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PET spreads to mayonnaise (sidebar)

Mayonnaise makers, suppliers study PET

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Martin Gillet and White Rose Foods see PET as a likely choice for mayonnaise packages in the future.

They credit their mayonnaise in PET introductions to a joint study spearheaded by Grafco PET Packaging Technologies, closure vendor Phoenix Closures and food science researcher Guelph Technologies (Guelph, Ontario, Canada).

In 1997, Grafco approached about a dozen mayonnaise manufacturers about the possibility of using PET containers for the product. The companies were asked what barrier properties, shelf life and economics they would need to seriously consider shifting to PET.

A key concern was the possibility of paneling. "Normally, paneling occurs when hot-filled product cools," notes Lindsay Mulholland, Guelph's manager of applied research group.

"But you don't have that with this [ambient temperature-filled] jar," he continues. "What you have is a product that reacts with oxygen in the headspace and consumes a portion of that oxygen. That creates a vacuum. It doesn't take much pressure to draw in the sides of a PET container. PET isn't perfect, but it has a good barrier against oxygen ingress."

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