Vortex Tube Cools Glue On A Paper Folding Machine

I recently worked on a cooling application with an engineering company who designed a paper folding machine for their customer. As the paper enters the machine, it travels over a series of rollers or “plows” that folds the paper into the desired design. At the last step a heated glue is applied to the edge so the paper stays folded. After the paper leaves the folder it is sent to a stack machine to be processed and packaged for shipment. It was at this area they were starting to see some issues arise as the glue was retaining heat, causing it to leak onto the dividers of the stacker or other finished papers.

Example of a paper folding machine

To try and remedy the situation, the customer had installed an air nozzle to blow compressed air across the last fold and while this did work somewhat, they had to operate at really low pressure so they didn’t cause the paper to move while trying to cool the glue. This slowed the process down, which was negatively affecting their production output, so they reached out for assistance on a more reliable solution.

After further discussing the process with the design company, I recommended they use our Model # 3908 Small Vortex Tube Cooling Kit. The Vortex Tube Cooling Kits include the Vortex Tube, cold muffler, tubing, filter separator and all of the generators to change the flow rate and cooling capacity of the Vortex Tube during operation. The temperature drop from the supply air temperature and the volume of air being exhausted can be controlled by adjusting the valve in the hot end to change the cold fraction (the percentage of air being exhausted out of the cold end versus the amount of air being exhausted out of the hot end).

Items included in a Vortex Tube Cooling Kit

By incorporating the Cooling Kit into the process, the customer would be able to experiment with the airflow and temperature to achieve an acceptable balance, providing enough cold air to cure the glue, while not disrupting the process. If you have a similar process you would like to discuss, please contact an application engineer at 800-903-9247 for assistance.

Justin Nicholl
Application Engineer

The Folding Machine 4 image courtesy of Ms. Tharpe via creative commons license

The Rate Is Right?

This morning, we played our own little version of a popular segment of the game show “The Price Is Right,” right here in the Application Engineering department. Brian Farno (our manager and host extraordinaire) presented us with a question (that he already knew the answer to after speaking with a current customer):

What would you expect the conveyance rate to be, for an EXAIR Model 6083 1-1/2” Aluminum Line Vac, conveying hot-melt glue pellets, across a total distance of 15 feet vertically & 100 feet horizontally? (And please note we normally have a bulk density in lbs./ft3 and/or other associated information about pipe bends, product shape etc. – but we took our best shot at it anyway).

Our office doesn't look like this.  I kinda wish it did, though...
Our office doesn’t look like this. I kinda wish it did, though…

We didn’t have those cool podiums to stand behind that recorded our answers on the screen, but here’s what we came up with:

Russ Bowman: 5 lbs per minute
Dave Woerner: 10 lbs per minute
Justin Nicholl: 8 lbs per minute
Professor Penurious: 1 lb per minute (Insert $1 bid joke here)

Now, we had all referenced our wealth of data charts for conveyance rates with our Line Vac product series. We used several very different materials over a few different lengths/heights, and use that data to estimate what a user might expect to see, based on how close their application is to our actual test conditions. I actually used this data for my answer – a 1-1/2” Aluminum Line Vac conveyed tumbling media (64 lbs/cu ft; the lowest bulk density material we tested for) at a rate of about 5-1/2 lbs/minute, going 20 feet vertically.

Left: hot-melt glue pellets.  Right: tumbling media
Left: hot-melt glue pellets. Right: tumbling media

Turns out, Dave came the closest without going over: they were actually getting a little over 11 lbs per minute…again, going 15 feet up and 100 feet over. The user was so pleased with the results, they’re incorporating a Line Vac in a similar application, involving hot-melt glue pillows. We’ve now added their data to our database and are pleased with the knew knowledge.

If you have an application involving hopper loading, bulk material conveying, chip removal, parts transfer, etc., and would like to find out how an EXAIR Line Vac can help, give me a call. We might both be impressed with the results. Come on down!

Professor Penurious, by the way, is still concentrating on hosting the game shows.  Stay tuned…

Russ Bowman
Application Engineer
(513)671-3322 local
(800)923-9247 toll free
(513)671-3363 fax
Visit us on the web
Follow me on Twitter
Like us on Facebook