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This book is intended to fill a gap between the theoretical studies
and the practical experience of the processor in the extrusion of
thermoplastic polymers. The former have provided a basis for
numerical design of extruders and their components, but generally
give scant attention to the practical performance, especially to
the conflict between production rate and product quality. In
practice extruders are frequently purchased to perform a range of
duties; even so, the operator may have to use a machine designed
for another purpose and not necessarily suitable for the polymer,
process or product in hand. The operator's experience enables him
to make good product in unpromising circumstances, but a large
number of variables and interactions often give apparently
contradictory results. The hope is that this book will provide a
logical background, based on both theory and experience, which will
help the industrial processor to obtain the best performance from
his equipment, to recognize its limitations, and to face new
problems with confidence. Mathematics is used only to the extent
that it clarifies effects which cannot easily be expressed in
words; ifit is passed over, at least a qualitative understanding
should remain. The approximate theory will not satisfy the purist,
but this seems to the authors less important than a clear
representation of the physical mechanisms on which so much of the
polymer processing industry depends. M. J. STEVENS J. A.
Experts in rheology and polymer processing present up-to-date,
fundamental and applied information on the rheological properties
of polymers, in particular those relevant to processing,
contributing to the physical understanding and the mathematical
modelling of polymer processing sequences. Basic concepts of
non-Newtonian fluid mechanics, micro-rheological modelling and
constitutive modelling are reviewed, and rheological measurements
are described. Topics with practical relevance are debated, such as
linear viscoelasticity, converging and diverging flows, and the
rheology of multiphase systems. Approximation methods are discussed
for the computer modelling of polymer melt flow. Subsequently,
polymer processing technologies are studied from both simulation
and engineering perspectives. Mixing, crystallization and reactive
processing aspects are also included. Audience: An integrated and
complete view of polymer processing and rheology, important to
institutions and individuals engaged in the characterisation,
testing, compounding, modification and processing of polymeric
materials. Can also support academic polymer processing engineering
programs.
Experts in rheology and polymer processing present up-to-date,
fundamental and applied information on the rheological properties
of polymers, in particular those relevant to processing,
contributing to the physical understanding and the mathematical
modelling of polymer processing sequences. Basic concepts of
non-Newtonian fluid mechanics, micro-rheological modelling and
constitutive modelling are reviewed, and rheological measurements
are described. Topics with practical relevance are debated, such as
linear viscoelasticity, converging and diverging flows, and the
rheology of multiphase systems. Approximation methods are discussed
for the computer modelling of polymer melt flow. Subsequently,
polymer processing technologies are studied from both simulation
and engineering perspectives. Mixing, crystallization and reactive
processing aspects are also included. Audience: An integrated and
complete view of polymer processing and rheology, important to
institutions and individuals engaged in the characterisation,
testing, compounding, modification and processing of polymeric
materials. Can also support academic polymer processing engineering
programs.
This book is intended to fill a gap between the theoretical studies
and the practical experience of the processor in the extrusion of
thermoplastic polymers. The former have provided a basis for
numerical design of extruders and their components, but generally
give scant attention to the practical performance, especially to
the conflict between production rate and product quality. In
practice extruders are frequently purchased to perform a range of
duties; even so, the operator may have to use a machine designed
for another purpose and not necessarily suitable for the polymer,
process or product in hand. The operator's experience enables him
to make good product in unpromising circumstances, but a large
number of variables and interactions often give apparently
contradictory results. The hope is that this book will provide a
logical background, based on both theory and experience, which will
help the industrial processor to obtain the best performance from
his equipment, to recognize its limitations, and to face new
problems with confidence. Mathematics is used only to the extent
that it clarifies effects which cannot easily be expressed in
words; ifit is passed over, at least a qualitative understanding
should remain. The approximate theory will not satisfy the purist,
but this seems to the authors less important than a clear
representation of the physical mechanisms on which so much of the
polymer processing industry depends. M. J. STEVENS J. A.
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