EP1917387A1

EP1917387A1 - Sawtooth wire

Info

Publication number: EP1917387A1
Application number: EP06775146A
Authority: EP
Inventors: Werner Hirschle; Götz Theodor Gresser
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2005-08-24
Filing date: 2006-08-22
Publication date: 2008-05-07
Also published as: WO2007022659A1

Abstract

Sawtooth wire for production of a sawtooth solid steel fitting for the processing of textile fibres, in particular, for the production of a sawtooth solid steel fitting for the doffer of a carding machine. The breast angle a<SUB>1 </SUB>is between 32° and 45° which is novel.

Description

sawtooth

The present invention relates to a sawtooth wire for producing a sawtooth all-steel clothing for the processing of textile fibers, in particular for producing a sawtooth all-steel clothing for the customer of a card. The wire has a plurality of teeth arranged one behind the other in the longitudinal direction of the wire, each of which has a tooth face extending from a tooth base towards a tooth tip and a tooth back extending from the tooth tip towards the following tooth base.

The carding

There are various cleaning and / or carding zones on the card. The fiber backing is fed to the card in the form of a cotton wool. First, the cotton wool is pre-cleaned by the licker-in (formerly called Briseur). This consists of 1 to 3 rollers with relatively coarse sets, which further dissolve the flakes and pass it to the drum. From the drum, the fibers are removed by the taker in the form of a nonwoven and passed to the card runner to form a sliver. The mode of operation of the customer is well known to the person skilled in the art and is summarized and set forth, for example, in the handbook of textile production "Die Kurzstapelspinnerei" Volume 2: Putzerei und Karderie (author: W. Klein, publisher: The Textile Institute), page 50.

The fleece removal

Even in cards of relatively conventional construction, it is known that problems may arise in connection with the clothing of the customer. According to EP-A-1136599, it has been found that the nonwoven fabric removed by the customer is detached from the customer at an early stage, especially at higher production weights, which can lead to problems in the further processing of the fiber material. To remedy such problems has already been proposed to provide the saw teeth of the sawtooth-Ganzstahlgarnituren the customer with lateral Rilleneinwalzungen.

confirmation Skopje According to EP-A-1136599, however, it has been found that in particular in high-performance carding machines with production rates of 80 kg or more at the high peripheral speed of the pickup which achieves this despite the groove reinforcements in the tooth flanks which promote the holding force, premature detachment of the fiber web from the web Customer occurs. The

EP-A-1136599 therefore proposes another solution to this problem. According to this solution, the backs of the teeth have specially formed sections which should increase the holding force generated by the clothing on the nonwoven fabric. However, the EP document does not suggest any other changes in tooth geometry. The tooth enhancements discussed in EP-A-1136599 can also be used in combination with the present invention - but they do not solve the problems set out below in all cases.

In the latest generation of high-performance carding machines, for example the C60 carding machine from Rieter, the working width of the drum has been increased from the usual value in the range of 1 m to 1.5 m. In addition, the diameter of the drum is reduced from the usual 1.3 m to about 0.814 m. A card with a reduced drum diameter is preferably operated at a relatively high speed to achieve a higher centrifugal force. Due to the changed geometry and the correspondingly altered processing parameters, the card can process more than 180 kg / h of cotton today. However, cards of this type should continue to be able to produce relatively fine slivers (for example, with band numbers in the range of 4 to 6 ktex), at least for certain spinning mills, for example in Asia. This results in a relatively high discharge speed, which brings relatively high speeds of all rolls in the acceptance and discharge areas with it.

These changed working conditions have a direct effect on the fiber density on the surface of the pick-up (on the "occupancy" of the pick-up) .The fleece in the clothing of the pick-up becomes relatively thin (loose), thus causing problems of premature detachment of the fiber fleece. In particular, at the bottom of the pickup, the even higher rolling speeds, which are nowadays also for cards with a working width of about 1 m up for discussion, the Problems that arise from the low nonwoven density on the taker also occur in such machines.

In view of these problems in the prior art, the present invention has the object to provide a sawtooth wire, which allows the production of a sawtooth all-steel set for the customer of a card, with the early solution of the nonwoven fabric can be reliably avoided.

According to the present invention, the solution of this object is achieved by the features of the independent claims.

The sawtooth wires intended for processing textile fibers can be produced by forming a starting material into a wire section having a blade section and then punching saw teeth into the blade section.

With reference to the figures and examples, further features of the invention will be explained.

Figure 1 is a schematic side view of a card;

Figure 2 is a schematic side view of a sawtooth wire similar to the prior art in Figure 1a of

EP-A-1 136 599;

Figure 3 is a copy of Figure 2 with changes according to vorliegender

Invention; 4 shows a copy of Figure 2 with further changes according to the present invention.

Figure 1 shows schematically a Wanderdeckelkarde, for example, the Rieter card C60 with a working width greater than 1.3 m, in particular of 1.5 m. The principles of Invention may be up to a working width of about 2 m and they can also be used in cards with a conventional working width of about 1 m. The working width of the machine is effectively determined by the axial length of the garnished surface on the drum 1.

In operation, fiber flakes are transported through pneumatic transport channels through the various cleaning process steps (not shown) and finally formed in the hopper 16 of the card to a cotton wool. The shaft 16 in Figure 1 is designed as a so-called "cleaner shaft" with a cleaning module 15 between the shaft top and the manhole base, but this is not essential to the present invention, instead of a cleaner shaft, a normal hopper may also be provided Fibers then as cotton to the card on, namely to a known feed device (not specifically designated), which feeds the cotton at a predetermined speed in the card.

The feeder feeds the fibers to a licker-in module 3. The module 3 in Fig. 1 comprises a plurality of licker-in rollers, but only a single licker-in can be provided. In licker-in module 3, the fiber flakes are opened further and some of the dirt particles are removed. The (last) Vorreisserwalze passes the fibers to the card drum 1. The card drum works in the so-called Hauptkardierbereich 8 (angle range Σ) with the lids 7 together and opens and cleans the fibers even further. The covers 7 are supported by belts which are guided by deflection or drive rollers 6. The covers 7 are cleaned by a lid cleaning 14 and possibly ground with a grinding device.

The drum 1 can be divided into four zones: in the main carding zone 8, the drum 1 normally cooperates with a traveling lid unit 2, as shown, although arrangements with so-called fixed covers are also known.

The pre-carding zone is located between the licker-in and the main carding zone, while the post-carding zone is provided between the main carding zone and the pick-up is. In the Vorkardier- and Nachkardierzonen mostly arrangements of stationary cleaning elements are provided, such as hard covers with trimmings, knives and suction elements.

Between the pickup 4 and the licker-in is the lower carding zone, which is designed differently depending on the make.

After the fibers have partly carried out several cycles on the card drum 1, they are removed by the pickup 4 from the card drum 1 in the form of a loose web, fed to the outlet area 5 and finally deposited as a card sliver by means of a can-stock in a jug (not shown ). As described by Klein in the aforementioned manual, the pickup 4 must be provided with a special set in order to fulfill its task. The standard versions of this set today use a chest angle α in the range 20 ° to 30 ° (see Klein, manual as mentioned above, page 54, as well

Garnish table on page 55; but see also EP-A-1136599, column 5, lines 1 to 3). The direction of rotation of the pickup 4 is indicated in the figure 1 by the arrow A and the reference numeral Z indicates a "Garniturzahn", which has been drawn exaggerated in this figure to illustrate the arrangement of the tooth flanks against the lateral surface of the roller 4 schematically ,

As mentioned in the introduction, the pickup may under-apply too low a holding force to the low-coherence non-woven fabric. The nonwoven then tends to be at the bottom of the pickup 4, as indicated schematically in the figure 1 with the arrow P, to be detached from the clothing and fall off or hang. This can lead to significant running problems. A partial solution would be to attach a casing to the underside of the pickup. But the causes of the problems are not eliminated.

The present invention therefore seeks relief in a new development of

Pickup, or a sawtooth wire for this, as described below with reference to Figures 3 and 4 will be described. For the time being, but will be discussed in more detail on the prior art with reference to FIG 2.

The sawtooth wire 10 shown in Figure 2 comprises according to the prior art (EP-A-1136599) a foot portion 12 and a blade portion 14. The total height H of this sawtooth wire 10 is 4 mm. In the blade section 14, a number of teeth 20 arranged one behind the other in the longitudinal direction of the wire are punched. Each of these teeth 20 has a tooth face 22 extending from a tooth base 21 to a tooth tip 26 and a tooth back 24 extending from the tooth tip 26 to the next tooth base 21. The distance d between successive teeth is 1.96 mm. The tooth incision depth h is 2.2 mm. The term tooth root used above refers to the location of the deepest tooth incision between successive teeth 20. In the sawtooth wire 10 shown in the drawing, the breast angle α is 30 ° and the back angle β is 48 °.

The terminology used in this specification corresponds to the draft of ISO standard no. 5234, which was submitted for approval at the end of 2004, with the exception of the use of the common name of the "breast angle" α, which is referred to in the aforementioned standard as "working angle " referred to as.

Embodiments of a sawtooth wire 10 or a clothing according to the invention: The solution according to the invention is basically to increase the holding power of the clothing, so that the new clothing is certainly able to hold the web on the underside of the pickup. However, the holding force must not be increased to such an extent that the clothing is no longer able to dispense the fleece cleanly to the carding outlet 5.

A sawtooth wire 10, which allows a first approach, is shown schematically in FIG. In this embodiment, the breast angle α according to the prior art has been increased to αi. The back angle ß has been maintained unchanged, so that the wedge angle, which is enclosed by the tooth flanks smaller becomes. As a result, the risk of tooth damage is increased somewhat, so that a set with such a wire would not be suitable for all fiber assortments. The benefits outweigh, however, for certain important applications.

The breast angle αi can now be selected between 32 ° and 45 °, with a breast angle αi between 34 ° and 37 °, for example 35 °, being preferred. However, a breast angle Q ₁ between 38 ° and 42 °, in particular between 39 ° and 41 ° and, for example, 40 ° may prove necessary (depending on the fiber assortment or on the operating parameters of the card) to overcome the problems of early nonwoven detachment To bring a handle.

The other tooth parameters have remained unchanged in FIG. 3 in comparison with the prior art according to FIG. 2, with the possible exception of the pitch, which is indicated by the reference numeral d1. A tooth pitch in the range 1.9 to 2.2 mm, for example, between 2.1 and 2.2 mm has proved to be useful.

In the embodiment according to FIG. 4, the changed parameters αi and d1 according to FIG. 3 are again indicated in accordance with FIG. 3 and they also apply to this second embodiment. In this case, however, the tooth incision depth h (FIGS. 2 and 3) has been increased, in particular-as indicated by dashed lines on the "underlying" tooth base 21 A. The incision depth is therefore shown in FIG The total height H (Fig. 2 and Fig. 3) has been adapted in the embodiment according to the figure 4 and is therefore again designated by the reference numeral H1.

The total height H1 of the tooth in a sawtooth wire 10 according to the present invention is less than 5.5 mm and preferably less than 5.2 mm, for example in the range 4.7 mm to 5 mm. Under certain circumstances (depending on the supplier), however, the overall height H1 can be selected appropriately between 3.5 and 4.3 mm and is then preferably between 3.8 and 4.1 mm, for example 4 mm. The tooth incision depth h1 in an embodiment according to the invention should be less than 2.4 mm and is preferably between 2.0 and 2.3 mm, in particular between 2.1 and 2.25 mm, for example at 2.16 mm.

The back angle β of a sawtooth wire 10 according to this invention can be chosen between 40 ° and 60 ° and is preferably in the range 50 ° to 56 °. A wire according to this invention may be mounted on a roll to provide a pick-up set having a peak density in the range 250 to 400 ppsi (points per square inch). The preferred peak density is in the range of 280 to 340 ppsi.

Claims

claims

1. sawtooth wire (10) for producing a sawtooth all-steel set for the processing of textile fibers, in particular for producing a sawtooth all-steel set for the customer (4) of a carding machine, with a plurality of in

In the longitudinal direction of the wire (10) successively arranged teeth (20), each of which extending from a tooth base (21) towards a tooth tip (26) extending tooth face (22) and starting from the tooth tip (26) in the direction on the following tooth base (21) extending tooth back (24), characterized in that the breast angle Ci _{1 is} between 32 ° and 45 °.

2. sawtooth wire (10) according to claim 1, characterized in that the breast angle αi is between 34 ° and 42 °.

3. sawtooth wire (10) according to claim 2, characterized in that the breast angle αi is between 34 ° and 37 °.

4. sawtooth wire (10) according to claim 2, characterized in that the breast angle αi is between 38 ° and 42 °.

5. sawtooth wire (10) according to one of the preceding claims, characterized in that the total height (H) of the teeth (20) is less than 5.5 mm.

6. sawtooth wire (10) according to claim 5, characterized in that the total height (H 1) of the teeth (20) is less than 5.2 mm.

7. sawtooth wire (10) according to claim 6, characterized in that the total height (H1) of the teeth (20) is between 3.5 and 4.2 mm.

8. sawtooth wire (10) according to claim 7, characterized in that the total height (H1) of the teeth (20) is between 3.8 and 4.1 mm.

9. sawtooth wire (10) according to one of the preceding claims, characterized in that the tooth recess depth (M) is less than 2.4 mm.

10. sawtooth wire (10) according to claim 9, characterized in that the tooth recessed depth (h1) is between 2.0 and 2.3 mm.

11. sawtooth wire (10) according to claim 10, characterized in that the tooth recessed depth (h1) is between 2.1 and 2.25 mm.

12. sawtooth wire (10) according to one of the preceding claims, characterized in that the back angle ß in the range of 40 ° to 60 °, preferably in the range of 50 ° to 56 °.

A method for producing a sawtooth wire (10) according to any one of claims 1 to 12, wherein a raw material is formed into a wire having a blade portion (14), and then teeth (20) are punched in the blade portion (14) characterized in that the breast angle αi of the teeth (20) is between 32 ° and 45 °, in particular either between 34 ° and 37 ° or between 38 ° and 42 °.

14. taker (4) for a card with a set, characterized in that the set of sawtooth wire (10) is formed according to one of the preceding claims.

15. pickup (4) according to claim 14, characterized in that the clothing has a peak density between 250 and 400 ppsi.

16. Card with a pickup (4) according to claim 14 or claim 15.

17. Card according to claim 16 having a working width greater than 1.3 m, in particular in the range 1.5 to 2 m.

18. A method for producing a sliver by the processing by carding, followed by the band formation in card runout, characterized in that the card is formed according to claim 16 or 17.

19. The method according to claim 18, characterized in that the sliver has a band number between 4 and 6 ktex.

20. The method according to claim 18 or 19, characterized in that the sliver is delivered at a discharge speed greater than 350 m / min.

21. The method according to any one of claims 18 to 20, characterized in that the sliver with a production greater than 100 kg / h, in particular greater than

130kg / h is delivered.