three ways to flatten crumpled paper - Why can't creases be taken out of a paper?

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3 Ways to Flatten Crumpled Paper - wikiHow

When paper is crumpled, its fibers become damaged and torn. ... Alternatively, press the paper while dry to make it flat, but not remove the wrinkle lines. Image ... Smooth it out with your hands to make sure there are no major folds or crease.

For more information, see 3 Ways to Flatten Crumpled Paper - wikiHow