SOLVING A SLIMY PROBLEM by ProQuest

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A PPI SPECIAL REPORT

Ashland’s microbiological control technology has helped two
Canadian mills increase efficiency and improve quality




SOLVING A SLIMY PROBLEM

                             H
                                       oles, sheet breaks and myriad other sheet      in 2008. It produces 560,000 tonnes/yr of pulp that
                                       quality problems can be caused by dirty/       feeds two paper machines: PMs 3 and 4. PM 3, the
                                       clogged headboxes. Two Canadian mills,         focus of the work, produces 850 tonnes/day of white
                             Tembec, Temiscaming, QC, and Smurfit-Stone,              top liner. The machine was rebuilt in 1995; a mini-
                             La Tuque, QC, were looking for a way to alleviate        fourdrinier was installed on the top side to produce a
                             slime-related issues that necessitated frequent          two-ply sheet. The press configuration was changed
                             clean-outs.                                              with the addition of a shoe press. The mill also in-
                                 Tembec’s Paperboard Group’s (Temboard) mill          stalled a soft nip calender.
                             produces 180,000 tonnes/yr of various paperboard              While the mills faced different issues, both
                             grades used in lottery tickets, point of purchase dis-   opted for an Ashland Hercules Water Technologies
                             plays, cereal boxes, calendars, tobacco packaging and    microbiological control program using Spectrum
                             gum wrapper to name but a few.                           XD3899 ammonium bromide technology (see Pulp &
                                 The three-ply machine (PM 1) started up in 1989      Paper, November 2004, p. 45). Although this patented
                             and was rebuilt in 2002. All production is coated.       biocide has been used for many years by numerous
                                 The Smurfit-Stone mill celebrated its centennial     mills in the United States, Europe and Latin America,
                                                                                      it was only recently approved for use in Canada.

                                                                                      Pa r t o f t e m b o a r d ’ s c o n t i n u o u s
                                                                                      imProvement

                                                                                      Temboard mill manager Lori Kilgour said the
                                                                                      decision to use the biocide was part of the mill’s history
                                                                                      of continuous improvement. “We are always trying to
                                                                                      get better. We did have some cleanliness issues in the
                                                                                      headboxes and we were trying to solve that.”
                                                                                          Marc Gamache, wet end superintendent, explains
                                                                                      that the machine has top, filler and back ply headboxes.
                                                                                      Every three to five days, the machine was suffering
                                                                                      breaks because of stalactite-like accumulations dropping
                                                                                      into 
								
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