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+   T-Shirt Forums > T-Shirt Industry Information > Direct to Garment (DTG) Inkjet Printing > Humidity, humdity, humidity!
Thread: Humidity, humdity, humidity! Reply to Thread
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Topic Review (Newest First)
June 9th, 2014 02:56 PM
lazographics
Re: Humidity, humdity, humidity!

Quote:
Originally Posted by ghostofmedusa
Oh - I guess I can get away with that because of the ink line clamps above the head on the FreeJet. They prevent any backward/forward travel of ink once clamped off...

In theory one could put a medical clamp after the capping station, no? That should prevent travel to waste tank. Or even right after the ink containers. I have never had the siphon problem...

Bill - do you run a humidifier in your workshop? After moving from Portland to Vegas I am wondering if I really need that? As the electronics in the environment really dont benefit from humidity.. Just for ink and head
Ah I see. Those clamps definitely help you. Different model printers have different bulk systems.

I run a humidifier only when I am printing. It is recommended to keep the humidity level the same 24/7 when you have ink installed in your printer. I actually don't print all the time so I flush out my print head with cleaning cartridges as soon as I am done printing so it sits completely clean of ink till I am ready to use it again. Its easy for me to do on my 1800 based printer so I take full advantage of it.
June 9th, 2014 02:47 PM
ghostofmedusa
Re: Humidity, humdity, humidity!

Quote:
Originally Posted by lazographics
..I don't recommend putting solution on the capping over night. Many times I have seen it create a siphon effect causing all the ink to get sucked to the waste tank and even vice versa..
Oh - I guess I can get away with that because of the ink line clamps above the head on the FreeJet. They prevent any backward/forward travel of ink once clamped off...

In theory one could put a medical clamp after the capping station, no? That should prevent travel to waste tank. Or even right after the ink containers. I have never had the siphon problem...

Bill - do you run a humidifier in your workshop? After moving from Portland to Vegas I am wondering if I really need that? As the electronics in the environment really dont benefit from humidity.. Just for ink and head
June 9th, 2014 02:25 PM
lazographics
Re: Humidity, humdity, humidity!

Quote:
Originally Posted by soko61
Thanks for the reply Harry. I guest I missed this one. Yes, that was the first part I changed. Then the print head, then ink lines and all seals, all dampers, encoder strip, ribbon cables to head. Did I miss anything?

I printed again today and had more of the same problems. Again my humidity is where is needs to be. My room is hot, 80 to 85. I'm wondering if that is effecting ink flow?
Your temperature can dry out your ink even if you have the proper humidity. 85 is too hot. You should be in the mid 70s at the most.

I believe having a humidity percentage level below 60 is fine. Anything above that can cause corrosion. Always make sure to use distilled water in the humidifier.

I don't recommend putting solution on the capping over night. Many times I have seen it create a siphon effect causing all the ink to get sucked to the waste tank and even vice versa. As long as you have the right temperature, humidity, doing daily maintenance along with wiping the bottom of the head with cleaning solution or alcohol pad, and not leaving the printer sitting with ink for more then 2 days, then you should be fine. Just my suggestion from experience.
June 9th, 2014 01:40 PM
ghostofmedusa
Re: Humidity, humdity, humidity!

A quick explanation of how water molecules cause corrosion and short circuiting:
June 9th, 2014 01:28 PM
ghostofmedusa
Re: Humidity, humdity, humidity!

You should leave a water based cleaning solution in your capping station over night, let the print-head sit right on top of it. Then pump it out the next morning before printing. This will keep the head from clogging because of dry conditions.

Humidity is the enemy of electronics
, one of the biggest causes of shorting. No need to keep the entire machine in a humid environment. Just necessary to prevent ink from drying in the printhead and to prevent premature evaporation of water in ink container. Put some cleaning solution (or Distilled H2O) in capping station over night, every-night. should be brimming with solution before capping. And your nozzle checks will significantly improve
June 4th, 2014 10:01 PM
soko61
Re: Humidity, humdity, humidity!

Thanks for the reply Harry. I guest I missed this one. Yes, that was the first part I changed. Then the print head, then ink lines and all seals, all dampers, encoder strip, ribbon cables to head. Did I miss anything?

I printed again today and had more of the same problems. Again my humidity is where is needs to be. My room is hot, 80 to 85. I'm wondering if that is effecting ink flow?
May 11th, 2014 06:57 PM
102557
Re: Humidity, humdity, humidity!

Quote:
Originally Posted by soko61
Yes, everything means I've replaced everything. I think it comes down to poor product design and perhaps the only way I'll get any kind of consistency is to figure out how to modify the printer. I wonder if there is a way to pressurized the ink system? Ideally I'd like to adapt bulk bottles and not cartridges. Not being able to view how much ink is left is beyond me too and another issue.
It may be cheaper to go to a newer print engine model in the long run over modifying. I don't think a pressure system would be extremely costly. However it seems there is some firmware involved in the process of the pressurizing-the print engine pump activates during the print process and never at the same time it seems know when to turn on the pump based on the print... probably hard to out do Epson on that technology... Maybe modifying your current system to bulk or bags and raising them up a bit could cure your issue.. worth a try anyway.
May 11th, 2014 06:28 PM
102557
Re: Humidity, humdity, humidity!

Pressurized systems have a backflow control (in effect a sealed system from the ink bay to the damper exit). Also the height of your bulk system (bags, bottles) doesn't much matter due to the pump charging the head with ink as needed continually during the print process.

What this means is adjustment (sweet spot) of the bulk system has a big window. typically if you raise a bag or bulk system to high (depending elevation, atmospheric pressure it will not leak from the print head like the older print engines with gravity feed, it also will not starve a head if its to low.

Another great benefit of the new print engines with the pressurized system is if lets say you use more of one color than another the lower color ink doesn't need to be adjusted raised for flow... If your using bulk bottles on a pressurized system just cap your vent holes over night to avoid any evaporation/drying issues with the ink... Its a great improvement/ system, makes dtg printing a dream compared to earlier Epson print engines converted to dtg..
May 11th, 2014 01:15 PM
lazographics
Re: Humidity, humdity, humidity!

Quote:
Originally Posted by soko61
Any chance you know where Billy? Also, how's dtg printing in Las Vegas? I lived there for four years prior to getting into dtg. I would imagine the challenges are similar to dry Santa Fe.
Try contacting dtgprinterparts. They may not have it on their site so you will have to call them and find out.

I'll be honest, I have very little humidity and I don't do a lot of printing. It really depends. Tech work is my main source of income. When I finish an order I install my cleaning cartridges and flush the print head and capping/pump assembly. I never let the printer sit over night with ink in it. It's easy for me to do so I take advantage of it.
May 11th, 2014 01:08 PM
soko61
Re: Humidity, humdity, humidity!

Any chance you know where Billy? Also, how's dtg printing in Las Vegas? I lived there for four years prior to getting into dtg. I would imagine the challenges are similar to dry Santa Fe.
May 11th, 2014 01:05 PM
lazographics
Re: Humidity, humdity, humidity!

Quote:
Originally Posted by soko61
Yes, everything means I've replaced everything. I think it comes down to poor product design and perhaps the only way I'll get any kind of consistency is to figure out how to modify the printer. I wonder if there is a way to pressurized the ink system? Ideally I'd like to adapt bulk bottles and not cartridges. Not being able to view how much ink is left is beyond me too and another issue.
I believe you can get clear replacement bags for your cartridges now which will allow you to see the ink levels.
May 11th, 2014 01:02 PM
soko61
Re: Humidity, humdity, humidity!

Yes, everything means I've replaced everything. I think it comes down to poor product design and perhaps the only way I'll get any kind of consistency is to figure out how to modify the printer. I wonder if there is a way to pressurized the ink system? Ideally I'd like to adapt bulk bottles and not cartridges. Not being able to view how much ink is left is beyond me too and another issue.
May 11th, 2014 01:00 PM
lazographics
Re: Humidity, humdity, humidity!

Quote:
Originally Posted by soko61
I continue to have issues with humidity here in dry New Mexico. Even in a humidified 150sq ft. room at 50% and above I have problems. How is it possible I can go to shows like ISS and see venders use their machines all day in an uncontrolled environment and they get good results? Is there some kind of conspiracy going on?
The purpose for humidity is so that your ink doesn't dry up since the inks are water based. Keeping the humidity levels consistent 24/7 will help keep the ink from drying out when it's at the most vulnerable point which is when it sits over night not being used. Vendors can print at shows because usually the shows are only 2-3 days and the printers are being used all day which keeps the ink flowing. If the printers continued printing in this environment you may not start seeing issues until around a week or so. Of course all this can depend on the temperature as well which also plays a big part in drying out your ink.
May 11th, 2014 12:42 PM
equipmentzone
Re: Humidity, humdity, humidity!

Did you change capping assembly?

_
May 11th, 2014 12:39 PM
soko61
Re: Humidity, humdity, humidity!

I have done that as well. Seriously, I don't think I've missed anything. The pressurized point seems very viable.
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