Re: powder packing density!!!

From: Jean-Marc Boéchat <>
Date: Fri Feb 20 2004 - 17:04:42 EET

Hello list and Toby:

I have a problem with your statement that it packs more densely than perf=
spheres and you said it approaches 0.74. In fact if you calculate the max
packing density of perfect spheres, having the same diameter, it is 0.74=
. So
anything under this is not really interesting to me.
Could you elaborate on your statement?

I think if you want to improve the packing density the easiest way is to =
bi-modal particle distribution.

Just my 2 cents worth! :)

J.-M. Bo=E9chat

Toby Gill wrote:

> Thought this may be of interest to some,
> It has just been published that M& M sweets pack together more densely =
> perfect spheres when randomly jumbled in a container.
> It was also discovered that by stretching the M&M shape (so elliptical,
> like an almond) in computer simulations, a packing density approaching =
> packing fraction of 0.74 was achieved.
> This seems to me to be important to anyone involved with producing
> components from powders, be it by conventional methods or by rapid
> manufacturing techniques. Does anyone have any comments/thoughts on thi=
> development?
> P.S. I have just finished a PhD based on SLS and am currently looking=
> employment. Anyone who has any vacancies arising in the near future ple=
> contact me at the email address above.
> Regards
> Toby Gill

Jean-Marc Bo=E9chat               email: jean-marc.boechat@nafof.mimsyste=
MIM Systems Ltd                 phone:+4126 430 08 08  fax: +4126 430 08 =
Swiss Branch office               website:
P.O. Box
CH- 1723 Marly 2
Switzerland                     "when things go wrong, don't go with them=
Please remove the nafof in my e-mail address before use!
Disclaimer: "I speak for myself only, it's hard enough!"
Received on Mon Feb 23 16:26:06 2004

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