SU389952A1 - - Google Patents

Description

METHOD OF MANUFACTURE OF WOOD-FIBER PLATES

one

The invention relates to the woodworking industry, namely the production of fibreboard.

Methods are known for producing fiberboard by grinding chips, sizing pulp, molding, hot pressing, heat treatment and conditioning of finished plates.

The disadvantages of the known methods are the large (over 30-50 m-per ton of slabs) fresh water consumption for the dilution of the mass after secondary grinding before forming the carpet and for the mesh casting of the casting machine; the presence of a correspondingly large amount of hardly purified wastewater saturated with organic matter of wood and sizing materials.

The strong dilution of the mass in front of the drain mask is caused by the need to ensure the mobility of the fibers in the aquatic environment and thereby create favorable conditions for the formation of a uniform ravine structure during the formation of the slab.

The purpose of the invention is to reduce the water consumption in the process and reduce the amount of sizing materials introduced into the mass.

This is achieved by the proposed method of making slabs from a pulp with a concentration of 2.5-4% undiluted after secondary grinding, and the formation of a carpet from such a mass is carried out by subjecting it to vibrational vibrations. Vibration, by breaking bonds between the fibers in thick aggregates (lumps), imparts additional mobility to the fibers, and a flow property to the fibrous mass, which ensures the required conditions for carrying out the process of forming the carpet of the slab. The carpet forming process is carried out on a grid of a continuously operating vibrating table.

The drawing is a process flow diagram of the proposed method.

Accepted designations: 1 - the first step of grinding chips; 2 - the second step of grinding wood pulp; 3 - forming vibratory device of the casting machine; 4 - suction boxes; 5 - wet machine presses; 6 - mountain press; 7 - quenching and cooling equipment (chambers).

The method is carried out as follows.

After the first and second stages of grinding and

Introducing into the grinding aggregates of microgluing materials a pulp with a concentration of 2.5–4% without dilution is fed to a continuously operating vibrating table 3 of the casting machine, where a carpet is formed on an endless grid.

The formed goat is dewatered on the aspirators 4 and in the wet presses 5 of the casting machine and sent to a hot press 6. After the hot press, the plates are heat treated and moistened in the chambers 7.

Subject invention

Production method of wood fiber plkgt - by grinding wood chips, - gluing pulp, molding, hot pressing i | e | 8 tliL

Heat treatment and conditioning of finished plates, characterized in that, in order to reduce water consumption in the technopic process, reduce the amount of wastewater and reduce the consumption of sizing materials, the molding is carried out from a pulp with a concentration of 2.5-4% undiluted after secondary grinding, and at the time of formation of the iKOBpa mass is subjected to vibration.