Steam, fibre and resin dynamics within a medium density fibreboard (MDF) blowline

摘要

The effects of blowline steam velocity, resin injection nozzle type and position were determined by injecting fluorescently labelled urea formaldehyde resin into a blowline and examining the resin distribution on the fibre using confocal microscopy. The key results are: 1. Pressure drop within the blowline is 2.5 times greater with fibre present (normal operation) than for steam only. 2. Resin coverage increases with greater steam flow through the blowline. 3. Resin coverage decreased when the resin injection nozzle was shifted from the conventional position after the blow valve to the end of the blowline. 4. Resin coverage increases if emulsified wax is mixed with the resin prior to injection. 5. The blowline steam flow and resin injection position have a greater effect on the resin coverage than the nozzle type for the blowline used.