PostProcess Technologies: DEMI Automated Resin Removal System

   By TriMech Marketing on April 20, 2023

Today we’re going to be focusing on our resin cleaning systems. We’re going to be comparing the most traditional ways to clean resin parts and some more advanced automated ways with PostProcess DEMI equipment. We’ll be cleaning parts live so people can get a good sense of the differences between the two and be answering some frequently asked questions so you can get a sense of some of the benefits and drawbacks to each.

What does the DEMI system do that sets it apart from a traditional ultrasonic cleaner?

With our systems, everything was designed from the ground up specifically for additive. Our DEMI family of solutions are ultrasonic tanks, but they also have heaters and coolers and a pump for agitation. All of which do a really good job of cleaning the internal geometries and organic shapes.

What are some of the different settings that you can control on a DEMI regarding these various features?

You can control the ultrasonics from 0 to 100%. You can control the temperature to plus or minus a degree Fahrenheit. You can control the agitation as well. That’s a big deal because that’s what allows us to run your very fragile parts by dialing down those settings at the same time. If you have more robust parts or have resins with a high heat deflection rate, you can dial up the heat and dial up those agitations to be able to clean those specific parts effectively.

Isopropyl Alcohol (IPA) has a low flash point and is flammable, why do you have ultrasonics and heaters installed on this machine?

We’ve developed a specific detergent here in-house. We have in-house chemists who look at the different resins that exist out there, and they develop detergents specifically for the range of applications. The detergent we have is called PLM and it does a great job of cleaning parts. One of the biggest benefits is that it has a super high flash point. It’s above 220-degree Fahrenheit, so we can utilize this chemistry in our hardware with the pump, the ultrasonics and the heating and cooling. Heating and cooling really helps to clean resin parts and makes them less viscous and easier to clean. The big advantage is that it not only works better but is also far safer, making the PostProcess systems a great alternative to IPA.

Can you tell us about the system’s software?

The software makes the DEMI very easy to use. Changes to the cycle program can be made with just a quick touch of the screen. There are a few variables that you can adjust like time, temperature, and ultrasonics. In addition to that, you can also save and store recipes in the software as well. That way if it’s someone’s first day on the job, you just tell them to run a specific recipe with one touch of a button and they’re able to produce the same clean parts as someone who’s been running the system for five years.

DEMI system

In addition, the software has a lot of safety tied to it as well. That’s another big benefit we have, especially over something like IPA with a low flash point that’s being used in some type of traditional tank that’s coming from somewhere else. We monitor temperatures, so the software won’t let the machine run in unsafe conditions, so you’ll never reach the flash point of our detergent. We also have things like the emergency stop button for safety measures when someone needs to shut down the machine. And we’re also monitoring pressure and level so if the system’s detergent has evaporated too much or the pressures are getting clogged up, it will shut off the machine for you and the software will tell you exactly what’s going on. The reason might be it’s time to change your detergent or add more detergent into the system.

What’s the difference between the DEMI 430 and 830?

The biggest difference is, is the envelope size. The DEMI 430 holds about 17 gallons of detergent, and the DEMI 430 is 14 inches cubed, which matches perfectly with the Origin One build volume. In fact, we have a couple of different tray systems depending on what type of resin printer you’re using. You could take parts right off the build tray and run them freely or you can use a basket system where you slide your trays into it and process your parts right on the tray.

The DEMI 830 again, same type of submerged tank with the hardware of the ultrasonics pump, heating and cooling. But with the 830 you have an 18-inch cubed build volume and that holds about 40 gallons of detergent. So, more room than needed for the Origin One, because you wouldn’t print parts of that size. So, it’s a little bit overkill, but it does offer the option to go longer between having to swap out detergents, which is always nice because it saves time. The 830 pairs really well with medium size SLA build envelopes like the Neo 450.

We have one other system that’s not shown here called the DEMI 4100. Which has the same type of technology, ultrasonics, pump, heating and cooling. But that build envelope is 35 inches by 35 inches by 25. So, that’s more designed for large format SLA builds, perfect for the Neo 800. And then another big difference between the 430 and the 830 is the connectivity.

What kind of connectivity is available on these machines, and is it optional?

A big part of our solutions is making them intelligent for the future. I know a lot of different labs are pulling data into the cloud and using third party software to make things more efficient, resulting in a connected end to end solution. The DEMI 430 is completely standalone, and does not connect, so there is no external communication. The DEMI 830, however, has an ethernet port on the side so you can connect to your plant network, a laptop, or something like that. That allows you to pull out runtime files as CSV files and it can also speak to some of those most common protocols for third party shop management software.

How do I evaluate if PostProcess technology is a good fit?

First and foremost, I’d say contact your local TriMech representative. They’ve worked with and have seen enough applications where they can understand what you’re doing in your lab today, volume wise, and see if it makes sense.

From there, we can go a step further and prove outright that there’s a big benefit compared to what you’re doing today, to doing it with PostProcess. There are two ways in which we can do that. One is benchmarking. That’s one of the best ways to look at what you’re doing today and how we can improve it with PostProcess. You can send parts in for PostProcess to run and then we provide a benchmark evaluation sheet at the end. We’ll tell you exactly how long it ran in our systems for, how much manual labor or action there was, and how many parts you could do at once. That’s usually a pretty good indicator for people of seeing how much labor they could save or how much faster they can process parts.

Another super helpful way to evaluate our technology is doing a virtual tour. So, kind of what we did today, but I can do it on a personal basis where we’ll invite customers in, and we can zero in on the exact technology they want to see. We can run parts live with them and they can see exactly what it looks like to own and operate one of our solutions and where it might fit into their lab. A benchmark, combined with a virtual tour like that, usually gives people the tools they need to see if there’s a good fit for PostProcess in their applications.

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