What is the difference between offset paper and offset paper?

What is the difference between offset paper and offset paper? 2010-07-07 11:10 Offset paper and use. Offset paper, also known as offset printing paper, is a relatively high-grade printing paper, which is generally designed for offset printing or color printing. Offset paper is divided into single-sided offset paper and double-sided offset paper, which are super calendered and ordinary calendered.

(1) The raw material of offset paper and the performance of offset paper. Offset paper is generally made from bleached chemical softwood pulp and a suitable amount of bamboo pulp. When processing offset paper, the filling and sizing are heavy. Some high-grade offset papers are also surface sizing and calendering. Because the principle of ink and ink balance is used in offset printing, the paper requires good water resistance, dimensional stability and strength. Offset paper is mostly used for color prints. In order for the ink to recover the color of the original, it must have a certain degree of whiteness and smoothness. Offset paper is generally used to print pictures, color illustrations, trademarks, covers, ring linings, high-end books and volumes. In recent years, due to the improvement of people's culture and living standards, book materials have also developed to higher grades, and more and more books and magazines have been printed using offset paper. Because the offset paper is white, crisp, and smooth, the books and books are clearly written and the books are flat and not easily deformed. Compared with bald editions and newsprint books, the grades are particularly different, and they are highly appreciated by readers and users. The number of book books bound with offset paper will increase substantially in the future to meet the needs of the market.

(2) Specification of offset paper. Offset paper specifications are the same as those on the two previous papers. Other specifications can visit the national standard GB147 "printing, writing and drawing the size of the base paper", size error, skewness must not exceed ± 3mm. There are many kinds of calibrating offset paper, the commonly used quantitative is 60,70,80,90,120,150,180,200,250g/m2. The offset printing papers of printed books are all below 90g/m2, and the cover use is between 70-200g/m2. Offset paper has the characteristics of crispness, smoothness, etc. It is easy to bind and process. 1 When you hit a page, you can use any method to achieve a good clean-up effect. 2 Any folding machine can achieve good folding effect, especially suitable for high-speed folding. 3 Offset paper books This book should be designed with the following fold pages (never design four fold pages). It is best to use two fold (80g/m2 or more) and then post it, because the thickness of the offset paper is large and the amount is too large. Inconsistent cuts, unequal book block quality problems. 4 When the iron wire is stapled with the same number or thickness as a bald version, the diameter of the medium wire is required. 5 The viscosity of the adhesive is larger (thick) than that used for bald paper because of the large amount of offset paper, the smooth surface, the low (dilute) viscosity, and poor adhesion or shedding. 6 hardcover book block core paper is not easy to round, ridge, especially when thicker posts. Because the offset paper is slippery, it is easy for each signature to be exposed and the front mouth has a trapezoidal appearance after being rounded. When the ridge is raised, the creasing in the creases cannot be smoothed due to the manual ramming, which results in defective products. 7 The production of books with offset paper is generally of a higher grade, so the cover material should be better than the book core material to match the inside and outside of the book. 4. Dictionary paper and use. Dictionary paper, also known as thin bald paper, is a low-volume paper that is specialized in printing dictionaries. Using this paper can reduce the cost of the book.

(1) The raw materials of dictionary paper and the performance of dictionary paper. Dictionaries are made from bleached chemical pulp and a small amount of straw, sized or lightly sized and calendered. As the books printed on dictionaries are often dictionaries and other reference books, these books have the characteristics of small writing, thick writing, frequent use, etc., and the papers for the epidemic must have the corresponding strength, resistance to folding, and smoothness. The product achieves clear, beautiful and long service life. Dictionaries can be used to print dictionaries, reference books, and scientific and technological literature. Its characteristics are: thin and soft paper, the same thickness of books and magazines can accommodate 30% -50% of graphics, can reduce costs.

(2) Dictionary paper specifications. There are two kinds of dictionary paper packaging, in which the web length is generally 6000m, the width is generally 787mm, 850mm, 880mm; flat paper has 1092mm×787mm, 1168mm×850mm, 1230mm×880mm. Dictionary paper width and skewness, national standards allow tolerance ± 3mm. The dictionary paper has a small amount of quantification. There are several commonly used 30, 35, 40, 42g/m2, which can be selected according to needs.

(3) Attention to dictionaries in binding. Dictionaries have a thin paper texture and are prone to moisture absorption. After moisture, water ripples and wrinkles appear, and the edges of the paper are curled. This shortens the service life and inconveniences the binding processing. 1 The method of page crash should be accurate, generally use the wrong type, do not try to impact type, avoid collision force over the edge of the ambassador's paper, hair curl, the paper file is not easy to neat and affect the quality of the next process and finished products. 2 Machine folding should not use high-speed or fence-type folding machine folding, because of thin paper, easy to tear page waste. 3 The suction force of the suction nozzle should not be too large when using the machine to avoid double posts or tearing. 4 when the lock line, the use of cross-lock method, should not use flat lock, flat lock lines and more easily make the book back after the lock is too high, and the height of the book block surface is not easy to process the gap. 5 When cutting the finished product, the angle α of the knife should be less than the degree of cutting other paper, to avoid the knife edge is not smooth after cutting. 6 Use the same adhesive as bald paper. 5. Coated paper and use. Coated paper is also called coated paper. It is a paper made by coating and calendering on raw paper. This paper can print fine high-end products.

(1) Coated paper raw materials and coated paper performance. Coated paper is mainly bleached wood pulp, or mixed with appropriate amount of bleached pulp to make paper, coated (paint consists of pigment, barium sulfate, calcium carbonate, rubber, glycerin, gloss agent, etc.), dry, super Calendered higher-grade printing paper. Coated paper has both single and double sides. In recent years, there have been light copperplate paper and matt copperplate paper, among which most of the lightless copperplate paper is imported. The whiteness, strength and smoothness of coated paper are better than those of other papers. It is currently the best one for printing. Coated paper is mainly used for printing portraits, art albums, high-end illustrations, trademarks, book covers, calendars, high-end products, and corporate presentations. In particular, the printing of dull coated paper is even more elegant.

2) Coated paper specifications. Coated paper is generally flat-panel packaging, there are two commonly used format, namely 1092mm × 787mm, 1230mm × 880mm, the national standard provides a skewness of ± 3mm. The basis weight of coated paper is generally between 80 g/m2 and 250 g/m2.

(3) Matters needing attention when binding coated paper. Coated paper has the characteristics of hard paper, high surface smoothness, large quantitative, etc. The production of books and periodicals has more albums and larger format, which increases the difficulty and labor intensity of binding processing. Therefore, the processing must be strictly controlled to ensure the product quality of books and periodicals. 1 Any folding machine can be folded, but it is aborted at most and has to cut the air. Fold 2% off, 1 fold off the best (re-encapsulate), in order to prevent the occurrence of eight-character folds in the signature, manual folding is generally two fold (re-encapsulate) or a fold, folding plate should not be sharp, scratching force should not be too large Avoid scratches. 2 The pinhole should not be too large (locking) too deep (hand-lock sawing) when the sewing line is locked, so as to avoid the wrong signature or glue leakage after the glue. 3 The viscosity of the used adhesive should not be too large (sticking to a single page) to adhere to the surface and not adhere to the surface coating. 4 When cutting, it is not appropriate for the book to be thick. Because the paper has large sliding force, it is easy to move after collision. The angle α of the cutter is the same as that of offset paper, generally 23° can be used. 5Copper paper has more fillers and is not resistant to folding. Once creases or scratches are not easily restored to flatness, they become brittle after exposure to the sun, and are easily adhered to wet and moldy due to moisture. Therefore, the temperature of the factory building and the warehouse and the humidity of the storehouse To be appropriate.