DE102006030155B3 - Drawframe belt for a spinning machine has two surfaces with different properties designed to provide a compromise between good adhesion or sliding properties on one side and good fiber transport on the other side - Google Patents

Abstract

Drawframe belt has two surfaces with different properties designed to provide a compromise between good adhesion or sliding properties on metal guide surfaces on one side and good fiber transport on the other side, so that the belt can be used with one or other side facing outwards depending on the particular fiber material being processed.

Description

Subject of the invention

The The invention relates to a delay apron for fiber drafting systems with different Features on both sides.

State of the art

Strapping straps in drafting systems are subject to very different requirements:
On the one hand, they should be easy to slide on surfaces over which they are pulled, such as clamps or Riemchenkäfige, and have low wear, on the other hand they should have good guidance of the fibers, so they hold back well, but not stick to them, do not charge them electrostatically and other more.

Around to meet these different requirements, the two sides the straps frequently executed differently, this means made of different materials or with different ones surface fitted.

After EP 1 350 871 A2 the outer layer of a strap, which comes into contact with the fibers, should be substantially rougher than the inner layer, slidingly guided by a guide means.

DE 39 22 507 A1 discloses a strap with a smooth (inner) reinforcing layer and a more adherent elastomer (outer) layer. The shrink film of the inner layer can be made of polyamide or polyester, the elastomer layer of natural or synthetic rubber or thermoplastic elastomer.

EP 010 443 B1 claims a 0.264 micron (10 micro inch) groove on the outside.

The DE 100 29 301 A1 provides different areas, which are assigned to the drive roller, the sliding surface or the fiber structure. In this case, the drive roller and the area associated with the fiber structure on the outside of the strap [A3], according to another proposal of the drive roller and the sliding surface associated area on the inside of the strap [A4] should be arranged. A region assigned to the drive roller can be an edge region of the belt [A5] and have a coarse structuring [A6]. The area assigned to the fiber structure should have a fine structure [A8] or be unstructured [A9]. In this case, a corrugation always runs only over a portion of the width of the strap, in particular over its edge region.

The DE 1 132 839 A proposes to turn off the inside of a strap on the surface shape of the driving draw roller, so provided with fish skin pattern or with grooves.

So that beats DE 10 2004 037 492 A1 To add to the surface of a transport belt electrostatic charges reducing materials.

If requires other fiber guiding properties a different strap is required. The replacement of Strappy requires considerable time. One possible versatile application from Riemchen would be therefore a big advantage.

Task of invention

Of the Invention was therefore the task of proposing a strap, by at least two different applications in the Stretching of fiber materials can be covered satisfactorily. she solve these Task by the features mentioned in the characterizing part of the main claim.

general description

Thereby, that both sides of the strap on each a practicable compromise between good adhesive or sliding property on in particular metallic Guide surfaces on the one hand as well as good leadership On the other hand, the strapping may vary depending on Requirement of each processed fiber material with the one or the other side to the outside turned used with advantage.

The different properties of the two sides of the strap can through different physical Structure and / or be achieved by different materials. Both features have an influence on the management, especially on the restraint the fibers in the delay as well as on the sliding property of the strap fixed or moving surfaces as it is driving rollers or leading or / and exciting temples.

The bodily surface structure of a strap is determined by elevations and / or depressions that may be irregular or random or systematically arranged or dimensioned. Irregular, random arrangement can be understood as greater or lesser roughness. As a systematic arrangement is usually to see corrugation, which can be oriented differently. For Verzugsriemchen especially corrugation transverse to the direction in question, but in many cases can also V-shaped corrugation or reefs ment in the direction of advantage.

there extends the V-shape with the tip in the direction of travel and the middle of the strap. The V-ribs lead Fibers when pulled out by the delay under two cooperating Straps against the middle of the default field and cause a certain Summary of the tendency to diverge under warping Running fiber bandage.

On The inside of a strap promises ribbing in the direction of travel low friction on stationary surfaces. Cross ribbing improved on the other hand, especially the entrainment of a strap by ribbed or knurled rolls.

different Frictional properties are mainly due to the material-specific coefficient of friction of the material of a strap. It requires the gliding a strapping over fixed surfaces like clamps, Turning rails, cage edges low coefficient of friction, whereas the entrainment by promoting surfaces like drive rollers with higher Coefficient of friction occurs.

Next low coefficient of friction but also comes high abrasion resistance on stationary surfaces considerable importance.

For drafting system straps In addition to natural rubber also synthetic rubber and flexible Materials such as polyamides, polyesters, polyurethanes, polytetrafluoroethylene and others introduced and proven.

It It is understood that the different properties of a strap by intelligent combination of a suitable appearing physical Structure with different materials can be further optimized can. For example, for the Entrainment by a drive roller (too) low coefficient of friction transverse corrugation can be improved. On the other hand, one can for the backing of Fibers (too) high physical Structure reduced by a material with a low coefficient of friction become.

different Adhesive or sliding properties can achieved by different materials of the effective surfaces become. For this purpose, for example, on a strap with continuous uniform material on one side a very thin layer a material with other adhesive / sliding properties are sprayed on.

It will not be possible be with the only two sides of a strap all claims to his different applications cover. Because these claims in a spinning mill should not be too different, the Covering two requirements with only one strap represent an advantage.

Special description the invention

In the figures of the drawings are embodiments of the invention shown schematically. Show it

1 a strap with its two surfaces;

2 . 3 and 4 different types of corrugation in sections.

How out 1 As can be seen, each of the two surfaces 1 and 2 a strappy 3 be made by everting to the inside or outside.

2 shows a section of a strap 3 with a physical structure in the form transverse to the direction of travel 4 lying ribbing 5 , The corrugations may be closer or farther apart, they may be deeper or less deep.

Out 3 is V-shaped ribbing 6 seen. The tip of the V points in the uphill direction 4 and lies in the middle of the strap 3 and thus the stretch field.

4 gives a ribbing 7 in the direction of travel 4 a strapping again. This makes sense if the strap consists of a material with a coefficient of friction that could hinder its sliding on fixed deflection edges. Longitudinal ripples 7 on the inside reduce the contact surface of the strap at the Umlenkkanten, thus reducing the friction and wear on these.

The coefficient of friction of a strap 3 can be determined by the choice of the material or its several in combination within wide limits. As a rule, a higher coefficient of friction can be reduced by stronger physical structure if better sliding properties on resting surfaces are to be achieved. On the other hand, a high coefficient of friction can be maintained by dispensing with physical structure, if greater retention on fibers in delay is to be achieved.

Greater retention effect on fibers can usually be due to stronger physical structure and / or through higher ones Friction coefficient can be reached or increased.

Ala Material for the straps has proven to be polymeric urethane. Different material can be implemented by using different (poly) Urethanabkömmlinge.

1, 2

surfaces

3

Strappy

4

direction

5

Transverse fluting

6

V-shaped ribbing

7

Riffle

Claims (9)

Warp straps for fiber drafting systems with different properties on both sides, characterized in that the different properties of the apron ( 3 ) on its two sides ( 1 . 2 ) is so aligned to a compromise between good adhesion or sliding property on particular metallic guide surfaces on the one hand and on good management of fibers on the other hand, that the strap depending on the requirement of each processed fiber material with one side or the other turned outwards with advantage can be used. Strapping according to claim 1, characterized in that the different properties of the strap ( 3 ) on its two sides ( 1 . 2 ) are achieved by different physical structure. Strapping according to claim 1, characterized in that the different physical structure by corrugation ( 5 . 6 . 7 ) is achieved. Strapping according to claim 3, characterized in that the corrugation ( 5 ) substantially transversely to the running direction of the belt ( 3 ) runs. Strapping according to claim 3, characterized in that the corrugation ( 6 ) V-shaped to the middle of the circumference and in the direction of the strap ( 3 ) runs. Strapping according to claim 3, characterized in that the corrugation ( 7 ) longitudinally in the direction of the belt ( 3 ) runs. Strapping according to at least one of claims 2 to 6, characterized in that the physical structure ( 7 ) over the entire width of the strap ( 3 ). Strapping according to claim 1, characterized in that the different properties of the strap ( 3 ) on its two sides ( 1 . 2 ) are achieved by different friction properties. Strapping according to claim 8, characterized that the different friction properties by different Materials are achieved.