| 摘要 |
A reusable plastic container for delivery products, such as a dairy crate, a bakery tray, a beverage crate or a produce tray, is formed of a composition including a plastic resin and an electrically conductive or magnetic material distributed substantially uniformly throughout the plastic resin. The electrically conductive or magnetic material can be carbonyl iron powder in an amount between about 0.25% and about 2.0% of the composition by weight. The powder is distributed throughout the container and is detectable by an electromagnetic detection apparatus for screening plastic materials for regrinding. The container has a notice affixed to it, which indicates that the container includes the electrically conductive or magnetic material and that discourages regrinding of the container.
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