1. Field of the Invention
The present invention is generally directed toward an edge cleaning device for a coated web, and more particularly to a non-contact edge cleaning device for a moving web that has been coated and transported with the benefit of rollers.
2. Description of the Background Art
The following discussion of the background art is a result of the present inventors analysis of the systems and features of the related technology of the background art. The present inventors have determined that there are unique problems associated with coated webs and the available technology related to the cleaning of coated webs, particularly along the edges of coated webs moving through a coating or other similar process.
U.S. Pat. No. 3,351,039 to Heisterkamp, the entirety of which is hereby incorporated by reference, describes an exemplary roll cleaning device of the background art particularly designed to clean the edges of a sheet coating roll. Heisterkamp describes problems associated with the coating of certain sheet materials, such as sheets coated with latex materials. Often the coated sheet is applied with a coating in a quantity greater than the desired coating thickness to ensure full or adequate coverage over the sheet. The coated sheet is then carried over a backing roll where a proper coating weight is achieved by a knifing action of an air jet. The excess coating is subsequently sheared off to a collection pan below the air jet. The excess coating often carries over the edges of the sheet with the result that the backing roll is eventually coated with the excess coating material.
As seen in
The present invention overcomes the shortcomings associated with the background art and achieves other advantages not realized by the background art.
An aspect of the present invention, in part, is directed toward an edge cleaner device for a moving web that is capable of cleaning the edge of a moving web both at and before (upstream) of a backing or coating roller.
An aspect of the present invention, in part, is directed toward an edge cleaner device for a moving web that is capable of cleaning the edge of a moving web while minimizing undesirable carryover of excess coating to uncoated portions of the moving web.
An aspect of the present invention, in part, is directed toward an edge cleaner device for a moving web that is capable of cleaning the edge of a wide range of sizes of moving web(s) and automatically aligning and positioning the edge cleaner device with respect to the outside edge or width of the moving web.
One or more of the foregoing aspects of the present invention is accomplished, in part, by an edge cleaning device for an outside edge of a moving, coated web, the device comprising a nozzle assembly imparting a fluid jet toward the outside edge of the moving, coated web; and a scraper device operatively secured with the nozzle assembly to a common carriage, wherein the nozzle assembly and the scraper device are capable of being simultaneously positioned by the carriage along the outside edge of the moving, coated web.
One or more of the foregoing aspects of the present invention is also accomplished, in part, by an edge cleaning device for an outside edge of a moving, coated web, the device comprising a nozzle assembly imparting a fluid jet toward the outside edge of the moving, coated web; and a collection container operatively secured with the nozzle assembly to a common carriage, wherein the collection container and the nozzle assembly are capable of being simultaneously positioned by the carriage along the outside edge of the moving, coated web, and the fluid jet of the nozzle assembly is directed in a direction toward an opening of the collection container.
One or more of the foregoing aspects of the present invention is also accomplished, in part, by a system for cleaning an outside edge of a moving, coated web, the system comprising a moving, coated web; a roller for operatively engaging the moving, coated web; a movable carriage supporting an edge cleaning device; a nozzle assembly imparting a fluid jet toward the outside edge of the moving, coated web; and a scraper device operatively secured with the nozzle assembly to the movable carriage, wherein the nozzle assembly and the scraper device are capable of being simultaneously positioned by the carriage along the outside edge of the moving, coated web.
One or more of the foregoing aspects of the present invention is also accomplished, in part, by a system for cleaning an outside edge of a moving, coated web, the system comprising a moving, coated web; a roller for operatively engaging the moving, coated web; a movable carriage supporting an edge cleaning device; a nozzle assembly imparting a fluid jet toward an outside edge of the moving, coated web; and a collection container operatively secured with the nozzle assembly to the movable carriage, wherein the collection container and the nozzle assembly are capable of being simultaneously positioned by the carriage along the outside edge of the moving, coated web, and the fluid jet of the nozzle assembly is directed in a direction toward an opening of the collection container.
One or more of the foregoing aspects of the present invention is also accomplished, in part, by a method of cleaning an outside edge of a movable, coated web, the method comprising positioning an edge cleaner device with respect to an outside edge of a movable, coated web, wherein the edge cleaner device is positioned upstream from a roller for operatively engaging the moving, coated web; imparting a fluid jet from a nozzle assembly of the edge cleaner device toward an underside and an outside edge of the moving, coated web; and simultaneously positioning a scraper device along the outside edge of the moving, coated web, wherein the scraper device is operatively engaged with an upper surface of the moving web without contacting a surface of the roller.
One or more of the foregoing aspects of the present invention is also accomplished, in part, by a method of cleaning an outside edge of a movable, coated web, the method comprising positioning an edge cleaner device with respect to an outside edge of a movable, coated web, wherein the edge cleaner device is positioned upstream from a roller for operatively engaging the moving, coated web; imparting a fluid jet from a nozzle assembly of the edge cleaner device toward an underside and the outside edge of the moving, coated web; and simultaneously positioning a collection container operatively secured with the nozzle assembly, wherein the collection container and the nozzle assembly are simultaneously positioned along the outside edge of the moving, coated web, and the fluid jet of the nozzle assembly is directed in a direction toward an opening of the collection container.
Further scope of the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description given hereinafter and the accompanying drawings that are given by way of illustration only, and thus do not limit the present invention.
The present invention will now be described in detail with reference to the accompanying drawings. The present inventors have analyzed the needs of the background art and identified several shortcomings associated with the systems of the background art.
As seen in
A first edge cleaning device of the present invention can incorporate a thin scraper device 30, e.g., a blade is shown in
However, the present inventors have determined that abrasion marks form over time in the surface of the rubberized backing roll. In order to compensate for the effects of the scraper device 30, coating runs are often scheduled so that the widest webs are ran through the rollers 20, 22 first and the narrower webs are then gradually processed as the rubberized backing roll 20 is abraded or otherwise worn. After repeated coating runs, the rubberized backing 20 typically requires replacement resulting in costly machine down times and/or maintenance and repair.
Alternatively, the present inventors have determined that the scraper device 30 can be optimally positioned so that it only contacts the moving web, e.g., and does not significantly contact the surface of the backing roll 20. The inventors have determined that this approach is successful in minimizing carryover of excess coating to the surfaces of the backing roller 20 and/or the underside 14 of the moving web 10. The scraper device 30 rides only on the paper web 10 to the edge but does not overlap to touch the adjacent backing roller 20 surface (as shown in
Accordingly, by not touching the backing roller 20 surface, the problem of marring of the roll is effectively eliminated. However, the present inventors have determined that additional features in combination with the optimized scraper device 30 and/or standing alone, when incorporated into a non-contact edge cleaning device will further optimize and/or offer alternative approaches to minimizing carryover of excess coating along the edge of the moving web. For example, the scraper device 30 preferably rides only on the paper web, e.g., riding on the underside or uncoated side 14 of the paper web 10 to the edge of web but not overlapping to touch an adjacent roller, e.g., such as backing roller 20.
Alternatively, the scraper device 30 is preferably applied to a slightly or moderately tensioned web without need for a backing roll, e.g., the use of a backing roller 20 may be optional. In a more preferred embodiment, the scraper blade is positioned at about a 90° angle θ to the underside or uncoated side 14 of the paper web as part of the moveable carriage 70 assembly, although a wide range of angles may be employed as discussed in greater detail hereinafter. The scraper blade or scraper device 30 can be integral to the carriage assembly or a separately supported and movable component. By riding on the uncoated underside of the web, any coating that wraps around the web is easily and conveniently removed by scraper device 30 and the water jet of nozzle assembly 50. The scraper device 30 is positioned in proximity to collecting container 40 and nozzle assembly 50. The fluid jet from nozzle assembly 50 is directed toward the underside edge of the moving web (and in the direction of container 40) so as to direct excess coating toward container 40. Therefore, any remaining coating or water wrapping around to uncoated side 14 is conveniently removed by scraper device 30.
For example, as seen in
The nozzle assembly 50 may incorporate a needle nose jet of water, air, or combination thereof directed toward the opening 42 of the container 40. U.S. Pat. No. 2,653,566 to Worden; U.S. Pat. No. 3,351,039 to Heisterkamp; U.S. Pat. No. 4,359,964 to Johnson; and U.S. Pat. No. 6,176,939 to Oechsle et al. describe the construction, materials and operation of several nozzle assemblies of the background art employing water, air and/or water/air mist fluid flows that may be incorporated into the unique edge cleaning device of the present application. Accordingly, the entirety of each of the above-identified applications is hereby incorporated by reference.
The collection drain or container 40 can be formed in a variety of shapes and positions that allow the container 40 to collect and/or carry away excess coating. For example, the container 40 can be a conical or cylindrically shaped receiving cup 40 or cone that includes a vacuum supplied by a vacuum hose 62, e.g., such as a reinforced, flexible hose. The receiving cone or container 40 can be supplied with vacuum, but this arrangement is optional depending upon the desired application. As seen in
The nozzle assembly 50 is supplied via a supply hose 52, 60 or rigid tubing providing some structural support and positioning of the nozzle assembly 50 with respect to the web 10. The fluid of the nozzle assembly 50 is preferably a water jet positioned to disperse the coating material without need of applying a vacuum. The fluid jet can be a stream of water, preferably a needle stream or sharp stream of water under pressure. However, one of skill in the art will appreciate that various pressures and/or combinations of water/air and spray patterns may be useful for some coatings, e.g., depending upon the characteristics of the coating such as viscosity or rheology. However, a needle stream of water directed at the edge of the web 10 in the direction of the container 40 is utilized in a preferred embodiment.
As aforementioned, the scraper device 30 may be used in combination with the nozzle assembly 50 and/or the vacuum container 40. The scraper device 30 in combination with water jet 50 moves or disperses the bead of any excess coating into the receiving container 40. In addition, the edge cleaner device is preferably provided with a moveable carriage 70 or support structure that permits movement of the edge cleaning device sideways, e.g., movable toward and away from the edge of the web, and even vertically if desired. In a preferred embodiment, the carriage 70 includes a position controller 84 and a motor 75 or other device permitting movement and positioning of the carriage 70 of the edge cleaner device. Since the edge cleaning device is sideways movable toward and away the edge of the web 10, it can be quickly and accurately positioned relative to a wide range of sizes of coated webs 10. In addition to the guides 48 for controlling the positioning of the moving web 10 with respect to the edge cleaner device, the present invention may incorporate other self-positioning or position control features.
For example, as seen in
One of skill in the art will appreciate that the edge cleaning device is shown positioned in a retracted position, e.g., away from the moving edge of the coated web 10 in
The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
Number | Name | Date | Kind |
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2653566 | Worden | Sep 1953 | A |
3351039 | Heisterkamp | Nov 1967 | A |
4359964 | Johnson | Nov 1982 | A |
4641070 | Pfizenmaier et al. | Feb 1987 | A |
4924891 | Soubrier et al. | May 1990 | A |
5328511 | Beisswanger | Jul 1994 | A |
5688555 | Teng | Nov 1997 | A |
5718763 | Tateyama et al. | Feb 1998 | A |
5780109 | Yapel et al. | Jul 1998 | A |
5783044 | Schneider et al. | Jul 1998 | A |
5858090 | Gottwald | Jan 1999 | A |
5939139 | Fujimoto | Aug 1999 | A |
6145217 | Goebel | Nov 2000 | A |
6176245 | Takahashi et al. | Jan 2001 | B1 |
6176939 | Oechsle et al. | Jan 2001 | B1 |
6364959 | Straub et al. | Apr 2002 | B1 |
20030127107 | Cheng et al. | Jul 2003 | A1 |
Number | Date | Country |
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06-115782 | Apr 1994 | JP |
Number | Date | Country | |
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20050178404 A1 | Aug 2005 | US |