[Nhcoll-l] Heatsealer

Thu Jan 21 09:53:52 EST 2021

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<mailto: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<mailto:maru.digi at gmail.com>>; rachael at amartconservation.com<mailto:rachael at amartconservation.com>
Cc: Nhcoll-l at mailman.yale.edu<mailto: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] On Behalf Of Lennart Lennuk
Sent: Thursday, January 21, 2021 9:45 AM
To: Mariana Di Giacomo <maru.digi at gmail.com<mailto:maru.digi at gmail.com>>; rachael at amartconservation.com<mailto:rachael at amartconservation.com>
Cc: Nhcoll-l at mailman.yale.edu<mailto: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]
Sent: Wednesday, January 20, 2021 6:17 PM
To: rachael at amartconservation.com<mailto:rachael at amartconservation.com>
Cc: Lennart Lennuk <Lennart.Lennuk at loodusmuuseum.ee<mailto:Lennart.Lennuk at loodusmuuseum.ee>>; Nhcoll-l at mailman.yale.edu<mailto: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<mailto: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<mailto:rachael at amartconservation.com>

From: Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu<mailto: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<mailto: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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