Our high speed tabbing equipment has heated rollers.

In some cases, when tabs with body copy are run through the heated rollers, the ink bubbles or even gets lifted off the sheet. 

Use heat-resistant and wax -free inks and varnishes when supplying printed tabs to help eliminate this problem. 

Porous stocks are optimum for Mylar jobs because air has the ability to escape into the paper. Uncoated, 70# index stock is the most commonly one we use. Coated stocks, along with heavy ink coverage, can trap air and create bubbles that can distort the readability of the tab.

Tabs without body copy have no problems.

Consider this when planning tabs and if you have any concerns, send us a sample and we will test it.  It is better to locate a problem before rather than after printing a job.