Abstract: A method of manufacturing a printed cardboard product is described. The method includes the steps of manufacturing a single- or double-faced cardboard sheet, and printing a first face of the cardboard sheet not having press marks in a rotary press. An image may be printed on a second face having press marks using an ink jet printer. The rotary printing process may use a fixed image for a production lot, and smaller production lots therefrom printed using the ink jet printer, where the image printed by the ink jet printer may differ from one of the smaller lots to another of the smaller lots. In another aspect, single-faced corrugated cardboard sheets may be produced having an undulating corrugation pattern, and the liner sheet printed using an ink jet process. The printed sheet is formed into a box, where the printed sheet forms the interior of the box.

Abstract: A heat generating agent for medical waste sterilization. The agent is at least one compound selected from calcium oxide, calcined dolomite, and magnesium oxide, and at least one compound selected from sulfamic acid, sodium bisulfate, and anhydrous phosphoric acid. The present invention also provides a method for sterilizing medical wastes. The method includes the steps of subjecting medical waste to exothermic reaction between water and a heat generating agent selected from calcium oxide and calcined dolomite or to exothermic reaction between iron powder and oxygen to generate reaction heat and/or alkalinity by the exothermic reaction. The present invention provides an aparatus to be used according to the method mentioned above.