When direct glazing cannot reach the required brightness, supercalendering is a good method. Super calendering and laser imprint transfer adopt the same principle, i.e. using the flatness of BOPP labels ... moreWhen direct glazing cannot reach the required brightness, supercalendering is a good method. Super calendering and laser imprint transfer adopt the same principle, i.e. using the flatness of BOPP labels https://www.print-labels.net/product/plastic-labels/bopp-labels.html itself and its low surface energy characteristics, the printed gloss oil is compounded with BOPP labels by using a cold ironing device, then cured, and then the BOPP labels is rewound and collected by using the winding system of the cold ironing device for next reuse.
Since the surface energy of the BOPP labels is only 32 dynes, varnish cannot be attached to BOPP labels at all. However, as it is compounded with the flat BOPP labels and cured with a UV lamp, the cured gloss oil surface is as flat and glossy as the BOPP labels.
The precautions of BOPP supercalender are similar to those of cold ironing. However, since the BOPP labels are made of transparent material, the front and back sides need to be marked correctly to prevent the... less