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<div class="moz-cite-prefix">Hi Dorothy,<br>
<br>
one basic consideration surely is stability of plastics (no matter
which type of plastic) in the long run (speaking in decades and in
dependence of storage conditions). We do know that (high quality
archival) paper is durable even over centuries, what we also know
is that (for dry collections) laser printing (=melting of pigments
into fibre texture of the slightly rough archival paper surface)
is a very durable printing method, and that the combination
produces (again - for dry collections) very reasonable results.
"Printing" is always the combination of printing medium and
printing method, and thus label issues in general are always
related to either bad printing medium quality (e.g. poor paper
quality) or improper printing methods (based on environment &
medium).<br>
<br>
For thermal transfer printing, my impression is that we are / have
been testing various options at the moment, but we don't know what
the result is once we are old, grey and retired ... ;-)<br>
<br>
I don't know if there are any "archival" ISO-standards for thermal
transfer printing, but any ribbon based printing (as far as I
know, but my knowledge might be limited here) is a resin-coating
method rather then imprinting <u>into</u> the medium. Even though
polypropylene is one of the more stable plastics, polymer chains
tend to crack down based on the environmental conditions. Paper
consists of more then 30 chemicals, among them acids and
formaldehydes used in paper production which might trigger
addition/condensation reactions which could potentially crack down
polymer-chains and thus - in the long run - the label and/or its
coating. I would use such a labelling method only if the settings
are clear (= are there any potential chemical issues arising from
the herbarium sheets that could negatively affect labels?).<br>
<br>
Hope this gives some guidance, but maybe I am too sceptical and
there is more specific experience from botany collections out
there ?<br>
<br>
All the best<br>
Dirk <br>
<br>
<br>
<br>
Am 11.07.2014 17:36, schrieb Sweeney, Patrick:<br>
</div>
<blockquote cite="mid:CFE57C27.2AE84%25patrick.sweeney@yale.edu"
type="cite">
<pre wrap="">Posted on behalf of a colleagueŠ
On 7/10/14 9:45 AM, "Dorothy J. Allard" <a class="moz-txt-link-rfc2396E" href="mailto:djallard@uvm.edu"><djallard@uvm.edu></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi folks,
We are looking for a print-on-demand (printing one label at a time)
method of annotating herbarium sheets. Can anyone share their
experience with thermal transfer label printers (_not_ direct thermal)
using wax resin ribbons and polypropylene labels? I am particularly
interested in the community's opinion on the likelihood that such
labels will be readable for the long term and will not break down.
We are considering the purchase of a Zebra GC420t printer, wax/resin
ribbons and polypropylene labels.
Thanks!
--
Dorothy J. Allard, Ph.D.
Assistant Curator and Virtual Herbarium Coordinator
Pringle Herbarium
Torrey Hall, 27 Colchester Ave.
Burlington, VT 05405
(802)656-3221
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</blockquote>
<pre wrap="">
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<pre class="moz-signature" cols="72">--
Dirk Neumann
Tel: 089 / 8107-111
Fax: 089 / 8107-300
email: Dirk.Neumann(a)zsm.mwn.de
Postanschrift:
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Zoologische Staatssammlung München
Dirk Neumann, Sektion Ichthyologie / DNA-Labor
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81247 München
Besuchen Sie unsere Sammlung:
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---------
Dirk Neumann
Tel: +49-89-8107-111
Fax: +49-89-8107-300
email: Dirk.Neumann(a)zsm.mwn.de
postal address:
Bavarian Natural History Collections
The Bavarian State Collection of Zoology
Dirk Neumann, Section Ichthyology / DNA-Lab
Muenchhausenstr. 21
81247 Munich (Germany)
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