If you have increased this die pressure and found that it has had little to no effect, it is time to consider other possibilities. There are several valid reasons as to why wrinkles may still be present. – But why?Īfter seeing this, your first reaction should be to increase the pressure on the die because this will often eliminate the wrinkles. The bends started out good until about 30± degrees, then the wrinkles started to appear. The top picture above shows a partial wrinkle in two different bends.