Penetration

By Inkjet Insight / Published:

The extent to which a printing ink vehicle, solvent, or varnish (or any other liquid, such as water) is absorbed into the surface of a substrate. Inks that dry by absorption of the vehicle require …

Percent Mullen 

By Inkjet Insight / Published:

The expression of a paper or paperboard’s bursting strength, determined using a Mullen test, as a percentage. (SeeMullen Test and Bursting Strength.)

Perforating 

By Inkjet Insight / Published:

In binding and finishing, any operation which punches tiny slits or holes in a sheet of paper or other substrate. Perforating is performed either on press or off press using perforating dies. …

Perforating Rule 

By Inkjet Insight / Published:

A device used for on-press perforating consisting of a spiked strip or letterpress attached to the blanket or impression cylinder of an offset press.

Perforation 

By Inkjet Insight / Published:

A series of slits or cuts made in a paper or other substrate, used for portions of a page which are intended to be removeable. See Perforating.

Permanence

By Inkjet Insight / Published:

A paper property that measures a paper’s resistance to changes in its chemical, structural, or optical properties over time. Permanence includes such things as resistance to yellowing and fading upon …