Respiration type pressurized drying method for rotary cut veneer, and production method for solid-wood composite floor

Abstract

The invention relates to a respiration type pressurized drying method for a rotary cut veneer, and a production method for a solid-wood composite floor. The respiration type pressurized drying method for the rotary cut veneer comprises the steps of: placing the rotary cut veneer in a pressure drying machine at a temperature of 100-240 DEG C, and repeating the following respiration type pressurized drying process till the water content of the rotary cut veneer is lowered to be 3% or below; applying a pressure of 0.1-3MPa to a core layer by a hot-pressing plate, maintaining the pressure for 10-40s / (mm being the unit of the thickness of the core layer) and then lifting the hot-pressing plate, and then applying a pressure to the core layer by the hot-pressing plate after 5-40s / (mm being the unit of the thickness of the core layer). The rotary cut veneer dried by the method is basically stress-free inside, low in warping degree and high in flatness, and has a smooth and flat surface. The production method for the solid-wood composite floor comprises the steps of: drying a rotary cut veneer which serves as a core layer according to the abovementioned respiration type pressurized drying method till the water content is smaller than or equal to 3%, and then carrying out gluing, assembly, compression moulding, and tenon and notch forming on the core layer and other layers that form the solid-wood composite floor. The solid-wood composite floor produced by the method is low in warping degree, high in flatness, and low in glue consumption.

Description

technical field [0001] The invention relates to a pressure-drying method of a rotary-cut veneer and a method for preparing a solid wood composite floor by using the pressure-dried rotary-cut veneer. Background technique [0002] The preparation method of the solid wood composite floor mentioned in the reference is that the various layers of panels that make up the solid wood composite floor are glued, assembled, hot-pressed or cold-pressed and glued, and then secondary processing such as tenoning and surface painting are performed. of. [0003] With the improvement of wood rotary cutting technology, the thickness of the current rotary cut veneer should be increased from the original 1-4mm to the current 6-14mm. Due to the reduction in the number of rotary cuts for wood sections, the use of wood can be greatly saved. However, The problems that often occur in the process of preparing the floor for the thick veneer produced by rotary cutting are: [0004] (1) Due to the prese...

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the presence of cracks on the back of the veneer, the difference between the front and back of the thick core veneer is relatively large. During the process of hot pressing and heating, the stress cannot be released, causing the board to be prone to defects such as warping and twisting;

[0005] (2) Thick veneer tends to produce more burrs and grooves during the rotary cutting process. In the process of gluing, a large amount of glue is needed to fill the burrs and grooves, which will cause a lot of waste of glue and the amount of sizing on the front and back sides Unequal phenomenon, after hot pressing, it is easy to cause asymmetry on the front and back sides, resulting in warping, bending and even degumming defects;

[0006] (3) Thick veneer itself is prone to warping during the drying process, and it is easy to cause fracture in the subsequent process, affecting the integrity of the veneer

[0007] In order to solve these problems, the currently commonly used solutions are mainly to slot the front or back of the veneer through the veneer softening technology, and reduce the integrity of the veneer (that is, the entire veneer is divided into multiple veneers) and other methods. To reduce the stress, the deformation of the veneer can be controlled by means of hot plate or pressure drying (such as mesh belt compression), but the thermal stress generated in the subsequent hot pressing process cannot be completely released.

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