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Novomatics Operation Manual
AlphaTackPlus
2.4.
Principle of temperature control
The correct and stable temperature setting is one of the key factors for reproducible and
accurate measuring results. A deviation of one degree in temperature may lead to a
deviation in tack to five percent or more.
The AlphaTackPlus controls metal and elastomer roller temperature independently of each
other but at same set temperature. Platinum temperature probes are placed inside the rollers
close to their surface. So the nip temperature is stabilized with accuracy better than 0.1 °C.
The AlphaTackPlus active heating and cooling systems are encapsulated in the rollers and
operate without liquids for high reliability. Compared to water bath only a fracture of electrical
energy is consumed, essentially lowering operational costs during the instruments lifetime.
Why does the AlphaTackPlus stabilize the elastomer roller temperature?
Controlling only the metal roller may lead to deviations of nip temperature. Measurements
have shown that the yielding nip temperature is determined approximately 70 % by metal
surface and 30 % by elastomer surface. So the temperature of elastomer roller affects
essentially the accuracy of tack measurement.
Consequently the AlphaTackPlus has no specific warming up period. For example, after
switching on the roller temperatures are stabilized exactly at 30.0 °C in less than 3 minutes.
Because of these short response times the AlphaTackPlus can vary the nip temperature
during a measurement in defined manner too. So specific measurements like tack stability
vs. temperature can be performed easily.
Figure 4
8
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