Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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sizing

1. A property of a material stemming from an alteration of its surface characteristics, which, in the case of paper, pertains to fiber characteristics. In so far as internal sizing of paper is concerned, it is a measure of the resistance of the paper to the penetration of water and/or various liquids, e.g., ink; while in terms of surface sizing, it refers to the increase of properties such as water and abrasion resistance. abrasiveness, creasibility, finish, printability, smoothness, and surface bonding strength, as well as a decrease of porosity and surface fuzz. 2. The process of adding materials to a papermaking furnish or the application of materials to the surface of a paper or board to provide resistance to the penetration of liquids and, in the case of surface sizing, to affect one or more of the properties listed under 1. Traditionally, papers are BEATER SIZED ,SURFACE SIZED and TUB SIZED .

Papers are generally classified into three groups according to sizing; unsized, weak-sized, and strong-sized. Unsized papers are WATERLEAF (1) ; weak-sized papers are SLACK SIZED ; and strong-sized papers are HARD SIZED . Blotting paper is an example of waterleaf, while sized newsprint is slack sized, and bond paper is hard sized.

Rosin sizing is the principal size used for machine-made papers, while gelatin is often used for handmade papers. 3. The application of a sizing material, e.g., albumen, to the edges of a book before laying on the gold leaf. 4. The process of applying size (glair) to the covers of a book or directly into the blind impressions before tooling in gold. 5. The process of sorting books similar in size into batches for treatment. (17 , 52 , 62 , 67 , 161 , 309 , 320 , 350 )




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