Uncoated stock is where most foil complaints originate. The material is absorbent, irregular and often heavily textured, so the parameters that give a perfect result on coated board produce a broken, pinholed image here.
Why uncoated behaves differently
A coated sheet presents a sealed, flat clay layer. An uncoated sheet presents fibre: it draws heat out of the die faster, compresses under pressure, and has a surface profile that can be tens of microns deep on laid or felt-marked stock. The foil has to be soft enough to deform into that profile within the dwell time available.
This is why letterpress-style deep impression and foil work well together — the press is already driving the die into the sheet, which brings the foil into contact with the valleys as well as the peaks.
| Stock | Temperature | Dwell | Counter |
|---|---|---|---|
| Smooth uncoated / offset | 105–120 °C | 0.3–0.4 s | Hard |
| Laid / felt-marked | 100–115 °C | 0.4–0.5 s | Hard or semi-firm |
| Cotton / high bulk | 95–110 °C | 0.4–0.6 s | Semi-firm |
| Heavy embossed texture | 95–110 °C | 0.5–0.8 s | Rubber-faced |
Fixing pinholing and broken solids
- Switch to a soft-release grade before changing anything on press — this alone resolves most pinholing on textured stock.
- Increase dwell rather than temperature: fibre scorches and yellows before the foil improves.
- Add pressure in small increments; deep-texture stock can take far more than coated board without crushing.
- Break large solids into a texture or outline where the design allows — a 100 % solid on cotton paper is the hardest thing to hold.
- Keep the die clean: fibre debris builds up faster on uncoated stock and shows as speckling within a few hundred impressions.
MOQ and lead time by product
Minimum order quantity and production lead time for the products used in this industry. Each row links straight to the product page with full specifications.
| Product | MOQ | Lead time |
|---|---|---|
| Premium Metallic Gold Hot Stamping Foil | 50 kg | 15–20 days |
| Matte Silver Hot Stamping Foil | 50 kg | 15–20 days |
| TYM-1060 Embossing Machine | 1 set | 30–45 days |
Frequently asked questions
Why does foil look speckled on uncoated paper?
- The foil is bridging the surface texture and only touching the high points. Use a soft-release foil grade formulated for uncoated stock, extend dwell to 0.4–0.6 s, and increase pressure before you increase temperature.
What temperature suits cotton and fine art papers?
- 95–110 °C. These stocks scorch and yellow at temperatures that coated board tolerates easily, so recover density with longer dwell and higher pressure rather than more heat.
Do I need a different die for textured stock?
- The die material can stay the same, but detail should be coarser. Very fine hairlines cannot survive being pressed into a deep texture, so thicken strokes slightly at artwork stage and consider a rubber-faced counter on the deepest stocks.
Can foil be applied to recycled uncoated board?
- Yes, with a soft-release grade. Recycled stock contains more fibre debris and has a more variable surface, so expect more frequent die cleaning and slightly wider parameter tolerance than on virgin uncoated stock.
Which foil should I order for uncoated stationery work?
- A soft-release metallic or pigment grade specified for uncoated and textured paper. Send a sheet of your actual stock with the enquiry — texture depth changes the recommendation more than colour or weight does.