Applied Sciences in Graphic Communication and Packaging

Inhaltsverzeichnis

1. Film and Related Material Technology

   1. Frontmatter

   2. Structure-Colored Polymer Film Fabricated by Surface Immobilizing Amorphous Photonic Crystals

      Yanan Liu, Yaping Yan, Jinmei Zhu, Shengliu Wang, Yun Ouyang, Lianying Liu

      Abstract

      Amorphous photonic crystals display isotropic photonic band gaps and angle-independent non-iridescent, structural color, which leads to increasing interest and promising applications in image display, laser light, environment-friendly ink/coating, etc. However, previous amorphous photonic crystals usually exhibit low strength, and their structure is easily destroyed. Thus, their unique optical properties cannot be fully exhibited. Herein, amorphous photonic crystals of core (polystyrene-PSt) and shell (poly (4-methacryloyloxybenzophenone)-PMABP) structured microspheres are formed. Using polymer films (PET, PP, PMMA and PE) coated with poly (4-(methacryloxy) benzophenone-co-N-Isopropyl acrylamide) as substrates, the amorphous photonic crystals are immobilized under UV-irradiation. Adding cross-linker of ethoxylated trimethylolpropane triacrylate (ETPTA) in microsphere dispersion, transparent and flexible free-standing films of photonic crystals are fabricated. Angle-independent structural colors are observed and tuned by varying microsphere concentration in dispersions and content of cross-linker.

   3. Effect of Antimicrobial Packaging Film Coated with Ajowan and Cinnamon Essential Oil on Shelf Life of Fresh Chilled Pork

      Wei Huang, Jianqing Wang, Haiyan Song, Qian Zhang, Guangfa Liu

      Abstract

      This work was aimed to explore the effect of antimicrobial packaging film coated with ajowan and cinnamon essential oil (EO) on shelf life of fresh chilled pork. Antimicrobial compound solution was prepared with ajowan EO, cinnamon EO, polyvinyl alcohol, glycerol, corn starch and distilled water according to a certain proportion, and it was coated on the corona-treated PP/EVA film to prepare antimicrobial films. The fresh pork was divided into 5 groups and packaged in bags which was made of films as follow, the blank PP/EVA film was used as the control group, and the antimicrobial films contain combination EO with concentration of 0.4, 0.8, 1.2 and 1.6% were recorded as BF1, BF2, BF3 and BF4 group respectively, and all groups were stored at 4 ℃. The total viable count (TVC), total volatile basic nitrogen (TVB-N), pH, TBARS value and sensory quality of pork were tested for evaluating the effect of antimicrobial packaging film on quality of pork. The results showed that BF4 antimicrobial film could reduce the increase of TVC, TVB-N, pH and TBARS value of pork significantly (P < 0.05), and the BF4 film was superior to other kinds of antimicrobial film on maintaining the sensory quality of fresh pork. In conclusion, the fresh chilled pork packed in BF4 film presented the best quality and its shelf life was extended for 4 days.

   4. Study of the Influence of Preparation Conditions of γ-PGA Ester as a Food Packaging Material on the Biodegradation Performance

      Wei Xiao, Zhihui Sun, Jia Liu, Jing Dong

      Abstract

      As people enhance consciousness on food safety and environmental protection, the research of food packaging materials has been widely noted. Non-degradable disposable food packaging plastics as the most common food packaging materials have some disadvantage such as harmful substances migration, air pollution and waste of land resources. γ-PGA ester is a new kind of food packaging materials which attracted the attention of the researchers due to its non-toxic and biodegradable. This study analyzed the influence of preparation conditions of γ-PGA ester as a food packaging material on the biodegradation performance through the orthogonal experiment methods which provide references for the related researchers.

   5. Development of New Plastic Packaging Film for Food Packaging

      Hui Liu, Wencai Xu, Dongli Li

      Abstract

      In view of the problems existing in the field of food packaging safety in China, this paper introduces the research progress of new plastic packaging films for food packaging in recent years. The research results have important practical significance for promoting the function of food packaging and the effective application of new plastic flexible packaging film in the whole process of food production, circulation and consumption in china.

   6. Preparation and Characterization of Salicylic Acid/Polylactic Acid Composite Packaging Materials

      Xing Yin, Cheng Sun, Mingyue Tian, Yuan Wang

      Abstract

      Salicylic acid (SA) is widely used in postharvest storage of fruits and vegetables. It was added to the polylactic acid (PLA) film. And then the antibacterial rate, mechanical properties, moisture permeability of the composite packaging materials were tested. The crystallization properties and morphology were measured by X-ray diffraction and scanning electron microscopy. The results showed that when the mass fraction of SA was 6%, the antibacterial rate against Escherichia coli reached to 97.63%, the water vapor permeability coefficient was 11.4 × 10⁻¹⁴ g cm/(cm² s Pa). With the mass fraction of SA increased, the tensile strength decreased, the breaking elongation increased obviously. The comprehensive performance of the composite packaging material was improved.

   7. Study on Packaging Properties of Biomass Materials Made by Bagasse Pith

      Zhiyu Ma, Yanna Lv

      Abstract

      The thermoplastic starch (TPS)-based biomass packaging materials with different amounts of bagasse pith (BP) (0, 5, 10, 15, 20 and 25% relative to oven dry starch) were prepared by melting blend methods, and the effects of BP contents on the packaging properties were investigated. Results of Fourier Transform Infrared (FTIR) illustrated that the intermolecular hydrogen bondings forms in BP and TPS. TPS could restrain starch retro gradation with increasing BP content. The tensile strength, flexural strength and flexural modulus increased with increasing BP content, while elastic modulus increased first and then decreased, and the maximum value was achieved by TPS/BP with 20 wt% BP content. The different effects on water absorption of TPS/BP were observed at 43 and 100% RH. The surface morphology of tensile fracture and flexural fracture analyzed by scanning electron microscopy (SEM) revealed strong facial interactions in BP and TPS with increasing BP content.

   8. Large-Scale Fabrication of Ordered Monolayer Self-assembly of Polystyrene Submicron Spheres

      Xiuyan Li, Zhe Li, Fenlan Xu, Yan Yan, Wei Wang, Luhai Li, Ruping Liu, Zhou Li

      Abstract

      Fabrication of ordered array and its applications have emerged as a critical tool for micro-structure, with which generally apply in sensing, wastewater detecting, and field emission. This review focuses on the fabrication of ordered patterned array polystyrene (PS) submicron particles monolayer as well as its effect factors. Substantial progress in the two dimensional (2D) regular patterned array has made by developing variety of method. One effective method of fabricating PS submicron spheres with full regular patterned, aligned monolayer ordered array is discussed in this paper and SEM was used to characterize the performance of the monolayer. This approach opens the simplicity and convenience of creating patterned two-dimensional nanostructure. Its greatest advantage is that suitable for large particle size spheres, Finally, the development tendency and prospect of in theses research areas are outlined.

   9. Effect of Different Heat Treatment Methods on the Morphology and Electrical Conductivity of Ag Nanoparticle Films

      Zhenguo Wang, Fenlan Xu, Qichao Hou, Wei Yang, Woye Zhang, Lixin Mo, Luhai Li

      Abstract

      In order to study the effect of different heat treatment methods on the morphology and electrical conductivity of Ag nanoparticle films, the morphology and conductivity evolution of the conductive films during the heat-treatment process in an oven and on a hot plate are investigated. We found that the films heat-treated on an oven had big differences between the surface microstructural and the cross section microstructural. When the interior of the silver nanoparticle film has been significantly melted, the surface particles have not yet begun to melt. It was discovered that the surface Ag NPs of the films are lower the temperature began to melt heat-treated on a hot plate than heat-treated in an oven and the films heat-treated on the hot plate can reduce the post-treatment temperature compared with the heat treatment in the oven. Because the thermal conductivity of steel and glass is much greater than that of air, and the temperature of the films rises sharply heat-treated on the hot plate, contributing to the sintering of the Ag nanoparticle films.

   10. Effects of Several Surfactants on Surface Tension of PVA Hot-Melt Adhesive Tape

       Xinting Wang, Guorong Cao, Dongli Li, Meiqi Yang

       Abstract

       Most of current packaging tape are made of non-degradable BOPP film, subsequently rendering carton recycled lose commercial value and causing a great hazard on the living environment. PVA film is known as a type of environmentally friendly material because of its excellent characteristics, e.g. water solubility and degradability. Since PVA film has strong polarity, it is necessary to coat surfactants to reduce the surface tension. In the paper, Span20, Span60, Span80 and Tween60 were coated on the other side of PVA hot-melt adhesive tape by hand. The surface tension was measured under different placement time. It measured the 180° peel strength of PVA hot-melt adhesive tape coated with surfactants in comparison to PVA hot-melt adhesive tape without surfactants and BOPP tape so that appropriate surfactants were chosen. The results show that the surfactants can reduce surface tension of the other side of PVA hot-melt adhesive tape. However, only the mass ratio of Span60 and C₂H₆O is between 1:5 and 1:10, the 180° peel strength of PVA hot-melt adhesive tape is the best. PVA hot-melt adhesive tape with other surfactants is stuck together when the tape is crimped or its peel strength is too small.