Your ask is for a material that behaves like an uncoated fabric.. but then you mention hems..
First - any coated fabric will not lay flat after folding. Limits you to pure polyester and there's no poly that eco solvent can go to.
For a nice canvas look. I've used Sonoma Graphics Venetian heavy canvas. freaking gorgeous off a Roland.. but you must hem it.. they do have some fabrics that are eco solvent friendly.
Www.Sgpweb.com
As for Hems on vinyl banners.. my rant.. Hems are a throw back to the old days of cotton sign cloth. They're basically unneeded in modern nylon scrim fabrics which are rip stop.
Having worked in this trade back when cotton sign cloth was prominent and vinyl was yet to be, i can tell you the old fabrics tore quickly unless hemmed. Vinyl coated Nylon scrim was sold as an upgraded rip stop, and withstood much more wind load than its cotton forbearers. I've seen Cooley scrim banner material support a 7,000 lb billboard from falling..
So long as you properly grommet so it spreads the tension loading without the grommet cutting the scrim you can skip hemming most of these modern fabrics even for outdoor use. If you do hem it needs to be welded.
Structurally the only hem that improves the strength is a heat welded or solvent welded hem that fuses the coatings. Tapes do not spread any load nor reduce any edge failure potentials. In fact, the tape will worsen the situation, the tape layer causing a flexing on the edge and at the grommets, loosening the grommets "set" in the material. Once loose it can cut the fabric and fail. Even then the grommet failure is not a structural fabric failure. Sewn hems are akin to perforation on paper, most failures occur on the sewn line.
For indoor use you can skip the labor expense of hemming without any issue to your client.
My firm paid an engineer review the hemming options for banners for a product we made. The only issue is the customer's expectations, that is on your sales forces side to deal with.
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