Avoiding the orange peel

When you speak frequently at industry events as I do, you can tell what resonates with your audience. So, it was very gratifying to experience the collective nodding of heads at the Inkjet Conference in Neuss, Dusseldorf this week.

I gave an on update mitigating texture artifacts on inkjet presses using halftone screens.

You see, it turns out that there is more commonality between inkjet presses than we previously thought. I’m not saying that there is no need for a custom approach, because there will always be presses with specific characteristics that will need addressing through services like our BreakThrough engineering service.

What I am saying is that we’ve discovered that what matters most is the media. And it gives rise to two distinct types of behavior.

On reasonably absorbent and/or wettable media drops tend to coalesce on the substrate surface in the direction of the substrate, causing visible streaking especially in mid and three-quarter tones. These issues are amenable to correction in a half tone.

Whereas on non-absorbent, poorly wettable media such as flexible plastics or metal, prints are characterized by a mottle effect that looks a bit like orange peel.

This effect seems to be triggered by ink shrinkage during cure. This can be corrected with a halftone with specially designed characteristics. We have one in test on real presses at the moment.

So it won’t be long now before we introduce two advanced screens for inkjet that will greatly improve quality on the majority of inkjet presses. One to counteract streaking. The other to counteract the orange peel effect. And the next project is to address non-uniformity across the web. Fixing that in software gives you the granularity to address every nozzle separately on any head/ electronics.

And for those presses aforementioned with unique properties that need special tuning? Our Chameleon design tools can create unique halftones for these cases.

I do like it when a good plan comes together!

What is a successful beta test?

You often read news items about a new press having been installed at a beta site but it’s not a topic that gets much of an airing apart from the odd news bulletin, is it?

And that got me thinking.

What is considered to be a successful beta test?  And why should we care?

Well, if you do care, you are not just going through the motions to get your press out of the door. You are more likely to be focussed on delivering a good product. You probably view beta testing as an opportunity to make changes for the better and to help improve product management. You care what comes back because you want to develop a good product. It’s important to you to get understandable and useful data.

So what do you want to know? Your beta test should provide you with proof points as to why your printer is going to be successful in the market. “Real” users will use and abuse your press and put it through its paces in a way that your own internal hardware and software engineers will not. Any weaknesses will be exposed. And you’ll get closer to your customer by working together with them in a way that just wouldn’t be open to you if you didn’t run a beta program.

The thing is how do you extract meaningful data from your test? And how do you rule out those problems that have nothing to do with your press, such as humidity, ambient temperature, the way the site is being operated?

Somehow you need to control the environment that the beta test is conducted in and approach the beta test in quite a formal way to rule out any subjectivity that might creep in.

We’ve got some ideas on how to achieve this which I’ll share in another post. But I’d be interested in hearing how you do it. What are your top tips?

Preparing for the Inkjet Conference 2015

Making progress in half-tone screening technology – our samples are ready to display!

We’re really looking forward to the Inkjet Conference in Düsseldorf next week. Global Graphics’ CTO, Martin Bailey, will be speaking at the conference and focusing on the problems inkjet vendors have encountered when printing on high-speed inkjets, particularly with regard to optimum image quality and droplet placement.

With this in mind, for the last few months we’ve been working with a number of inkjet press manufacturers to develop entirely new half-tone screening technology for presses that can vary the amount of ink delivered in any one location on the media. We’ve just received our sample prints to show you at the Conference and we’re really pleased with the results – you can see the improvement immediately.

The samples show typical ‘before and after’ scenarios: The ‘before’ samples are quite noisy and show mottle and puddling; the ‘after’ samples, printed with Global Graphics screening technology, show much smoother gradients where we manage the transition of droplet size in multi-level heads.

We have also prepared sample prints showing what the output looks like with no tuning on: They show noise and steps in gradients for multi-level output, then we demonstrate what happens when we use transition points of drop size when using inks such as white, orange and violet in the colour spectrum.

Look out for Martin at the Conference and drop by our table in the IJC Networking Arena to see the prints for yourself.

If you are interested in the benefits of half-tone screening on high-speed inkjets and would like to join our research programme, watch our video here for more information: https://www.youtube.com/watch?v=WNrSbb46efg.

Alternatively, contact Martin Bailey directly: martin.bailey@globalgraphics.com

Read Martin’s abstract here:
http://www.globalgraphics.com/company/events/#ijc