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Saint-Gobain Performance Plastics
developed its belting materials for applications that require
superior release characteristics, permeability for rapid drying,
dimensional and thermal stability, and the dynamic strength to
stand up to the most rigorous operating conditions. The unique
behavior of the materials results in a product that is more
practical and cost-effective than conventional belting
materials.
Release Properties
The release characteristics of
PTFE are superior to those of any other high temperature
material. This non-stick property is retained over a full range
of operating temperatures.
Permeability
Our belting combines a maximum
amount of open area with good mechanical strength. The result is
a very high level of controlled air flow through the belt,
maximizing the rate of drying.
Dimensional Stability
The woven reinforcement results
in an elongation of approximately 1% under normal mechanical
loading, even at temperatures of 550°F. Length distortion is
exceptionally low, while width rigidity and stability are
enhanced by the high-modulus of the reinforcement.
Thermal Stability
Chemfab® brand belting may be
used continuously at temperatures up to 550°F without reducing
its performance.
Dynamic Strength
Our belting has been subjected to
static and dynamic tests which indicate that it can withstand
all normal operating conditions affecting service life.
Chemical Resistance
PTFE surfaces are unaffected by
most chemicals and solvents.
Fabrication Techniques
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SEAM DESCRIPTIONS
Saint-Gobain Performance Plastics,
in cooperation with Andrew Roberts, provides a broad
range of seam options suited to the performance
specifications of each belting system.
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FOLD BACK LOOP SEAM
The carcass of our open
weave belting material is folded back
onto itself at each end and stitched into place. From
the apex of each fold, one or more fill (cross-wise)
threads are removed to create a series of loops. The
looped ends are then meshed together and a joining pin
is led through to complete the seam. This method is a
direct and reliable means of creating a seam from the
same material as the belt itself.
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HINGE SEAM
Separate sections of
material are folded over each of the belt ends, then
heat
sealed and/or stitched in place. A series of castellated
or crenel notches cut into the apex of each fold form a
pattern of
square or “toothed” loops at the belt ends. The ends are
then meshed and joined by a pin fed through the matched
pattern of loops. This seam is produced with TCK
(KEVLAR, a superior strength fabric, coated with PTFE).
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TCK 90 SEAM
Using our weaving
technology,
the TCK 90 seam incorporates
braided KEVLAR yarns woven into an open weave. This
extremely strong seam is then stitched to the belt
carcass, resulting in an open weave seam that does not
block airflow. This seam is ideal for drying
applications. |
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CABLE SEAM
High-temperature webbed synthetic
fabric assures high
strength performance of the cable seam. Alternately
woven one side open and one side closed every
1/8",
sections of synthetic material are folded over the belt
ends and stitched in place, creating a series of loops
parallel to the width of the belt. These belt ends are
then meshed and joined by a wire fed through to complete
the seam. This seam is produced with high strength,
high-temperature synthetic fibers.
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PIN SEAM
This seam
incorporates reweaving to provide the convenience of a
mechanical joining technique combined with the benefits
of an endless belt. Fill (cross-wise) threads are
removed at each belt end to free warp (lengthwise)
threads. The warp threads are then folded back and
rewoven into the belt carcass to form loops. The two
ends are then meshed together and joined by a pin passed
through the loops. Joining pins are available in
stainless steel or non-metallic materials. |
FLAP OVER SEAM
A PTFE-coated, synthetic
fabric
flap over the seam area can be
heat sealed and/or stitched to a belt. This will ensure
a continuous release surface which will inhibit mark-off
from seam contamination and protect the seams from
abrasion. A flap over seam is generally used with a
metal seam and is available with all Saint-Gobain
Performance Plastics belting styles. |
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ALLIGATOR OR CLIPPER LACED SEAM
In this extremely strong and
flexible mechanical seam,
Alligator or Clipper type metal lacing is locked into
reinforced belt ends. The laced ends are then meshed and
joined by a pin. Available in stainless steel, steel or
Monel. |
ENDLESS WOVEN SEAM
Fill (crosswise) threads
are removed at each belt end to free warp (lengthwise)
threads. The belt ends are then joined by reweaving the
warp threads into the belt carcass of the opposite belt
end. This technique produces a truly endless belt with
excellent tracking characteristics, uniformity and
greater overall flexibility than belts with conventional
seams. |
EDGE
REINFORCEMENT
Belt edge reinforcement
provides additional support for pin guides, grommets and
eyelets, protects belt edges from wear and unraveling
and presents a uniform edge for automatic tracking
sensors. We offer the following edge reinforcements with
all belting styles and recommend them for use with
porous or screen dryers materials such as TCK 1590, TCN
1590, TCK 1589, CHEMFAB 1590 and CHEMFAB 1589.
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FINGER
SPLICE
This unique splice uses “fingers”
from the belt carcass that are
locked together through heat sealing. A
finger splice used on a solid belt produces a very
smooth, continuous release surface.
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3 Mil PTFE Film:
Heat sealed to the belt
edge, this reinforcement is available in widths from 1"
to 1-1/2".
5 Mil/10 Mil Fabric:
Reinforcing strips of 5
or 10 mil woven glass fabric coated with PTFE are heat
sealed and/or stitched to the belt edge. Available in
widths from
1/2" to 2". |
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