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Re: [BKARTS] Update on Dri-Gel sheet desiccant



I'm fairly new to the list, but this comment made me
remember a very good article on WorldPrintmakers.com.
It was an interview with Pedro Barbachano, the leading
book and paper restorer in Spain. It talked about
saving a medieval library when a pipe burst from mold
- they froze the books, then brought the temperature
up very slowly, and the water sublimated into vapor.
You can read the text of the article on:

http://www.worldprintmakers.com/wrkshops/barbeny/barbeny.htm

Not to dismiss the Dri-Gel, my thoughts just go out on
tangents.

Michelle










--- Nicholas Yeager <artifex@xxxxxxxxxxxx> wrote:

> Artifex Equipment, Inc., is moving towards
> production of its 
> breakthrough desiccant product, called Dri-Gel,
> interest in its 
> application as a disaster recovery option has
> continued to grow in 
> the preservation and disaster recovery fields.
> 
> The problem of drying wet books in a safe,
> cost-effective and 
> expedient fashion has plagued libraries for as long
> as books have 
> been collected. Although the field of book
> conservation has begun to 
> embrace new technologies, innovations have been slow
> to materialize. 
> Vacuum freeze-drying constitutes the most effective
> development to 
> date. This process requires that books be
> transported off site and 
> takes up to six months to complete.
> 
> In the Spring of 2003, Nicholas Yeager, CEO of
> Artifex Equipment, 
> Inc. investigated using a starch-based super
> absorbent polymer to dry 
> water damaged (damp and wet) library materials. This
> polymer had been 
> invented by the USDA's Agricultural Research Service
> in the 1970s and 
> has been used in agricultural as well as industrial
> applications. 
> Yeager and Kathleen Hayes, an information specialist
> at USDA's 
> National Agricultural Library,  secured a Material
> Transfer Agreement 
> Cooperative Research and Development Agreement
> (MTACRADA) to develop 
> an interleaving product to dry books using the
> polymer's capacity to 
> soak up many times its weight in water. The
> resulting product 
> invented by Yeager and Hayes has been named
> "Dri-Gel" and has 
> patent-pending protection.
> 
> The new hydrogel desiccant makes use of the chemical
> polyacrylate's ability to:
> * absorb fifty times its weight in water
> * release water through evaporation, and
> * take on water and retain it under pressure - a key
> element to water 
> removal in books
> 
> In addition to drying wet materials, Dri-Gel will
> have other 
> conservation uses.  It can be used as a poultice or
> humidity blanket 
> for relaxing brittle items because it has the
> ability to take on 
> clean water that evaporates slowly and evenly.
> 
> Dri-Gel was developed with the aid of the SBIR
> grant. The objectives 
> for this grant proposal required that the desiccant
> remain safely 
> within its enclosure, and that the product has good
> wet strength and 
> does not alter the book in any way.
> 
> Some surprising things were discovered while working
> out the method 
> of carrying the material safely into a book to dry
> it:
> * Desiccant capacity is directly affected by
> proximity. The closer 
> the desiccant is in contact to wet material, the
> quicker moisture is 
> absorbed. The chart below describes this corollary:
> 
> Interleaving Dri-Gel per number of leaves		 Time 
> required for drying
> 15 leaves (30 pages)				 12 hours/ six changes
> 10 leaves (20 pages)				   5 hours/ four changes
> 5 leaves (10 pages)				   1.5 hours/three changes
> Every page				  	   10 minutes with 1.5 hours
> 					   labor inserting Dri-Gel sheets
> 					   between leaves of the book with
> 					   no change of Dri-Gel
> 
> * Passive moisture absorption occurs in freezers
> where Dri-Gel is 
> present. Wet books awaiting treatment are placed in
> a container and 
> frozen to avoid mold growth.  Placing Dri-Gel in the
> container (often 
> a zip-lock bag) removes 50%  of the water while the
> item is stored 
> for two weeks. This lowers labor cost and drying
> time when the book 
> is finally processed
> 
> * Early tests show that Dri-Gel can be used on other
> porous materials 
> that require drying such as loose paper items and
> works of art on 
> paper.
> 
> Artifex is currently fine tuning the manufacturing
> process of Dri-Gel 
> for optimal use of the desiccant and cost-effective
> production 
> methods. Dri-Gel uses environmentally friendly
> materials, and is 70% 
> biodegradable. Yeager hopes to offer the product for
> sale by the end 
> of the year.
> 
> Visit Artifex Equipment Inc.'s website:
> www.artifexequipment.com or 
> call us at (707) 664-1672.
> 
>             
> ***********************************************
> Edelpappband / "Millimeter" Binding Bind-O-Rama,
> Entry Deadline - October 1, 2005
>                                     
>              For all your subscription questions, go
> to the
>                       Book_Arts-L FAQ and Archive.
>                                     
>           See <http://www.philobiblon.com> for full
> information
>             
> ***********************************************
> 


www.phillyart.net/michellewilson


		
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             ***********************************************
Edelpappband / "Millimeter" Binding Bind-O-Rama, Entry Deadline - October 1, 2005
                                    
             For all your subscription questions, go to the
                      Book_Arts-L FAQ and Archive.
                                    
          See <http://www.philobiblon.com> for full information
             ***********************************************


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