SCREENCHANGER

While PATT Filtration prides itself on its range of screenchangers
handling the broadest range of polymers, filtration problems often
demand something more than our standard product line. Our custom
engineering services offer far more than the "Off the Shelf"
screenchanger. Our flexibility as a small company enables quick
response to customer problems and service requirements.

Our screenchangers use custom-fit wire mesh screen packs. Made from
a variety of square mesh and dutch weaves, they can be customized to fit
your needs, whether you run LLDPE, PVC, ABS, HDPE, PP, rubber or a
special blend proper to your production. The pack combinations can
come in stainless or plain steel and are designed for all of our PATT
Filtration screenchanger sizes. Mesh sizes from 20 to 400 guarantee
various level of filtration precision. Packs are custom tailored mesh
combinations specific to your production needs. Clockwise from the
right: E-size, D-size, C-size, B-size and A-size screens, various meshes.

PATT Filtration custom tailors continuous screenchanger equipment to
filter any engineering polymer with pressures up to 12,000 psi and
temperatures up to 650F.
Our experts in the fields of backflush and plastic, polymer filtration, metallurgy and engineering have made our ROTARY IIITM Constant Pressure Drop Continuous filtration system the preferred choice among industry leaders and have made PATT Filtration a worldwide leader for customer service and satisfaction.

Each of the devices mentioned above are capable of filtering polymers
and each performs its job by particulate retention. Because this
discussion is limited to only the most practical solutions, only the
most popular, the screen filtering technique used in the backflush and plastic industry will be discussed.

PATT Filtration is a leader in rotary polymer filtration equipment. As
such, we have an excellent knowledge of our clients’ processes.

We here at PATT Filtration have made it our goal to deliver a superior
quality product to meet all your rotary polymer filtration
needs.Through the years, our ongoing efforts toward perfection have
brought about many changes, some subtle other still more drastic, to
both our product line as well as our corporation.

From our proprietary thin film coating to our dedication to achieve ISO
9001 Standards by September 2004 PATT Filtration places emphasis on
ensuring customer satisfaction and product quality. Our experts in the
fields of plastics, rotary polymer filtration, metallurgy and
engineering have made our ROTARY IIITM Constant Pressure Drop
Continuous filtration system the preferred choice among industry
leaders and have made PATT Filtration a worldwide leader for customer
satisfaction.
From the outset, the company’s main objective to provide superior
quality products has been realized by applying advanced manufacturing
technology. A large part of the earnings is reinvested in R&D and
latest technology machinery. We pioneered new materials and coating
technologies to achieve a rotary filtration system that simply is
unmatched. Integrated microprocessor controls provide reliable
operation, simplified maintenance, and computer interface.

The more thought and technology that goes into the selection,
composition and construction of a screen pack, the better and
more efficient the rotary filtration process.

Regardless of the method chosen to replace or renew the screen pack,
it, the screen pack, is the very heart of the polymer rotary filtration
process. When the screen pack is properly designed and installed, it
will probably do an excellent job of removing particulate.
If your process requires the PATT Filtration's ROTARY III disks to come
with removable TM breaker plates, a special backflush remover tool is
available for a mechanized, safe and effective breaker plate removing
from your unit's disk.

The optional hydraulic breaker plate backflush remover tool makes the
removal of breaker plates easier and safer for the operator and
prevents damage to the disk and breaker plates which could occur if
tools like steel hammers are used to remove the breaker plates.
Whatever you need - continuous filtration systems for fibers, film and
sheet, profile and tubing, or systems to withstand the rigors of
unknown materials and contamination in recycling - our Application
Specialists will work directly with you to devise the best solution.

Our engineers will adapt selected continuous filtration systems to
the extruder and die in the most suitable way. The capability to
manufacture all parts in-house insures quality and on-time delivery.
While PATT Filtration prides itself on its range of screenchangers
handling the broadest range of polymers, filtration problems often
demand something more than our standard product line. Our custom
engineering services offer far more than the "Off the Shelf"
screenchanger. Our flexibility as a small company enables quick
response to customer problems and service requirements.

Our screenchangers use custom-fit wire mesh screen packs. Made from
a variety of square mesh and dutch weaves, they can be customized to fit
your needs, whether you run LLDPE, PVC, ABS, HDPE, PP, rubber or a
special blend proper to your production. The pack combinations can
come in stainless or plain steel and are designed for all of our PATT
Filtration screenchanger sizes. Mesh sizes from 20 to 400 guarantee
various level of filtration precision. Packs are custom tailored mesh
combinations specific to your production needs. Clockwise from the
right: E-size, D-size, C-size, B-size and A-size screens, various meshes.

PATT Filtration custom tailors continuous screenchanger equipment to
filter any engineering polymer with pressures up to 12,000 psi and
temperatures up to 650F.
Continuous Filtration is not necessarily constant flow or constant
pressure filtration.

Of course, if planned shutdowns exist for other reasons such as color
changes or housekeeping, and filtration media renewal is done during
this time, then the production predictability goal becomes academic.
For those processors who need to maintain predictable production,
several solutions are offered. Each solution involves the concept of Continuous Filtration. In the industry, Continuous Filtration is achieved by changing screens without slowing or stopping the extrusion line to effect the change.

One solution used to provide continuous filtration is a modified slide
plate screen changer. The slide plates are hydraulically driven and are
set up in a one way track. Three slide plates, or blocks, are in the
track as the screen change begins: one active block, one heated standby
block and one recently cleaned block.

A ribbon type screenchanger also requires a specific screen
which costs double or even triple that of the rotary backflush screens. The
savings on screen costs with a rotary backflush system are substantial
especially when using a high percentage of regrind or recycled
material.

Leakage is a problem with most screenchangers. In use they are usually
torqued up to prevent leaks and then backed off when a screen change is
needed. Rotary backflush screenchangers have a huge sealing surface and leakage
is not a common problem. The body blocks and the faces of the disc are
superbly machined and polished to mirror like finishes. Using very
precise torquing techniques, manufacturers squeeze the disc to
unbelievable values.

PATT Filtration was established in 1986 in St-Eustache, Canada. Since
then, we have grown to be a major competitor in the filtration systems
industry. PATT Filtration is now a division PATT Technologies.

PATT Filtration is one of the industry’s leading suppliers of constant
pressure, continuous screenchangers. The company’s Rotary III is the
only continuous screenchanger manufactured in North America and backed
by a performance guarantee. Patt Filtration guarantees no downtime
during screen changes. Its custom tailored solutions enable clients to
filter any engineering polymer with pressures up to 12000 psi and
temperatures up to 650°F.

The vent and vacuum port will automatically purge air from the
oncoming screen cavity to avoid air being passed into the melt flow.
The pressure relief port will automatically purge material from the
exiting screen cavity to ensure operator safety. The filter disc is
enclosed between two body blocks and advanced in ultra-fine angular
steps by the microprocessor control, allowing continuous rotary even
at lowest speed, while maintaining a constant pressure drop.