JPS6059128A - Friction spinning apparatus - 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 friction spinning, particularly the application of a vacuum to hold formed yarns on a perforated surface in a friction spinning process.

Various proposals have been made for friction spinning of conventional yarn.
In particular, mention may be made of the applicant's British Patent Publication No. 2,042,599 A (filed for the first time under the name Zorat Saco Rounil) and various proposals by Dr. Ernnut Heerer, Barmag Perm and Vicmini Ustav Babinarski.

In general, the friction spinning process spins a stream of airborne individual fibers between two surfaces moving in opposite directions, such as between the surfaces of two adjacent rollers rotating in the same direction, or between the surfaces of two adjacent rollers rotating in the same direction, or between two surfaces moving in opposite directions, or between the surfaces of two adjacent rollers rotating in the same direction. The method consists of directing the roller between the inner surface of the drum and the outer surface of a roller mounted eccentrically in the drum.

British Patent Publication No. 2,023,196 A (Vytskmini Ustav Babinarsky) shows in Fig. 16 that the porous internal drum has various hole distributions so that the number density of holes increases in the direction of thread withdrawal. I am changing it to However, there is no indication that the pressure drop across each hole is not constant.

No. 4,168,601 (Didek et al.).

Vytskmini (assignee to Ustav Babinarsky) increases the "absorption effect" along the thread withdrawal direction, and this increase is achieved by increasing the size of the absorption holes passing through the weaving roller in the thread withdrawal direction. points are listed. Although it is clear that larger holes provide a larger cross section for air flow through the holes (and even higher air velocities resulting in increased overall pressure on the holes), this No need for varying static pressure across the drum.

In contrast, in the friction-spun yarn 11M obtained according to the present invention, the static pressure difference that maintains the fiber tabs forming the yarn in contact with the porous friction-spinning surface is smaller at the tip of the yarn at a downstream position.

It is believed that static pressure is the key variable in single step yarn formation, although it is of course possible to vary the air flow rate and/or air velocity with this significant increase in static air pressure.

When the applied static pressure increases along the thread withdrawal direction,
Static pressure on the brittle tip occurs where most of the fibers are brought together near the tip of the forming thread and where the overall fiber matrix already increases its structural integrity. less than the pressure exerted on the downstream part. By preventing an excessive static pressure difference from being applied near the small weak tip of the downstream weft cross section of the thread, occurrence of breakage during winding of the thread, resulting in breakage of the thread, and the need to renew the device can be reduced.

Furthermore, the friction spinning device obtained according to the present invention includes at least one
With a movable cooperative surface perforated on two sides.

a suction device that generates different static pressures at different positions along a line perpendicular to the direction of movement of the perforating face, and a suction device that generates different static pressures at different positions along a line perpendicular to the direction of movement of the perforating face, and a thread being drawn from the cooperating face along a thread forming line parallel to the line of the different pressure positions. The static pressure enclosing the drawing device and acting through the porous surface is reduced in the thread drawing direction so that at the tip of the forming thread there is a weaker suction in the downstream part.

The details of the invention will now be described by way of example with reference to the accompanying drawings.

The apparatus shown in the drawings is described in the above-mentioned British Patent Application No. 2.0 of the applicant.
42.599 Must be of the type shown in A,
The contents thereof are cited herein. Therefore, a description of the important parts of the friction spinning machine, such as the fiber opening device and the fiber feed conduit to the rollers, will be omitted in this application. The characteristics of these parts are described in the above-mentioned patent application No. 2.042,59.
9A, and because the invention relates to applying variable static pressure to a thread, only those components that differ from corresponding parts in Applicant's prior art references will be illustrated and described.

The friction spinning device 1 shown in FIG. The roller 3 is mounted in close proximity to and juxtaposed with the roller 3. These holes are shown exaggerated in size for purposes of illustration.

The interior of the foraminous roller 2 has linear pores 13 defining suction pores running parallel to and adjacent to the sandwich between this roller and the imperforate cooperating roller 23. 1st
Or there is an intermediate sleeve 12.

A sixth or inner sleeve 4 mounted within the hollow roller 2 is formed with six perforated sections 5, 6.7 extending parallel to the axis pointing towards the scissors between the rollers 2 and 3; 5
, 6.7 and the holes 2a of the overlapping portions of the rollers 2 with holes, suction can be applied to attract the fibers toward the scissors between the two rollers 2 and 3.

The suction applied to the perforated portion 5 leads from a suction source 11 via a suction conduit 8 which extends coaxially with the hollow roller 2 . This suction pipe 8 opens into all six of the pore sections 5.6.7.

Suction from the Zakujon conduit 8 is carried out through the six pore sections 5.6.
7, but the left-hand pore section 5 is subjected to suction without any attenuation, whereas the central pore section 6 has four equidistant intervals formed in its floor. through the hole 6a (of the first diameter),
Similarly, suction is applied to the pore section 7 through the bed via four equally spaced holes 7a of a second diameter smaller than the hole 6a.

As a result, a static pressure is generated in the left pore section 5 that is lower than the static pressure in the center pore section, and the static pressure in the center section is the same as that at the delicate tips of the fibers forming the thread. The pore molecules on the right are lower.

In one preferred embodiment, the six pore sections 5.6.1 have the same length, for example 40 mm, the hole 6a has a diameter of 6 mm and the hole 7a has a diameter of 2 mm. This result example is 254
Suction equal to mm (10 inches) water column gauge pressure (2.5 kilopascals) is applied to pore section 7a, suction equal to 508 mm (20 inches) water column gauge pressure (5 kilopascals) is applied to pore section 6a, the left side The pore portion 5 has a diameter of 762 mm (3
0 inches) water column gauge pressure (7.5 kilopascals) is obtained.

As an alternative to the above, the floor of the pore section 6 is also left open, so that along two of the six pore-forming lengths 5.6.7 of the sleeve 4, 762 h. It is possible to apply high suction of gauge pressure (7.5 kilopascals).

It will be appreciated that due to the holes 6a and 7a, the fluid flow paths from the pore sections 6 and 7 are constricted differently and to a different extent compared to the flow path from the pore section 5.

It is important to make sure that the static pressure inside the sleeve at the right end (the suction is stronger there) is also lower at the point where the tip of the brittle fiber tab on the left end is placed. subject to a minimum suction force, just enough to maintain contact with the surface.

On the other hand, the suction effect is stronger in the direction 9 of pulling out the yarn between the twist blocking pull-out rollers (not shown) through the raising tube 10 shown schematically along the surface of the roller 2, and the fiber tab forming yarn and small holes are provided. It is ensured that a normal reaction of friction imparting occurs which exerts maximum friction and therefore maximum twisting motion on the yarn between the surfaces.

Although the precise mechanism by which the present invention achieves its highly advantageous effects is not completely understood.

The entire fiber tab and the adjacent ends of the yarn act as a continuous cylindrical body rotating against a slight twist blocking device, such as a pull-out roller, which gives the actual weft to the yarn and performs the spinning operation. It is believed that. The suction effect serves to maintain the desired friction between surface 2 and the fiber tab and thus draws the yarn into the scissors between surface 2 and the imperforate surface 3 which also imparts a frictional movement to the yarn. As a side effect, the maximum suction effect is achieved at the end of the fiber bundle where all the fibers are now attached (i.e. the end closest to the drawing device), and the tip of the fiber bundle is completely removed. It is advantageous to make the suction effect economical by not exposing it to suction effects. This also has the important advantage of avoiding exposing the fragile tip to the effects of high suction as well as high friction, which tend to fracture it.

3 to 5 show the inner sleeve according to the second embodiment.
4. In this case, are the suction holes five separate pore parts? 5.16.17, these pore portions are the same as the pore portion 5.6.7 in FIGS. There is. In this example, pore sections 15 and 16 are completely open, while pore section 17 is provided with five holes 17a and a fourth hole 17b having a smaller diameter.

Therefore, the static pressure at the surface of the outer sleeve 2 that directly coincides with the pore areas 15 and 16 is fairly uniform, whereas the static pressure where it coincides with the pore area 17 is close to atmospheric pressure (i.e. there is no significant suction). ] is non-uniform in that a value close to atmospheric pressure occurs just radially outward of the minimum diameter +L171) on the right side.

The sleeve 14 has pore sections 15, 16, 17; 6 pore sections 1B, 19 on the side diametrically opposite to the side on which they are formed;
．． There are 20 similarly spiral-shaped separation pores.

The sleeve 14 according to this second embodiment is shown in FIGS.
The advantage over the first embodiment 4 of the figure is that the sleeve can be rotated by 180° and the two pores, i.e. the static pressure, changes along the suction arch 10. Or the second suction pore 1B, 19.20 with a suction force of ttxq-
The point is that it can express one force or the other.

In this example, one of the two types of pores has a uniform static pressure, but instead both pores have varying static pressures, but in different patterns. It is also possible to construct the reeds as shown, and to have more than two helical pores, to provide different static pressure patterns that can be applied to the surface of the outer sleeve 20 defining the perforated roll of the friction spinning device. It is likewise possible to configure each pore to have .

By using the perforated sleeve type shown in Figures 3, 4 and 5, the different suction pores can be attached to the perforated roller by simply rotating the inner sleeve without disassembling the entire device. Intermediate sleeve of assembly (not shown in Figure 1)
It is possible to change the static pressure pattern along the perforated friction spinning row 22 by placing it in the pores of the perforated friction spinning row 22.

A similar effect due to the helical configuration of the pores shown in FIGS. 6 and 4 and 5 and the different widths of the pore sections 5, 6.7 shown in FIG. or when 14 cooperates with an intermediate granking sleeve 12 with pores 13 arranged straight along the generatrix of the intermediate sleeve (as described in the applicant's published European Patent Application Nos. 0.034.427 and 0.05).
2.412, it is possible to apply suction progressively along the pores of the granking sleeve.

Therefore, the present invention provides a method that is more reliable against the occurrence of yarn breakage, and is carried out without necessarily changing the size of the holes along the perforated row 22 or the density of the number of holes 2a. However, if desired, it is possible to vary the static pressure on the yarn as well as other parameters of size and number density without departing from the scope of the invention.

[Brief explanation of drawings]

1 is a partially sectional top view of a friction spinning roller of a friction spinning machine according to the invention; FIG. 2 is a side view of the internal sleeve of the perforated roller of FIG. 1; and FIG. A side view of a second embodiment of the inner sleeve shown, FIG. 4 taken along line 4-- of FIG.
4, and FIG. 5 is a cross-sectional view taken along line 5--5 of FIG. 1: Friction spinning device; 2: Roller with small holes; 2a: Small diameter holes; 3: Roller without holes; 12: Middle sleeve: 1
3: Linear pore; 5, 6, 7: Pore portion; 8:
Suction conduit: 11: Suction source; 9: Thread withdrawal direction; 10: Turn-up tube; Agent: Hajime Asamura

Claims (1)

Claims: (1) cooperating movable surfaces (1, 2) in which at least one surface (2) is perforated; and a suction to be applied through said at least one perforated surface; Vacuum suction device (
4, 11) (14, 11) and a friction spinning device having a device for drawing out the filament in the cooperating surface filament forming line, the static pressure in the drum is perpendicular to the direction of motion of the perforated surface. Different positions along the line (5, 6, 7) (15
, 16° 17), and the tip of the forming thread (7) (
17) A friction spinning device characterized in that in the downstream part (5), the suction is much weaker in the direction of yarn withdrawal so that a weaker suction than in (15) is applied to the perforation surface. (2. In the friction spinning apparatus according to claim 1, some regions (5, 6, 7) (15 ,16,
1? ). (3) In the friction spinning device according to claim 2, the regions of different or constant static pressure are formed by isolated pores along the line of the body behind the perforated surface. sections (5, 6, 7) (15° 16.1 γ), the difference in static pressure results in a differently constricted fluid flow from each of said pore sections towards the suction source (11). (4) A friction spinning device according to claim 6, characterized in that the suction device has the body (4) (14) and the suction source (11). , at least one pore section (6 or 7) (17) has a pore (6a) having a constricted flow path connecting said pore section to the suction source (4) (14) and from the pore section. or 7a)(1
7 &). (5) The device according to claim 6 or 4, wherein the isolated pore portion defines a first pore (15-17) along the bore (14). . A second pore designed differently from the static pressure pattern generated by the first pores, which is defined along different lines, is generated on the outer surface of the perforated surface (2).
It has pores (18-20). Apparatus, characterized in that the first or second pores are aligned with the thread forming line by rotating the body (14) between a first position and a second position. (6) A friction spinning device according to any one of claims 6 to 5, wherein said perforated surface is defined by a perforated outer sleeve (2) and said body (4).
) (14) is the pore portion (5°6.7) (15,16
, 17), radially outward of said inner sleeve and radially inward of said perforated sleeve, said intermediate granking sleeve having an intermediate granking sleeve (12)'e; 12), each of the pores (5-T) (15-17) of the inner sleeve has a y-helical shape. A device characterized by being placed. (7) A friction spinning device according to any one of claims 1 to 6, wherein only one of the surfaces (two
) are drilled and associated suction devices (4°11) (14,
11), and the other said surface is not perforated. (8) An apparatus according to any one of claims 1 to 7, characterized in that the friction spinning surface is the outer surface of parallel cylindrical rollers (1, 2). (9) The difference in static pressure across the fibers that keep the fibers forming the yarn in contact with the perforated friction spinning surface (2) is determined by the difference in static pressure across the fibers forming the yarn at the tip CT) C11). A friction spinning method characterized by a lower position at the downstream position (5, 15). (11 Friction spinning method e according to claim 9) (Thus, the areas (7) and (17) of constant static pressure difference at the tip of the fiber bundle and across the fiber bundle and the yarn at the downstream position A method characterized in that there is a region (5) (15) of a constant higher static pressure difference across the dazzling light in a part of the region.