Drying and gas or vapor contact with solids – Process – With nondrying treating of material
Reexamination Certificate
2000-01-10
2001-09-11
Gravini, Stephen (Department: 2162)
Drying and gas or vapor contact with solids
Process
With nondrying treating of material
C034S394000, C034S396000, C034S417000, C034S422000, C034S430000, C034S495000, C034S548000, C034S589000, C034S634000, C034S636000, C034S649000
Reexamination Certificate
active
06286229
ABSTRACT:
This application is the national phase under 35 U.S.C. § 371 of PCT International Application No. PCT/FI98/00375 which has an International filing date of Apr. 30, 1998, which designated the United States of America.
The present invention relates to a method according to the preamble of claim
1
. The invention further concerns an apparatus according to claim
11
.
In the manufacture of planar materials such as wood-based boards, it is necessary to cool the boards exiting from the press, prior to their further processing. Today, the cooling is performed in a board turner/cooler also called a cooling wheel, which is a massive rotary unit having a diameter of 7 m typical comprised of radial slots into which the cut boards are inserted. In the turner, each board can cool freely from both sides during one revolution of the turner, for instance. The capacity of cooling turners is often a bottleneck limiting the production speed or board length in continuously operating board manufacturing lines. The cooling capacity of conventional coolers cannot be varied during operation. Also the emission of obnoxious VOC gases, that is volatile organic carbon compounds has been freely admitted to the ambient air.
It is an object of the present invention to provide a novel method and apparatus capable of overcoming the disadvantages of prior-art techniques.
More specifically, the invention is characterized by what is stated in the appended claims.
The arrangement according to the invention has a number of significant benefits. Particularly, the cooling time of the board material being processed can be shortened essentially. The properties of the board may also be affected during the treatment process. The cooling process of the board can be controlled more accurately and the obnoxious VOC emissions can be confined into a closed space. Moreover, the method may be applied prior to the cutting of the board blank into separate board products.
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Simolin Kari
Tulonen Erno
Gravini Stephen
Valmet Panelhandling Oy
LandOfFree
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