Preservation of documents by lamination

Abstract

The chemical stability and physical properties of cellulose acetate film used to preserve and restore old or damaged documents by lamination were investigated.Pretreatment of documents with alkaline media before lamination is desirable if the paper contains an appreciable amount of acid.The lamination process does not degrade cellulose acetate film to a measurable extent.Acid-free papers are not degraded during lamination, but papers containing acid are degraded in proportion to the amount of acid present.Tissue added to the laminate increases the tensile strength and internal tear resistance, but decreases edge-tear resistance as compared to that of film alone extending beyond the paper.The loss of plasticizer with time from a cellulose acetate laminating film does not impair the properties of the laminate.Composition and performance specifications for a cellulose acetate laminating film suitable for archival use are presented.The properties of poly- ethylene and polyethylene terephthalate films of interest in connection with their possible use for the protection of documents are discussed.

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