Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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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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