Technique for manufacturing middle/high-density pressed-fibre board for direct printing

Abstract

The invention relates to a production technology of a medium and high density fibre panel, wherein, the medium and high density fibre panel can be used for direct printing, and the surface thereof is glabrous. The production technology has the working procedures of wood chip screening and washing, stewing, hot grinding, glue blending and spreading, drying, paving and molding, heat pressing, and cooling. The steam pressure when in stewing ranges from 0.70 to 0.80MPa, and the time is 2 to 5 minutes; molten refined wax, the quality of which is 0.9 to 1.1 percent of absolute dry fiber, is added when in hot grinding defibrination; the pressure in a grinding chamber is lower than the pressure in a stewing cylinder, wherein, the pressure of the stewing cylinder is 0.01 to 0.04MPa; in the work procedure of glue blending and spreading, urea-formaldehyde resin modified by polyvinyl alcohol and firming agent are added into the fibre; after the fibre is dried, the water ratio thereof ranges from 8 percent to 12 percent; before entering into a hot-press, parting medium which is 1ml to 2ml is sprayed onto the upper surface and the lower surface of a plate blank. The production technology has the advantages that by utilizing the technology to produce the fibre panel, the surface texture and the hydrolytic resistance of a plank stuff are improved, the surface processability of the fibre panel is increased, the printing effect of the fibre panel when in direct printing is increased, and the production cost of printing process is lowered.

Description

technical field [0001] The invention belongs to the technical field of artificial board production, and relates to a medium and high-density fiberboard production process with a smooth surface and can be used for direct printing. Background technique [0002] At present, the production process of medium and high-density fiberboard mainly includes log chipping (or purchased wood chips), wood chip screening and cleaning, cooking, hot grinding, glue mixing, drying, pre-pressing, hot pressing, sawing, cooling and other processes. The medium and high-density fiberboards produced in this way can only meet the requirements of ordinary fiberboards due to the conventional technical measures used in the cooking, hot grinding and sizing processes, and you can realize direct printing. With the rapid development of my country's economy and the improvement of people's quality of life, the processing methods of fiberboard have become diversified. The main processing methods of fiberboard ...

AI Technical Summary

Problems solved by technology

In recent years, with the advancement of continuous flat pressing production line technology and the improvement of the quality of fiberboard sheets, the process of printing various patterns on thin sheets using analog methods has become more common, but limited by the surface finish and water resistance of fiberboards, fiberboards The printing quality of direct printing is not good, and the printing cost is high, which hinders the in-depth development of fiberboard printing processing as a finishing method