The Feture of Carbonless copy paper ink printability

The Feture of Carbonless Copy Paper ink printability

The performance of carbon-coated carbon ink must first meet the requirements of the printing process, and it has the characteristics of good printability, difficulty in picking up, strong rewriting capability, and stable performance. There are mainly the following indicators for evaluating the printability and performance of carbon-coated replication inks.

1. Flow performance (transfer performance)

2. Anti-backing performance

3. Repeatability

4. Pollution performance

5. Penetration performance

6. Gloss

In the printing process, the viscosity of the ink is closely related to the transferability of the ink. Generally, the higher the speed of the ink, the faster the ink separation speed. The viscosity of the ink is required to be properly reduced, otherwise the transfer effect is not satisfactory. In addition, the surface strength of the paper is low, and the viscosity of the ink is also required to be low, otherwise paper picking may easily occur. Therefore, in the production process, in order to ensure the printing effect and obtain a smooth ink layer, the viscosity of the ink must be strictly controlled, and the printing temperature is appropriately adjusted.

The ink transferred from the printing plate to the paper, if the fixing time is not sufficient, the ink layer is not completely dried, the ink on the previous printing product can be easily transferred to the back of the next printing product, causing the back of the ink to be dirty. The degree of back-scratching is mainly related to the adhesion of the ink to the paper and the cohesion of the ink. In addition, the thixotropy of the ink also has an effect on the back-scratch prevention performance.

Reproducibility refers to the fact that the ink is peeled off by pen pressure or printing and transferred to the underlying paper. This is an important use performance of carbon paper, which determines the number of rewritable bonds. The factors affecting the ink rewriting performance include the hardness of the ink, the content of the mineral oil in the formulation, the cohesive strength of the auxiliary binder, and the paper properties.

Back-scratching occurs during the printing process, and contamination occurs during use and storage. When the copying ability of the copy paper is strong, since the softness and the characteristic adhesiveness of the ink itself increase, the contamination performance also increases, and there is a possibility that the outside of the copying portion is contaminated. It is conventionally considered that the method of increasing the hardness of the ink can reduce the adhesion, but in fact, the reproducibility of such an ink, the clarity of the multi-pass reproduction may be reduced

Paper is made of fibers intertwined with many pores of different sizes and shades. During the printing process, the ink is pressed into the larger pores of the paper under the influence of the printing pressure, and it penetrates through the capillary action of the pores of the paper. Penetration is beneficial to the fixation of the ink on the paper, but excessive penetration will cause “printing out” and “powdering” and reduce the quality of the printed product. The most common fault in reprinting ink printing is “printing through”. The main reason is that the texture of the paper is loose and the oil absorption is too strong; the printing temperature is too high and the ink viscosity is too low. "Through print" will destroy the balance ratio between the linking material and the pigment and reduce the softness of the ink film, thus affecting the rewriting effect.
To prevent the occurrence of these two kinds of failures, the most effective method is to make the distribution of paper capillary pores and the distribution of ink pigment particles suitable. In addition to the selection of special carbon-coated carbon copy base paper, it is also possible to adjust the composition and proportion of the linking material to obtain a formulation that has a good ability to maintain the grease, so that it has a suitable viscosity and drying speed, and even if printed at a high temperature, it will not happen. "Printing through" and "powdering" phenomenon.

The glossiness of the carbon-coated ink ink layer affects the appearance quality of the printed product. The glossiness is good, the color is bright, the ink layer is smooth, and the print grade is high. The gloss of the carbon-coated ink layer is determined by the carbon-coated printing process and the ink formulation. In addition to proper control of the temperature of the carbon-coated printing, the ink formulation can also be improved, for example, by selecting a wax with high gloss. Improve the gloss of the product.

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