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Improvements Through Material DevelopmentENGINEERED ELASTOMERIC MATERIALS
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
AGENDA
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What Is Rubber?
Dual Durometer Cover
Summary
Single Durometer Cover
Hybrid Material Cover
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
• Rubber is a spring– Governed by the same laws of
vibrations, dynamics, and physics as a coil spring would be
– F=k*x• F = Force• k = spring rate (think of durometer)• x = displacement/deflection
– For a linear spring, durometer is analogous to spring rate
WHAT IS RUBBER?
X
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
• Based upon usage on a roll, a rubber cover acts like a compression spring– Common types of compression springs
• Linear/Constant• Progressive• Progressive with knee• Degressive• Dual Rate
• Just like there are multiple types of springs, there are many types of rubber covers
• The demands/requirements of the process will determine the type of spring needed
WHAT IS RUBBER?
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
• Durometer affects the characteristic– Acts either like linear spring or slightly
progressive
• General roll applications– Most processes will work fine with a single
layer of a constant durometer material– Consistent web material
• Durometer is varied for process control
SINGLE DUROMETER COVERCharacteristics
SINGLE DUROMETER COVERMultiple Durometer Comparison
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
80 Durometer60 Durometer40 Durometer
Forc
e
Displacement
• Characteristics are consistent throughout the material
• Transitions will occur when loads increase to the point where the core starts to influence the spring rate– Compared to an elastomeric material the core has an
infinite spring rate– Cover thickness needs to be adjusted so the desired
influence is achieved
SINGLE DUROMETER COVEROverview
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
DUAL DUROMETER COVERCharacteristics
• Acts like a linear spring with knee• General roll applications
– Used primary when large variations in web thickness occur– Process requires the ability to change between spring rates with small
changes in displacement
• The ratio of thicknesses are used to control the desired effective rate
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
Soft Rate Firm Rate
DUAL DUROMETER COVEROuter Cover Thickness Variation
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
Displacement
Forc
e
• Test was conducted with a cover thickness such that the effects of the core were not introduced
• All samples had the same initial spring rate to the same displacement– The cover thickness only effected the spring rate after
the transition point• For thin covers, the difference in ratio
performances will mean that a process might not be able to handle a lot of wear or regrinds
DUAL DUROMETER COVEROverview
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
HYBRID MATERIAL COVERCharacteristics
• Hybrid materials are a combination of compounds mixed to provided customized characteristics
• Multiple compound options– Can be compounded to act like a Dual Durometer or even
a variable durometer cover– Different elastomeric materials can be combined to adjust
for physical, chemical, or exposure requirements
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
HYBRID MATERIAL COVER
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
Displacement
Forc
e
• Advantages of Engineered Materials– The “knee” in the spring rate can be customized to
meet different applications– The characteristics are homogeneous throughout the
material– The roll is able to be reground without effecting the
rate characteristics unlike a Dual Durometer
HYBRID MATERIAL COVEROverview
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
SUMMARY
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
• There are an unlimited amount of options when it comes to rubber coverings.– Not limited by single durometers or even
dual durometers• Your process might not lend itself to a
standard material, but there is a material that can be formulated for it!
THANK YOU!
© ABBA Roller, LLC, 2012—Presented at AIMCAL 2012 Technical Conference
Contact InformationDevin FrostABBA [email protected]