 8 times) to make a thin web, and the sliver S is converged and the sliver is continuously controlled. The thickness of the sliver S is measured by the measuring roller 26a, and the thickness of the sliver S is measured by the measuring roller 26a based on the data.
The draft rate is adjusted between the coiler 27 and the adjusting roller 26b to make the sliver S of uniform size.
It is then stored in the can 28. In some cases, the conveyor belt 21B and the nip belt 22B may
After passing through the calender rollers, the fibrous web that is clamped and sent out is processed without draft or uneven control.
It is also possible to immediately pass through the coiler 27 and store it in the can 28.

In the above embodiment, two sets of a carding machine and a short fiber removing device were installed, but three or more sets may be installed as necessary.
Furthermore, it is possible to obtain a fiber web with a good arrangement of extended crimps. In addition, in the method for manufacturing a fibrous web in the above embodiment, a fibrous web manufacturing apparatus in which two sets of carding machines and short fiber removing devices were installed in series was used. It may be supplied and processed. Furthermore, although a carding machine is used as the fiber separating device in the above embodiment, other devices having a fiber separating function such as a fiber separating roller may be used.

Effects of the Invention As described above, in the fibrous web manufacturing method and fibrous web manufacturing apparatus of the present invention, after fiber separation is performed using a fiber splitting device such as a carding machine, short fiber removal processing is performed using a short fiber removal device. By repeating the above operation at least twice, the short fibers have been removed by the action of static electricity and airflow by the short fiber removal device, and the fiber web with good fiber arrangement without hooks is fed again to the fiber splitting device. It is possible to further thoroughly separate the fibers and almost completely remove neps and dregs.Furthermore, the short fiber removal device can also sufficiently remove short fibers, further reduce crimps, and there is no hook and the alignment is extremely fine. It is possible to obtain a fiber web with a smooth surface similar to that obtained by combing, and it exhibits exceptional effects such as being able to feed yarn as it is to an open-end spinning machine to obtain yarn of very high quality.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing a fibrous web manufacturing apparatus according to an embodiment of the present invention. 1A, 1B...Carding machine (fiber splitting device), 7A, 7
B... Short fiber removal device, 8A, 8B... Fiber supply device, 11A, 12A, 11B, 12B... Cylindrical mesh, 15A, 15B... Static electricity generation device, 19
A, 20A, 19B, 20B...Suction device, 21
A, 21B...Conveyor belt.

Claims (1)

[Claims] 1. The fiber group is separated by a fiber separation device, and the rotating cylindrical nets are rotated while applying high-voltage static electricity to the opposing surfaces of two rotating cylindrical nets facing each other at a predetermined interval. The separated fiber group is supplied from the upper side, short fibers are suctioned and removed from the back side of at least one of the cylindrical nets, and the fiber group is arranged in the longitudinal direction from the rotationally lower side surface of one of the cylindrical nets. 1. A method for producing a fibrous web, which comprises repeating at least twice a process of removing short fibers by drawing the fibrous material into a web using a conveyor belt. 2. A fiber group splitting device, rotatable cylindrical meshes facing each other at a predetermined interval, a static electricity generation device that applies high-voltage static electricity between the two cylindrical meshes, and the two cylindrical meshes. a suction device disposed on the back side of at least one of the opposing surfaces of the two cylindrical nets; a fiber supply device disposed on the upper side of rotation in the opposing portions of the two cylindrical nets; a conveyor belt for sending out fiber groups provided in contact with the circumferential surface of one of the cylindrical nets on the downstream side of rotation in the opposing part, and a short fiber removing device connected to the fiber splitting device, At least two sets of fibrous web manufacturing equipment installed in series.