Method for producing bamboo fibre artificial board without glue glued adhesion

Abstract

The present invention relates to a production method of self-bonding artificial bamboo fibre board, which includes the following technical processes: (1) bamboo particles, (2) high-temperature steam softening, (3) hot grinding, (4) drying, (5) the spraying of additive, (6) the spreading of material, (7) prepressing, (8) hot pressing, (9) the releasing of a board, (10) cooling, and (11) a finished product. Moreover, in the process of high-temperature steam softening, a softening method of gradually increasing temperature and pressure and momentarily decreasing pressure is applied; in the softening method, the bamboo particles with a water ratio less than 18 percent are loaded into a sealable pressure container, the temperature-increasing rate is controlled within 60 DEG C per hour, when the temperature is raised to 130 DEG C, the pressure is controlled at more than 0.4Mpa, and the temperature and the pressure are maintained for over one hour; later, a steam valve is opened, and the pressure is rapidly decreased to zero, and the pressure-decreasing period is controlled within three hundred and sixty seconds. Consequently, the condensation degree of condensed water can be decreased, the discharging quantity of the condensed water and the loss of carbohydrate and lignin degradation products in the discharging process can be reduced, the bamboo fibres can be sufficiently inflated and rapidly separated, the rate is increased, the concentration of free radical is increased, and the high-strength bonding requirement is satisfied.

Description

technical field [0001] The invention relates to a production method of glue-free glued bamboo fiber-based panels. Background technique [0002] The production method of glue-free wood-based panels has been studied at home and abroad. In the full-text database of doctoral dissertations in China, the 2002 doctoral dissertation "Research on the Manufacturing Process of Glue-free Wood-based Panels" written by Jin Chunde of Northeast Forestry University , elaborated the manufacturing process of glue-free plywood, and cited literature, especially the glue-free plywood made of wood, which has been widely used in production. The main production methods are: crushing → high temperature steam softening → hot grinding Adding additives→drying→laying materials→prepressing→hot pressing→unloading→cooling→finished products; but in this paper, it is not clearly proposed to use bamboo to process glue-free plywood, only proposed to use bamboo chips The preliminary research on the material boa...

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Problems solved by technology

[0002] The production method of glue-free wood-based panels has been studied at home and abroad. In the full-text database of doctoral dissertations in China, the 2002 doctoral dissertation "Research on the Manufacturing Process of Glue-free Wood-based Panels" written by Jin Chunde of Northeast Forestry University , elaborated the manufacturing process of glue-free plywood in detail, and cited literature, especially the glue-free plywood made of wood, which has been widely used in production. The main production methods are: crushing → high temperature steam softening → hot grinding Adding additives→drying→laying materials→prepressing→hot pressing→unloading→cooling→finished products; but in this paper, it is not clearly proposed to use bamboo to process glue-free plywood, only proposed to use bamboo chips Preliminary research on the material board, the test method is: crushed material→screening→activation→humidity adjustment→pavement→pre-pressing→hot pressing→sawing→finished product, and this method, also pointed out in the paper, through this method, the edge of the slab is easy to scatter after paving, and there is basically no interweaving between the scraps inside the slab, which greatly affects the effect of the slab and the performance of the slab after the slab is formed

Obviously, this will lead to low strength of the finished board

And if above-mentioned wood is made the production method of glue-free glued wood-based panel fully applied to bamboo, also there is improper part, as the sweeping rate of bamboo fiber is low, the free radical concentration of bamboo fiber is low, does not meet the gluing requirement, reason is that The density, hardness, fiber bundle structure and cell structure of bamboo fiber are very different and different from those of wood.