Abstract
In this study, by using a cover without thickness, as maximum capacity, a tip-resistant trash box even if load forces act at the end was proposed. The thickness that maximizes capacity of the formed trash box was found, and the maximum capacity of the formed trash box was found from the found thickness. The maximum capacity was large in case that width is larger than height in the cover, a flap was on left and right in long and rectangular formats, and a flap was on up and bottom in western formats. The trash box became harder to fall down, because fall load forces in the length and thickness directions were large in case that the width is larger than the height in the cover. Therefore, by using the cover that the width is larger than the height, as the maximum capacity, the cover was the tip-resistant trash box even if the large load forces act.