Synthesis, characterization, and antibacterial activity of azodyes incorporated acridine chromophore and their applications in polyester printing

A series of azo dyes incorporated acridine chromophore labelled as 8 (a-d), 10 (a, b), 12 and 14 were prepared in very good yields starting from 9-chloroacridine 1 followed by amination, diazotization and coupling either with rhodanine analogues 6 (a, b) or other coupling partners 9 (a, b), 11 and 13. FT-IR, 1H NMR, and mass spectroscopic analysis were used to establish the structures of the produced azo dispersed dyes. Moreover, the synthesized azo dyes were used to prepare pastes that were used to print polyester fabric using classic silk-screen printing techniques. The dyes were tested for color strength and fastness properties, and they showed good fastness resistance to washing, rubbing, and perspiration, as well as fastness to sublimation and light. The dyes were further screened for their in vitro antibacterial activity against both Gram (+) and Gram (-) bacterial species. Most of them showed promising activities against these tested organisms.

Tendencies of the Ukrainian Authorial Silkscreen Development in the Global Context

This article examines the history of the silkscreen, a printing technique which has been widely spread in the art practice during the last century. The author names artists who have influenced the creation of the authorial silkscreen in Ukraine and presents facts which allow for characterizing the process of the authorial silkscreen development in Ukraine. The article highlights the key tendencies of the Ukrainian authorial silkscreen development in the global context. The author has applied the descriptive and comparative historical research methods in order to reveal the key stages of this technique development and adoption. This is the first research that describes the process of the Ukrainian serigraphy development. It proves that the screen printing became an independent means of artistic expression in the 20th century – after the invention of the silkscreen technique with a light sensitive stencil. For the last 100 years, it has turned from a purely industrial technique to a notable phenomenon of fine arts. The serigraphy development is roughly divided into the following five periods: “zero”, “dead”, “early”, “active” and “modern”. Ukrainian artists first started to experiment with this technique in the 1960s, in the active period, according to the above-mentioned classification. If compared to the global trends, Ukraine has adopted the serigraphy rather late. In the 1990s, the importance of the authorial silk screen printing in the Ukrainian fine arts was growing. At the time, the studio under the guidance of Volodymyr Veshtak was founded to provide artists with the opportunity to master this technique. Nowadays, owing to private studios, such as “Open Silkscreen Studio”, “Seri/Graph”, “Copy #0”, and the festivals that they hold, a new wave of the silkscreen has emerged and spread among Ukrainian artists. Nevertheless, the screen printing is still not a frequently used technique in the Ukrainian fine arts. Therefore, there is a need for making the research and promoting foreign and local experiences of the authorial silk printing.

Research on Multioperator silk screen printer Based on Communication Protocol Macro

Multioperator silk screen printer is automatic silk screen printing equipment. There are many advantages, such as energy saving, reduce the labor intensity and so on. The control system consists of an intermittent movement main motor and eight color working station printing cycle motion motors. The system controls nine frequency converters through protocol macro communication by using PLC. This paper studies the principle and process characteristics of multioperator silk screen printer. Besides, this paper adopts protocol macro sequence generation method for communication between PLC and frequency converter. This method can control the programming of parameters, such as frequency, operation and monitoring. It also can realize the printing of eight color working stations and monitor the printing status in real time. The practical application proves that the method meets the technical requirements and the reliability is good.