Most pressing problems get blamed on the transfer or the press. Often the real variable changed somewhere else entirely: the blank. Two shirts that both say one hundred percent cotton on the label can behave noticeably differently under a platen, and the moment you add rayon or polyester the rules shift again.
Here is what the terminology on a blank actually means and how each type behaves when you press it.
Decoding the Terminology
Carded open-end cotton is the standard basic tee. The yarn is spun quickly and less uniformly, producing a thicker, slightly coarser fabric. It is the cheapest option and the workhorse of event and giveaway shirts.
Ring-spun cotton is spun with a process that twists and thins the fibers, creating a finer, smoother, stronger yarn. Combed ring-spun adds a step that removes short fibers, producing an even smoother surface. These are your retail-feeling blanks.
Tri-blend combines cotton, polyester, and rayon. The rayon is what gives it that very soft, slightly slinky drape and heathered look.
Heavyweight generally means six ounces per square yard or more, versus roughly four to five for a standard tee.
Garment-dyed or pigment-dyed means the shirt was sewn first and dyed afterward, which produces soft, slightly uneven vintage color.
Press Reference by Blank Type
| Blank type | Temperature | Time | Pressure | What to watch |
|---|---|---|---|---|
| Carded open-end cotton | 300–320°F | 10–15 sec | Medium-firm | Most forgiving. Coarser surface softens fine detail. |
| Ring-spun / combed cotton | 300–315°F | 10–14 sec | Medium-firm | Smoother surface holds fine detail well. |
| Heavyweight cotton (6 oz+) | 305–320°F | 15–18 sec | Firm | Needs a longer dwell for heat to reach the adhesive. |
| Garment-dyed / pigment-dyed | 290–305°F | 10–12 sec | Medium | Loose surface dye can transfer. Use fresh cover sheets. |
| 50/50 cotton-poly | 290–305°F | 10–12 sec | Medium | Dye migration risk on dark colors. |
| Tri-blend | 280–295°F | 8–10 sec | Medium-light | Rayon scorches and glazes easily. Peel cool. |
| 100% performance polyester | 270–285°F | 8–10 sec | Medium | Highest migration risk. Cold peel. |
These are starting points. Confirm your film’s range with your supplier and always defer to the garment’s own care tag when the two conflict.
Basic Cotton: Forgiving but Textured
A carded open-end tee will tolerate more heat, more time, and more pressure than almost anything else you press. That is why it is the right blank for learning on and for high-volume event work.
The trade-off is surface texture. The thicker, less uniform yarn means very fine lines and small text sink slightly into the weave and lose crispness. If a design depends on hairline detail, this is not the blank for it.
Ring-Spun: The Sweet Spot for Retail
Combed ring-spun cotton is where most shops should be for anything a customer will wear by choice rather than obligation. The smoother surface gives noticeably sharper edges on fine detail, and the softer hand means a large print feels less intrusive.
Press it slightly cooler than a basic tee. The finer yarn conducts heat a little more efficiently, and the smoother surface shows any scorching or sheen more readily.
Tri-Blend: Soft, Popular, and the Most Likely to Burn
Tri-blends are the blank most customers love and most shops mishandle. The rayon content is the problem. Rayon has a lower heat tolerance than either cotton or polyester and will scorch, glaze, or develop a permanent shine at temperatures a cotton tee would not notice.
Go cooler and shorter. Use medium-light pressure rather than firm. Use a cover sheet larger than your platen, and let the garment cool before peeling. If you are seeing a shiny rectangle on tri-blends, temperature is almost always the culprit, and dropping twenty degrees usually solves it. Our guide to fabric compatibility for DTF transfers covers the broader picture.
The heathered look of a tri-blend also affects appearance. The fabric is not a solid color, so a print with a lot of white or light ink will read slightly differently than it does on a solid tee.
Blends and the Dye Migration Question
Any blank with meaningful polyester content on a dark color carries dye migration risk, where the garment’s dye sublimates under heat and tints your print from underneath. It typically appears as a pink or discolored haze inside white ink, and it can show up hours or days after pressing rather than immediately.
Lower temperature, shorter dwell, and letting the garment cool fully before stacking all reduce the risk. Our guide to what dye migration is and how to prevent it covers the mechanism in full, and for full polyester blanks specifically, see using a DTF transfer on 100% polyester.
Heavyweight: Just Add Time
Heavyweight tees are not difficult, they are simply slower. More material means heat takes longer to reach the adhesive layer. Add three to five seconds over your standard cotton recipe and keep pressure firm.
Heavyweight blanks are increasingly popular for streetwear-style oversized prints because they carry a large graphic without feeling flimsy.
Garment-Dyed: Watch for Crocking
Pigment-dyed blanks have color sitting on the surface of the fibers rather than fully penetrating them. That is what creates the soft, faded look, and it also means some of that color can rub or transfer under heat and pressure.
Use a fresh cover sheet for each garment rather than reusing one across a run, and wipe your platen between pieces. Also warn customers that these blanks fade with washing by design, which is a feature rather than a defect, but it needs to be said in advance.
Performance Fabrics
Moisture-wicking and athletic blanks are their own category, with tight synthetic knits, sometimes a surface treatment, and high migration risk. Our guide to custom gym wear and activewear with DTF transfers covers what works and what does not.
Test Every New Blank Before You Commit
Whenever you change blank brand, style, or fabric content, treat it as a new combination and test it before running a customer order. Press a sample, wash it several times, and confirm the settings hold. The shirt is a variable in your process, not a neutral surface.
What to Stock
Most shops do well with three blanks: a basic carded cotton for volume and giveaway work, a combed ring-spun for retail and everyday orders, and a heavyweight for premium and oversized prints. Add tri-blends only when the customer specifically wants that hand feel and you have tested your settings, and treat performance polyester as a special order rather than a stock item.
The blank is not a neutral background. It changes your temperature, your dwell time, your pressure, and how your design reads. Learn how the few blanks you actually sell behave, write your settings down for each one, and most of the mystery goes out of pressing. Ready to run your next job? Order your DTF transfers from Southeast Prints.