Now approaching its 25th anniversary, J&J Snack Foods has posted 24 consecutive years of sales increases. Soft pretzels are its specialty, both for foodservice and retail channels. The Pennsauken, NJ, firm's Superpretzel line is the number one brand of soft pretzels in the supermarket trade. Sustaining this growth naturally requires constant evaluation of and upgrades in packaging systems. One good example of such an upgrade is in the freezer warehouse at the firm's Vernon, CA, plant. There J&J has installed an automated stretch wrapper from Wulftec (Ayer's Cliff, Quebec, Canada) that frees up several workers from the onerous task of using hand-held rolls of wrap to stabilize pallet loads. Even more important, the automated system delivers a uniformity of stretch and a consistency in pallet appearance that couldn't be achieved with hand wrapping. The firm might have automated its pallet wrapping sooner, but it had difficulty finding a machinery manufacturer that would guarantee its equipment would operate reliably in temperatures that average Enter Wulftec and its west coast distributor, Gulf Pacific Packaging (Vernon, CA). "Wulftec came to our attention through its western distributor," recalls John Carmichael, chief engineer at J&J's Vernon plant. "They were willing to guarantee their equipment would do certain things for us, and it has." It couldn't do those things, however, until Wulftec engineers added electric heating elements to motors and gears. The electrical controls are heated, too. The programmable logic controller in particular, a SLC 500 from Allen-Bradley (Milwaukee, WI), must be kept at least 45°F to function properly. These modifications were all taken care of by Wulftec before the Model WCRT-200 rotary tower machine was shipped. But once the wrapper was in its new environment, another problem had to be thawed out. Much of the machine's actions are pneumatically driven. This requires air lines, of course, and J&J quickly discovered that condensation gradually builds in those lines and freezes to block the flow of needed air. That meant more heating elements had to be added, beginning with the central air regulator from which pneumatic lines branch off in various directions. In addition, insulated electrical heating strips encase all pneumatic lines. Controlling all of this is a thermocoupling unit similar to the thermostat used for a home furnace. With it, J&J can control the temperature of all pneumatic lines to keep air moving smoothly.
A well 'thawed-out' solution
J&J Snacks needed to automate pallet wrapping in its freezer warehouse. But only a specially insulated wrapper could function at temperatures as low as
Feb 28, 1997
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