Displacements on a cross-section of a heat-sealed area in laminated plastic film used for liquid package bags are measured by a digital image correlation. All the specimens used for obtaining the images necessary to measure the displacements are cut into the required shape from heat-sealed package bags. The images are recorded by an 8mm video camera via a microscope, and digitized by an image-processing device. Twenty-six images are used for obtaining the displacements between the no-load condition and failure of the specimens. As a result, a characteristic displacement is found in the heat-sealed area.
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