Vacuum Infusion is a promising technology for the production of large,
high-quality, composite parts. Vacuum Infusion (also known as Resin Infusion,
VIP and also regarded one of the specific processes refered to by the more general
term 'Liquid Injection Moulding') adds improved worker conditions, emissions reduced
to almost nothing and considerable savings on labor costs. In spite of all these
advantages, general acceptance has been slow, mainly due to the high risks involved
with trial-and-error methods due to just guesswork. Without a control method, all materials
and labor are wasted if the chosen injection strategy does not work.
Do your trial infusions on the PC!
A better method exists right now and we have called it 'Controlled Vacuum
Infusion' (CVI). The costly trial-and-error phase has been replaced by FEM
based simulations on the PC. Trial injections and overall optimization of
the process can now be done in a very quick and cost effective way:
- Optimise part injection: location of runners, injection and venting ports.
Eliminate dry spots, calculate and reduce injection time.
- Assess the impact of variations in resin and fabric properties, the effect
of easy flow paths and establish your process window.
- Gather much more feeling for the product by simulation of a large number
of different cases in combination with only a few experiments.
- Use the simulation in combination with a simple strip injection experiment
to measure permeability of the reinforcement lay-up in your product.
You can acquire a license for the RTM-Worx software, but we can also do
the calculations for you, including transfer of the necessary knowledge to
implement the Controlled Vacuum Infusion Technology for your products. Our
technology has proven itself in several projects: in each case our customer's
first infusion of large parts like boat hulls and decks - up to 24 meter - has
resulted in production quality.
The flow simulation software makes it possible to eliminate the guesswork.
Injection strategies that do not work are quickly eliminated and new ways to
infuse parts can be tried out without any risks. It is not necessary to do
costly trials in the mould and no labour or materials are wasted
with the capability to test it on the PC first.
RTM-Worx is a very easy to use simulation code based on the Finite Element
and Control Volume methods to solve the physical equations that govern flow of
a resin through a porous medium.
You can import 3D models from STL, DXF and PATRAN files or enter the model
directly using the integrated geometry editor. Special elements are available
for the Vacuum Infusion process: add runners, easy flow paths with a few mouse
clicks. For gravity, just indicate the direction. Make sure that the infusion
will be fast enough and that dry spots in the laminate are avoided.
RTM-Worx has already been applied for various products made with Vacuum
Infusion. Some examples: yacht hulls and decks (up to 24 meter) (power-)boat
cabins, windmill rotor blades and more. RTM-Worx has also been succesfully
used for Resin Transfer Moulding of aircraft spoiler and stiffeners,
hovercraft rotor blades, composite bus seats and a dormer window roof.
To use RTM-Worx you will need a Pentium II 450 MHz PC with 128 MB RAM,
running Windows XP, 2000 or NT4, a graphics card with 8 MB RAM, capable of
displaying 1024x768 16-bit colour and a 17" monitor. A 3D accelerated
graphics card (with 32 MB RAM) and a 16-bit soundcard are highly recommended.
Necessary skills and learning time
Anyone who has experience with a graphical environment like Windows will
be able to use RTM-Worx within one day: build a model, run the calculation,
view and interpret the results. Some knowledge of the Finite Element Method
and experience with CAD and/or FEM applications is useful but not required.
You will benefit the most from knowledge of and hands-on experience with
We are a company dedicated to the development and support of software
tools for the plastics processing industry. With more than 12 years of
experience in the application of numerical modelling technology in Resin
Injection, reactive transfer moulding, thermoplastic injection moulding,
extrusion, die design and diffusion we build the tools that allow you to
get ahead of the competition. We participate in international projects to
develop and validate new applications.
If you are interested in Controlled Vacuum Infusion Technology: we also
do consultancy and can develop an infusion strategy for your product (using
our RTM-Worx software of course) and advise you on materials and equipment -
everything that is necessary to make sure that it works, starting at the
first infusion you do!
>> Contact us and/or order the Demo CD-ROM
>> Example applications (RTM and CVI)
>> RTM-Worx documentation
>> Read about Virtual Boatbuilding
Click on the individual images on the right for more information about
the specific projects (or use the links in the menu at the left).