Treatment of formaldehyde-containing wood panel products

Details Treatment of formaldehyde-containing wood panel products Treatment of formaldehyde-containing wood panel products

1986-04-15

1987-07-07

Lusignan, Michael R.

Coating processes

Coating by vapor, gas, or smoke

Wood base

427297, 427440, 428541, B05D 118, B05D 300, C23C 1600

Patent

active

046786864

ABSTRACT:
A process for treating wood panels is disclosed where the panels are placed in a closed treatment chamber and the chamber then evacuated. This removes free formaldehyde from panel pores and produces a subatmospheric pressure within the pores. The chamber is then pressurized with an ammonia and air mixture with ammonia in the mixture permeating the panel pores and reacting with free formaldehyde. The chamber is then evacuated to recover unreacted ammonia.

REFERENCES:
patent: 3008205 (1961-11-01), Blaies, Jr.
patent: 3832107 (1974-08-01), Cox et al.
patent: 4225637 (1980-09-01), Richardson
patent: 4255102 (1981-03-01), Smedberg et al.
patent: 4259378 (1981-03-01), Richardson
patent: 4376807 (1983-03-01), Cannon et al.
patent: 4397756 (1983-08-01), Lehmann
"FD-EX Chamber: Alternative to the Formaldehyde Dilemma", Plywood & Panel Magazine, Apr., 1981.

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