Screen printing
on paper

Why paper behaves differently

Everything that limits halftones on a t-shirt is a property of the fabric, not of screen printing. Take the fabric away and the limits move.

No weave to lose dots in. On textile, ink has to sit on top of a knitted surface with visible loops. A small dot lands partly in a valley and disappears. Paper is flat, so a dot that survives the screen also survives the print.

Almost no dot gain. Fabric absorbs ink and lets it wick sideways along the fibres, which is why a 50% dot on a shirt prints closer to 60 or 65%. Coated paper absorbs very little, so gain drops to a few percent. Your midtones stay where you put them.

Thinner ink films. Poster inks are formulated to sit thin and flat rather than to build opacity over a coloured background. A thinner deposit spreads less, which again protects small detail.

No stretch. Paper does not deform on the press, so registration between colours holds much tighter. Tight registration is what makes overprinting and fine trapping practical.

Mesh and line frequency for paper

The same rule applies as on textile — a dot has to span roughly two thread pitches (about three openings) — but because paper lets you work on much finer mesh, the numbers land somewhere else entirely.

Dot sizes are given in millimetres with the inch equivalent in brackets; the tool itself works in either unit. Compare this with the textile chart, where 230 mesh tops out around 48 LPI. Same mesh, higher frequency — because paper is not going to eat the fine end the way a knit does.

The tonal range you actually gain

On a shirt, roughly the first and last tenth of the tonal scale is unusable: highlights fall through the mesh, shadows bridge and fill in. On paper both ends open up.

Practically, that means a gradient can fade closer to nothing before it stops, and dark areas hold detail instead of collapsing into a flat solid. It is the difference between a poster that looks printed and one that looks photocopied.

It also means the clipping settings that protect you on textile are unnecessarily cautious for paper. If your tool clips at 12–88% by default, you are throwing away range that paper would have printed.

Ink and stock decide more than the mesh

Coated versus uncoated

Coated and smooth uncoated stocks hold halftones beautifully. Rough, heavily textured or handmade papers behave a little more like fabric: the surface irregularity breaks up small dots. On a heavily textured stock, drop back to 230 mesh and a lower frequency, or reconsider whether the design needs halftones at all.

Water-based versus solvent and UV

Water-based poster inks are the common choice for paper and behave well, but they dry in the screen faster than plastisol does on textile. With fine halftones the risk is real: a partially dried screen loses its smallest dots mid-run, and the effect creeps in gradually so you may not notice until you compare the last print to the first. Keep the run moving, and flood the screen between pulls.

Ink thinning

Over-thinned ink spreads on paper and closes up shadow dots. If your dark tones are filling in but your exposure is right, look at the ink before the screen.

Drying and stacking

Paper cannot go through a textile dryer. Prints need drying racks and air, and a poster edition of 100 in four colours needs rack space for 100 sheets per pass — print one colour across the whole edition, let it dry and stack it, then run the next, not 400 sheets at once. This is the practical bottleneck that catches people moving from shirts to paper: not the printing, the drying.

Do not stack wet prints. Beyond the obvious offsetting, the pressure flattens the ink film and dulls the finish unevenly.

Registration on paper

With no stretch to fight, registration can be tight enough that overprinting becomes a design tool rather than a hazard. Two transparent inks overlapping give you a third colour for free — the classic poster trick of getting six apparent colours out of three screens.

Set up a paper stop or a registration jig on the press bed so every sheet lands in the same place. On textile the platen does this for you; on paper it is your job, and it is the single biggest determinant of whether your colours line up.

Making the films

The film side of the job is identical in kind, different in numbers. You still need 1-bit films, pure black and white, printed at 100% scale with enough density that no UV passes through the black. What changes is the line frequency you screen at, and the fact that you can afford a wider tonal range.

• Choose the mesh you will actually print with, then let the frequency follow from the table above.
• Consider 720 dpi output for fine work. At 65 LPI a 360 dpi film gives roughly 32 grey levels, which can band visibly in a smooth gradient. At 720 dpi the same screen gives around 124 levels.
• Keep the angle off the weave. 22.5° stays clear of 0°, 45° and 90° on paper exactly as it does on textile.
• Mirror for emulsion-down as usual, and print the film at actual size.

If you are moving between shirt work and poster work, the setting to remember to change is the mesh. Everything else follows from it.

Quick comparison

Common questions

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