Nano-composite film possesses antibacterial properties of nanomaterials and preservation performance of food packaging film. The goal of this work was to explore the potential application of nano-silver-containing polyvinyl alcohol (PVA) composite film in grape fresh-keeping. Mechanical properties, transparency, barrier performance and antibacterial activity of Nano-silver-containing PVA film were tested and results showed that the antibacterial zone diameter of nano-silver on Aspergillus niger was 14.4 mm, with minimum bactericidal concentration of 75 ppm. The PVA antibacterial membrane effectively revealed antibacterial properties. Moreover, the decreased mechanical properties and transparency enhanced barrier performance of antibacterial membrane compared with PVA film. For comparison, the fresh-keeping effects of non-packaging film, commercial cling wrap and nano-silver-containing PVA film on sensory score, mass loss rate, decay rate, Ascorbic Acid (Vc) content and titratable acid content were also studied. Results indicated that the PVA antibacterial membrane significantly effectively avoided sensory score, water, decay, Ascorbic Acid (Vc) and titratable acid in grapes during storage, and had a remarkable effect in prolonging grapes' shelf life due to its breathability and antibacterial activity.

Reinforce the strength of PVC by adding glass fiber, study the mechanical properties of PVC on different contents of glass fiber. With the increasing contents of glass fiber, the tensile and bending strength, impact strength are increased, but the breaking elongation is decreased. In order to further improve the toughness of PVC, do research on how to toughen the GF/PVC alloy, study the influence of CPE and ACR on GF/PVC. Use the method of blending modification of glass fiber, PVC and modifiers, significantly increase the impact strength and breaking elongation while maintaining the strength. Compare the influence of CPE and ACR on GF/PVC properties, make excellent strengthened PVC material.

Water and bottom sediment samples were taken from the Zhenjiang section of the lower reach of Yangtze River, China during the autumn of 2011, aimed to study the pollution levels of six kinds of phthalate acid esters (PAEs). Water samples were prepared by solid-phase extraction (SPE) and analyzed by gas chromatography-mass spectrometry (GC–MS), with spiked recoveries ranging from 33.5% to 121.0%. Sediment samples were pretreated using ultrasonic-assisted organic solvent extraction, with recoveries varying from 43.7% to 107.6%. Results showed that the concentration levels of PAEs are below the limit of detection (LOD) –63.3μg/L in the water samples of Yangtze River. Tongji River water are severely contaminated by PAEs, with the concentrations of di-n-butyl phthalate (DnBP) up to 613ug/L. Four of PAEs were detected in the tap water of Zhenjiang. It was also found that all of detected PAEs are dominantly partitioned on suspended solids in water samples. The concentrations of PAEs in sediment samples are ranged from <LOD to 7.5mg/kg.

Anilox is the most important part in flexography, we simplified the structure of anilox roller into an axisymmetric trapezoidal groove, while established a numerical simulation of the ink transfer process by using the finite element method. We had done research on ink transfer characteristics in the flexographic printing process. The ink transfer ratio decreased when the upper plate contact angle increased, while increased when the dovetail groove contact angle increased; the aspect ratio also have impacts on the ink transfer.

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