Process for simultaneously heating and pressing modified hard wood by using steam and high frequency double heat source

Abstract

The invention relates to a process for simultaneously heating and pressing modified hard wood by using a steam and high frequency double heat source. The process is implemented through the following steps of: (1) cutting log rotatably into wood veneers, cutting the wood veneers into wood strips and drying the wood strips until the water ratio is 12 to 15 percent; (2) forcibly injecting water soluble phenolic resin solution into cell cavities of the wood strips by a vacuum pressing method and performing chemical modification process and gum dipping on the wood; (3) drying the modified and gum-dipped wood strips to control the water ratio to be within the range from 12 to 15 percent; (4) heating an upper hot pressing plate and a lower hot pressing plate of a press with steam during the pressing to increase the temperature of the surfaces of the plates to 140-145 DEG C, and simultaneously starting a high frequency machine to heat the interior of a blank, wherein the used pressure is 110 to 120kg/cm, the pressing time is 10 to 15min and the pressure is held for 10 minutes; and (5) sawing a rough edge plate to length after the rough edge plate is stored and cooled for 24 hours, and cutting the edges on the four sides to form a qualified product of consistent specification. The process is advanced and practical and can be applied to various fast-growing woods to realize batch production of high-specification modified hard wood.

Description

technical field [0001] The invention relates to the field of man-made panels, in particular to a process method for simultaneous heating and pressing of steam and high-frequency dual heat sources to modify hard wood. Background technique [0002] At present, in the field of man-made board manufacturing, the heat conduction parameter of wood is 1mm / min, and the required hot-pressing process time is determined according to the thickness of the pressed board. This conventional hot-pressing process parameter is due to the hot-pressing time when pressing thickened boards. If it is too long, the mechanical properties of the surface layer and the core layer of the board will be very different, and the production efficiency will be very low. The hourly unit pressure needs to be 500kg / cm 2 Above, the specification of hard wood is limited to 2500×160×110mm, conventional hot-pressing process and cold-pressing and heat-curing process cannot realize mass continuous production of thicken...

AI Technical Summary

Problems solved by technology

[0002] At present, in the field of man-made board manufacturing, the heat conduction parameter of wood is 1mm/min, and the required hot-pressing process time is determined according to the thickness of the pressed board. This conventional hot-pressing process parameter is due to the hot-pressing time when pressing thickened boards. If it is too long, the mechanical properties of the surface l