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Holzher edgebander glue nozzle clogging

5/5/16       
cabmaker Member

Our shop has a relatively new Holzher 1054 edgebander. We have been having continuous issues with the glue nozzle clogging. Anyone else have this issue and any suggestions?

5/5/16       #2: Holzher edgebander glue nozzle clog ...
Dave L

I assume you mean a single hole getting plugged. Have you removed the dosing rod and cleaned it to bare metal?, e.g. soaking in lacquer thinner (quicker methods welcome). Unplugging a hole with the wire only seems to push the offending particle out of the way, often to float around and plug up a different hole.

...IIRC, leaving the machine on without using it can also cause plugging.

5/5/16       #3: Holzher edgebander glue nozzle clog ...
Jarvis

To clean it pull other the rod when the glue temp it up to temp then push a pice of 1/4" rod up the hole pushing the hot glue out the slot and clean it out with lacquer thiner.
When you put your glue in wipe the dust and debris off

5/5/16       #4: Holzher edgebander glue nozzle clog ...
cabmaker Member

I appreciate your responses. The problem we've been having is way deeper than an occasional clog. Every morning the machine is thoroughly cleaned (including nozzles) and the glue line is checked by running a piece of 3/4 MDF with the trimmers and pressure wheel backed off. When I am satisfied that I have the required result, I then feed the tape, turn the trimmers on, send a piece of material through, and peel the edge back to check glue coverage. And after running the MDF and getting a perfect glue line, I will peel back the pvc and see that I am missing some of my glue line. And then it's raising the beam and poking the nozzles with a wire tool that Holzher provides. Sometimes we go for days with no problems. That puzzles me. Only thing different with this machine is that we are using a .5 pre-mill on all pieces (that's new for me) Dust collection is pretty good but not great. Any opinions as to whether the pre-mill dust could be part of the issue? (I also pull dosing rod twice a week clean and lube with heat resistant anti-seize compound) Any opinions welcome. We are frustrated with this machine.

5/5/16       #5: Holzher edgebander glue nozzle clog ...
Matty Fatbaggs

I have a 1436 (I think) from 1994. I've got the exact same problem since I bought it used 3 years ago. Like you said, it doesn't seem to matter how much you clean it. And for me, it's always the same 2 grooves that clog.

I have a theory. It's that there are certain grooves that are prone to clog for whatever mechanical reason. So when the temperature of the glue drops below a certain threshold, glue just won't flow through. I keep my thermostat set at about 200. My theory is that the ACTUAL temperature varies regardless of what the readout says, and that's why the glue clogs sometimes but not others.

5/5/16       #6: Holzher edgebander glue nozzle clog ...
Dave L

Neither of you have said if you have tried thouroughly cleaning, removing _all_ glue from, the _inside_ of the dosing rod.

5/6/16       #7: Holzher edgebander glue nozzle clog ...
cabmaker Member

Many times Dave. We might try running it without the pre-mill and see what happens. I think if the dust collector doesn't get all the dust off the edge, it travels to the glue nozzle and clogs it. Dave, have you used pre-mill on your bander?

5/6/16       #8: Holzher edgebander glue nozzle clog ...
Dave L

OK. It sounded like a problem I had for months, continued random clogging caused by something that my cleaning wasn't getting out.

I don't have premill, but I'd think things getting in from the cartridge side would be a more likely cause than dust on the edge.

5/6/16       #9: Holzher edgebander glue nozzle clog ...
Jay  Member

Website: http://www.hwccustomcabinetry.com

I have ran hoz-Hers for 20+ years. 2 things i have seen. Dust & debris is getting in the glue cartridge chamber (continuous source of nozzle fouling debris) and (for me it boiled down to) glue. When I ran Jowat I had a lot of clogs, I switched to the high dollar hkp-25, no clogs. I threw the Jowat in the trash and have slept soundly every since!

5/6/16       #10: Holzher edgebander glue nozzle clog ...
Jarvis

Jay I agree with you jowat sucks but we still keep it for p.lam.
We clean ours maybe once a month if that ....I wouldn't do anything but holzher.

5/8/16       #11: Holzher edgebander glue nozzle clog ...
Gerry

We use Dorus KS 217 in a pellet hopper that is a option for Holzher banders. We always keep the lid closed and have had no problems with nozzle plugging.

We are wanting to try the unfilled version of this glue which is KS 351 but have not done so yet.

I would say it is contamination or the wrong glue as has already been suggested.

5/9/16       #12: Holzher edgebander glue nozzle clog ...
cabmaker Member

Thank you all for your responses. The conclusion I am coming to is that it is dust contamination. I will check what type glue we use as well.

5/9/16       #13: Holzher edgebander glue nozzle clog ...
Bob

Agree on the Jowat.
I was die hard Dorrus but when my mechanic suggested Kliebert I tried it and never went back. Wurth brand appears to be Kleibert and at cheaper price.
Also Lakeside http://www.lakesideindustrial.com/ has it and has matched my Wurth price.
Great folks!
Anything Holz Her Edgbanding or Vertical Panel saw -THE go to source.

1/5/18       #14: Holzher edgebander glue nozzle clog ...
Lee Johnson  Member

Website: jotechserv.com

I am way late on this response but Jay is correct. An ongoing problem like this are most generally related to a glue issue. Often times the glue temperature is set incorrectly. Every glue manufacturer has certain temp guidelines for every p/n of glue they produce and there is no "magic temperature" for all glues. Several years ago I did some research in my shop on several name brand glues. I chose the most popular numbers and ran bonding tests on them at different temps and let them cure for 24 hours. Then I did the pull test and found the Kleiberit 782.5 to be the best overall bond for PVC and veneer tapes and to some degree HPL. However, ALL of the glue companies now note on their spec sheets that HPL must be primed and I agree. After some more research I found a water based primer that works like a dream. The Formica 7709 TG is available; just google it for your closest supplier. One customer cut it 50% with water but another says he gets his strongest bond using it full strength. We keep the Kleiberit 782.5 in stock because my customers like it so well and like our prices.

5/6/18       #16: Holzher edgebander glue nozzle clog ...
O

Kleiberit has a great product I have saved many Holzher owners from these clogging issues, Kleiberit also has a cleaning product in cartridge form 761.0 which helps purge and clean the glue system. Proso@dr.com

5/24/18       #17: Holzher edgebander glue nozzle clog ...
Orestes

Kleiberit has a purge/cleaner 761.0
This should help cleaning glue system by cleaning out old burned glue.

5/1/22       #20: Holzher edgebander glue nozzle clog ...
mike

I find this a bit confusing as there are simple ways that you can enjoy your Holzher machine without frustration.
If you contact a accredited Holzher service agent they can replace your element as its 30 years old no wonder its blocking. this an easy job unlike major works on Glue Tank machines.
Also if you have issues with timing perhaps again parts need to be replaced as the glue unit is very accurate when everything is working correctly.
Also new developments to the Glue Jet glue unit make these issues irrelevant no more holes to clear smaller glue ribs for a finer finish and a larger dosing bar for higher flow. By far the best glue application system there is with the best finish in the industry.

10/16/22       #21: Holzher edgebander glue nozzle clog ...
Sean Kovacs  Member

Website: http://www.kovatechcnc.com
I was a Holz Her tech many years back and they did that then as they do now. The system has its advantages but also has fatal flaws, one of them is it doesn't like dirt in the nozzle cavity. one thing I do with my customers is reduce the nozzle temp to 150, and remove the dosing rod completely. Make sure the nozzle is pulled away from the edge line and manually pulse the glue so it comes out the top hole. Using a putty knife that you occaisonally dip in lacquer thinner, you nudge the glue down the front of the nozzle (put a piece of carboard underneath!) and flush one or two complete cartridges to flush out any crap. that will usually do the trick.

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