Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Including cleaning – conditioning or renewing means for...
Reexamination Certificate
1999-01-12
2001-07-03
Aftergut, Jeff H. (Department: 1733)
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Including cleaning, conditioning or renewing means for...
C156S446000, C156S458000, C156S459000, C156S578000, C156S187000
Reexamination Certificate
active
06253818
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to methods and apparatus for changing paper accumulating reels utilized with paper tissue machines.
2. Description of the Related Art
In conventional paper machines for producing a paper web of a given width, the web of paper produced by the paper machine is wound around reels. As each reel becomes filled, it is replaced by an empty reel using a process which entails applying air and water. On high-speed paper machines, operators also use adhesive sprays, which should not be used in tissue production, or adhesive strips applied to the empty reels.
Usually, the reels are changed using a transfer tail, which is a narrow strip taken from the entire web width. This so-called “tail cutting” of the paper web requires virtually perfect operation of the tail cutter or web slitting device. In crescent formers, where web formation takes place between wire and felt, this process is made even more difficult because the web has to be detached from the felt. If the web is not detached completely, the reel changing process is seriously jeopardized. In addition to these dangers to production, “tail cutting” also causes a loss of production.
SUMMARY OF THE INVENTION
By contrast to the related art, the present invention is directed to transferring the entire paper web, being dispensed from the paper machine, from one substantially full reel to the next (empty) reel without loss of production and while maintaining a high level of operating reliability.
According to the invention, this is achieved by (1) applying adhesive to a core shaft portion of an empty reel over a region which is substantially entirely the same width of the entire web, (2) placing the core shaft portion thus prepared on the paper web being dispensed to thereby adhere the paper web to the core shaft portion of the empty reel, (3) detaching the paper web from the substantially full reel, and (4) immediately winding the detached web around the core shaft portion of the empty reel. By applying the adhesive over almost the entire width of the paper web, the “tail cutting” process that was previously necessary is avoided and, thus, a complete paper web is always produced over the entire width.
A further development of the invention is characterized by the paper web being glued onto the empty core shaft using an adhesive with good initial adhesive force. This boosts the operating reliability and, as a result, the risk of web breakage, and the loss of production web breakage involved, is kept to a minimum.
An advantageous configuration of the invention is characterized by the adhesive power disappearing after a while, allowing the paper to be removed easily from the empty core shaft at a later point in time. With this arrangement the paper can be wound onto another reel during finishing without any losses and the empty core shaft used again for winding the paper web onto a reel without requiring additional treatment.
A further favorable development of the invention entails adjusting the amount of adhesive applied to a new empty reel. As a result, the optimum amount of adhesive can always be applied, even with changing production conditions, e.g., different basis weights or web speeds.
Another favorable configuration of the invention is characterized by the adhesive application device being moved into a parking position after each application of adhesive to a reel. Thus, the adhesive application device can be cleaned, especially rinsed, after each application. By moving the application device into a parking position, the application nozzle can be rinsed, checked, and also changed if necessary during operations. Since the nozzle is cleaned after every application, an optimum and even supply of adhesive is always guaranteed for the next application. This also enhances the operating reliability of the plant.
The invention is also directed to a device for changing the reels at a paper machine, particularly a tissue machine. According to the invention, it is characterized by an adhesive application device being provided and which is installed on a movable mounting of a winding device at least above the paper web area, at right angles to the web running direction. With this arrangement, adhesive can be applied evenly to an empty core shaft over virtually the entire width, with the result that the paper web can then be removed evenly and simultaneously over the entire width, and wound onto the empty core shaft without any losses of production due to “tail cutting”.
A further favorable development of the invention is characterized by the adhesive application device having connections for the adhesive, control air, spraying air and cleaning agent.
Another advantageous configuration of the invention is characterized by the parking position location being provided outside the machine and into which the adhesive application device can be moved. As a result, the adhesive application nozzle can also be cleaned, inspected and replaced while the paper machine is in operation.
Still another favorable configuration of the invention is characterized by the adhesive application device having a nozzle, which is fitted with a needle to control the amount of adhesive flowing out of the nozzle, where the nozzle may have an adjustable limit stop for the needle stroke in order to set the amount of adhesive. With the aid of the needle, the nozzle hole can be opened and closed at the correct time, and the amount of adhesive flowing therefrom is always at an optimum because the nozzle is adjustable.
A further advantageous development of the invention is characterized by the adhesive application device being secured to a retaining bracket mounted at right angles to the web running direction, where the distance between the retaining bracket and the empty core shaft is adjustable. Since the height of the retaining bracket can be adjusted in relation to the empty core shaft, it is possible to set the approximate position of the spraying cone.
REFERENCES:
patent: 3951890 (1976-04-01), Reilly et al.
patent: 4338147 (1982-07-01), Backstrom et al.
patent: 4488687 (1984-12-01), Andreasson
patent: 4572451 (1986-02-01), Ikeda et al.
patent: 4711405 (1987-12-01), Niskanen
patent: 5009736 (1991-04-01), Lehto
Aftergut Jeff H.
Alix Yale & Ristas, LLP
Andritz-Patentverwaltungs-Gesellschaft m.b.H.
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