Applied Sciences in Graphic Communication and Packaging

Inhaltsverzeichnis

1. Paper and Related Technology

   1. Frontmatter

   2. Analysis and Measurement of the Imbibition Characteristic of Paper Based in the y-Direction

      Guodong Liu, Sijia Fu, Meiyun Zhang, Yue Wang

      Abstract

      The transport of print fluids into the paper including x, y and z-directions is directly dependent on the imbibition characteristic of paper, and some common printing problems, such as print mottle, colour unevenness, and colour bleeding, are considered highly relevant with printing liquid uptake performance of paper. As the measurement of print fluid imbibition into the paper oriented in z-direction is extremely difficult in reality as the paper is too thin to be measured. However, the imbibition along the x and y-directions respectively, is a more practical solution since the wicking amount can be more easily measured. Therefore, in this paper we resort to imbibition measurement along the y-direction of paper to analysis imbibition dynamic of paper, imbibition mechanism oriented to y-direction, and further explore the possibility of replacing the z-direction imbibition of paper using y-direction imbibition. Considered the structural changes for samples, uncoated papers were filled to differing levels of 0, 0.75, 1.25 and 1.5% by weight using the technique of surface filling, to form a transition from the differential equivalent capillary radius. The imbibition characteristics of the paper then were measured with an accurate gravimetric balance system. Considering the classical imbibition dynamics of Lucas-Washburn, inertial and Bosanquet imbibition models for a common porous media, the measured imbibition performance was characterised with square root time (√t) and time (t), respectively. Therefore, the imbibition behaviour of papers was expressed using these two classical timescales and the analysed results are shown that the imbibition performance of uncoated unfilled paper oriented in the y-direction follows neither the classical Lucas-Washburn imbibition nor the Bosanquet imbibition, but associating with the surface wicking occurs rather via a surface film flow along the paper fibres leaving large voids initially empty. However, by adding more filler into paper, the imbibition dynamic can be reverted to Bosanquet imbibition model since the filler load in the surface layer of the paper, the imbibition dynamic is seen to revert to the Bosanquet imbibition model since the filler disrupts the fibre wicking arising from the reduction in permeability and the filling effect into the large voids, thus forming new finer pores by particle packing and aggregation. These findings enable a controlled design of imbibition properties when modifying the pore structure using high surface filled paper.

   3. SiO x /TiO y /C z H t Composite Coatings Prepared by Magnetron Co-sputtering on Substrate Paper

      Zhuang Liu, Lin Zhu, Hanlin Yang, Jiang Chang, Wenping Cao

      Abstract

      SiO _x /TiO _y /C _z H _t composite coatings were deposited on papers by magnetron co-sputtering. Influences of RF power on structures and properties of coatings were investigated. The result from SEM applied to investigate the microstructure showed that coatings could be prepared with good capillary structure as suitable input powers, which helped to get a good printability for papers. Raman test results showed that different input power ratios could be applied to deposit coatings with modifiable inorganic and organic components.

   4. Study on Phthalates Plasticizers Detection of Food Paper Packaging

      Xiaomin Li, Lijiang Huo, Chenyang Liu

      Abstract

      Qualitative and quantitative analysis on phthalate plasticizes (DEHP, DIBP and DBP) of 24 kinds of common food paper packaging were carried out. The study determined the plasticizers using four kinds of organic extraction reagent named n-hexane, ethyl acetate, anhydrous ethanol, and acetone by the Ultrasonic extraction and the gas chromatograph-mass spectrometer technology. The best temperature, time and the way of the extraction of these four different reagent were obtained. Through experiments and analysis, the best extraction reagent of the plasticizers remained in the food paper packaging is ethyl acetate and the best way to extract targets is the combination of ultrasonic oscillation 30 min with vortex 3 min. For the extraction using ethyl acetate, the best temperature of the ultrasonic operation is 25 °C, and the time of the optimum ultrasonic extraction is 90 min. The plasticizers were detected in all of the 24 kinds of food paper packaging samples by the method. The content of DEHP, DBP and DIBP were 0.33497–211.02104, 0.34484–519.9099, 0.20224–37.67883 mg/kg respectively. The result shows that the method is comparatively simple, fast and quantitative accuracy. But the safety of the food paper packaging should be concerned deeply.

   5. Research on Properties of the Edible Chinese Cabbage Paper Packing

      Danting Li, Jiang Chang, Xue Gong

      Abstract

      This paper was based on Chinese cabbage, characterizations were performed to determine the properties of Vegetable fiber. Both Vegetable paper formula and process parameters were studied. It was researched the effect of the additive amount of the starch, binder and plasticizer on the properties of Chinese cabbage paper by the experiment of single factor. By optimizing the test, it was researched and developed of the new vegetable paper. It was obtained the optimum process parameters of making vegetable papers for produce the edible vegetable paper packaging material that had a better performance and suitable to food packaging, and the reliable data for the large-scale production of vegetable papers were provided. It was shown that the new materials can be used in food packaging and even could be directly used as instant food. The use of edible Chinese cabbage packing not only can reduce the environmental pollution, but also can enhance the sense of beauty of the food.

   6. Research on the Preparation and Properties of Water Resistant and Oil Resistant Paper Tableware Made by Bagasse Brown Pulp

      Li Liu, Yichao Lei, Guangxue Chen

      Abstract

      Water-resistant and oil-resistant paper tableware has broad application prospects. The mechanism of water resistance and oil resistance properties of paper and the determination of oil resistance properties were introduced. The water/oil resisted paper was made of bagasse brown pulp by beating and adding oil-resistant agent, water-resistant agent and retention aid. The effects of water repellent, oil repellent and other factors on the oil and water repellency of paper tableware ware studied. The analytical and experimental results showed that the paper preparation using method proposed in this paper has a good performance in oil resistant agent of 2%, water resistant agent of 5%, retention agent of 0.02%, beating revolution of 1200 r respectively.

   7. Effect of Filler on the Hue of Ink-jet Base Paper

      Zhencai Qu, Shiwei Liu

      Abstract

      Filler is an important part of the production of ink-jet paper, adding filler in the pulp can not only improve the hue of ink-jet paper, but also can effectively reduce costs. The effects of pulp ratio, filler type and dosage on the hue of ink-jet paper were studied by adding titanium dioxide, ground calcium carbonate, kaolin and talcum powder. The results showed that when the ratio of softwood kraft pulp to hardwood kraft pulp was 3:7, the titanium dioxide was filled with the amount of 3% (relative to absolute dry pulp), the ink-jet base paper can get a better hue, its L = 94.26, a* Value = +0.25, b* Value = −0.19. The addition of filler in the pulp can significantly improve the hue of ink-jet base paper, which can provide a certain technical guidance for the further production and research in ink-jet paper.

   8. Study on Ink-jet Printability of Surface Coated Rich Mineral Paper

      Yunzhi Chen, Xuehua Ren, Zhengjian Zhang, Yi Sun

      Abstract

      Rich mineral paper has been applied in many fields. The effects of coating using precipitated silica mixed with colloidal silica on the ink-jet printability of the rich mineral paper were investigated as the physical properties and printing performance were taken into comprehensive consideration. The results showed that precipitated silica had better adsorption of ink than colloidal silica and the two composites were better than the single one. When the ratio of pigment to glue was 100:20, precipitated silica was 70 parts, colloidal silica was 30 parts, PVA-1799 was 10 parts, latex was 10 parts and the coating weight was 8 g/m². The color density C, M, Y, K of formula 2 was increased by 83.8, 66.2, 51.9 and 73.7% respectively and the smoothness was improved by 100% compared to the base paper. The smoothness of formula 2 was improved by 232% and color density C, M, Y, K was increased by 44.3, 0.9, 51.9 and 23.4% respectively compared to the color ink-jet paper with base weight of 128 g/m².

   9. Experimental Study on the Ink Jet Printing Quality Improvement of Ordinary Printing Paper with Polyvinyl Alcohol

      Jiang Chang, Xue Gong, Junhao Pang, Yu Wang, Jinyuan Tu, Haoran Wu, Zihui Liu

      Abstract

      At present, the quality of ink-jet printing depends to a great extent on the surface quality of the printing material. The commonly used high gloss paper and coated paper have excellent color rendering results, but the cost is higher, which affects the further application of ink-jet printing. Therefore, the low cost ordinary printing paper is used as the base paper, and the surface of the base paper is coated with polyvinyl alcohol solution to improve the surface quality of the base paper. Preparation of test specimens for color strength condition of different coating solution concentration and coating were tested and compared with the base paper, color intensity was the standard color is obviously improved; printing characteristic curve of the samples were tested and analyzed, compared the change trend of density in the actual printing process of the various. It is found that the printing quality can be improved obviously by adopting the above process.