When the printing form is lifted off the paper, the ink exerts a force on the paper. This force increases with the viscosity and tack of the ink and the printing speed. If this force exceeds a certain value, the surface of the paper is damaged. The IGT pick test can also be used to assess the delamination resistance of a board liner.
The pick velocity is defined as the velocity at which picking starts: the pick resistance is characterized by the product of pick velocity in m/s and viscosity in Pa.s of the pick test oil used.
Standards and accreditation
Testing is made in accordance with British Standard BS 6225:2, Tappi 514 and International Standard ISO 3783.
IGT pick testing is included in Smithers' Paper Proficiency Service
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