Papers by Author: Bei Qing Huang

Abstract: In order to find the suitable materials for the production of flexographic through 3D printing in hybrid light curing system through formula design. Several resins are selected as pre-polymer, prepared for the light-curable ink and tested its viscosity, surface tension, flexibility, curing speed and the volume shrinkage and other properties, to determine the optimal ratio of pre-polymer mixing system through recipe testing, which laid a solid foundation for the materials for the development of flexographic production through 3D printing technology.

Abstract: The white ink commonly serves as render ink in printing, and its covering property (CP), which is assumed to be influenced by the dispersion, plays a key role in color reproduction on the film surface. In order to research on the relations between dispersivity and CP, inks with different dispersion are prepared by changing the preparation process. The inks’ particle size and distribution are tested before it is coated onto the surface of covering property test paper. The morphologies of inks film are studied through SEM to examine the white ink’s dispersion and its influence on CP. The result shows that well dispersed inks have fine particle size and tend to uniformly distribute. There is hardly any agglomeration found on the well dispersed ink’s SEM image which is supposed to account for its high CP.

Abstract: To solve the existent stability difficulties in the long term storage of the silver nanoparticle hydrocolloids (AgNPs) , this paper makes a comprehensive investigation on the effects of different synthetic methods which influence the stability of AgNPs. The controlled AgNPs are prepared by two kinds of precursors: silver diamminohydroxide ([Ag (NH₃)₂]OH ) and silver nitrate (AgNO₃ ) respectively precursors;in addition the stability of the AgNPs hydrocolloid is studied by UV-vis; A discovery was found after contrast :the particle sizes of the [Ag (NH₃)₂]OH precursor based AgNPs hydrocolloid are more uniformed,well controlled and of better dispersibility.this kind of AgNPs exhibits higher stability compared to the AgNO₃ precursor based AgNPs hydrocolloid.

Abstract: With the development of printing technology, greater emphasis has been laid on environmentally friendly materials. Due to its printability and environmental friendliness, Water-based flexo ink is gradually gaining popularity at home and abroad, and has been widely applied in the field of printing. Different from other kinds of bills, scratch-type invoices have an additional scratch area on the surface, which highly covering performance is required for the ink applied. This paper emphatically analyzes and discusses: (a) flexo water-based covering ink and its application in scratch-type invoice covering region printing; (b) how to explore and evaluate new developed green inks. Compared with traditional inks, the water-based flexo ink is free of emissions of volatile organic compounds (VOC), and its popularization might have significant meanings for the environment protection and sustainable development.

Abstract: Plastic UV frosted ink is a novel frosted ink used for the plastic substrate,As a kind of environmental printing ink, plastic UV frosted ink is attracting more attention in the application of the food packaging printing Adherence is an important performance of Plastic UV frosted ink which has directly effect on the quality of the coating and the following process. Different prepolymers, monomers and additives plastic UV frosted ink samples prepared to test their adhesion on PET substrate,explores the prepolymer, kind and content of monomer and additives for plastic UV frosted ink adhesionThe results showed that type and content of the prepolymer, monomer and additives had significant effect on the adhesion force of ink. Adhesion force of sample prepared by polyurethane prepolymer was the best. The higher degree of functionality, volume shrinkage was greater, the adhesion force was worse. An appropriate amount of additives could improve the adhesion force of ink.

Abstract: Ink used in food packaging printing graphic,it's one of the most important factors that affect the safety of packaging food,as a new environmentally friendly printing ink,UV-curable inkjet ink has attracted much attention in the application of food packaging printing .The pros and cons of performance of UV ink's color paste is the key to the preparation of UV inkjet ink.In order to prepare UV inkjet magenta ink's color paste with good dispersion,design formulation experiment for monomers in UV ink's paste,determine the monomer type and content,by changing the ratio of pigment to resin and milling time as well as the kind and the content of dispersants to prepare based ink, by testing the diameter size to evaluate dispersion of UV ink's paste.It has been proved that the monomer type and content is the key factor that influences the dispersion property of UV ink's based ink. The dispersion property of the resin to pigment depends on a great extent on the ratio of resin to pigment,milling time also play an important role. The result also proved that different kind of dispersants and content are also important factors that influence the dispersion property.

Abstract: The thickening after preparation phenomenon of ink refers to the viscosity of ink after preparation is constantly changing during its storage process. The appropriate increase of ink viscosity during its storage plays an important role in preventing the particles of pigment sedimentation. The utility of the ink is negatively affected by the rise of viscosity of ink that is over a certain range during the process of storage. The rise is a result of the broken of the system stability owing to some physical and chemical factors. In order to improve the stability of ink during its storage, not only the viscosity changes of ink prepared by pigment and resin with different kinds of functional group during storage are measured, but also the chemical factors contribute to the thickening after preparation phenomenon of ink are analyzed. What is more, the viscosity changes of ink prepared by different constituent content during storage are measured, and the physical factors lead to the thickening after preparation phenomenon of ink are analyzed as well. According to the research results, the functional groups of pigment and resin set off a chemical reaction in alcohol system, which is the main reason for the thickening after preparation phenomenon of ink. The constituent content of ink is the essential physical factor that influences the thickening after preparation phenomenon of ink.

Abstract: The formation of color images are generally divided into two methods: additive color imaging based on color light mixture and subtractive color imaging based on colorant mixture. Additive color imaging refers to the color image mixed by a certain percentage of the three primary color lights: red (R), green (G) and blue (B), such as LED display, cell phone screens, digital cameras and others. Subtractive color imaging refers to the color image generated by light mixture reflected by each colorant, due to some light of different wavelength in the white light separately absorbed by certain colorant after mixing a certain percentage of the three primary colorant: cyan (C), magenta (M) and yellow (Y). Inkjet, color laser printing, inkjet printing, etc. belong to the subtractive color imaging. Most commonly, printing also belongs to the subtractive color imaging. This thesis is based on the characteristics that fluorescent materials can produce colors under UV excitation, designing and preparing three fluorescent inkjet inks which can respectively produce red (R), green (G), blue (B) under UV light excitation, using inkjet printers to print color images, investigating the imaging mechanism of the additive color based on fluorescence inkjet printing, and observing the imaging results. The results show that color effect of monochrome image is good, and the color deviation is large after overlapping different colors.

Abstract: This paper is to determine the effects of various factors on the color fastness to crocking of inkjet printing ink. Firstly, the affects of curing conditions on color fastness to crocking were discussed by altering curing temperature and curing time separately. Secondly, considering curing conditions as a constant, study the affects of the pH of ink, the amount of adhesives and the varieties of adhesives on color fastness to crocking by changing these factors respectively. The results show that: the color fastness to crocking of printing fabric is better when curing temperature is 1800C and curing time is 90s; the wet crocking fastness of printing fabric declined as the pH of ink increased; the color fastness to crocking of fabric printed with ink which prepared use water-based polyurethane is better than use water-based polyacrylate.

Abstract: The infrared absorbing inkjet ink is composed of infrared absorbing materials, resin, assistant agent and solvent that has a great influence on the main performance of the ink. Based on the consideration of environmental factors, five alcoholic solvents were chosen and prepared into ink samples respectively. The effect of different solvents on the properties of the ink was discussed. Then the ink sample was prepared by the most optimal proportion of blends with solvent through the principle of formulating of recipe, the printing sample was attained and tested. The experiments showed that the solvents had a great influence on the properties of the viscosity, infrared absorption strength, surface tension of infrared absorbing ink, which directly affected the ink-jet printing eligibility and security effect. The developed ink has good performance and security effect.