that is a Shirt pile of ink and we see the same when we over heat the ink deposit.
As Endless said a heat press will solve the problem, about 275 deg 7 seconds at moderate pressure.
If you use parchment paper (baking paper) instaed of teflon sheet you will get a dull finish instead of a glossy finish from the teflon.
The hand will be real soft and nice.
mooseman