Microscopical analysis to facilitate problem solving in the paper industry
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Transcript of Microscopical analysis to facilitate problem solving in the paper industry
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Walter J. Rantanen
Technical Leader, Fiber Science
Appleton, WI
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I. Fiber Defect
II. Sheet Defect
III. Machine Damage
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• SWBK 66 47 • HWBK 254 151
• SWM 1 -Control Area
• SWBK 73 108
• HWBK 144 162Translucent
• SWBK 164 135
• HWBK 247 193
Clumped Area
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• SWBK 45-47%
• HWBK 53-55%Control
• SWBK 58-60%
• HWBK 40-42%Defect
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Damage to corrugation roll (severe)
Fiber clinging to corrugation roll flutes
Much of this fiber is in area of flute damage
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Except for very slight improvement in Caliper & Basis Weight, no correlation for problem
Basis Weight, Caliper, Absorbency
Peel test (Did not easily release particles)
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Sticky spots in Paper?
High Density spots in Paper?
Paper Medium flute fracture?
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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
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Examination of Shive
Foil application with H2O
Some protrusion creation but not a clear cause
Rapid wetting did not release fiber
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Chunks of fiber or resin clumps causing the
damage by getting lodged in the flute roof and
problem compounds with each revolution
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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
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Proposal to attempt quantification of shive and/or large
particles
Use pulp lab equipment for
processing large sheets
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Y 4x objective
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Y 4x objective
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P 4x objective
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W 4x objective
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W 4x objective
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U 4x objective
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U Stone-like 4x objective
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U 4x objective Quartz Cross Polars
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U 10x objective Glass
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U 10x objective Glass Cross Polars
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U 4x objective Resin Clump
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Quartz
Glass
Big Polymer Pieces
Small Pebbles