Analysis of Printing Technology Points for Carbonless Roll Paper

With the guidance of high technology, the web printing market is now growing at its best. Especially from the mail delivery, securities, insurance, banking, commercial non-carbon copy paper, and airport tickets have special anti-counterfeiting process requirements. The following focuses on the printing and technical requirements of carbon-free carbon paper.

First, the requirements of carbonless web

A carbonless copy requires a special kind of paper, a kind of coated paper, also called CCP paper. Usually it is divided into three kinds of upper paper (CB), medium paper (CFB), lower paper (CF). Carbonless copy paper is a special paper for printing two or more computer papers and general papers. The carbonless paper (CB) refers to the paper used for the first bond of various papers. It is coated on the back with a layer of microcapsules, which acts as a downward transfer of text; while paper (CFB) is The special paper for all kinds of replication notes, its front side is coated with a layer of color reagent, the back is coated with a layer of microcapsules, as the same as the transfer of the next link to join the next role; lower paper (CF) for The last link of the various types of copying papers is only coated with a layer of coloring agent on the surface of the paper, and plays the role of taking over the contents transferred from the top copy. When printing a carbonless copying document, if it is a computer-specific document, a carbonless copy paper must be used in the reel, and more stringent technological requirements are imposed on the toughness, thickness, tightness of the paper roll, and the number of joints of the web.

Second, bill printing production scheduling process arrangements

When receiving a certain production task, the relevant production dispatcher shall design a series of optimal process plans according to the content of the process sheet, the number of colors, the number of combinations, and the amount of various auxiliary materials such as paper, especially multi-color multi-color notes. The printing must be arranged in advance in the printing sequence or color sequence.

Third, the printing process

Printing is about printing accurately. No matter what kind of printed matter is printed, it should be accurately printed, especially for printed multi-computer special carbonless copying notes. The requirements are more stringent. Computer-specific papers also need to be perforated for web printing, folding, etc. to suit computers. Whether printing a single row of holes or a double row of holes, the following points must be met according to the requirements of the computer:

(1) Use high-precision punching seats to punch through the holes. Otherwise, there will be computer card machine or printing error and other undesirable phenomena.
(2) Indentation knives are to be made of a good, sharp, sharp blade that is pressed against the desired size indentation line.
(3) When folding, fold it according to the required size.
(4) If the printing roll ticket (supermarket special reel invoice) is to be re-wrapped, the skipping skipping device must be controlled properly.
(5) Select a web with a relatively round paper roll and a relatively tight paper roll. Such printed copy paper can be overprinted accurately.

Fourth, printing ink requirements

When a ticket special printing machine prints a roll paper ticket, its speed is relatively fast, and after printing, it is not a rewind or an overlapping stack. Therefore, there are certain requirements for the selection and deployment of the ink at the time of printing.

1. Choose bright fast dry ink

When the high-speed machine is printing, it is necessary to select the light of the fast-drying type, otherwise it will not only affect the appearance of the product (low glossiness), but also affect the quality of the product (the ink is not dry and the phenomenon of back rubbing occurs). However, the drying of the ink depends on the volatility and permeability of the ink, and various auxiliary materials of the ink.

The auxiliary materials commonly used in inks include ink varnish, sizing agent, diluting agent and the like. In the printing, the main use of varnish to increase the ink flow, and the thickness of the varnish is related to the drying speed, the thicker the varnish is dried under the same conditions, because the drying speed of the varnish is The increase in the degree of thickening accelerated.

From the principle of bright fast-drying inks, its thickening process is the drying process. That is, when the varnish is used to adjust the ink, most of the reaction in the dry film formation process has been completed. This part of the reaction is performed at a high temperature, because if the oil or thin oil is thickened to the same extent at room temperature, the time required will be greatly extended, so the drying speed of the thin varnish is generally lower than that of the thick-toned ink. Slow oil. The thin oil has low plasticity, easy flow and penetration, and is coated on paper for a relatively long period of time in a flowing state, which is a resistance to film curing. The thick oil is not the same, it can be fixed and stationary, easier to film curing, so it dries quickly.

2. Ink preparation requirements

(1) The suitability of ink for printing

When the high-speed machine prints, the ink flows from the ink tank to the plate, and then the process to the substrate is the process of ink transfer and transfer separation. First of all, it is required to always be able to consistently deliver ink to the plate during high-speed printing. The second is to require that the ink on the plate always be transferred to the substrate in a certain state.

(2) Requirements for ink viscosity

The viscosity of the ink must be adapted to the entire printing process. Because the faster the printing speed, the smaller the viscosity of the ink, so in the high-speed printing process, the ink should be added to the appropriate amount of retreating agent. It is also possible to dilute the ink with a varnish (i.e., oil No. 6) to increase the fluidity and at the same time reduce the viscosity, allowing the ink to work at different temperatures and environments.

(3) Ink resistance

China's fiscal provisions with various documents, the general shelf life of 10 to 15 years, so the printing should be selected to have a special resistance to ink, namely chemical resistance, scratch resistance, heat-resistant sealing, resistance to grease, durability and so on.

The above-mentioned various relevant technical indicators are important factors for printing computer carbon-free notes. Only by doing a good job of every technical work can we obtain high-quality prints and serve the community better.

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