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Sizing or size is any one of numerous specific substances that is applied to or incorporated in other material, especially papers and textiles, to act as a protecting filler or glaze. Sizing is used in papermaking and textile manufacturing to change the absorption and wear characteristics of those materials; it is the term used for oil-based surface preparation for gilding (and is also known as ''mordant'' in this context); and it is used by painters and artists to prepare paper and textile surfaces for some art techniques. Sizing also refers to the process of including or applying the substance. == Papermaking == Sizing is used during paper manufacture to reduce the paper's tendency when dry to absorb liquid, with the goal of allowing inks and paints to remain on the surface of the paper and to dry there, rather than be absorbed into the paper. This provides a more consistent, economical, and precise printing, painting, and writing surface. This is achieved by curbing the paper fibers' tendency to absorb liquids by capillary action. In addition, sizing affects abrasiveness, creasibility, finish, printability, smoothness, and surface bond strength and decreases surface porosity and fuzzing. There are three categories of papers with respect to sizing: ''unsized'' (''water-leaf''), ''weak sized'' (''slack sized''), and ''strong sized'' (''hard sized''). Waterleaf has low water resistance and includes absorbent papers for blotting. Slack sized paper is somewhat absorbent and includes newsprint, while hard sized papers have the highest water resistance, such as coated fine papers and liquid packaging board. There are two types of sizing: ''internal sizing,'' sometimes also called engine sizing, and ''surface sizing'' (tub sizing). Internal sizing is applied to almost all papers and especially to all those that are machine made, while surface sizing is added for the highest grade bond, ledger, and writing papers. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sizing」の詳細全文を読む スポンサード リンク
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