wear of the printheads

[marel]

hello

in fact I do not understand how a print head can wear because the nozzles are metal and it does not touch the paper? ... nozzles clogged ok ...

Or do I make a mistake?

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en fait je ne comprends pas comment une tete d'impression peux s'user car les buses sont en métal et elle ne touchent pas le papier ?...buses bouchées d'accord...

ou alors je fais une erreur ?

 

[Ink stained Fingers]

There is more to a printhead with its nozzles, there are heating elements, metal film resistors in each nozzle producing the heat for the bubbles expelling the ink. This metal film needs to be isolated against the metal nozzle plate and is isolated as well against the ink to prevent chemical reactions. It is this complex setup in each nozzle which wears over time, the resistor is heating up to the boiling point of the the ink for each ink shot which is quite a thermal stress for millions of those ink shots. That's for bubble/thermal printheads used by Canon or HP, Epson printheads use a piezo effect to expel the ink, and there can be crystal fatigue over time with these actuators.

 

[marel]

waouuuuuuuuuuh !
I am impressed by these explanations and thank you ... now I understand better ...

 

[turbguy]

The nozzles (on Canon Thermal heads) are NOT "metal". They are silicon. The nozzle "plate" is a LSI manufactured component.

The bubble jet process "boils" the liquid "ink to "spit" it out the nozzle openning. Cavitation of the nozzles leads to wear.

 

[The Hat]

The nozzles (on Canon Thermal heads) are NOT "metal". They are silicon. The nozzle "plate" is a LSI manufactured component.

This is all about my head, but I’m learning...

 

[marel]

The nozzles (on Canon Thermal heads) are NOT "metal". They are silicon. The nozzle "plate" is a LSI manufactured component.

The bubble jet process "boils" the liquid "ink to "spit" it out the nozzle openning. Cavitation of the nozzles leads to wear.

thanks.................................

 

[INKJET ARTIST]

No you are wrong.
Nozzle failure by itself for Canon print heads are very rear. In fact if you take a look at nozzle check you would see that the nozzles are not missing on random basis lake they do on Epson clogged print-heads. But in most case you can see that the whole of nozzles branches is missing. Or some kind of patern
What that means?
It means that the problem is in burned driver in Chip that multiplex inkjet nozzles. Or that you have somehow overheated that part of silicon driver.
So the nozzles and heaters may be fine. Not clogged at all. But the electronic that is driving it is broken.

 

[turbguy]

Yes, the most common issue with Canon print heads appears to be some circuitry failure on the LSI nozzle die itself, probably due to overheating. That is why I always use "Night" or "Quite" mode in the print driver. It slows printing and limits the heat duty on the circuitry.

 

[marel]

ok yhanks...
mode quit? ... in my printer parametres I have the mode "silent" ... it's the same?

 

[PeterBJ]

I think it was a typo, "Quite" mode should read "Quiet" mode, so silent mode and quiet mode and night mode are the same. See these settings in the maintenance tab of the driver, the arrow marks the quiet or night or silent mode setting: