The Miyakoshi semi-rotary offset press at Provin’s demo center
At the Provin stand at the concluding Printpack exhibition at the showtime of 2019, the web-fed Miyakoshi hybrid flexo and offset characterization press was shown. Subsequently, the printing was installed in the demo middle at Provin's part in the Okhla industrial area in Southward Delhi for demonstrations and training purposes. Since information technology is a relatively novel technology and concept, it fabricated sense to invest in a local sit-in and training eye for the intermittent get-go and flexo hybrid label press.
Although I call information technology novel, the concept is not entirely new. We take seen Chinese made cease-and-start or intermittent web-fed offset presses at label shows, including the Labelexpo Republic of india at Pragati Maidan nigh a decade ago. However, although label converters have recognized the ease of making high-resolution and speedier first prepress and plates at lower costs, they take often been disappointed past the eventual throughput of some of the intermittent label presses purchased and installed.
The central to offset reproduction is in the feeding
Every bit a sheetfed and web first printer and trainer, I take generally tried to explain (to those press operators who would listen) that the key to quality reproduction, whether on a sheetfed or webfed offset press, is in the feeding. If the feeding is not steady and if the motion through the press is non smooth and the delivery struggles, or in the case of webs create the right pull, the reproduction and the ink-h2o rest cannot be maintained fairly. You lot volition find upward either with weak printing or too much ink or misregister, leading to mud on the substrate and many other reproduction errors and artifacts.
At that place are actress problems for maintaining equilibrium in the system on a characterization press, especially one that allows varying impress lengths without irresolute any cylinders. The get-go is the need to print on pressure level-sensitive label stocks, including flick substrates or face up stocks, since they are non-absorbent for the curing or drying of ink. And the second is the problem of the back and forth movement of the labelstock web, which allows the use of diverse impress lengths without changing cylinders (chosen tooling). A tertiary possible problem would be the rotary die-cutting unit of measurement that could stress the starting time ink transfer if it resulted in any tension modify as the substrate moves through each press unit.
The solution to the first problem of printing on film confront stock is quite ordinary and elementary – the use of UV inks and, in Provin's Miyakoshi press, using a Multiwave LED UV curing system. This is a typical method and allows the use of UV inks commonly used for outset cartons since they are are tolerant of dampening solutions. The Multiwave LED curing system used on the Miyakoshi at Provin means that the lamp tin can cure both conventional and LED UV inks. The LED variable radiation lamp has a longer life and does not crave elaborate chilling and apportionment for cooling. (The two flexo units on the press use conventional UV.)
The solution to both the infeed and out-feed problem and the back and along motion of the web to compensate for varying run lengths with aforementioned circumference cylinders is Miyakoshi's ingenious air-driven loop. Before the take-up reel, in that location is ane air-driven loop before the first press unit and another air-driven loop at the end of the press. There is a web tensioning unit of measurement too after the infeed air loop.
The infinitely variable loop is created past air force per unit area, and it shrinks and lengthens every bit the web moves dorsum and forth in the printing units to recoup for the longer and shorter print lengths on the standard-sized get-go plate. To a person who admires stream feeders and has seen many kinds of splicers and festoons on web in-feeds, this is an ingenious feat of automation, worthy of a tech innovation accolade.
The die-cutting unit'southward problem is non a problem since this press uses a magnetic rotary die-cutting unit to which flexible dies are fastened and matches the overall press speed. (This is a bit unlike some intermittent label presses seen in the past, which used a flatbed die-cutter.)
The Miyakoshi MLP 13C at Provin Technos
The intermittent or dorsum and forth substrate moving web first label press in Provin'due south demo middle is called the semi-rotary MLP 13C, and it has two flexo units and 5 offset printing units. Provin too uses the fifth printing unit of measurement every bit a coater. The press also has a de-lam and re-lam unit of measurement. The press runs and performs – it prints and dice-cuts saleable labels at the rated speed of lxx meters a minute. It is being run and demonstrated on fifty-micron and thicker films without chilled cylinders. (For thinner films, additional chill rollers would be required.) The press too has a BST Eltromat AR 4000 auto-registration arrangement and Miyakoshi'south own auto ink-keys.
In the lockdown days, Provin is running the printing for more than just training and demonstrations. It provides a dorsum-upwardly for commercial and characterization printers past printing, slitting, and rewinding labels in a consummate production setup. It outsources the starting time plates at the very nominal cost of Rs. 50 a plate. The printing is eminently productive and profitable for short runs of anywhere from 150 to 500 label stock meters. The advantage of outset over digital would be that you could besides do much longer runs of two,000 to 30,000 meters on such a press.
The CAPEX for a Miyakoshi press may be higher than a narrow spider web flexo label press only keep in mind that you need to buy actress tooling for a flexo press to run diverse print lengths, and you may need several of these. Secondly, calculate the price of making flexo plates, especially for a new blueprint or epitome for a brand owner. The fourth dimension and endeavor of changing the tooling or cylinders and aniloxes for the print length and ink densities also have a cost.
Then compare the quality and ease of functioning of offset and flexo and what y'all tin practice with CYMK and one special color on offset, compared to an 8-color flexo press. (Here, go on in mind that there are possible advantages in both processes and that I am an experienced offset printer. Although trained past DuPont on flexo platemaking, I take nil experience in running a flexo press.)
Since the Provin Technos office has the Miyakoshi running in its sit-in middle, you can make an appointment and run across it in Okhla in New Delhi. I don't ordinarily advise anyone for free, let lone to buy a press, but before yous call back of purchasing a digital label press, I urge you to see this operation live. In case you would like to buy such a press, my free advice is to buy the brand you lot see in a live demonstration to avoid disappointment with other presses that may claim to exist similar.
(If yous get this far, y'all may also phone call the homo, and he often responds to phone calls to his landline. The man's proper name is Narendra Paruchuri, who bought a Miyakoshi semi-rotary a couple of years ago.) Co-ordinate to Vinay Kaushal of Provin Technos, "A characterization printer should have a diverseness of tools. While the semi-rotary offset could be the commencement printing for commercial printers going into labels, it is an essential tool for other label converters."
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Source: https://packagingsouthasia.com/type-of-packaging/labels/the-miyakoshi-semi/
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