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Tuesday, March 16, 2010: 10:30 AM
214 C (Henry B. Gonzales Convention Center)
In food can industry, lacquered tinplate can is commonly used for packing food, vegetable and fruit. The lacquer plays an important role as a coating on metal to protect the chemical reaction between metal can and the food while still preserving the appearance and taste of the food. In addition, this lacquer must comply with customer’s satisfaction and international safety standard.
The lacquer coated inside the food can is typically deteriorated as time passed by. Deterioration rate depends on type of food inside the can since there is some liquid solution which is the major cause of deterioration of the lacquer. Therefore, if one keeps the food can at elevated temperature or for a long period, it will accelerate this rate. Thus, testing to investigate the shelf life of the food can at various temperatures is essential in order to predict the quality of lacquered coated on the can.
EIS is a popular electrochemical technique for studying properties of polymer coated on the metal i.e. lacquer coated on food can and paint on metal. This is a non-destructive testing method by using AC current in which its frequency and voltage can be changed. This AC current is applied to coated samples to find properties of coating from the response signals.
In this research work, the electrochemical technique, specifically, Electrochemical Impedance Spectroscopy (EIS) is utilized for investigating properties of lacquer on sweet-corn can which kept at three different temperatures and tested every week for 8 weeks. As the results, the resistance of the lacquer and the trend of deterioration the lacquer coating were obtained. Consequently, the shelf life at specified temperatures along with Q15 for sweet-corn can is predicted by applying the Arrhenius equation and subsequently come up with the quality of the lacquer.
The results from this investigation are useful in various ways such as the guideline for selecting the type of lacquer that suitable with forming processes and food inside the can, the thickness of the coating, the number of lacquer layers and the development lacquer’s properties.
The lacquer coated inside the food can is typically deteriorated as time passed by. Deterioration rate depends on type of food inside the can since there is some liquid solution which is the major cause of deterioration of the lacquer. Therefore, if one keeps the food can at elevated temperature or for a long period, it will accelerate this rate. Thus, testing to investigate the shelf life of the food can at various temperatures is essential in order to predict the quality of lacquered coated on the can.
EIS is a popular electrochemical technique for studying properties of polymer coated on the metal i.e. lacquer coated on food can and paint on metal. This is a non-destructive testing method by using AC current in which its frequency and voltage can be changed. This AC current is applied to coated samples to find properties of coating from the response signals.
In this research work, the electrochemical technique, specifically, Electrochemical Impedance Spectroscopy (EIS) is utilized for investigating properties of lacquer on sweet-corn can which kept at three different temperatures and tested every week for 8 weeks. As the results, the resistance of the lacquer and the trend of deterioration the lacquer coating were obtained. Consequently, the shelf life at specified temperatures along with Q15 for sweet-corn can is predicted by applying the Arrhenius equation and subsequently come up with the quality of the lacquer.
The results from this investigation are useful in various ways such as the guideline for selecting the type of lacquer that suitable with forming processes and food inside the can, the thickness of the coating, the number of lacquer layers and the development lacquer’s properties.