This is a message from the Museumpests List. To post to this list send it as an email to [email protected] To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Thanks Gretchen-
I am glad to read that you feel the method works- have you found extending the freezing period is what makes this successful? Dana On Sat, Mar 10, 2012 at 8:20 PM, Anderson, Gretchen <[email protected]> wrote: > This is a message from the Museumpests List. > To post to this list send it as an email to [email protected] > To unsubscribe please look at the footer of this email. > ----------------------------------------------------------- > Dana - > > In addition you need to realize that boxes of archives are very dense - and > that paper is very good insulator. In fact, shredded paper is used to > insulate houses in northern climates. Given that, it is not surprising that > it took time to reach the the desired temperature. Be patient - the method > works. > > Gretchen Anderson > Conservator > Carnegie Museum of Natural History > ________________________________ > From: [email protected] [[email protected]] on behalf of > [email protected] [[email protected]] > Sent: Saturday, March 10, 2012 8:58 PM > To: [email protected] > Subject: Re: [pestlist] Freezer Trucks > > This is a message from the Museumpests List. > To post to this list send it as an email to [email protected] > To unsubscribe please look at the footer of this email. > ----------------------------------------------------------- > Dana - > > First of all, the temperature does not have to reach -20F in 4 hours. It > should reach 32F in 4 hours. That's sufficient. The reason you use a truck > capable of maintaining -20F, is it will reach the desired 32F in 4 hours. > Once the liquid in adults, larvae, and eggs reaches a freezing temperature, > ice particles form and destroy the cellular structure of the living > organisms. Unless you're dealing with "book worms", which I doubt you are > with archival records, any insects found in these materials will certainly > be killed. When freezing anything, you're trying to beat insects from > forming natural defenses to freezing. I think your process worked fine. > Have you found any live insects? > > I have had plenty of sucessful freezing episodes with freezer trucks, > containers, and warehouses. > > Tom Parker > > > -----Original Message----- > From: dana senge <[email protected]> > To: pestlist <[email protected]> > Sent: Sat, Mar 10, 2012 8:41 pm > Subject: [pestlist] Freezer Trucks > > This is a message from the Museumpests List. > To post to this list send it as an email to [email protected] > To unsubscribe please look at the footer of this email. > ----------------------------------------------------------- > We recently tried using a freezer truck to process a large number of > boxes of archives. Record boxes were stacked in rows with 12" gaps > between the rows to allow for air circulation. We placed a datalogger > in the center of one of the boxes of archive materials (in the center > of the truck) and another outside the boxes to measure the temperature > of the air in the truck box. The results were surprising. > > We had been informed that the truck would go down to -20 degrees F in > 4 hours. Our data loggers showed that it took 10 hours for the air in > the truck to go from 44 degrees F to -15 degrees F, and the > temperature inside one of the record boxes took ~96 hours to drop from > 70 degrees to -15 degrees. (The boxes had been in a 72 degree > environment before being placed in the truck box). It appears that > the starting temperature of the boxes of paper was more difficult to > reduce than I expected. And the truck never achieved the desired > temperature. > > We are very disappointed in these initial results and are trying to > figure out if there is a different strategy for using a freezer > truck, or if this is just not feasible for freezing densely packed > materials, such as paper packed in a record box. We are discussing > packing boxes half full and packing the truck to allow for even more > air circulation. But it seems that getting to the goal of -20 degrees > F in 4 hours may not be feasible. > > Does anyone have any positive experiences working with a freezer truck > for processing a large quantity of materials? Especially dense > materials such as wood or boxes of paper? > > > Thanks, > > Dana Senge > Assistant Conservator > National Park Service > Intermountain Region Museum Services Program > Tucson, AZ 85745 > 520-791-6432 > [email protected] > > > ---------------------------------------------------------------------- > To send an email to the list, send your msg to [email protected] > > To unsubscribe from this list send an email to [email protected] and > in > the subject put: > "unsubscribe" - no quotes please. > > You are receiving the Pestlist emails in standard mode. > To change to the DIGEST mode send an > email to [email protected] with this command in the body: > > set mode digest pestlist > > Any problems email [email protected] or [email protected] > > > ---------------------------------------------------------------------- > To send an email to the list, send your msg to [email protected] > > To unsubscribe from this list send an email to [email protected] and > in the subject put: > "unsubscribe" - no quotes please. > > You are receiving the Pestlist emails in standard mode. > To change to the DIGEST mode send an > email to [email protected] with this command in the body: > > set mode digest pestlist > > Any problems email [email protected] or [email protected] > > The information contained in this message and/or attachments is intended > only for the person or entity to which it is addressed and may contain > confidential and/or privileged material. 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