Slip sheet for CTP printing plates — low ash, controlled smoothness on both sides, and enough absorbency to take up coating solvent without marking the plate.
A CTP plate is coated and light-sensitive, so the sheet stacked against it has to be clean and dimensionally quiet. Ash content is the parameter that decides whether the plate comes out of the stack usable: this grade is held at 1.0 % or below, and typically runs far under it.
The two faces are specified separately, because the side facing the coating does different work from the side facing the aluminium. Absorbency is held at 30 g/m² or more so the sheet can take up solvent rather than trap it against the plate.
Typical applications — Slip sheet and surface protection for CTP printing plates
| Property | Typical value | Method |
|---|---|---|
| Grammage | 37 g/m², ±2 (45 g/m² also produced) | ISO 536 |
| Thickness | 0.045 – 0.055 mm | |
| Ash content | ≤ 1.0 % | |
| Moisture | 5 %, ±1 | |
| Absorbency | ≥ 30 g/m² | |
| Tensile strength MD / CD | ≥ 2.2 / ≥ 1.1 kN/m | |
| Tear strength MD / CD | ≥ 200 / ≥ 210 mN | |
| Brightness | ≥ 80 % | |
| Air permeability | 0.34 – 1.43 µm/Pa·s | |
| Smoothness, both faces | 35 s, ±20 | |
| pH | 7.0, ±1.0 |
Figures are typical values from mill technical data, not a guaranteed specification. We agree the binding specification with you before the mill runs.
Slip sheet and surface protection for ctp printing plates.
The weights we run are 37 · 38 · 40 · 42 · 45 g/m². Reel width is slit to your line; anything outside this list depends on the mill and the run, and is confirmed with the quotation.
Reels or sheets — slit to your line width.
Full technical data sheet and batch test report on request.
Send the basis weight, the reel width and the monthly volume. You get a quotation from someone who knows the mill, usually within one working day.
Tell us basis weight, reel width and monthly volume — you will get a quotation from someone who knows the mill, usually within one working day.