EP2816145A1 - Card clothing - Google Patents

Abstract

The invention relates to a clothing (1) for mounting on a roller (2) for processing fiber materials, comprising at least one profiled wire strip (4) with a base (6) having a top (8) and a bottom (10), and a plurality of teeth (12) arranged in the longitudinal direction of the profiled wire strip (4) and projecting upwards from the upper side (8) of the base (6), wherein in the base (6) a plurality of recesses (14) are formed which extend from extend the bottom (10) to the top (8) of the base (6) and thus allow air to pass from the bottom (10) to the top (8) of the base (6).

Description

The present invention relates to a clothing for mounting on a roller and a roller having such a clothing.

For the web formation of fiber material, both mechanical methods are known, for example by means of carding and fleece laying, as well as aerodynamic processes in which fleeces are formed with the aid of air streams of fibers. In the context of mechanical web formation, in particular in carding, rolls of various types are generally used for further transport and for processing the fiber material, e.g. as worker rolls, turning rolls, compression rolls, random rolls, take-off rolls, take-off rolls, rough rolls or main rolls.

In order to keep the fiber material against the centrifugal forces of the roll on the roll surface, the rolls are usually provided with a so-called set. This is usually formed in the form of an "endless" profile wire strip having a plurality of teeth. As a result, a toothed surface of the roller is obtained, which can meet various requirements depending on the application.

The profile wire strip is usually supplied as a spool and wound around the outer peripheral surface of the roller. When mounting the clothing on the roller, a first end of the profiled wire strip is first soldered to the roller or otherwise secured. Then, turn after turn is wound around the roller under tension and each pressed tightly together until the entire roll is "garnished". Thereafter, the profile wire strip is cut off and the second end is attached to the roller again. The teeth of the wound profile wire strip now protrude from the outer peripheral surface of the roller and can engage in operation during operation in the fiber material for holding or editing.

In the transfer of fiber material from one roll to the other, there is sometimes a problem that the fiber material can not disengage to the desired extent from the teeth of the profiled wire strip of the first roll and thus more fiber material gets stuck on the first roll than desired. An impairment of the web formation process is then the result. It may also happen that the holding force of the teeth certain processes is not sufficient and thus the fiber material is delivered too early or in too large an amount.

The invention is therefore based on the object to provide a set for a roller, with which the adhesion of fiber material to the roller is better controlled.

This object is solved by the features of claim 1.

According to the invention, a set for mounting on a roller is proposed, consisting of a profile wire strip having a base and a plurality of teeth arranged in the longitudinal direction of the profile wire strip, which project upwardly from an upper side of the base. In this case, a plurality of recesses are formed in the base, which extend from an underside of the base to the top of the base.

If the clothing according to the invention is mounted on a roller provided with openings in such a way that at least a part of the passage openings is aligned with at least a part of the recesses, an air passage from the interior of the roller to the outside and vice versa can take place. Thus, on the one hand, when the usually hollow roll cylinder is pressurized with compressed air, the fiber material can be effectively blown off the roll so that no or only a small amount of fiber material remains adhering to the teeth. On the other hand, by generating a negative pressure in the roll cylinder, the through holes of the roll aligned with the recesses may act as suction nozzles, thereby enhancing the holding property of the clothing.

When mounting the clothing of the profile wire strip is preferably wound spirally on the cylinder with a very small pitch so that between the individual turns of the wound profile wire strip, with the exception of the recesses, no gap is present. This results in a random arrangement or a statistical distribution of the teeth around the roller, which in turn has the consequence that the coincidence or the alignment of through holes of the roller with the recesses of the profiled wire strip is randomly or statistically distributed. It has been found that the random arrangements always provide the number of matches sufficient for effective wicking and / or blowing action. Accordingly, the mounting can without special attention to the conformity of through holes and recesses.

Furthermore, it is preferred if the recesses are formed on a lateral edge section of the base of the profiled wire strip, in particular laterally open. When the profile wire strip is wound around the roll so that there is no gap between the individual turns, the side recesses are closed by the side surface of the base of an adjacent profiled wire strip turn. It is also advantageous here that the base can be produced with a smaller width and less effort than with a through opening arranged centrally in the base.

In a further embodiment, the recesses are elongated, so that a larger surface of the fiber material can be acted upon with the suction or blowing force, whereby the effectiveness of the suction and blowing operations is improved.

If each tooth or valley region in the profile wire strip is assigned a recess, an air supply or removal is potentially possible for each individual tooth or valley region, which promotes the repulsion or holding effect. Due to the only statistically distributed agreement of passage opening in the roller and recess of the profiled wire strip is not assigned to each tooth or each valley area an air supply or -abfuhr. Nevertheless, in such an arrangement due to the plurality of recesses, the probability is relatively high that a recess in the profile wire strip is actually aligned with a through hole in the roll cylinder. As a result, the effectiveness and intensity of the suction or blow-out is improved.

In a specific embodiment, the recesses are arranged with respect to the longitudinal direction at the level of the valley areas and in the transverse direction next to the valley areas. Thus, the recesses are very close to the valley areas between the teeth and the valley areas can be particularly effectively acted upon by the suction or blowing force. Furthermore, this can be an effective control of the adhesion of the roller can be implemented. Optionally, a switch between suction and blow-out can be done quickly.

As already mentioned, the invention also relates to a roller for processing fiber materials with a clothing according to the invention.

Preferably, the roll has a hollow roll cylinder having a plurality of through openings in the lateral surface, and the clothing is spirally wound on the roll cylinder such that at least a portion of the recesses in the profile wire strip are aligned with through holes in the roll cylinder.

To generate the suction and / or blown air streams through the recesses, the cavity of the roll cylinder communicates with a compressed air and / or a suction air device in order to generate an overpressure or a negative pressure in the cavity. Preferably, the compressed air and / or Saugluftvorrichtung allows an abrupt switching between intake and blowing operation.

But there are also other embodiments of the roller conceivable, which are described in more detail in the following description of the figures.

Fig. 1A

ist eine Seitenansicht eines Abschnitts eines Profildrahtstreifens gemäß einer ersten Ausführungsform der erfindungsgemäßen Garnitur zum Aufziehen auf eine Walze;

Fig. 1B

ist eine Ansicht im Querschnitt des Profildrahtstreifens aus Fig. 1A;

Fig. 1C

ist eine Ansicht von oben des Profildrahtstreifens aus Fig. 1A;

Fig. 1D

ist eine perspektivische Ansicht des Profildrahtstreifens aus Fig. 1A;

Fig. 2A

ist eine schematische Ansicht im Querschnitt von zwei benachbarten Windungsabschnitten des Profildrahtstreifens aus Fig. 1A im auf eine Walze gewickelten Zustand;

Fig. 2B

ist eine schematische Ansicht von oben der zwei benachbarten Windungsabschnitte des Profildrahtstreifens gemäß Fig. 2A;

Fig. 2C

ist eine schematische Perspektivansicht der zwei benachbarten Windungsabschnitte des Profildrahtstreifens gemäß Fig. 2A, wobei die Krümmung aus Gründen der Übersichtlichkeit weggelassen wurde;

Fig. 3

ist eine perspektivische Ansicht einer Walze mit einem Abschnitt mit aufgezogener Garnitur gemäß Fig. 1A und mit einem Abschnitt ohne Garnitur;

Fig. 4

ist eine Ansicht, die einen Abschnitt der Walze aus Fig. 3 in vergrößerter Darstellung zeigt;

Fig. 5A

ist eine Perspektivansicht eines Abschnitts eines Profildrahtstreifens gemäß einer weiteren Ausführungsform der erfindungsgemäßen Garnitur zum Aufziehen auf eine Walze;

Fig. 5B

ist eine schematische Perspektivansicht von zwei benachbarten Windungsabschnitten des Profildrahtstreifens aus Fig. 5A im auf eine Walze gewickelten Zustand, wobei die Krümmung aus Gründen der Übersichtlichkeit weggelassen wurde;

Fig. 6A

ist eine Perspektivansicht eines Abschnitts eines Profildrahtstreifens gemäß einer weiteren Ausführungsform der erfindungsgemäßen Garnitur zum Aufziehen auf eine Walze;

Fig. 6B

ist eine schematische Perspektivansicht von zwei benachbarten Windungsabschnitten des Profildrahtstreifens aus Fig. 6A im auf eine Walze gewickelten Zustand, wobei die Krümmung aus Gründen der Übersichtlichkeit weggelassen wurde.

Further features and advantages of the present invention will become apparent from the following description with reference to the drawings.

Fig. 1A

is a side view of a portion of a profiled wire strip according to a first embodiment of the invention for mounting on a roller;

Fig. 1B

is a view in the cross section of the profile wire strip Fig. 1A ;

Fig. 1C

is a top view of the profile wire strip Fig. 1A ;

Fig. 1D

is a perspective view of the profile wire strip Fig. 1A ;

Fig. 2A

is a schematic view in cross section of two adjacent Windungsabschnitten of the profiled wire strip Fig. 1A in the state wound on a roll;

Fig. 2B

FIG. 12 is a schematic top view of the two adjacent turn portions of the profile wire strip according to FIG Fig. 2A ;

Fig. 2C

FIG. 12 is a schematic perspective view of the two adjacent turn portions of the profile wire strip according to FIG Fig. 2A where the curvature has been omitted for clarity;

Fig. 3

FIG. 12 is a perspective view of a roller having a garnished portion according to FIG Fig. 1A and with a section without clothing;

Fig. 4

is a view that makes up a section of the roller Fig. 3 in an enlarged view;

Fig. 5A

is a perspective view of a portion of a profiled wire strip according to another embodiment of the invention for mounting on a roller;

Fig. 5B

FIG. 12 is a schematic perspective view of two adjacent turn portions of the profile wire strip. FIG Fig. 5A when wound on a roll, with the curvature omitted for clarity;

Fig. 6A

is a perspective view of a portion of a profiled wire strip according to another embodiment of the invention for mounting on a roller;

Fig. 6B

FIG. 12 is a schematic perspective view of two adjacent turn portions of the profile wire strip. FIG Fig. 6A in the wound on a roll state, the curvature has been omitted for clarity.

Fig. 1A-1D each show a portion of a profiled wire strip 4, as used in a first embodiment to form the clothing according to the invention 1.

In Fig. 1A a portion of the profiled wire strip 4 is shown in side view. The profiled wire strip 4 consists of a base 6 (or foot) and a plurality of arranged in the longitudinal direction of the profiled wire strip 4 teeth 12 (or tips), which protrude from the base 6 upwards. Overall, in the Fig. 1A five teeth 12 are shown, which form a sawtooth-shaped arrangement. In reality, the profiled wire strip 4 is present as an "endless" strip.

As in Fig. 1A can be seen, the teeth 12 are formed uniformly and each have a flat edge 11 and a steep, in particular vertical edge 13. The flanks 11, 13 run towards a tooth tip 15. Between the teeth 12 each valley regions 18 are formed, which connect a flat edge 11 of a tooth 12 with the steep edge 13 of the next tooth 12. The valley areas 18 have a rounded contour. Likewise, all other forms of teeth 12 and valley regions 18 known from the prior art can be used within the scope of the invention.

Fig. 1B is a view of the profile wire strip 4 from Fig. 1A from the right and in cross-section. It can be seen that the profile wire strip 4 is formed at least in sections (in the region of the teeth 12) is substantially L-shaped, wherein the teeth 12 form the vertical, longer leg 9 of the L-profile and the base 6 the shorter, horizontal leg 7 of the L-profile forms. The base 6 has an upper side 8, from which the teeth 12 protrude upwards, and a lower side 10, which serves as a contact surface for abutment against the outer circumferential surface of the roll cylinder 3 (see FIG Fig. 3 and 4 ) serves up.

In the top view of Fig. 1C the flat flanks 11 of the teeth 12 and the valley regions 18 located between the teeth 12 can be seen. In the lateral edge regions of the base 6, ie in the figure below, a plurality of, here five, elongate recesses 14 are formed. The recesses 14 are to the side (in Fig. 1C down) open and at regular intervals from one another in the longitudinal direction of the profiled wire strip 4. Furthermore, the recesses 14 extend in the direction transverse to the longitudinal extension of the profiled wire strip 4 only over a portion which corresponds approximately to half of the extension of the base 6 from the lateral edge to the teeth 12. The recesses 14 are arranged offset to an associated tooth 12 such that they are each arranged in a region of the base 6 of the profiled wire strip 4, which is located in Transverse direction next to a tooth tip 15 is located. Likewise, the recesses 14 may be arranged laterally next to the valley regions 18.

In the perspective view in Fig. 1D It can be seen that the profiled wire strip 4 is formed from an L-profile, wherein in the longer profile leg 9, the teeth 12 are formed, and in the shorter profile leg 7, the recesses 4 are formed.

Fig. 2A-2C each show schematic views of two adjacent Windungsabschnitten the profile wire strip Fig. 1A when wound on a roll state, the curvature of the profile wire strip and also the oblique inclination have been omitted for clarity.

Fig. 2A is a right-hand and cross-sectional view showing that two profiled wire windings 24 of a profiled wire strip 4 are juxtaposed and their bases 6 abut each other. The contact of the two profiled wire windings 24 takes place along the longitudinal side surfaces, wherein the in Fig. 2B left profiled wire winding 24 with the side surface 26, which lies in the region of the recesses, on the adjacent side surface 28 of the other profiled wire 24 which lies in the region of the teeth 12, is applied.

In the top view of Fig. 2B the flat flanks 11 of the teeth 12 and the valley regions 18 located between the teeth 12 can be seen. In the lateral edge regions of the second, in the figure lower profiled wire 24 in turn a plurality of elongated recesses 14 are formed. Furthermore, a plurality of elongated recesses 14 are also formed in the edge regions of the first, in the figure upper profiled wire 24. The recesses 14 of the upper profile wire winding 24 and the recesses 14 of the lower profiled wire 24 are in the illustrated schematic example in the transverse direction side by side. In reality, due to the winding process, a shift in the position of the recesses 14 in adjacent profiled wire windings 24 will occur.

In Fig. 3 and 4 is a perspective view of a roller 2 shown, the roll cylinder 3 with the set of 1 from Fig. 1A Is provided. At the two ends of the roll cylinder 3 are hub sections 30 (FIG. Fig. 3 ) are provided for the purpose of rotatable mounting of the roll cylinder 3, which have a smaller diameter than the roll cylinder 3. The Both ends of the roll cylinder 3 are each closed by a roll cylinder cover 32.

The elongated roll cylinder 3 is hollow on the inside and has a lateral surface in which a multiplicity of openings 5, in this case passage openings or holes, are formed. The openings 5 establish an air passage connection between the external environment and the interior of the roll cylinder 3. The openings 5 are arranged in the illustrated example in the longitudinal extent of the roller 2 in rows and from each other evenly spaced, whereby at the same time a plurality of rows of through holes 5 extend at equal intervals in the circumferential direction of the roll cylinder 3.

For the purpose of illustration only, a first portion of the roll cylinder 3 (in the figures on the left) is shown without the clothing, while a second portion (in the figures on the right) with the clothing 1 is shown. When fully assembled, the clothing 1 is also present in the first section.

In Fig. 3 and in particular in the enlarged view in FIG Fig. 4 It can be seen that each opening 5 in the roll cylinder 3 is arranged in alignment or in alignment with a recess 14 in the clothing 1. This is of course not possible in reality, because when mounting the clothing 1 on the roll cylinder 3 with very low pitch results in a random arrangement or a statistical distribution of the teeth 12 and the recesses 14 to the roll cylinder 3. This has the consequence that the coincidence or alignment of openings 5 of the roller with the recesses 14 of the profiled wire strip is randomly or statistically distributed. As a rule, such a random arrangement provides a sufficient number of matches for an effective suction and / or blowing action. Accordingly, the mounting of the clothing 1 on the roll cylinder 3 without special attention to the coincidence of openings 5 and recesses 14 take place. The probability of correspondence can be increased by making the openings 5 and the recesses 14 as large as possible.

In operation, an overpressure or negative pressure is optionally generated in the interior of the roll cylinder 3. If the interior of the roll cylinder 3 is subjected to overpressure, passes through each aligned with a recess 14 opening 5, an air flow, which passes through the recess 14 past the adjacent valley area 18 or the adjacent tooth tip 15. This makes it possible, fiber material that is held by the teeth 12 of the clothing 1 or has accumulated in the valley areas 18 to blow off all over.

On the other hand, if negative pressure is applied to the interior of the roll cylinder 3, air is drawn in from outside the roll cylinder 3 via the openings 5 and the recesses 14 aligned therewith. If there is fiber material on the roll 2, this can be used to reinforce the adhesion to the roll cylinder 3.

The recesses 14 may also have a different shape than the elongated shape. For all embodiments, the recesses 14 may be formed, for example, triangular, semi-oval or semicircular. Examples of such modifications are in Figs. 5A and 5B and 6A and 6B. In addition, the recesses 14 may be formed as completely enclosed by the base 6 passages.

In principle, the arrangement and shape of the openings 5 in the roll cylinder 3 and the recesses 14 in the clothing 1 can be variably selected by the person skilled in the art.

The winding of the clothing 1 on the roll cylinder 3 is preferably carried out spirally with a very small pitch (ie almost annular) such that between the individual profiled wire windings 24 of the wound profile wire strip 4, with the exception of the recesses 14, no gap is present, so the one side surface of the first profiled wire 24 is applied to the other side surface of the second profiled wire 24 (see Fig. 2A and 4 ).

But there are also other configurations conceivable. For example, initially single sets of rings can be produced, which are threaded onto the roll cylinder 3.

The roll cylinder 3 can also be provided with grooves or channels of arbitrary shapes and directions, so that all or at least some openings 5 (in this case better known as holes) are fluidically interconnected and thus Also an extraction or injection from the roll edge is possible. In this case, the roller 2 need not necessarily be formed as a hollow roller.

The roller 2 can also be acted upon in sections with varying degrees of blowing air, and it may also be useful to subdivide sectoral individual roller sections.

So far, a roll cylinder 3 was always provided in the embodiments, on which the clothing 1 is wound. As a variant, it is also conceivable first to wind the clothing 1 onto a roll cylinder and to glue or solder the individual profile wire windings 24 together. Subsequently, the roll cylinder, which acted as a Aufwickelhilfe, are removed and there is a roller 2, which consists exclusively of the clothing 1. Such a roller 2 has a very high air permeability.

Claims (13)

Set (1) for mounting on a roller (2) for processing fiber materials, comprising
a profiled wire strip (4) having a base (6) having a top side (8) and a bottom side (10) and a plurality of teeth (12) arranged in the longitudinal direction of the profiled wire strip (4) and extending from the upper side (8) the base (6) project upwards,
characterized in that
in the base (6) a plurality of recesses (14) are formed extending from the bottom (10) to the top (8) of the base (6) and thus an air passage from the bottom (10) to the top (8) of the base (6). Set (1) according to claim 1, characterized in that the recesses (14) in a lateral edge portion of the base (6) of the profiled wire strip (4) are formed. Set (1) according to claim 2, characterized in that the recesses (14) are open at the side. Set (1) according to one of the preceding claims, characterized in that the recesses (14) are elongated. Set (1) according to one of the preceding claims, characterized in that each tooth (12) is associated with a recess (14), wherein the teeth (12) each have a vertex portion (16) and the recesses (14) with respect to the longitudinal direction Height of the apex portions (16) and in the transverse direction next to the apex portions (16) of the teeth (12) are arranged. Set (1) according to one of the preceding claims, characterized in that the profiled wire strip (4) has a plurality of valley regions (18), each between adjacent teeth (12) of the profiled wire strip (4) are arranged, wherein each valley region (18) is associated with a recess (14) and the recesses (14) with respect to the longitudinal direction at the level of the valley areas (18) and in the transverse direction next to the valley areas (18 ) are arranged. Roller (2) for processing fiber materials, which has a clothing (1) according to one of claims 1 to 6. Roller (2) according to claim 7, characterized in that the roller (2) has a roll cylinder (3) and the clothing (1) is mounted on the roll cylinder (3). Roller (2) according to claim 8, characterized in that a plurality of the recesses (14) in the profile wire strip (4) are aligned with openings (5) for blowing or sucking air in the roll cylinder (3). Roller (2) according to claim 9, characterized in that the clothing (1) is wound as a long strand spirally with a slight pitch on the roll cylinder (3). Roller (2) according to claim 10, characterized in that the clothing (1) is wound on the roll cylinder (3) in such a spiral manner that the base (6) of one turn of the profiled wire strip (4) on the base (6) of the adjacent turn of the profiled wire strip (4). Roller (2) according to one of claims 7 to 11, characterized in that the roll cylinder (3) is hollow and the openings (5) are passage openings in the cylindrical surface of the roll cylinder (3). Roller (2) according to claim 12, characterized in that the cavity of the roll cylinder (3) with a compressed air and / or a suction air device is in communication to generate in the cavity an overpressure or a negative pressure.

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