Ink tack, viscosity, and pressroom temperature

Tack is not a personality

Tack is how the film splits between rollers and paper. High tack can pick a weak coat. Low tack can slur and trap badly. Catalog tack numbers are measured at a stated temperature on a tackmeter. Your hall is rarely that room.

If the plant is cold at night start, LC-0011-class high-gloss inks feel heavier. If the hall is hot, the same ink can fly. HuiRun will quote the TDS tack window; we will not invent a number for your unmeasured room.

• Read hall temperature at the unit, not at the office thermostat.
• Warm tins slowly; do not torch a cold can.
• Reducer changes tack—record the dose.
• POP / synthetic stocks often need a different tack map; see that article.
• UV tack is a different test; do not compare to conventional.

Viscosity versus body

Operators say “thick” when they mean short or long. A short ink can still be high viscosity. Incoming inspection should compare a drawdown to the retain, not only a finger swirl.

Summer and winter lots

Some makers ship seasonal adjustments. If a summer lot arrives in a cold warehouse, let it equalise before you judge piling. Tell HuiRun the season and the hall range when you inquire.

When to change grade instead of temperature

If the board picks at a normal 22–25 °C hall, you may need a lower-tack conventional or a different stock. Do not ice the room to save a mismatched tin.

What the quote covers

We do not run your HVAC. We ship named SKUs with manufacturer tack data and ask for the temperature you measured when a complaint arrives.