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[Kornit 931DS] pulse width??

 
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Old December 8th, 2016 Dec 8, 2016 10:37:36 PM -   #1 (permalink)
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Default pulse width??

what does it do? what is the best setting? and GO!!!!!

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Old December 10th, 2016 Dec 10, 2016 6:58:48 PM -   #2 (permalink)
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Default Re: pulse width??

91 views and no one knows?
 
Old December 19th, 2016 Dec 19, 2016 5:51:24 AM -   #3 (permalink)
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Default Re: pulse width??

Google keywords like "piezo", "print head", "pulse width". But I don't know how to get the best setting.
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Old December 27th, 2016 Dec 27, 2016 8:31:59 AM -   #4 (permalink)
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Default Re: pulse width??

I assumed that increasing the pulse width would increase the dot size produced by the print head technology. The range of the increase is not very large you might increase the dot size by 5 picoliters. A print head might be manufactured to produce a max dot size of 80 picoliter (example purposes) but more then likely calibrated to produce only 75 picoliter. Increasing the pulse width will get you to the max dot size. Doing this however can age the print head.

Last edited by mikejmance; December 27th, 2016 at 08:47 AM..
 
Old December 28th, 2018 Dec 28, 2018 5:38:38 AM -   #5 (permalink)
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Default Re: pulse width??

Better late than newer.

In a simple words the drop of ink is created by motion of the piezo element.
This motion is controlled by bias voltage (something like a force) and pulse width (time).
Higher voltage will increase the speed of the drop a bit and also volume / mass of the drop.
Default values are 99.98V for colors and 114.90V for white.
If you have banding issues you can try to increase the voltage a bit (by 2-5V). It will apply more ink on the T-shirt and may help with banding.
Keep in mind that higher voltage may create satellite drops all around print. The motion of piezo will create one big drop and a few small drops at higher voltages.

Higher pulse width will mostly increase volume and mass of the drop.
Default is 8μS.
I would not recommend to change the pulse width.
FYI. Pulse below 3μS will not create any drop but will wobble the ink. This is used in newer machines and called “tickling”. Basically it keeps the ink in motion all the time in order to prevent it from drying.
It may be helpful in the regions with a high ambient temperature to decrease pulse width by 1μS since viscosity of ink will be higher than needed.
 






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