ALTANA Circular Drying Time Recorder User Manual

Page 5

Operation:

After running several tests on known materials
under controlled conditions, the operator can very
easily correlate results obtained with the Circular
Recorder and by the ﬁ nger-touch method for
determining the following stages of drying:

1. Set-to-touch: During the ﬁ rst stage of drying,
the ﬁ lm is mobile and partially ﬂ ows back into the
scribed channel. The ﬁ lm may be considered „set-
to-touch“ when it no longer ﬂ ows back and the
stylus begins to leave a clear channel.

2. Surface-dry: When the Teﬂ on stylus no longer
leaves a clear channel, but begins to rupture the
dry upper layer of the curing ﬁ lm, the surface is
considered to be „dust-free“.

3. Through-dry: Finally, when the stylus no longer
ruptures or dents the ﬁ lm, but moves freely upon
the surfact, the cross-section of the ﬁ lm may
be considered to have reached the „dryhard“
condition.

Features:

1. Uniform Pressure: The counter-poised pivot arm
maintains a load on the teﬂ on stylus of exactly 12
grams. This pressure corresponds to the point of
„through-dry“ described above because, at this
stage, a continuous ﬁ lm can be lifted from the
panel completely intact.

2. Non-Sticking Stylus: The replaceable teﬂ on
stylus provided with this model reduces sticking
and tearing to a minimum, thus producing sharp
and clear endpoints.

3. Transparent Scale: The plastic template is
transparent and permits both the center of rotation

Operation