[Nhcoll-l] Heatsealer

Thu Jan 21 11:23:26 EST 2021

Hi,

Just adfing my two cents: We use a foot pedal heat sealer so that making
large bags for oddly-shaped specimens is also possible.

As for insect mortality rates, the big deal is to shock-freeze at once,
i.e. put the objects in their bags into a working freezer which is
immediately closed. This should prevent any pests from developing
cold-resistance. If the procedure is properly applied, any survivors are
likely to be due either to not low enough temperatures or an extremely
resistant species. *Most* species shouldn't survive minus 28 degrees or
lower. There are mortality rate publications. Double freezing is intended
to catch new hatchlings from eggs, rather than kill any hatched larvae or
adults from the first freeze. The two-week interval in between the fist and
second freeze is supposed to alliw for hatching, so if this procedure is
followed specimens should not be taken out of their sealed bags.

Best wishes to all,

Gali

בתאריך יום ה׳, 21 בינו׳ 2021, 16:54, מאת Lennart Lennuk ‏<
Lennart.Lennuk at loodusmuuseum.ee>:

> Thank you!
>
>
>
> So, would you say that -30C is too much? Is there a reason why to use -20C?
>
>
>
> Best!
> Lennart
>
>
>
> *From:* Taylor, Sarah [mailto:sarah.taylor at uconn.edu]
> *Sent:* Thursday, January 21, 2021 4:41 PM
> *To:* Lennart Lennuk <Lennart.Lennuk at loodusmuuseum.ee>
> *Cc:* Nhcoll-l at mailman.yale.edu
> *Subject:* RE: [Nhcoll-l] Heatsealer
>
>
>
> Hi Lennart,
>
>
>
> At our herbarium, we follow the general protocol you outlined. The bags we
> use most frequently are large zip-top polyethylene bags, so we don’t need
> to use any tape. We don’t always do a double freeze, depending on
> circumstances. Our freezer is set to -20C.
>
>
>
> We have a set of enormous bags without zip tops that we use for large
> herbarium boxes. When I arrived, the convention was to seal them shut with
> tape, but I got frustrated at how the tape wrecked the bags. Now I twist
> the bag opening very tightly and cinch hard with string, and I’m much
> happier.
>
>
>
> Cheers,
>
> Sarah
>
>
>
>
>
> -----------------------------------------------------------------
>
> Sarah Taylor, PhD
>
>
> Collections Manager, CONN
>
> George Safford Torrey Herbarium
> Department of Ecology and Evolutionary Biology
> *University of Connecticut*
> 75 North Eagleville Road, Unit 3043
> Storrs, Connecticut 06269-3043
> U.S.A.
>
> P: 860.486.1889
> F: 860.486.4320
> http://bgbaseserver.eeb.uconn.edu/
>
>
>
>
>
>
>
> *From:* Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> *On Behalf Of *Lennart
> Lennuk
> *Sent:* Thursday, January 21, 2021 3:33 AM
> *To:* Mariana Di Giacomo <maru.digi at gmail.com>;
> rachael at amartconservation.com
> *Cc:* Nhcoll-l at mailman.yale.edu
> *Subject:* Re: [Nhcoll-l] Heatsealer
>
>
>
> *Message sent from a system outside of UConn.*
>
>
>
> In addition – for freezing I have used PVC electric tape – stays on the
> plastic but also comes off without need to brake the blastic bag.
>
>
>
> How do your institutions treat herbariums? This far we have but them into
> cupboard box, one layer polyethylene bag and then freezed -24 one week,
> then 1-2 days out and freezed again one week at -24 Celsius.
>
>
>
> Also I read that the freezing time and temperature needed to kill pests
> depend on the species. Does anybody have experience with *Psocoptera*,
> *Corrodentia* or *Copeognatha*?
>
>
>
> Best!
> Lennart
>
>
>
>
>
>
>
> *From:* Nhcoll-l [mailto:nhcoll-l-bounces at mailman.yale.edu
> <nhcoll-l-bounces at mailman.yale.edu>] *On Behalf Of *Lennart Lennuk
> *Sent:* Thursday, January 21, 2021 9:45 AM
> *To:* Mariana Di Giacomo <maru.digi at gmail.com>;
> rachael at amartconservation.com
> *Cc:* Nhcoll-l at mailman.yale.edu
> *Subject:* Re: [Nhcoll-l] Heatsealer
>
>
>
> Hi!
>
>
>
> Thank you a lot. This has been great help!
>
>
>
> I believe I plan also some low-ogygen treatments. So what kind on
> heat-sealer to use and does it need 3-phase electricity?
>
>
> Best!
> Lennart
>
>
>
> *From:* Mariana Di Giacomo [mailto:maru.digi at gmail.com
> <maru.digi at gmail.com>]
> *Sent:* Wednesday, January 20, 2021 6:17 PM
> *To:* rachael at amartconservation.com
> *Cc:* Lennart Lennuk <Lennart.Lennuk at loodusmuuseum.ee>;
> Nhcoll-l at mailman.yale.edu
> *Subject:* Re: [Nhcoll-l] Heatsealer
>
>
>
> Hi Lennart,
>
>
>
> I have to second Rachael's comments. Make sure you are not leaving any
> holes while you are doing the taping and the specimens will be well
> protected before going into the freezer. The difference between freezer and
> low oxygen in this sense is that in both cases if you see the hole, it's a
> problem, but microholes are a problem for low-oxygen but not an issue for
> freezing, so heat sealing is not necessary.
>
>
>
> Best,
>
> Mariana
>
>
> *Mariana Di Giacomo, PhD*
>
> *Natural History Conservator, Yale Peabody Museum*
>
> Co-chair, Emerging Professionals Committee, SPNHC
>
> Associate Editor, Collection Forum, SPNHC
>
> Secretary/Communications APOYOnline
>
>
>
>
>
>
>
> El mié, 20 ene 2021 a las 9:52, <rachael at amartconservation.com> escribió:
>
> Hello Lennart,
>
> Obviously I cannot speak for anyone else, but the majority of colleagues I
> know who freeze specimens as a remedial pest measure wrap them in
> polyethylene plastic that is secured with packing tape rather than sealed
> with a heat sealer.  I know that some people have investigated which tapes
> do well in low-temperatures, but I have found that most good quality
> packing tapes will survive the process and keep the plastic sheeting in
> place.  This is in contrast, of course, to low-oxygen treatments where a
> good seal for the barrier films require a heat sealer of some type.
>
> Sincerely,
>
> Rachael
>
>
>
>
>
> Rachael Perkins Arenstein
>
> A.M. Art Conservation, LLC
>
> Conservation Treatment, Preservation Consulting & Collection Management
>
> Tel: 917-796-1764 (she/her/hers)
>
> www.amartconservation.com
> <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.amartconservation.com%2F&data=04%7C01%7Csarah.taylor%40uconn.edu%7C8ceb31743b4141b8a38008d8bde72841%7C17f1a87e2a254eaab9df9d439034b080%7C0%7C0%7C637468147833837751%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=C6swC6D6i4TlnDU0HL0OGRmJ6a%2BQn1ESzW6RD%2FgyMOI%3D&reserved=0>
>
> rachael at amartconservation.com
>
>
>
> *From:* Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu> *On Behalf Of *Lennart
> Lennuk
> *Sent:* Wednesday, January 20, 2021 3:51 AM
> *To:* nhcoll-l at mailman.yale.edu
> *Subject:* [Nhcoll-l] Heatsealer
>
>
>
> Hello!
>
>
>
> What kind of heatsealers you use for sealing stuffed animals before
> sending them to freezers (getting rid of pests for example)?
>
> Does the heatsealer need three-phase electricity?
>
>
>
> Head!
> Lennart
>
>
>
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