Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Reshaping running or indefinite-length work
Reexamination Certificate
1999-07-15
2001-12-04
Tentoni, Leo B. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Reshaping running or indefinite-length work
C100S16200R, C100S168000, C100S331000, C100S334000, C425S367000, C425S368000
Reexamination Certificate
active
06325960
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 198 32 064.7, filed on Jul. 16, 1998, the disclosure of which is expressly incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a calender for fibrous material webs and a method of operating a calender for fibrous material webs having two roll stacks arranged in a common plane on a stanchion, each of which has a top roll, a bottom roll, and three intermediate rolls, in which the top roll and the bottom roll are each embodied as a deflection adjustment roll with a sleeve which is supported by way of a deflection adjustment device on a rotationally fixed bracket.
2. Discussion of Background Information
In a known calender discussed in German Patent Document No. DE 196 33 671 A1, two roll stacks of five rolls each are provided, and are arranged one above the other in a common vertical plane. The stacks are passed through by the paper web. The top roll is stationarily attached to a stanchion and the bottom roll is attached to a carriage that can be moved and loaded in the direction of the roll stack by a hydraulic cylinder. The sleeves of the deflection adjustment rolls are supported on their ends on respective brackets while the brackets are stationarily held on the stanchion or carriage. Each change in the load leads to a change in the roll stack.
The use of sleeve lift-type deflection adjustment rolls and bottom rolls of a roll stack is known from German Patent Document No. DE 30 04 913 C2. In such a device, however, the sleeve of the one end roll is moved during operation until it rests against a stop so that the position of the sleeve is fixed in relation to the stanchion.
SUMMARY OF THE INVENTION
The present invention provides a calender for a fibrous material web such as paper or the like, and further provides a method of operating a calender for a fibrous material web.
The calender includes a first roll stack and a second roll stack each arranged in a common plane on a stanchion, each roll stack having a top deflection adjustment roll having a sleeve, a bottom deflection adjustment roll having a sleeve, and three intermediate rolls disposed between the top deflection adjustment roll and the bottom deflection adjustment roll, the uppermost the intermediate roll being fixedly mounted to the stanchion. The calender further has a deflection adjustment device having a sleeve lift supporting each sleeve. At least one deflection adjustment device faces the first roll stack in a first operative position and faces the second roll stack in a second operative position. The calender also includes a nonrotatable bracket supporting each deflection adjustment device and fixedly mounted to the stanchion. The bottom roll of the first roll stack and the top roll of the second roll stack are disposed adjacent to each other and adapted to form a nip therebetween by closing a sleeve lift of at least one of the bottom roll of the first roll stack and the top roll of the second roll stack.
The calender may further include a lift guide and an adjusting device, at least one deflection adjustment device having a plurality of support elements. Also the lift guide and the adjusting device are adapted to revolve, by approximately 180°, at least one of the plurality of support elements about a central axis of a deflection adjustment roll.
Also, the calender may have a plurality of levers and a plurality of pivoting axles, each lever adapted to support a respective one of the second and third intermediate rolls of the first and second roll stack. The levers may be adapted to pivot about a respective pivoting axle of the plurality of pivoting axles. The pivoting axles are also fixedly mounted to the stanchion.
The top deflection adjustment roll, the bottom deflection adjustment roll, and the second intermediate roll of each roll stack may have an elastic cover, and the first and third intermediate rolls of each roll stack each may be heatable, hard rolls.
The calender may further have a feeder device adapted to insert the web through all nips of each of the roll stacks and through the auxiliary nip. Also, each roll may further include a drive. The calendar may also operate on the fly.
Additionally, the common plane may extend obliquely to the horizontal, preferably extending about 45°. The stanchion may extend generally parallel to the common plane and may be supported from below and above by bearing faces, the bearing faces being fixedly mounted to a structure. Also, the bearing faces may be concrete pedestals.
The rolls may be arranged on the oblique top side of the stanchion. The calender may further have a hydraulic adjustment device adapted to move at least one roll generally perpendicular to the common plane.
The calender may yet still have a roll bracket adapted to hold one of the bottom roll of the first roll stack and the top roll of the second roll stack, a cam disk adapted to hold the roll bracket, and a bearing adapted to support the cam disk. The cam disk may be further adapted to reduce the distance between the bottom roll of the first roll stack and the top roll of the second roll stack. An adjustment device adapted to rotate the cam disk by approximately 180° may further be provided.
The calender may also have a drier having a last drying roll and a drying device. The last drying roll and the winding device may be arranged at approximately the same height.
The method of operating the above calender may include forming a nip between the bottom roll of the first roll stack and the top roll of the second roll stack, and closing a sleeve lift of at least one of the bottom roll of the first roll stack and the top roll of the second roll stack.
The method may also include revolving, by a lift guide and an adjusting device, by approximately 180°, at least one support element about a central axis of a sleeve.
Further, the method may include supporting a respective one of the second and third intermediate rolls of the first and second roll stack, and pivoting the levers about a respective pivoting axle of the plurality of pivoting axles.
Also, the method may include inserting the web, via a feeder device, through all nips of each of the two roll stacks and also inserting the web through the auxiliary nip. The calendar may also be operated on the fly.
The stanchion may be supported from below and above on bearing faces, and the bearing faces may be fixedly mounted to a structure. Also, a hydraulic adjustment device may be used to move at least one roll generally perpendicular to the common plane.
Also, the distance between the bottom roll of the first roll stack and the top roll of the second roll stack may be reduced by using a cam disk. An adjustment device may be used to rotate the cam disk by approximately 180°.
The present invention further provides a calender that is suitable for the production of a large variety of different paper qualities.
In the present invention, all of the deflection adjustment rolls are of the sleeve lift-type having brackets that are fixedly mounted on the stanchion. The topmost intermediate rolls are fixedly mounted on the stanchion, and the bottom roll of the first roll stack and the top roll of the second roll stack are arranged adjacent to each other and can form an auxiliary nip that can be closed by using the sleeve lift. Also, the deflection adjustment device is adapted to face the first roll stack in a first operative position and face the second roll stack in a second operative position.
There are two regions in each roll stack, namely the uppermost nip and the remaining nips (i.e., a total of four regions) in which compressive stresses that are independent of each other are spread virtually over the entire line load range. The maximum compressive stress may be applied to the uppermost nip, which improves the satination effect on the web. Moreover, the paper web may be treated in an auxiliary nip, for example, to produce a matte satination, if the defl
Helmus Mathias
Hinz Joachim
Kayser Franz
Stock Gerhard
Greenblum & Bernstein P.L.C.
Tentoni Leo B.
Voith Sulzer Papiertechnik Patent GmbH
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