Phosphorescent Injection Molding Recommendations
- Avoid exposing
product to strong acids and or heavy metal compounds as they will react
with the glow component and destroy the phosphorescent effect.·
greater than 00.05 – 0.10%. Minimum Drying
time should be 2- 4 hours at 180℉(Fahrenheit) in either a dehumidifier or hopper dryer. It
is recommended that a dew point of -20℉(Fahrenheit) be
achieved for the inlet air Phosphorescent master batches or compound material containing luminescent pigment must
be fully dried before using!
- Use the smallest injection molding
machine or barrel size in order to minimize residence time. A maximum
2.5:1 compression ratio screw is also recommended
- The
use of a free-flow screw tip is highly recommended in order to minimize
any shearing effects on the product which might degrade the phosphorescent
effect
- The use of large-size nozzles and gates as well as
full, round runners with no sharp turns are also recommended in order to
minimize shearing·
For processing phosphorescent compounds, it is best to use machinery such as plunger-type injection molding
machines or single-screw extenders, which ensure delicate handling of the
phosphorescent material. Always consult extruding machine
manufacturers' specifications for processing
temperatures and injection speed questions and or problems.
- Utilize the least possible amount of back pressure in
order to preserve the phosphorescent effect
- Mold surface and barrel temperatures should be set at
the lower end of the optimal rang recommended for the base resin
- Be aware that the crystals that produce the
phosphorescence in the product are highly abrasive and may scour the screw
and or barrel. Prior to use thoroughly clean and purge the barrel always
run virgin resin prior to running
- Note that this scouring action may in fact cause the
crystals to become crushed resulting in a duller brownish green color.
Only the adherence to recommended processing parameters and very thorough
clean-out procedures will ensure that the resultant part color matches the
original phosphorescent compound
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