A WINDING DEVICE, USE OF A ROLLER AND CORRESPONDING ROLLER

Description

[0001] Winding devices for paper sheeting are known in various designs, where rollers are in contact with the roll being wound parallel to its axis. The roll of the transportation roller rests on two parallel support rollers operating at the same height and is driven from above by a drive roller. The roll on the backing roller is rotary seated on a shaft which, in turn, is mounted to pivot arms. The roll is in contact with a backing roller. As the diameter of the roll increases, the axis of the roll moves away from the fixed backing roller as the pivot arms move outward. The designs can have different details. But they all have in common, in connection with the invention, that an axis-parallel roller is in contact with the roll being wound, for example, in the form of the mentioned support rollers, backing rollers or driving rollers.

[0002] In many cases, it is important to produce the roll of paper sheet with the smallest possible winding stresses. To do this, besides the application of the smallest possible path tension, it is also necessary to use the smallest possible specific nip pressure. The nip pressure, that is, the contact pressure of the roller against the roll being wound, is also responsible for the tensions in the sheet. If the roller in contact with the roll is practically inelastic, as is the case, for example, for a thick-wall steel roller, then the contact region is relatively narrow and is determined only by the flexibility of the roll itself. The contact force is then distributed onto a small surface, and the resultant specific pressure is large. The resultant stresses in the sheet then lead to a large package hardness that is often undesirable.

[0003] Now we have already mentioned the so-called elastic rollers, that is, rollers with a supporting cylindrical roller element at the outer perimeter; they have a coating made of rubber or another elastomer. When using these rollers as supporting, backing or driven rollers, due to the contact pressure, not only is the roll deformed but also the material of the roller coating. Its shape adapts somewhat to that of the roll. The roll is to a certain extent pressed into the soft surface of the roller. This, then, will increase the contact area in the circumferential direction and reduces the specific contact pressure, which, in itself, is desirable. But at the same time, due to the deformation of the roller coating at the edge of the roll, an axial stress on the paper sheet is created; this is not desirable because it affects the quality of the roll. Rollers with an elastic coating operating directly against the roll, thus, provide no advantages compared to the production of rolls of low hardness.

[0004] Thus, the invention is based on the problem of designing a winding device so that it can produce rolls of lesser hardness, without affecting the other roll properties.

[0005] This problem is solved in the first place by the invention described in patent Claim 1.

[0006] The basic idea here is that the thin-wall rolling mantle is made of metal that is easily deformed in the circumferential direction; that is, it can be easily dented or depressed, and, thus, the desirable increase in the contact area in the circumferential direction and, thus, the reduction in specific contact pressure will be possible. But at the same time, the thin-wall rolling mantle made of metal is barely or not deformable in the axial direction, in contrast to an elastomer or even a rubber mantle, and thus does not affect the roll quality because no axial forces are produced.

[0007] Rollers with an elastic, flexible intermediate layer and thin-wall metallic roller mantle are known. For example, DE-GM 77 23 702 shows a rotation element designed with very small inertial moment about the longitudinal axis. This rotation element is to be used, for instance, as a towed diverter roller to guide sheet-like materials, such as textile sheet, paper sheet, metal foils and similar items. On a rotating shaft (4), a cylindrical region with a low-density filler is provided which is surrounded by a metal mantle with a wall thickness of 0.03 to 0.5 mm forming the perimeter of the operating roller. It can be produce electrochemically or by rolling of metal foils.

[0008] From DE-OS 22 37 949, a roller with a roller element is known that is surrounded by an intermediate layer of filler containing bubble material, for example, foamed rubber materials or elastomers. A metallic roller mantle is located on the intermediate layer. The rollers should be used, for example, for calendering of textile products.

[0009] The invention is also embodied in an application of a roller of the type described, as a supporting, backing or driven roller in winding devices for paper or similar articles.

[0010] In the preferred design of the invention, the intermediate layer consists of a compact, elastomeric material with a Shore A hardness of 30° to 80°.

[0011] In this design, the entire system of the roller in contact with the roll is still stable enough to counteract undesirable vibration at the usually large operating speed. The metallic, rolling mantle of the roller is best if made of steel and can have a radial thickness of 1 to 5 mm.

[0012] A third aspect of the invention is configured in the form of a single roller suitable for winding devices.

[0013] The rolling mantle of the roller can be made of spring steel because this steel has a particularly large range of elasticity and can adapt easily to the configuration of the roller without coming near the yield point.

[0014] The sizing of the radial thickness of the intermediate layer depends essentially on the particular case. It must be thick enough to allow adaptation of the elastically deformable rolling mantle to the perimeter of the roll without generating excessive elongations. The thickness needed for this will depend on the contact pressure and on the diameter of the roll being produced. The range coming into consideration for practical applications lies between 10 and 100 mm.

[0015] An important configuration of the invention consists in the fact that channels of at least 10 mm² are distributed in the intermediate layer along the perimeter.

[0016] The channels should have a macroscopic cross-section and not be designed as pores or similar features. They have a double function. First, they increase the flexibility of the overall configuration because the elastically flexible material of the intermediate layer--when the webs remaining between the channels are deformed, in turn, by the corresponding deformation of the roller mantle--can more easily escape to the side. The other function is a cooling function. During rotating of the roller, a considerable fulling work is performed in the material of the intermediate layer due to the deformation occurring for each revolution. Now, unless the proper precautions are taken, this fulling work will result in excessive heat-up of the elastic, flexible material. This is counteracted by the coolant.

[0017] According to claim 11, the grooves can be formed in the surface of the intermediate layer and can be open toward the interior of the roller mantle. This will make the production easier. The grooves can be provided as circumferential grooves, especially as screw-shaped perimeter grooves so that the coolant can be rather easily distributed over the entire circumferential surface. In multi-path designs, it is possible to move the coolant back and forth. If intersecting perimeter grooves are used, a waffle- or rhombic-shaped structure is obtained.

[0018] Since it is particularly important to avoid axial forces in the region of the edges of the roll, and the flexibility of the rolling mantle should be particularly large there, it can be recommended to make the grooves in the region of the edge of the working region deeper and/or wider than in the middle of the working region.

[0019] The intermediate layer can be tapered axially outside the operating region from the roller mantle outward toward the axis in order to increase the fatigue limit of the apparatus.

[0020] Since the paper are often filled with mineral strips and are abrasive, and, thus, the width of the nip in the circumferential direction of the roller may have local shifts of the paper sheet with respect to the perimeter, it may be a good idea to coat the roller mantle on the outer perimeter with a wear-reducing material, for example, a hard-metal coating. This type of coating also has the function of increasing the coefficient of friction between the roller mantle and the paper or other sheet material in order to transfer greater circumferential forces to the roll without increasing the contact pressure.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The figures show one sample design of the invention.

Figures 1 and 2 show winding devices schematically in a cross-section running perpendicular to the axis of the rollers;

Figure 3 shows a longitudinal cross-section through one end of the roller used as support, backing or driven roller.

DETAILED DESCRIPTION OF THE DRAWINGS

[0022] In Figure 1, we see a support roller roll-device (20) that is used to roll up a paper sheet (1) onto a roll (2). The product sheet (1) is being moved forward under a certain longitudinal sheet tension and is diverted downward by means of a diverter roller (3) according to Figure 1. It rolls from below around driven support roller (4) with horizontal axis, next to which another support roller (5) of the same design, likewise with horizontal axis, is positioned at the same height and with little separation. The roll being wound (2) contacts the support rollers (4,5) at points (6) and (7) with a nip pressure (8) that is obtained from the weight of the roller and the contact pressure (9) of a driven roller (11) that is located above the support rollers (4,5) and symmetrically to them and stands under the force of one piston/cylinder unit (12). The driven roller (11) serves to guide the quickly revolving roll and to ensure a uniform formation of said roll.

[0023] Figure 2 shows a support roller winding device where the product sheet (1) is being rolled up into a roll (2) that is not in contact with support rollers but rather is seated on a shaft on pivot arms (13) that stand essentially upright and are pivot-mounted at the bottom at point (14). Due to piston/cylinder units (15) articulated with the pivot arms (13), the roll (2) is pulled against a support roller (16) fixed in position at about the same height. A nip pressure (17) is produced. The paper sheet (1) moves from above via diverter rollers (18,19) onto the support roller (16) and, after passing of the nips, is rolled onto the roll (2).

[0024] Thus, the rollers (4,5,11,16) are in contact in the nips with the nip pressures (8,9,17) at the roll (2), and due to their surface behavior, they determine the package hardness of roll (2). The rollers (4,5,11,16) are, thus, essentially of the same design and are given by rollers (10) whose inner design is visible in Figure 3. The roller (10) is composed of a cylindrical, hollow roller (21) in which a rotation-symmetrical end piece (22) is inserted at the ends, for example, it is welded in, and extends outward past the end of the hollow roller (21) and there forms the roller lug (23). These parts together form the roller element (24). The illustrated configuration is sufficient when the length of the roller (10) is not too large and the load is not too great. In other cases, the hollow roller (21) can be a part of a hydraulic, internal-braced roller, for example, of a flexural-controlled roller according to DE-OS 22 30 139, for instance.

[0025] The outer perimeter (25) of the roller element (24) is cylindrical. An intermediate layer (26) made of a compact, elastic, flexible polyurethane with Shore A hardness of 50° is attached to the outer perimeter (25). The wall thickness corresponds to that of the cylindrical roller tube (21) and amounts to about 30 mm. In the outer perimeter of the intermediate layer (26), there are screw-shaped circumferential grooves (27,28) whose width is about 4 mm and whose depth is about 12 mm. In the sample design, the perimeter grooves (27,28) form a two-thread screw. The two-screw threads formed by the perimeter grooves (27) or (28) are connected by means of connecting holes (29,31) to a central drilled hole (32) in the roller lug (23) through which a coolant, for example, air or water, can be fed, which is pumped through the perimeter grooves (27,28) from left to right in Figure 3. The roller (10) is appropriately designed at the right end and contains a drain line there for the coolant. Other liquid lines are also known. It is important only that the perimeter grooves (27,28) be distributed uniformly along the perimeter and that they be relatively closely packed together.

[0026] The cylindrical, outer perimeter of the intermediate layer (26) is covered by a thin-wall roller mantle (33) of spring steel of about 2 mm radial thickness that is braced against the intermediate layer (26) and covers it over its entire surface. In addition, the downward open grooves (27,28) that have an essentially rectangular cross-section with rounded bottom are closed off on the outside by the roller mantle (33).

[0027] In the top part of Figure 3, we see the lower portion of the roll (2) that is in contact with the roller mantle (33). Its left bound in Figure 3 can pivot between the bounds (34) and (34'). The grooves (27,28) can be deeper and perhaps also wider in this region, as indicated by the dashed lines, in order to ensure a particularly elastic flexibility of the entire configuration in the edge region of the roll.

[0028] The roller mantle (33) rests essentially over the entire length of the roller and is securely touching the intermediate layer (26). But at the ends, the outer perimeter of the intermediate layer (26) moves inward at (26') away from the inner perimeter of the roller mantle (33). This feature is used to increase the flexibility and to prevent destruction due to edge effects.

[0029] The outside of the roller mantle (33) has a coating (36) of hard metal in order to counteract the long-term, abrasive effect of the paper sheet (1) and to increase the coefficient of friction between the roller mantle (33) and the paper sheet (1).

[0030] The roller (10) is relatively easy to deform in a plane perpendicular to the axis because the roller mantle (33) is made of thin, spring steel and is only elastically supported by the intermediate layer (26). The roller mantle (33) is, thus, pushed and touches the perimeter of the roll in the nip in a contact area (35) which is relatively broad, due to the contact; at any rate, it is broader than it would be for an entirely rigid counter-roller. The contact force occurring per length unit is thus distributed to this relatively large contact area (35) so that a rather low, specific nip pressure is generated which will assist in the formation of a low package hardness, which, in many cases, is desirable.

[0031] Only quite insignificant changes in length in an axial direction are connected with the deformation in the plane perpendicular to the axis, so that the roll (2) is not placed under stress in the region of its edge (2'), and the roll quality at the edge is not reduced.

Claims

1. Apparatus for winding a wound roll (2) from a traveling paper web (1), the apparatus including at least one roller (4,5,11,16) for supporting, backing or driving the paper roll (2) being wound, the roller characterized by:
   a body (24) having a cylindrical outer surface (25) and a longitudinal axis of rotation;
   a hollow, flexible, cylindrical mantle (33) disposed about the body (24) coaxially therewith, the mantle comprising a steel cylinder having a thickness of between about 1 mm to about 5 mm such as to be elastically deformable in the radial direction of the roller;
   a cylindrical, hollow, radially elastically deformable intermediate layer (26) positioned about the body (24) and extending continuously therewith, enclosed by, and supporting, the mantle (33) thereabout, the intermediate layer (26) comprising a compact elastomeric material having a Shore "A" hardness of between about 30° to about 80° and having a radial thickness of between about 10 mm to about 100 mm;
   a plurality of circumferentially extending, closely spaced channel walls defining channels (27,28) are formed in the intermediate layer (26), the channel walls extending outwardly to near the inner circumferential surface of the mantle (33), the channels (27,28) distributed over the perimeter of the intermediate layer (26) are formed such that their cross-sectional area is at least 10 mm².

2. Apparatus for winding a wound paper web roll (2), as set forth in claim 1, characterized by:
   the roller (4,5,11,16) further includes journal means (23) extending axially outwardly from either end of the body (24); and further including
   cooling fluid holes (29,31,32) formed in the body (24) of the journal means (23) at least at one end of the roll (2) for connecting the channels (27,28) to a source of coolant outside of the roller (4,5,11,16) whereby coolant can be circulated through the channels and out of the roller.

3. Apparatus for winding a wound paper web roll (2), as set forth in claim 1, characterized by:
   the channels (27,28) comprise grooves provided on the outer periphery of the intermediate layer (26), which grooves are open toward the mantle (33).

4. Apparatus for winding a wound paper web roll (2), as set forth in claim 1, characterized by:
   the channels (27,28) extend continuously in a helical pattern about the roller (4,5,11,16) for substantially the entire longitudinal length thereof.

5. Apparatus for winding a wound paper web roll (2), as set forth in claim 1, characterized by:
   the channels (27,28) are deeper and/or wider in the region of the edge of the roller (4,5,11,16) compared to their depth and/or width intermediate the edge regions of the roller.

6. Apparatus for winding a wound paper web roll (2), as set forth in claim 1, characterized by:
   the intermediate layer (26) is tapered axially (26') outside the operating area beneath the edge of the roller mantle (33) substantially beneath the location of where the mantle engages the wound paper roll.

7. Apparatus for winding a wound paper web roll (2), as set forth in claim 1, characterized by:
   the plurality of channel walls bear against the inner circumferential surface of the mantle (33) such that the grooves are open to the inner circumferential surface of the mantle.

8. Apparatus for winding a wound paper web roll (2), as set forth in claim 1, characterized by:
   a wear-reducing coating (36) is on the operating, outer surface of the mantle (33).

Ansprüche

1. Vorrichtung zum Aufwickeln einer gewickelten Rolle (2) aus einer laufenden Papierbahn (1), wobei die Vorrichtung wenigstens eine Walze (4, 5, 11, 16) zum Stützen, Tragen oder Antreiben der Papierrolle (2) aufweist, die gewickelt wird, gekennzeichnet durch:
   einen Körper (24) mit einer zylindrischen äusseren Oberfläche (25) und einer Rotations-Längsachse;
   einen hohlen, flexiblen zylindrischen Mantel (33) der um den Körper (24) koaxial angeordnet ist, wobei der Mantel einen Zylinder aus Stahl mit einer Dicke von etwa 1 mm bis etwa 5 mm aufweist, so dass er elastisch verformbar ist in der radialen Richtung der Walze;
   eine zylindrische, hohle, elastisch verformbare Zwischenschicht (26), die um den Körper (24) angeordnet ist und sich zusammenhängend über diesen erstreckt, und die vom Mantel (33) umschlossen ist und diesen stützt, und die Zwischenschicht (26) aus einem Material ist, das eine Shore "A" Härte von zwischen etwa 30° und etwa 80° aufweist und radial eine Dicke von zwischen etwa 10 mm und 100 mm hat;
   mehrere sich über den Umfang erstreckende, nahe beieinander liegende Wände, die in der Zwischenschicht Kanäle (27, 28) bilden, wobei sich die Wände nach aussen erstrecken bis in die Nähe der inneren Oberfläche des Mantels (33), und wobei die Kanäle (27, 28) die sich über den Umfang der Zwischenschicht (26) erstrecken, so ausgebildet sind, dass ihre Querschnittsfläche mindesten 10 mm² ist.

2. Vorrichtung zum Aufwickeln einer gewickelten Rolle (2) nach Anspruch 1, dadurch gekennzeichnet, dass:
   die Walzen (4, 5, 11, 16) weiter Wellenzapfen (23) aufweisen, die sich von jedem Ende des Körpers (24) axial nach aussen erstrecken; und die weiter wenigstens am einen Ende der Walze (2) im Wellenzapfen (23) des Körpers (24) Öffnungen (29, 31, 32) für Kühlmittel aufweist, um die Kanäle (27, 28) mit einer Quelle für Kühlmittel zu verbinden, die sich ausserhalb der Walze (4, 5, 11, 16) befindet, wobei Kühlmittel durch die Kanäle und aus der Walze hinaus zirkulieren kann.

3. Vorrichtung zum Aufwickeln einer gewickelten Rolle (2) nach Anspruch 1, dadurch gekennzeichnet, dass:
   die Kanäle (27, 28) Rillen in der äusseren Zwischenschicht (26) umfassen, wobei die Rillen zum Mantel (33) hin offen sind.

4. Vorrichtung zum Aufwickeln einer gewickelten Rolle (2) nach Anspruch 1, dadurch gekennzeichnet, dass:
   sich die Kanäle (27, 28) zusammenhängend in einem schraubenförmigen Muster um die Walze (4, 5, 11, 16), im wesentlichen über ihre ganze Länge erstrecken.

5. Vorrichtung zum Aufwickeln einer gewickelten Rolle (2) nach Anspruch 1, dadurch gekennzeichnet, dass:
   die Kanäle (27, 28) länger und / oder breiter sind im Bereich der Ränder der Walze (4, 5, 11, 16) im Vergleich zu ihrer Tiefe und / oder zur Breite von dazwischen liegenden Bereichen der Walze.

6. Vorrichtung zum Aufwickeln einer gewickelten Rolle (2) nach Anspruch 1, dadurch gekennzeichnet, dass:
   die Zwischenschicht (26) axial nach aussen (26') konisch ist ausserhalb des Arbeitsbereichs unter dem Rand ihres Walzenmantels (33), wo der Mantel auf das gewickelte Papier trifft.

7. Vorrichtung zum Aufwickeln einer gewickelten Rolle (2) nach Anspruch 1, gekennzeichnet durch:
   mehrere Kanalwände, die sich auf der inneren Umfangsfläche des Mantels (33) abstützen, so dass die Kanäle offen sind gegen die innere Umfangsfläche des Mantels.

8. Vorrichtung zum Aufwickeln einer gewickelten Rolle (2) nach Anspruch 1, gekennzeichnet durch:
   eine abnutzungsvermindernde Beschichtung (36) auf der äusseren Arbeitsoberfläche des Mantels (33).

Revendications

1. Appareil pour bobiner un rouleau à enrouler (2) à partir d'une bande de papier (1) qui défile, l'appareil comprenant au moins un cylindre (4,5,11,16) pour supporter, soutenir ou entrainer le rouleau de papier (2) en cours de bobinage, le cylindre étant caractérisé par:
   un corps (24) comportant une surface externe cylindrique (25) et un axe de rotation longitudinal;
   une enveloppe cylindrique, flexible, creuse (33) disposée autour du corps (24), coaxialement à ce dernier, l'enveloppe comprenant un cylindre en acier ayant une épaisseur comprise entre environ 1 mm et environ 5 mm, de sorte qu'il est élastiquement déformable, suivant la direction radiale du cylindre;
   une couche intermédiaire cylindrique, creuse (26) élastiquement déformable suivant la direction radiale, positionnée autour du corps (24) et s'étendant de façon continue avec ce dernier, enfermée dans et supportant, l'enveloppe (33) tout autour d'elle, la couche intermédiaire (26) comprenant une matière élastomère compacte, ayant une dureté Shore "A" comprise entre environ 30° et environ 80° et ayant une épaisseur radiale comprise entre environ 10 mm et environ 100 mm;
   une pluralité de parois en U, s'étendant sur la circonférence, faiblement espacées, définissant des canaux (27,28), qui est façonnée dans la couche intermédiaire (26), les parois en U s'étendant vers l'extérieur jusqu'à proximité de la surface circonférentielle interne de l'enveloppe (33), les canaux (27,28) distribués sur le périmètre de la couche intermédiaire (26), étant façonnés de sorte que la surface de leur section transversale est d'au moins 10 mm².

2. Appareil pour bobiner un rouleau, formé d'une bande de papier, à enrouler (2), tel qu'exposé à la revendication 1, caractérisé en ce que:
   le cylindre (4,5,11,16) comprend, en outre, un moyen de tourillon (23) s'étendant axialement vers l'extérieur, à partir de chaque extrémité du corps (24); et comprenant, en outre,
   des orifices (29,31,32) pour fluides de refroidissement, pratiqués dans le corps (24) du moyen de tourillon (23), au moins à une extrémité du rouleau (2), pour relier les canaux (27,28) à une source de produit réfrigérant, à l'extérieur du cylindre (4,5,11,16), par lesquels le produit réfrigérant peut être mis en circulation à travers les canaux et à l'extérieur du cylindre.

3. Appareil pour bobiner un rouleau, formé d'une bande de papier, à enrouler (2), tel qu'exposé à la revendication 1, caractérisé en ce que:
   les canaux (27,28), comprennent des cannelures, prévues sur la périphérie externe de la couche intermédiaire (26), lesdites cannelures étant ouvertes en direction de l'enveloppe (33).

4. Appareil pour bobiner un rouleau, formé d'une bande de papier, à enrouler (2), tel qu'exposé à la revendication 1, caractérisé en ce que:
   les canaux (27,28) s'étendent de façon continue en un dessin hélicoïdal, autour du cylindre (4,5,11,16), sur essentiellement la totalité de la longueur longitudinale de ce dernier.

5. Appareil pour bobiner un rouleau formé d'une bande de papier, à enrouler (2), tel qu'exposé à la revendication 1, caractérisé en ce que:
   les canaux (27,28) sont plus profonds et/ou plus larges dans la région du bord du cylindre (4,5,11,16), par comparaison à leur profondeur et/ou largeur entre les régions des bords du cylindre.

6. Appareil pour bobiner un rouleau, formé d'une bande de papier, à enrouler (2), tel qu'exposé à la revendication 1, caractérisé en ce que:
   la couche intermédiaire (26) est fuselée axialement (26'), à l'extérieur de la zone de fonctionnement, en dessous du bord de l'enveloppe du cylindre (33), essentiellement en dessous de l'endroit où l'enveloppe engage le rouleau de papier à enrouler.

7. Appareil pour bobiner un rouleau, formé d'une bande de papier, à enrouler (2), tel qu'exposé à la revendication 1, caractérisé en ce que:
   la pluralité de parois en U porte contre la surface circonférentielle interne de l'enveloppe (33), de sorte que les cannelures sont ouvertes, en direction de la surface circonférentielle interne de l'enveloppe.

8. Appareil pour bobiner un rouleau, formé d'une bande de papier, à enrouler (2), tel qu'exposé à la revendication 1, caractérisé en ce que:
   un revêtement réduisant l'usure (36) se trouve sur la surface externe, de fonctionnement, de l'enveloppe (33).

Drawing