These printers can use white, varnish, and/or gloss as spot inks. To configure them, you must choose the correct resolution (check them out in this article), then go to the Page Setup module, open the corresponding tab and then click on Enable separation:

You can independently enable White, Matte Varnish, and/or Glossy Varnish in the specified tabs.

Each extra ink that is not specified in the resolution name will automatically be added to an extra layer with rewind following the “Multipass layers order” parameter and the tab’s order: Matte Varnish is printed before Glossy Varnish.

Multilayer printing

Multilayer without rewind

The printer allows two types of resolutions:

• XXXxYYY: the base layer is CMYK only.
• XXXxYYY-Suffix: these modes work as bi-layer and print both inks at the same time in the specified order shown in the resolution: 720x1440-CMYK White is for example different from 720x1440-White CMYK.

Multilayer in independent jobs

To print multilayer as independent jobs, you can use the “Rewind at end” option. It will rewind the media to its initial position after printing. This is useful if you want to use different images in the same print for each layer like in sandwich mode.

The "sandwich" mode (CMYK-White-CMYK)

If you want to create a double-sided printing on transparent media (everything on the same side of the media) with different images for each side, try the following:

1. First job: CMYK layer only for the back side with image 1 resolution: 720x1080 Enable the mirror option in Page Setup. Enable the printer parameter "Rewind at end".
2. Second job: white and CMYK for the front side with image 2 resolution: 720x1080-White CMYK Disable the mirror option in Page Setup. Enable and configure the White tab(s). Disable "Rewind at end".

Multilayer in one job with automatic rewind

If you want to print an image containing data for CMYK and White/Varnish layers in one Print action but two layers with rewind, you can combine the multiple layers with both bi-layer resolutions and automatic rewinding between layers. In that case "Rewind at end should be disabled:

• It is a single "Print" action containing the entire configuration.
• Once configured, there is less room for error.

For multiple copies: set the number of copies but do not change any other parameter.

Extra inks and multilayer

You can independently enable White, Matte Varnish, and Glossy Varnish in the specified tabs. Each extra ink that is not specified in the resolution name will automatically be added to an extra layer with rewind following the “Multipass layers order” parameter and the tab’s order: Matte Varnish is printed before Glossy Varnish.

Examples:

1. Resolution: 720x1080 / White enabled
   The sequence will be: White layer > rewind > CMYK layer.
2. Resolution: 720x1080-White CMYK / White enabled
   The sequence will be: White under CMYK layer in one pass.
3. Resolution: 720x1080-White CMYK / White and Glossy Varnish enabled.
   The sequence will be: White under CMYK in one pass > rewind > Glossy Varnish.

Not printing the CMYK layer

You can also disable CMYK inks to print only a layer of White, Matte, or Glossy Varnish. To do this, select a resolution without suffix and enable the printer parameter "No CMYK pass". This enables jobs with only White or Varnish. Use this method combined with "Rewind at end " for the previous print, to add a layer of White or Varnish to the existing print.

This option also allows you to print Varnish on top of White without colors.

Not printing the white layer

You may encounter data errors with the Roland LEJ-640 CMYKWW driver if you use the 720x1080_CMYK White resolution. Please use the 720x1080_HighCMYK White (actually High White over CMYK) resolution.

Multiple layers of the same ink

You can print multiple layers of the same extra ink (White or Varnish) using the “layers number parameters. For instance, if you need more White coverage, you can add a layer of White by increasing the printer parameter "White layers number". It can be combined with bi-layer resolutions.

Examples:

1. Resolution: 720x1080 / White enabled / White layers number: 2
   The sequence will be: White layer > rewind > White layer > rewind > CMYK layer.
2. Resolution: 720x1080-White CMYK / White enabled / White layers number: 2
   The sequence will be: White layer > rewind > White under CMYK in one pass.

Print CMYK under White in one job

When printing on the back side of a transparent media, you can revert the order of layers to print CMYK closest to the substrate and add White on top of it. To inverse the layer order, you have two options:

• Select a resolution with an appropriate suffix like 720x1080-CMYK White. It indicates that CMYK is under White.
• Use the multilayer printing by setting the printer parameter to "CMYK- >White" or "Varnish- >CMYK- >White" according to the printer model.

Advanced job examples

First example

• Expected:
  • 720x1080 resolution for White, then CMYK, then Matte Varnish for embossing, then Glossy Varnish
• Parameters:
  • Resolution is: 720x1080-White CMYK
  • Enable and configure White, Matte varnish, and Glossy Varnish tabs.
  • Set printer parameter "Matte Varnish overprint"
• Print sequence:
  • White under CMYK as one layer > rewind > Matte Varnish > rewind > Glossy Varnish.

Second example

• Expected:
  • 720x1080 resolution for a Sandwich mode print (two different images on the same transparent media) with a Glossy Varnish on top.
• Parameters first job: image 1
  • Resolution is: 720x1080-CMYK White
  • Set the mirror option in the Page Setup.
  • Enable and configure the White tab.
  • Enable “Rewind at end”.
• Parameters second job: image 2
  • Resolution is: 720x1080
  • Disable the mirror option in the Page Setup.
  • Disable the White tab.
  • Enable the Glossy Varnish tab.
  • Disable “Rewind at end ”.
• Print sequence:
  • First image mirrored CMYK under White as one layer > rewind
  • Second image CMYK > rewind > Glossy Varnish.
  • To improve quality, printing a thin, uniform layer of Matte Varnish before printing Glossy Varnish is advised. See the third example for more details.

Third example

• Expected:
  • 720x1080 resolution for a Sandwich mode print (two different images on the same transparent media) with a thin Matte Varnish and then a Glossy Varnish on top.
• Parameters first job: image 1
  • Resolution is: 720x1080-CMYK White
  • Set the mirror option in the Page Setup.
  • Enable and configure the White tab.
  • Enable “Rewind at end”.
• Parameters second job: image 2
  • Resolution is: 720x1080-CMYK Matte Varnish
  • Disable the mirror option in the Page Setup.
  • Disable the White tab.
  • Enable the Matte Varnish tab with a 5% density and enable the Glossy Varnish tab.
  • Disable “Rewind at end”.
• Print sequence:
  • First image mirrored CMYK under White as one layer > rewind
  • Second image CMYK under Matte Varnish (5%) > rewind > Glossy Varnish.