As the 3D printing / Additive Manufacturing industries
continue to expand, the size requirements for the powder being used continues
to get more precise. The Selective Laser Sintering (SLS) process sinters
powdered plastic together to build structures from the bottom up in layers.
There are various powders used in this process, but the most common are Polyamide
11/12 powders (PA11/PA12), Nylon 11/12 powders, and Thermoplastic
Polyurethane Powders (TPUs). There are various producers of these powders,
but the typical size range required by the industry is 200 microns – 50
microns.
Sieving powders for the SLS printing process is a developing
process that is being done at in two separate stages. The first stage is
the powder preparation stage, whereby producers of these plastic/polymer
powders, manufacture and then sieve the powders into the 200um over 50um
size range. The second stage where the powder is sieved is during the recycle
where any powder that is not sintered can be reused again after being screened.
This is typically coarser screening done at around 200 microns to remove any
powders that may have “splatter” from the laser.
Elcan Industries can help companies drastically limit
downtime, by eliminating the need for any re screening to be done. The Elcan
Industries’ Hi-Sifter is the only screening machine capable of efficient fine
separations down to 10 microns. Unlike traditional screeners that keep the
powders sitting on the screen, the Hi-Sifter has a vertical energy that keep
particles elevated on the screening surface. The result of this approach to
screening is higher rates and efficiencies without the potential for blinding!
Elcan has successfully separated these plastics and polymers at Very small sizes.
Unlike ultrasonic sieves, the Hi-Sifter never allows the particle the
opportunity to blind the hole by keeping them elevated inside the
screener.
For many companies producing powders for the SLS printing
process, the construction of the equipment they are using is imperative.
The Hi-Sifter is constructed of solely polished stainless
steel. There are no screen cleaning devices so there is no outside chance of
contamination of product due to material degradation. The working screen inside
of the system is tensionless, which means that is a screen tear were to occur,
the operator can change the screen right on the plant floor. This means no more
shipping of screens back and forth, and no more expensive charges for replacing
ultrasonic screens. The machine is user friendly and can easily be cleaned and used for multiple products.
Elcan Industries offers any new customers a FREE day of
testing to demonstrate their advanced capabilities. Call today to find out more
(914-381-7500) or check out our website www.elcanindustries.com Tuckahoe, New York.