Drying and gas or vapor contact with solids – Apparatus – Sheet – web – or strand
Reexamination Certificate
1999-03-11
2001-03-20
Gravini, Stephen (Department: 3749)
Drying and gas or vapor contact with solids
Apparatus
Sheet, web, or strand
C034S633000, C034S639000, C034S655000
Reexamination Certificate
active
06202323
ABSTRACT:
The invention relates to an apparatus for treating thin material webs, especially those made of paper, film or the like, using a gaseous medium, especially feed air, in a drying chamber, through which the material web can be conveyed, preferably continuously, and in which the medium is directed onto the material web from above and/or from below via a number of transversely oriented slot nozzles.
The drying of the material web, which is preferably coated, is performed by the gaseous medium, which is directed onto the material web by means of transversely oriented slot nozzles. In addition, in order to increase the drying effect, the gaseous medium or parts of the drying equipment or parts of the slot nozzles may be heated. The flow conditions in the area of the material web and the supply of heat to the latter are predefined here by the design configuration of the slot nozzles and thus cannot be adapted to different operating conditions, for example different material webs or transport speeds of the same. If the flow conditions or the supply of heat are not configured optimally, this may have an adverse effect on the material web, for example insufficient drying or damage. If the transport speed is reduced (for production reasons) or the web is brought to a standstill, the latter may burn if heat continues to be supplied to it.
The invention is thus based on the object of improving the flow conditions between the slot nozzles and the material web under variable operating conditions.
In order to achieve this object, the apparatus according to the invention is characterized in that at least some of the slot nozzles have a number of nozzle slots, and in that the volume flow of the gaseous medium through at least one nozzle slot can be adjusted by a control device. By means of the control device, in the extreme case the inflow can be changed over in this way from one nozzle slot to a different nozzle slot. By this means, the position at which the gaseous medium acts on the web and, if necessary, the direction of this action can be changed by the control device.
In a further refinement of the invention, the control device has at least one slide device. The slide device preferably has a basic body and a covering body each having at least one opening which, when the slide device is opened, form at least one common opening for the gaseous medium to pass through to at least one nozzle slot, and the common opening can be closed by changing the relative position of the basic body and the covering body. While the drying apparatus is operating, it is therefore possible in a simple way, by manually or automatically changing the relative position of the basic body and the covering body, for example by displacing one of the bodies, to change the action on the material web of the gaseous medium and thermal energy. In addition to simple operability, a slide device of this type has the advantage that it can be produced in a simple way.
The nozzle slots of a slot nozzle preferably have different outflow directions of the gaseous medium. For the maximum supply of heat to the material web, the latter may rest on a heated roll. In the event of a (temporary) standstill of the material web and of the heated roll, overheating of the material web in the contact area with the roll may be prevented by the gaseous medium being fed to the contact area between the roll and the material web, tangentially in relation to the roll, by activating a tangential nozzle, so that an air cushion is built up between the roll and the material web. At the same time, the thermal energy of the roll is dissipated by the air cushion in the tangential direction by means of the gaseous medium.
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Abelman ,Frayne & Schwab
Gravini Stephen
Pagendarm Technologie GmbH
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