Stop Guessing, Start Measuring

Dryer thermometers read the ambient air temperature inside the heating chamber — not the ink sitting on the garment surface. A donut probe is the only reliable way to verify your ink is actually reaching cure temperature.

Undercure = Wash-Out Failures

Plastisol needs 320°F through the full ink film. If your print comes out looking cured but the ink hasn’t reached 320°F throughout, it’ll crack, peel, or wash off within a few cycles. The donut probe catches this before it ships to your customer.

Overcure = Scorched Garments & Wasted Energy

Running hotter or slower than needed burns garments, yellows whites, and wastes thousands of kWh per year. Dialing in with a donut probe typically pays for itself in under a month from energy savings alone.

New Ink or Dryer? Profile It First

Every new ink type, new mesh count, or new dryer setup changes your cure profile. Running a donut probe pass before production is a 2-minute job that prevents entire-run rejects.

1. Inspect & Connect

Make sure the Teflon tip is clean and free of ink residue or debris from previous runs. Plug the Type K connector into your Vastex, BBC, or other Type-K compatible thermometer.

2. Set Up Your Dryer

Preheat the dryer to your target temperature (320°F for most plastisol, 300–310°F for water-based/discharge, manufacturer spec for specialty inks). Let the dryer reach steady-state for at least 10 minutes before probing.

3. Place the Probe on a Garment

Print a test shirt (or use a pre-printed scrap in the same ink/mesh combo). Lay the donut probe flat on the wet ink in the center of the image. The Teflon ring protects the garment while the sensor reads the ink directly.

4. Send It Through the Dryer

Place the garment on the belt. The cable trails behind as the shirt passes through the heating chamber. Watch the thermometer in real time — you want to see the ink rise past your target cure temp and hold for the minimum dwell time specified by your ink manufacturer.

5. Adjust & Re-Run

If the ink didn’t hit temp, slow the belt or raise the heater. If it overshot, speed the belt or lower the heater. Re-run until you consistently hit temp for the required dwell time. Record the belt speed and heat setting for future production runs.

6. Verify on Every Ink Change

New ink, new color, new mesh count, new garment weight — anything that changes your ink film or absorption should trigger a new probe run. Takes 2 minutes. Saves entire runs from wash-out failure.

Needs a Thermometer Too

This is the probe only — it plugs into a Type-K thermometer or data logger. If you don’t have one yet, ask us about the Cooper-Atkins AquaTuff 35100-K or 35200-K kits that include the matched thermometer.

Works With Any Type-K System

Standard Type K miniature plug. Works with Vastex dryers, BBC dryers, Interchange, ROQ, and any Type-K compatible handheld or datalogger.

Replace Every 1–3 Years in Production

The silicone cable and Teflon ring are durable, but daily production use will eventually degrade accuracy. For production shops, plan to replace the probe every 1–3 years (much less often for occasional use).