NexShield™

A mill had deposition issues on both the paper machine’s center press rolls, the smoothing press roll, Uhle box covers, and dryer felt rolls. The mill used talc in its purchased HWK system to control these issues but wanted to eliminate its use due to the handling issues and the growing health concerns about talc inhalation.

NexShield™ replaced the talc treatment. The product was fed into the dry fiber pulper and, after refining. Photographic records documented the center press roll, smoothing press roll, and sheet side dryer felt rolls becoming noticeably cleaner over time. The program cost was comparable to the talc program cost while eliminating the talc handling and health concerns. A data analytics platform analysis verified no adverse changes in ZDT, wet-end charge, surface defects, tray solids, or silica usage.

A tissue and towel customer making white and brown towel with 45-100% recycled fiber wanted to utilize a less expensive fiber blend while minimizing stickies deposition on the machine. Historically, stickies have deposited on the TAD fabric and sheet side rolls to the degree that prevented using this fiber blend.

DuBois’ NexShield™ X102 pitch and stickies control technology was applied to the recycled stream before the blend chest at 2.5 lb. per ton produced. As a result of the program, deposition was minimized, allowing for normal operation with increased recycled fiber use. The savings was many times greater than the cost of the program.

A Kraft mill was looking for a better solution for pitch control in its sawdust pulping line. The mill utilized a pitch dispersion product but was unhappy with the results. Pitch coupons were employed to monitor deposition. The deposition on the high-pressure screens was also visually inspected to reflect system conditions.

DuBois recommended replacing the current dispersant with our NexShield™ P103 product. NexShield™ P103 was applied to the brown stock washers at 1.0 lb/ton and the brown stock high-density pump at 0.6 lb/ton. The pitch control improved significantly due to the program. The pitch coupon installed at two locations showed a reduction in deposition. The high-pressure screens were removed during an outage two months after the program began and indicated a notable decrease in deposition. Pitch extractive levels were reduced to an average of less than 0.2 grams per day on the coupon surface.