Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes

Zhuhai, China

Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes

Zhuhai, China
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Wang Z.,University of Jinan | Wang Z.,Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes | Peng C.,University of Jinan | Peng C.,Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes
Yingyong Lixue Xuebao/Chinese Journal of Applied Mechanics | Year: 2013

The impact of molded pulp products is investigated by using the INSTRON 9250HV impact experiment system and finite element method, and the impact compression process, load carrying capacity and energy absorbing characters are obtained for molded pulp products under different humidity conditions. The elastic modulus and yield strengths of the molded pulp materials decrease remarkably with the increasing of the relative humidity, for example, under the 90% humidity condition they are 44.5% and 37.6% respectively to those under the 50% humidity condition. The impact load-deformation curves and energy absorbing curves of the molded pulp trays are obtained by using the finite element method under the different humidity are consistent with those by the experimental tests. The impact load carrying capacity and energy absorbing of molded pulp products decrease remarkably with the increasing of the relative humidity, and the first and second buckling loads under the 90% humidity condition are respectively 44.8% and 47.9% to those under the 50% humidity condition. For the two layer structure, the impact response of the molded pulp tray exhibits the two buckling processes phenomena. The first buckling is corresponding to the collapse of the underlayer supporting, and the second buckling is corresponding to the collapse of the uplayer supporting. The impact collapse of the underlayer supporting should be taken as the safety design limit in the design of the molded pulp trays, and the nominal stress and energy absorbing of the collapse of the underlayer supporting form the best point of energy absorbing (the limit of energy absorbing) for practical design.


Chen Y.-F.,Jinan University | Zhong H.-N.,Guangdong Inspection and Quarantine Technology Center | Yi R.,Guangdong Inspection and Quarantine Technology Center | Wang Z.-Y.,Guangdong Inspection and Quarantine Technology Center | And 3 more authors.
Modern Food Science and Technology | Year: 2015

The migration behavior of epoxidized soybean oil (ESBO) from polyvinyl chloride (PVC) gaskets in the lids of glass jars into food simulants such as 3% acetic acid, 50% ethanol, or olive oil was studied at 25℃, 40℃, and commercial sterilization conditions (121℃ and 0.1 MPa). The results showed that the migration level of ESBO increased with increasing temperature and time of contact. At migration equilibrium, ESBO migration rates in 3% acetic acid, 50% ethanol, olive oil, and olive oil after sterilization observed were 0.06%, 0.46%, 30.36%, and 31.35% at 25℃, respectively. In contrast, they were 0.14%, 1.40%, 31.57%, and 33.87% at 40℃, respectively. The maximum migration rate of ESBO was found in olive oil, followed by 50% ethanol. Since the dissolution rate of ESBO in 3% acetic acid was the lowest, almost no migration occurred. The amount of ESBO in olive oil at migration equilibrium exceeded the overall migration limit in Regulation (EU) No 10/2011. Thus, high-pressure high-temperature sterilization played a certain promoting effect on the migration of ESBO in oil. ©, 2015, South China University of Technology. All right reserved.


Wang J.,Key Laboratory of Disaster Forecast and Control in Engineering | Wang J.,Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes | Lv X.,Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes | Huang S.,Key Laboratory of Disaster Forecast and Control in Engineering | And 3 more authors.
Applied Mechanics and Materials | Year: 2012

A new mathematical method is developed for the calculation of equivalent elastic modulus of UV-type corrugated paperboard. The model is assumed to be composite sandwich structure and to endure the out-of-plane uniform pressure. Force method is used for the derivation of the formula. The influence of the corrugated medium structure on the flat compression strength of corrugated paperboard is investigated as well. The equivalent elastic moduluses of two different sizes of three-layer UV corrugated paperboard are calculated according to the derived formula. The relationship between the thickness and the shape parameters with the flat compressive strength is discussed. The introduction of shape coefficient into this formula can help to optimize the corrugated sandwich structure and its cushioning pads. © (2012) Trans Tech Publications, Switzerland.

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