Paper is a hygroscopic material that happens to be printable. The room’s climate is therefore a press setting — one that too many plants leave on automatic.
Why the sheet cares
Paper exchanges moisture with the air around it, and it grows and shrinks as it does. A pile that lived in a cold warehouse and printed in a warm pressroom will wave at the edges and misregister at the tail by afternoon. Stable register starts with stable moisture, hours before the first impression.
Acclimatise the pile, wrapped
Bring stock into the pressroom in its wrapper and let it reach room temperature before opening — a day for small piles, longer for full pallets. The wrapper is the vapour barrier doing that job; opening it early trades one day of patience for a shift of curl and static.
Hold the band, log the drift
A pressroom that stays inside a steady temperature and humidity band all year removes a whole family of faults: static in winter, blocking in summer, and the mystery misregister that follows weather fronts through the plant. A simple logger by the press and one at the stock racks turns climate from folklore into a chart.
Mind the microclimates
Loading doors, heaters above the pile, sunlight through a skylight onto the delivery — local effects move one pile while the room average looks perfect. Walk the stock route occasionally with the logger in hand; the chart will show what the thermostat cannot see.
