DE102005040249A1 - Saw-tooth wire for producing all-steel saw-tooth fittings for processing textile fibers, especially for producing a doffing cylinder for a carding machine, has multiple consecutive teeth - Google Patents

Abstract

A saw-tooth wire (10) with a 4-mm overall height (H) has a root section (12) and a blade section (14), in which teeth (20) are punched one after the other in a wire's lengthwise direction. Each tooth has a cutting-tooth face (22) and a tooth's back (24). Clearance between consecutive teeth amounts to 1.96 mm. Teeth cutting depth (h) amounts to 2.2 mm. Independent claims are also included for the following: (1) A method for producing a saw-tooth wire; (2) A doffing cylinder with fittings; (3) A carding machine with a doffing cylinder; (4) A method for producing a card sliver/fiber band by means carding.

Description

The The present invention relates to a sawtooth wire for manufacturing a sawtooth all-steel set for the Processing of textile fibers, in particular for producing a textile fiber Sawtooth all-steel clothing for the Customer of a card. The wire has a plurality of longitudinally of the wire successively arranged teeth, each of which a starting from a tooth base in the direction of a tooth tip extending tooth face and one starting from the tooth tip has in the direction of the following tooth base extending tooth back.

The carding

On There are various cleaning and / or carding zones on the card. The fiber template is fed on the card in the form of a cotton wool. First The cotton wool is pre-cleaned by the licker-in (formerly known as briseur). This consists of 1 to 3 rollers with relatively coarse sets, which further dissolve the flakes and pass it on to the drum. From the drum, the fibers are through the customer in the form of a non-woven and taken to the card outlet passed on to form a sliver. The operation of the Customer is well known to the skilled person and is for example in the manual textile manufacturing "Die Short Staple "Band 2: Blowroom and Karderie (Author: W. Klein, Editor: The Textile Institutes), page 50 summarized and presented.

The fleece removal

Also In cards of relatively conventional construction, it is known that Problems associated with the garnish of the customer may arise. According to EP-A-1136599 it has been shown that the nonwoven fabric removed by the customer in particular at higher Production weights early on detached from the customer, which can lead to problems in the further processing of the fiber material. To remedy such problems has already been proposed, the Saw teeth the Sawtooth Card Clothing to provide the customer with lateral grooves Einwalzungen.

According to information in EP-A-1136599, however, it has been found that in particular in High performance cards with production capacities of 80 kg or more at the thus achieved high peripheral speed of the customer despite the holding force promoting Grooving in the tooth flanks early detachment of the Faservlieses occurs by the customer. Therefore, EP-A-1136599 proposes another solution for this Problem before. According to this solution have the backs of the teeth specially formed sections on which the set of The fleece should increase the generated holding power. The EP font beats but no other changes in the tooth geometry. The tooth enhancements described in EP-A-1136599 can be discussed also be used in combination with the present invention - but they solve the problems outlined below are not always true.

In the latest generation of high-performance karten, for example the C60 card from Rieter, is the working width of the drum from the usual value increased in the range 1 m to 1.5 m Service. additionally is the diameter of the drum from the usual 1.3 m to about 0.84 m reduced. A card with a reduced drum diameter is preferably operated at a relatively high speed to a higher To achieve centrifugal force. The card can be changed by the geometry and the changed accordingly Processing parameters today handle more than 180 kg / h of cotton. Cards of this kind should continue, at least for certain Spinning, for example, in Asia, relatively fine slivers (for example with band numbers in the range 4 to 6 ktex). from that results in a relatively high discharge speed, which is relatively high speeds of all rollers in the acceptance and discharge areas brings with it.

These amended working conditions directly affect the fiber density on the surface of the pickup (on the "occupancy" of the customer). The fleece in the clothing of the customer becomes relatively thin (loose). There are therefore increasingly problems of early replacement of the Non-woven fabric, in particular at the bottom of the customer. at the even higher Rolling speeds, which today also with cards with a working width of about 1 m for discussion, the problems are out the low web density on the customer arise, even in such Machines occur.

in view of These problems in the prior art is the present invention the task is based on a sawtooth wire To provide the production of a sawtooth all-steel set for the customer a card allows with the early one solution the fiber fleece reliably avoided can be.

According to the present Invention is the solution This object is achieved by the features of claims 1, 12, 13, 14 and 16.

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

Based The figures and examples are also further features of the invention explained.

1 a schematic side view of a sawtooth wire similar to the prior art in the 1a EP-A-1 136 599;

2 schematic side view of a card;

3 a copy of 1 with changes according to the present invention;

4 a copy of 1 with further changes according to the present invention.

2 schematically shows 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 the invention may apply 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 effective through the axial length of the garnished surface on the drum 1 certainly.

In operation, fiber flakes are transported through pneumatic transport channels through the various cleaning process steps (not shown) and finally in the hopper 16 the card is formed into a cotton wool. The shaft 16 in 2 is as a so-called "cleaner shaft" with a cleaning module 15 executed between the shaft top and the manhole base. However, this is not essential for the present invention, instead of a cleaner shaft and a normal hopper can be provided. The shaft then passes the fibers as wadding to the card, to a known feed device (not specifically designated), which feeds the batting at a predetermined speed into the card.

The feeder feeds the fibers to a licker-in module 3 , The module 3 in the 2 includes several licker-in rollers, but it can also be provided only a single licker-in. In the licker-in module, the fiber flakes are opened further and some of the dirt particles are removed. The (last) licker-in roller transfers the fibers to the card drum 1 , The card drum works in the so-called main carding area 8th (Angle range Σ) with the covers 7 together and opens and cleans the fibers even further. The lids are supported by belts, which by deflection or drive rollers 6 are guided. The lids 7 be through a lid cleaning 14 cleaned and eventually sanded with a grinder.

The drum 1 can be divided into four zones:
In the main carding area 8th Normally, the drum works as shown with a revolving flatbed 2 although arrangements with so-called hard covers are also known.

The Pre-carding zone lies between the licker-in and the main carding zone, while the post-carding zone between the main carding zone and the customer is provided. In the Vorkardier- and Nachkardierzonen are mostly Arrangements of stationary Cleaning elements provided, such as hard covers with trimmings, Knives and suction elements.

Between the customer and the licker-in is the sub-carding zone, which is designed differently depending on the make.

After the fibers have partly carried out several cycles on the card drum, they are made by the customer 4 detached from the card drum in the form of a loose web, the discharge area 5 fed and finally deposited as a card sliver by means of a Kannenstokkes in a pot (not shown). As described by Klein in the aforementioned manual, the customer must 4 be provided with a special set to fulfill its task. The standard designs of this set today use a chest angle ∀ in the range 20 ° to 30 ° (see Klein, manual as mentioned above, page 54, and garnish table on page 55, but see also EP-A-1136599, column 5, lines 1 to 3). The direction of rotation of the customer is in the 2 indicated 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 schematically.

As mentioned in the introduction, the pickup may under-apply too low a holding force to the low-coherence non-woven fabric. The fleece then tends to stick to the bottom of the pickup 4 as shown schematically in the 2 indicated by the arrow P to detach 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 Abhil fe in a redevelopment of the pickup set, or a sawtooth wire for this, as described below with reference to 3 and 4 is described. For the time being but closer to the state of the art on the basis of 1 received.

The in 1 illustrated sawtooth wire 10 according to the prior art (EP-A-1136599) comprises a foot section 12 and a leaf section 14 , The total height H of this sawtooth wire is 4 mm. In the leaf section 14 are a number of teeth arranged one behind the other in the longitudinal direction of the wire 20 punched. Each of these teeth 20 has a starting from a tooth base 21 up to a tooth tip 26 extending tooth face 22 as well as starting from the tooth tip 26 until the next tooth base 21 extending tooth backs 24 on. 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 shown in the drawing 10 the chest angle is α 30 ° and the back angle β is 48 °.

The Terminology used in this description corresponds the draft ISO standard no. 5234, which will be put to the vote at the end of 2004 with the exception of the use of the common name of the "breast angle" (α), which in the abovementioned standard is referred to as "working angle".

versions a sawtooth wire 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 nonwoven fabric on the underside of the pickup. However, the holding force must not be increased so far that the clothing is no longer able to clean the fleece to the card outlet 5 leave.

A sawtooth wire which enables a first approach is schematically shown in FIG 3 shown. In this embodiment, the angle θ of the prior art has been increased to ζ. The back angle Ǝ has been kept unchanged, however, so that the wedge angle, which is enclosed by the tooth flanks, becomes smaller. 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.

Of the Chest angle ζ can now between 32 ° and 45 ° can be chosen with a breast angle ζ between 34 ° and 37 °, for example 35 ° is preferred. A breast angle ζ between 38 ° and 42 °, in particular between 39 ° and 41 ° and for example 40 ° but under certain circumstances (depending on the fiber assortment or the operating parameters of the card) prove necessary, to the problems of the early Vliesablösens to get a grip on.

The other tooth parameters are in the 3 in comparison with the prior art according to the 1 remained unchanged, possibly with the exception of the tooth pitch, which is indicated by the reference numeral d1, can be adjusted. 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 the 4 are in turn the changed parameters ζ and d1 according to the 3 indicated and they also apply to this second embodiment. In this case, however, in particular the tooth incision depth h ( 1 and 3 ) - as in the 4 with dashed lines on the "deeper" tooth base 21A is indicated. The incision depth is therefore in the 4 denoted by the new reference numeral h1. The total height H ( 1 and 3 ) is in the embodiment according to the 4 has been adapted and is therefore re-designated by the reference H1.

The total height H1 of the tooth in a sawtooth wire according to of the present invention less than 5.5 mm, and preferably less than 5.2 mm, for example in the range 4.7 mm to 5 mm. The total height H1 may however (depending on the supplier) be appropriate between 3.5 and 4.3 mm are and is then preferably between 3.8 and 4.1 mm, for example at 4 mm.

The Tooth 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.

Of the back angle a sawtooth wire according to this Invention can be between 30 ° and 50 ° can be selected and is preferably in the range 34 ° to 40 °. A wire according to this Invention can be mounted on a roller to a pickup with a peak density in the range of 250 to 400 ppsi (points per square inch). The preferred peak density is in the range 280 to 340 ppsi.

Claims (20)

A sawtooth wire for producing a sawtooth all-steel clothing for the processing of textile fibers, in particular for producing a sawtooth all-steel set for the customer of a card, having a plurality of teeth arranged one behind the other in the longitudinal direction of the wire, each of which starting from a tooth base in the direction of a tooth tip extending tooth face and a starting from the tooth tip in the direction of the following tooth base extending tooth back, characterized in that the breast angle ζ is between 32 ° and 45 °. sawtooth according to Claim 1, characterized in that the breast angle ζ is between 34 ° and 42 °. sawtooth according to Claim 2, characterized in that the breast angle ζ is between 34 ° and 37 °. sawtooth according to Claim 3, characterized in that the breast angle ζ is between 38 ° and 41 °. sawtooth according to one of the preceding claims, characterized in that the total height of the tooth is less than 5.5 mm. sawtooth according to Claim 5, characterized in that the total height of the tooth less than 5.2 mm. sawtooth according to Claim 6, characterized in that the total height of the tooth between 3.5 and 4.2 mm. sawtooth according to Claim 7, characterized in that the total height of the tooth between 3.8 and 4.1 mm. sawtooth according to one of the preceding claims, characterized in that the tooth incision depth is less than 2.4 mm. sawtooth according to Claim 9, characterized in that the tooth recess depth between 2.0 and 2.3 mm. sawtooth according to Claim 10, characterized in that the tooth incision depth between 2.1 and 2.25 mm. Method for producing a sawtooth wire according to one of the claims 1 to 11, in which a raw material to a leaf portion having Wire is formed, and then saw teeth punched in the blade section be, characterized in that the breast angle ζ of the fitting teeth between 32 ° and 45 °, especially either between 34 ° and 37 ° or between 38 ° and 42 °. Customer with a clothing, characterized that the set of sawtooth wire according to a of the preceding claims is formed. Customer according to Claim 13, characterized in that the clothing a peak density between 250 and 400 ppsi. Card with a customer according to claim 13 or claim 14th Card according to Claim 15 with a working width greater than 1.3 m, in particular in the range 1.5 to 2 m. A method for producing a sliver by carding processing followed by banding in card runout, characterized in that the card according to claim 15 or 16 is formed. Process according to Claim 17, characterized in that the sliver a volume number between 4 and 6 ktex. Process according to Claim 17 or 18, characterized in that the sliver delivered with a discharge speed of more than 350 m / min becomes. Process according to one of the claims 17 to 19, characterized in that the sliver with a Production bigger than 100 kg / h, in particular larger delivered as 130kg / h.