Measures to solve the central crack in the drying process of veneer hot press

During the operation of veneer hot press, the positive pressure in this area is slightly larger, the temperature difference is higher, and the humidity is also higher. In this way, the green body is easy to be evenly heated and the temperature rises rapidly, but the moisture removal and drying is not rapid, and the strength of the green body increases rapidly, so the problem of central crack is easy to solve.

Remove the sundries such as rotten bricks, dust and crushed stone cotton remaining in the drying kiln to ensure smooth air circulation in the kiln and prevent too much local heat storage or low temperature. In particular, the intermediate crack is easy to form after the drying heating branch gate is blocked by sundries at the air inlet. Appropriately reduce the total dehumidification capacity of the dehumidification fan, or appropriately reduce the opening of the dehumidification branch gate in the front section, so that the drying inlet is in a micro positive pressure state, and increase the flue gas temperature and humidity in the speed-up stage. Open the cold air port on the exhaust air duct of the kiln to increase the flue gas humidity sent to the drying section.

Appropriately reduce the temperature in the constant speed drying stage and keep the temperature in the rising speed stage unchanged. The veneer hot press production line makes the green body dry and shrink slowly in the constant speed stage. Open the smoke exhaust branch gate of the first row of the kiln, and correspondingly turn down the branch gates close to the first and second rows behind the firing section, so as to increase the humidity of the flue gas sent to the drying section and keep the total amount unchanged.

Keyword: veneer hot press

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