Anilox Line screen question

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Anilox Line screen question

Postby hizuka007 » Mon Aug 28, 2017 11:39 am

Hi,
I have a question, we have a flexography in the company from where I work, it and the manual is full chinese but I can translate it using google translate (not 100% accurate). And one that I see is the Lines per inch or Line Screen which is 300. Does it mean that the flexo can handle a 300 LPI halftone? or if not then what is the maximum halftone LPI that this machines can handle?

Thank you
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Re: Anilox Line screen question

Postby richflexo » Mon Aug 28, 2017 12:37 pm

Hi,

In anilox terms, 300lpi is considered a low line count. The rule use to be 5 or 6 times the dot LPI for the minimum LPI on an anilox. Check out this website for more details.

http://www.harperimage.com/AniloxRolls/ ... ine-Screen

Your 300 LPI would be suitable for line print or white plates only. Typically, anything over 700 LPI is mean for CMYK or screen print only.

rf
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Re: Anilox Line screen question

Postby hizuka007 » Tue Aug 29, 2017 3:13 am

so it can handle 60 Halftone Frequency (LPI) ? . am I correct?
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Re: Anilox Line screen question

Postby richflexo » Tue Aug 29, 2017 4:51 pm

It will, but double check your BCM on the anilox. Are you printing wide web or narrow?

300 LPI anilox usually are high BCM for maximum ink coverage, like 3.0+ for white backup plates or spot type. Theoretically, yes you can do it. But test it out before a live job if possible. I wouldn't recommend printing screens, even at 50 LPI unless it just one tone of colour. You will get serious dot gain and would require major cut back if you're worried about it gaining.

BCM is billion cubic microns and is the amount of VOLUME of ink each cell holds. The lower the volume, ie: 1.5-2.0 is meant for process printing. Anything higher is for line work and combo printing.

rf
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Re: Anilox Line screen question

Postby hizuka007 » Thu Aug 31, 2017 3:10 am

I see,. I will test it, because the manual is in plain chinese.

Thanks
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Re: Anilox Line screen question

Postby richflexo » Thu Aug 31, 2017 1:17 pm

If you are able to, get your plate supplier to make you a benchmark plate. This will have patches of different LPI's and sometimes different dot sizes. You can get them in ranges of line screens. Those charts will help you pick what the best LPI to use for that anilox.
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