Drying device with improved guide for rotary cut wood veneer

Drying and gas or vapor contact with solids – Apparatus – Sheet – web – or strand

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Details

34663, F26B 1300

Patent

active

057430268

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

In the art of wood treatment, rotary cut wood veneer drying plants are well known.
U.S. Pat. No. 3,199,213 discloses a method for changing the moisture content of wood through strong heating and cooling. U.S. Pat. No. 3,623,235 shows a drying apparatus for veneers, having a conveyor for transporting the material through a passage between radiant drying units.
EP-A-0 451 346 discloses a dryer comprising hot plates hinged to each other for forming two caterpillars reciprocally faced to define a conveyance passage for the wood veneer. Devices of this kind have a structure very complex, since drying is carried out by heating fluid circulating along tubes inside the movable plates. The uniformity of drying is very low. Other known plants comprise a conveyance system moving the material to be dried under hot air currents.
GB-A-5335 discloses a device for drying slack objects like wet rags, conveyed on supporting plate conveyor through hot air flow. The supporting plates have some perforations for the passage of a certain amount of air. The conveying surface is interrupted by flanges bent at right angle on the conveying surface.
A further problem with known drying veneer plants when used for drying wood veneers is that during drying the veneer undergoes shrinking phenomena, which must be assisted to avoid cracking and damage to the wood, and deformation phenomena which on the contrary must be prevented as much as possible.
In the prior art there have been proposed plants in which the conveyance system is provided by a sequence of motorised rollers parallel with each other to be coupled on both sides of the rotary cut veneer. This permits the rotary cut veneer to run while assisting shrinkage. To allow passage of hot air it is however necessary to leave ample spaces between the roller pairs along the rotary cut veneer path. Between one pair and the next the rotary cut veneer can thus be deformed. The leading edge of the rotary cut veneer can also deviate from the established path and fit into the space between two pairs of rollers to jam the machine.
In some machines guide belts have been added and arranged to run between the rollers so as to guide the rotary cut veneer between one roller pair and the next. Because of its flexibility the guide belts cannot however prevent deformation of the rotary cut veneer along the path between the rollers.
There have also been proposed machines in which a chain system moves a plurality of equally spaced crosspieces arranged on either side of the rotary cut veneer to conduct it along the drying path. Even in this case deformation of the rotary cut veneer between two successive supports is not prevented.
The general purpose of the present invention is to overcome the above shortcomings by supplying a rotary cut wood veneer drying machine permitting perfect guidance of the rotary cut veneer and allowing free shrinking but preventing any deformation.


SUMMARY OF THE INVENTION

In view of said purpose it was sought to provide in accordance with the present invention a device for drying rotary cut wood veneer and comprising at least two conveyor loops facing each other along an outbound path to define between them a conveyance passage for the rotary cut veneer with there being along the outbound path drying means acting on the conveyance passage and characterized in that the two conveyance loops comprise conveyance chains supporting transversely to the direction of conveyance a sequential jointed plurality of rigid elements providing facing and essentially unbroken conveyance surfaces along said outbound path to delimit the conveyance passage.


BRIEF DESCRIPTION OF THE DRAWINGS

To clarify the explanation of the innovative principles of the present invention and its advantages compared with the prior art there is described below with the aid of the annexed drawings a possible embodiment thereof by way of non-limiting example applying said principles. In the
FIG. 1 shows a schematic side view of drier in accordance with the present invention, and
FIG. 2

REFERENCES:
patent: 1658684 (1928-02-01), Kocha
patent: 1777764 (1930-10-01), Olson
patent: 1833880 (1931-11-01), Coe
patent: 2792700 (1957-05-01), Altosaar
patent: 3334421 (1967-08-01), Morris
patent: 4399619 (1983-08-01), Martin
patent: 5014772 (1991-05-01), Ariga
patent: 5062218 (1991-11-01), Weil
patent: 5261146 (1993-11-01), Belliot

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