Composite insulator-packing container and a method for packing a composite insulator

A method of packing an insulator inside corrugated fiberboard, said method comprising:

• (1) preparing a single-faced corrugated fiberboard composed of a linerboard and a corrugating medium joined to one surface of said linerboard;
• (2) forming ruled lines such that said ruled lines are parallel to one another and substantially orthogonal to flutes of the corrugating medium such that when said fiberboard is folded along said ruled lines in a form of a polygonal prism, outer peripheries of shade portions of an insulator formed around a core member internally touch or are located radially inwardly near inner peripheral sides of the polygonal prism;
• (3) placing an insulator on the single-faced fiberboard on a side which is to be located inside a packing container;
• and
• (4) folding said fiberboard in the form of the polygonal prism along said ruled lines such that the linerboard is located at an outer periphery of said packing container.