PROBLEM TO BE SOLVED: To accurately detect a risk of a corrugation crack of a core without being influenced by the kind of a corrugating roll and the core by measuring the ratio of a supply time to a supply length of the corrugated core, and determining that the ratio has reached a limit ratio.;SOLUTION: A liner supply speed VL and a core supply speed VN are measured (S4), and a present corrugation rate Rx is computed based on both supply speeds VL, VN (S5). When determining that the corrugation rate Rx is reduced to a limit corrugation rate Rm or less (S6: Yes), an air cylinder 68 is operated (S9). During the operation of the air cylinder 68, a touch roll 66 moves into a contact position in contact with a core preheater roll 621 and holds the core 40. The core 40 is surely given conveying power from the preheater roll 621 and supplied. When the whole core roll 41a is consumed, the air cylinder 68 is made inoperative, and the touch roll 66 returns into a spaced position from the contact position.;COPYRIGHT: (C)2010,JPO&INPIT
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