EP0311745B1 - Coating device - Google Patents

Abstract

The doctor device has a profile member pivotally mounted to a retaining member that is carried on a mount. Vertical movement of the mount causes angular displacement of the profile member thereby changing the material applicaton area disposed adjacent and upstream of the doctor. The doctor is either a doctor blade or roll doctor. In the case of a roll doctor, a receptacle is formed in the profile member and the roll doctor is magnetically retained with the receptacle. During application of a material to an application surface with the roll doctor, the roll doctor is magnetically attracted to the application surface by a second magnetic device located beneath the application surface or work surface.

Description

The invention relates to a device for applying application material, such as possibly foamable substances of different viscosities, coating materials, lacquers, adhesives, pastes or the like. on a substrate such as a web of material with at least one pressing part which is continuous and flexible in the length of the device (application width) and which is provided for engaging in a substrate path and with pressing means arranged on the pressing part, wherein the pressing means are divided over the length of the application device into segments forming a pressing device, which are arranged in a link-like manner, and wherein the pressing part can be acted upon by the body mass of all segments of a certain pressing force. Such an application device is used in machines for flat stencil printing, circular stencil applications and / or devices for stencilless full-area applications, the application width or the extent of the pressing part being able to be several meters. Depending on the area of application, sample applications (printing) and / or full-surface applications (e.g. impregnation, coating, dyeing, painting) can be carried out.

According to a known device of the type mentioned (US-A-3 592 132), thin armature sheet metal parts are arranged as pressure segments on a doctor body. The squeegee body is directly and firmly connected to leaf springs. As a result of the narrow anchor plate segments, the magnitude of the contact pressure is essentially only determined by a magnetic bar arranged below a web. The leaf springs must be designed to be resilient in a special adaptation to the squeegee body. The connection of the doctor body with the leaf springs is relatively complex to manufacture. The shape or choice of the squeegee body is restricted due to the necessary moldings for a firm connection to the leaf springs.

Solid squeegee strips (pressure parts) with a length of several meters are also used. Due to their inherent rigidity over the application width, these have a considerable curvature, which adversely affects the desired straightness of a squeegee strip for contact with a substrate such as a material web. Mechanical pressing of such a squeegee strip requires complex squeegee holders with which contact forces are exerted on the ends of the squeegee strip. Clamping the squeegee between the brackets leads to undesirable deflection. It is also known to magnetically press solid strips and doctor or roller doctor blades made of magnetizable material against a magnetic bar arranged below the web. Either a steel doctor blade is pressed against the web (DE-AS 1 135 856), or a magnetizable rod is arranged on the back of a sheet-shaped doctor blade, with which a doctor blade is pressed against the web (CH-PS 571 952, DE -OS 34 19 590). Disadvantages of this magnetic squeegee pressure are the dependence of the contact pressure on the magnetizable mass or the cross section of the squeegee bar and on the distance between the magnetic force generating and magnetizable device parts. As such, the squeegee must be made of magnetizable material, or it must be connected to an elongated magnetizable ground strip. The bending or curvature of such (squeegee) strips as a result of inherent rigidity is not only relatively great in use, but already during manufacture. Rolled or drawn steel profiles are subject to strong tensile forces that are released by machining and / or stress and lead to a considerable curvature of the profile, which is unsuitable for a linear doctor blade pressure over several meters. Therefore, it can be explained that massive doctor blades with elaborate mounts for mechanical pressure have hardly been replaced in practice by magnetizable coating profiles that can be pressed with magnetic force, if one disregards the use of the magnetically pressed doctor blade in textile stencil printing but has remained limited to relatively small application widths and to relatively small magnetization masses of the doctor blades.

In contrast, the invention has for its object to provide an application device of relatively simple construction, wherein the design, shape and / or choice of the flexurally elastic contact part are to be largely independent of the segments serving for contact pressure and the size of a desired contact pressure can be essentially determined by the choice of the segments; moreover, to the extent largely independent of the size of the selected contact pressure, over large application widths of several meters and for various applications of uniform width, in particular also with very viscous substances, a large amount of bending and tension-free contact of the contact element with the substrate, in particular even with relatively small contact forces.

This object is achieved in connection with the features of the application device mentioned at the outset in that the application device is provided with holding means which are arranged directly on the segments and by means of which the segments are held so as to be movable in the direction of the substrate, the pressure part being attached to at least one over its length is arranged on the side of the substrate path segment. The pressing part can be loaded with weight and / or magnetic force of all segments. The invention is characterized in particular by the fact that, while avoiding the inherent rigidity of conventional elements extending over several meters, a pressing device can be implemented which has the desired, in particular also with a very large, effective mass for the pressing force or with a correspondingly large cross section the application width shows no disadvantageous deformation. The segment-like structure of the pressing device ensures a limp characteristic over the entire application width, ie in the longitudinal direction of the device, with which in particular also in the case of relatively large ones Masses or cross sections an excellent adaptation and conformability of the segmented pressing device is achieved with the pressing part arranged on it and acted upon by it on the contact or support carrying or guiding the substrate. The mass or cross section of the pressing part is relatively small in relation to the corresponding dimensions of the pressing device. The contact part is made of flexible material which, even when subjected to relatively small contact forces, nestles against the substrate base / system. A particular and very important advantage is that the pressing part in the form of a bar with a low cross-section, a coating blade or a thin coating rod with any desired coating profile can be produced without tension and is arranged on the pressing device. There is also an extremely important advantage that the contact part is interchangeable and / or after a contact / squeegee edge has worn, it can be machined tension-free, for example by a suitable regrinding. Suitable pressure / doctor profiles are not only those made of flexible, flexible metallic material, but also, for example, those made of plastic, glass, ceramic material or a material component of such materials. Overall, a wide / cross-flexible application device is achieved in the length of the device, which ensures extremely satisfactory application results for a large range of contact forces and in particular for already relatively small contact forces, even for large application widths. The application device, in combination of the parts comprising it, has an extremely adaptable or, in the desired manner, material-elastic characteristic over the working width, its bending resistance being relatively low in comparison to the contact forces. Ie that cross sections of the pressing part and pressing device, the total elasticity module in the longitudinal direction and the working width are coordinated particularly favorably. This eliminates the intrinsic rigidity of the elements.

The invention is of particular importance when the segments are designed in the form of magnetizable parts or in the form of permanent and / or electric magnets which can be detected by means of magnetic force from a magnetic or magnetizable counter body arranged on the substrate path. Due to the design of the application device according to the invention, the dependencies of the contact pressure on a possibly magnetisable mass of the squeegee, on material stiffness and / or on the distance between magnetic force-generating and magnetisable device parts are eliminated in comparison to conventional squeegee devices, so that an extremely energy-saving method of operation also takes place . The segmentation also ensures that magnetic devices can be used in devices with relatively large application widths and for a wide variety of applications using all the advantages of magnetic pressure.

A special embodiment of the invention consists in that the segments are arranged one above the other or layered in the direction transverse to the application width and that at least one pressing part is arranged on the segment lying to the side of the substrate path. The segments are designed, in particular, as thin, resiliently flexible rods lying one on top of the other in the longitudinal direction of the device, the number of which is provided according to the maximum desired contact pressure. Because of the wide, lamellar rod stratification, the pressing device has the desired bending slackness or elasticity in the longitudinal direction.

According to a further embodiment of the invention Segments arranged side by side along the application width. There is a gap between adjacent segments in the longitudinal direction, so that each segment forms a relatively short unit, by means of which the bending-elastic contact part is subjected to contact pressure. It is particularly advantageous to hold each segment in a bearing in which it is at least slightly movable transversely to the substrate path and possibly also along the substrate path. Such storage is designed in a very simple manner by means of a swivel bearing and / or a clearance fit for the segment, the swivel bearing or clearance fit being arranged both on the pressing part and on a holder for the pressing part which can be pivotably articulated can.

In a particular embodiment of the invention, the segmentation in the longitudinal direction of the device consists in that the segments are provided along an integrally formed profile strip, the profile strip being provided with notches or slots in a comb-like manner. The notch or slot-free web profile carrying the segments forms on the side of the pressing device facing the substrate path a relatively thin rod-like or plate-like flexurally elastic part which extends over the application width. A flexurally elastic pressing part can rest against this, or the latter can also be at least partially firmly connected to the web. Yet another embodiment consists of designing the web profile itself as a flexurally elastic pressing or doctor part over the application width.

The segments lined up next to one another in the longitudinal direction of the device can also very expediently be provided as a one-piece body. There is a special one Embodiment of the invention in that each segment body is arranged so as to be movable with respect to the latter, with a loose contact or abutment on or in the form of a press-on profile. The segments are held against the coating profile with a pivot bearing arranged on the coating profile or on a coating profile holder and / or with a clearance fit rattle bearing.

Between the segment or segments lying on the side of the substrate path and the pressing part, a strip which is flexible over the application width can expediently be arranged, which together with the pressing part forms a combination component which is elastic and conformable over the longitudinal direction of the device.

A pressing part that is flexible and flexible over the application width in the form of e.g. a blade and round profile doctor blade can be very easily connected to a pre or metering doctor blade, which is also flexible over the application width, whereby doctor blade and pre / metering doctor blade can be provided in one piece or in two parts. In any case, you get a flexible working, pre / metering doctor blade and doctor blade combined working element over the job width, which guarantees uniform application results due to its flexible and supple properties.

For the embodiments of the invention with a fixed system of respective segments on the pressing part, this or a flexible intermediate strip and / or a flexible pre-metering doctor blade strip can be very easily connected to the respective segments by means of a clamp, tongue / groove, plug or screw connection be.

The pressing device according to the invention, which is built with segments, is universal in machines for the most varied Types of application or can be used for different printing press types. In particular, it should be mentioned that the pressing device is particularly well suited not only for machines with horizontal, but also for those with downward and / or upward guided substrate webs in a version with magnetic pressure. It can be used to carry out stencil-free applications and stencil applications as required. Also particularly advantageous is the combination of two pressing devices according to the invention in one application device for application on both sides of a substrate web, the application process being able to be carried out by doctoring or wiping with a doctor.

A particularly expedient application device according to the invention is characterized in that the pressing device comprises segments lined up in the longitudinal direction (application width), these being designed as independent, relatively short-length bodies of a magnetic bar and each being pivotally mounted. The application device further comprises a magnetizable contact or support, such as a steel table or a steel roller, against which the segmented magnetic bar forming the pressing device can be moved element by element, so that the pressing part or the pressing parts can be brought into contact with it.

A special embodiment consists in providing in the direction of extension of the segment magnetic bar a recess formed by pressing parts which extend in parallel and which forms a gap for an air knife which engages therein and is arranged on the magnetizable counter body.

Application devices according to the invention with the same, constructed and constructed in mirror image to the substrate path Pressure devices result in application devices which are very simple to construct and carry out applications on both sides.

Fig. 1 bis 3

in perspektivischer Ansicht erfindungsgemäße Auftragungsvorrichtungen mit entlang der Auftragungsbreite nebeneinandergereiht angeordneten Segmenten,

Fig. 4 u. 5

jeweils einen Schnitt in einer Ebene zwischen in Auftragungsbreite benachbarten Segmenten erfindungsgemäßer Auftragungsvorrichtungen,

Fig. 6

in perspektivischer Ansicht eine erfindungsgemäße Auftragungsvorrichtung mit in Richtung quer zur Auftragungsbreite übereinandergeschichtet angeordneten Segmenten,

Fig. 7 bis 9

jeweils im Schnitt die Lagerung von einzelnen, in Auftragungsbreite nebeneinander angeordneten Segmenten erfindungsgemäßer Auftragungsvorrichtungen,

Fig. 10 u. 11

in perspektivischer Ansicht bzw. im Querschnitt erfindungsgemäße Auftragungsvorrichtungen mit segmentierter Elektromagnet-Anpreßvorrichtung,

Fig. 12 u. 13

jeweils im Schnitt in einer Ebene zwischen in Auftragungsbreite benachbarten Segmenten Anordnungen einer - jeweiligen Anpreßvorrichtung mit verschieden ausgebildeten Anpreßteilen in erfindungsgemäßen Auftragungsvorrichtungen,

Fig. 14 bis 16

im Querschnitt erfindungsgemäße Auftragungsvorrichtungen mit zum Substratweg wechselseitig angeordneten Segment-Anpreßvorrichtungen und

Fig. 17

im Querschnitt eine erfindungsgemäße Auftragungsvorrichtung mit lose an einer Blatt-Streichrakel angeordnetem Segmenten.

Further expediencies, embodiments and exemplary embodiments of the invention emerge from the subclaims and from the schematic drawing described below. Show it

1 to 3

application devices according to the invention in a perspective view with segments arranged along the application width,

Fig. 4 u. 5

in each case a section in a plane between segments of application devices according to the invention which are adjacent in terms of application width,

Fig. 6

a perspective view of an application device according to the invention with segments arranged one above the other in the direction transverse to the application width,

7 to 9

in each case, on average, the storage of individual segments of application devices according to the invention arranged next to one another in the application width,

Fig. 10 u. 11

in perspective view or in cross-section application devices according to the invention with segmented electromagnetic pressure device,

Fig. 12 u. 13

Arrays of a respective pressing device with differently designed pressing parts in the application devices according to the invention, in each case on average in a plane between segments adjacent in application width,

14 to 16

in cross section application devices according to the invention with segment pressure devices and arranged alternately to the substrate path

Fig. 17

in cross section an application device according to the invention with segments loosely arranged on a sheet doctor blade.

In the drawing, only the essential parts of an application or pressing device 1 or 2 according to the invention are shown. Each pressing device 2 is designed with segments 20 and can be arranged on a substrate path 62, in which a substrate, such as a web 63 to be printed, lies or is guided, possibly using a printing blanket. Each arranged on one or more segments 25 or 21 to 24 assigned to the substrate path 62, the pressing part 3, which is designed in the form of a flexible (flexible-elastic) squeegee extending over the application width 61, is provided to one between itself and the substrate web Form doctor blade or application gap. A template, for example a circular template 66, as indicated in FIGS. 9, 15 and 17, can be provided between the pressing part 3 and the substrate 63, the pattern of which, in the direction of travel 65, means that located in front of a respective pressing line Substance 67 is applied to a web 62. The exemplary embodiments relate to application devices 1 with pressing devices 2, which press the respective pressing part 3 (doctor blade) under the action of magnetic force against the respective substrate 63 or against a counter body 5 guiding it. It is readily apparent that, for example, in application devices 1 with horizontally guided substrate webs and with pressing devices 2 arranged above them, the segments 20 can be designed as mass elements which can be attracted by gravity.

A device 1 according to FIG. 1 comprises a multi-part pressing device 2 which is divided over the application width 61 into one-piece bodies 21 to 24 forming segments 20. Gap spaces or surfaces 204 lie between adjacent segment bodies (e.g. 21, 22). A doctor blade 32 forming the pressing part 3 is designed in the form of a thin, flexible rod and extends continuously over the application width 61 of the device. The doctor blade 32 is used as a spring element in grooves 38 on the sides of the segment bodies 21 to 24 facing the substrate path 62.

Segment bodies 21 to 24 in Fig. 2 consist of magnetizable material, so that they can be magnetically attracted to this by means of a magnetic bar 5. It can be seen that the volume, the effective magnetic mass or the cross section of each individual body determines the maximum size of the magnetic attraction. Although the magnetic mass can be relatively large over the application width 61, the pressing device 2 is designed to be flexible due to its limb-like structuring and conformable in its length. - The volume or the cross section of the doctor blades 32 have only a fraction of the corresponding Sizes of the segment bodies 21 to 24. It is thereby achieved that the application device 1 consisting of the pressing device 2 and the doctor blade 32 is designed to be flexible and conformable over the application width 61. The pressing part 3 can have the most varied doctor blade profiles, and it can be produced as a rod-shaped thin part relatively easily and without tension. Such profiles are also very easy to grind or re-grind.

The segmentation of the pressing device 2 explained with FIG. 1 with relatively large masses which bring about the pressing in combination with the pressing part 3 which is continuous over the application width 61 and which is of relatively small cross-section and is flexible for the purpose of conformability, is also an essential feature of the following described embodiments of the invention.

In the exemplary embodiment according to FIG. 2, segments 21 to 24 arranged next to one another over the application width are formed as parts of a one-piece profile strip 201. The segments 21 to 24 are formed by comb-like incisions, recesses or slots 202, wherein they are held in one piece on a web profile 203. The cross section of the web profile 203 is small in relation to the cross sections of the segments 21 to 24. On the web 203 there is also formed a pressing edge 32 forming the pressing part 3. The profile strip 201 consists at least partially of magnetizable material, so that it can be magnetically detected by a magnetic bar 51 extending in the application width.

5, a profile strip 201 having segments 20 is formed with a flexible web 203, on which a flexible circular doctor blade 31 is arranged, for example by means of a plug connection.

Both in the case of a one-piece profile strip 201 with web 203 and also in the case of a multi-piece pressing device 2, the pressing part 3, which e.g. can be profiled in a round or wedge shape with formation of a doctor blade edge, can be connected to the individual segments 20 by means of screw or plug connection 371 or 372. Such arrangements of the pressing part 3 are shown by way of example in FIGS. 3 and 4.

As not shown in FIGS. 1 to 3 and 5, the application device 1 comprises a holder in which the pressing device 2 comprising the segments 20 is held movable in the direction perpendicular to a counter body 5. It is particularly expedient to suspend the segments 21 to 24 in an oscillating manner, or to provide a pivot linkage by means of a pivot arm 42 which is fixedly arranged on a segment 20, as shown in FIG. 4.

As shown in FIG. 6, a special design of the pressing device 2 according to the invention consists in that segments 25 to 28 forming a pressing device 2 are arranged one above the other in the direction transverse to the application width 61. The segments 25 to 28 forming the stratification consist of relatively thin strips which are flexible in the longitudinal direction of the device. They can be connected to one another at the end by chain elements such as pins. A pressing part 3 in the form of a circular doctor blade 32 is arranged on the segment 25 lying to the side of the substrate path 62, it being held at least at the end by means of a plug connection. The segments 25 to 28 lying along one another over their length can be moved in a cage-like frame 29 transversely to the substrate web 63 or to a magnetic bar 51 forming the counter system 5 held. It is particularly advantageous to mount the frame 29 within the application device so as to be pivotable about an axis parallel to its longitudinal axis in order to bring the circular doctor blade 32 into contact along different contact lines. For this purpose, a swivel arm 290 is provided on the frame 29 in the center of the application width. With a ball joint 291 on the arm 290 it is also achieved that the pressing device 2 with the squeegee 3 can be tilted out of a longitudinal position parallel to the substrate web 63, so that adaptation to possibly slightly inclined webs over the application width is very easy to accomplish. Instead of the storage with frame 29, a blind-like arrangement and suspension of the segments 25 to 28 can also be provided.

In application devices 1 according to the invention with plate-shaped or leaf-shaped flexible doctor blades 32 as pressing parts 3, it is particularly advantageous to design segments 20 arranged next to one another over the application width as one-piece bodies and to arrange them loosely and movably with respect to the doctor blade 32. Such exemplary embodiments according to the invention are shown in FIGS. 7 to 9.

According to FIG. 7, each segment 20 is held so that it can be pivoted about an axis parallel to the longitudinal axis of the device 1 by means of a swivel arm 41 arranged on the swivel arm 42. The pivot bearing 41 is arranged on a holding part 40 for the doctor blade 32. The holding part 40 is articulated on a holder 4 of the device via a swivel holder in the form of a hinge bearing 46. In this way it is achieved that the angle of attack of the doctor blade 32 relative to the web 63 can be changed due to the height adjustment of the holder 4. This is accomplished by means of a swivel bearing 11 of the application device 1 which hinges the holder 4.

In the described embodiment, it is also possible to arrange each pivot bearing 41 of a segment 20 directly on the holder 4, as shown in dashed lines in FIG. 7. The swivel arm 42 can be connected to the segment 20 by means of a clearance fit 47.

In a further embodiment, the pivot bearing 41 according to FIG. 7 can be replaced by a pin bearing 43, with which the segment 20 is movably held against an axial head 48 in the play or rattle seat via a pin 44 connected to it.

FIG. 9 shows a further mounting of pressure elements 20 independently of the mounting of a sheet doctor blade 32. The doctor blade 32 is held elastically on the holder 4, which is provided in the area of the doctor blade with a clearance 45 which is arranged on the side facing away from the substrate path 62. The clearance fit 45 holds each segment 20 transversely and freely abuts the squeegee 32.

7 to 9, the mobility of the individual elements is shown by arrows.

10 shows an exemplary embodiment of the invention for a pressing device 2, which is divided over the application width 61 into segments 21 to 24 forming electromagnets.

The pressing device 2 is thus designed as a magnetic bar segmented over the application width 61. On the sides of the magnetic beam pieces 21 to 24 facing the substrate path 62, a circular doctor blade 31 is arranged, for example by means of a continuous flexible profile 33, which can also be provided as a freely movable roller doctor blade in the receptacle of the profile. The segmented magnetic bar pressing device 2 extends along a roller 52 which forms the application counter-system 5 and is made of magnetizable material. It can be seen that the pressing device with the piece-shaped magnetic bodies arranged in series can be retrofitted in a technically and economically very advantageous manner in existing systems comprising steel rollers, for example in paper or cardboard production, for finishing such substrates.

A segmented magnetic bar pressing device according to the invention is in no way limited to horizontally guided substrates 63. Thus, pivotably suspended or held magnetic bar pieces can be arranged as segments 20 according to FIG. 11 with individual transverse mobility against a substrate web 62 guided vertically on a roller 52. In Fig. 11, the radius of the roller 52 is provided so large that the roller has a doctor blade function with a pointed-wedge-shaped substance space 64 against the substrate web 63. The substrate web 63 can therefore also be coated on both sides. A circular or roller doctor blade 3 is arranged in a recess in a pressure-elastic strip 392 arranged on the segments 20.

As shown in FIGS. 12 and 13, a blade or round profile of a pressing part 3 can be easily combined with a groove 38 extending over the application width by means of a groove 38 arranged on the side of the substrate path 62 on segments 20 or on their connecting web 203 flexible bar 39 can be arranged by clamping connection. According to FIG. 12, a doctor blade 32 is formed in one piece with a pre-doctor or metering profile 34, which extends elastically over the application width, to form a substance storage space 64.

13 shows a circular doctor blade 31 arranged by means of tongue and groove clamping on a groove 38, a flexible wall part of the groove 38 being designed as a pre-doctoring / metering profile 34 which extends over the application width.

According to FIGS. 12 and 13, the counter abutment bodies 5 of the application device 1 are provided as magnetic bars 51 which extend over the application width. The segments 20 of the pressing device 2 can be designed as magnetizable bodies or as permanent or electric magnets, the latter being arranged with opposite poles relative to the magnetic bar 51. 12 and 13 work against vertically guided substrate webs 63.

14 shows an application device 1 with a pressing device 2 arranged on each side of a substrate path 62 for applying substance 67 to a substrate web 63 on both sides. The pressing devices 2 are arranged and formed symmetrically with respect to the substrate path 62 or with the substrate web 63. Press-on parts 3 designed as sheet-shaped doctor blades 32 form a pointed-wedge-shaped substance space through which the substrate web 63 is guided in the center. The doctor blades 32 can be moved in the direction of the substrate web 63 by means of the mutually arranged pressing devices 2 loosely abutting them, the pressing devices 2 being each slidably mounted in a holding part 40 having a clearance fit 45. The storage corresponds to that of the exemplary embodiment according to FIG. 9.

Each pressing device 2 comprises a row of segments 20 arranged over the application width, which are each provided as permanent magnets. The magnetic The polarity of mutually opposite permanent magnet segments on the substrate path 62 is provided such that they magnetically attract one another. In a special embodiment, electromagnet segments are arranged instead of permanent magnet segments. According to a further exemplary embodiment, a pair of mutually attracting segments 20 can comprise a magnet on one side of the substrate path 62 and a body made of magnetizable, magnetically attractable material on the other side. In the application device 1 according to FIG. 14, the squeegee holders 4 are arranged independently and separately from the holding parts 40 for the segments 20.

An application device 1 according to FIG. 15, like the device described with reference to FIG. 14, comprises two pressing devices 2 arranged alternately on a substrate path 62, each with segments 20, which lie loosely on sheet doctor blades 32 and form magnetic segment-pressing pairs. 15, doctor blade 32 and clearance fit 45 are each provided on a common holder 4, which can be pivoted about an axis parallel to the longitudinal direction of the device 1 by means of a bearing 11. The segmented pressing device 2 with doctor blade 3 and holder 4 can each be arranged within a circular template 66.

16, like the exemplary embodiment according to FIG. 11, comprises on the one side of the substrate path 62 a pressing device 2 with electromagnet segments 20 arranged alongside one another along the width of the application, each of which is articulated by an arm 42 or a pivot bearing 41. On the other side of the substrate path 62, a pressing device 2 according to the invention is also provided, which comprises segments 20 arranged next to one another over the application width, each of which is made of magnetizable Material or consist of a permanent magnet. Each of these segments 20 can be held, for example, by means of an arm 42 in the direction 65 of the substrate path 62 and / or movable transversely thereto.

The application device 1 according to FIG. 16 comprises an air knife arrangement provided on the substrate path 62. Along the application width, two continuous flexible pressure parts 36 are arranged on one, namely the segmented electromagnet pressing device 2, which leave a recess 35 between them. An air knife 30 with a pointed or round working edge engages in this. The air knife 30 is arranged as a flexurally elastic pressing part 3 extending over the application width on the other segmented pressing device 2. In FIG. 16, according to further embodiments, one of the two pressing devices 2 can also be replaced by a magnetizable counter body 5, which then has a doctor blade recess or doctor blade designed in accordance with FIG. 16.

According to FIG. 17, an application device 1 comprises a pressing device 2, optionally arranged in a circular template 66, with segments 20 arranged next to one another in the application width. As in the exemplary embodiment according to FIG. 9, these are held and lie in a clearance fit 45 in the direction of the substrate path 62 loosely on a sheet-doctor blade 32 forming the pressing part 3. These and the clearance fit 45 are arranged on a common holder 4 which is held so as to be pivotable about an axis parallel to the longitudinal direction of the device 1 by means of a holder 11. On the other side of the substrate path 62, a pressure surface of a counter body 5 is provided which extends across the application width and against which the doctor blade 32 acts between the counter body 5 under the action of magnetic force and the segments 20 operates. In particular, the segments 20 are each designed as permanent magnets, while the counter body consists of magnetizable material. This can optionally be articulated via a holder 53 in the direction of the substrate path 62 and / or movable transversely thereto.

Claims (27)

1. Apparatus (1) for the application of material (67) such as optionally foamable substances of differing viscosity, coating substances, varnishes, adhesives, pastes, etc. to a substrate (63) such as a material web with a pressing part (3) over the length of the apparatus (application width) and being constructed in bending elastic manner for engaging in a substrate path and with pressing means, the pressing means being arranged on the pressing part (3) and subdivided over the length of the application apparatus (1) into segments (20) which form a pressing device (2) and are lined up in link-like manner, and the pressing part (3) being subject to a pressing force determined by the body mass of all the segments, characterized in that the application apparatus (1) is provided with holding means (29, 4, 40-48) which are directly arranged on the segments (20) and by which the segments (20) are held movable toward the substrate (63).
2. Apparatus according to claim 1, characterized in that the link-like segments (20) of the pressing device (2) are in the form of mass parts constituting weights.
3. Apparatus according to claims 1 or 2, characterized in that the link-like segments (20) of the pressing device (2) are constructed as magnetizable parts, permanent magnets and/or electromagnets, which can be detected by means of magnetic force by a magnetic or magnetizable countermember (5) located on the substrate path (62).
4. Apparatus according to one of the claims 1 to 3, characterized in that a bending elastic and/or pressure elastic strip (39) is arranged between the segment (20) and the pressing part (3).
5. Apparatus according to one of the claims 1 to 4, characterized in that the pressing part (3) is constructed as a rod-like profile doctor, such as a round doctor (31) or a doctor knife (32).
6. Apparatus according to claim 5, characterized in that the doctor (31, 32) together with a profile surface (34) used for predoctoring purposes is arranged on the segment or the segments (20) located on the side of the substrate path (62).
7. Apparatus according to one of the claims 1 to 6, characterized in that the pressing part (3) is constructed as a magnetizable roll doctor, which is freely rotatably held in at least one recess provided on at least one segment (20) or on a bending/pressure elastic strip (39).
8. Apparatus according to one of the claims 1 to 4, characterized in that a recess (35) is provided on at least one segment (20) along the application width (61) and its edges form two through parallel pressing parts (36).
9. Apparatus according to one of the claims 1 to 8, characterized in that the segments (25 to 28) are superimposed transversely to the application width (61) and that at least one pressing part (3) is arranged on the segment (25) towards the side of the substrate path (62).
10. Apparatus according to claim 9, characterized in that the pressing device (2) comprises a cage or frame (29) in which the segments (25 to 28) are movably arranged.
11. Apparatus according to claim 10, characterized in that a swivel bearing (290) is arranged in the centre of the application width (61) on the frame (29).
12. Apparatus according to one of the claims 1 to 8, characterized in that the segments (21 to 24) are juxtaposed along the application width (61).
13. Apparatus according to claim 12, characterized in that the application apparatus (1) comprises a holder (4) on which each segment (21 to 24) is articulated so as to be movable transversely to the application width (61).
14. Apparatus according to claim 13, characterized in that the holder (4) comprises a swivel bearing (41) with which the segment (21 to 24) is articulated by means of a swivel arm (42).
15. Apparatus according to claim 13, characterized in that the holder (4) comprises a pivot bearing (43) with which the segment (21 to 24) is articulated in loose or clearance fit by means of a pivot (44) arranged on the segment.
16. Apparatus according to one of the claims 13 to 15, characterized in that the holder (4) comprises a clearance fit (45) in which the segment (21 to 24) is movably held.
17. Apparatus according to one of the claims 12 to 16, characterized in that the segments (21 to 24) are provided along a one-piece profile strip (201), the latter being provided in comb-like manner with notches or slots (202).
18. Apparatus according to claim 17, characterized in that the notch or slot-free, segment-carrying web profile (203) forms the through bending elastic pressing part (3).
19. Apparatus according to one of the claims 12 to 16, characterized in that each segment (20) is constructed as a one-piece body.
20. Apparatus according to claims 1 to 19, characterized in that the pressing part (3) is connected to the segment bodies (20), optionally via a bending elastic strip (39), by a clamping, plug-in or screw connection (37).
21. Apparatus according to claim 19, characterized in that the pressing part (3) is constructed as a through (undivided) coating doctor (32) over the application width (61) and that each segment body (20) rests loosely on the coating doctor and is movable with respect thereto.
22. Apparatus according to claim 19, characterized in that the application apparatus (1) comprises a swivel bearing (46) articulating the coating doctor (32).
23. Apparatus according to claims 21 or 22, characterized in that each segment body (20) is so provided with a recess that the free doctor end is movable into the recess.
24. Apparatus according to one of the claims 1 to 23, characterized in that the application apparatus (1) comprises at least one bearing (11, 41) displaceably and/or pivotably articulating a holder (4, 40) for the segments (20) and/or for the pressing part (3).
25. Apparatus according to claim 3, characterized in that it comprises a magnetic beam (51) forming a countermember (5).
26. Apparatus according to claim 3, characterized in that it comprises a rotary or fixed roller (52) of magnetizable material forming a countermember (5) and that the segments (20) are constructed as permanent magnets and/or electromagnets.
27. Apparatus according to claim 3, characterized in that on either side of the substrate path (62) it comprises the pressing device (2), and the two pressing parts on alternately facing, magnetically acting segments (20) are movable transversely to the substrate path (62) and towards one another in the case of mutual magnetic detection of the alternately provided segments.

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