heating principle of the hot press
The heating principle of the hot press
During the hot pressing process of wood-based panels, the glue solution in the supply slab is activated
The heat comes from the heating system, and its heat source is a boiler or a thermal energy plant,
The heating medium is generally dielectric, steam or thermal oil. heating fuel
It is mainly waste from the production of wood-based panels, such as board skin, wood chips, substandard
Grid plate, sanding powder, etc.; the generated heat is used for hot pressing of wood-based panels,
It is also used for drying raw materials (such as veneer, fiber, shavings)
or cooking of wood chips.
When the hot pressing plate heats the slab, the heat is transferred through contact heat transfer
to the slab, and penetrate into the slab to promote the flow of glue and gradually solidify
When the glue is completely cured, the hot pressing process of the board is completed. reason
Theoretically speaking, the heat press machine in different time periods in a heat press cycle,
The heat required for the activation and curing of the glue solution is different, but the single layer,
Multi-layer heat press and continuous roller heat press due to adjustment of heat platen or heating
The temperature of the roller (essentially to control the temperature of the heating medium) is not very convenient,
Therefore, the slab is heated at a constant temperature; while the continuous belt hot press can
A method of setting multiple hot-pressing plates and setting different temperatures on each hot-pressing plate
The method makes the distribution of heat more scientific, so the quality of the plates it produces
better.
The hot press pressurizes and heats the slab between the two processes
are parallel and interact with each other. The reason why the hot press pressurizes the slab
To be divided into different sections (i.e. to pressurize according to the pressure curve), the original
Because the main reason is that when heating, as the heat penetrates into the slab, the glue will open
Beginning to solidify gradually, the rebound force of the slab gradually decreases. Pressurize at this time
The force needs to be adjusted in time so that the final pressed board conforms to the product
Density and thickness requirements
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