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Linear servo motors power vf/f/s bagger

From ‘zipper crush’ to the actuation of a tear-notch-cutting assembly, these linear servo motors are just the ticket. They also minimize up-front cost as well as ongoing energy consumption.

This continuous-motion vf/f/s machine relies on the 48x240 linear servo motor (shown) for the up and down movement of the zipper crush assembly.
This continuous-motion vf/f/s machine relies on the 48x240 linear servo motor (shown) for the up and down movement of the zipper crush assembly.

The continuous-motion XYRJ vertical form/fill/seal machine from Triangle Package Machinery has a rotatable sealing jaw that helps users run a variety of bag styles—three-side-seal, pillow, bottom-gusseted—for products including cereal, cheese, coffee, crackers, produce, meat, poultry, and seafood. Among the options available is application of a longitudinal zipper reclosure feature, and when this capability is integrated into the machine, two linear servo motors from LinMot play key roles.

The first of these linear servo functions has to do with the ultrasonic zipper crush. To visualize what this is, picture a conventional zip lock bag. Immediately noticeable is that the zipper material is crushed at the left and right sides of the bag. This ensures that the zipper opens readily across the middle of the bag but remains securely closed at opposite ends.

On the continuous-motion XYRJ, which has a rated speed of 70 to 80 bags/min when zippers are being applied, the ultrasonic zipper crush assembly closes on the film, performs its zipper crushing function while moving with the zipper, and then opens and strokes back up to begin its next cycle. This up and down motion of the zipper crush assembly is driven by a LinMot 48x240 linear servo motor. According to Senior Mechanical Project Engineer Mike Wolf at Triangle, this motor was chosen for its high precision and sanitary design and because it has few wear parts.

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