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RE: Cleaning Injection Molding Dies



A couple of things come to mind.  First, has the cause of the material
sticking to the molds been identified?  If you can eliminate the buildup you
don't have to clean the mold.

One method to reduce the sticking might be to electropolish the surface.
This technique can work well on many stainless steel alloys.  It does
involve a chemical surface finishing technique but it is not an unusual
operation.

Another thought would be to try several "mechanical" cleaning processes.
High pressure water cleaning, with and without abrasive, and steam pressure
cleaning might be sufficient to clean the surface if done before there is
excessive baking on of the plastic.   A third method might be to use an
"abrasive" such as liquid CO2.

Hope this helps.

Dale H. Francke, P.E.
Engineering Service Professionals, Inc.
772.486.3909    FAX  831.576.7360
dale @espsupport.com

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-----Original Message-----
From: owner-p2tech@great-lakes.net
[mailto:owner-p2tech@great-lakes.net]On Behalf Of David Herb
Sent: Wednesday, August 06, 2003 10:21 AM
To: p2tech@great-lakes.net
Subject: Cleaning Injection Molding Dies


Dear P2Tech,

We are looking for information on environmentally friendly alternative
methods for cleaning plastics injection molding dies, screws, etc. to
remove cured plastic residue.  There is significant concern that
burn-off ovens, fluidized bed cleaning furnaces, and conventional hand
mechanical cleaning followed by hand torch cleaning leads to the
formation of HCl, HBr, HF, dioxin and furan emissions.  Are blasting,
cryogenic, or environmentally friendly solvent cleaning techniques
available?

Thanks in advance,



David Herb
Environmental Engineer
Pollution Prevention Program
MDEQ - ESSD
Constitution Hall
1st Floor, North Tower
525 West Allegan
P.O. Box 30457
Lansing, MI 48909-7957

Phone: 517-241-8176
Fax: 517-241-7966
Email: herbdw@michigan.gov


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