EP0534930B1 - Apparatus for treating sheet-like materials - Google Patents

Description

The invention relates to a device for processing sheet-like material, the material being pressed onto the surface of a counter roller or a counter beam.

When processing a web, it is of course desirable that the processing is carried out uniformly on the entire web material. This is only achieved if the pressure with which the counter-roller and an adjacent processing roller press against one another is constant and is also uniform over the width. A problem that occurs again and again in this connection is the deflection of the rolls due to the large working widths, the larger the smaller the diameter of a roll and the thinner the wall thickness of a roll. On the other hand, due to the better handling of the rollers when changing over a device or during maintenance and repair work, the rollers should be relatively light and have a small diameter. Several solutions are known to solve this problem. For example, so-called floating rolls are known, the rolls being cut from the inside by e.g. hydromechanical means can be bent. However, these are very expensive to manufacture and complex to maintain and, due to the attachment of the hydromechanical means inside the roller, again require a relatively large diameter. Their axle bearings are also very expensive and complicated, and roller replacement is therefore very complex. In practice, the problem of deflection is usually solved by the fact that the rollers are rubberized and spherically ground, with the disadvantage that this roller works uniformly in width with only a single contact pressure and only with one web width. The necessary, frequent changing of the roller depending on the desired contact pressure and the desired web width is cumbersome and requires a lot of time due to the transport of the rollers, the machine downtime, the interruption of operation, and is therefore not economical.

The object of the present invention is to provide a device create, which ensures a uniform pressure at different working widths and different working pressures when using flexible, easy-to-use, easily replaceable work rolls or rollers.

Furthermore, the device according to the invention should be suitable for different processing or working pressures, i.e. e.g. for squeezing (high contact pressure) as well as for the metered application of small quantities (low contact pressure).

Furthermore, it is an object of the invention to provide a device whose working width can be adapted to the width of the material web and which enables zones with different contact pressures to be generated over the working width.

In the device according to DE-B 1 076 611, the flexible adaptation of the rollers is only given in sections, since these rollers are held in their position at intervals from roller chains, as a result of which their storage in the machine frame is unnecessary. The roller chains themselves are not resilient, rather they have the task of countering every deflection of the nip rollers, which can be achieved by adjusting screws tightening on the roller chains accordingly.

In contrast, according to the invention, the work roll should be elastically adaptable, which is achieved in that the adaptably bendable elements comprise at least one slide bearing beam or a bearing bed, in which at least one adaptably bendable roll is arranged.

Preferably, a work roll that directly executes the machining process and has a small diameter in relation to the counter roll made of flexible material is pressed onto the counter roll. The relatively small diameter of the work roll also has the advantage that a relatively high contact pressure, ie a relatively high surface pressure, is achieved by a relatively narrow pressing or contact zone. For example, if liquid is pressed out of a textile web, the liquid can flow out of a narrow pressing or squeezing zone more easily. With a higher pressing capacity, a higher working speed can be achieved and drying energy can be saved. Furthermore, it is to be regarded as an advantage that such work rolls are easy to manufacture and are easy to handle due to their small diameter and axleless storage and can be easily replaced, save space due to the compact design and can be installed in existing systems. Due to their small size, they can also be easily combined with other processing devices that work on the same lay roller.

The contact pressure can be adjusted via the control of the pressure-generating elements and can be varied within a wide pressure range. Is the pressure-generating element e.g. a pneumatic piston, the contact pressure that this piston exerts on the work roll via the adaptably bendable elements can be varied by changing the air pressure in the pneumatics. If several pressure-generating elements are arranged over the length and these are controlled separately, then zones with different pressurization can be created, as is necessary for some purposes.

The device according to the invention is described with reference to exemplary embodiments shown in the drawings. Fig. Shows a device according to the invention with a work roller pressed against a counter roll and two cylindrical pressure bodies or rollers, which rest in a common plain bearing beam or bearing bed and with a cross bar or support body or support beam. Fig. 2 is another embodiment of the invention with a different configuration of the rigid beam. Fig. 3 shows a device according to the invention, in which, in turn, two cylindrical pressure bodies or rollers are present, however, in separate slide bearings or bearing beds, the one slide bearing or bearing bed being fixed during the other is mobile. Fig. 4 shows a device in which, similarly as in Fig.1, two cylindrical bodies or rollers are arranged in a common, movable sliding bearing or bearing bed, but here the possible movement of the sliding bearing or bearing bed is not translational but a tilting movement. 5 and 6 show simple devices according to the invention, in which the work roll itself lies in a plain bearing beam or bearing bed which in the two representations is subject to the forces of different, pressure-generating elements. Fig. 7 shows a further embodiment of the device according to the invention with a plurality of cylindrical bodies, or rollers and plain bearings / bearing beds, on which force is exerted by reciprocating pistons. 8 shows a device similar to FIG. 7, with the difference that in this embodiment variant only one of the two slide bearings / bearing beds is movable and the slide bearings / bearing beds are arranged in a different position. Finally, FIG. 9 shows a device according to the invention, which is equipped with a substance supply device.

In Figure 1 it can be seen that a flexibly adaptable, axle bearing-free working roller 4 with a smaller diameter is pressed against a fixedly mounted, rigid counter-roller 2, over which a material web 1 is guided. Surround the work roll 4 with a jacket layer 20, which is smooth or structured and at most compressible and absorbs, transports and releases liquid or substance. The pressure of the work roll 4 takes place via two bendable, adaptable, cylindrical bodies or pressure bearings 45, 46 without axle bearings, which are also used for the peripheral support of the work roll 4. The two pressure bodies or rollers 45, 46 lie in a common, adaptable, adaptable slide bearing beam / bearing bed 53, to which a lifting piston 6 applies force via a plate 71 and a reinforcing plate 75. The slide bearing beam / the bearing bed 53 is guided laterally by two profile strips 80 during the resulting displacement, which, like the reciprocating piston device 6, are fastened to a fixed transverse beam or support body or support beam 3. In addition, a carrier 12 can be fastened to the crossbeam or support body or support beam 3, through which in a further slide bearing / bearing bed 50 a support roller 47 rests laterally on the work roller 4. Advantageously, the elements involved in the contact pressure (work roll 4, cylindrical pressure bodies or rolls 45 and 46, slide bearing beam / bed 53, plate 71 and reinforcement plate 75) in the work roll 4 become increasingly flexible up to the reinforcement plate 75 and can therefore bend adapt well to the previous element. Therefore, the individual elements can position themselves and there is a uniform pressure distribution and power transmission over the working width from the work roller 4 to the counter roller 2. In addition to the contact pressure, which can be caused by the reciprocating piston, as indicated by dashed lines, a contact pressure by a magnetic force generating device 9 act on the work roll, which in this case consists, at least partially, of magnetizable material.

2 shows an embodiment variant in which the work roll 4 is also circumferentially supported on two cylindrical support and pressure bodies or rolls 45, 46 arranged in a slide bearing beam / bearing bed 53. There is a deformable cushion 22 between the slide bearing beam / bearing bed 53 and the plate 71, which contributes to an even pressure distribution. All elements that contribute to the pressure of the work roll 4 against the counter roller 2 are arranged in this embodiment according to the invention within a U-shaped crossbeam or support body or support beam 32, which also acts as a lateral guide for the complex of slide bearing beam / bearing bed 53, deformable cushion 22 and plate 71 serves.

Similar to the exemplary embodiments from FIGS. 1 and 2, in the device according to FIG. 3, the work roll 4 is circumferentially supported by the cylindrical bodies / rolls 43, 44 without an axle bearing and directly executes the processing of the material web 1 at the point of contact with the counter roll 2. The work roll 4 shown here is in turn surrounded by a jacket layer 20 which consists of rubber, felt or the like, and is again smooth or structured and at most compressible and is used for receiving, transporting and dispensing liquid or substance. The cylindrical bodies / rollers 43, 44 are arranged in separate plain bearing beams / bearing beds 51, 52 and have cleaning blades 8. The special feature of this embodiment is that the slide bearing / bearing bed 51 is fixedly connected to a crossbeam or support body or support beam 31, an elastic cushion 21 being able to be provided between the crossbeam or support body or support beam 31 and slide bearing / bearing bed 51, while the slide bearing / Bed 52 is also arranged via a deformable cushion on a plate 71 which is articulated to a fixed support 10. On the plate 71, a piston 6a, 6b, 6c attached to a crossbeam or support body or support beam 3 exerts its force, which then acts via the cylindrical pressure body / the pressure roller 43 and the work roller 4 as a pressure force in the point of contact with the counter-roller 2 . The support body / the support roller 44 acts as a counter pressure body. The movable plate 71 is connected in an articulated manner to a support 10, so that it is not possible to lift the plate 71 at this connection point, which results in a leverage effect which, depending on the position of the point of action of the reciprocating piston, transfers the force (position 6a) (position 6b) or reinforced (position 6c). The plate 71 is preferably inclined with respect to the horizontal.

Another particularly advantageous embodiment of the device according to the invention is shown in FIG. 4. Here, the cylindrical pressure bodies or rollers 45, 46, as in FIGS. 1 and 2, are arranged in a common plain bearing beam / bearing bed 53 which rests on a plate 71. The plate 71 lies on one side in a force-absorbing holder 11 which enables mobility, is inclined against the horizontal and has on its underside a reinforcing plate 75 at the point at which the reciprocating piston 6 engages. The lever-like force transmitted from the reciprocating piston 6 to the plate 71 is transmitted via the slide bearing bar / the bearing bed 53 and the cylindrical pressure bodies or rollers 45, 46 to the work roller 4 which is circumferentially supported without an axle bearing and which is thus pressed against the counter roller 2. Cleaning doctor blades 8 rest on the cylindrical pressing bodies or rollers 45, 46. The two editing Excess substance runs over one of these cleaning blades and a slanted surface of the plate 71. Furthermore, as shown in broken lines, a strip 15 can be attached to the slide bearing beam / bearing bed 53, which prevents the substance located on the surface of the sliding bearing beam / bearing bed 53 from reaching the area behind this strip 15.

This compact arrangement of rollers or cylindrical bodies with this preferably one-piece plain bearing beam / bearing bed and laterally attached limiting parts (not shown) enables easy handling and cleaning and very clean working in that the substance is kept in a limited area and is derived therefrom.

In Figure 5, the number of adaptably bendable elements is reduced to two pieces, namely the work roll 4 and a slide bearing beam / a bearing bed 5 resting thereon. The contact pressure is generated here by an expandable hose 60 which lies in a recess in the slide bearing beam / bearing bed 5 and presses against it and a stationary crossbar or support body or support beam 3. The plain bearing beam / bearing bed 5 is guided between plates 81.

The device in FIG. 6 has an equally simple construction. In a U-shaped crossbeam or support body or support beam 32, a reciprocating piston 6 is arranged, which presses against a plate 7, which carries a flexibly adaptable slide bearing / bearing bed 5. In this slide bearing / bed 5, the flexibly adaptable work roll 4 is arranged, which is pressed against the counter roll 2 with the web 1 guided thereon. As can clearly be seen, the work roll 4 has a considerably smaller diameter than the counter roll 2. A plurality of reciprocating pistons 6 are arranged over the working width and can be controlled separately and thus adapt the bendable pressure elements 5 and 4 to the counter roll 2. On the work roll 4, as seen in the running direction of the counter roll 2, behind the point of contact with the latter, there is a doctor blade 8, the contaminants scraped off, which were transferred through the web 1 to the work roll 4.

7 shows two U-shaped crossbeams or supporting bodies or supporting beams 32, each of which carries a plurality of reciprocating pistons 61, 62, which act on plates 7, which in turn bendable slide bearings / bearing beds 5 for cylindrical pressing bodies or rollers 41, 42 carry. A cleaning squeegee 8 bears against each of these cylindrical pressure bodies or rollers 41, 42. On the two cylindrical pressing bodies or rollers 41, 42, the working roller 4 lies circumferentially supported without an axle bearing and carries out the processing by pressing against the counter roller 2. In the example shown here, the force of the reciprocating pistons 62 acts on the working roller 4 in an approximately vertical direction via the cylindrical support body or roller 42, while the force of the other reciprocating pistons 61 acts on the working roller 4 in via the cylindrical pressure body or roller 41 approximately horizontal direction. The direction of the contact pressure of the work roll on the counter roll results from the summation of the two forces. As also shown here, the contact pressure can be additionally increased by a magnetic force generating device 9 if the work roll 4 is at least partially made of magnetizable material.

In FIG. 8, too, there are two cylindrical bodies or rollers 41, 42 in separate slide bearings / bearing beds 54, 55. Here, however, a contact pressure is exerted only via the cylindrical pressure body or roller 41 and the slide bearing / bearing bed 54 by means of an expanding hose transfer the work roll 4. The plain bearing / bed 55 is firmly connected to the crossbeam or support body or support beam 31 via a deformable cushion 22 and the cylindrical body or roller 42 located in this plain bearing / bed 55 only acts as a support and counter pressure roller or body. As can be seen, the two crossbeams or support bodies or support beams 31, 33 rest on fixed supports 13, 14, which are inclined in the opposite sense by approximately 45 ° to the vertical, so that the direction indicated by arrow 90 of the contact pressure is approximately vertical . The carrier 13 guides the slide bearing beam / the bearing bed 54 its contact movement.

In Fig. 9, as a detail, a substance supply for a device according to the invention is correspondingly e.g. Fig.1 or Fig.4 shown. Two cylindrical pressure bodies or rollers 45, 46 are arranged in a joint, flexible, adaptable slide bearing beam / bearing bed 53, and a working roller 4 is circumferentially supported on them. The space 67 enclosed by the slide bearing beam / the bearing bed 53, the cylindrical pressure bodies or rollers 45, 46, the working roller 4 and lateral sliding sealing plates is used as the liquid space. Substance is supplied to this space 67 via a line 65. The liquid space 67 is connected via the line to a liquid storage container 66, which has a slightly higher level, which is controlled by a level probe 68.

Claims (14)

1. Device or system for the processing of material in form of a WEB, at which the material is pressed to the surface of a counter-roller or of a counter-bar, and at which, except the counter-roller / counter-bar (2), a distant from - and parallel to the latter named roller/bar is existent, in fixed position, a bending proof transversal bar, sustaining body, carrying bar or similar (3,31,32,33), in which or on which pressure-power generating elements (6,60-62) are fastened - and in the space between counter-roller / counter-bar (2) and the transversal bar, (3,31,32,33) and in contact to the counterroller resp. counter-bar (2) is one working roll (4), born without axle-bearing, of adapting bendable features, executing the pressing-on effect to the WEB, (1) whereas adapting bendable elements who have the task to transfer the pressing-force on the working roll (4) and the counter-roller or counter-bar (2) respectively to the WEB (1), are dispositioned in said interspace between the counter-roller / counter-bar (2) and the transversal bar resp. sustaining body or carrying bar (3,31,32,33), characterized in that the adapting bendable elements comprise at least one slide-bearing carrier, resp. one pillow-bed (5, 51-55), in which at least one adapting bendable roll (4; 41-47) is positioned.
2. Device according to claim 1, characterized in that the adapting bendable roll is the driving roll (4) itself.
3. Device according to claim 1, characterized in that the working roll (4) executing the processing procedure directly at the counter-roller (2) does have, compared to the counter-roller, a small diameter.
4. Device according to claim 1 or 3, characterized in that the adapting bendable rollers do have the form of cylindrical bodies resp. without axis-bearing positioned rolls (41-47), which are transmitting the pressure-force on the working roll (4)
5. Device according to claim 4, characterized in that two cylindrical bodies or rolls (45-46) are dispositioned in one common slide-bearing carrier / - pillow bed (53)
6. Device according to one of claims 4 or 5, characterized in that the cylindrical bodies resp. rolls (41-47) are driven circumferentially.
7. Device according to one of claims 1 to 6 , characterized in that the working roll (4) does have a surface made of rubber, felt or similar, or is wrapped by a corresponding layer (20), either polished or structurized and equally able to be compressed or to take-up, transport and to deliver substances.
8. Device according to one of claims 1 to 7, characterized in that the pressure-generating elements are distributed i.e. positioned over the length, the zones being submitted to different pressure applications, if needed.
9. Device according to claim 8, characterized in that the pressure-generating elements are expanding hoses (60), while under pressure by liquids.
10. Device according to one of claims 1 to 9, characterized in that the pressure-generating elements (6,60-62) are situated under pressing contact with a plate (7,71) which is carrying the working roll (4) and the bendable elements (4,41-25,47, 5, 51-55)
11. Device according to claim 10, characterized in that the plate (71) is flexible conncected on one side to a carrier element (10,11) and thus forming a lever design, which, depending on the point of impact of the pressure-generating elements on to the plate (71), does have either a pressure- or power-increasing, - transmitting or reducing function.
12. Device according to one of claims 10 or 11, characterized in that on the plate (71) specifically on the spot on which the pressure takes effect, a reinforced plate (75) is provided for.
13. Device according to one of the preceding claims, characterized in that in contact with the counter-roller (2) or the counter-bar, various processing stations are located.
14. Device according to one of the preceding claims, characterized in that the counter-roller (2) is a hollow roller, in which magnet-power-generating systems are coordinated to one or more processing stations.

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