What is the role of the inner lid included in the TUTU storage container?
Seeing the double structure with a separate inner lid layered inside the enamel outer lid, you might wonder about the purpose of using a separate inner lid.
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The NODA HORO TUTU container layers a flexible EVA resin inner lid inside the rigid enamel outer lid to close tightly against the main body opening once more.
When using the TUTU container, the first part your hand touches is the outer lid made of the same enamel material as the main body[1]. When you lift this lid, a soft inner lid is fitted as one more layer over the inner opening.
Enamel, the material of the main body and outer lid, is made by baking glassy glaze onto a metal surface, so it is hard and does not easily absorb odors, but because it does not bend flexibly, minute gaps easily form along the edges when closed. On the other hand, EVA resin, the material of the inner lid, is elastic and soft like rubber, having the property of adhering tightly to the opening without gaps.
NODA HORO configured both the main body and lid with enamel[2], while adopting a double structure by adding this EVA resin inner lid on the inside[3][4]. Because the inner lid resiliently covers the gaps at the opening that the hard outer lid cannot fully close, it is good for storing tea or dried ingredients sensitive to moisture or odors.
hmmm, while maintaining enamel's characteristic smooth and neat finish on the outside, it assigns the practical purpose of airtightness to the inner lid on the inside.
The heat-resistant temperature of the EVA resin inner lid and whether separate replacement parts are sold have not yet been confirmed in official materials.