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Novomatics Operation Manual
AlphaTackPlus
8.2.2.
Dependent Variables
Pressure related variables
These variables correspond to the first part of the measured
pressure distribution
function.
They are essentially up from applied line force, inner friction of ink and dynamic mechanic
properties of elastomer roller.
Integral Pressure [N/m]
The integral force indicates the complete vertical force that is applied to the ink during its
way through the roller nip. It is the integral of the
pressure distribution function
over roller nip.
It corresponds exactly to applied
line
force.
The integral force is expressed in relation to roller length.
Tack related variables
These variables correspond to the second part of the measured
pressure distribution
function. They are up only from the splitting dynamic of the ink under applied test conditions.
2
Peak Tack [kN/m
]
The peak tack Pressure denotes the minimum of the
pressure distribution
function. It
indicates the maximal vertical tack force that is effective to the ink during the film splitting
process.
Integral Tack [N/m]
The integral tack denotes the complete vertical force that is needed to split the ink film after
leaving the nip. It is the integral of the
pressure distribution function
over the film splitting
process.
The integral force is expressed in relation to roller length. It is the force moving apart inks
covered measurement and elastomer under the applied conditions.
Tack Width [mm]
The tack width describes the distance between start and end position of film splitting
process.
Length [mm]
The variable length is the quotient of Integral Tack and Peak Tack. It describes the inks
tendency to create longer filaments during film splitting process.
Generally the length of ink indicates the ink's tendency to form long filaments when stretched
or pulled. "Longer" inks flow better but incline earlier to mist or fly. The shape of the splitting
process indicates the length of ink under the applied conditions. A longer splitting process
combined with lower peak tack shows a stronger tendency to build longer filaments than
opposite.
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