Process for preparing particleboard
AssigneeThe Upjohn Company
InventorsWilliam J. Farrissey, Alexander McLaughlin, Douglas P. Waszeciak
Life of this patent
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Abstract
Particle boards are currently prepared by treating the particles (e.g. wood chips) with a binder comprising an organic polyisocyanate and an internal release agent and then subjecting the treated particles to a forming process involving heat and pressure. While the resulting particle board will generally release well from the caul plates of the press after forming, due to the effect of the internal release agent, it has been found that the ease of release is enhanced by precoating the surfaces of the caul plates or platens which come into contact with the particle board with a layer of polytetrafluoroethylene which layer optionally contains an internal release agent.
Claims8
In a process for the preparation of particle board wherein particles of material capable of being compacted are contacted with a polyisocyanate binder containing an internal release agent and the treated particles are subsequently formed into boards by the application of heat and pressure utilizing metal caul plates or platens, the imporvement which comprises enhancing the release of the finished particle board from the metallic surfaces which come into contact with said particle board during said application of heat and pressure, by precoating said metallic surfaces with a layer of polytetrafluoroethylene.
Dependencies are inferred from the claim text.