Palram PALSU - Manual (Page 36)

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Printing
PALSUN is suitable for all printing methods which are applicable to rigid sheets. It has been tested and approved by leading digital
printer manufacturers, achieving excellent results in all parameters. Clear PALSUN sheets match the high clarity of other thermoplastic
sheets, yet offer far better adhesion properties and ease of printing with no requirement for any further surface treatment.
Direct Digital Printing
Wide format (Roll-to-roll) and flatbed printers use various ink and ink curing technologies to allow high quality printing at relatively
high speeds. High quality digital printing depends on various factors:
ƒ Printer capabilities
ƒ Ink technology and quality
ƒ Type of printing substrate and quality
ƒ Machine operator
PALSUN is suitable for use with UV curing and solvent-based digital inks, and for IR drying when water-based inks are used. PALSUN
will retain its clarity or tint, even after intense UV curing.
Protective Film Masking
The protective polyethylene film mask helps prevent surface abrasion and stains. However, removing the protective film may cause
an increase of static electric charge, which can affect ink coverage. Therefore, after peeling the film away from the sheet, the static
electricity that has built up in the sheet should be discharged using an ionized gun or a suitable device provided by the printer
manufacturer.
Cleaning PALSUN® and Preparing for Printing
The surface should be clean before printing. Carefully inspect each panel to ensure there is no: dust, fingerprints, residue or other
problematic substances that may affect ink coverage or adhesion. If needed, the PALSUN should be cleaned with a damp rag, or
with isopropyl alcohol.
Ink Adhesion
PALSUN is suitable for all types of inks: aqueous, solvent based, and UV curable. This suitability is affirmed by major printer OEM’s,
including HP, AGFA, Océ, Gandy Digital, Mutoh, and more. For compatibility information and recommendations, please consult the
printer manual or contact the printer manufacturer.
Ink Drying
There are two main technologies used for ink drying in digital printing:
IR (Infrared) – PALSUN’s short and long term service temperatures are 120°C and 100°C respectively, which make it highly suitable
for printers with IR drying tunnels.
UV (Ultraviolet) – PALSUN is immune to long term UV exposure and is suitable for UV curing.
Print Head Adjustment
The distance between the print head and the substrate can have a significant affect on print quality. Manufacturer specifications,
combined with operator experience, should determine print head distance from the substrate.
The suggested starting distance should not be more than 2 mm from the print head to the substrate.