There are primarily three ways to produce a vinyl banner with seams. Sewn Edges, Hem Tape, and Heat Welding.
Sewn Edges
We utilize the first method mentioned which is sewn edges. We have a commercial sewing machine that folds over 1 inch of your banner material around the entire perimeter and sews a double lock stitch directly into the banner. This is an extremely strong and durable way to produce a banner seam. One might ask why even put a hem onto a vinyl banner? There are a variety of reasons, for outdoor banners specifically the hem is twice as thick as the rest of the banner giving the grommet a strong location to be attached to. While the banner flats in the wind the sewn edges take the majority of the force preventing the banner from ripping.
Hem Tape
A low cost alternative to sewing the edge of the banner involves using a commericially available double sided tape. The tape is stuck to one side of the banner all around the edges then folded over. This is a suitable seam for most uses even outdoor. Drawbacks can come from the breakdown of the tape adhesive over the years.
Heat Welding
Heat welding banner seams is a combination of the two methods above. Just as you would feel a vinyl banner through a sewning machine you feed the sign through a welding matching. Once the material is folded over it reaches over 600 degrees causing the vinyl to literally melt (weld) together. While doing so even if the imprint bleeds to the edge it is undamaged by the process. Heat welding is durable however can fail if temperature settings are not adjusted properly.