Static build up on polymeric granules
Static build up on polymeric granules
(OP)
Hello,
The process with which I am involved comprises feeding of polymers in granules form. This is done through feeders with feeding screws. The screw or screws transport the pellets to be fed into the extruder. The problem is that the granules stick to the outside tube of the feeder due to elestrostatic build up. The equipment seems to have a good earth, but the static is still an issue. The granules are non conductive therefore dissipating any charge built is very difficult. I wonder if there is any product that would make the surface of the granules more conductive so they do not get charged so easily or they get rid of the charge easier. I know that ionising air is an option but it is very complicated for me because of room limitation.
Thank you in advance.
Gerardo
The process with which I am involved comprises feeding of polymers in granules form. This is done through feeders with feeding screws. The screw or screws transport the pellets to be fed into the extruder. The problem is that the granules stick to the outside tube of the feeder due to elestrostatic build up. The equipment seems to have a good earth, but the static is still an issue. The granules are non conductive therefore dissipating any charge built is very difficult. I wonder if there is any product that would make the surface of the granules more conductive so they do not get charged so easily or they get rid of the charge easier. I know that ionising air is an option but it is very complicated for me because of room limitation.
Thank you in advance.
Gerardo





RE: Static build up on polymeric granules
http://www.specialchem4polymers.com/tc/Antistatic-Agents/index.aspx?id=
RE: Static build up on polymeric granules
http://www.exair.com/static_eliminator/stat_elim_page.htm
If you Google antistatic additives you will get nearly everyone in the business.
RE: Static build up on polymeric granules
Charged, non-conductive, partcles are attracted to grounded surfaces because the charge is attracted to ground. When the particles touch ground most of the charge on the particle remains struck on the particle because it is non-conductive. Oppositely charged ions in the air will be attracted to the charge and neutralize it.
RE: Static build up on polymeric granules
Gerardo
RE: Static build up on polymeric granules
ChemE, M.E. EIT
"The only constant in life is change." -Bruce Lee
RE: Static build up on polymeric granules
I am having exactly the same problem like you discribed.
What kind of solution did you find ?
It would be gread if you could help me !
RE: Static build up on polymeric granules
RE: Static build up on polymeric granules
RE: Static build up on polymeric granules
Thanks fo your comment, do you know if there is any website which shows an example of gas plasma treatment ?
My feeling is that it will be a to expensive solution.
RE: Static build up on polymeric granules
Your information looks indeed simular with the experience I have until now.When I use "fresh" granules from the package (plastic bag),the screw(feeder) gets contaminated. When I use granules that are put trough the screw feeder already, the granules are less sticking to the feedscrew.
The granles are round 2-3mm and long 2-3mm.The srew feeder is existing of metal parts.
Im thinking about a cheap solution to contact each graules to metal(earth), but also to have enough capacity, does somebody has any idea?
RE: Static build up on polymeric granules
Gas plasma treatement solves a number of surface related problems. Please look at our web site www.pvateplaamerica.com. You can contact me with specific questions and I'll be glad to assist!
Carole Levers