Papers by Keyword: Packaging Materials

Abstract: The following article represents the research on the elaboration of biodegradable films for environmentally friendly packaging based on polyvinyl alcohol, corn starch, glycerin, and borax. Growing consumption of packaging results in greater waste; the biggest part of which comprises problematic plastic packaging that is difficult and expensive to recycle. The majority of biodegradable packaging materials have insufficient technological characteristics. It is due to that the development of composite compositions based on inexpensive raw materials is a necessary condition to extend the range of high-quality safe packaging capable of minimizing environmental impact. The objective of the study is to obtain film materials based on polyvinyl alcohol, corn starch, and glycerin with the addition of sodium tetraborate and to study its mechanical and surface properties. The compositions for the film samples are prepared by an aqueous solution of Polyviol 6 04/140 polyvinyl alcohol to which water-soluble corn starch is added. The mixture is gelatinized, cooled, and glycerin and borax are added under stirring. Films are obtained by casting onto a glass substrate. The films obtained are almost transparent to the sight, soft and flexible by touch, showing good stretchability. The values of tensile strength for the films containing polyvinyl alcohol-starch, as measured by a dynamometer on a universal testing machine, are 1.5-1.7 times higher than that of samples without starch. The values for elongation at break of the films tested fall between 280 and 425%. Surface property testing of the obtained films is performed with an instrument for the determination of the wetting contact angle. Distilled water and ethylene glycol are used as test liquids for wetting. Wetting kinetics analysis of the films by water and ethylene glycol shows the possibility to make high-quality marking with necessary consumer information on them. Biodegradable films with a polyvinyl alcohol-starch mass ratio of 5:2 exhibit the best mechanical and surface properties. From a performance point of view, PVA, starch, and borax-containing films could be used as biodegradable packaging.

Abstract: Logistics industry becomes the mainstream with promotion of life quality. The selection of delivery type and aging is subjected to limitations of packaging materials. In order to protect from product’s damage, this study purposes to use recycled high-strength fibers, including high-strength PET fiber, and Kevlar fibers, and thermal bonding PET fiber as well as glass fabric forming needle-punched 3D composite. For comparison of varying reinforcement on mechanical property, thermal bonding and water polyurethane impregnation are used to reinforce the 3D composite which is composed of nonwoven fabrics and glass fabrics. Result shows that, mechanical property from water polyurethane impregnation displayed much higher than that from thermal bonding. Thermal bonding remarkably improved burst strength and static puncture resistance. Therefore, 3D composite impregnated with water polyurethane reaches higher puncture protection level.

Abstract: In recent years, the rapid development of the national economy has leaded to a variety of social and environmental problems, among which the waste of resources and environmental pollution caused by food packaging can’t be ignored. Basing on the existing food packaging problems in Chinese market and the consumers’ attitudes and ideas, this paper will explore the food packaging designs methods upon the green concept, and analyze their future development trends.

Abstract: Phosphor and silicone are common used packaging materials in LED fabrication and have great influence on the reliability of LED modules. In order to understand the effect of these materials, test LED samples were prepared with different sets of packaging materials. An aging test at a constant temperature of 125°C was performed to discover the failure process. The results of aging test shown that the luminance of all samples fell obviously. But the luminance decrease of samples without phosphor and silicone was the least. As to other samples, the carbonization of silicone and the consequent bubbles reduced the luminance rapidly. And the phosphor had the similar influence on the luminance. If phosphor and silicone were used at the same time, the luminance would reduce quickly and then the modules would fail.

Abstract: By analysis of manufacturing performance of corn stalk, and taking practical processing technics of particle board in consideration, this paper set strawboard density, adhesive consumption, hot-pressing temperature and hot-pressing pressure as variable factors, set prepressing pressure, prepressing time, shaving shape and moisture content of raw material as fixed factors, exploring the optimal combination of process parameters through orthogonal experiments.

Abstract: Miniaturisation of electronic chips which have increasing functionality within the same package size has induced significant increases in requirements for extraction of heat from the integrated circuit (IC). Packaging materials therefore have to be capable to conduct heat efficiently and at the same time have low coefficient of thermal expansion (CTE) to minimize the thermal stress and warping. In the present study, copper silicon carbide was selected with an aim to solve thermal management problem presented by current IC systems. Powder metallurgy routes were chosen to fabricate the MMC based on this materials system. Copper and silicon carbide powders were mixed together in a planetary ball mill, and the green articles were then compacted and sintered to produce the final product of CuSiC. The sintering parameters were investigated for their effects towards the thermal conductivity of the composite. Sintering parameters investigated included temperature, heating duration and the gaseous environment. Upon sintering, the CuSiC particle bond to one another giving a higher strength and a possibility in attaining desirable density. Thus to achieve good thermal conductivity, the recommended sintering parameter suggests that the CuSiC composite should be sintered at 950°C for 7 hours in nitrogen gas.

Abstract: Grape juice drinks processed from Muscat grapes as raw material was filled in glass bottle, PP plastic bottle and PE plastic bottle respectively after high temperature sterilizing. Original grape juice acted as control, and then all kinds of nutrients, color and aromatic substances were determined to evaluate the effect of different packaging materials on grape drink quality. The results showed that the content of total acid, reducing sugar and soluble solids of three packaging samples were decreased to some extent, and the color changed significantly. To be more specific, PP plastic packaging samples had the greatest nutrients loss and the most obvious color change. The sample packaging with glass had the most aroma types, the best preservation of the linalool and the maximum content of Terpenoids Chemicals compared to the other two packaging materials. Altogether, the glass was the best package materials compared with the other two materials.

Abstract: In recent years, with the requirements of environmental protection of packaging materials improve, biodegradable materials more and more attention to. This paper to waste as raw materials, and by the synthesis of the biodegradable packaging material performance for research. The results show that: to recycle waste as raw material, add natural renewable material alkali lignin and cellulose, and influence factors of sheet material performance, get the film material performance is the ideal process parameters. According to People's Republic of China national standard GB/T6342-92 "plastic compression performance test method" and GB/T20197-2006 "degradable plastics the definition, classification, signs and degrade the performance requirements," as determined by the experimental method for testing. The orthogonal experiment results show that waste polyurethane: alkali lignin: cellulose = 3:4:6 made materials when mechanical properties and degradation is better. Compressive strength for 340 KPa, biodegradable sex for 40.1%, have reached national standards.

Abstract: With the gradual increase of the global environmental awareness and environmentally friendly voice rising, the deal with the problem of plastic waste has become the focus of public opinion around the world has also become a hot topic of scientific research. This paper can be made of polystyrene as main raw material, adding starch and antibacterial agents containing silver nanoscale titanium dioxide, and by the synthesis of biodegradable packaging materials performance. The results showed that: 0.25mm sheet of polystyrene made of the thickness of the main raw material by injection molding process, and factors affecting the performance of the sheet, the better the performance of the film material process parameters. According to the definition of the GB/T1040-92 national standards of the People's Republic of China "plastic tensile properties of test methods and GB/T20197-2006 degradable plastics, classification, marking, and degradation of the performance requirements" and GB4789.3-94 "State Microbiological examination of coli form bacteria in the standard of food hygiene as determined by experimental methods for testing. The orthogonal experiment results show that the expandable polystyrene Dosage: 80%; starch dosage: 2%; toluene, acetone and put ratio: 3:2 .The mechanics of materials, degradation, and antimicrobial properties.

Abstract: The demand for advanced thermal management materials such as silicon carbide reinforced copper matrix (Cu-SiC_p) composites is increasing due to their high thermal conductivity and low CTE properties. However, the weak bonding between the copper matrix and the SiC_p reinforcement degrades the thermophysical properties of the composites. In order to improve the bonding between the two constituents, the SiC_p were copper coated (Cu-Coated) via electroless coating process. Based on the experimental results, the CTE values of the Cu-Coated Cu-SiC_p composites were found significantly lower than those of the non-Coated Cu-SiC_p composites. The CTEs of the Cu-Coated Cu-SiC_p composites were in agreement with Kernels model which accounts for both the shear and isostatic stresses developed in the component phases.