Altana Circular Drying Time Recorder Manual do Utilizador descarregar pdf (Página 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

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Altana Circular Drying Time Recorder Manual do Utilizador Página 5