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High-speed zipper application

A two-axis motion-control package is a key component in a continuous-motion machine that applies reclosable zipper profiles at speeds to 60/min.

On the zipper applicator module a motion controller and two servo drives control both zipper feed and the linear motor that driv
On the zipper applicator module a motion controller and two servo drives control both zipper feed and the linear motor that driv

The 460X from England’s Line Equipment is a continuous-motion zipper applicator module that bolts onto a horizontal flow wrapper or vertical form/fill/seal machine to apply zipper reclosure profiles to packages produced on such machines. A two-axis motion-control system from Baldor plays a key role.

The continuous-motion 460X system is capable of 60 pouches/min, which makes it considerably faster than the intermittent-motion 360X that is also available from Line Equipment. The key to continuous-motion operation is a reciprocating zipper applicator driven by a Baldor linear motor. This zipper applicator strokes forward at the same speed as the flexible film that’s moving through the flow wrapper or vf/f/s machine.

Complementing the linear motor is a Baldor rotary servo motor that feeds zipper material from a roll and into tooling mounted on the reciprocating zipper applicator. When sensors detect a film registration mark, the linear motor is signaled to accelerate forward rapidly until it matches the speed at which the film is being fed. At that moment, the zipper, which has been cut to the appropriate length and vacuum-fed into the zipper applicator tooling, is heat-sealed in place. The instant the seal is complete, the servo-driven reciprocating applicator strokes back to its home position for the next cycle. Cycle time is between 400 and 500 milliseconds.

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