Essentially it is a matter of the creator noticing things a lot more clearly and precisely than the customer. While it is possible someone might notice and complain, it is unlikely, and probably not worth the expense (both time and money) to pre-wash all of the shirts.
I'm experimenting different types of pressure and different T-shirt materials to make the pressed line as invisible as possible. If the line is there, I will resort to wash it first before I sent out. Time consuming I know but I'm putting myself in customers shoes as I, personally, will be disappointed to receive a purchased T-shirt with pressed line.
jdr: The paper isn't what is leaving the line; the press is. I get the same thing now, and another person asked about it a few weeks ago as well. Where the press clamps down (the edges) on to the shirt it leaves a faint but visbile crease line.
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