by clicking the arrows at the side of the page, or by using the toolbar.
by clicking anywhere on the page.
by dragging the page around when zoomed in.
by clicking anywhere on the page when zoomed in.
web sites or send emails by clicking on hyperlinks.
Email this page to a friend
Search this issue
Index - jump to page or section
Archive - view past issues
FLEXO Magazine : November 2010
Figure 1 shows the effect of the dot shoulder profile and dot diameter using common plate exposure techniques (analogue, digital and digital nyloflex® NExT). Since analogue plates are exposed in a vacuum, almost free from oxygen, the entire tonal range is produced with flat- top dots. However, they also have a higher quantity of shoulder growth and dot gain from the negative to plate, due to the light scattering caused by the UV light passing through the film negative, vacuum coversheet and the plate release layer. Since a digital plate is exposed in the presence of oxygen, sharper images and a dot reduction are the result. Dot shapes, especially in the highlight region, have a more rounded, non-flat top surface. The third diagram shows the ability of the high output UV light source of nyloflex® NExT to quickly crosslink the plate surface of standard digital plates under ambient conditions and to obtain virtually a 1-1 copy of the dot size from mask to plate without creating excessive shoulder growth or dot gain. Another advantage of removing the image sharpening influ- ence of the oxygen is to better control the size of the image opening used for surface screening. Oxygen can play a major role in determining the minimum cell or groove dimensions pos- sible on a plate. Figure 2 demonstrates how the flat-top dot ap- proach closely matches the dot/cell size of the mask, while the cell size of the digital plate increases in size. Numerous flat-top dot press trials have shown dramatic improvement in both print- ing smooth solids, as well as increasing the solid ink density. It appears that the nyloflex® NExT exposure technology has also print advantages on press with improvements in impres- sion latitude and a reduction to gear streaks. These advantages are created by the flat-top dot shape and shoulder angle ability to reduce dot growth, while under impression, as well as a higher level of intermediate depth between the rows of dots. This dot shape has also been helpful in reducing the quantity of fluting when using digital plates in the corrugated industry. The nyloflex® NExT Process The only change required with nyloflex® NExT process is the addition of an advanced high energy UV light source allowing surface crosslinking under ambient conditions. The high energy UV irradiation can be combined with standard UV tube light to complete the through cure of the image to the plate’s floor efficiently. Polymerization through the high output UV source happens at such a fast rate that the oxygen does not have time to slow down the crosslinking process. Subsequently a virtual 1-1 reproduc- tion from the image on the LAMS layer is accomplished. This 1-1 reproduction can be seen on the micropho- tographs displaying the pixel structures on the image edges and the slight surface texture. The nyloflex® NExT process offers advan- tages over existing competitive flat top dot approaches along with benefits over standard digital platemaking - without the need of expensive consumables and additions to standard platemaking workflows. However, in many instances, using standard non-flat top digital plates exposed with regular tube light exposure still yield exceptional print quality in many jobs. Figure 2 • copes with all requirements – starting from print on rough and uneven substrates to pressure sensitive and soft paper substrates • outstanding with challenging and multi-color designs • very good ink transfer with excellent area coverage and high solid density • perfect adaption to corrugated board structure that reduces the washboard effect • easy and safe processing due to a wide exposure latitude and color change • very good intermediate depths • less plate cleaning due to special surface properties • extremely robust and durable material ▫ high print run stability ▫ less mechanical wear ▫ low swelling characteristic ▫ high resistance to ozone ▫ excellent storage capability Product features nyloflex® FAC nyloflex® FAC Digital Just brilliant – high-performance in corrugated (postprint) Advantages of nyloflex® Digital • superior printing quality with sharper images, more open intermediate depths, finer highlight dots and less dot gain, i.e. larger range of tonal values, therefore improved contrast • increased productivity and data transfer without loss of quality due to digital workflow • consistency in quality when repeating plate processing • cost effective and more environmentally friendly in processing, as no film is required fall conference edition FLX_Nov10_mech.indd 34 11/1/10 2:23 PM
Sustainable Fall 2010