Coatings World - MAY 2017

separated and solid powder
agglomerates destroyed.*
· The powder is completely wetted
with maximum turbulence at the
first contact with the liquid

· The mixing head actually enlarges the surface of the liquid to far exceed the surface of the powder to be wetted – mandatory for complete wetting.

· The centrifugal effect separates
the air from the dispersion

· Dispersion takes place during wetting and not after it – as a result of this, the separated air does not remain in the dispersion and can easily escape

· To avoid any potential build-up of
agglomerates, the powder and liquid
are guided directly into the wetting
and dispersing zone on completely
different paths inside the Conti-TDS
totally avoiding the baked
agglomerates and crusts on the wall
of the vessel, cover and mixing shaft
that very often crumble away,
fall into the mixture and thus reduce
the qualityof the final product.

· Experience has shown that the costs
for manufacturing paints and
lacquers can be reduced by more
than 90 %. Resins are dissolved in
about one fiftieth of the time.

The Conti-TDS is available in several
sizes with powder induction rates
from 1 to 1,100 lbs./min. The machine
is connected to one or more processing
vessels by a piping system and
automatically pumps the product in a
*Thiseffectonlyoccursinaflowingpowderthat is inducted under vacuum. For bulk powder in a vacuum processing vessel or in a metering valve, where powder is transferred into
a chamber under vacuum, the conditions are identical but the volume of the bulk powder does not change. Airis withdrawn but the distance betweenthe particlesremains thesame.

PTI is the North American distributor of Ystral machinery. In addition, they can assist with feasibility and engineering studies, process and plant design, installation, start-up, training, and maintenance and parts inventory. They have a fully equipped and staffed test facility, as well as rental equipment for on-site evaluation.

www.powdertechusa.com | 609-914-0521

loop. The special ATEX version, which can be supplied for hazardous areas, permits even dusty, potentially explosive powders to be handled safely and legally in designated areas..

Removing agglomerates in the powder itself

Powders very often contain dryagglomerates so solid they do not
break up when the air expands inside them. However, even these
agglomerates are no problem for the Conti-TDS. In its wetting zone,
the vacuum is at its peak, expanding the trapped airto itsmaximum volume.
At the same time, the agglomerate is completely wetted from the outside.

After passing through the wetting and dispersing zone, the product is transferred back to the vessel under pressure. This pressure contracts the air inside the agglomerate similar to an implosion and sucks in liquid while simultaneously the dispersing effect breaks up the agglomerates and completely wets the particles. Inthe outerareaofthe rotor, the dispersion is subjected to strong centrifugal forces. Due to the lower density created, the air separates from the dispersion and coagulates to form large air bubbles that can easily escape from the inside of the process vessel.