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Engineering Materials

Carbon-Reinforced Compound Bests Metal Specs for Injection Molding

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William K.
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Re: How's the weight
William K.   2/5/2014 12:11:12 PM
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Ann, on further consideration I am not exactly certain of what I was thinking about either. It seems that on occasion something that seems like a good idea at the time turns out to not be such a very wonderful thing. This may have been one of those instances. Fortunately no great harm done this time. Rational thought wins again.

Ann R. Thryft
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Re: How's the weight
Ann R. Thryft   2/5/2014 11:46:10 AM
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William, I'm not sure what you're proposing. Some kind of review article of these various studies?

William K.
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Re: How's the weight
William K.   2/4/2014 6:11:38 PM
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Ann, yes, I have read about it a few times in DN over the years. But I have not seen an online discussion.

And the way to handle a compay slant on an article is by identifiying the author. Consider all of those wonderful articles by Jim Williams and Bob Pease. EAch time they were identified as being with their associated companies, which always prompted me to respect those companies for hiring such brilliant people.So linking author, company, and product would be the best choice. It would instantly identify the bias and also show the basis for credibility.

Ann R. Thryft
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Re: How's the weight
Ann R. Thryft   2/4/2014 11:48:13 AM
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William, this is a highly specialized area of research. There's tons of information and studies out there about recycling of different materials. Unfortunately, much of it is not independently conducted--for example, a lot has been sponsored by one or another materials industry so it's hardly unbiased. Fortunately, there is some good data here and there, sometimes sponsored or conducted by trade organizations of recycler companies. We've done some reporting on this at DN.



William K.
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Re: How's the weight
William K.   2/3/2014 4:01:18 PM
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Ann, I have never investigated the details of recycling aluminum, but it certainly would take more energy to melt it than to melt most thermoplastics. A report on recycling might lead to an interesting discussion string.

Ann R. Thryft
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Re: How's the weight
Ann R. Thryft   2/3/2014 1:27:09 PM
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William, that's a good point about reuse/recycling. Aluminum makers like to talk about how that metal is endlessly reusable. That's true, but it takes a lot more energy and processing than just grinding up and/or melting plastics for reuse.



Ann R. Thryft
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Re: Performance
Ann R. Thryft   1/31/2014 12:22:59 PM
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Greg, that cost/time-saving argument has been a longstanding one for injection molding, but the capabilities of the materials have not made it fully competitive with metals processes. Clearly, that's changing.

a.saji
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Silver
Re: Performance
a.saji   1/31/2014 3:44:23 AM
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@Greg: But in quality wise it's the best option isn't it ? I think quality should be considered 1st since its what matters to keep the business running in the future. 

Greg M. Jung
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Platinum
Re: Performance
Greg M. Jung   1/30/2014 10:03:50 PM
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Great point Ann about the additional cost advantages of one-step injection molding.  While the raw material cost could be slightly higher for this composite material, using injection molding for net shape could bypass more expensive machining methods needed for some metals.

William K.
User Rank
Platinum
Re: How's the weight
William K.   1/30/2014 4:29:01 PM
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It does sound like the fiber reinforced thermoplastics are a worthwhile replacement for the three metals listed, and certainly a good choice over thermosets, since it would seem that thier scrap can be recycled "short loop", by regrinding, while thermosets can't. At least they could be recycled in less demanding applications. Of course cost is always a concern, but that would need to be calculated for each case because of the numerous variables in each application. 

The one thing that was not mentioned was ultraviolet resistance, which is important in some applications.

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