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In: Physics
When you iron a crease “into” a shirt – you are basically bending and folding the fabric at a certain place – and the “bend or fold line is visible” as a crease. Folding and pressing it with a hot iron – sort of – seals the fold and makes it semi – permanant (i.e. until you uncrease it). In other words – you commit that crease / fold shape to the memory of the fibers at that location.
When you are uncreasing it – you are flattening the fold out and making the “fold line” disappear. This works well if you try to iron the shirt on a very firm and lightly padded surface – you will be able to unfold the line pretty well (but not 100%). That is because fabric threads retain their creased shape – as if its imprinted in their memory.
The best option to remove a crease is to wet that fabric at the crease location, let the thread fibers become soft and pliable (lose their crease memory) and then iron them with a hot iron to imprint new “uncreased” memory state onto it.
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