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Article | July 31, 1997
The competition The packaging against which Genpak's tray is being measured is a paperboard box and two EPS foam cups that hold side dishes. The cups are sealed with lids of oriented polystyrene. According to KFC's Glenn White the key question behind the test is whether customers prefer the new package to the old. But there are equipment and personnel issues that must be analyzed as well Package cost White adds is about the same for the new pack as it is for the old. And which gets the best marks from an environmental standpoint? "One advantage of the tray and lid" says White "is that it uses only two materials while the box and cups incorporate a total of four: SBS [solid bleached sulfate] grease-resistant sheet insert EPS foam and OPS lids for the cups."
KFC tests new meal plate
An ongoing test at select Kentucky Fried Chicken outlets will soon determine if a plated meal package for single servings should be adopted throughout the Louisville, KY-based KFC chain.
But even before the results of the test are in the package has its share of admirers. It won a Worldstar for Packaging award in the Retail-Foodservice category from the World Packaging Organisation. Produced by Genpak (Glens Falls NY) the KFC award winner is a tray/lid combination whose design patent is jointly shared by KFC and Genpak. The tray is a two-layer structure that Genpak makes by first extruding expanded polystyrene foam. Then in the same pass a 2-mil layer of high-impact polystyrene is extruded onto the 70-mil EPS. Next is thermoforming in a separate operation into a three-compartment 2"-deep tray with the foam on the inside to keep food at the right temperature and the HIPS on the outside to provide a glossy attractive KFC-red appearance. Genpak's Ed Rider claims the two-layer tray is commercial in Europe but that this represents the first use of it inthe U.S. One of the key challenges he adds is figuring out what to do with the trim scrap. Genpak has apparently solved that problem and Rider says the trays it makes for KFC have reprocessed scrap in them but he chooses not to elaborate on just how it's done. Completing the new packaging concept is a clear dome of polyethylene terephthalate. It's thermoformed by Genpak from sheet that is 15 mils thick. Genpak also extrudes the sheet for the domes using Eastman (Kingsport TN) PET resin. In the trim press that cuts individual domes from the sheet after thermoforming vents are punched into the area that will be used over the chicken. This lets steam escape so that coatings on the chicken won't get soggy. An intriguing feature of the dome/tray combo is the way the two fit together to prevent leakage of sauces or juices from one compartment to another. A small channel nearly 1/4" deep formed in the walls of each of the tray's compartments mates with a formed ridge on the walls of the dome. When restaurant workers apply dome to tray these formed parts compress in a male/ female fashion thus securely segregating food in each compartment.
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