sundex process
A British process of laminating a paper document.
The process utilizes semi-transparent glassine
paper in lieu of cellulose acetate foil, with the
three components of the "sandwich," i.e., the
document and the two sheets of glassine being
sealed together with an aqueous adhesive, such as
carboxymethylcellulose (C. M. C.) or starch paste.
The sandwich is then consolidated by pressing it
between heated surfaces. The Sundex process is
safer than conventional LAMINATION in that an
operating temperature below 100° C. is
needed in place of the much higher temperature
required in conventional laminating. In addition,
the treated document need only be soaked in water
(assuming the document itself is not sensitive to
aqueous solutions) for delamination to take place.
Another important advantage claimed for the
process is that the components of the sandwich are
closely related materials, and the adhesive is
compatible with both. The final sandwich is
therefore more mechanically and chemically
homogeneous than the usual laminated sandwich, and
consequently less liable to unbalanced stresses
due to changes in moisture content and temperature
of the surrounding atmosphere. (198 )
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