JPH06507576A - Support strips for coating equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field] The present invention relates to a moving material of the type defined generically in claim 1 of the claims. For use with doctor blades of equipment that applies coatings to material webs, especially paper webs or cardboard webs. and a running support strip of the type defined generically in claim 3 of the claims. It relates to a device for applying a coating to a web of material therein.

[Background technology] A coater (roll coater or nozzle) is used to coat a paper web or cardboard web. Apparatus with a coater) are known, by means of which the material to be coated, e.g. paint, is Excessive coating is applied to the web surface. a metering element arranged in connection with the coater; A dosing system with a doctor blade removes the excess until the desired coverage is reached. In this case, the height of the coating amount is determined by the distance of the doctor blade relative to the opposing roller. Adjusted via crimp force. The doctor blade is lower than the tip and comes into contact with The crimping force is applied to the clamped dock by a support strip that Can be changed by shifting and/or pivoting the Turblade foot. Wear.

When coating paper or cardboard webs, the cross-sectional profile of the web may vary depending on production conditions. Inconsistencies occur in the profile and therefore it is necessary to use a doctor brush to obtain a uniform coating. It is necessary to adjust the crimp force of the blade to different values over the entire working width. Become. For this reason, depending on whether the amount of coating in the corresponding area is too much or too little, The support strip, which can be deflected within the limits of the According to German Patent No. 2825907, It has become publicly known.

In addition, German Patent Application No. 3927329 describes Coating equipment of the above type, in which a piezoelectric transducer is used as a regulating element for is listed. In one embodiment, the spring is crimped onto the support strip by a piezoelectric transducer. It is then possible to adjust the drag force of the spring.

As we have found in practice, when the web speed is high, the paint profile must be balanced. The doctor blade is deflected in the desired manner over the entire working width in order to adjust the It is extremely difficult to do so. Drab from a web with an excessive amount of coating material. Since the pressing force on the blade acts in the direction of ai from the opposing roller, the coating amount It is necessary to support the pressing force without making it uneven.

[Structure of the invention] The object of the invention is to improve a supporting strip of the type mentioned at the outset so that high web speeds can be achieved. Even when It is possible to locally vary the pressure of the doctor blade without causing fluctuations. It is configured so that it can be adjusted to the value.

The above problem is solved by the configuration means set forth in claim 1 of the claims. child In the case of On the other hand, the force acting on the doctor blade can be reduced without causing variations in coating amount. It has enough stiffness to absorb.

Another object of the present invention is to improve the coating device of the type mentioned at the beginning so that even a simple structure can be achieved. This means that the pressure force of the doctor blade varies locally over the entire working width. The objective is to enable extremely accurate adjustment.

This problem is solved by the constituent means described in claim]l[3 or claim 4. It is solved.

The device according to claim 3, wherein the spacing of the individual adjustment points is such that the flexibility of the support strip selected to be within such a range as to ensure sensitive adjustment as well as sufficient stability of There is.

Claim 4 describes a particularly advantageous embodiment of the adjusting element, in which the adjusting element The supporting strips are locally deflected differently by the actuators. The adjustment element is , characterized by play-free adjustment of the support strips without significant structural outlays. Particularly advantageous embodiments according to claim 5 provide a coarse adjustment based on the differential screw principle. Fine adjustment becomes possible.

For coarse adjustments made without differential operation, a reproducible reference position can be adjusted and then After connecting the differential action with the reference position mentioned above, position it by fine adjustment. You get the advantage of doing so.

[Brief explanation of the drawing] FIG. 1 shows a longitudinal section through a support strip with an adjusting element according to the invention.

FIG. 2 is a partially sectional perspective view.

[BEST MODE FOR CARRYING OUT THE INVENTION] Next, embodiments of the present invention will be explained in detail based on the drawings.

The coating device converts a material web 2, that is, a paper web or a cardboard web with a width of 8 m or more. It has a driven facing roller l that guides the roller in the opposite direction. The material web l is coated with a coater ( (not shown), the coating material is excessively applied. The excess paint is removed using an elastically deflectable doctor blade as a dosing element. 3 to the desired coverage. Said Doctor Bure The foot of the card 3 can be shifted towards the counter roller 1 and is tensioned in the lamp beam 4. and the side of the doctor blade opposite to the opposing roller l is a doctor blade. At the bottom of the turret blade tip, the bullet is released within the limit formed towards the opposing roller. It is supported by a sexually deflectable support strip 5.

The phase of the clamping beam 4 with respect to the support strip 5 extending over the entire width of the material web The pressing force of the doctor blade 3 against the opposing roller 1 is increased by the opposing shift movement. It is possible to adjust.

The supporting strip 5 is It has a uniform cross section (equal to the axial length of the counter roller 1). doctor The edge of the support strip that abuts the blade 3 is tapered or has a diameter of 1 mm to 1 mm. It is rounded and chamfered with a radius of curvature of 3 mm, for example 2 mm. doctor On the side facing away from the blade 3, the cross section of the support strip 5 is rectangular, and It is fitted into the groove 6 of the holder 7 of the support strip 5 which is open near the doctor blade 3. The supporting strip 5 is supported in the groove so as to be movable in the radial direction relative to the counter roller 1. ing. The height of the support strip 5 measured tangentially to the counter roller l is approximately 20 m. m, the width of the cross-sectional square section of the support strip, measured in the radial direction, is approximately 10 mm.

It is particularly advantageous if the support strip is made of chrome-nickel steel, or For example, carbon IIJl! Manufactured from reinforced plastic and/or with a wear-resistant coating It may have a coating layer.

by guiding the support strip in the groove 6 of the holder 7 against the counter-roller 1. The support strip 5 can be shifted in a substantially radially extending shift plane. become. The line of abutment of the support strip on the doctor blade 3 without harmful reaction forces , measured perpendicular to the shift plane to allow for as fine adjustment as possible. The determined moment of inertia of the support strip 5 is 100 mm' to 5000' mm', particularly preferably from 800 mm4 to 1200 mm', in this example 1000 mm' mm'.

By locally varying the pressure of the doctor blade 3, the desired coating amount can be achieved. In order to adjust the cross-sectional profile, cross-cut support strips 5 are installed laterally across the working width. On the back of the support strip over the entire working width, in order to be able to bend, there are rules Holes are drilled at intervals of 75 mm (in this example, all are 75 mm apart), and inside each hole The ends of the adjustment rods 8 are fixedly screwed to each other. The adjustment rod 8 is It is guided so as to be movable in the axial direction within the hole of the base plate 9 of the holder 7, The base plate has a perpendicular notch at an end close to the doctor blade 3, The notch is a cover screwed to the base plate 9 to form the groove 6. The upper side is covered by a plate 10. protrudes from the hole in the base plate 9 One sleeve 11 is fitted over the end of each 111M rod 8. , the sleeve is supported on the base plate 9 with a collar-like enlargement. vinegar Reeve 11 has at least one special table 10-507576 (4) A disc spring 12 is fitted over the collar-like enlargement on one side. an adjusting nut supported and on the other side screwed onto the end of said adjusting rod 8; It is supported by 13. The adjusting nut 13 has a hole that matches the diameter of the sleeve 11. Therefore, the adjusting nut adjusts the preload of the disc spring 12 by rotation. The disc spring 12, which can be moved through the sleeve 11 in order to Push the adjustment rod 8 away from the opposing roller 1 with the selected preload, and the support strip 5 is pulled in order to reduce the pressure applied to the doctor blade 3. .

Adjust the adjustment rod 8 in the direction of approaching the opposing roller l and in the opposite direction of moving away from it. Adjustment screw with inner bore with internal thread and additional external thread for movement 14 is used, and the adjusting screw is fixed to the base plate 9 with the external thread. It is screwed into the internal thread of the holder 15. Consistent internal thread of the inner hole , another screw 16 is screwed coaxially with the adjustment rod 8, and this screw rotates. is movable with respect to the end of the adjusting rod 8 towards the counter roller l. screw At the end of 16, a disk 17 with a polygonal cross-section, for example a hexagonal cross-section, is fixed. The disc is designed to minimize friction when the screw 16 rotates. The end face of the adjustment rod 8 through a spherical cap fixed at the center of the disc for Crimp. A cover 18 is arranged above the holder 15 so that it can be screwed. In order to seal the adjustment element on the upper side, the disc 1 is removed from the holder 15. 7. It reaches the cover plate 10 via the adjustment nut 13 and disc spring 12. . At the same time, the lower surface of the cover 18 is flatly adapted to the polygonal sides of the disk 17. and when the adjusting screw 14 rotates, the interlocking rotation of the disk 17 and the screw 16 is in retaining contact with the outer surface of the disk to prevent interlocking rotation of the disk. figure 2, each adjustment element has its own screw-releasable cover 18. , thereby allowing cover 18 to be removed for coarse adjustment as detailed below. Based on the zero-actuating screw principle, which makes it possible to rotate the screws 16 together. In order to enable fine adjustment as precisely as possible, the external thread of the adjustment screw 14 is , the male thread of the screw 16 has a smaller lead than the corresponding female thread. hey The screw 16 is somewhat longer than the adjusting screw 14 on which it bears. Therefore, the screw 1 The outer end surface of 6 is aligned with the outer end surface of the adjustment screw 14 to determine the reference point. can be done.

The pre-uniformed curvature of the support strip 5 for equalizing the coating profile of the coating layer is It is adjusted as follows. i.e.: After loosening the screws and removing the cover 18, first tighten the adjustment screw 1 along the adjustment rod 18. 3 is rotated to an axial position where the desired preload 18 is created on the disc spring 12.

In the basic position of the lid, the outer end surface of the screw 16 is aligned with the outer end surface of the adjustment screw 14. Now Ka With the bar 18 removed, turn the adjustment screw 14 until it occupies the reference position. Then, coarse adjustment is performed. In this case, the disk 17 is a disc spring with a spherical cap. The adjusting rod 8 is pressed towards the counter roller 1 against the spring force 12 . hey The screw 16 rotates in conjunction with the adjustment screw 14. That is the spherical surface of disk 17. The friction at the cap is compared to the friction at the common thread with the adjustment screw 14. This is because it is so small that it can be ignored. The desired reference position, which is the starting point for fine adjustment, has been reached. Then, the cover 18 is placed and screwed, and from this point on, the interlocking rotation of the screw 16 is continued. is prevented. *When the adjustment screw 14 is turned further, the associated screw 16 becomes a common screw. The axial position relative to the adjustment screw 14 is changed in relation to the lead of the crest. disc 1 7 is the direction toward or away from the adjustment rod 8 by the lead difference between the inner and outer threads. direction along the adjusting screw 14, thereby positioning each region of the support strip 5 in a It becomes possible to make precise fine adjustments. Disc spring with constant preload adjustment The adjustment of the support strip 5 is carried out by or against the spring force of 12. There is no play in the adjustment mechanism, and if the adjustment direction of the adjustment rod changes, the known adjustment Unlike screws, the flow of force flux does not change.

Furthermore, the reference point selected during the rough adjustment is the outer end surface of the adjusting screw 14 and the outer end surface of the screw 16. This can be easily reproduced by turning the adjustment screw 14 until it is realigned with the outer end surface. can be done. In order to more accurately determine the reference point, the adjustment screw 14 and the screw It is also possible to provide each outer end face with 16 with matching markings.

Table 11 +6-507576 (5) Jゝ\,. 727＼＼( ,l 〉

Claims (7)

[Claims] 1. A device for applying a coating to a moving material web, such as a paper web or a cardboard web. a support strip for a doctor blade, the support strip being in contact with said doctor blade; with rounded or pointed edges and locally different Support strip that can be elastically deflected along its entire length to adjust the crimping force to the value The moment of inertia of the support strip, measured perpendicular to the plane of deflection, is Ix is 100 mm4 to 5000 mm4, particularly preferably 800 mm4 to 12 Support strip for a coating device, characterized in that it is 00 mm4. 2. The edge that contacts the doctor blade has a radius of curvature of 1 mm to 3 mm. 2. The support strip of claim 1, wherein: 3. a counterrotate for guiding the material web (2), such as a paper web or a cardboard web; roller (1), a doctor blade (3) that can be pressed against the opposing roller (1), and Contact the doctor blade (3) below the tip of the doctor blade a deflectable support strip (5) supporting a doctor blade (3); The doctor blade is used to adjust the crimping force to locally different values of the blade (3). The entire working width engages the back side of the support strip (5) on the side remote from the support strip (3). and a plurality of rows of adjusting elements arranged across the moving material. In an apparatus for applying a coating to a web (2), the supporting strip (5) is provided as claimed in claim 1 or 2. configuration, and the adjustment element is 50 mm to 200 mm, especially 70 mm. A coating device characterized in that the coating device has a mutual spacing of 120 mm to 120 mm. 4. a counterrotate for guiding the material web (2), such as a paper web or a cardboard web; roller (1), a doctor blade (3) that can be pressed against the opposing roller (1), and Contact the doctor blade (3) below the tip of the doctor blade a deflectable support strip (5) supporting a doctor blade (3); The doctor blade is used to adjust the crimping force to locally different values of the blade (3). The entire working width engages the back side of the support strip (5) on the side remote from the support strip (3). and a plurality of rows of adjusting elements arranged across the moving material. In an apparatus for applying a coating to a web (2), the adjustment element row comprises: (a) a support strip; It is fixed to the back side of (5) and can be shifted in the axial direction through the holder (7). a guided adjustment rod (8); (b) fitted over said adjustment rod (8) and on one side said holder ( 7) and, on the other side, an adjustment screwed onto the end of said adjustment rod (8). a pressure spring (12) preloaded by a nut (13); (c) the force of the pressing spring (12), which is arranged coaxially with the adjusting rod (8); an adjustable screw (16) that presses towards said counterroller (1) against consisting of A coating device featuring: 5. a screw (16) is threaded into the internal thread of the coaxial adjustment screw (14); Moreover, the female thread of the adjusting screw (14) is different from the male thread of the adjusting screw. A screw (16) having a removable cover member (16) is screwed into the adjustment screw. 5. The device of claim 4, wherein the device is prevented from rotating in conjunction with the adjustment screw by 8). 6. Claim 4 or 5, wherein the support strip has the structure according to claim 1 or 2. Device. 7. The holder (7) extends over the entire working width on the side facing the counter roller (1). From claim 4, comprising a guide groove (6) for the vertically extending support strip (5). 6. The device according to any one of items 6 to 6.