OPENING THE OPERATING WINDOW OF IMPULSE DRYING: III. CONTROLLED DECOMPRESSION EXPERIMENTS

摘要

Recent Institute research has shown that changes in the nip opening process can significantly impact sheet delamination during impulse drying. Empirical evidence shows that by opening the nip to ambient pressures in excess of one atmosphere delamination can be avoided. While this method may prove to be practical, methods that were easier to implement are being sought.Further experimental work showed that by properly controlling the load applied to the sheet as the nip opens sheet delamination could be inhibited. The experiments identified nip opening load conditions that were sufficient to suppress the delamination of 205 g/m~2 linerboard handsheets, having a freeness of 400 ml CSF at 35% ingoing solids.