Production method and production device of formaldehyde-free medium density fiberboard

Abstract

A production method and production device for formaldehyde-free medium density fiberboard, including a paving machine, a pre-pressing machine, a hot press, a cold-pressing rolling machine, a diagonal saw, and a first A roller conveyor, a shaking conveyor, a cooling machine, a sander, a cutting machine and a stacker, and also includes a belt conveyor, a heating chamber, a draft hood, a first fan and a second fan; The press and belt conveyor are located in the heating chamber; the production method includes: wood peeling and chipping, fiber preparation, fiber waterproofing and adhesive application, fiber drying, fiber laying, fiber blank preheating, pre-pressing, hot pressing , plain plate rolling, plain plate shaking, and plain plate treatment; the adhesive applied to the fiber is formaldehyde-free isocyanate glue; the invention can shorten the hot pressing time by 10%, cancel the health-preserving process of the plain plate, and speed up the production cycle , reducing production costs.

Description

technical field [0001] The invention relates to a production device of aldehyde-free medium density fiberboard and a production method of aldehyde-free medium density fiberboard. Background technique [0002] Medium density fiberboard is a kind of artificial board made of wood fiber or other plant fiber as the main raw material, prepared from fiber, applied with adhesive, dried and hot pressed. At present, most of the adhesives used in MDF are mainly urea-formaldehyde resin adhesives, and there must be a problem of formaldehyde release. In recent years, 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 indoor air problems caused by this are also becoming more and more serious. more attention. Indoor air quality is very important to the life and health of the public. It has become particularly important to control indoor...

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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