Study on rheological properties and printing adaptability of water-based ink
Date: Dec 27 2023 From: Star Color
As an environmentally friendly printing material, water-based ink is more and more widely used in the printing industry because of its non-toxic, tasteless and pollution-free characteristics.The rheological property of water-based ink is one of its important physical properties, which has an important impact on the printing adaptability of ink.In this paper, the rheological properties and printing adaptability of water-based ink will be deeply studied in order to provide theoretical support for the production and printing application of water-based ink.
Rheological properties of water-based ink
Rheological property refers to the deformation and flow properties of a substance when subjected to external forces.The rheological properties of water-based ink mainly include viscosity, thixotropy, yield value，etc.
Viscosity
Viscosity is a physical quantity that measures the ease of flow of a fluid and represents the ability of a fluid to resist shear forces during flow.The viscosity of water-based ink is affected by temperature, pigment concentration, resin content and other factors.In the printing process, the size of the viscosity directly affects the transfer and leveling of the ink.
Thixotropy
Thixotropy refers to the ability of a fluid to deform easily under the action of an external force and recover to its original state at rest.The thixotropy of water-based ink is affected by shear rate, temperature, pigment concentration and other factors.Good thixotropy is conducive to the flow and transfer of ink in the printing process.
Yield value
The yield value is the minimum stress required for the fluid to start flowing.The yield value of water-based ink directly affects the ink quantity control and ink transfer in the printing process.Understanding and mastering yield value is helpful to optimize printing process and improve printing quality.
Printing adaptability of water-based ink
Printing adaptability refers to the ability of ink to cooperate with printing materials and printing equipment, which directly affects the appearance and quality of printed matter.The printing adaptability of water-based ink mainly includes the following aspects:
Adaptability of ink and substrate material
1.When the water-based ink is in contact with the substrate of different materials, its adhesion, adhesion fastness and permeability performance are different.Understanding and mastering the interaction law of ink and substrate materials is helpful to select the appropriate ink and substrate materials, and improve the adhesion and durability of printed matter.
2.Adaptability of ink and printing equipment
There are differences in the adaptability of water-based inks on different printing equipment, such as lithography, gravure printing, screen printing，etc.In practical applications, it is necessary to adjust the rheological properties of the ink according to the characteristics and requirements of the printing equipment, so that it can adapt to the process requirements of the printing equipment and improve the printing efficiency and quality.
3.Drying and curing of ink
The dryness of water-based ink has an important effect on the friction resistance and durability of printed matter.Understanding and mastering the drying mechanism and influencing factors of ink is helpful to optimize the drying process, control the drying speed, and avoid problems such as poor drying or cracking of printed matter.In addition, for prints that require higher durability, it is also necessary to pay attention to the curing performance of the ink, and select the appropriate curing methods and conditions to improve the durability and stability of the print.
In this paper, the rheological properties and printing adaptability of water-based ink are studied deeply, and the effects of rheological properties such as viscosity, thixotropy and yield value on the printing process, as well as the interaction between ink and substrate materials and printing equipment are expounded.In practical applications, it is necessary to comprehensively consider the rheological properties of water-based inks, the characteristics of substrate materials and printing equipment, optimize the printing process, and improve the appearance and quality of printed matter.Looking forward to the future, with the continuous improvement of environmental awareness and continuous innovation of technology, the application prospects of water-based ink will be broader.Future research can carry out in-depth research on new materials, new formulations, new processes and other aspects of water-based ink, and make greater contributions to promoting the application and development of water-based ink in the printing industry.
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