Advanced Materials Research Vols. 314-316

Abstract: Printing RFID tag is a potential substitute for etching RFID tag as it has advantages in metal waste and substrate selection due to its addictive process. An evaluation of printing tags is conducted on their performance and reliability. It is observed that low printing tag antenna resistance results from slow printing velocity, low printing pressure, high curing temperature as well as long curing time. Printing tags have an equidistant read range with etching tags in the case of low printing antenna resistance when chips are bound to printing tag antennae. Furthermore, printing tags are comparable to etching tags in the sensitivity to environmental temperature and humidity under alternative and constant temperature-humidity tests. It is also demonstrated a weaker ability for printing tags to withstand the mechanical stress than etching tags under the bend test. Experimental results show that printing tags have better performance when their antenna resistances are low.

Abstract: Radio frequency identification (RFID) technology may be applied to cylindrical objects, but the curving of an RFID tag brings on an increase in resonant frequency of the tag antenna. The tag can not function in an excessively curving case, since the deviation of the antenna resonant frequency from working frequency makes a reduction in inductive energy supplied by a transmitter. The variation in antenna resonant frequency is dependant upon column radius of the cylinder and curving angle of the tag. Analytically, it is found that a reduction in central distance, which is determined by column radius and curving angle, between compound straight tracks leads to the decreasing of overall antenna-coil inductance after the curving of the tag. By introducing a curving turn exponent, the overall antenna-coil inductance is calculated. After neglecting the less variation in overall tag capacitance, the antenna resonant frequency may be estimated. The result provides an instruction for designing a curving tag antenna to fit the tag antenna resonant frequency for working frequency of an RFID system.

Abstract: Ball-crating micro-scale abrasion technique has been used to determine the specific wear rates of coating and substrate by only one set of tests done with the coated surface. It can also be used to test wear performance of bulk materials. Some micro-scale abrasive wear problems about soft bulk materials were investigated with multifunctional micro-wear tester by self-development. And it was compared with Ni60B coating and TiN coating having higher hardness. The formation and evolution of ridges of the abrasion scar on soft material surfaces have been studied. The formation mechanism of ridges was discussed and the influencing factors on the ridge formation were analyzed. Recommendations were made for the optimum test conditions for micro-scale abrasive wear investigation of soft materials.

Abstract: Aimed at the problem of sulfur-resistant corrosion in environment with carbon dioxide(CO2)and trace amounts of hydrogen sulfide (H2S), Tafel polarization curves and electrochemical impedance spectroscopy techniques were employed to study the electrochemistry corrosion behavior of two kinds of 80S(A and B) at different temperatures. The methods of weight-loss，scanning electron microscope and X-ray diffraction (XRD) analysis were used to study on the corrosion behavior of the sulfur-resistant tubes, including electrochemical impedance spectroscopy , average corrosion rates and the corrosion morphologies. The results showed that the corrosion potential and corrosion rates (CR) of two samples were different with the changing of the test temperatures. With the increase of the temperature, the corrosion potential decreased, and the corrosion rates increased, but decreased at 120°C. The corrosion-resistant of A80S was slightly superior to the B80S. The serious pitting corrosion and the maximum average CR occurred at 90°C. The XRD analysis suggested that the main corrosion products were FeS.

Abstract: In order to find out the relation between viscosity and adhesiveness (tack value), different rate printing varnish was respectively added to a lemon yellow ink for manufacturing several ink samples, and then their viscosity were tested. In addition, plastic viscosities of the 13 picking liquids were measured, and their tack values under 9 separation velocities were also tested. The study result showed that the picking liquid having high viscosity may be have low tack value, but printing varnish can decrease simultaneously plastic viscosity and tack value of one picking liquid.

Abstract: Experimental observations indicate that the viscosity of polymer melt flowing through micro channel is altered with variation of characteristic size of micro channels. The explanation about the trend of various viscosity is inconsistent. In this paper, the micro channel dies of 1000μm ,500μm and 350μm diameter were developed and with several polymers, including PP , PS and HDPE, depending on the capillary flow model, the measurement experiments of polymer melt viscosity were investigated at various shear rate. Test results show that with micro-channel size decrease, the percentage reduction in viscosity increases and the difference of viscosities in different micro channels reduces with increasing shear rate.

Abstract: In order to find out the variation law of ink tack during the printing, the ink tack value under 9 different linear velocities of ink distributing roller was tested with an electric ink tack-o-meter in this article, and the relation equations between tack value and the roller linear velocity were built up. The study results showed that the higher the linear speed was, the larger the tack value was, and it would stay in a relatively high tack value (regarded as infinite tack value). At the same time, the relationships between ink tack and the roller linear velocity was different for various inks, so did the infinite tack value.

Abstract: To study deeply ink penetration condition inside the paper, an ink permeability model on the basis of Kubelka-Munk theory is built up in the paper, and infer out the formula of ink penetration depth, consisting of paper thickness and various brightness. And then the test value and calculation value of ink penetration depth are compared. The study results show that the two values are almost the same, so the state of ink penetration depth can be effectively estimated just by paper brightness.

Abstract: In order to explore the influence of ink viscosity on its permeability inside paper, three newsprints and three offset paper were firstly chosen to test their basis properties, then 5 ink samples including the original ink were prepared via adding different percentage printing varnish and their viscosities were measured. Under the definite printing condition, the 5 ink samples were printed on the surface of 6 papers with a printability tester respectively. At last, the ink penetrations inside these papers were all tested with a metallographic microscope. The study showed that the decreasing of ink viscosity would lead to the increasing of ink penetration depth, and paper properties had some effects on the ink permeability.

Abstract: The wet picking and wet repellence of offset papers were studied using IGT-gst2 printability tester according to change printing conditions as printing speed and the amount of fountain solutions. It was showed that the phenomena of wet picking and wet repellence occurred in turn on the surface of offset papers with increased printing speed and the amount of fountain solution. In addition, in contrast with fountain solutions, printing speed had greater influence on the phenomena of wet picking and wet repellence of offset papers.