Printing on Polyart

Polyart is a silk coated synthetic substrate. It has a coating on it similar to that of most Silk/Matt coated papers and is suitable for most printing processes. Litho printers should handle and print it as a Silk/Matt coated material.

Lithographic printing

Printing
Normal inks for Silk/Matt coated materials that dry by oxidation/penetration and inks which are mineral oil free are suitable for simple line and tone work. Where close register multi-colour work is involved, the use of standard inks may give rise to unacceptable print distortion, especially on the lower weights of Polyart. In these cases it is recommended that special inks that are essentially free of mineral oils and dry entirely by oxidation are used. Some slight distortion is almost unavoidable with heavy ink weights. Best results for multi-colour work are obtained with a single pass through multi-colour presses. Aqueous coatings provide excellent results. When printed Polyart is required to withstand long-term daylight exposure, light-fast inks must be used.

Damping
This should be reduced and maintained at the lowest possible level with the pH no lower than 5.5. The use of the cobalt acetate drying additive can be an advantage; excess fount will retard or prevent the ink drying. Other fount additives can be used but these should be reduced to 50% of the manufacturer’s recommendations. The printing of Polyart on small offset machines which incorporate an integrated damping system is not recommended.

Spray powder
Always use a non-vanishing spray powder with a minimum particle size of 20 microns.

Stack heights
These should be reduced to allow for the ink oxidation process to occur.

Varnishing
Care should be taken to allow varnish to dry to a hard finish. If using and aqueous coating on both sides of the sheet, it is recommended that a coating suitable for double sided working is used. Where Polyart has been pre-printed prior to UV varnish being applied, it is very important to remove all anti set off spray powder to prevent speckling in the finished UV varnish. Where non UV inks are to be varnished, the inks should be wax free to prevent bleed. To prevent material distortion from UV sources, minimal power should be used to cure the varnish.

UV Litho printing
UV cured inks and varnishes print satisfactory, but check with your ink supplier to confirm compatibility. Control the temperature of the lamps to avoid overheating and distortion.

Screen printing
Using a fine mesh screen and light ink films gives the best results; avoid overheating when drying. Aromatic solvent thinners may distort the surface, so should be avoided. It is best to contact your ink supplier for suitable ink.

Finishing and subsequent processes

Folding
Polyart can be folded like paper of a similar bulk on normal folding machines. The folds may be slightly springy.

Guillotining
It is recommended that 48 hours is allowed after printing before cutting. Light clamping pressure should be used otherwise slight sticking on the edges may occur. This can be alleviated by fanning or breaking.

Punching, drilling and perforating
Tools must be sharp and the dwell times kept short to avoid fusing of the material from the heat generated. As Polyart is stronger than conventional paper, large tie area is not required when perforating.

Adhesives
Water based and hot melt adhesives can be used. It is always best to advise your supplier that it is to be used with Polyart. Some solvent adhesives can be used after consultation with your supplier.

Other printing processes
Flexo, Gravure, Thermal Transfer and Inkjet printing are all possible on Polyart.
Never laser print onto Polyart, as the heat will cause the paper to melt and damage the printing machine.

Polyart is…

Durable
UV resistant
Safe for direct food contact
Grease resistant
Chemical resistant
Water resistant
Temperature resistant Cold (- 60○C) – Outdoor weather resistant
Tear resistant
Recyclable
Suitable for pen or
pencil writing
Light resistant


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