From: Ian Gibson (igibson@hkucc.hku.hk)
Date: Wed May 07 2003 - 04:08:14 EEST
Neil
I was told that DTM did in fact supply coloured powders to selected
customers who wanted to make parts in standard (e.g. computer brown/grey)
colours. This didn't work very well for obvious, marketing reasons. This
was one of the reasons we looked at colouring in-situ.
Certainly there would have been differences in the laser/material
interaction for different colours/additives. We noted changes in thermal
conductivity for example, although it is probably not so much due to the
colour as some of the other material properties (molecule size, lattice
structure, etc.). For homogeneous mixtures this would be quite easy to
characterise and program. Where you are making functional gradients (i.e.
changing the mixture), this would be more difficult.
IG
At 10:22 AM 5/6/2003 +0100, Neil Hopkinson wrote:
>Doug,
>I assume you have coloured the parts after they have been built. Ian
>Gibson at Hong Kong University has tried adding colour and graphite to SLS
>material prior to sintering. Has anyone tried using coloured powders for
>SLS and does it affect the ability of the powder to absorb the laser or
>any other processing parameters?
>
>Neil
>-----Original Message-----
>From: owner-rp-ml@rapid.lpt.fi [mailto:owner-rp-ml@rapid.lpt.fi]On Behalf
>Of parts@protocallonline.com
>Sent: 02 May 2003 17:28
>To: RP Mailing List
>Subject: Vinyl dyes
>
>Is anybody using vinyl dyes for coloring SLA, SLS or other prototype parts?
>
>I recently used this to color some plastic parts and it worked great.
>
>It is a penatrant, not a coating, so it did not fill in the small text on
>the piece I colored.
>
>It also seems to be quite durable.
>
>Just curious.
>
>Doug Johnson
>
>ProtoCall, LLC
>
>507 West College Avenue
>
>Waukesha, WI 53186-4501
>
>262.446.3104
>
>262.896.8945 fax
>
><http://www.protocallonline.com/>www.protocallonline.com
>
>
>
><http://www.protocallonline.com/>18ef3d.jpg
>
><mailto:parts@protocallonline.com>parts@protocallonline.com
>
>
>
>
>
Dr. Ian Gibson
Department of Mechanical Engineering
The University of Hong Kong
+852 2859 7901 (O)
+852 2858 5415 (F)
+852 2817 1784 (H)
+852 9873 8281 (M)
Still crazy after all these years.
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