Popcorn bag

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Description:
A popcorn bag is a specially designed, microwavable bag that contains popcorn, along with oil, spices and seasoning.

Design

The bag is typically partially folded when it is placed in a microwave, and inflates as a result of steam pressure from the heated kernels.

The design of a microwave popcorn bag is specifically keyed to avoid popped kernel scorching, an undesirable effect that takes place when popped kernels are heated above .

A susceptor, usually a metallised film laminated onto the paper of the bag, absorbs microwaves and concentrates heat at the film interface, thus ensuring a heat distribution focused on the hard-to-heat flavor coating so that the unpopped kernels are evenly coated prior to popping, thereby ensuring even flavor throughout the product.

An early susceptor popcorn bag design was patented by the American company General Mills in 1981 (US Patent #4,267,420).

Safety issues

One danger of the microwave popcorn bag is that after one use the susceptor typically "will lose its ability to safely react to microwave energy. If it is reheated, the changes in the susceptor can cause it to burn."

In 2006, concerns were raised about the levels of perfluorooctanoic acid (PFOA, a chemical related to Teflon) in popcorn bags. When opening the popcorn bag directly to the face, it is possible to uptake harmful levels over time. The high temperatures used in popping popcorn may facilitate the...
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