Coated paper industry in the printing industry
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Coated paper is one of the fastest growing varieties in China's paper market in the past 10 years. Coated paper, as a substrate for printing, is a high-grade product in the field of cultural printing paper, and is a paper made by coating and finishing the printing coated base paper. Over the years, the low-quantity coated papers that have arisen overseas have been very popular for commercial printing and publishing users because of their low basis weight (the total amount is not over 60g), the low cost, and the good printing machine. Printing of magazines, newspaper advertisement inserts, supermarket catalogue promotion, etc.
In the past 10 years, the annual increase rate of the amount of coated paper and machine-coated paper in China has been 18.8% and 25%. It is not difficult to estimate, following the inheritance and mediation of China's economy, and the further improvement of the level of people's living, the use of coated paper in China will surely rise rapidly. Therefore, in the printing of coated paper, the deep understanding of the printing suitability of coated paper, especially the research on the adaptability of coated paper printing, will have extraordinary and realistic meaning, which can be divided into coated whiteboard. Paper, gray coated paper, etc.
First, the basic situation of coated paper
Coated paper is a coating liquid coated with a rescue solvent such as pigments, adhesives, tackifiers, fluorescent agents, lubricants, etc. as the primary factor in the appearance of the base paper. After drying, the coating is rewarded and rewarded. It has excellent functions.
Pigment coated paper is the most important and most stressful of coated paper. Pigment coated paper is therefore mainly composed of white pigments such as kaolin, calcium carbonate, barium sulfate and titanium dioxide, plus various types of adhesives and coatings formulated with various chemical repellents as necessary, uniformly coated in a certain amount. Made of cardboard. Offset printing coated paper, commonly known as copper paper. The name of the copper paper has a long history. The original construction of the letterpress mesh is made of heavy metal copper. This type of printing plate is suitable for printing such coated paper, so it is called copper paper. This paper is a high-grade printing paper which is produced by coating and finishing a base paper. Offset printing coated paper is mostly used to print all kinds of high-quality printed matter, such as calendars, pictorials, pictures, illustrations, advanced grades, product imitations, etc.
Second, the printing suitability of coated paper
The printing suitability of paper includes two aspects: fitness and quality. The suitability of homework mainly affects the printing effect, and the quality suitability mainly affects the printing end. As far as the school's homework suitability is concerned, the paper's tensile strength, toughness, flatness and deformability are related to its close relatives. The whiteness, opacity, slipiness, appearance strength, dimensional invariance and ink acceptability of the paper are related to the quality and appropriateness of the relatives. Customs refer to the print quality of paper as narrow printability.
Compressibility
The paper is slightly compressed after being subjected to an inevitable pressure. After the external force is removed, the degree to which the paper gauge restores the condition is called compressibility. Compressibility is related to the small pressure. Paper compressibility is especially stressful for printing. Due to the inevitable pressure of the paper during printing, the ink is transferred from the printing plate to the paper. Compressible paper, when the printing pressure is appropriate, can make the graphic and the paper surface have a rich and elastic elastic snoring, so that the graphic on the printing plate can be clearly transferred to the paper. . Because of the presence of a coating on the coated paper, the compressibility is as small as usual. The thicker the coating, the less compressive it is. In all cases, the coated paper has a poor print definition. Low-coated paper has a low coating amount (6g/O per side), and the base paper contains a mechanical pulp with good compressibility (any ratio ≥25%), plus the use of soft calender finishing, compression ratio Coated paper is good, so its printing machine can be good. In addition, the paper with good compressibility can also lower the requirements for the smoothness of the paper and the flatness of the appearance of the graphic.
2. Appearance strength
The strength of the paper is an intense indicator of printability. It refers to the degree of contact between the paper fiber structure, the filler and the compound, and the choice of the paper to resist wear, powder loss and anti-pilling when printed.
For coated paper, the coated particles must be bonded to each other. The coating and the paper base are required to be adhesive and strong, and there should be sufficient contact strength between the paper-based fibers. Otherwise, when the paper is smashed with the ink film on the plate at a relatively fast rate under the responsive printing pressure, the ink film will peel off the coating particles and the small fibers, which cause so-called hair loss and loss of powder signs, resulting in efficacy. Paste. In the offset printing coated paper, there are also signs of loss of powder and loss of hair due to the high viscosity of the offset printing ink.