Apparatus and method for the manufacture of particleboard
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United States of America Patent
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Dec 13, 1983
Grant Date -
N/A
app pub date -
Feb 19, 1982
filing date -
Feb 27, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for the continuous manufacture of particle board from a mat of cellulose based material in the form of particles, fibers or the like, together with at least one heat hardenable binder, features a high frequency heating station 4 disposed between a scattering station 2 and a finishing press 9. The mat 3 scattered in the scattering station 2 is continuously fed on an endless conveyor band 1 through a working gap defined between upper and lower electrode plates 5 and 6 of a high frequency capacitive heating arrangement in the high frequency heating station 4. A recirculating cover band 7 contacts the upper surface of the mat and the mat is moved with full-area contact between the upper and lower electrode plates 5 and 6, i.e. without any form of air gap. Several variants are described, in particular the upper and lower electrode plates 5 and 6 can be constructed to compress the mat to a certain degree. In the FIG. 2 embodiment several sequential pairs of electrode plates 5, 6; 5', 6' are used to heat the mat in stages with compression 10 taking place between sequential pairs of electrodes.
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