Another way to reduce or eliminate hard paper lines from heat transfer is to tear the edge of your sublimation transfer paper. This causes a more gradual edge and also a less pronounced line so it will not be as noticeable. This is more of a Band-Aid as the lines might still be there, but it could get you over the edge if you are close to solving the transfer lines issue.
Aaron Montgomery is the co-founder of OurSuccessGroup.com. Its goal is to help 1,000+ businesses in 2020 reach their idea of success through training, community, and accountability. Aaron has 25+ years of experience with personalized products and small business development. You can also find Aaron co-hosting 2 Regular Guys podcast (www.2regularguys.com) He also has his own podcast channel and produces weekly live videos called Small Business Saturdays Series. New episodes are released smallbusinesssaturdayspodcast.com.