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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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Plastic Industry Forum - Converse with Plastics Processing Leaders / Business / Prevention of Rust and Scale Build-up in Molds and Machines
Posted:  05 Jun 2008 21:00
Dear MAPP Members:

My company, Ironwood Plastics, is looking for a solution that will keep the rust and scale out of our injection molds and plastic molding machines.

We figure that the solution will involve a water treatment process.

We are in need of feedback and wanted to know if somebody has any sugguesions on how to fix this problem.

Any help would be greatly appreciated!  If you can post your response to the MAPP website, I will be checking it often!

Thank you.
Tel: 906.932.7510

Mark Stephens
Posted:  09 Jun 2008 23:05
We use a water treatment company.  They analyse our water and they treat the process water based on the analysis.  The company we use is Rochester Midland but I am sure there are local companies In the yuper!
Posted:  10 Jun 2008 16:39
First of all, I have to assume that this rust and scale is primarily in the water passages and is related to the mold cooling process. However, let's get a few other possibilities out of the way first.

Mold space dehumidification is something to consider of course. Placing or utilizing a mold space enclosure and dehumidifying unit at the press is always a good idea.

Also, if the mold is rusting and scaling during storage you may want to consider a mold storage room/plant dehumification system. Another possibility is a dehumification room where wet molds can be quickly dried after use - before being stored.

But to the most likely problem. Chemical treatment and filtration (straining) is commonly used for this issue. Many people run glycol in their lines to help prevent contamination and corrosion. An in-process filter strainer should always be used as well.

I'm not an expert in any of these areas, but I'm sure someone at Conair can help you through this...please feel free to call me if you like at 724-584-5507 and I can get you in touch with someone who can really help.

Eric Pitchford
Innovation Manager, Conair
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