Also make sure your paper is bigger than the foam. In other words, make sure the transfer paper hangs over the edges of the foam. I dont get paper lines doing it this way. Dont try to 'go cheap' and get as many images per sheet as you can. Press lines dont sell. Ruined shirts cost money as well as the paper and ink cost to produce an unsellable shirt. It is worth an extra few cents of paper to produce a shirt that will sell and has no paper lines.
The idea of the foam kit is to raise the printed area a little and have your paper to over-hang the foam - like Bobby said, so the edges will not get pressed and will not leave an impression in the fabric. While you are waiting for the foam kit you can try using a clean mouse pad (if you've got one).
Well, now where the shirt lays on the mouse pad...you can see that. It's like it's changing the texture of the shirt. Even the line from the heat plate is leaving a line...I'm not even pressing the press closed...just letting it lay on top. Could the temperature be too high???
Have you got a teflon sheet? If you put it on top of the mousepad inside the shirt it should smooth the texture of the mousepad. Temperature shouldn't really influence the texture - it's more of a pressure issue. You can also try to re-press the t-shirt for 5 sec or so after you have removed the transfer to level up the surface.
Some fabrics will "bounce" back in a while after pressing.
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