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Walter J. Rantanen
Technical Leader, Fiber Science
Appleton, WI
I. Fiber Defect
II. Sheet Defect
III. Machine Damage
• SWBK 66 47 • HWBK 254 151
• SWM 1 -Control Area
• SWBK 73 108
• HWBK 144 162Translucent
• SWBK 164 135
• HWBK 247 193
Clumped Area
• SWBK 45-47%
• HWBK 53-55%Control
• SWBK 58-60%
• HWBK 40-42%Defect
Damage to corrugation roll (severe)
Fiber clinging to corrugation roll flutes
Much of this fiber is in area of flute damage
Except for very slight improvement in Caliper & Basis Weight, no correlation for problem
Basis Weight, Caliper, Absorbency
Peel test (Did not easily release particles)
Sticky spots in Paper?
High Density spots in Paper?
Paper Medium flute fracture?
Paper Medium
U
W
Y
P
Problem
Yes
Yes
No
No
Observations
Large block-like Shives Present
Shive & particulate debris
Uniform Looking numerous Shives
Uniform Looking numerous Shives
Examination of Shive
Foil application with H2O
Some protrusion creation but not a clear cause
Rapid wetting did not release fiber
Chunks of fiber or resin clumps causing the
damage by getting lodged in the flute roof and
problem compounds with each revolution
Not accepted that fiber or hard shives could cause problem
Believe a harder particle is doing damage
Large size of shives, larger hard particles are a possibility
Running over a million feet of medium before the problem noticed
Proposal to attempt quantification of shive and/or large
particles
Use pulp lab equipment for
processing large sheets
Y 4x objective
Y 4x objective
P 4x objective
W 4x objective
W 4x objective
U 4x objective
U Stone-like 4x objective
U 4x objective Quartz Cross Polars
U 10x objective Glass
U 10x objective Glass Cross Polars
U 4x objective Resin Clump
Quartz
Glass
Big Polymer Pieces
Small Pebbles