Manufacturing technique for mildew resistant middle, high-density pressed-fibre board

Abstract

The invention belongs to the technical field of artificial board production. The technical proposal comprises the working procedures of wood chip screening and washing, stewing, hot grinding, glue blending and spreading, drying, paving and molding, heat pressing, and cooling. Mildew preventive is directly added in glue solution which is used during the glue blending and spreading, the weight of the mildew preventive is 0.1 to 0.2 percent of the glue solution; then ammonium sulphate which is used as a firming agent is added in, wherein, the weight of the ammonium sulphate is 3 to 4.5 percent of the glue solution, and the concentration is 20 to 30 percent; urea liquid which is used as buffer solution is added in, wherein, the weight of the urea liquid is 1.5 to 2 percent of the glue solution, and the concentration is 20 to 30 percent; the pH value of mixed liquid cement is adjusted to 7.0 to 8.0 by using sodium hydroxide solution the concentration of which is 20 percent, and the mixed liquid cement is used within 30 minutes; the modulated mixed liquid cement is added into fibre to be dried together before the fibre is dried; in the heat pressing stage, the heat pressing temperature is controlled between 170 to 190 DEG C, the heat pressing factors are 8 to 10s / mm, the plank stuff density is controlled between 850 to 870<3>. A medium and high density fibre panel which is manufactured in the invention is led to have mildewproof effect through adding with the mildew preventive, thus the service life of the plank stuff is prolonged, and the application range of the plank stuff is enlarged.

Description

technical field [0001] The invention belongs to the technical field of artificial board production, and in particular relates to a production process of mildew-resistant medium and high-density fiber boards. 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. With the improvement of people's living standards, people have widely used medium and high-density fiberboards in house decoration, but because wood fibers are prone to fungi in humid environments, mildew of the boards is caused under suitable environmental factors, making them The decline in mechanical properties and the more serious pollution of the living environment also limit the use of fiberboards. Contents of the invention [0003] The production process of the env...

AI Technical Summary

Problems solved by technology

With the improvement of people's living standards, people have widely used medium and high-density fiberboards in house decoration, but because wood fibers are prone to fungi in humid environments, mildew of the boards is caused under suitable environmental factors, making them The mechanical properties are reduced, and more seriously, the living environment is polluted, which also limits the use of fiberboards.