Abstract: Coated paper is a high-grade printing paper made of base paper coated with white paint. It is mainly used for printing covers and illustrations of high-end books and periodicals, color pictures, various exquisite product advertisements, samples, product packaging, trademarks, etc. The dimensions are 787×1092mm, 880×1230mm, and the basis weight is 70~250g/square meter. White cardboard is a strong, thick paper with a large weight. Coated paper and white cardboard each have their own advantages and disadvantages. Let’s take a look at the relevant knowledge of coated paper and white cardboard. What is coated paper
Coated paper, as the name suggests, is a type of printing paper. Its official name is printing coated paper. Its main production process is to use base paper coating and white paint. It is a common high-grade printing paper. Nowadays, many high-end books and periodicals use coated paper for their covers and illustrations. In the field of advertising, coated paper also plays an important role. Even trademarks sometimes use coated paper.
What are the grams of coated paper?
The specifications and grams of commonly used coated paper are often certain. Generally speaking, the quantitative coated paper has 100, 120, and 150 , 180, 200, 250 grams/square meter, we can choose the number of grams according to our own needs. Generally speaking, the larger the gramme of coated paper, the greater the sheet weight. If it is a flat package, there are two specifications: 787×1092 (mm) and 880×1230 (mm). Therefore, when selecting coated paper for printing in the printing factory, you only need to match the above two quantities. That's it.
Which one is better, coated paper or white cardboard?
Each has its own characteristics according to different uses.
Coated paper
Coated paper is flat paper, with dimensions of 787×1092mm, 880×1230mm, and a basis weight of 70~250g/square meter. It is mainly used for printing covers and illustrations of high-end books and periodicals, color pictures, various exquisite product advertisements, samples, product packaging, trademarks, etc.
Coated paper can be divided into single-sided coated paper, double-sided coated paper, matte coated paper, and textured coated paper. According to quality, they are divided into three grades: A, B, and C. The main raw materials of coated paper are coated base paper and coating. The requirements for coated base paper are uniform thickness, small stretchability, high strength and good water resistance. The paper surface is not allowed to have spots, wrinkles, holes and other paper defects. The coating used for coating is composed of high-quality white pigments, adhesives (such as polyvinyl alcohol, casein, etc.) and auxiliary additives. This kind of paint with high fluidity and high solid content is applied thinly and evenly on the base paper through a coater, then dried, rolled into a roll on a paper winding machine, and then sent to a super calender for pressing. Light finishing, final cutting, paper selection, and packaging.
The characteristics of coated paper are that the paper surface is very clean and flat, with high smoothness and good gloss. Because the paint used has a whiteness of more than 90%, extremely fine particles, and is calendered by a super calender, the smoothness of coated paper is generally 600 to 1000 seconds. At the same time, the paint is evenly distributed on the paper and appears white. The requirements for coated paper include high coating strength, a thin, uniform coating, and no bubbles. The amount of adhesive in the coating is appropriate to prevent the paper from de-powdering and linting during the printing process. In addition, the absorbency of coated paper to xylene It must be appropriate and suitable for fine mesh printing above 60 lines/cm.
White cardboard
White cardboard, printing paper. White cardboard is a thick paper that is strong, thick, and has a large weight. In the past, some people planned to use quantitative basis to divide: paper, cardboard and cardboard; in the early years, white thick paper with a quantitative value of about 200g/m2 (smooth surface, calendered, high stiffness, also called thin cardboard) was used in the Shanghai market. ), called heavy paper. In fact, it is also a kind of jam. The most common cardboard is not colored and is commonly called white cardboard. If it is colored, it is called color cardboard according to its color.
The main use of white cardboard is to print business cards, certificates, invitations, covers, monthly calendars and postal postcards, etc.
The surname of white cardboard is "white", so the whiteness requirements are very high. The whiteness of grade A is not less than 92%, grade B is not less than 87%, and grade C is not less than 82%. If the whiteness exceeds 90%, it will be a bit "bright and dazzling".
White cardboard also requires high stiffness, burst resistance and smoothness (except for white cardboard with patterns embossed on it). The paper surface should be smooth and free of streaks, spots, etc. disease, and no warping or deformation is allowed.