Mold-Masters Fusion G2, User Manual

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5.2 Gate Seal Finishing
Most nozzles are supplied with the gate seal installed (except when the seal
requires final machining by a toolmaker, such as the Hot Valve / Hot Sprue).
NOTE
The gate seals supplied with your system may need to be adjusted to
tolerances based on the material grade and cooling in the cavity. Refer to
your Mold-Masters General Assembly Gate Detail drawing to determine if
gate seal finishing is required. Refer to the General Assembly drawing to
determine which gating method applies.
5.2.1 Hot Valve / Hot Sprue / F Type
CAUTION
Protect the thermocouple so it is not damaged during machining.
CAUTION
NOTE
Heat expansion of the nozzle must also be taken into consideration.
Contour of gate seal should be done at process temperature.
Always refer to the General Assembly drawing to confirm the contact length.
Hot valve and hot sprue gated systems are supplied with gate seals that are
oversize in length. They must be machined prior to installing the nozzle into
the nozzle well bore. Check the chart on the General Assembly drawings for
the length and contact height required.
See Contact Length “H” on table below.
Table 5-1 Typical Contact Length
Polymer Structure Contact Length “H” in mm (in.)
Amorphous Filled or Reinforced 4.00 (0.16)
Semi-crystalline Filled or Reinforced 3.00 (0.12)
Crystalline Filled or Reinforced 2.00 (0.08)
Figure 5-6 Example contact length “H”
5-4
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ASSEMBLY
FSG2 User Manual