Design and Manufacture of Plastic Components for Multifunctionality : Structural Composites, Injection Molding, and 3D Printing

223 Pages·2016·11.82 MB·English

Design and Manufacture of Plastic
Components for Multifunctionality
PLASTICS DESIGN LIBRARY (PDL)
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Design and Manufacture of Plastic
Components for Multifunctionality
Structural Composites,
Injection Molding, and 3D Printing
Vannessa Goodship
Bethany Middleton
Ruth Cherrington
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In memory of my fantastic dad.
He taught me that there is no such thing as too much caffeine
or too much cake.
The authors would also like to dedicate the book to the follow-
ing people: Rebecca Williams, Tony Middleton, Adam Longfield,
and Deb Bate.
GO PAWS TEAM!
List of Contributors
All contributors are located at: Warwick Manufacturing Group,
University of Warwick, Coventry, UK
Ruth Cherrington
Vannessa Goodship
Jianwang Liang
Bethany Middleton
Benjamin M. Wood
xiii
Preface
While plastic manufacturing continues to be driven by the market pull,
new developments in materials and processes have opened up new design
possibilities for manufacturers to add value and function to their products.
Mass customization and linked systems of material suppliers, manufac-
turer, and end user also allow more control within both production and
supply chains than ever before.
Multifunctionality not only provides an enabler for manufacturers to
create exciting and distinct products in the marketplace but also allows
greater control of in-house manufacture. One component can replace what
may have been a number of different components that were procured and
assembled separately.
Multifunctionality can be brought about in three distinct ways: by em-
bedding in material, by adding extra layers and function (addition), or by
integrating multifunction into the entire structure.
The book explores each of these concepts throughout the book, at a
level that should be accessible to manufacturing engineers, designers, and
students interested in the manufacturing area.
Chapter 1 introduces what is meant by multifunction and presents
examples along with introduction to some potential plastic process routes
not dealt with elsewhere. Chapter 2 looks at the principles in “embed,” by
introducing some multifunction materials. It also begins exploration of the
concept of “addition” by looking at deposition methods for adding materi-
als to substrates such as inkjet printing. Chapter 3 moves these concepts
into bulk manufacturing with a first look at composite materials and manu-
facturing methods. Chapter 4 focuses on the mass manufacturing method
of injection molding and how multifunctionality has slowly developed as
technology has advanced. Chapter 5 then looks at the design possibilities
in the highly publicized additive manufacturing process. These two pro-
cesses are chosen to provide two very distinct approaches to manufacture.
One process is designed for mass manufacture and one for highly cus-
tomisable deigns, at the interface across manufacturing is a platform for
highly multifunctional design. Finally, Chapter 6 briefly ties some of these
concepts together and closes the book.
I hope you enjoy exploring the possibilities.
Dr Vannessa Goodship
xv
Acknowledgments
Many thanks to Colin Tirel and his colleagues at ARBURG, Germany,
for providing the pictures in Chapter 4.
xvii
1 Introduction to Multifunctionality
and Manufacture
Ruth Cherrington and Vannessa Goodship
1.1 Introduction to Multifunctionality and
Manufacture
Multifunctional materials are designed to improve overall system
performance. The term “multifunctional” is commonly used to describe
something that has or fulfils several functions. Multifunctional materials
can be classified and grouped into a wide range of categories and the range
significantly depends on materials and applications.
There are several ways in which the word “multifunctionality” can be in-
terpreted, these have been categorized into three main areas (Matic, 2003).
1. Embedding of functions within a component – these ma-
terials comprise two distinct phases where one function is
embedded in another. Multifunctional composites often fall
into this category as a variety of components are embedded
within a common part.
2. Addition of functions into the system – the introduction of
a material to provide additional performance. This can be
introduced by a simple coating or lamination process; an
example of this is surface-mounted health monitoring.
3. Integration of functions shared in a volume of material –
these types of materials are fully integrated. There is little
or no physical distinction between them and the phases are
intermeshed. These types of systems are often developed
to reduce volume or mass. An example is an embedded an-
tenna or battery that shares the mechanical load.
Nanomaterials, biomaterials, and “smart” materials (those which
change to and external stimuli such as temperature, pressure, or light) are
being incorporated within traditional structural materials to produce per-
formance-tailored products. These include ceramics, polymers, and metals
(which will be discussed in more detail in Chapter 2). These speciality
materials are being tailor-made to provide specific functions, which are
finding homes in a wide range of applications.
Design and Manufacture of Plastic Components for Multifunctionality
http://dx.doi.org/10.1016/B978-0-323-34061-8.00001-6 1
Copyright © 2016 Elsevier Inc. All rights reserved.
2 Design and Manufacture for Multifunctionality
Although as we have discussed there are several ways in which “mul-
tifunctionality” can be interpreted and therefore integrated into materials,
one of the simplest methods is by simply embedding of functions within
a component (Matic, 2003). Nanomaterials possess unique, beneficial
chemical, physical, and mechanical properties that have been successfully
incorporated within components for a wide range of applications. One par-
ticular area that is likely to continue to expand is the use of nanomaterials
as functional fillers in a polymer matrix. Nanoscale materials differ sig-
nificantly to that of their corresponding bulk counter parts offering several
advantages including increased surface area, decreased sintering tempera-
tures, improved photocatalytic activity, and antimicrobial properties.
There are several examples of how nanomaterials have been success-
fully incorporated into products:
• Plastic beer bottles that contain carbon nanotubes (CNTs) to
stay cold for longer periods of time (Arivalagan et al., 2011)
• Tennis racquets reinforced with carbon nanotubes to im-
prove the mechanical properties of the composite (Hayashi
et al., 2007)
• Nanoclays platelets are incorporated into food packaging
films to provide a barrier against oxygen and water; there-
fore, extending the shelf life (Goldberg et al., 2011)
• Silver nanoparticles are embedded within plastics to kill bac-
teria in refrigerator liners (Kampmann et al., 2008)
There are a number of ways nanomaterials are incorporated into a com-
posite, but on a bulk scale this is done by the use of the plastic extrusion
processes (which is discussed further on). One of the main problems asso-
ciated with the use of nanomaterials in composites is the creation of a uni-
form dispersion of particles within the polymer matrix. Nanoparticles have
a tendency to cluster together, due to large surface forces on the surface
of the particles. These are known as either aggregates or agglomerates,
depending on the nature and strength of the bonds between the particles.
These aggregates or agglomerates are an undesirable formation and a uni-
form dispersion is needed to produce consistent and reliable properties
within the composite. Research has found that the addition of only 0.5
wt% CNTs in a polypropylene matrix results in the formation of large ag-
gregates (Tjong et al., 2007); therefore, modifications to conventional pro-
cesses will need to be realized to fully utilize materials such as these. CNTs
are not unique in this respect, with innovative new materials come several
challenges associated with the manufacturing, processing, and incorpora-
tion of the materials into usable products. Therefore, this book will look at