Two-Sided Drainage Handsheet Machine, PaperCon 2010 Conference

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A new Two-Sided Drainage Handsheet Machine (TSDHM) was developed and compared with the Standard British Handsheet Machine. The results show that fines and filler distribution in handsheets produced in the one-sided drainage mode by the TSDHM closely mimics the fines and filler distribution of the Standard British Handsheet Machine. By reversing the drainage on the TSDHM from the classical 100 % bottom to 100 % top, the fines and filler profiles in the handsheets can be reverted. The two-sided drainage mode on the TSDHM can produce fines and filler profiles across the paper thickness that are completely different from the one-sided drainage mode. These profiles are more representative of the top and twin-wire formers.