Production method and production device for formaldehyde-free type medium-density fiberboard

Abstract

The invention discloses a production method and a production device for a formaldehyde-free type medium-density fiberboard. The production device comprises a spreading machine, a pre-pressing machine, a hot press, a cold-pressing rolling machine, a diagonal saw, a first roller conveyor, a jitter conveyor, a plate cooler, a sanding machine, a plate cutter and a stacking machine which are sequentially arranged from front to rear in a base material motion direction, and further comprises a belt conveyor, a heating room, an air-inducing fan, a first fan and a second fan; and the spreading machine, the pre-pressing machine and the belt conveyor are positioned in the heating room. The production method comprises the following steps of: wood stripping and chipping, fiber preparing, waterproof agent and adhesive applying through fibers, fiber drying, fiber paving, fiber raw slab pre-heating, pre-pressing, hot-pressing, plain plate rolling, plain plate jittering and plain plate processing, wherein the adhesive applied by the fibers is formaldehyde-free polyisocyanate adhesive. According to the production method and the production device disclosed by the invention, hot-pressing time can be shortened by 10%, a plain plate curing process is cancelled, the production period is quickened, and production cost is reduced.

Description

technical field [0001] The invention relates to a production device of formaldehyde-free medium density fiberboard and a production method of formaldehyde-free medium density fiberboard. Background technique [0002] Medium density fiberboard is a kind of man-made board made of wood fiber or other plant fiber as the main raw material, prepared by fiber, applied with adhesive, dried and hot pressed. Most of the adhesives used in medium density fiberboard are urea-formaldehyde resin glue, which inevitably has the problem of formaldehyde release. In recent years, the problem of air pollution has attracted public attention, especially with the development of my country's economy and the improvement of people's living standards, the demand for indoor materials is increasing, and the resulting indoor air problems are also increasing. more attention. Indoor air quality is very important to the life and health of the public. It is particularly important to control indoor pollution ...

AI Technical Summary

Problems solved by technology

For the production of formaldehyde-free medium density fiberboard, the first choice for industrial production is to use isocyanate adhesive instead of urea-formaldehyde adhesive to produce fiberboard. The amount of isocyanate adhesive applied is 4% to 8% of the dry fiber, which brings two other problems at the same time. One is that the curing time of isocyanate glue is longer than that of urea-formaldehyde glue, which is generally about 5% to 10% longer, and the hot pressing time per mm board is 12 to 14s; the other is that the isocyanate adhesive is mixed with release agent and accelerator The total agent is more than twice as expensive as the urea-formaldehyde adhesive, reaching an increase of about 280 yuan per cubic meter, and the fiber consumption is also increased by about 50 yuan per cubic meter; Under high-pressure pressing, due to the difference in temperature gradient and moisture content gradient inside the plain board, huge internal stress has accumulated. After the hot-pressed plain board is cooled to a certain temperature, it will be stacked by an automatic stacker and sent to the intermediate warehouse for storage. , the health-preserving period of the plain plate is more than 48 hours, which greatly increases the production and operation costs of the enterprise

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