{"id":30650,"date":"2016-09-08T09:31:48","date_gmt":"2016-09-08T07:31:48","guid":{"rendered":"http:\/\/www.metaprintart.club\/uncategorized\/30650-led-uv-in-speed-test\/"},"modified":"2016-09-08T09:31:48","modified_gmt":"2016-09-08T07:31:48","slug":"led-uv-in-speed-test","status":"publish","type":"post","link":"https:\/\/www.metaprintart.info\/en\/international-en\/30650-led-uv-in-speed-test\/","title":{"rendered":"LED UV in speed test"},"content":{"rendered":"

IST METZ examines the performance of LED UV technology with tests on a newspaper press.<\/h2>\n

by Klemens Ehrlitzer<\/em><\/p>\n

Race tracks provide ideal conditions for testing potential speeds. In a similar way, newspaper printing presses are the \u201crace tracks of the printing industry<\/em>\u201d. This is why UV supplier IST METZ used a Wifag OF-7<\/em> to test out the performance of LED UV technology. The press is located in the production hall of Swiss company Centre d’impression et d’arts graphiques Pressor SA and is equipped with UV curing. This article includes information about the conditions and results of the tests and about the knowledge gained as a consequence.
\nThe increasingly widespread nature of LED UV technology in various graphical applications is now piquing interest even in places where this alternative to classic UV curing has barely been used to date. Operators of fast-running web presses looking at investing in LED UV technology are especially keen to know exactly how a high-performance setup needs to be designed. \u201cAn ideal response to this question is resilient information about what printing speeds can actually be achieved in the field using an LED UV system as a function of the combination of printing ink and substrate<\/em>\u201d, explains Stefan Feil, IST METZ specialist.<\/p>\n

Technical Marketing<\/h1>\n

Experience with web printing applications comes primarily from narrow-web label printing to date. In this case, maximum press speed rarely exceeds a value of 200 m\/min. There was a general assumption that current performance is significantly higher, but there was no practical proof of this. IST METZ saw an opportunity to examine this question in newspaper printing. Centre d’impression et d’arts graphiques Pressor SA<\/em> (Pressor for short) is a customer of the N\u00fcrtingen company and has a printing press equipped with UV technology. The D\u00e9lemont company produces the regional newspaper Le Quotidien Jurassien<\/em> and the weekly newspaper La Gazette de la region<\/em> for publishers Editions D+P SA on this newspaper press, a Wifag OF-7<\/em> with a web width of 1300 mm and a section length of 940 mm.
\nWhen the press was installed in 2007, the UV equipment originally consisted of BLK-3-type<\/em> UV systems from IST Metz. With the rise in the low-energy variant of UV printing, Pressor switched to so-called LE UV technology, in which appropriately-adapted printing inks are used in addition to specially-doped UV lamps. The simultaneous benefit of this switch was that it was possible to reduce the previous number of three UV units for each side of the web to just one UV unit.<\/p>\n

One UV module<\/h1>\n

For the tests, one of the two LE UV radiators was replaced with an LED cure system of the LUV 80 type. The choice was a deliberate decision, even though the gap between the radiators and the substrate is 50 mm on this model. In contrast, the more important issue was that the energy is focussed on the web by means of the special arrangement of the LEDs in a line.
\nThis accordingly provided separate UV units for the front and back, simultaneously allowing a comparison between low-energy UV and LED UV technology to be made.
\nWith systems from IST METZ, the interchange between different UV technologies is very simple by means of the Hot Swap<\/em> concept. Last autumn at Labelexpo Europe, the company presented the new product concept for the first time. Since it is suitable for sheetfed, web and narrow web printing alike, the drupa 2016 presence also focused on the concept. With the Hot Swap concept, the UV units can be used interchangeably. A simple change from a LAMPcure to a LEDcure system and vice versa is possible. The peripheral equipment in the machine remains, a joint electrical supply is used.<\/p>\n

Speed incrementally increased<\/h1>\n

During the test series with LED UV technology, the maximum mechanical speed of the machine was approached incrementally. This speed is 35,000 revolutions\/hour, which means a web speed of 9.14 m\/s (548 m\/min). Start speed was 8,000 revolutions\/hour and was increased by 4,000 revolutions\/hour after every test. The final test series was the one at 32,000 revolutions\/hour \u2013 a production speed which Pressor frequently achieves in practice. This corresponds to a web speed of 500 m\/min.
\nUV curing is affected by a variety of parameters of which the UV system is just one. Other important factors are the material for printing and the printing ink. The obvious choice for a newspaper press was a common 45 gsm newsprint paper. A 70 gsm matt-coated paper quality was tested as a second substrate; this has a more closed surface and thus reduced ink absorption properties.
\nFor printing inks, Pressor uses UV printing inks from hubergroup designed for fast-running newspaper printing presses. At Drupa, this printing inks manufacturer will be presenting a new range of inks for this application, developed especially for the use of LED UV technology. The trials were performed with \u201cadvance samples\u201d of the four-colour process inks from this new product family.<\/p>\n

\"IST<\/a>
\nTable: Test results for LED UV curing at different speeds on the respective paper quality.<\/em><\/p>\n

 <\/p>\n

 <\/p>\n


\nIn summary<\/strong>, the table shows that curing of the inks when printing on newsprint paper was good across all the speeds tested. In this case, density values of 0.90 were specified as colour density for yellow, magenta and cyan, with 1.10 specified for black. The test results suggest that with an absorbent paper and low print densities, good curing results may also be achievable beyond the maximum speed of 500 m\/min tested.<\/p>\n

\"Figure<\/a>

Results of LED UV curing on newsprint paper<\/em><\/p><\/div>\n

When printing on absorbent paper qualities, the good depth-curing properties of LED UV curing deliver an additional benefit, as ink which has been absorbed into the paper is reached better than by classic UV radiators. In analogy to classic UV curing, black ink also represents a bigger challenge than the colours when LED UV radiators are used. The cause is the same for both types of ink – black pigments absorb more energy from the UV spectrum than colour pigments, so this energy is then unavailable for initiating polymerization.<\/p>\n

Limits with coated papers and higher ink density
\n<\/strong><\/p>\n

\"Results<\/a>

Results of LED UV curing on matt-coated paper quality<\/em><\/p><\/div>\n

Colour densities for the tests using matt-coated paper were at values of 1.30 for yellow, magenta and cyan and 1.50 for black. Initial signs of incomplete curing were found in the black range, in particular, from a press speed of 28,000 revolutions\/hour if assessment followed immediately after printing. In spite of this, it was possible to process the paper web to an acceptable quality in the folding unit. If the result was rated after 24 hours, results at 438 m\/min and 500 m\/min once again showed good curing.
\nIn summary: LED UV suitable for high printing speeds<\/strong>
\nOverall, IST METZ can draw informative conclusions about the current state of the art in LED UV curing from the test results outlined. One is that when printing using LED UV inks, high production rates can now be achieved. Surface speeds such as those usually achieved on presses for narrow-web label printing or in sheet-fed offset printing, were exceeded by a significant margin in the test runs on the newspaper press. To guarantee reliable curing, however, it should be ensured in cases which require it that an appropriately-modified speed is selected as a function of the substrate used and of ink density – especially when black ink is involved.<\/p>\n","protected":false},"excerpt":{"rendered":"

IST METZ examines the performance of LED UV technology with tests on a newspaper press.<\/p>\n","protected":false},"author":2,"featured_media":27757,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7731],"tags":[7941,7942],"class_list":["post-30650","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-international-en","tag-led-uv-cure-en","tag-newspaper-press-en"],"yoast_head":"\nLED UV in speed test - MetaPrintArt<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.metaprintart.info\/international\/17831-led-uv-in-speed-test\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LED UV in speed test - MetaPrintArt\" \/>\n<meta property=\"og:description\" content=\"IST METZ examines the performance of LED UV technology with tests on a newspaper press.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.metaprintart.info\/international\/17831-led-uv-in-speed-test\/\" \/>\n<meta property=\"og:site_name\" content=\"MetaPrintArt\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/MetaPrintArt\" \/>\n<meta property=\"article:published_time\" content=\"2016-09-08T07:31:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.metaprintart.info\/wp-content\/uploads\/2016\/09\/pressor_ist-metz_01_led-test.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"960\" \/>\n\t<meta property=\"og:image:height\" content=\"750\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Marco F. 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Nel 2010 \u00e8 docente a contratto di Tecnologie di Stampa al Politecnico di Torino. Parallelamente all\u2019attivit\u00e0 giornalistica, si dedica alla scrittura. Debutta nel 1998 con il romanzo La Tunelo, in lingua Esperanto, premiato dalla rivista svizzera Literatura Foiro come Verko de la Jaro 1999. La versione italiana, con l\u2019editing e la prefazione di Wilma Coero Borga, \u00e8 in attesa di pubblicazione. Nel 2020 pubblica Il Segreto dei Dieci Laghi (DiMarsico Libri Editore), un romanzo ambientato sulle Ande, dedicato alla cultura Inca e all\u2019alfabeto dei nodi. Nel 2021, in self-publishing, esce I Cavalieri Astrali, scritto con Stefano Gatti (Stegat), una raccolta di quattro racconti iperdeterministici con un intermezzo quantistico curato da un professore universitario di fisica quantistica. Nel 2022 pubblica Un cerchio di stelle, basato sul diario di viaggio scritto nel 1960 durante un\u2019avventura in autostop alla scoperta dell\u2019Europa nascente. Nell\u2019aprile 2024, per De Ferrari Editore, esce I Briganti del Vigoleno, una fiaba per adulti o un racconto per ragazzi, scritto a quattro mani con Wilma Coero Borga. Nel tempo libero alterna la lettura al trekking e al gioco degli scacchi di cui \u00e8 istruttore di primo grado.","url":"https:\/\/www.metaprintart.info\/en\/author\/marco\/"}]}},"views":1328,"_links":{"self":[{"href":"https:\/\/www.metaprintart.info\/en\/wp-json\/wp\/v2\/posts\/30650"}],"collection":[{"href":"https:\/\/www.metaprintart.info\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.metaprintart.info\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.metaprintart.info\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.metaprintart.info\/en\/wp-json\/wp\/v2\/comments?post=30650"}],"version-history":[{"count":0,"href":"https:\/\/www.metaprintart.info\/en\/wp-json\/wp\/v2\/posts\/30650\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.metaprintart.info\/en\/wp-json\/wp\/v2\/media\/27757"}],"wp:attachment":[{"href":"https:\/\/www.metaprintart.info\/en\/wp-json\/wp\/v2\/media?parent=30650"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.metaprintart.info\/en\/wp-json\/wp\/v2\/categories?post=30650"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.metaprintart.info\/en\/wp-json\/wp\/v2\/tags?post=30650"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}