Uncoated paper, also referred to as offset printing paper, is a premium-grade printing substrate primarily utilized for offset printing in book production and color plate applications. It can be categorized into single-sided and double-sided varieties, with options including super calendered and ordinary calendered finishes.

(1) The raw materials and performance characteristics of offset paper are crucial. Typically composed of bleached coniferous wood chemical pulp combined with an appropriate proportion of bamboo pulp, the manufacturing process may involve filling agents and heavier sizing; some high-end variants also undergo surface sizing and calendering processes. Given the ink balance principle employed in offset printing, this type of paper must exhibit excellent water resistance, dimensional stability, and strength. Offset paper is predominantly used for color prints; thus, it necessitates a certain level of whiteness and smoothness to ensure that inks retain their original hues. Common applications include picture books, color illustrations, trademarks, covers, linings, high-quality publications—reflecting a trend towards higher-grade materials driven by rising cultural standards among consumers. As such advantages as brightness quality along with crispness contribute to clear text presentation post-binding while maintaining flatness without deformation; compared to letterpress or newsprint publications which differ significantly in grade appeal—offset printed works have garnered favor among readers and users alike. Consequently, the volume of books and periodicals bound using offset paper is expected to rise substantially in response to market demands.

(2) Specifications for offset paper align closely with those established for other types within national standard GB147 "Printing, Writing & Drawing Base Paper Sizes," where size deviations should not exceed ±3mm. Various grammages exist for quantitative measures ranging from 60g/m² up to 250g/m²; typically under 90g/m² for interior pages while cover weights range between 70-200g/m² are common due its crisp texture facilitating easy binding processes:
i) Any method applied yields favorable results regarding page cleanliness.
ii) All folding machines achieve optimal folding outcomes particularly suited for high-speed operations.

(3) When designing books or periodicals utilizing offset paper it’s advisable to adhere strictly to three-fold configurations (avoid four-fold designs). A double fold (80g/m² or greater) followed by setting posts is recommended since thicker stock increases bulkiness leading potentially toward fig-eight wrinkles or dead folds that complicate stretching/unfolding resulting uneven cuts across book blocks post-trimming.

(4) For similar thicknesses between letterpress papers—the diameter of wire should be larger when dealing with increased pagination.

(5) Binder viscosity must surpass that used on uncoated papers due largely because smoother surfaces present lower adhesion properties risking detachment after application especially noticeable during hardcover assembly where rounding/ridge formation becomes problematic if excessive thickness occurs causing potential ladder-shaped gaps at spine edges upon completion leading creases unable smoothing through manual intervention ultimately yielding defective products.

7 In producing books from offset papers generally classified at higher grades—it’s essential that cover materials surpass those utilized within book blocks ensuring cohesive aesthetic alignment throughout publication design.