Encapsulating maps

Conservation Services at the National Library of New Zealand is
currently considering the pros and cons of various types of
encapsulation for maps.  Our main problems are expense and the bulk
of the materials, due to the lack of storage space.

We are currently investigating attaching a sheet of polypropylene to
existing folders of archival card (Archivart Library board 10pt). We
have tried both a cross welder and ultra-sonic welder, but neither
form a strong bond (Melinex forms a better bond, but is bulkier and
more expensive).  Double sided tape is not acceptable.

Does anyone know of an adhesive which will adhere polypropylene to
archival card?  Or have any other solutions to the problems of
encapsulating large, fragile maps?

Jeanette Kay
Senior Paper Conservator
National Library of New Zealand
+64 4 474 3000 x8863
Fax: +64 4 474 3035

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                  Conservation DistList Instance 12:83
                  Distributed: Friday, April 30, 1999
                       Message Id: cdl-12-83-023
                                  ***