Heating patterns depending on the packaging materials were examined in order to investigate the causes of thermal deformation of packages used for ready-to-eat foods for microwave heating due to the non-uniformity of microwaves. Physical properties including tensile strength, heat-resistance and elongation of four different CPP grades were compared. High retortable CPP had higher sealing strength and heat resistance compared to the conventional CPPs. All CPP samples tested were proved to have melting temperatures around 160oC. However, they were all thermally deformed by microwave heating due to a limited penetration of microwave and non-uniform heating within the spicy sauce of high viscosity contained high salt, especially on the above the filling line and sealing edge of pouches. When the laminated stand-up pouches composed of G-PET/PET/PET/CPP and G-PET/PET/NY/CPP were retorted and microwaved, significant deformations were noticed in both samples after retorting. Besides, pouches contained titanium dioxide showed more intense thermal deformation than the control. When the 10 μm aluminium foil was affixed on the pouch, small thermal deformation was observed only in the bottom layer. More studies are required to prevent the thermal deformation of packaging materials used for RTE foods during microwave heating by developing the technologies to increase the thermal stability of CPP layer and the modification of packaging design to modify the microwave access into the package.
목차
Abstract 서론 재료 및 방법 1. 재료 2. 실험 방법 결과 및 고찰 1. CPP 재질별 내열성 비교 2. 합지 포장재 종류에 따른 열 변형과 합지 강도 변화 3. 이산화티타늄 첨가 유무에 따른 파우치의 전자레인지 가열조리 패턴 분석 4. 알루미늄 접합 또는 내면 PET층 파우치의 전자레인지 가열조리 패턴 분석 요약 감사의 글 참고문헌