Size Presses

Surface sizing is commonly used on grades of paper and board that will be coated and/or printed. The traditional purposes of surface sizing have been to improve the sheet’s resistance to the penetration of fluids and to improve certain sheet properties. Traditionally, a starch-based sizing solution is applied to both sides of a fully dried sheet in a two-roll nip at a "size press" that is located between drying sections. This course discusses the design and functions of a size press.

•List the two traditional purposes of surface sizing •List some of the materials that can be used in surface sizing solutions •Identify and describe pond-style size press designs, including vertical, horizontal, and inclined size presses •List sheet variables that affect the performance of pond-style size presses •List sizing solution variables that affect the performance of pond-style size presses •List equipment variables that affect the performance of pond-style size presses •Identify and describe film-type size press designs •List the advantages of film-type size presses over pond-style size presses •Identify and describe safety hazards and safety guidelines for size presses