NEW DEVELOPMENTS IN POLYMER MIXING, Chris Rauwendaal, Rauwendaal Extrusion


Monthly Dinner Meeting

Tuesday, September 19, 2000

Please note the location is in Palo Alto this month,
not in Mountain View.



Chris Rauwendaal
Rauwendaal Extrusion Engineering, Inc.


Mixing is one of the main functions of screw extruders.
Mixing is usually divided into distributive and dispersive
mixing. It is well known that single screw extruders
generally have poor dispersive mixing capability even when
dispersive mixing elements are incorporated into the screw
design. This presentation will discuss the requirements for
dispersive mixing. Current dispersive mixing elements used
in single screw extruders will be analyzed and the lack of
efficient dispersive mixing capability of these mixers
will be explained.

A new generation of dispersive mixing elements has been
developed for use both in single and twin screw extruders.
Two and three dimensional flow simulation will be used to
illustrate the mixing performance of these new mixers.
Experimental work on the new mixing elements will be also
be presented; the experimental results demonstrate that it
is possible to achieve dispersive mixing capability on
single screw extruders as good as what can be achieved on
twin screw extruders. The implications of these results on
the compounding industry will be briefly discussed.



Cost: $30 ($15 for unemployed/retired/students)

Tuesday, September 19

Social Hour: 6:00 PM
Dinner: 7:00 PM
Talk: 8:00 PM

Location: the "Club House Restaurant",
1875 Ebarcadaro Road, Palo Alto.

From 101 in Palo Alto, take Embarcadaro Road East.
Pass through the first traffic light, and turn left
at the sign for "Airport and Golf Course". The
"Club House Restaurant" will be on the left after
turning into the parking lot. (Look for the large
metal sculpture near the building.) If you go past
the airport you've gone too far.

restaurant phone 650-856-0999
(do not call restaurant for reservations)

Dinner: Buffet style - no advance choice is
required. Options include vegetarian fettucini
alfredo, roasted turkey, and grilled snapper.


- Make reservations by 5 PM Thursday Sept. 14.
- Please provide contact information (email or phone).
- You should receive confirmation of your registration;
if not, please try again.
- Register through the web site (preferred!),
or contact:
Debashis Dutta
- We must ask you to be liable for the cost of
your dinner if you register and do not attend;
cancellations may be made up to the registration


Other events of possible interest to the
GGPF audience:

August 25+ at San Jose State University.
Note that many SJSU classes are taught in the
evening and can be taken by non-degree students.
Upcoming (Fall) evening classes that might be
of interest include:
- Polymer Chemistry (Chem 173)
- Electronic, Optical, and Magnetic Properties of
Materials (MatE 153)
- Composites (MatE 187)
- Structures, X-Ray Diffraction and Imaging
Techniques (MatE 241)
- Optical Microlithography for Integrated Circuit
Manufacturing (MatE 274)
(click on the department of interest for the
schedule of classes)

Sept. 13, Sunnyvale
IEEE/CPMT dinner meeting
"Packaging Trends in Lightwave Electronics"
Jeff Montgomery, ElectroniCast

Sept. 13-14, Monterey
BACAS Symposium on Photomask Technology
Sept. 18-19, Santa Clara
SPIE Symposium on Microelectronic Manufacturing
Sept. 18-21, Santa Clara
SPIE Symposium on Micromachining & Microfabrication
for all three, see

Sept. 27-30, Las Vegas
Composites Fabricators Association:
Composites 2000

Sept. 28, Sunnyvale
One-day short course by Rheometric Scientific
"Introduction to Dynamic Mechanical Analysis (DMA)"
instructors: Ross Clark and Chuck Rohn
(there is also a Sept. 25 date in Irvine)
contact Fred Klein of Rheometric for more info:
Course info should appear at a later date on
< Ed. Note: The course is only $50 and it includes
lunch. Chuck Rohn is the chief rheologist at
Rheometric Scientific and a part-time professor
at the New Jersey Institute of Technology.
Ross Clark is the chief rheologist & materials
scientist at Kelco Corp., San Diego.>

Oct.2-3, San Francisco at SFSU
Modified Drug Delivery Systems
two-day inensive seminar and tutorials

Oct. 2-4, Santa Clara
PackCon 2000
Semiconductor & Electronics Packaging
Symposium & trade show

Oct. 21-25, Las Vegas
Oct. 21-22 GPC short course
Oct. 23-25 International GPC Symposium 2000

October 23-24, Sunnyvale
Short Course on "Practical Design and
Production of Optical Thin Films"

Oct. 25-28, San Francisco
Western Regional ACS meeting

Nov. 1-3, Palo Alto
Analytical Laboratory Manager's Association
21st Annual Conference

Nov. 2-3, San Francisco
Novel Materials for Electronics Miniaturization

Nov. 15
NCCAVS Thin Film User's Group monthly meeting
November topic: Low-k Dielectrics

Dec. 13, UC Extension, Sunnyvale
Noon-5 PM short course:
"Materials Issues in Semiconductor Packaging"
by Prof. Guna Selvaduray, SJSU

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