BN-20 dripping ink when performing perf/contour cut

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mrtn
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Re: BN-20 dripping ink when performing perf/contour cut

Post by mrtn » Wed Feb 14, 2018 11:32 pm

Ink pumping (klak-klak-klak) with the print carriage slightly to the left from parking spot is normal. The vacuum pump loads up the print head with ink and drains the unnecessary drips from the capping station by offseting the head and sucking the captop dry.

The dirt in question may be anywhere in the bottom of the head carriage. As the carriage is so close to the media it picks up any hair or dust on the media and now as it moves left and right it also absorbs ink fumes and mist in the dust until a critical mass is achieved and it drops on the media.
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robbo78
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Re: BN-20 dripping ink when performing perf/contour cut

Post by robbo78 » Wed Feb 21, 2018 2:42 pm

Hi mate, I appreciate your help but this definitely isn’t to do with dirt on the head. When it makes the klack klack noises halfway through a cut I can immediately see the drip form on the head and it’s only a matter of seconds longer in the cut process that it gives up and drips onto the media.

What’s more is that if I perform a smaller cut job I don’t get any issues at all.

Is this just a fault with my machine or can all BN-20’s not cope with long winded cut jobs?

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Re: BN-20 dripping ink when performing perf/contour cut

Post by khandyside » Mon Sep 10, 2018 1:07 pm

Good Morning - my BN20 is doing the exact same thing - dripping yellow ink during a cut process. I have read the posts and cleaned around the head, changed the capping station, etc. i notice that when going to clean around the head, i can see large drops of yellow ink hanging from the head.
when i do small prints, then cut, not as many problems, however if i do a large print/cut, when it get to the cutting process, you can hear it pump, then following that, yellow drops on the vinyl.
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Kai Perry
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Re: BN-20 dripping ink when performing perf/contour cut

Post by Kai Perry » Tue Sep 11, 2018 8:47 am

Look at replacing the wipers as there may be more contaminate on the head and the wipers aren't wiping it away correctly.

As a guide wipers would normally be replaced every six months or so.
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robbo78
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Re: BN-20 dripping ink when performing perf/contour cut

Post by robbo78 » Wed Sep 12, 2018 8:00 am

Thought I would update this thread since others are having the same issue. I had an engineer out who changed the dampers in the head which solved the issue.

Don’t waste your time trying to clean every part as it’s most likely the dampers which an engineer will sort out straight away.

Just for a bit of information on dampers if you’re not aware. There is a damper for each cartridge. Dampers are small rectangular containers in the head which store the ink ready to be sprayed from the head - think of them as a kind of buffer between the cartridges and the head.

Apparently over a period of time a damper can swell up which then loses the ability to hold the ink and in turn causes the drips from the head.

The engineer told me that the dampers should last a few years from new, although a few of my dampers failed after around 3 months!

Hope this helps anyway.

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