11 Common Problems in Sublimation
and how to solve them quickly
Incorrect colors, streaks, damp paper, incorrect parameters. They all have clear causes and simple solutions. Complete diagnostic guide.
incorrect parameters
time · temperature · pressure
for head cleaning
Most people get very good results with sublimation: vivid colors, clear images, identical to those on the monitor. But if you are here, you have probably encountered a problem, and your image does not look as it should.
Sublimation is a process with many variables: printer, ink, paper, heat press, blank, parameters. When something goes wrong, it is easy to get lost. This guide helps you diagnose the problem quickly and gives you the exact solution.
🔍 Quick diagnosis
What is your symptom? Click the appropriate button to jump directly to the solution:
Clogged printing heads (Nozzle)
Symptoms:
- The colors do not match those on the monitor (red, blue, or greenish tint)
- Streaks appear on the printed image
- The image has incomplete or uneven areas
Here is what the effect looks like on the final product, direct comparison:
- From the printer panel, select Print Nozzle Check
- Compare the result with the correct pattern (all lines complete)
- If lines are missing, run Clean Nozzle / Head Cleaning
- Run Nozzle Check again to verify
- Repeat the cleaning 2–3 times if needed
Wrong or damp sublimation paper
Symptoms:
- Blurry spots appear on the paper (like water droplets)
- The ink migrates into the paper (blotting paper effect)
- The final image is faded or has blurry edges
- The ink passes through the paper and stains the platen
How to store paper correctly
Sublimation paper is porous and absorbs moisture very quickly. It must be stored in airtight packaging, away from sources of moisture.
- Place the sheet of paper on the heat press (without a T-shirt/blank)
- Set 180°C and press for 10 seconds at medium pressure
- Let the paper cool on a dry surface
- Use the paper immediately after drying
Incorrect parameters (time, temperature, pressure)
Symptoms:
- Temperature too high: brown to black tint, the image looks pixelated
- Temperature too low: pale colors, white spots on the image
- Time too short: incomplete transfer, faded colors
- Incorrect pressure: uneven image, white areas
- Check the complete Green Print parameter list
- Start with the recommended values
- Do a test on 1 piece before the full run
- Adjust ±5°C or ±5 seconds if needed
- Write down the parameters that work for you
Wrong or mixed ink
Symptoms:
- The ink does not transfer to the blank at all
- The transfer is very weak or oddly colored
- Print heads clog quickly
- Use only professional sublimation ink (we recommend Hongsam ink)
- Do not change the ink brand without completely cleaning the CISS system
- Reserve a printer exclusively for sublimation
- Check the ink expiration date
You forgot to mirror the design
Symptoms:
- The text comes out reversed on the final product
- Images with logos appear reflected
- The design is identical on screen, but reversed on the product
Sublimation works like a stamp: the design on the paper is applied in reverse onto the blank. That is why you need to mirror the image before printing.
- Canva: select all (Ctrl+A) → Flip → Flip horizontal
- Photoshop: Image → Image Rotation → Flip Canvas Horizontal
- Printer driver: check “Mirror" or “Flip Horizontal"
- Check the text: the letters must be written backward on the paper
Staining of the press platen
Symptoms:
- Ink stains on the pressed blank
- Marks/stains appear on the backs of T-shirts
- The platen has colored areas from previous prints
When the press platen is dirty with ink, some of it transfers onto the next prints. Common with sublimation on textiles (polyester, cotton).
- Use a Teflon sheet on the platen; it is the ideal barrier
- Alternatively: place a sheet of sublimation paper or normal paper
- Clean the platen weekly with isopropyl alcohol
- For T-shirts: place a sheet INSIDE the T-shirt as well (between the front and back)
Overload and electrical fluctuations
Symptoms:
- Unstable temperature during pressing
- Inconsistent results between identical prints
- The press does not reach the set temperature
- Reduces the lifespan of the press
- Pause for 10 minutes every hour of operation
- Connect the press directly into the outlet, without an extension cord
- If you use an extension cord, DO NOT connect other power-consuming appliances
- Check the mains voltage (ideally stable 220V)
- Clean the press air filter monthly (if it has one)
Ink sliding at the end of pressing
Symptoms:
- Double image or shadow on the blank
- The edges of the graphic appear “shifted”
- Colors also transfer outside the design
After removal from the press, the paper must be peeled off immediately. Any movement of the paper on the still-hot blank causes the ink to “slide.”
- Open the press at the end of the time
- Use heat-insulating gloves
- Remove the product with the paper still attached
- Peel off the paper immediately, in one single motion
- Let the product cool naturally on a flat surface
💎 Pro tips from experts
Tips collected from the workshops with the best results:
🔬 Test before the batch
Always make 1 test print before a batch. 5 minutes lost on testing saves hours of work wasted on failed blanks.
📓 Keep a parameter log
Write down the combination that worked for each blank/material. In 6 months you will have your own sublimation “bible.”
🌡️ Invest in an IR thermometer
Check the actual temperature of the platen. Many displays show a ±10–15°C difference from the actual temperature.
📦 Store the paper correctly
Place the paper in an airtight bag with silica gel. Humidity is the biggest enemy of consistent results.
⏰ Use the printer daily
Print heads clog faster if you do not use the printer. If you do not have orders, run a Nozzle Check 2 times per week (at least)
🎓 Watch tutorials
YouTube is full of sublimation tutorials. Subscribe to our channel: Green Print on YouTube
Sublimation requires practice, do not get discouraged!
If you are just starting out, it is completely normal to have inconsistent results in the first few weeks. With every print, you eliminate one more variable, and in 1–2 months you will master the full process.
For questions, write to us at office@green-print.ro or call 0728 350 300.
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