In today’s
highly competitive world there are companies that are moving into higher
value-added chemicals and materials. Further, environmental regulations are
increasing the stringent rules as governments at the national, state and local
levels are requiring that industries control pollution by limiting emissions.
Thus there is a quest to limit those wastes and emissions. In this competitive
environment, the filter end user, filtration design engineer or filter end user
will require material to increase the performance and durability. This shows
that the polytetrafluoroethylene PTFEtube is well suited to cater to the multitude of these demands and help the
industry to meet the many environmental obligations.
PTFE
OVERVIEW
PTFE was
discovered by Dr. Roy Plunkett at DuPont in 1938. Earlier it was limited to
wartime applications until after World War II when it was first introduced
under with the trademark Teflon. Today, there are a number of suppliers which
offers 60,000 tons/year. Where the large fluorine atoms form a sheath around
the carbon backbone, providing it from attack from organic, acid, or base
solvent, except at elevated temperatures. This sheath also imparts low surface
energy and providing a very low coefficient of friction (< 0.1) and nonstick
properties. This low surface energy renders PTFE hose both hydrophobic and oleophobic, so neither the aqueous
nor oily materials adhere to it. Thus, it is really easy to mechanically remove
any dust or filter cake which gathers on the surface.
PTFE monofilament
or thread is fit for filter manufacture either as:
Talking
about a sewing thread specific for sewing filter bags of PTFE or made for
high-performance fibers that are used in hot gas filtration, such as baghouse
filters found in the stacks of coal-fired boilers, cement plants and so on.
As a woven
scrim for needle punching PTFE or other high-performance fibers to form the
fabrics that are utilized in baghouse or other filter formats.
A filament
for wound-core filters is used for corrosive liquid filtration applications.
All of these
applications tap onto the superior chemical resistance and offers an excellent
heat resistance of PTFE.
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