Today we will talk about the difference between coated paper and offset paper in printing.
The raw materials of coated paper and the properties of coated paper:
Coated paper is generally made of bleached chemical softwood pulp and the appropriate amount of bamboo pulp. When processing coated paper, the filling and sizing are heavier, and some high-grade coated papers need surface sizing and calendering. The coated paper uses the principle of water and ink balance when printing, so the paper needs to have good water resistance, dimensional stability and strength. Coated paper is mostly used in color prints. In order to restore the color of the original manuscript with the ink, a certain degree of whiteness and smoothness is required.
Coated paper is generally used for printing picture albums, color illustrations, trademarks, covers, ring linings, high-end books and books, etc. In recent years, due to the improvement of people's culture and living standards, books and materials have also developed to a higher level, and more and more books, periodicals, books, etc. are printed on coated paper.
Because the coated paper has the advantages of white quality, crispness, flatness and fineness, the text is clear after the book is made, and the book is flat and not easily deformed. Compared with the bald edition and newsprint books and periodicals, the grade is exceptionally different, and it is deeply welcomed by readers and easy-to-use. The number of books and periodicals bound with coated paper will increase substantially in the future to meet market needs.
Specification of coated paper:
The specifications of coated paper are the same as the above two papers. For other specifications, you can visit the national standard GB147 "Size of Base Paper for Printing, Writing and Drawing". The size error and skewness are not allowed to exceed ±3mm. There are many kinds of weights for coated paper, and the commonly used weights are 60, 70, 80, 90, 120, 150, 180, 200, 250g/m2. The coated paper for printed books and periodicals is below 90g/m2, and the cover is between 70-200g/m2.
Coated paper has the characteristics of stiffness and smoothness, and is easy to bind and process.
1. Use any method when hitting the page to achieve a good page hitting and tidy effect.
2. Any folding machine can achieve a good folding effect, especially suitable for high-speed folding.
3. Coated paper books and periodicals should be designed with three-fold pages or less (four-fold pages should never be designed). It is best to fold it in two (above 80g/m2), because the copperplate paper is thick, the basis weight is large, and the number of folds is too large. The book signature is easy to have a figure-shaped wrinkle or a dead fold that is not easy to stretch, resulting in the book after cutting the book. Uneven cuts, unequal quality of book blocks.
4. When the number of pages or thickness of the iron wire is the same as that of the flat paper, the diameter of the medium or large iron wire should be used.
5. The viscosity of the adhesive is larger (thicker) than that used for bald paper because the weight of the coated paper is large, the surface is smooth, and the viscosity is low (thin) and it will not stick firmly or fall off after sticking.
6. The hardcover book block of coated paper is not easy to round and spine, especially when the post is thick. Because the copperplate paper is slippery, it is easy to expose each signature after rounding, and the front mouth is rounded to appear a ladder shape; when the spine is lifted, the creases in the crease cannot be smoothed, resulting in defective products.
7. Books and periodicals made of copperplate paper are generally of higher grade, so the cover material should be better than the book block material to match the inside and outside of the book.
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