Slow line speeds

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Slow line speeds

Postby mugect » Tue Feb 09, 2021 11:14 am

Hello

Wondering if there are any inherent issues with flexo printing at slow lines speed. Slow meaning less than 10fpm, using UV cure.

Thanks
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Re: Slow line speeds

Postby Gory » Tue Feb 09, 2021 12:11 pm

First thing that springs to mind is can you turn your curing lamps down enough that they do not burn or deform the substrate?
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Re: Slow line speeds

Postby mugect » Tue Feb 09, 2021 3:39 pm

Gory wrote:First thing that springs to mind is can you turn your curing lamps down enough that they do not burn or deform the substrate?


Yes, good one, thanks.

Would this slow speed make one choose a different anilox roller or dr blade?
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Re: Slow line speeds

Postby Gory » Tue Feb 09, 2021 4:00 pm

Not with uv ink, aniloxes determine how much ink is applied, blades wipe excess ink from aniloxes, none of that should change. Uv ink should not dry into the anilox at low press speeds like solvent or water based would, but if you can share more information about why you would want to run so slow, someone may have more relevant experience to share. I am theorizing because I have never even tried to set up a press at less than 100fpm.
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Re: Slow line speeds

Postby mugect » Tue Feb 09, 2021 5:10 pm

Gory wrote:Not with uv ink, aniloxes determine how much ink is applied, blades wipe excess ink from aniloxes, none of that should change. Uv ink should not dry into the anilox at low press speeds like solvent or water based would, but if you can share more information about why you would want to run so slow, someone may have more relevant experience to share. I am theorizing because I have never even tried to set up a press at less than 100fpm.


Other processes on the line limit our speed.
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Re: Slow line speeds

Postby Fuzz » Thu Feb 11, 2021 4:52 pm

Two possible problems. UV could wet out(spread) before getting to the lamps, causing gain. Also, depending on substrate it could dive in then it may only surface cure.
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Re: Slow line speeds

Postby mugect » Tue Feb 16, 2021 11:00 am

Fuzz wrote:Two possible problems. UV could wet out(spread) before getting to the lamps, causing gain. Also, depending on substrate it could dive in then it may only surface cure.


Thank you.
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Re: Slow line speeds

Postby haybers » Mon Apr 26, 2021 2:12 am

hello,

what kind of plate do you use? example flat top ? round top?
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Re: Slow line speeds

Postby KF » Thu Apr 29, 2021 1:00 pm

A lot of Press's have to get to a minimum speed in order for the lamps to kick on.
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Re: Slow line speeds

Postby Jonathanburbank » Sun May 02, 2021 2:18 am

Yes, for example a W&H CI press generally won't print under 100fpm.
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