Technique for producing medium density fiberboard by using modified bulrush

Abstract

The present invention relates to a process method for manufacturing a medium density fiberboard from modified reeds. A whole reed plant is cracked and cut, reed leaves, reed paintings, reed ears, reed flowers and flute diaphragms are all selected out by winnowing and the rest reed stalk which is called reed chipping serves as a raw material. Dry fibers are produced after the modification, defibration and drying by hot air (smoke) of the reed chipping. The dry fiber is metered and quantitative powder adhesives and assistant agents are added. Then the dry fiber is spread on a spreading machine as a prepressed slab of the medium density fiberboard. A rough medium density fiberboard is produced after the pressing and hot pressing of the slab and becomes a qualified medium density fiberboard after a final treatment processing. The present invention is characterized in that the technique method solves the problem of making medium density fiberboard from reeds and powder adhesives and enlarges the raw material resource of medium density fiberboards.

Description

technical field [0001] The invention relates to a method for manufacturing medium-density fiberboards, in particular to a process for manufacturing medium-density fiberboards from modified reeds. Background technique [0002] Phragmites reed is a perennial herb with salt-alkali tolerance. It mostly grows in low-lying water areas, and the aboveground part is annual. Reed stalks are rich in wood fiber, the content of which is equivalent to that of wood, and are high-quality raw materials for wood-based panels. Our country produces 10 million tons of air-dried reeds annually. At present, 50% of the paper consumption is consumed, and other industrial uses have not been developed. Some of them rot year after year, which not only wastes resources but also pollutes water bodies. [0003] The chemical composition of reed fiber is shown in Table 1 and Table 2. It can be seen from Table 1 and Table 2 that the content of reed fiber is high, and the ash content and solution extract are...

AI Technical Summary

Problems solved by technology

However, the ash content of reed fiber is 2.5 times that of bagasse and 4-12 times that of wood, and the main component in ash is silicon dioxide (SiO2). 2 ), and form a hard wax layer with fatty substances. It is a non-polar substance, has poor wettability, low surface free energy, and is less than 50% of wood, making it difficult for water-soluble adhesives (granule powder glue) to penetrate. The low bonding strength of reeds, especially the internal bonding strength is lower than the national standard, which restricts the development and utilization of reeds