I’ve been reading a lot about inkjet printing in the online journals recently. I have seen trends in the market toward improved inkjet for publications printed on roll-fed equipment that can produce significantly better quality than in past years in an economical manner.
However, along with the new trend (which just may usurp laser printing as a means for producing long-format documents digitally, such as textbooks and periodicals) I have seen a steady growth in large format printing on inkjet equipment. Why? Because it’s profitable. Why is it profitable? Because the quality is there, it’s infinitely variable, and it is economical. More importantly, large format printing is striking and memorable. Moreover, since many of the inks are water soluble, it’s also environmentally sound.
I thought you might find it interesting to review some of the substrates on which you can effectively print using digital inkjet equipment. Some of these will be familiar. Others you may not have thought about.
Large Format Signage
When I think of signage, I now think almost exclusively of grand-format inkjet, although people are still crafting permanent metal and glass channel letters for signs, or cutting and grinding wood, or manufacturing building signs out of stone or concrete.
But inkjet sign-making offers a lot of options for significantly less money. You can print on vinyl scrim, then hem the edges, and insert grommets to allow for tying up the large format print with ropes. (I once hung a banner like this on the exterior facade of a building. As I recall, it covered three stories of the structure. Since we had only a small crew of installers, I was struck by the way the wind tried to pull the huge banner out of my hands like a big kite or a sail.)
If you’re printing a similar large format graphic, talk with your large format print supplier about options. Your printer will need to know whether the print will be hung indoors or outdoors, as this will affect both the substrate and the inks used. For instance, solvent-based inks will be more light-fast (i.e., will tolerate the sunlight without fading) and will also stand up to weather (rain). Water-based dyes and pigments are fine for interior signage (particularly if the banner is temporary), but for exterior use, you need inks that are more robust.
So to be safe, think about how long you want to keep the banner, and where it will be displayed (even an indoor sign hung near a window will fade when exposed to sunlight day after day). Discuss with your custom printing supplier the various substrate options (vinyl, paper, and canvas–if interior–or even mesh, if you plan to affix the graphic on a window and you will need to see through the banner). You may also want to ask about inks (solvent, eco-solvent, UV, latex, dye vs. pigment). Some are more durable. Some provide more intense colors. Some are less taxing on the environment.
All of the aforementioned papers, fabrics, are meshes are essentially flexible substrates that come on rolls. But you don’t have to stop here. Depending on the kind of large format printing capabilities your supplier offers, you may even be able to print on rigid substrates such as doors and glass. Essentially, instead of either draping a banner on a wall or gluing it to a backing board, you can just print the graphic right on the wood, metal, or other rigid substance, but only if you’re using a flatbed digital inkjet press (not a roll-fed press).
When you’re discussing such work with your commercial printing supplier, here are some things to consider. If you’re printing on glass, for instance, you’re printing on a non-porous substrate. Regular inkjet inks will dry but not adhere to such a surface. However, using UV inks, which cure instantly when exposed to ultraviolet light, you can print directly on non-porous surfaces, either flexible (with a roll-fed inkjet printer) or rigid (with a flatbed inkjet printer).
Again, it’s smart to discuss with your printer the environmental conditions in which you plan to hang the graphic. UV inks do adhere well to flat, non-porous surfaces, but they can still be scratched off. So discuss rub resistance with your printer, and ask about any surface coatings that might further protect your large format print image.
Vehicle Wraps
Let’s not forget the potential marketing space on the side of a bus or a car. Vehicle wraps are hot. They will make a car or bus really stand out from all the other vehicles on the road. Do keep in mind, however, that printing on the vinyl is just a part of the process. You also need a skilled vendor who can adhere the graphic to all the nooks and crannies of the exterior of a car or bus. This is specialized work. Done well, it can be heart-stopping. Done badly it can be a waste, or it can damage your brand.
Fabric Printing
You can write books on the current digital custom printing options available for interior design. You can print drapes, bedding, pillow covers, wallpaper. Fortunately, these are all interior uses of large format printing. However, in this case the composition of the fabric will determine the particular technology you use. Direct inkjet is fine for cotton-based fabric. However, for polyester, you need to either transfer the graphic from a carrier sheet to the substrate (with some technologies, you can initially print directly on the substrate) and then sublimate the fabric inks into the polyester fibers using intense heat. Fortunately this technology preserves and in some cases actually improves the vibrant colors of the fabric inks.
And if you don’t need to produce bolts of fabric for interior design, you can always print on fabric to create flags and table throws. (Table throws are large graphics on fabric that can be laid over a table at a convention site, providing a marketing opportunity as well as protecting the table.)
Or you can print on garments. While these really aren’t large format print graphics, inkjet is still suitable (direct inkjet for cotton and dye sublimation for polyester). Or, you can print on vinyl transfer material and then use a heat press to adhere the graphic to the t-shirt or other garment.
What to Consider and Discuss with Your Printer
First of all, most printers will not have all of these technologies or inks. You may need to do some research and request samples to verify quality. Ask your current print suppliers. If they can’t do something in-house, perhaps they can refer you to a trustworthy large format print supplier.
Then describe the kind of graphic, the environmental conditions, and the length of time it will be in use. (Fortunately, such things as vehicle wraps can be repaired. Since they come from digital files, if you damage part of a car wrap, you can just print out a small section, and remove and replace the damaged part of the graphic.)
Discuss the various substrates (canvas, vinyl, fabric, paper, film, back-lit film) and the various inks (dye-based vs. pigmented ink, latex, solvent, eco-solvent, UV) and their durability and color properties (color gamut, intensity, color fidelity, and such).
I’d also encourage you to research these variables yourself, online, in addition to searching for a trustworthy large format printing vendor. And it’s always prudent to request samples. When you have the samples, don’t hesitate to test them. (For instance, if your banner will be outside, get the sample wet and see how it fares.)
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on Tuesday, January 29th, 2019 at 4:03 pm and is filed under Large-Format Printing.
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