Abstract: A double facer that fabricates a corrugated fiberboard and that includes heat plate units having thin walls aims at improving the heat conductive efficiency to fiberboard sheets in order to enhance responsibility to the setting temperature and concurrently avoiding thermal deformation of the heat plates due to a difference in temperature between the top surface and the bottom surface.

Abstract: In a rotary printing press that includes a blanket cylinder and a plate cylinder, the plate cylinder includes a plate cylinder body, a plate that is rolled around the plate cylinder body, and a plate insertion groove that is formed on a circumferential surface of the plate cylinder body along the axial direction thereof, and the blanket cylinder includes a blanket cylinder body, a blanket that is rolled around the blanket cylinder body, and a blanket insertion groove that is formed on a circumferential surface of the blanket cylinder body along an axial direction thereof. A groove opening width of the plate insertion groove and a groove opening width of the blanket insertion groove are reduced in a boundless manner.