NOTE : BIMS-1 and BIMS-2 ARE TRAININGS ON TWO DIFFERENT TOPICS AND
THERE IS NO PREFERRED SEQUENCE. YOU CAN ATTEND ONE OR BOTH IN WHATEVER
ORDER YOU PREFER
UNDERSTANDING INJECTION MOLDING OF THERMOPLASTICS
seminar will focus on complex phenomena behind the Injection Molding
process, with strong emphasis on the understanding of part's problems
(aspect, shrinkage, warpage, weld lines, burns, ...) and their
relationship to material properties (amorphous, semi-cystalline,
filled, unfilled) and the process itself.
The participants we expect could be :
- design engineers in charge of molded parts
- mold making specialists
- flow analysts looking for analysis
- project leaders involved in developing molded
- research engineers interested in injection
- mechanical engineers interested in process
induced weakness and strength
engineers or designers whishing to improve their understanding of a
given class of materials (i.e. glass fiber filled polymers).
- students involved in the field
- young, skilled professionals with little field
- flow analysis developers
- customer support engineers
The BIMS-1 seminar content
- Basic polymer thermal and rheological behaviour.
- Effect of pressure on polymer properties.
- The flow process in Injection Molding.
- Part geometry and flow pattern.
- Compressibility, phase change and PVT data.
- What is crystallinity and how does it affect
- The packing phase: key to the dimensional
quality of the part.
- Effective part, mould and process design for
proper cavity packing.
- Understanding the shrinkage build-up.
- Part warpage mechanisms: designing for minimum
warpage, according to material properties and part shape.
- Warpage: the special case of fibre filled
- The concept of residual stresses: the compromise
- Final conclusions and wrap-up - Seminar
evaluation by the participants.
seminar is not specifically about Injection Molding Simulation.
However, the intention is to clearly help those among the participants
who are "Flow Analysis users" to gain a thorough understanding of the
concepts that form the basis of existing code. Model assumptions and
corresponding limitations will be highlighted and discussed.
seminar will be highly interactive, with limited attendance, allowing
for questions, group discussion and analysis of the attendant problems.
Parts or drawings are welcome for open discussion, when possible.
The first part of the seminar will quickly describe the
process cycle for the purpose of setting up a common vocabulary.
The seminar may not fit the needs of beginners in the field.
UNDERSTANDING MECHANICAL PROPERTIES OF THERMOPLASTICS
Vito LEO, founder and owner of BIMS SEMINARS SPRL based in Belgium, has
presented countless times his very well-known training on Injection
Molding in Denmark. This seminar will still be presented on a yearly
basis in public sessions organized by ATV-SEMAPP or in private form to
Over the years, Vito LEO, has also
developed a large experience in the field of Mechanical Properties of
Polymers and after a long preparation has decided to offer a new
seminar to the Plastics Community.
It appeared indeed that,
similar to the subject of Polymer Processing, many professionals
involved in plastic part design or materials specialists, have a
relatively poor understanding of the very complex thermo-mechanical
performance of polymeric materials or compounds. This is however often
a critical knowledge considering the frequently complex failure
phenomena observed in plastics (creep, impact, environmental stress
cracking, plastic yielding, crazing, brittle failure,…).
subject is both very wide and extremely challenging. The ambition of
this new BIMS seminar (BIMS II) is to provide an in depth introduction
to the participants, regardless of their scientific background or
specific experience in the field.
Two days is too short to get
very deep into the details, but more than adequate to explore quite
deeply the subject, establishing a solid knowledge base for all
participants, and preparing them to consider more specialized reading
or training in their particular field of interest within the area
seminar will focus on the complex mechanical performance of plastics in
order to introduce the key behavior of these unique materials
(visco-elasticity, non linearity, creep, impact, failure mechanisms).
The participants we expect could be :
- design or mechanical
engineers working with plastics
- molders interested in part
- professionals interested in
plastic part failure mechanisms
- FEA specialists
- project leaders involved in
developing plastic parts
- research engineers
interested in polymer performance
specialists or designers wishing to improve their understanding of
mechanical performance of a given class of materials (amorphous,
crystalline, filled or unfilled).
- students involved
in the field of polymers
- young, skilled
professionals with limited experience in the field
professionals looking for a fresh view on (or review of) polymer
- flow analysis
specialists wishing to extend their knowledge to the field of
- customer support
The BIMS II 2-day seminar content
The teaching material (over 200 slides) provides an in depth
introduction in the field of plastic mechanical performance.
attending the seminar, we expect the participants to have a fairly good
answer to many typical questions that often come-up when dealing with
plastics, like, for instance:
- Why does the modulus of plastics change so much
with temperature? Why is this change so different from one polymer to
do amorphous polymers generally fail in a brittle way in long term
tests or impact ? Why do some still perform quite well in these
- Why do we have such a thing as a
“brittle-ductile” transition in polymers ? What is it exactly ? Why are
some polymers ductile at some test rates and brittle at lower as well
as higher strain-rates ? Why is the test “timing” so important for
- Why does plastic performance change so much with
processing conditions, even when unfilled, and even when amorphous ?
- Why do polymers “age” ? What does this mean and
what are the implications on performance ?
are the mechanisms behind rubber reinforcement ? Why is the morphology
of these blends so critical ? Why do we need to tailor the formulations
to every specific polymer ?
- What is Yielding ? What is plastic flow ? Why do
some polymers “shear-band” and neck in a tensile experiment, and some
- What is the role of crystallinity in mechanical
properties of plastics ?
does a polymer, at the same temperature, generally fail at very
different times and stress levels in short vs. long term (creep) tests
? Is there a way to predict long term performance from shorter terms
- How can we measure properly the intrinsic
mechanical properties of polymers at large strains without artifacts
(necking) or premature failure ?
- Why do glass fiber
increase modulus and strength but reduce elongation at break ? What are
the reinforcing mechanisms ? How critical is the interfacial strength
between matrix and filler ? What is the optimum fiber length ?
do we test plastics with and without a “notch” ? What is really
happening at the notch ? Why do some polymers still perform when
notched and some don’t ?
list of questions would be very long, but the ones listed above give at
least a good idea of the general approach of the seminar. No “recipes”,
but mainly focus on “understanding” so that any new question, new
problem, new polymer can hopefully be addressed and examined with the
right concepts in mind.
Many of the subjects
presented are supposedly well-known and largely described in text-books
or scientific literature. However, the reality is often that the
subject appears to be daunting making it very difficult or almost
impossible to find the necessary knowledge, presented in a
comprehensive but understandable way, within a concise text.
seminar may not fit the needs of beginners in the field, although our
intention is to present material requiring no pre-requisite knowledge.
Conversely, specialists in the field may find this 2 day’s training too
general to fit their needs. We believe however that this seminar may
bring a fresh view on classical material which will provide useful
understanding and interpretation tools to all participants.
to the now classical BIMS seminar on Injection Molding, this training
on mechanical properties is somewhat more challenging in terms of
theoretical content. We count on the attendants’ active participation
to bring up examples of plastic part failures or other mechanical
related issues, in order to make the session as interactive as
possible. As observed over the years with our BIMS I seminar on
Injection Molding, we will enrich the presentation with more and more
practical examples provided by the participants as we go. We thank you
in advance for your help and material (parts, drawings, pictures,
examples, good stories…).
The session “zero” of this
seminar has been already presented privately to specialists in the
field at Novo Nordisk (Oct. 2013), and was largely appreciated.
We now have presented BIMS-1 about 15 times.
hope to see you soon at a coming session of this training !
Check the latest news page for the agenda of coming dates or contact us
for a private session in your company or institute.