First, I am guessing that the heat and pressure of the iron do something to rela

Question

First, I am guessing that the heat and pressure of the iron do something to relax the fibers, but how does this work on a molecular level and why does it work with multiple types of materials? Since some fabrics burn or melt at different temperatures, requiring different heat settings on my iron, it would seem that there might be different effects on the various types of molecules involved in the various fabrics. What is the underlying process and is it the same for synthetics, cotton, wool and so on? Why does the fabric stay flat when you lift the iron and release the pressure? Why do some creases never iron out, particularly on synthetics?

Explanation / Answer

Thinking of the pure physics of it, if you

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