Q&A about printing paper (197-207)

197. What are the performance characteristics of calligraphy and painting?
Answer: The calligraphy and painting paper is mainly used for writing, painting, woodcut watermarking, ancient book printing, and topography decoration. Among the technical indicators, the most outstanding performance requirement is that the whiteness is not less than 68%, and the aging-resistant whiteness (absolute value) does not drop more than 6.5%.

198. What are the performance characteristics of single-coated white cardboard?
A: Single-coated white paperboard is suitable for single-sided color printing and printing of high-end gifts and packaging boxes. Single-coated white paperboards generally require higher whiteness of the coated surface, better smoothness, ink absorbency, and print gloss. At the same time, in order to meet the needs of high-quality color printing and high-grade packaging boxes, the single-coated white cardboard itself must also have good stiffness and folding resistance.

199.What are the characteristics of cast white cardboard?
A: Cast coated white cardboard is mostly used for printing middle and high-end gift boxes and can display better decorative effects.
Its main feature is that the surface has a mirror effect similar to that of a metal surface. It has extremely high glossiness and smoothness and is suitable for fine mesh printing. It has lower tightness than coated paper, high bulkiness, good elasticity, and quick and uniform ink absorption. , not easy to powder.

200. What are the performance characteristics of the cover board and envelope board?
A: The cover board is a cardboard used for covers such as hardcover books and albums, also known as envelope cardboard and bookcase cardboard. The envelope cardboard is used for making hardcover books, important documents, precious materials, and albums.
The cover board requires a smooth surface, good moisture resistance and good dimensional stability; the envelope board requires moderate tightness, high tension resistance, and high folding endurance. Since both types of paper are thick, special care must be taken not to break or delaminate.

201. How to classify foreign writing paper?
A: The European Classification Standard divides writing paper into paper grades that use mechanical pulp as the main raw material and paper grades that use chemical pulp as the main raw material.

202. What is the main type of mechanical pulp?
A: Paper grades that use mechanical pulp as the main raw material are also known as groundwood pulp paper or groundwood pulp printing paper, including newsprint, supercalendered paper (SC paper), and coated mechanical pulp paper. Due to the different types of these papers, the proportion of mechanical pulp contained is generally between 25% and 100%.

203. What are the performance characteristics of mechanical pulp-based paper?
A: The main advantages of mechanical pulp-based papers are good opacity, good printability, and low price; their disadvantages are that they are easily returned to yellow when exposed to ultraviolet radiation and are not suitable for long-term storage.

204. What types of paper are included in newsprint?
A: Newsprint mainly includes standard newsprint and special newsprint. The latter includes telephone booklet, color newsprint, rotation newsprint and mechanical finishing special paper.
205. What are the performance characteristics of standard newsprint?
A: In European countries, the raw material for the production of standard newsprint is mechanical pulp, and the papermaking equipment is a high-speed paper machine. It uses internal calendering and applies high-temperature and linear load soft calendering to make the smoothness constant. The next, the strength is better, less hair loss.

206. What are the performance characteristics of special newsprint?
A: The improved newsprint paper is mainly used for printing high-end newspapers, newspapers, newspapers, supplements, newspapers, etc. The quantitative amount of 36 ~ 70g/m2, commonly used quantitative 52 ~ 55g/m2. Compared with standard newsprint, it has large quantification, high whiteness, good stiffness, and a higher percentage of chemical pulp content. The quantification of color newsprint is generally between 40 and 52 g/m2, which is close to that of standard newsprint. Phone book paper (TD paper) is a substitute for standard low-quantity newsprint paper. Rotational newsprint is used in newspaper supplements and commercial print catalogues. It is mainly produced and consumed in North America. The surface smoothness of the paper is better than that of standard newsprint, and the whiteness is slightly higher than standard newsprint. Mechanical finishing specialty paper is a generic term for non-coated paper, which is based on groundwood pulp. Its characteristic is that the paper is more bulky, higher in ration, and higher in whiteness.

207. Super calendered paper (SC paper) What are the performance characteristics?
A: The performance of supercalendered paper is mainly determined by the fiber raw materials, fillers and their distribution in the paper layer and bottom layer, and is usually divided into SC-A+, SC-A, SC-B, and SC-C grades. Rotary gravure type SC-A paper has tightness, smoothness, good glossiness and opacity at low basis for rotogravure; offset SC paper has good surface dry and wet strength and good gloss. , uniform ink, dimensional stability, good heat resistance and relatively low ink absorption. Compared with SC-A paper, SC-B paper has low whiteness and slightly poor surface smoothness. It is mainly used for low-grade magazines and newspaper supplements. The performance of SC-C paper is between newsprint and SC-B paper.

From: <Printing Technology>