Ultrasonic injection molding on a web

An injection molding apparatus comprising:

• a first mold member;
• a moving mold member that can move toward and away from the first mold member;
• a mold cavity within the first mold member and facing the moving mold member;
• a web handling means for moving a carrier web between the first mold member and the moving mold member so that part of the carrier web faces the mold cavity and part of the carrier web is outside of the area enclosed by the first and moving mold members when they are in the closed position;
• a means to inject melt into the mold cavity;
• and
• an ultrasonic system for providing ultrasonic vibrations to the melt in the mold cavity;
• characterized by further comprising:
• A. a web indexing means to index the carrier web to a different position along its length each time the moving mold member moves toward the first mold member to close the mold;
• and
• B. an electromagnetic induction heater capable of heating a mold insert within the mold cavity and/or metal surrounding the mold cavity.