SPLIT SHEATH INSERTION HEATERS - SST AND QST
 The
SST and QST Split Sheath Insertion Heaters are designed especially
for platen, die or mold heating applications where the holes are poorly
drilled or worn through age. Independent expansion of each section
of the SST and QST when energized, creates intimate contact with the
wall of the hole. SST Insertion Heaters have a single split along
the length. The two sections expand in opposite directions. Conductive
heat transfer is excellent. The QST, or Quad, has additional sections
that expand in four directions. Surface contact is superior to any
available insertion heater. The simple internal design of the SST
and QST generates a uniform linear temperature profile. Perhaps the
most outstanding feature is how easy the SST and QST Split Sheath
Insertion Heaters are removed from the hole for replacement or other
servicing requirements. As the temperature cools, the sections contract,
allowing the SST and QST to slip from the hole without difficulty.
In platens and presses utilizing long, conventional cartridge heaters,
Ogden's split sheath design can reduce down-time and maintenance costs.
Where repair or redrilling of the hole is not practical, the SST and
QST offer outstanding performance. |
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Conductive heat transfer by cartridge heaters in oversized holes is restricted to where surface contact exists. Sheath expansion is limited (A). Expansion of the SST Split Sheath Heaters when energized is significant, improving heat transfer (B). Diameters are nominally .005" undersized for maximum expansion in standard applications with a fit of .005" - .007". Where an inconsistently drilled or worn hole creates larger fit considerations, the SST Split Sheath Heater offers exceptional performance (C). The QST, or Quad's effect is similar to the SST
with the exception that there are four separate sections (D). Conductive
heat transfer is superior to any available insertion heater (E). |
Thermal
gradients exist along the length and around the circumference of
standard sheathed cartridge heaters. These temperature differentials
can cause increased camber, resulting in the heater's seizing or
binding in the holes. Removal is often difficult and damage to the
interior walls of the hole can occur. The uniform temperature profile
of the SST and QST allow the separate sections to evenly expand
and contract. Removal is easy. |
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Fig. XS Flexible Leads Fig. YS Screw Terminals |
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