EP0478534A2 - Device for dosed application or removal of a liquid on a surface - Google Patents

Abstract

The invention relates to a multipurpose processing device for the metered application or removal of liquids and/or free-flowing substances with an axially movable, circumferentially mounted or circumferentially held working roller (3) which is pressed against a corresponding roller or against a corresponding surface (not via its axle and not via the axle pins, respectively) and which, apart from in the circumferential or outer case region which brings about the transfer process, rests with pressure acting on it (presses) against at least two further surfaces which can each be an elastic plate or plates (10) or a counterpressure slide plate or plates or drum or drums or roller or rollers or cylindrical bodies or one or more brush strips which are identical in function to said or plates and which carry out a function which determines or is involved in determining the amount of fluid or free-flowing substance, which is to be applied or removed, on the working roller (3), as a result of which the amount of fluid or free-flowing substance to be applied to or by or removed from or taken out of the material web or the web-shaped material is also determined indirectly, that is to say as a consequent effect. <IMAGE>

Description

There are devices for applying liquids or flowable substances and devices for removing or removing liquids or flowable substances on or from webs.

The invention presented herewith has a multi-purpose processing device for the dosing application or removal or removal of liquids and / or flowable substances on or from a material web or web-shaped material, which can possibly also be in pieces with an axially movable , circumferentially mounted or circumferentially held, against a counter roller or against a counter surface (not on its axis or not on the journal), the contact pressure of the working roller either by magnetic force, medium mechanically induced forces, such as hydraulically or pneumatically, or magnetically and mechanically combined pressing can take place.

In addition to the factual content of the invention, it is new according to the invention to be able to apply or remove substances with one and the same device and to be able to press on a processing roller (optionally) by means of mechanically or magnetically or mechanically and magnetically induced forces.

The device according to the invention avoids the known disadvantages of rollers pressed axially against one another and can be produced in different embodiments and in some variants can also be combined with screen cylinders (circular templates).

In its simplest embodiment, the device according to the invention consists of either an axially mounted roller (counter roller), which can either be a so-called magnetic roller, a solid roller or tube roller, or a counter surface, which can be, for example, a magnetic bar (magnetic table), and one , on this roller or surface circumferentially mounted or circumferentially held, axially movable, adjacent work roller (pressure roller) which by means of mechanically and / or magnetically induced force or forces on this counter roller or counter surface is pressed.

According to the invention, the work roll rests on the pressure or pressure on at least two other surfaces, in addition to the circumferential or casing area causing the transfer process, each of which has (an) elastic plate (s) or (one) these counter-pressure sliding plate (s) with the same function. or roller (s) or roller (s) or one or more brush strips, which have a function which determines or co-determines the application or quantity of liquid or flowable substance on the working roller, which indirectly, i.e.. H. as a result of this, the application or purchase amount of liquid or flowable substance on the material web or the web-shaped material or from or from this is also determined.

The work or pressure roller and / or the counter roller or surface is / are preferably provided or surrounded with a liquid or substance-absorbing, transporting and dispensing surface or jacket layer.

The feature which is characteristic of the invention is advantageous in that devices of some embodiments produced according to the invention can be used in both directions of movement of the goods; for from top to bottom and also for webs entering the device from bottom to top.

FIGS. 1 to 12 illustrate the invention in several exemplary embodiments or construction variants and describe it below. In summary, it should be said that devices according to the invention can be manufactured or used in any spatial arrangement, although some adaptations that take into account the flow behavior due to gravity and viscosity or the required sealing of the device against undesired liquid or substance leakage may be necessary .

1 and 2 show two similar, simple embodiments of the main idea of the invention. In both examples, a cross section of an axially mounted and preferably axially driven roller or counter roller is shown, which in these examples is designed as a so-called magnetic roller 101, ie as a roller consisting of a hollow cylinder, in which a magnetic force generating device 2 is arranged. At the jacket region closest to this magnet device, there is a non-axially mounted or non-axially fixed, at least partially made of magnetizable material working roller 3 (magnetic pressure roller) on the counter roller or magnetic roller 101. By activating the magnetic device 2, the work roll 3 is magnetically attracted against the roller 101, whereby a pressure zone 5 is formed, the width of which depends on the diameter and the surface condition of the roller 101 and the work roll 3 and on the nature of the web passing through the pressure zone 5 6 depends.
The work roll 3 can be set in rotation by the contact pressure acting in the operating state of the device or by the resulting frictional connection through the lateral surface of the axially driven roller 101. However, an axially driving force can also be introduced into the work roll 3; this additional driving force means that the work roller 3 can be rotated selectively with the same, greater or lesser peripheral speed than the roller 101.
The work roll 3 lies in a profile body 9 which is equipped with an elastic plate 10 which, elastically stretched, lies tangentially against the work roll 3 with the contact pressure corresponding to the pretension. In this profile body 9, a trough 18 is formed which serves to receive application liquid.
In addition to the arrangement shown, the two embodiments shown in FIGS. 1 and 2 are possible in any other spatial arrangement pivoted about the longitudinal axis 42, since the trough 18 containing the liquid or substance is to be understood as a space that is closed on all sides which the liquid can be introduced through a liquid supply 20, for example a pipe feed line.
The work roll 3 is equipped or shaped in the area of its jacket, which is indicated in the drawing by the double line of the jacket, with liquid or substance-absorbing property or jacket layer.
This can be, for example, a wire winding or a textile or a porous and compressible sheathing made of any other material.
In any case, the application technique used according to the invention consists in this coating layer represented by the double line, which can either be hard (wire winding) or which can be soft and compressible, into the application liquid or flowable part of the jacket region that passes through the trough 18 during the rotary movement of the work roll 3 Allow substance to penetrate, then in the contact area of the elastic plate 10 or a correspondingly shaped and evenly pressing body in the contact area to remove the amount of liquid or substance that is undesirable for the subsequent application process, which is the case with a hard coat layer due to tangential contact or with a compressible coat layer by stripping and, if necessary, increasing the stripping effect, compressing the surface layer compressing the surface or elastic plate 10.
Then the work roll 3 is moved by its further rotary movement in the direction of the pressure zone 5, in which the liquid or substance transfer process takes place. The transmission quantity and the penetration depth are controlled by the device according to the invention with several parameters, in particular by the liquid or substance absorption capacity of the outer layer of the work roll 3, by the metering pressure applied in the contact area and by the pressure in the pressure zone 5, in its intensity and uniformity of the contact pressure can be precisely adjusted across the width.
This contact pressure between the magnetic roller 101 and the work roll 3 in the contact area is preferably set, or according to the representations in FIGS. 1 and 2, electro-magnetically. This electromagnetic pressure has the advantage of precise adjustability and contact pressure uniformity over the entire working width has the additional advantage of being able to divide the contact pressure over the entire working width into individual, optionally jointly or individually controllable electromagnetic pressure zones. This zone division can compensate for any bending of the roller and / or the work roll 3 caused by the contact pressure.

In addition to the application technique described above, a device according to the invention can also be used to remove a liquid or a flowable substance from or from a product web 6. This is possible both with a hard jacket, which can be smooth or structured, such as wire wrapping, and is also possible with a soft covering, which is either only elastically soft, such as a rubber layer, or elastically or compressible, and at the same time, porous, such as a covering made of textile material.
In particular, in this last-mentioned device-technical or process-technical variant, apart from normal squeezing, which takes place according to the known state of the art (squeezed-off liquid flowing out of the pressure zone 5 downwards), an additional liquid or moisture removal or removal can take place in that due to the relaxation of the textile covering of the work roll 3 compressed in the pressing zone 5 when the pressure zone 5 is released, an additional liquid or moisture removal from the web 6 takes place by transfer into this covering of the work roll 3.

The above-described working technique according to the invention can also be used in an advantageous manner and in particular if the web of material entering the pressing zone 5 does not have such a large amount of liquid, for example. Excess substance leads to an outflow of the squeezed-out liquid or substance quantity caused by the pressure zone 5.
In this case, it is possible to set such a strong contact pressure in the contact area of the elastic plate 10 that that in the contact zone 5 amount of liquid taken from the web 6 in the contact area 11 is taken from the coating layer of the work roll 3.
The liquid removed from the jacket area of the work roll 3 in this manner, which was supplied to the device according to the invention by the web 6, is collected in the trough 18 and discharged or can be discharged by a device not shown in FIGS. 1 and 2, following gravity , drain off by themselves, provided that the trough 18 of the profile body 9 is opened on the sides or drain openings are made in the trough bottom.

In Fig.1 there is on the inner wall of the profile body 9, against which the application roller 3 rests, in this contact area e.g. Longitudinal creasing 43, through which liquid or substance residues adhering to the work roll 3 after leaving the pressure zone 5 can get back into the trough 18 through these grooves or other functionally identical recesses.

1 shows the application device according to the invention in the operating state, FIG. 2 shows a device which has been slightly changed compared to FIG. 1 in the idle state, but the operating state is also shown in a broken line.
The difference that widens the concept of the invention is that in addition to the elastic plate 10, a further identical or at most similar flexurally elastic plate 44 is arranged symmetrically or approximately symmetrically to the plate 10.

Correspondence between the two FIGS. 1 and 2 exists according to the invention in the presence of a total of three contact areas, on which the work roll 3 on the magnetic roll 101, on the elastic plate 10 and in FIG. 1 on the longitudinal groove 41 and in FIG. 2 on the elastic plate 44 is present.

3 shows a similarly simple embodiment of the invention, in which the profile body 9 serves as a slide bearing and pressure bar. On the plain bearing beam acts, indicated by the arrows 90, a force which is applied, for example, by reciprocating pistons, and this force is transmitted to the work roll 3 and increases the contact force of the work roll 3 generated by the electromagnet 2 on the counter roll 101. Instead of on the side Wall of the trough 9, as in FIG. 1, the work roll 3 is supported laterally against a brush strip 70 mounted in the trough 9, which vented the optionally structured surface or jacket layer of the work roll 3 and cleans the work roll 3.

In the device shown in FIG. 4, the supporting, cleaning and, if necessary, venting the surface or the jacket layer is designed as a brush bed 77 which surrounds a region of the circumference of the work roll. The base of the brush bed 77 also forms the space for the liquid or substance to be applied or removed. Behind the pressure zone of the work roll 3 with the counter roll 101, there is a cleaning squeegee 138 on the work roll 3 which frees the work roll 3 from impurities which are transferred from the web 6 to the work roll 3 in order to keep the substance in the liquid space clean.

As shown in Figure 5, the work roll 3 can also be mounted between a plurality of brush strips 71-73, which in this case are attached to the bottom and the side walls of a profile body. Such a system composed of elements has advantages if e.g. Work rolls with different diameters are used in this device; but also for maintenance and repair work, since the individual elements can be removed and replaced.

6 shows a further exemplary embodiment of the device according to the invention, in which the work roll 3, in addition to the counter roll 2 with the web 6, also bears against a metering roll 85 with a smaller diameter. The dosing roller 85 is rotating in a notch in the profile strip 80 which, together with the dosing roller 85, forms the liquid space for the substance to be applied. Behind the pressure zone the work roll 3 with the counter roller 2 are brush strips 74 u. 75 on work roll 3. These brush strips 74, 75 are located in guides 81, which allow radial movement of the brush strips 74, 75 with respect to the work roll 3. This means that they can adapt to a movement of the work roll 3 and are always in contact with the work roll with the same pressure, for example caused by gravity.

FIG. 7 shows a device according to the invention, in which several ideas that design or expand the invention are shown. The roller pressure can be effected in this device either by means of magnetic force, for example magnetic roller 101, or with pneumatic or hydraulic pressure generating elements, which are not shown in the drawing in FIG.
The profile body 27 can either be fastened to round bolts 31, 32 or can rest horizontally displaceably on a carrier 45 in the direction of the double arrow 46.

If the profile body 27 is fastened to a machine frame (not shown in the drawing) by means of two round bolts 31 and 32, i.e. fixed in the operating state, it can be pivoted outside the operating state around the round pin 31 as a swivel joint or as a pivot axis. For this purpose, the round bolt 32 is loosened and the profile body 27 can be pivoted away together with the device parts held around it, making the work roll 3 accessible for maintenance work or for changing the roller.

The profile body 27 has in its cross section a shape similar to the letter E, ie three horizontally extending webs and two cavities located in between, which can be used as a liquid container.
The device Figure 7 can be used in both directions of the goods or the direction of rotation of the rolls, which is represented by three double arrows 47 a, b and c. In or on the lower horizontal leg 48 are an elastic plate 10, which serves as a cleaning scraper blade elastic plate 138, a row of spray nozzles 49 with an associated liquid supply 50 and a liquid supply 20 are arranged, from which application liquid 19 can be introduced into the trough 18.
The application liquid 19 can alternatively also be introduced through the liquid supply 50 or the spray nozzles 49 or sprayed onto the work roll 3, or the work roll 3 can optionally be sprayed or sprayed with a cleaning liquid 51 instead of the application liquid 19. If the device is put into operation in the direction of travel 7 a and in the corresponding direction of roll rotation 7 b and 7 c, the elastic plate 138 becomes temporary from the device. The procedure is otherwise the same as already explained in the previous figures.
The elastic plate 10 a used in the upper horizontal profile leg 52 is formally and functionally equivalent to a second elastic plate 10. In the use of the device described above, this plate 10 a is not functionally required, but also does not interfere and can, in an auxiliary function, be used to fix the position of the work roll 3, which is freely movable and in any case not axially fixed.

If the device shown in FIG. 7 is put into operation in the opposite working direction 21 a, b, c, the flexurally elastic plate 10 a is assigned the same work function as the plate 10. The liquid supply also takes place in the direction of travel 21 a with the devices provided in the lower horizontal leg 48, or similar devices can also be arranged in the upper horizontal profile leg 52. In this case, the configuration of the short, central horizontal profile web 53 according to the invention can be used. An elastic strip 54 can be used in this profile web 53, which has the function of separating the upper liquid space 181 from the lower liquid space. This liquid separation can be improved by a further elastic strip 55, which is arranged symmetrically therewith and is shown in broken lines.

Instead of these two elastic strips 54 and 55, it is possible to extend the central horizontal profile web 53 in the shape 56 shown in broken lines and to shape it in such a way that a concave recess 28 is formed as a curved contact and sliding surface, which may or may not have a drawing shown sliding and wear surface can be equipped. This expansion of the profile body 27 makes it possible to be able to use the profile body 27 to initiate the contact pressure. The contact pressure can be introduced in the direction of arrow 29 in the area of the central horizontal profile web 53 or can e.g. can also be initiated in the area of the stake out 32 in the direction of the arrow 57 if the round bolt 32 is loosened or not installed. In this case, the carrier 45 is also not required, but only the round bolt 31, which also serves as a swivel joint.

FIG. 8 shows a device according to the invention in a greatly reduced size. The goods are guided in the horizontal direction by arrows 58, each of the three rollers being partially wrapped around by the web. The profile body 9 is formed as a storage trough for the application liquid and as a holder of the elastic plate 10. The direction of rotation of the three rollers results from the direction of the goods. The liquid transfer to the web 6 begins in the pressure zone 5, is continued on the contact path of the web on the work roll 3 and ends in the pressure area 22 between the magnetic roller 142 and the work roll 3.
This embodiment shown in FIG. 8 is particularly suitable for those goods that have only a low liquid absorption capacity.

Fig. 9 is another device according to the invention, shown on a greatly reducing scale.
This embodiment variant of a device according to the invention shown in FIG. 9 enables the use of a work roll 3 with a jacket surface or casing which is only slightly slidable, but which is nevertheless to be pressed relatively strongly. It may be that the magnetic force generating device 2 of a magnetic roller 101 is not for has or is able to exercise the required purpose with sufficient strength; For example, because perhaps the roll shell of the roller 101 is too thick overall due to a particularly long length or the required particularly soft or strong rubber coating, or because of a relatively thick covering layer of the work roll 3 or because of a very small dimensioning of the diameter of this roll and consequently a too small one magnetizable mass of this work roll 3.
In some cases there may also be compelling reasons that no electrically generated magnetic force may be used, e.g. B. when using explosive application fluids.

The representation shown in FIG. 9 lies the further step of the invention, to press the work roll 3 - if necessary in addition to its magnetically effected contact pressure - by means of two rolls or cylindrical bodies 59, 69, each of which lies against a surface line on the work roll 3, which in one with two slide bearings 281 and 282 provided profile body 27, which acts as a slide and pressure bar are mounted.

If the device according to FIG. 9 is used in a liquid or substance application function, the application liquid or substance is introduced into the trough 18 through (at least) one feed opening 61 and from here, following the respective direction of rotation of the work roll 3, according to the Passing through one of the two dosing and pressing areas 62, 63 of the pressing zone 5. The properties of the two rollers 59 and 60 also have an advantageous effect in the case of liquid-wiping use.

10 shows the possible application of an application device according to the invention for circular stencil or screen cylinder applications. The embodiment of FIG. 10 corresponds approximately to the embodiment of FIG. 2 turned through 180 °, which is why a repetition of the explanation given for this can be dispensed with. The elastic strip 54 has the same function as that in FIG. 7 Elastic strips 54 shown, the feed openings 61 have the same function as the feed opening 61 shown in FIG. 9. It goes without saying that the application device shown in FIG. 10 also requires the location fixation, which, like in most of the other figures, is illustrative is not shown. The counter-pressure surface already mentioned in the introductory text is shown as an example in FIG. 10 as a magnetic table 103.

11 shows a device according to the invention in two construction variants.
On a roller 101 which is equipped with a magnetic device 2 or, as a variant, drawn on a roller 102 which is not a magnetic roller, there is a working roller 3, which in the direction of arrow 4 of the pressing zone 5 on the roller 101 or 102 or the in the pressure zone 5 located web 6 is pressed. The roller 101 or 102 is moved in the direction of arrow 7b or the web 6 in the direction of arrow 58; the work roll 3 is also set in rotation by circumferential contact and / or axial drive; likewise the role 14a.

Shown in dashed lines is a pressure device, similar to that of FIG. 9, with two rollers 59, 60 which are pressed against the work roller 3 in the direction of arrow 29 by means of a profile body 27, which acts as a slide and pressure beam. The profile body 27 is at the same time designed as a trough 18 and connected to a liquid supply device.

The pressure elements 27a and 30a and the pressure-generating element 36a act in the direction of the arrows 65 against the work roller 3 or through it continuously against the roller 14a (functionally the same as the plate 10a in FIG. 7), the counterforce 66 of which is in a counter-pressure bar 27b designed in the form of a plain bearing is stored.

8 and 10 by means of magnetic force thus takes place in an inventive and functionally identical manner as shown in FIGS. 7 and 9. This creates the new, additional one Invention-characterizing advantage that the amount of pressure acting in the direction of arrows 65/66 acts independently of the pressure acting in the direction of arrows 29 and 4 and can therefore also be set independently of this.

FIG. 12 shows an embodiment of a device according to the invention pivoted 90 ° with respect to FIG. 11 with a roller 102, in which a roller 14a and instead of the two rollers 59, 60 a roller 14b are present. The roller 14b effects or transmits the contact pressure acting in the direction of the arrow 29 or 4 and is thus functionally identical to the two rollers 59 and 60 in FIG. 11. The roller 14a is functionally identical to the roller 14a in FIG. 11. The parts 27a, etc. that generate the impact force are here assigned to the roller 14a, and the functions performed in FIG. 11 by the counter-pressure beam 27b in the form of a slide bearing are performed in FIG. 12 by a counter-pressure sliding plate 100.

The function of this counter-pressure plate 100, whose contact surface on the work roll 3 can also be arched or inclined, is e.g. equal to the function of that leg of the professional body 9 which is provided with the longitudinal groove 43 in FIG. 6 or similar to the elastic plate 10 in FIG. 8 or the elastic plate 10 or 10a in FIG. 7.

Claims (20)

Multi-purpose processing device for dosing application or removal or removal of liquids and / or flowable substances on or from a material web or web-shaped material, which can possibly also be in pieces with an axially movable, circumferentially supported or circumferentially held, to one Counter roll or work roll pressed against a counter surface (not over its axis or not over the axle journals), characterized in that the work roll (3) rests on at least two other surfaces (pressing) in addition to the circumferential or casing area causing the transfer process , the (elastic) plate (s) (10, 10a) or (one) of these (these) functionally identical back-pressure sliding plate (s) (100) or roller (s) or roller (s) or cylindrical bodies (14a, 14b, 59, 60 or 142) or one or more brush strips (70-75.77) can be one, the application or purchase amount of liquid or w. perform flowable substance on the work roll (3) determining or co-determining function, which indirectly, i.e. as a result of this, the application or purchase amount of liquid or flowable substance on the material web or the web-shaped material or from or from this is also determined. Device according to claim 1, characterized in that the pressure roller or working roller (3) and / and the counter roller (1, 101, 102) or surface provide a liquid or substance-absorbing, transporting and dispensing surface or jacket layer or is surrounded. Apparatus according to claim 2, characterized in that the jacket layer consists of a wire winding, of rubber, of felt, of porous plastic or the like. Device according to one of the preceding claims, characterized in that the two pressing or cylindrical surfaces Bodies or rollers (59, 60), the pressure of which is brought about by a slide bearing body, which presses against the cylindrical bodies / rollers, or a bearing bed, which is at the same time a pressure body (27). Device according to one of the preceding claims, characterized in that a roller pressing against the work roller (3) serves as a dosing roller. Device according to claim 5, characterized in that both the working roller (3) and the dosing roller are mounted without an axle bearing. Device according to one of the preceding claims, characterized in that the working roller and / or the dosing roller are / is driven axially and, if appropriate, have different peripheral speeds. Device according to one of claims 5-7, characterized in that the dosing roller is coated and / or structured. Device according to one of the preceding claims, characterized in that the pressing of the working roll (3) is effected by pressing, possibly via its jacket, by means of a pressing body similar to a slide bearing, preferably consisting of easily bendable material. Device according to one of the preceding claims, characterized in that the flexible plate or plates (10, 10a and 44), depending on the device setting, indirectly, i. H. acting on the work roll (3), is or will be tensioned by magnetic force and thus the contact pressure can be magnetically adjusted. Device according to one of the preceding claims, characterized in that an elastic plate (138) as a cleaning scraper blade for cleaning the work roll (3). Device according to one of the preceding claims, with pressure elements (27a, 30a, 100) and pressure-generating elements (36a), characterized in that the pressure elements (27a, 30a, 100), the pressure-generating elements (36a), the rollers or rollers ( 4a, 4b, 142), the elastic plate (10) and the profile body (27) are arranged such that, in addition to the direction (29.4) of the contact pressure effect existing for the application or removal or removal process, a second direction one Contact pressure or counterpressure force (65.66) exists, which can either run obliquely to the first-mentioned direction of force (29.4) or perpendicular to this. Device according to one of the preceding claims, characterized in that the counter roller or the counter surface is rigid, the work roller (3), on the other hand, is bendable and / or deformable and adapts to the counter roller or counter surface and which abuts the work roller (3) Plates, rollers, plain bearings or brush strips are still bendable than the working roller (3). Device according to one of the preceding claims, characterized in that the brush strip (70-73, 77) which bears against the work roll (3) and is adapted to bend is immersed in the liquid or flowable substance (19) to be applied / removed. Device according to one of the preceding claims, characterized in that the work roll rests on two or more brush strips (71-73). Device according to one of the preceding claims, characterized in that the brush strip which presses against the work roll (3) is a brush bed (77) which surrounds a region of the circumference of the work roll (3). Device according to one of the preceding claims, characterized in that the pressing of the work roll (3) against the counter roll or counter surface (101, 102) optionally or combined by magnetic, mechanical, pneumatic or hydraulic devices, which acts either directly or indirectly via elastic plates, rollers, slide bearings or brush strips on the work roller (3). Device according to one of the preceding claims, characterized in that by the elastic plate (10, 10a, 44) and / or the rollers or rollers (14a, 14b, 59, 60, 142) a two-stage, spatially and temporally successive, the Application, acceptance or removal process influencing, contacting or pressing on or, if necessary, also compressing the work roll (3) or its coating layer takes place. Device according to one of the preceding claims, characterized in that magnetic, hydraulic, pneumatic or mechanical means can optionally be used for the pressing in the same device. Device according to one of the preceding claims, characterized in that magnetic, hydraulic, pneumatic or mechanical means can be used in any combination for the pressing in the same device.

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