WO2021214680A1

WO2021214680A1 - Card wire

Info

Publication number: WO2021214680A1
Application number: PCT/IB2021/053285
Authority: WO
Inventors: Christian Dratva; Giuseppe Lombardo; Christine WÖRNER
Original assignee: Graf + Cie Ag
Priority date: 2020-04-23
Filing date: 2021-04-21
Publication date: 2021-10-28
Also published as: CH717341A1; EP4139511A1; CN115885065A

Abstract

The invention relates to a card wire (1) for cylinders of a textile machine having a total height (h₁) and having a multiplicity of successively arranged teeth (2, 3) with a tooth depth (h₆). Each tooth (2, 3) has a tooth face surface (4), a tooth back surface (5) and a tooth tip (6). The tooth back surface (5) of a tooth (2) transitions, at an opposite end from the tooth tip (6), into a tooth base surface (7), which subsequently transitions into the tooth face surface (4) of an adjacent tooth (3). The tooth base surface (7), starting from the tooth back surface (5), has a first portion (8) with a planar or concave shape and a second portion (9), following the first portion (8), with a convex shape.

Description

Trim wire

The present invention relates to a clothing wire for rolls of a textile machine. All-steel clothing or clothing wires are used in various areas of processing textile fibers. The present invention relates to a clothing wire for use on rollers in fiber processing processes, in particular on carding or carding rollers. When used on rollers, the Garni turdraht is in the form of a sawtooth all-steel fitting helically and closely adjacent to one another or wound in grooves on the roller. Usual forms of sawtooth all-steel fittings are given in the international standard ISO 5234 (2004). According to the standard, all steel sets are characterized, among other things, by their working angle a, their back angle g, their tooth pitch p and the tooth depth h6, the total height of the wire hi and the length of the tip surface I. The working angle is the angle between the front surface of a tooth and the perpendicular to the wire base, where the chest surface, seen in the direction of movement, represents the front tooth surface. Instead of the wire base, a connecting line between two tips can also be formed, in which case the working angle is the angle between the front surface of a tooth and the perpendicular to the connecting line. If the chest angle a is equal to zero degrees, the chest surface is perpendicular, or vertical, to the wire base. In the present description, the back angle g is the angle between the back surface and the perpendicular to the wire base or to the connecting line, the back surface representing the rear tooth surface, seen in the direction of movement. If the back angle g is equal to zero degrees, the back surface is perpendicular, or vertical, to the wire base. For the purposes of the present description, neither the back surface nor the chest surface are necessarily straight surfaces, but can be convex or concave, or provided with grooves or grooves, or formed from several angled surfaces, or represent a combination of these training forms.

In fiber processing processes such as opening and cleaning fibers or fiber flakes, high demands are placed on the all-steel clothing or clothing wires used, in particular with regard to efficient parallelization of the fibers in the carding process or a fiber transfer between different rollers without causing damage to the fibers. The condition for this is that the fibers should be guided as far as possible on the surface of the clothing. The fiber transfer from a first roller to a further roller is also very important. In the case of a card, this applies above all to the clothing wire applied to the drum. This essentially determines the fiber transfer from the feed roll to the drum as well as the fiber transfer from the drum to the doffer and the fiber guidance in the carding process.

Known from the prior art is a variety of formations of clothing wires. For example, CN 105839236 A and CN 205035 530 U disclose a clothing wire with a tooth base surface that rises towards the chest surface of a tooth. The tooth base adjoins the back surface and, due to the rising shape, raises the transition to the chest surface of the following tooth compared to the wire base. A similar shape of a tooth base surface in its course from the back surface of a tooth to the chest surface of a subsequent tooth is disclosed in DE 102016 114622 A1. The disadvantage of the disclosed embodiments is that, due to the continuous increase in the tooth base area, the fibers to be processed are raised by the movement of the clothing wire without a definition of a nonwoven layer resulting from the fibers. The fibers are guided up a little, but are distributed over the entire increasing area of the tooth base. As a result, the fibers to be processed are only partially lifted from the lowest point of the tooth base, which has an additional disadvantageous effect on the efficiency of the fiber transfer.

It is the object of the invention to create a clothing wire, which allows a fiber guide on the surface of the clothing wire by defining a fiber fleece plane between the lowest point of the tooth base and the tooth tips of the clothing wire.

The object is achieved by the features in the characterizing part of the independent claim. To solve the problem, a clothing wire for rollers of a textile machine, in particular a special card or card with a total height (hi) and a plurality of teeth arranged one behind the other with a tooth depth (IΊQ) is proposed, each tooth having a tooth face, a tooth back face and a Has tooth tip and the tooth back surface of a tooth merges at an end opposite the tooth tip into a tooth base surface, which subsequently merges into the tooth face surface of an adjacent tooth. Starting from the tooth back surface, the tooth base has a first section and a second section following the first section, the first section being designed with a flat or concave shape and the second section with a convex shape.

Due to the convex design of the second section of the tooth base surface, the fibers are raised discontinuously above this second section. The increase he follows due to the convex design of the tooth base in a first part with a high slope and in a second part with a lower slope. As a result, the fibers collect in the part with the slight slope and form a fiber fleece. Due to the convex formation of the tooth base, the fibers pass for the most part over the steep slope and collect in a non-woven layer that is set above the lowest point of the tooth base. A fiber transfer is also facilitated by the fact that the fibers are not distributed over the entire depth of the tooth, but rather collect in this defined fiber fleece plane. The radial area of the clothing in which the largest proportion of the fibers transported through the clothing wire is located is referred to as the fiber fleece plane.

The tooth base has a third section following the second section, the third section being arranged parallel to a connecting line of the tooth tips of two teeth arranged one behind the other. The third section increases the extent of that part of the tooth base in which the fiber fleece plane is located. The fibers thus reach the fiber fleece plane more easily, since in the area of the low slope in the convex section of the tooth base surface there is no fiber congestion even with high production. Another benefit shows themselves in the manufacture of the wires. Due to the difficulty of forming the tooth base as close as possible to the wire root in order to improve filling behavior with low tooth height, the new geometry enables a greater distance between the tooth root and the wire root due to the elevation.

In an alternative embodiment, the tooth base has a third section following the second section, the third section in a range from plus 20 to minus 20 degrees, preferably from plus 10 to minus 10 degrees to a perpendicular to the line connecting the tooth tips of two is arranged towards one another arranged teeth. By arranging the third section in a plane approximately perpendicular to the connecting line, the thickness of the fiber fleece plane can be defined over the length of this section. There is also a definition of the height at which the fiber fleece plane is arranged opposite the tooth tip.

The tooth depth in the first section is preferably 10% to 50% of the total height of the wire. The determination of the tooth depth depends on an intended production height, a place of use of the clothing wire and the fiber material to be processed. Typically clothing wires for drums of cards in an application for cotton with a high production have a tooth depth of 0.8 mm with a total height of the wire of 2.5 mm. A tooth depth less than 10% of the total height of the wire means that the clothing wire is stiff and therefore difficult to apply to a roller. Correspondingly, a set wire with a tooth depth of more than 50% of the total height of the wire becomes soft and the tooth tips are deformed due to the great length of the individual teeth due to the stress caused by the fibers and in particular the dirt particles adhering to the fibers.

In order to enable a significant elevation of the fiber fleece level against the tooth tips, a tooth depth at an end of the second section opposite the first section is advantageously 15% to 60%, particularly preferably 20% to 50%, less than the tooth depth in the first Section. This makes it possible to raise the majority of the fibers from the tooth base and improve their processing. A fiber transfer from one garnished element to the next is also more efficient if the nonwoven fabric formed from the fibers in the clothing wire is not in the tooth base. For example, the improved fiber transfer from the drum to the take-off roller in a card results in an increase in carding performance, since no fibers that have already been carded get stuck in the drum clothing and thus circulate several times. An improvement in the card sliver quality can also be achieved in its parallelization due to a less aggressive transfer of the fibers to the take-off roller. This reduces the compression of the fibers in the doffer clothing and also reduces the fibers tearing away from the drum clothing.

In a further development, the tooth tip has a tooth tip surface with a length of 0.5 mm to 2.0 mm. The design of a tooth tip with a tooth tip surface has advantages in terms of wear and tear on the tooth tip and the resulting need to grind the tooth tip. If the tooth tip is designed without a tooth tip surface, a tooth tip surface is formed as a result of the process after the first regrinding. The teeth are re-ground with a grinding roller, which means that the tips of the teeth are flattened. If tooth tip surfaces are already provided from the start, it can be achieved that the behavior of the clothing wire does not change over its lifetime.

The tooth face surface preferably has a working angle a of 30 to 50 angular degrees and the back surface of the tooth has a back angle g of 40 to 60 angular degrees. The total height of the wire is preferably 0.5 mm to 1.5 mm. A radius of 0.05 mm to 0.5 mm is particularly preferably formed in a transition from the tooth base surface to the tooth face surface. Garment wires with geometric shapes in these areas in terms of total height, working and spine angles and the formation of the transitions from one surface to the next are particularly suitable for rolls of high-performance cards. The high-speed rollers of high-performance cards form a comparatively thin nonwoven fabric on their circumference when processing fibers, compared to slow-running machines. Smaller roller diameters are also used, which requires a high degree of flexibility from the clothing wires when they are installed. In an alternative embodiment, which is used in particular for carding, the total height of the wire is 2.0 mm to 5.0 mm. A radius of 0.5 mm to 2.0 mm is preferably formed in a transition from the tooth base surface to the tooth chest surface in this embodiment. Garment wires with geometrical formations in these areas in relation to the total height and formation of the transitions from one surface to the next are particularly suitable for carding rollers, which tend to rotate slowly and are larger in diameter than carding rollers.

The clothing wire is designed as an all-steel wire and can be designed with a normal, interlocked or linked foot to enable it to be pulled onto a smooth roller or in grooves.

The clothing wire is suitable for rolls of textile machines and in particular for garnished rolls of cards such as drums. When using the clothing wire on a roller, it is drawn up in a spiral.

In the following, the invention is explained on the basis of exemplary embodiments and explained in more detail by means of drawings.

Figure 1 Schematic representation of a first embodiment of a Garniturdrah tes according to the invention;

Figure 2 is a schematic representation of a second embodiment of a Garniturdrah tes according to the invention;

Figure 3 is a schematic representation of a third embodiment of a Garniturdrah tes according to the invention and

FIG. 4 Schematic representation of a cross section at point X in FIG. 2

Figure 1 shows a schematic representation of a first embodiment of a clothing wire 1 according to the invention. The illustrated section of a clothing wire 1 shows a wire base 14 and on the opposite side in a longitudinal direction 15 teeth 2, 3 arranged one behind the other. When the clothing wire 1 moves, the teeth 2, 3 transport the fibers 16 in its longitudinal direction 15. The teeth 2, 3 are arranged regularly and identical in shape along the clothing wire 1. The clothing wire 1 has a total height hi and the teeth a tooth depth h6. The tooth depth h6 extends in each case from a tooth tip 6 to a deepest point of a tooth base surface 7.

Each tooth 2, 3 has a tooth tip 6. The tooth tip 6 with its front side of the tooth 2, 3 forms the so-called chest surface 4. The chest surface 4 is inclined relative to the perpendicular to the wire base 14, or to a connecting line 11 between two adjacent tooth tips 6, by the working angle a. A back surface 5 inclined by a back angle g from the perpendicular to the wire base 14 or a connecting line 11 between two adjacent tooth tips 6 is arranged from the tooth tip 6 opposite the chest surface 4.

In the direction from a first tooth 2 to a second tooth 3 starting at the tooth tip 6 of the first tooth 2, the back surface 5 runs inclined in the direction of the wire base 14 and merges into a tooth base surface 7. The tooth base surface 7 in turn adjoins the chest surface 4 of the second tooth 3 at its end remote from the back surface 5. The chest surface 4 in turn leads to the tooth tip 6 of the second tooth 3. The tooth base surface 7 has a first section 8 which, in the embodiment shown, runs parallel to the connecting line 11 in one plane and then merges into a second section 9. The second section 9 has a convex design which ends at the chest surface 4 of the second tooth 3. The tooth depth h6 in the first section 8 is reduced in the second section to the tooth depth k. The convex shape of the tooth base 7 in the second section 9 results in a discontinuous reduction in the tooth depth hi from the first section 8 to the end of the second section 9 such that the reduction increases sharply at the beginning of the second section 9 and towards the end of the second section 9 decreases again. Neither the increase in the reduction nor the decrease in the reduction is continuous, which contributes to the fact that there is a fiber fleece plane 17 in the region of a transition from the second section 9 of the tooth base 7 to the chest surface 4. the Transitions from the back surface 5 to the first section 8 of the tooth base 7 as well as in the further course from the first section 8 to the second section 9 and from the second section 9 to the chest surface 4 are shown rounded. For fiber processing, the most important transition is the connection of the tooth base 7 to the chest surface 4, which is designated with a radius 13.

In a second and third embodiment according to FIGS. 2, 3 and 4, the same reference numbers have been used for the same features as in FIG. In the following, the specific design of the clothing wire 1, in contrast to the embodiment according to FIG. 1, is described and a repetitive description is dispensed with.

The second embodiment according to FIG. 2 differs from the first embodiment according to FIG. 1 in that the first section 8 of the tooth base surface 7 has a concave shape. In addition, the second section 9 of the tooth base 7 is followed by a third section 10 which subsequently merges into the chest surface 4 of the following tooth 3. The third section 10 is arranged parallel to the connec tion line 11, as a result of which a fiber fleece plane 17 can form on this section 10 of the tooth base 7. In addition, the tooth tip 6 is formed with a tooth tip surface 12 with a length l.

The third embodiment according to FIG. 3 differs from the first embodiment according to FIG. 1 in that the first section 8 of the tooth base surface 7 has a concave shape. In addition, the second section 9 of the tooth base 7 is followed by a third section 10 at which subsequently merges into the chest surface 4 of the following tooth 3. The third section 10 is arranged at an angle to the connecting line 11 of the tooth tips 2, 3. The angle is selected such that the alignment of the third section 10 of the tooth base surface is arranged perpendicular or at least almost perpendicular to the connecting line 11. This Formge environment results in a kind of pocket in the area of which the nonwoven layer 17 is formed. FIG. 4 shows a schematic representation of a cross section at point X in FIG. 3. The clothing wire 1 has a total height hi from the wire base 14 to the tooth tip 6 and a tooth depth h6 from the tooth base 7 to the tooth tip 6. The garniture wire 1 is tapered in its course from the wire base 14 to the tooth tip 6 in a section in which the teeth are formed. The clothing wire 1 has a width bi on the wire base 14 and a width b3 on the tooth tip 6.

The present invention is not limited to the illustrated and described exemplary embodiments. Modifications within the scope of the claims are just as possible as a combination of the features, even if these are shown and described in various exemplary embodiments.

Legend

1 set wire

2 tooth

3 tooth

4 tooth face

5 tooth back surface

6 tooth tip

7 tooth base

8 First section of the tooth base

9 Second section of the tooth base

10 Third section of the tooth base

11 Connection line between two adjacent tooth tips

12 tooth tip surface

13 radius

14 wire base

15 longitudinal direction

16 fiber

17 Nonwoven layer a working angle

Y back angle of the first tooth tip hi total height of the wire h6 tooth depth bi wire width b3 tooth tip width k tooth depth

I Length of tooth tip surface

Claims

1. Set wire (1) for rollers of a textile machine with a total height (hi) and with a large number of teeth (2, 3) arranged one behind the other with a tooth depth (Hö), each tooth (2, 3) having a tooth face (4) , a tooth back surface

(5) and a tooth tip (6) and the tooth back surface (5) of a tooth (2) at an end opposite the tooth tip (6) merges into a tooth base surface (7), which subsequently into the tooth chest surface (4) of an adjacent one Tooth (3) passes over, and wherein the tooth base surface (7), starting from the tooth back surface (5), has a first section (8) and a second section (9) following the first section (8), the first Section (8) are designed with a flat or concave and the second section (9) with a convex shape, characterized in that the tooth base surface (7) has a third section (10) following the second section (9), wherein the third section (10) parallel to a connecting line (11) of the Zahnspit zen (6) of two consecutively arranged teeth (2, 3) or in a range of plus 20 to minus 20 degrees to a perpendicular to the connecting line (11) of Tooth tips (6) two r teeth arranged one behind the other (2, 3) is angeord net.

2. clothing wire (1) according to claim 1, characterized in that the tooth depth (h6) in the first section (8) is 10% to 50% of the total height of the wire (hi).

3. clothing wire (1) according to any one of the preceding claims, characterized in that a tooth depth (k) at one of the first section (8) opposite end of the second section (9) is 15% to 60% less than the tooth depth (h6) in the first section (8).

4. clothing wire (1) according to claim 1, characterized in that the tooth tip

(6) has a tooth tip surface (12) with a length (I) of 0.5 mm to 2.0 mm. 5. clothing wire (1) according to any one of the preceding claims, characterized in that the tooth face (4) has a working angle (a) of 30 to 50 angular degrees and the tooth back surface (5) has a back angle (g) of 40 to 60 angular degrees exhibit.

6. clothing wire (1) according to any one of the preceding claims, characterized in that the total height of the wire (hi) is 0.5 mm to 1.5 mm.

7. clothing wire (1) according to claim 6, characterized in that a radius (13) of 0.05 mm to 0.5 mm is formed in a transition from the tooth base surface (7) to the tooth face surface (4).

8. clothing wire (1) according to one of claims 1 to 5, characterized in that the total height of the wire (hi) is 2.0 mm to 5.0 mm.

9. clothing wire (1) according to claim 8, characterized in that a radius (13) of 0.5 mm to 2.0 mm is formed in a transition from the tooth base surface (7) to the tooth face surface (4).

10. clothing wire (1) according to any one of the preceding claims, characterized in that a radius (13) of 0.05 mm to 0.5 mm is formed in a transition from the tooth base surface (7) to the tooth face surface (4).

11. A roller of a textile machine, characterized in that a clothing wire (1) according to one of claims 1 to 10 is drawn onto the roller.