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Humidity Tips
A short note on humidity and how it affects media handling, static and colour consistency on large-format jobs.
Winter dry air and summer damp can both throw a print run off. Humidity Tips covers the checks that matter on South African large-format floors, from media storage and room conditions to the profile drift that shows up as banding, weak reds or slow drying.
Humidity on the print room wall matters as much as the artwork file when media starts lifting static or ink stops drying the way it did last month. This note sticks to checks that help on Gauteng winter mornings and on sticky coastal days in KZN and the Western Cape.
Checks before media comes off the rack
- Room RH and temperature noted first
- Media wrap checked for moisture or static cling
- Profile name matched to the stock in use
- FastJET, Stormjet or Skywalker settings recorded
Keep the humidity note next to the ICC profile used for that media. One shows when room moisture is pushing vinyl, paper or banner stock off its usual behaviour, and the other shows whether colour drift belongs to the environment or the setup. Used together, they help separate static, feed trouble and weak colour before more sheets are wasted.
How Humidity Tips works into a real week
Humidity Tips explains why room conditions affect more than comfort on the print floor. Low or uneven humidity can change media handling, increase static and make colour consistency harder to hold.
Dry Highveld air can make vinyl snap, attract lint and show weak solids on long runs. Along the coast, damp conditions can slow drying, soften some papers and change how media feeds across the platen. Johannesburg, Durban and Cape Town shops do not see the same drift, so the note focuses on what to check where you print.
Take the first reading before heaters, doors and people change the room. A quick photo of the hygrometer beside the loaded media often explains more than another message about banding or patchy reds. Keep that image with the job notes if the same stock gives trouble again.
What to look out for
Use Humidity Tips to separate colour drift from handling trouble before you chase the wrong fix. The useful outcome is a short check list for storage, acclimatisation and print conditions, plus a clearer idea of whether to revisit the profile or the room. On a busy shift, one sound reading beats guessing from the print alone.
Read Humidity Tips alongside Profiles, Presses and Swatches when a job changes between seasons or between inland and coastal sites. Before sending a question through the contact form, note the room reading, the media type and whether the issue showed up on FastJET, Stormjet or Skywalker. Those three details usually narrow the problem faster than a long description.
- Checks tied to media and room conditions
- First humidity reading captured before print starts
- Notes useful for shift handover records
Season changes that affect print rooms
Inland winter often brings very dry mornings, more static and fussier media loading. Summer storms can push moisture up quickly, especially where stock is stored near roller doors or in rooms without stable air control. If a FastJET, Stormjet or Skywalker job shifts with the weather, log the reading and the stock condition before changing curves or passes.
Cape Town sea air and Durban humidity can lengthen drying times on some coated media. Gauteng dust in a dry room can cling to rolls and show up as fine defects that look like a printhead issue at first glance. Load-shedding also matters because air control stops, doors open and the room can drift well outside the range used for the last good run.
Operated by Astros Marketing (Pty) Ltd from 2 Makro Place, Sunnyrock 1401.
Humidity points worth writing down
A short note on humidity and how it affects media handling, static and colour consistency on large-format jobs.
Record the RH, temperature, media type and how long the stock stood in the room before printing. Add any change in static, feed behaviour, drying or colour strength while the sheets and offcuts are still there to inspect. Those notes make later profile checks far more useful than memory alone.
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