Holes, sheet breaks and myriad other sheet quality problems can be caused by dirty/clogged headboxes. Two Canadian mills, Tembec, Temiscaming, QC, and Smurfit-Stone, LaTuque, QC, were looking for a way to alleviate slime-related issues that necessitated frequent clean-outs. While the mills faced different Issues, both opted for an Ashland Hercules Water Technologies microbiological control program using Spectrum XD3899 ammonium bromide technology. Although this patented biocide has been used for many years by numerous mills in the US, Europe and Latin America, it was only recently approved for use in Canada. The cleanliness of the machine was perhaps the most noticeable difference to the crews. They said they had never seen the machine so clean. Previously, the mill performed a once-a-shift cleaning of the saveall. If this was not performed, the saveall would be very pink, a sign of microbiological growth.
chemicals 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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