B - Operations – Transporting – 27 – N
Patent
B - Operations, Transporting
27
N
B27N 3/12 (2006.01) B27N 3/00 (2006.01) B27N 3/08 (2006.01) B29C 43/56 (2006.01) B29C 43/58 (2006.01) B29C 43/22 (2006.01)
Patent
CA 2450281
A method and system for pressing lignocellulosic and/or cellulosic materials to produce composite products such as medium density fiberboard subjects a mat of material to a alternating or vibratory force normal to the top face of the mat. The frequency of the alternating forces may be between 0.2 Hz and 2Hz. This vibratory pressing action serves to cause heat to be transferred more quickly to the core of the mat from the surface, and reduces the pressing time required for thermosetting resins within the mat to cure. The system has a press for accepting the mat; a temperature sensor for sensing the temperature of the core of the mat; a control system for accepting a first signal from the temperature sensor and in response to that signal causing the press to apply vibratory forces to the mat normal to the surface of the mat when the core of the mat is below a predetermined temperature. The control system is also programmed to cause the press to apply a non-vibratory force to the mat normal to the surface of the mat when the core of the mat is above a predetermined temperature, that temperature being within the range of temperature at which the resin in the mat is capable of curing.
Deng Xixian
Xie Yongqun
Forintek Canada Corporation
Fpinnovations
Oyen Wiggs Green & Mutala Llp
LandOfFree
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