EP0423274A1

EP0423274A1 - Doctor blade for applying free-flowing or powdered substances on flat surfaces.

Info

Publication number: EP0423274A1
Application number: EP90906046A
Authority: EP
Inventors: Johannes Zimmer
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-04-18
Filing date: 1990-04-17
Publication date: 1991-04-24
Anticipated expiration: 2010-04-17
Also published as: ATE96734T1; DE59003336D1; EP0423274B1; AU5442590A; JPH03502909A; AT399832B; ATA92489A; WO1990012687A1; BR9006721A

Abstract

Doctor blade device for applying or for spreading or smoothing suitable free-flowing or powdered substances on flat surfaces (15), webs or the like, in connection with or without the use of templates (16), preferably in connection with magnetically generated pressure of a doctor blade. A doctor blade or a profiled rod (9) which supports or, if necessary, touches or loosely surrounds the doctor blade, are adjusted parallel to the plane of the application surface or of the template (16) or the like by an auxiliary device incorporated in the doctor blade device (12). The profiled rod consists essentially of at least one, at least approximately centrally arranged pivot joint or rotary disk joint or possibly spherical joint (5) or, in the case of very long devices, it consists, if necessary, of two or more rotary disk joints or the like arranged symmetrically or approximately symmetrically along the length of the doctor blade element (12, 121). The doctor blade element or the profiled rod (9) which supports, touches or surrounds the doctor blade is connected to the doctor blade device by said joints and is secured so as to rotate and slide with the doctor blade device.

Description

Squeegee device for applying flowable or powdery substances to flat, flat surfaces.

The subject of this invention is a doctor device or doctor element for applying or for spreading or spreading flowable or powdery substances onto flat surfaces, webs or the like. in connection with or without the use of stencils, preferably in connection with magnetically effected squeegee pressure.

The squeegee device presented here is equipped with a squeegee element, which consists of a roller, a profile bar, a professional bar, an elastically deformable squeegee blade or the like. can exist. It can also be a squeegee application element (squeegee).

The length of the doctor device or doctor element usually extends transversely to the direction of movement or running of the web or the like. and, depending on their width, can be less than one or even several meters.

There are several prerequisites for the smooth functioning of such a doctor device. One of these prerequisites - and one of particular importance - is the plane-parallel contact of the doctor element or, in particular, of the contact area with the surface or template to be scraped or scraped off.

This requires precise parallel adjustment of the squeegee holders. The larger the web width or application width or length of the doctor blade is the more difficult is the exact parallel adjustment of the doctor device or the doctor element to the application surface or to the stencil, because with increasing working width or device length also its physically induced deflection and also due to the constant handling stress during on - and removal and bending risk due to cleaning increases.

This is generally known in the art of manufacturing and using doctor blades. Many efforts have already been made and a great deal of inventive work has already been done in order to be able to master this difficulty, which, however, has only ever been achieved to date.

One of the most remarkable squeegee devices or squeegee elements is the roll squeegee, which is made of steel or another magnetizable material and is pressed on by magnetic force; This is mainly because this squeegee element does not require any mechanical mounting, fastening or clamping, but only loosely placed or inserted and then magnetically pressed and held or rolled in the magnetic field.

However, if such a doctor blade element is used with another element - such as e.g. with a professional bar - connected and used in order to achieve certain application results that cannot be achieved with the roller doctor element alone, the same problem arises here, which has already been described in the introduction.

This problem also arises with all other previously known magnetically pressed doctor devices or doctor elements, e.g. Doctor squeegees of all kinds that require mechanical mounting or fastening, since they cannot assume and hold their working position independently or without attachment, like a simple roller doctor blade.

To differentiate the subject of the invention from the known state of the art nik is the closest to CH-PS 464967 (Peter Zimmer). It describes a doctor blade device which can be pressed by means of magnetic force, which is characterized in that the blade holder or its carrier is freely movable transversely to the work surface. Although this construction avoids the risk of unequal height adjustment of the squeegee device by means of otherwise generally customary, height-fixed mounts on the squeegee device ends or at the ends of the squeegee device carrier, the risk of bending of the squeegee device is not eliminated thereby. On the contrary: with devices that are designed in this way, the risk of bending, even due to the manufacturing process, is very high.

Compared to other devices that work magnetically, squeegee-pressed, this device has a disadvantage that impairs its function: the squeegee contact pressure is so great due to the weight of the squeegee device that the magnetic contact pressure can only be used as a reinforcing force and that the adjustment or Applying only a small doctor pressure is therefore not possible.

Devices of this type have therefore not found their way into practice. Squeegee devices which consist of a support, spar, tube or the like which is constructed to be as rigid as possible are still as before. exist and which are mounted at the ends, on both sides of the application surface or web or the like, fixed in height or attached to the machine frame, in practice the most widespread.

The second type, which is widespread in practice, is the magnetically pressed roll doctor devices described above, or, more correctly, roll doctor elements. Roll akelele ene because the magnetically pressed squeegee rollers are usually only loosely inserted or laid on and held magnetically.

The object of the invention presented herewith is to provide a doctor blade device which is mounted in a height-fixed manner or fixed to the machine frame in accordance with the conventional prior art with the ends of the doctor blade carrier construction, the doctor blade spar, the doctor blade tube or the like. that, however, with regard to its working function, the doctor element attached to this doctor device carrier is advantageously designed - compared to the previously known prior art - so that the bending stiffness of the tool carrier construction cannot be transferred to the doctor element and the doctor element, door acting alone, unimpeded by the inherent rigidity of the squeegee device, parallel to the surface and allowing the working edge or contact surface of the squeegee element or, if appropriate, including a squeegee element retaining strip, to lie evenly over the entire application width or squeegee element length.

The object of this invention is essentially characterized by an auxiliary device integrated in the doctor device constructed according to the invention for the plane-parallel adjustment of the doctor element or a profile bar holding the doctor element or possibly only touching or loosely encompassing the application surface or the template or the like. , which essentially consist of at least one, at least approximately centrally arranged rotary joint or rotary slide joint or, if appropriate, spherical joint, or, if the length of the device is very large, two or more, or the like, symmetrically or approximately symmetrically arranged rotary slide joints or the like over the length of the doctor element . is, through which or by which the doctor element or the doctor element carrying, possibly only touching, extensive, etc. profile bar is connected to the doctor device against which it is mounted such that it can rotate or move.

The subject matter of the invention is illustrated in a few exemplary embodiments and described below, of course without being limited to these exemplary embodiments and without being restricted to their description.

After all, these four exemplary embodiments already make it clear that the subject matter of the invention offers versatile applicability and a number of design options for different types of application or for different types and shapes of doctor elements.

The construction examples shown in FIGS. 1 and 2 each show a complete cross section through a doctor device 1 designed according to the invention. The reference numeral 2 designates a preferably rigid bending-shaped squeegee cross member, support beam, support tube or the like. If tubular, this support beam or the like can. can also be used for substance delivery, which is indicated in the drawing in FIGS. 1 and 2.

This support beam, designated 2, is - which is not shown in the drawing, but is easily imaginable - attached to its two ends, if at all, in a vertically movable manner. This support beam 2 can also be thought of as being position-changeable in any other spatial direction depending on the requirement, but usually there is no change in position during a respective operating state. Changes in location are only carried out for the purpose of handling, installation and removal or cleaning and exchange for other doctor blades, or changes in location to be handled in accordance with the setting are made only for the purpose of setting or changing the setting of application parameters. The spatial arrangement of the doctor device can be done as desired.

Doctor devices constructed in accordance with the invention are therefore not conceivably arranged in a free-standing manner, but, in addition to being in contact with the work surface, application surface, stencil, magnetic bar, magnetic roller or the like, need a location fixation of the support beam, cross member or the like. 2, it being possible in an advantageous, additionally characterizing embodiment according to the invention to change the position of the cross member or the like. 2 to derive changes in the application parameters by causing changes in the angular position of the doctor element or of the professionals contacting, surrounding or holding the doctor element.

1 and 2, 3 designates a U-shaped support profile which is fastened to the cross beam support member 2 with parts 4, but a one-piece design - ie parts 2, 3 and 4 together a support profile - is also possible. The length of the U-shaped support profile part 3 is shorter than the cross member support beam 2, can correspond to the application width in order to increase the transverse rigidity of the cross member 2, but can also be arbitrarily shorter, for example only as a fork piece, or can can also be divided into two or more pieces, arranged and fastened in the area of the working width.

In the part labeled 3 or in at least one such part 3 there is - preferably in the middle of the application area - at least one rotary or rotary sliding joint or the like labeled 5. used, whose axis is designated 6. The part 7 is designated by the part which is hooked into the part 5 or fastened to it with a rotary or, if necessary, a rotating and sliding seat connection, or thereby also with the parts 3, 4 and 2 being rotatable or rotating and sliding seat movable on the other hand, connected or adhered to.

The part 7 can either be a professional bar or a relatively narrow, preferably centrally arranged swivel arm, or it can be two or more parts which are divided over the working width and have the same cross-section in FIGS. 1 and 2 and are distributed over the working width his; a continuous professional bar is also conceivable, the length of which corresponds approximately to the working width, whereby - analogous to part 5 of the description - it is in turn possible to place this profile bar 7 only once in the middle region on a e.g. To fix swivel 5 or to e.g. two rotary sliding joints which are arranged approximately in the area of the two outer thirds or quarters of the profile strip length 7. It is also conceivable to use a centrally arranged, e.g. Swivel joint 5 to be combined with two swivel and slide joints arranged in the end region.

A simple example of a rotary and sliding joint connection of the type described above is shown in FIG. It can be seen here that the part 7 is provided with a bore which is widened as a longitudinal slot instead of a bore which fits centrally on the swivel joint 5, as a result of which the part 7 in FIG. 3 has an additional relative mobility, indicated by an arrow, with respect to the part 3 obtained. According to a further embodiment of the invention, this embodiment is also suitable for the function of the pivoting or sliding mobility of the profile strip or of the parts or of the part 7 in relation to the doctor device 1.

On the rotating or Kpp or swiveling or sliding on the Part - or at most on the parts - 3 attached profile strip or the above-described holding part or parts (7) is a leg of a hinge joint 8 - it can also be several hinge joints of shorter overall length - attached. 5 On the second leg of this hinge joint or this hinge joint, a profile bar forming or holding the doctor element or touching or possibly encompassing doctor element, profile bar is fastened, the length of which is preferably equal to the working width. 4 shows a variant of this, in which the hinge joint 8 is not designed as a rotary joint hinge, as shown in FIGS. 1 and 2, but rather as a flexible joint or flexible joint strip.

In Figure 4 it is shown that the above-described parts 7, 8 and 9 5 can also be produced as a one-piece profile strip - preferably made of rubber or a high polymer material - the three sub-areas of this multifunctional profile strip, which describe the individual described above Parts 7, 8 and 9 assigned part functions. 0

In FIG. 1, a strip 10 made of one or more parts and made of magnetizable material is attached to the squeegee holding strip 9, by means of which the squeegee element 120 is magnetically pressed. 5

In FIG. 2, the magnetisable profile strip 10 is embedded in the profile strip 9 — in one part or in several parts — and has a smaller cross section than in FIG. 1. This is because, in FIG. 2, a roll made of a magnetizable round profile

30 squeegee element 121 is used, so that in this Fig.2, embodiment variant of a squeegee device according to the invention the magnetizable profile 10 does not have to press on the squeegee elements 121, but only the squeegee element profile strip 9 surrounding this squeegee element, counteracting a susceptible substance back pressure, on the squeegee element

35 121 has to hold tight.

In Fig. 2, in addition to the above-described magnetizable insertion profile bar 10 - which can be possibly also permanent-magnetic design - shown a further magnetizable, but preferably permanentmagne- tf ^'sch formed insertion strip. 11

This magnetizable or permanently magnetic slide-in bar 11 - it can also be slide-in parts of the same cross-section as shown - can be used in addition to strengthening the magnetic contact pressure of the doctor blade element profile 9 to the doctor blade element 121 when the doctor blade device is out of operation and by the contact surface or work surface or template is lifted off, on the surrounding or contact surfaces of the doctor element profile strip 9 closest to the magnetizable parts 11 or at most 10 and / or 11. As a result, this embodiment, shown in FIG. 2, of a doctor unit which is two-part for its function (operating state) is converted into a doctor unit which is one part for the idle state or for handling purposes.

3 shows the subject matter of the invention in connection with a slot-type doctor element consisting of two doctor-element profile strips 122 and 123 which are connected to one another by plug-in connections. In this embodiment variant, the use of the hinge or flexible joint 8 which extends the main subject of the invention was dispensed with, i.e. no such joint is required for this embodiment. Depending on the working width or length of such a device, the device parts 3 and 7 connecting sliding joint or rotating and sliding joint parts 5 according to the invention are either arranged only once in the middle or twice in the end areas or three in the case of very large working widths or overall lengths - arranged up to five times over the entire length to think. Regarding FIG. 4, it should also be said that the magnetizable profile strip 10, which is made in one or more parts, is inserted loosely and accordingly also interchangeably into the doctor element profile strip 9.

For general understanding of all the figures, it should also be said that 13 in FIG. 1 is a fastening gill strip for the squeegee strip 12, the arrow 14 the direction of movement, 15 a conveyor belt with a web lying thereon, 16 in FIGS. 1, 2 and 3 a circular template and 17 and 18 in Fig. 1 to 3 called a so-called magnetic bar.

In FIG. 4, 19 denotes a magnetic roller and 20 denotes the material web to be coated by the doctor device according to the invention.

The arrows denoted by 21 in FIGS. 1, 2 and 4 denote the preferred position-changeable direction for the device setting. In the direction of this arrow, the change in the position of the squeegee device according to the invention in its preferably flexurally stiff with 2 and 3 or possibly also 7 device parts, which are brought about by the end fastenings for the squeegee carrier spar 2, which are not shown in this direction and can be moved, is considered an important one Functional advantage expanding the main idea of the invention, quantity control of the application performance is effected by the change in the angle of the doctor element profile strip or the substance accumulation area located between it and the application surface or template depending on this change in position. This change in the angular position, which is important for the control of the application quantity output, is represented by the arrow 22 in FIG. Of course, the same, as previously explained, also applies to the embodiment variants FIGS. 1 and 4, but not to FIG. 3.

A further, particularly advantageous embodiment, or a functional advantage which extends the main idea of the invention, can be achieved in that it is now possible for the first time by the rotary or sliding joint connection integrated in a doctor device constructed according to the invention in accordance with the main idea of the invention is to manufacture such a squeegee device, the crossmember or supporting beam of which can be constructed to be flexurally stiff - and thus also exposed to the unavoidable dangers of bending and bending - without the doctor element also subjecting these bending or bending risks to the suspension of the disadvantageous consequences arising from this for the application process.

These consequences are the dangers of application irregularities, which are well known in doctor blade technology and are inherent in almost all doctor blade device designs, in particular in the case of larger working widths. The present invention makes it possible to produce any desired cross-sectioned doctor blades, which are suitable for the respective application requirements, independently of the other doctor blade construction parts, either in a manner that is inherently rigid due to their inherent strength, or to a desirable extent with flexible or slackness.

The use of doctor blades manufactured according to the invention enables high-quality application processes in larger working widths and with greater economy than before.

Claims

1. Squeegee device for application or for spreading or brushing on suitable, flowable or pul-like substances on flat surfaces (15) webs or the like. in connection with or without the use of stencils (16), preferably in connection with magnetically effected squeegee pressure

5 solution, characterized by an auxiliary device integrated in the squeegee device (1) constructed according to the invention for the plane-parallel setting of a squeegee element - or a professor (9) holding the squeegee element or possibly only touching it loosely or loosely - to the application surface or to the template (16) or the like, which essentially consists of at least one, at least approximately centrally arranged, rotary joint or rotary slide joint or, if appropriate, spherical joint (5) or. in the case of a very large device length, at most two or more rotary slide joints arranged symmetrically or approximately symmetrically over the length of the doctor element (12, 121).

15 Like., Through which - or through - the doctor element or the doctor element carrying, touching, extensive, etc. strip (9), with the doctor device - against this rotatably or displaceably mounted.

202. Squeegee device according to claim 1, characterized in that in addition to the auxiliary device for plane-parallel adjustment, also a Scharnier¬ joint (8) or the like. integrated into the doctor device (1), which hinge joint (8), due to a change in the position of the doctor device (1) or the doctor device holder, changes the angular position of the doctor

25 kelelementes or the Rakelelementprofilleiste (9) with respect to the order level, template (16) or the like. causes.

3. Squeegee device according to claim 1 and / or 2, characterized in that the transverse or support bar or the like holding the squeegee device. rigid

30 is structured.

4. Doctor device according to one of the preceding claims, characterized gekenn¬ characterized in that the doctor element, or its holding profile or profiles, in its or in its straightness and / or orientation for application. ging surface, template or the like. Independent of the straightness of the cross or support spar of the squeegee device (to a large extent), can be produced on its own.

55. Squeegee device according to one of the preceding claims, characterized gekenn¬ characterized in that the squeegee element or its holding profile or profiles are exchanged ar attached to the squeegee device or is loosely movably attached to it.

106. Squeegee device according to one of the preceding claims, characterized in that the doctor element elements are designed in whole or in part to be magnetizable or have a magnetic effect, or are equipped with such parts which are attached to them, embedded therein, inserted therein or inserted or laid on could be.

15

7. Doctor device according to one of the preceding claims, characterized gekenn¬ characterized in that the doctor element is a doctor blade.

8. Doctor device according to one of the preceding claims, characterized in that the doctor element is a rolling akel.

9. Squeegee device according to one of the preceding claims, characterized gekenn¬ characterized in that the doctor blade element is attached to the doctor blade profile bar interchangeably.

25

10. Doctor device according to one of the preceding claims, characterized gekenn¬ characterized in that the Rakelelementprofi11eiste is formed with a correspondingly shaped squeegee working edge.

3011. Squeegee device according to one of the preceding claims, characterized gekenn¬ characterized in that the Rakelelementprofi11eiste rests on a roller doctor element and together with this, for the purpose of performing the application function, loosely assembled, two-part body, which is a self-contained and at the same time work -

35 functions.

12. Doctor device according to one of the preceding claims, characterized records that the doctor blade element is magnetically held outside of the operating state of or on or in the doctor element profile strip.

5 13. Squeegee device according to one of the preceding claims, characterized gekenn¬ characterized in that the doctor element or the doctor element profile strip consists of high polymer material.

14. Doctor device or doctor element according to claim 2, characterized gekennzeich- net that the hinge joint is designed as a flexure.

15. Squeegee device or squeegee element according to claim 14, characterized gekenn¬ characterized in that the part designed as a flexible joint is integrated into the Rakelele¬ element profile strip or is a component thereof.

15

16. Doctor device or doctor element according to one of the preceding claims, characterized in that the doctor element is designed as a slot doctor.

2017. Doctor device according to claim 16, characterized in that the doctor element formed as a slot doctor consists of two interconnected and interacting doctor element strips.

18. Doctor device or doctor element according to claim 1 and possibly 25 one or more of the preceding claims, characterized gekennzeich¬ net that the doctor device or doctor elements cooperate or cooperate with at least one magnetic force generating device, which may act as a working document or carrier of the web or is designed as an application area.

30

19. Squeegee device according to claim 6, characterized in that the magnetizable or magnetically acting parts can be designed as one-piece profile strips or in pieces or can be arranged in any shape.

35

20. Squeegee device according to claims 2 and 3, characterized in that the change in location of the squeegee device in parallel by the cross or support spar of the squeegee device, preferably by the both ends of this cross or support beam or the like. attacking doctor blade aging, is effected.

21. Squeegee device or squeegee element according to claims 2 and 3, characterized 5 in that the change in position of the squeegee device by the cross or support bar of the squeegee device only on one side, i.e. with a variable inclined position of the parts of the doctor device holding the doctor element, follows.

1022. Squeegee device or squeegee element according to claims 2 and 3, characterized in that the change in position of the squeegee device by the cross or support bar of the squeegee device by one or both sides of a mechanical device, possibly accurately reproducible and automated.

15

23. Akelgerät or doctor element according to one of the preceding claims, characterized in that a Substzzufuhr is integrated in the doctor device.

2024. Squeegee device according to one of the preceding claims, characterized gekenn¬ characterized in that the hinge joint or bending joint, viewed in the direction of movement, is arranged in front of the contact or work area, based on a perpendicular plane to the support area.

2525. Doctor device according to one of the preceding claims, characterized _. , shows that the hinge joint or bending joint, viewed in the direction of movement, is arranged behind the contact or working area, with reference to a plane perpendicular to the support area.

3026. Squeegee device according to one of the preceding claims, characterized gekenn¬ characterized in that the hinge joint or flex joint, viewed in the movement direction _f perpendicular to the Anliege- or operating range, based on a. "Right level Ziirn supporting region is arranged.

3527. Doctor device according to one of the preceding claims, characterized gekenn¬ characterized in that the auxiliary device, seen in the direction of movement, is arranged in front of the application or work area, based on a perpendicular plane to the Aiflagbereich.

28. Squeegee device according to one of the preceding claims, characterized ge indicates that the auxiliary devices, seen in the direction of movement, are arranged above the contact or work area, based on a perpendicular plane to the support area.

29. Squeegee device according to one of the preceding claims, characterized ge indicates that the auxiliary device, seen in the direction of movement, is arranged behind the contact or work area, based on a perpendicular plane to the support area.

30. Squeegee device according to one of the preceding claims, characterized ge indicates that the squeegee device or squeegee element is arranged in a stationary manner and the application surface or the place or the web is moved relative thereto.

31. Squeegee device according to one of the preceding claims, characterized ge indicates that the squeegee device or squeegee element is movably attached and arranged such that its movement or the like is parallel to the application surface or web. he follows.

32. Doctor device according to claim 3, characterized in that the cross member or supporting beam mentioned in claim 3 or the like. is formed in several parts

33. Squeegee device according to claim 3, characterized in that the cross member or supporting beam mentioned in claim 3 or the like. is formed in one piece.

34. Squeegee device according to one of the preceding claims, characterized ge indicates that the squeegee contact pressure comes about through the application of magnetic force or at least one part having a magnetic field and one part that can be agnetized by the magnetic field.

35. Squeegee device according to one of the preceding claims, characterized ge indicates that the squeegee contact force is achieved by weight loading which acts on the squeegee element.