Cure log
Humidity Tips
A quick floor note on moisture and ambient conditions when cure consistency starts drifting on press.
Shops keep seeing the same issue in winter and on damp coastal days: ink sits longer, flash times drift, and one setting from yesterday no longer cures the next run. Humidity Tips covers the checks print teams can make before a screen-print line starts wasting garments or board.
Humidity Tips helps press teams chasing cure drift. Winter mornings on the Highveld and sticky coastal weather around Durban can change how plastisol, water-based ink, and coated board behave under a flash. If you want to send your own conditions through the contact form, note the town, room reading, and ink system in use.
Room readings before first print
- Record temperature and RH at startup
- Photograph the first test print, flash setting, and room meter together
- Note the dryer type used, ceramic IR or quartz bank
- Add operator, press name, and branch location
The useful comparison is between ambient conditions and curing behaviour. The journal note explains what to watch when dwell time starts moving, while the catalogue helps identify whether the line is running a ScreenMaster-style flash cell, a ceramic IR unit, or a quartz bank. Keeping those details together makes the cure log far more useful on the next shift.
Where Humidity Tips matters in a normal print week
Humidity Tips looks at what ambient moisture can do to curing consistency. When results start drifting on press, it helps to check room conditions alongside dryer settings and garment behaviour.
Begin with the substrate and ink, then check the air in the room. A fleece hoodie, a cotton tee, and printed board will not pick up or release moisture in the same way, so one flash setting can drift across the day. Johannesburg dry spells, Cape Town damp spells, and Durban humidity each show up differently in gel point, handle, and final cure.
Keep a short note beside the press with the last stable setting and the room reading that matched it. When power returns after load-shedding or a door has been left open during receiving, that note gives the operator a starting point instead of a guess. It also helps when a repeat order comes back weeks later.
Signs moisture is affecting cure
Look for changes that appear without any deliberate dryer adjustment. Ink may stay tacky longer after flash, fibres may rise more than usual, or one stack of board may resist cure even though the previous stack ran cleanly. Those clues point back to room condition checks before anyone starts turning heater output up too far.
Use Humidity Tips alongside a line record and a Cure log entry when drift starts showing up on press. Before changing parts or widening the fault list, compare room humidity, substrate feel, and flash dwell from the current run. Dryer sizing depends on belt width, ink type and the pieces you run per hour, so list those in your message.
- Startup humidity logged with first flash test
- Operator notes tied to the actual run
- Current press conditions written in one place
Weather patterns that change settings
South African print rooms see big swings between inland winter dryness and heavy coastal air. A shop near Johannesburg might need to watch static, faster surface skinning, and dust landing on warm garments, while a Durban line may be dealing with slower evaporation and longer flash response.
Humidity does not act alone. Open roller doors, stock stored against an outside wall, morning startup after a cold night, and long pauses during load-shedding can all change what the press sees on the next pull. Reflectors and shields still need cleaning, but the room reading tells you whether the drift began in the dryer or around it.
Operated by Astros Marketing (Pty) Ltd from 2 Makro Place, Sunnyrock 1401.
Notes worth adding to the cure log
A quick floor note on moisture and ambient conditions when cure consistency starts drifting on press.
Write down the date, town, approximate room temperature, relative humidity, substrate, ink type, and the flash or tunnel setting that produced a pass. That record is more useful than a vague comment about a difficult day on press. When a buyer or production manager asks why settings moved, the log gives a traceable reason.