Winding – tensioning – or guiding – Convolute winding of material – With cutting – perforating – or notching
Reexamination Certificate
2000-03-06
2002-10-22
Nguyen, John Q. (Department: 3654)
Winding, tensioning, or guiding
Convolute winding of material
With cutting, perforating, or notching
C242S532300, C242S541000
Reexamination Certificate
active
06467720
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 199 10 566.9, filed on Mar. 10, 1999, the disclosure of which is expressly incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for winding a material web, e.g., a paper or cardboard web, in which the material web is guided over a carrier drum, a winding nip is formed between the carrier drum and the reel spool, and the material web is separated for each reel spool change. The invention further relates to a winding machine that include a carrier drum, a winding nip formed between the carrier drum and the reel spool, and a device for separating the material web for each reel spool change.
2. Discussion of Background Information
A winding machine, similar to the one generally discussed above, is used, e,g., at the end of a machine, for producing or processing a material web. It can also be used, e.g., to rewind a wound roll that has already been wound. The machine can be, e.g., a paper, cardboard or tissue machine.
Various devices for separating a material web for a reel spool change are known. As a result, water jet nozzles operating with high pressure are currently increasingly being used in addition to Gooseneck and Randkobra devices. A disadvantage of the Gooseneck and Randkobra devices is that the material web cannot be guided neatly onto the new, still empty reel spool. In addition, separating with air does not guarantee a clean cut which, particularly in the case of heavy, longitudinally oriented paper, can cause the web not to tear over the entire width, and for only a longitudinal tear to occur after separation of a part of the web. In addition, the Gooseneck has the disadvantage that it requires expensive devices in order to be able to swing the blast nozzle into the center of the web between the full and the new, still empty reel spool.
SUMMARY OF THE INVENTION
The present invention provides a process and winding machine of the type generally discussed above, which also ensures a safest possible separation process with minimal structural expense.
Regarding the process, the invention provides that the material web is cut by two separating elements that can generally be moved cross-wise (transverse) to the web travel direction. The two separating elements are arranged in an area of the two edges of the web, and at a distance from the respective edges, to form a strip, and subsequently moved at least to the center of the web while the material web is running.
The winding machine according to the present invention includes two separating elements, which can generally be moved cross-wise to the web travel direction, and which can be arranged to cut the material web in the area of the two edges of the web, and at a distance from respective edges of the web, to form a strip. The two separating elements can be subsequently moved at least to the center of the web while the material web is running.
The separating elements can be, e.g., cutting elements.
Due to this arrangement, all extremely safe and reliable separation procedure can be ensured with every reel spool change, reducing the structural expense required therefor to a minimum.
It can be advantageous for separating elements which operate in a contact-free manner to be utilized as separating elements, e.g., water jet or laser beam separating elements.
In certain cases, it lay be appropriate for the material web to be cut before the carrier drum, relative to a web travel direction, by the separating elements.
In an appropriate alternative embodiment, the material web can be cut on the carrier drum by the separating elements.
In the case where the material web is cut by the separating elements before or on the carrier drum, it may be advantageous for the material web to be cut such that cutting lines created by the two separating elements overlap in an area of the center of the web.
If the cutting procedure occurs with a full reel spool adjacent to the carrier drum, each strip can be separated in an area on the carrier drum lying between a new, still empty reel spool and the full reel spool. In so doing, each strip can be separated by a blast nozzle, a doctor or a water jet.
If the cutting procedure occurs with a full reel spool arranged at a distance from the carrier drum, each strip can be separated in the open area between the new, still empty reel spool and the full reel spool. In so doing, each strip can be separated by a blast nozzle, a waterjet or a moveable element, e.g., an impact cutter.
In certain cases, it may be appropriate for each strip to be separated by an adhesive element, e.g., a double-sided adhesive band, inserted into the winding nip between the carrier drum and the new reel spool and arranged to act on both sides.
Generally, the material web can be cut on the new, still empty reel spool by the two separating elements.
In another appropriate embodiment, the material web can be cut after the carrier drum, relative to the web travel direction, by the separating elements. In so doing, the material web may be appropriately cut such that the cutting lines created by the two separating elements overlap in the area of the center of the web.
A double-sided adhesive band can be used, e.g., to support the winding of the first layers on the new reel spool.
The present invention is directed to a process for winding a material web onto a reel spool in an apparatus that includes a carrier drum positioned to form a winding nip with the reel spool, and two separating elements. The process includes guiding the material web over the carrier drum, positioning the two separating elements in a region of the two edges of the material web and at a distance from the respective edges of the material web, cutting the material web, in preparation of a reel spool change, by moving the two separating elements cross-wise to a web travel direction at least to the center of the web while the material web is running, thereby forming strips at the respective edges, and separating the cut material web.
In accordance with a feature of the instant invention, the material web may be one of a paper and cardboard web.
According to another feature of the invention, the two separating elements can operate in a contact-free manner. Further, the two separating elements can include at least one of a water jet and a laser beam separating element.
In accordance with another feature of the present invention, the two separating elements can be positioned to cut the material web before, relative to the web travel direction, the carrier drum.
According to still another feature of the invention, the two separating elements can be positioned to cut the material web at a position where the material web is supported on the carrier drum.
In accordance with a further feature of the present invention, cutting lines created by the two separating elements can be arranged to overlap in a region of a center of the material web.
Further, the reel spool can be a full reel spool, the cutting can occur while the full reel spool is positioned adjacent to the carrier drum to form the winding nip, and the separation can occur in a region in where the material web is supported on the carrier drum. Moreover, the process can further include positioning a new, still empty reel spool against the carrier drum to form a new winding nip. Separation may occur in a region between the new, still empty reel spool and the full reel spool. In this regard, each strip can be separated by one of a blast nozzle, a doctor and a water jet.
Still further, the reel spool can be a full reel spool, and the process can further include moving the full reel spool away from the carrier drum, whereby the winding nip is opened, The cutting may occur while the full reel spool is positioned away from the carrier drum, and the separation can occur in an open area in which the material web is not supported. The process can also include positioning a new, still empty reel spool
Madrzak Zygmunt
Wohlfart Matthias
Greenblum & Bernstein P.L.C.
Nguyen John Q.
Voith Sulzer Papiertechnik Patent GmbH
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