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RadTech
UV/EB Technology Conference & Expo 2008
May 4-7, 2008
Lakeside Center at McCormick Place
Chicago, Illinois - United States of America
ANALYTICAL MEASUREMENT
Advanced Methods of Radiachromic
Radiometry for UV Curing
R. W. Stowe, Fusion UV Systems, Inc.
Abstract:
An advanced study of the use of instrument-resolved radiachromic radiometry
to solve some of the difficulties presented by traditional radiometry
in 3-D processing, roll-to-roll printing and coating, and ink jet
printing. Spectral responsivity, dynamic range, linearity, application
to complex surfaces and principles of correlation are discussed. The
principal purpose is to explore the use of standard instruments to
quantify the response of radiachromic films in terms of transmission
or reflection color densitometry. Commercially available films and
several experimental films are studied. The most important conclusion
is that, when carefully designed, applied, and resolved, radiachromic
films can be a useful extension of - but not a substitute for - instrument
radiometry.
Aging
Effects on Physical Properties of Thiol-Ene Photocured Coatings
Junghwan Shin, University of Southern
Mississippi
Abstract: The relationships between aging and glass transition
behavior of Thiol-Ene photocured coatings are studied in view of
physical/mechanical properties such as scratch, adhesion, hardness,
and impact strength. Both are highly temperature and time dependent,
which is caused by the homogeneously dense network structure of
Thiol-Ene. Understanding the characteristic Thiol-Ene structure,
we can evaluate the effect of aging on physical properties and,
moreover, design Thiol-Ene coatings having less aging dependency.
Effect
of Liquid Crystal Structure on Photopolymerization and
Phase Separation Behavior in PDLC
Sucheol Park, Q-Sys Co. Ltd.
Abstract: Polymer dispersed liquid crystal (PDLC) is a polymer-liquid
crystal composite. PDLC is mainly fabricated by photopolymerization-induced
phase separation from homogeneous mixture of liquid crystal and
prepolymer. In this study, we will investigate the structural effect
of lquid crystal components on photopolymerization and phase separation
behavior. And we will present an experimental method to monitor
the photopolymerization and phase separation process simultaneously
by means of resistivity and turbidity measurement.
Modeling
Dynamic Exposure for Analysis
Jeff Thommes, Precisioncure, LLC
Abstract: Irradiance for Dynamic exposure2 conditions produce
irradiance profiles that can pose unique challenges for manufacturers
dealing with free radical cured coatings. Variance in these irradiance
profiles from the edges to the center of the lamp/reflector focus
as well as the initiator package selected can affect the final coating
ranging from insufficient surface or adhesive cure to obtaining
inconsistent or unacceptable physical properties even from well
developed formulations or exposure systems. The purpose of this
paper is to outline use of modeling to develop and test solutions
to better understand these effects and build more robust formulations
and systems to achieve final product acceptance.
UV-dose
indicator formulations: A convenient and quantitative way to optimize
the UV curing process
Eugene V. Sitzmann, Ciba Specialty Chemicals
Abstract: A convenient and quantitative method that is useful
for determining effective UV exposure is described, which is based
on new UV-dose indicator formulations. The UV dose indicators develop
color as a function of the UV-dose while simultaneously being cured.
The method allows one to characterize the UV curing process over
the whole surface of the coated article. It is particularly useful
for three-dimensional coated objects. Color development with this
system was found to be correlated to the applied UV light exposure
as well as to the cure efficiency. The method offers to the end-user
a way to forecast the coating properties, to optimize a radiation-cure
process and to monitor the alteration of the energy source over
time.
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