USA: General Mills gets patent for curl flakes to lower bulk density
General Mills ' 6 February patent 6183788 titled 'Flaked R-T-E cereal' is a simple concept: curl the flake, so the flakes don't remain flat on top of each other, and occupy more space than their flat counterparts. This lowers bulk density to <0.12, making them fluffy without any change in the flake per se.
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