Offset paper and use. Offset paper, also known as offset printing paper, is a kind of high-grade printing paper, which is generally used as an offset printing machine for book or color printing. Offset paper is divided into single-sided and double-sided offset paper, and there is super calendering, ordinary calendering.
(1) The raw material of offset paper and the performance of offset paper. Offset paper is generally made of bleached chemical coniferous wood pulp and the appropriate amount of bamboo pulp. When processing offset paper, the filling and sizing are heavy. Some high-grade offset paper should be coated and polished. Because the principle of ink and water balance is adopted in printing, the paper needs to have good water resistance, size stability, and strength. Offset paper is mostly used in color printing. In order to make ink recover the original color, it is required to have a certain whiteness and smoothness. Offset paper is generally used for printing picture albums, color illustrations, trademarks, covers, ring lining, high-grade books, and this volume. In recent years, due to the improvement of people's culture and living standards, books materials have also developed to high-grade, and more and more books are printed with offset paper. Because of the advantages of the offset paper, such as white, straight, and smooth, the book is made with clear text and flat and not easy to deform. Compared with bald edition and newsprint, the grade is particularly different, which is popular with readers and easy to use. The number of books bound with offset paper will increase in large quantities in the future to meet the needs of the market.
(2) Specification of offset paper. The specifications of offset paper are the same as the previous two types of paper. Other specifications can be visited in GB gb147 "size of the original paper for printing, writing and drawing", and the size error and deviation shall not exceed ± 3mm. There are many kinds of offset paper, and the commonly used quantitative is 60, 70, 80, 90, 120, 150, 180, 200, 250G / m2. The offset paper of the printing and publication is below 90g / m2, and the cover is 70-200g / m2. The offset paper has the characteristics of straightness and smoothness and is easy to be installed and ordered. ① Any method can achieve a good page cleaning effect when hitting pages. ② Any folding machine can achieve a good folding effect, especially suitable for high-speed folding. ③ Offset paper book and publication volume, design time
It should be mainly under three-fold pages (four-fold pages shall not be designed). It is better to set the pastes after twofold (80g / m2) after the paper is thick and quantitative. The excessive folding of the book is easy to produce the octagonal fold or the dead fold which is not easy to extend and expand, which causes the uneven incision and unequal quality of the book core after the book cutting.
④ When the number of pages or thickness of the wire is the same as that of the bald paper, the diameter of the medium and large iron wire shall be required. ⑤ The viscosity of the adhesive is larger than that used for baldness paper, because the offset paper has a large quantity, smooth surface, low viscosity (thin), and is not firm or falling off after sticking. ⑥ The hardcover core of offset paper is not easy to round and ridge, especially when the thickness of the paste is thick. Because the offset paper is slippery, it is easy to expose each book post after rounding, and the front mouth circle appears ladder shape; when ridging, it also causes the inferior products due to manual smacking, which makes the folding inside the crease unable to be smooth.
⑦ Offset paper is generally of high grade in making books and periodicals. Therefore, the cover material should be better than the core material, so that the book can match the inside and outside of the book. 4. dictionary paper and use. Dictionary paper, also known as thin paper, is a low quantitative paper specialized in printing dictionaries. Using this paper can reduce the cost of books and periodicals.
(1) The raw materials of dictionary paper and the performance of dictionary paper. Dictionary paper is made of bleached chemical wood pulp and a small amount of straw pulp, which is made by sizing or light sizing and calendering. As the books and periodicals printed by dictionary paper are usually tools such as dictionaries, these books have the characteristics of small handwriting, thick books, and frequent use. The paper of the epidemic article should have corresponding strength, folding resistance and smoothness, so as to make the printed products clear and beautiful, and have a long service life. Dictionary paper can print dictionaries, tool books, scientific and technological documents, and other books and periodicals. The features are: thin paper and Ruan, the same thickness of books and magazines can accommodate more than 30% - 50% of the text and text, which can reduce the cost.
(2) Specification of dictionary paper. There are two kinds of packaging for dictionary paper, including 6000m long web paper, 787mm, 850mm, and 880mm wide, 1092mm × 787mm, 1168mm × 850mm and 1230mm × 880mm flat paper.
The width and deviation of dictionary paper shall be ± 3mm according to the national standards. The quantity of dictionary paper is small, and the commonly used ones are 30, 35, 40, 42g / m2. It can be selected according to the needs.
(3) Dictionary paper in binding when the attention. The paper of the dictionary is thin and easy to absorb moisture. After being wet, there will be water ripple wrinkles, and the edges of the paper are easy to curl, which shortens the service life, which brings some inconvenience to binding processing. ① The method of page collision should be accurate. Generally, the wrong movement type is used, and the impact type is not used as far as possible. The impact force is not too strong to curl the hair on the side of the ambassador paper, and the paper stack is not easy to be neat, which will affect the quality of the next process processing and the finished book and periodicals. ② It is not suitable to use high speed or fence folding machine to fold pages when folding machines. Because of the thin paper Ruan, it is easy to tear the pages and cause waste. ③ When using a machine to match pages, the suction force of the suction nozzle should not be too large, so as to avoid double or tear pages. ④ When locking, the cross lock method should not be used. The flatlock line is easy to make the back of the book too high, and the height of the book core is not easy to process. ⑤ The angle of cutter A shall be less than the degree of other paper when cutting finished products, so as to avoid the unevenness of the knife-edge after cutting. ⑥ Use the same adhesive as the baldness paper. 5. copperplate paper and its use. Copper paper is also called coating paper. It is on the original paper, coated, calendered paper. This paper can print fine high-end products.
(1) The raw material of the copperplate paper and the performance of the copperplate paper. Copperplate paper is a kind of high-grade printing paper that is mainly bleached wood pulp or mixed with appropriate bleached stamp pulp. It is made of high-grade printing paper which is coated (paint is composed of pigment, barium sulfate, calcium carbonate, glue, glycerin, gloss, etc.), drying, and super calendering. There are two sides of the paper, and in recent years, there are also light and non-gloss paper, most of which are imported. The whiteness, strength, and smoothness of copperplate paper are better than other paper, which is the best one in printing. Copper paper is mainly used for printing portraits, art albums, high-grade illustrations, trademarks, book covers, calendars, high-end products, enterprise introductions, etc. Especially the printing of matte copperplate paper is more elegant and extraordinary.
2) Specification of copperplate paper. The paper is generally flat plate packaging, and there are two kinds of paper in common use, namely 1092mm × 787mm, 1230mm × 880mm, and the deflection degree specified by national standards is ± 3mm. The quantitative value of the copper paper is generally between 80g / m2 and 250G / m2.
(3) Copper paper in binding when the attention. The paper is hard, smooth, and quantitative. The books and periodicals are made with more picture books and larger sizes, which increases the difficulty and labor intensity of binding. Therefore, the processing must be strictly controlled to ensure the quality of books and periodicals. ① Any folding machine can be folded, but it can be folded up to three-fold and there should be a cut-off to exhaust air. Fold twofold and one fold is the best (set up the post again), so as to prevent the eight-character fold in the book post. The manual folding page is generally twofold (and then set the post) or one fold. The folding plate should not be sharp and the scratch should not be too strong to avoid scratches. ② The clockwise hole of the lock line should not be too large (machine lock) too deep (hand lock saw), so as to avoid the wrong movement of book post or leakage of glue after glue. ③ The viscosity of the binder used should not be too large (when the single page is stuck), and the surface coating shall not be glued after sticking. ④ When cutting, it is not suitable to stack too thick books, because of the paper sliding force, easy to move wrong after the collision. The angle of cutter a is the same as that of offset paper, and generally, 23 ° can be used. ⑤ The copper plate paper is packed with many fillers, which is not resistant to folding. Once there is a crease or scratch, it is not easy to recover flat, and it will become brittle after being exposed to the sun, and it is easy to adhere to the moisture and mildew, and it will be scrapped. Therefore, the temperature of the workshop and warehouse and the humidity of the swallow shall be appropriate.