Problem: usually, when cardboard is sent by home delivery, the corrugated cardboard box is used, but it is rare that the volume of the contents and the box coincide with each other, and usually, the space is generated in the box, so that it is usual to reduce the volume of the box to prevent ginkgo.At that time, a plate shaped one is used or a dedicated tool is often used.The former is inefficient, and it is not easy to finish.In addition, the latter requires a lot of knack, and when unskilled people perform it, the finish is not good.Since the size of the tool is large, a large storage space is required.Solution: a disc-shaped roller having a sharp edge or serrated edge, a disc-shaped roller having a peripheral edge having a constant thickness opposed to it, or a receiving surface made of a material having a small coefficient of friction, sandwiched between sides of the cardboard box The corrugated cardboard box was able to be finely improved without the skill by forming the folding line inside the side of the cardboard box.Diagram
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