Method of startup procedure of strip in the twin roll strip casting process

A method for drawing a strip initially cast by means of a twin roll strip casting apparatus, comprising:

• a roll gap maintenance step where roll gap is maintained so that a leader strip having a length l0 disposed above a roll nip does not fall between rolls;
• a casting initiation step where a stopper is disengaged from a tundish hole of a tundish so that molten metal is poured into a space between the rolls, and the rolls are rotated at the same speed as an initial starting speed v0 of each of the rolls if the position of the stopper is higher than the actually poured position of the molten metal (rod_offset);
• a casting speed acceleration step where a roll repulsive force (rolling force) is detected when the molten metal is solidified to the leader strip and passes between the rolls, and the casting speed is accelerated if the roll repulsive force reaches a load threshold;
• and
• a normal control step where the casting speed is detected, and if the casting speed reaches a target value, i.e., a normal casting speed, the casting speed is maintained at the normal casting speed.