Film quality is vital to your screen printing success- without a great film, you will not get a great shirt. There are several ways in which printers can achieve a more opaque film positive.
1. Double up your films. This is the most basic thing you can do to ensure your films have a high enough opacity to allow you to properly burn your screen. Print your image on two films and then stack them. A lot of screen printers get their start by doing this and later move into other options that are more cost effective.
2. Software settings. CorelDraw offers a setting that will allow you to gain a more true black when printing out your films. If you go up to tools > color management > default settings, check the preserve pure black box. Other programs such as, Illustrator and Photoshop, may have similar options. Ryonet is setup with CorelDraw only and has not been able to test any settings in other programs.
3. Rip Software. Ryonet proudly offers Accurip as our rip software of choice. Not only does this software allow for you to print halftones for gradient printing, it also gives you full control over how much ink is laid down on your film, and it allows you to put all black ink into each slot to fully convert your printer over to a film output machine. Here is a video for more information: https://www.youtube.com/watch?v=nUTNFU0xR08
NOTE- THIS SOFTWARE IS COMPATIBLE WITH ONLY CERTAIN MODELS OF EPSON PRINTERS. YOU CAN VIEW COMPATIBILITY HERE: http://support.silkscreeningsupplies.com/entries/20560033-Epson-Models-Supported-by-Accurip
4. Dye based ink and Waterproof film. Ryonet offers the blackmax, dye based ink and the Rite film, waterproof film. Making sure you have the correct type of ink (dye based vs pigment base) for the correct type of film is vital. There are films out there that are intended for use with pigment based inks only, and wading through all of the information and specs can be tedious. If you have the incorrect ink for the incorrect film, you can experience a loss in opacity as well as ink rubbing off or changing color on the film. Dye based ink is formulated to achieve higher opacity on film and waterproof film has a water receptive layer, that helps the ink to settle into place and dry quicker. This also aids in film opacity as it prevents the ink from running or spreading on the film. Using a more opaque ink and more opaque film will result in less ink used to double up, less film used to double up and no need to fill your printer with colored ink that you may never use.
NOTE- ACCURIP (OR ANOTHER INK MANAGING RIP SOFTWARE) MUST BE USED IN ORDER TO CONVERT YOUR PRINTER OVER TO AN ALL BLACK INK SYSTEM.