2013 international conference on - forest products … international conference on wood adhesives...

2013 International Conference on2013 International Conference on Wood Adhesives

Coefficient of Static Friction between Resinated Strands and N i t d St d d Diff t C t t PNon‐resinated Strands under Different Contact Pressure

Ying Li (Ingrid) Tsai Trueman Lam Gregory D SmithYing‐Li (Ingrid) Tsai, Trueman Lam, Gregory D. SmithUniversity of British [email protected]

Greg Smith@ubc [email protected]

Wood‐Based Composites Center

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Wood Based Composites CenterNSF Industry/University Cooperative Research Center

Outline

1 B k d1. Background 2. Materials3 D i f E i3. Design of Experiment4. Results5 C l i5. Conclusions6. Future work

International Conference on Wood Adhesives, October 9‐11, 2013

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Background 1g

Industrial blender(Smith, 2005)


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Background 1g



4Lab blender

Background 1g



5Lab blender Lab blender simulation

Background 1g

Industrial blender Industrial blender simulation(Smith, 2005)



Background 2Coefficient of Static Friction (COFs)Coefficient of Static Friction (COFs)


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Background 3Coefficient of Static Friction (COFs)

Goal:

Coefficient of Static Friction (COFs)

Goal:

Determine the COFs between strands and drum liner and flight surfaces.

Boom

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1 Surface texture of strands1. Surface texture of strands

2. Effect of resin on strand surfaces

3 Contact pressure on strands3. Contact pressure on strands


Flight9

Material 1

1. Sliced Aspen veneerL= 235 mm

W= 32 mm T= 0.78 mm

2. Mill run face strands from the Weyerhaeuser Edson, AB OSB plant.

L = 87.4 mmW = 14.2 mmT = 0 66 mm

25.4 mm


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T = 0.66 mm

Material 2

• High density polyethylene (HDPE) HDPE piece is trimmed from the flights.

105 mm

• Phenol formaldehyde (PF) face resin

240 mm 12 mm

• Phenol formaldehyde (PF) face resin From Momentive Specialty Chemicals Canada

Inc. The resin solid content is 58%.


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Design of Experiment 1 Surface texture of strandsSurface texture of strands


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Design of Experiment 2Effect of resin on strand surfacesEffect of resin on strand surfaces

1. Resin effect– No resin– 6 % PF resin

2. Surface texture– Strand‐Strand

• ( )

• ( )

• ( )• ( )– Strand‐HDPE

• ( )Metal Blender for spraying resin.1 5 m in diameter 0 61 m in length


( )

• ( )13

1.5 m in diameter, 0.61 m in length.

Design of Experiment 3Contact pressure on strandsContact pressure on strands

Force is applied to the surface of strands.


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Result 1Surface texture of bare strandsSurface texture of bare strands

X 22

X 16N=5

X 16Surface texture under microscope.

1. The COF between strands are higher than the COF between strand and HDPE.2 There is no significant difference between strands in three combination


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2. There is no significant difference between strands in three combination.3. There is no significant difference between strand and HDPE in two combination.

Result 2Effect of resin on strand surfacesEffect of resin on strand surfaces

N=5

Coefficient of friction between strands with resin has higher COF than the one


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without resin.

Result 2Effect of resin on strand surfacesEffect of resin on strand surfaces

In feed chute0 % resin

Detachment Angle

I t A lImpact Angle

Out feed chute6 % resin


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Result 3Contact pressure on strandsContact pressure on strands

N=5N 5

0% resin


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COF between strands decreased significantly when the contact pressure was less than 375 Pa.


N=5N 5

6% resin

0% resin


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COF between strands with resin did not change with increased contact pressure.


N=5

0% resin

COF between strand and HDPE didn’t change a lot as the contact force increases.


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6% resin

N=5

0% resin

COF between strands remained constant at pressure higher than 375 Pa.


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Conclusions

1. COF between strands is higher than COF between gstrand and HDPE.

2. Coefficient of friction between strands with resin h hi h COF th th ith t ihas higher COF than the one without resin.

3. There was no significant increase in COF between resinated strand surface and HDPEresinated strand surface and HDPE.

4. COF between strands decreased significantly when the contact pressure was less than 375 Pa and premained constant at higher pressures.


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Future Work

(Smith, 2005)

Goal: Create a Discrete Element Model Detachment AngleCreate a Discrete Element Model that simulates strand breakage in a rotary drum blender. Impact Angle


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Acknowledgements g

Wood‐Based Composites CenterNSF Industry/University Cooperative Research Center

Thank you


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Greg Smith: [email protected]‐Li (Ingrid) Tsai: [email protected]

2013 international conference on - forest products … international conference on wood adhesives...

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