S-D21 Automatic Twist-Off Cap Pre-Curler is designed for the cap fringe inward tiny curl. Cap shells, made by press, are lifted up by an elevator and guided to enter the machine via a chute. Six sets of inner curling rollers enter cap inside and carry caps travel along an arc outer curling mold to slightly curl the cap fringe inward. Curled caps are carried out one by one by a magnetic wheel and guided by a chute to enter knurl forming and lining machine S-D21. Simple structure and multiple safety devices, easy for operation and maintenance.
