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MAPP Plastics Discussion Forum

The MAPP Plastic Industry Discussion Forum allows members to rapidly communicate with each other. Post both questions and answers to questions that other MAPP members have about any industry topic from material and process issues to R&E Tax Credits and other business issues.

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Posted:  21 Aug 2008 20:09
We've started an initiative to reduce the amount of dust in our facility.  The reasons for our initiative are to reduce material contaimnation, improve facility cleanliness, and address OSHA regulations for dust fires. 

Most of our dust comes from regrind.  We've started replacing granulator blades on a regular basis, but it's only helped marginally.  I'm interested in finding out what others are doing to minimize dust in their facilities.

Thanks!

Mike Walter
Posted:  25 Aug 2008 17:30
We strive to maintain a clean as possible environment,Daily housekeeping in production is strictly enforced as well as a staff janitor. Some facilities have removed the regind operation from the production floor and gone with dedicated areas with proper ventilation. with careful planning this is a significant remedy.
Good luck
Rene W Wert

Rene W Wert
Posted:  25 Aug 2008 18:23
Our grinders use cyclones and we confine them to a designed area and currently use tarps to confine it.  We will be putting up a wall in the future.

David Smith
Posted:  25 Aug 2008 18:53
Mike, we use filtered air and turbine air. Air condition keeps us as clean as we need. No cardboard boxes allowed.

Paul Carnes
Posted:  26 Aug 2008 02:13
Depending on the size or style of the grinder, you might be able to switch from a blower to vacuum for evacuation.  Sharpening the blades should help.  Have you had anyone make sure that you are using the right style grinder?  If you are not grinding tough parts and throughput is not an issue, you might be able to slow the grinder down.  A lot of times people will put in smaller screens than those required for the application.  This will cause excessive dust as well.  Determining whether the dust is coming from the grinder or from the evacuation will help you determine where to look for the cure.  I hope one of these helps.

Tom Thompson
Posted:  26 Aug 2008 14:31
To solve the dust issue created by the regrind operation we built an enclosed room with filters for intake and exhaust air as components of its own air handling system.  This is more bother than regrinding at press side, but it works. 

Dan Cunningham
Posted:  26 Aug 2008 15:58
The type of grinder will have a great effect on how much dust you create.  Dependent upon how much you are grinding and the frequency of grinding.  We do pharmaceutical molding and have grinders on the production floor.  Slow rotating grinders that slowly munch with teeth at the plastic do not create nearly as much dust.  Also utilizing vacuum instead of blowers and maintaining the filters on them daily are good rules of thumb.

Dennis Kelley
Posted:  27 Aug 2008 18:47
I attended a loss control insurance seminar many years back. Regrind dust isn't the same as organic dusts when it comes to fires and explosions. For example excess organic dust such as in a grain elevator can cause catastrophic damage if ignited.

In a lab we made small explosion with a very small amount of household flour. We tried the same thing with regrind dust and nothing.

Of course the dust is a nusiance and hampers your housekeeping efforts. Our hopper loaders have blowback and they're problematic for dust.
Posted:  28 Aug 2008 01:20
Thanks everyone for your suggestions.  We'll be reviewing this information in our next production meeting, along with our screen sizes and conveying methods.

To answer some of the questions above: we use slow RPM grinders (Econogrind) for runners/sprues and smaller parts.  We also have a couple of larger capacity Nelmor grinders with the standard blades.

Mike Walter
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