ALTANA Resource I Mechanical Drive - Manual (Page 5)

4
E. Wire rod position adjustments for various
conditions.
1. The fi ne height adjustment knobs are located
under the carriage. The adjustment screws
are directly related to the micrometer dials.
2. There are two general positions available for
the wire rod when making a draw-down.
Which to use is determined by the
characteristics of the material being applied,
such as its viscosity, slip, and the surface
condition of the test card or substrate. Also
to be evaluated are the resulting fi lm
properties desired by the user.
2a. No. 1 position is where there is no
drawdown pressure on the test card,
and there is no air gap between the wire
rod and the test card. (Le. the wire rod
rides on top of the test card but exerts
no squeezing action.) For this setting
you should know the test card thickness
and the wire rod wire diameter.
Example: Test card thickness = 0.011“
Wire rod wire diameter = 0.003“
Sum = 0.014“
The fi ne adjustment knob should be
set to ensure the wire rod will be
positioned on the test card surface with
no additional downward pressure on the
card. The standard spring pressure is
still in force to prevent the wire rod from
being lifted off the test card by any
resistance exerted by the material being
applied.
2b. No. 2 position provides an air gap
between the wire rod and the test card
surface. This gap can be obtained using
the fi ne adjustment knobs while reading
the dial indicators. Once the settings
Operation