Paper properties and binding process (below)

4, dictionary paper and use . Dictionary paper, also known as thin letterpress 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.

Since the books and books printed on dictionaries are often dictionaries and Other reference books, these books have the characteristics of small writing, thick writing, and frequent use. Therefore, the paper must have corresponding strength, degree of folding and smoothness, so that the printed products can reach Clear and beautiful writing, long service life requirements.

Dictionaries can be printed with dictionaries, reference books, scientific and technical literature, and other publications. Its characteristics are: thin and soft paper, the same thickness of books and magazines can accommodate 30% to 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 three specifications. 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) Precautions when dictionaries are bound. Dictionaries are thin, soft, and easily hygroscopic. After moisture, water ripples and wrinkles appear. The edge of the paper is curled and the service life is shortened. This inconveniences the binding processing.

1 The method of bumping pages should be correct. Generally, it should be done in a wrong manner. It should not use percussive type as far as possible to avoid collisions and curls over the edges of the ambassador's paper. The paper roll is not easy to neat and affects the quality of the next process and the finished product.

2 Machine folding should not use high-speed or fence-folding machines to fold pages, because the paper is soft and easy to tear.

3 The suction force of the suction nozzle should not be too large when using the machine to avoid double lines or tearing.

4 when the lock line, the application of cross-lock method, not hand-locked, flat lock lines and more easily make the book back after the lock is too high, and the book block surface height difference is not easy to process.

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 letterpress 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 man-made bleached straw to make paper, coated (paint consists of pigment, barium sulfate, calcium carbonate, rubber, glycerine, 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 the best type of printing paper available. Coated paper is mainly used for printing portraits, art albums, high-end illustrations, trademarks, book covers, calendars, high-end product introductions, 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) Precautions 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 managed to ensure the quality of books and periodicals.

1 Any folding machine is evenly folded, but it is a maximum of three fold and requires air to be cut off. 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 To avoid scratches.

2 The pinhole should not be too large (locked) too deep (lock the silver mouth) when the sewing line is locked, so as to avoid the wrong copy of the book or the 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.

5 coated paper more filler, not folding, once creases or scratches are not easy to restore smooth, easy to become brittle after exposure to the sun, easy to adhere to moisture, mildew and scrapped, so plant, warehouse temperature and relative humidity to appropriate.

6, writing paper and use . Writing paper is a paper similar to an offset paper and is mainly used for writing pen characters and the like. Writing paper is bleached chemical pulp, or a small amount of chemical bamboo pulp and stem fiber pulp, made of sizing paper.

The paper of writing paper is softer and more flexible than offset paper, and is generally not used for color printing. It is mainly used for printing forms, exercise books, books, notebooks, and a part of papers. The size of writing paper is basically the same as that of relief paper, and the basis weight of paper is generally 45 to 80 g/m2.
Writing paper is generally not used as printing paper for books, and most of them are used for various books and the like. The binding notes for writing paper are the same as those for letterpress paper.

7, copy paper and use. The copy paper is thinner than the dictionary paper, the paper is very soft, the surface is smooth and flat, with translucency. The packaging is in the form of a flat plate, and the format of the web is basically the same as that of a general flat paper. The light weight is 15, 17, and 19 g/m 2 , respectively.

The copy paper is generally used as a guard sheet for photo albums, a guard sheet for a stamp album, and the like. Because the copy paper is thin and soft, it should be noted when binding:

1 It is not advisable to use a percussion type when hitting a page, so as to avoid damage to the edges of the paper and to wrinkle the folds, resulting in irregular pages.

2 The adhesive should not be too thick, and the effect of excessive viscosity is not good. When sticking the cross-cut paper, it must be leveled, so as not to affect the appearance quality when the adhesive is not firm or wrinkled.

3 copies of paper is a decorative paper, as a guard sheet and album collection, should remain flat and clean.

8, wrapping paper and use. There are two kinds of wrapping paper. One is kraft paper, which is generally made of sulphate wood pulp. The paper is yellow-brown and resembles the color of leather, so it is named kraft paper. Kraft paper is tough, full of certain elasticity, good strength, resistance to folding, pulling, and has good water resistance, it is suitable for packaging. Kraft paper has one-sided and two-sided distinctions, and its basis weight is 40-120g/m2. When used, it can be selected according to the needs of the packaged goods. The kraft paper used for binding is used in addition to the booklet of packaging, because its paper has a certain degree of toughness, it can also be used as a cover back paper for back cover paper and book cover, and it can also be used as the cover of a bound newspaper.

Another common type of wrapping paper is so-called single-sided false kraft paper. The color of the paper is basically the same as that of kraft paper. The raw material is mainly straw pulp. When the paper is made, it is not sizing. The strength, toughness, and moisture proofness are not as good as those of kraft paper, but the price is cheaper than kraft paper. This kind of paper is mainly used to pack the booklet, which is used for packaging, and is sometimes used as a cover sheet or cover for loose-leaf notebooks.

9, rice paper and use. Paper is a kind of traditional paper with paper soft, not easy to break, good ink absorption, no aging, brittle, small deformation, the surface is white.

The main raw material of Xuan Paper is Tan Leather, cotton, and a small amount of straw, which are made after processing. The production and processing of rice paper is complex. The production cycle is as long as 300 days. Its paper has a certain unique performance, so its price is more expensive than other papers. It has a long history and is mainly used for writing, painting and copying. The Xuan Paper wood version watermark enjoys a high reputation internationally.

Xuan Paper Division (layer) Xuan, double (layer) Xuan, three (layer) Xuan, its specifications in the past are based on the city standard, such as the four-foot single declaration, five feet three declared, six feet double Xuan and so on. The current professional standards stipulate that the rice paper specifications are in centimeters (cm). There are mainly 138cm×69cm, 153cm×84cm, 180cm×97cm, 248.4cm×124.2cm, 367.5cm×144.9cm and 503.7×193.2cm. Difference ±0.3cm.

Xuan paper is mainly used for reel loading, partial folding, and thread loading in binding processing. Reel loading and processing is mainly combined with the roll bottom, the edge (or the bottom) and become a scroll book or an ornament. It is difficult to process the escalation technique of the reel, and a slight oversight would result in the damage of a treasure. Therefore, it is required that the occupant has certain skills to be competent.

10, pattern paper and use. Pattern paper is a type of paper with various patterns on the surface that has been produced in recent years. During the production, the plant fibers are mixed and added into the base paper, and the pattern paper is processed by soaking (or not soaking), embossing, and creasing.

Pattern paper is a kind of high-grade paper, which has the characteristics of novel surface pattern, many style colors, soft folding resistance, good strength, no discoloration, durability and easy preservation, wide use and so on. There is still a certain gap between the pattern paper produced in China and the advanced level in foreign countries, and it remains to be developed in the future.

Source: Paper Business