FI110848B - Return trough in coating device - Google Patents

Description

The present invention relates to a trough according to the preamble of claim 1, in particular for collecting a backflow of a film transfer coating or a blade coating.

In film transfer coaters, the coating is applied by an appliqué applicator to the surface of the roll and transferred by roll with the film to be treated as a film. Film transfer coatings can be used for surface sizing and coating of paper or cardboard and have good runnability. An appliance device is a device similar to a short-stay coating, in which the coating is dispensed with an applicator chamber 15, which in the direction of movement of the roll is delimited by a doctor blade or rod on the inlet side and a front wall, blade or rod. Since the application chamber is fed with a higher flow rate of coating material than is required to produce the coating film on the surface of the film transfer roll, the excess must be led to a return cycle.

The coating which flows out through the front of the application chamber must be collected in a suitable manner. Return flow collection; a return tray attached to the bar of the appliance is used. Placing the return trunk in the space between the beam and roll of the applikoin space device is extremely difficult and difficult to position due to the fact that the beam must be able to be turned outwards in the stop and track situations. In order to move the applicator outward .. 30 rollers, the pivot point of the beam is below the applicator. The return pool is, of course, mounted below the appliqué '·' *, so that the pool moves away from the j: roll as the bar is turned toward the roll. Since the pool must not touch the disc on the roll, the edge of the return pool must be far enough1. 35 hen from the roll in its operative position so that, for example, in case of web breaks, the • web, possibly wrapping around the transfer roll, is not • caught between the front edge of the return tray and the roll.

2 110848

In the event of a break, the opening of the application bar must be done quickly, so the movement of the return tray must be fast and controlled. Alternatively, the pool can be hinged at its upper edge, for example, so that it can be inclined 5 away from the roll in the direction of the applicator.

A disadvantage of the fixed or upper hinged collecting basin is that the leading edge of the basin is too far away from the roll when in use, whereupon the Rois-10 glue or coating on the return cycle drips past the applicator above the tray and web directly causing the paper produced. Splashes also soil the machine and increase the need for cleaning and maintenance and make working on the machine uncomfortable.

15

A large fixed tray with an edge close to the applicator roll can also be used as the return tray. The fixed trough extends below the applicator frame beam and the beam rotates above the trough. Although 20 fixed troughs can be used to collect the return flow efficiently. also, its weakness is the long viii of the return mixture; at the open trough. The long residence time results in partial drying or solidification of the mixture, which makes the coating of the coating difficult. Because of the dryness of the treatment mix '· *: 25, a large solid return tray is often not a good i' · solution despite its good collection efficiency. Great! · ': A solid trough is very expensive because it has to be made of corrosion-resistant material. Especially when using small-split icy f air press rolls and skewing 30 n through the f press press, there is not enough space for a separate return trunk mounted on a solid body.

It is an object of the present invention to provide a film transfer; 35 return wrapper for a wrapper or similar device to better collect the glue or wrapper for the return pad 1101048 and to prevent splashing into the environment and the web.

The invention is based on the first 5 hinges being attached to the applicator or beam supporting it and the second hinge and link arm to a fixed structure or to the applicator beam. The loading arm is positioned to guide the leading edge of the return tray so that the leading edge moves toward the film transfer roller when the 10 applicator units are moved away from the roller. Thus, the position of the leading edge of the return trough is forced-controlled with the articulated arm fixed to a fixed structure or can be controlled by an air or hydraulic cylinder if the articulated arm is formed by a cylinder. The forced control may be implemented by means of an alternate pin-to-slot combination.

Most preferably, the articulated arm of the second joint is secured to the body structure of the applicator roll in a region delimited by the end of the roll, thereby providing a forced control structure with the leading edge of the return tray always at the extreme positions of

More particularly, the return hopper according to the invention is characterized in what is stated in the characterizing part of claim 1.

The invention provides considerable advantages.

By means of the invention, the return tray is obtained in the operating position close to the transfer roller f. The trough effectively collects spills of the return flow and the return flow is prevented from leaking into the stream or contaminating the environment. The structure of the tray is unique- '... · fold, it requires little space and the tray can be made small. Material costs for a small trough,. : 35 are smaller and the return delay time is short. The cover is in the open state for as short a time as possible, so the 4 110848 remains better quality and does not cause excessive drying.

The invention will now be explained in more detail with reference to the accompanying drawings.

Fig. 1 shows an applicator with a return tray according to the invention in an operating position.

Figure 2 shows the device of Figure 1 in the service position.

Fig. 3 shows another applicator with a return tray according to the invention in an operating position.

Figure 4 shows the device of Figure 3 in the service position.

Fig. 5 shows a third applicator with a return tray according to the invention in an operating position.

Figure 6 shows the device of Figure 5 in the service position.

.1! Figure 7 illustrates a fourth embodiment of the invention in an applicator position.

Figure 8 shows the device of Figure 7 in the service position.

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· ': The film transfer press applicator device shown in Figures 1 and 2 with the actual applicator unit 5 attached to the tilting beam 6. The tilting beam;' i '; 30 refers to a structure in which the beam 6 is connected. to the road frame with the side centered at the center of the beam 3 ;; Opposite the application unit 5 is a film transfer roll 1 which is secured to the body 13 via a bearing bracket 2. The pivot joint 7 of the application unit is a beam 6 i \; 35 at the bottom and between the beam 6 and the appliance body 3 a hydraulic cylinder 4 is mounted on which the unit 5 110848 is rotated. The return tray 16 is disposed in the space between the film transfer roller 1 and the appliance body 3. The return trough 16 consists of a guide lip 9 and a trough 8. The upper edge of the guide lip 15 is secured to the beams 6 of the applicator unit 5 near the front edge 14 of the chamber of the applicator unit by a joint 9. The return flow may be directed to the guide lip 15 of the return tray 16 by a guide plate 17 10 or the like, and, if desired, a fixed manifold lip 15 may be replaced by a separate guide member. The collecting trough 16 extends over the entire width of the applicator 5 and the film transfer roller 1.

Figure 2 shows the device of Figure 1 in an open position. The upper edge of the trough 16 attached to the beam 6 on the beam 6 moves away from the roll 1. In this forced control application, the front edge of the trough 16 mounted on the loading lever 11 is then moved . Since the loading lever 11 'is fixed near the bearing point of the roll 1, it' * moves near the surface of the roll 1 such that the leading edge of the return tray 16 is closest to the roll 1 in 25 positions of movement of the beam 6 of the applicator unit 5. the articulation guide guides the trough 16 '. · ·' close to the film transfer roller 1 when the applicator 5, 6 is turned to the operating position. In this position, the collecting chute accurately covers the space 30 between the transfer roller and the applicator and effectively collects the return flow and the applicator. spills from the machine and roller.

In Figures 3 and 4, the return tray is arranged in connection with the rotating beam: ':. The pivoting beam 5 of the application unit 5 differs from the tilt beam i '·) 35 with the pivot 5 bearing at its pivot point 18. The collection trough 16 has the same structure as in the above embodiment and the load lever 11 is secured to the bearing of the film transfer blade 1 The roller 1 is smaller in diameter, so that the loading lever 11 is correspondingly shorter. In this embodiment, the loading lever 11 is a fluid or compressed air cylinder. By means of the cylinder, the return tray is brought as close as possible to the roll 1 in the operating position and, in the event of a web break and the web rotating around the filament transfer roller, the return tray can be quickly pulled away from the roll 1.

10 It is advantageous to use a pneumatic cylinder as a loading lever because it facilitates a rapid return trough movement than a hydraulic cylinder. The opening of the applicator 5, 6 takes place in a manner similar to that of the previous example, and the movement of the collecting chute is approximately the same.

In the embodiment shown in Figures 5 and 6, the loading lever 11 is secured to the beam 6 of the applicator. The loading lever must be a pneumatic or hydraulic cylinder 20 which controls the leading edge of the return tray 11 so that the leading edge remains close to roll 1. The pneumatic cylinder! is well suited for adjusting the return tray position, since the tray * can be simply controlled between two extreme positions, which may be cylinder end positions. On the other hand, with the hydraulic roller 25, the edge of the trough can be held! '· * Close to the roll 1 during the entire rotation of the bar 6 of the appliance unit *, ·' · '. The cylinder 11 is preferably positioned with its piston rod in its outer end position in the operating position and the cylinder force is dimensioned 30 so that the trough 16 can be displaced away from the film transfer roller 16 when the gap between the roll and trough can be blocked. The same dimensioning is advantageously used in the embodiment of Figs.

I,, ·. ; Figures 7 and 8 illustrate a structure in which the forced steering linkage and the collector trough joint are replaced by a pin 19 and a guide slot 20 in place of the joint 7 110848. The guide slot 20 is secured to the applicator beam frame 3. The pin 19 can be positioned over the joint 10 to the same ear. The guide groove 20 5 is shaped as desired so that the front edge of the trough is in the operating position close to the film transfer roll 1 and is displaced when the applicator beam 6 is rotated so that the leading edge of the trough does not touch the roll.

In addition to the above, the present invention has other embodiments.

Preferably, the loading lever 11 is fixed to a fixed point 15 relative to the beam 6 of the applicator unit 5, such as the body of the applicator roll 1 or the applicator 5, 6. Most preferably, the lever 11 is fixed close to the center axis of the film transfer roller 1 and the other end of the lever is secured to the front edge of the collection trough. In this case, the movement of the front edge of the trough is similar to that described above, or if the lever attachment point 20 is just at the center axis of the roll 1, the front edge remains at a distance determined by the lever length from the surface of the roll. If the lever is closed ''. is applied to the applicator body 3, its length and pivot points are aligned such that the leading edge of the return tray '·' 25 is in the operating position of the applicator near the roll surface! ·· and the leading edge cannot come into contact with the roll of the appliance unit 5 during the rotation of the roller. Preferably, the end of the loading lever 11 attached to the return tray 16 is pivoted as close as possible to the front edge of the tray 16, but other anchor points 30 may be used. It is essential that the return pan is suspended with at least two hinges spaced apart and a '···' loading lever guiding the front edge of the trough is attached to one of the hinges. The lever may be adjustable and since the return tray is usually,. : 35 very wide with attachment joints and load lever at both ends. If necessary, the return tray can be fixed to the beam, even if its back edge cannot be pivoted directly to the beam and there is a flexible bar at the front edge of the tray.

The collecting tray according to the invention can be used with coating devices other than those described above. In this case, blade coating devices are mainly suitable. The invention can also be applied to collecting the coating scraped by the scraper blades.

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Claims (13)

A return tray (16) in a casing comprising: 5. at least one roll (1) attached to the bearing housings (2), - at least one applicator located on the roll, comprising an applicator unit 10 (5) and a beam (6), wherein the applicator unit (5) is mounted and pivotally mounted on the body (3), and - a return tray (16) arranged in the space 15 between the applicator (5, 6) and the roller to collect a flow from the application unit, the return tray (16) comprising 8) having a leading edge on the side of the roll (1) and a trailing edge on the side of the application unit, characterized in that; · '- the return tray (16) is suspended from at least one of the second *' accesses via the first joint (9) to the beam (6) of the aperture unit (5) and to the return box I '·· , 20), which iT: forcibly controls the front edge of the return tray so that the leading edge is moved toward the film transfer roller (1) when the application unit is moved toward the roller (1) and 30 when the application unit is moved away from the child to prevent the front edge of the return tray (16) from touching the applicator roll. i:. · *. Arrangement according to Claim 1, characterized in that the guide member is connected via a second joint (10) to a loading lever (11) attached to its return point (16) at its second point 10 110848. Arrangement according to Claim 2, characterized in that the other end of the loading lever (11) is fixed to a structure rigid with respect to the beam (6) so that the loading lever (11) guides the return tray (16) near the leading edge of the roll (1). with the applicator (5, 6) in the operating position. Arrangement according to Claim 3, characterized in that the other end of the loading lever (11) is fixed outside the width of the roll (1). Arrangement according to Claim 4, characterized in that the other end of the loading lever is attached by a joint (12) to the bearing housing (2) of the roller (1). Arrangement according to Claim 5, characterized in that the other end of the loading lever is attached by 20 pivot points (12) to the central axis of the film transfer roller (1). Arrangement according to Claim 1, characterized in that the guide member is a pair of pins, the second member (19) of which is attached to the return tray (16) and the second fixed structure (3). t Arrangement according to one of the preceding claims, characterized in that the first joint (9) is located at the upper edge of the rear edge of the return tray (16). 30 <<» Arrangement according to Claim 7, characterized in that the rear edge of the return tray (16) is a guide lip (15) extending higher than the front edge. : 35 Fitting according to one of the preceding claims, characterized by a flexible strip fixed to the front edge of the return trunk (16)> 11084811. 9 110848 Arrangement according to Claim 1, characterized in that the other end of the loading lever (11) is fixed to the beam (6) of the application unit and the loading arm (11) is an air or hydraulic cylinder which guides the front edge of the return tray (16). near the film transfer roller (1) with the applicator (5, 6) in the operating position. Arrangement according to one of Claims 1 to 10, characterized in that the loading lever (11) comprises a hydraulic or pneumatic cylinder. An arrangement according to claim 12, characterized in that the cylinder (11) is positioned such that its piston rod is in its outer end position when the return trough (16) is in the operating position and the cylinder force is dimensioned so that the trough (16) (16) when the 20 gap between the roll and the trough is possibly blocked. • «» I ·> t f i t, i; i2 110848