SLIDER-OPERATED FASTENER WITH SPACED NOTCHES AND ASSOCIATED PRESEALS

摘要

A slider-operated fastener (10) comprises first and second opposing tracks (12, 14) including respective first and second interlocking profiles (16, 18) and respective first and second fins (20, 22) extending downward from the respective first and second profiles (16, 18). The first and second fins (20, 22) are sealed to each other by a plurality of spaced preseals (28). After generating each preseal (28), a notch (38) is formed in the profiles and upper portions of the fins (20, 22) at the generated preseal (28). To install a slider (40) is initially positioned within the respective notch (38) and then threaded onto the fastener (10) in response to relative movement of the slider (40) and the fastener. Either before or after the steps of forming each preseal (28) and respective notch (38) and installing the respective slider (40), the fastener (10) is attached to a moving web (50) of plastic film (52). The fastener-carrying web (50) is later folded and sealed to form individual plastic bags (80).