Offset Printing: Delivery Conditions
The surface of YUPO is highly smooth and sheets may stick easily to each other. In addition, YUPO is non-absorbent. It can therefore take time for the ink to set and problems with set-off can occur easily.
In order to prevent set-off, please take note of the following points.
Use of a Spray Powder
The objective of spray powder is to prevent sheets from sticking together and to allow them to take in oxygen. Therefore, rougher powders are more effective. In order not to damage the appearance of your printed materials, the use of the following sizes and quantities is recommended:
<For FGS>
- Particle Diameter
- 15 to 30 µm
- Amount Sprayed
- 50 to 100% more than for coated paper as a guide
Example) NIKKALYCO (Mini-Pack SL or AS160)/Nikka Ltd. (Tokyo, Japan)
In addition, when making multiple printings on the same paper, or doing laminating, please remove excess spray powder by performing "powder removal."
Pile-Board Insertion
Ensure that you insert a pile board. The height of the pile board will depend on the grade and pattern.
Use the following as a guide:
| First printing side | Rear side | |
|---|---|---|
| General YUPO (FGS)*1 |
10 cm or less | 10 cm or less |
| SUPERYUPO (FRB [G])*2 |
Approx. 20 cm | - |
| ULTRAYUPO (FEB [G]/FBEA)*1 |
Approx. 10cm | Approx. 10cm |
- *1 In the case of YUPO ink
- *2 In the case of general-paper inks
Paper Output Fan
Please adjust your printer so that the printed sheet of YUPO gently falls on to the pile.
In order to prevent off-set problems, set the sheet pressure air to zero, or as low as possible.
Side Jogger
Adjust the position of the side jogger so that the left and right sides touch the sheets of YUPO evenly.
Set it so that it lightly touches the sheets of YUPO and ensure that it does not hit them strongly.
Static Removal
Static electricity can make sheets of YUPO stack imperfectly or cause off-set. The best prevention method is to maintain high humidity of at least 50%. Ensure that the static remover is set to on. Use of an air ionizer is also effective (for UV printing, a static removal device is required).
Use of a static removal cloth or rope is also effective. Please attach them firmly when installing so that they do not come off.
Other
Until the ink has completely set, please make absolutely certain that you do not apply pressure or in any way disturb the YUPO. If you must move printed sheets of YUPO to make space, take care not to disturb the paper or cause it to fall over.