Subject: Re: peelable coating
From: "Dr J"
Date: 15 Jan 1997 05:35:29 GMT
MARCHEM CORP. in Maryland Heights, MO makes peelable coatings,
product number F4422-70 is the only one that comes to mind, but they
will custom formulate to meet your specs. Speak to Wayne Snow or
Sandon Wool, phone 314 - 872-8700.
Good luck. Let me know what comes of it.
Evan Jones (drj@apci.net)
>
>
> Eyal Adler (adler_e@netvision.net.il) wrote:
> : I am looking for a simple coating/laquer that should temporarily coat
> : steel pipes and can be removed very easily - about two months later.
Can
> : anyone assit.
>
> : Thanks in advance,
> : Eyal Adler
> --
>
Subject: Re: Silicone Sealant Removal
From: SHlinski
Date: Tue, 14 Jan 1997 22:38:20 -0800
Dan Hicks wrote:
>
> In <853167674.1594@dejanews.com>, noel@qualcomm.com writes:
> >Hi,
> >
> >My next door neighbor just bought a model home where the builder sold her
> >all the dishes and knicknacks glued together with silicone gel. This was
> >done to prevent stealing from the model home. The builder, of course,
> >tells here she bought the house as is. Now she has all these nice plates,
> >glassware, artwork, and even books looking very pretty but all glued
> >together.
> >
> >We went to a builder's supply and the best they could suggest was an
> >Exacto knife. Does anyone know of a silicone remover that would loosen
> >the silicone without etching glass and fired ceramics? It also needs to
> >not kill my neighbor--she's about 80 years old!
>
> 3M caulk remover. Put it on and let it sit for several hours, then
> gently scrape/pry.
>
> Dan Hicks
> Hey!! My advice is free. Take it for what it's worth.
> http://www.millcomm.com/~danhicks/
Believe it or not, liquid silicone like that used to seal grout has the
effect of softening silicone caulks grip
on various surfaces.
Subject: polymeric membrane for a silicon based microsensor
From: tap@laas.fr (Helene Tap)
Date: 13 Jan 1997 13:32:00 GMT
Dear newsgroupers,
I am studying a silicon based electrochemical microsensor which is based on the use of a semi-permeable membrane.
This membrane should be thin (a few ten microns), not conductive, permeable to little molecules in solution and not permeable to biger molecules like enzymes. The bigest molecule the membrane has to be permeable is the ferricyanide ion FE(CN)6,3-.
If you can help me, it would be very nice from you to send me a message.
Best regards from France.
Helene TAP
LAAS CNRS
7, avenue du colonel Roche
31077 Toulouse cedex
e-mail: tap@laas.fr
Keywords:polymeric membrane, semi-permeable membrane
Subject: Young's Modulus and Termperature
From: Barry O'Sullivan
Date: Wed, 15 Jan 1997 16:38:20 +0000
Hi all,
I am attempting to develop an Artificial Intelligence based design tool to
support designers at the conceptual phase of design. I have quite a strong
engineering background. My question to the experts in this newsgroup is
whether or not there exists an mathematical expression for determining the
effect of temperature on the elastic modulus of a material (e.g. polymer).
Up until now I have been using some graphical representation of these
relationships. What I would like to do is to build this type of knowledge
into the system that I am building. Any information relating to this topic
would be a great help (references, formulae etc..)
Regards,
Barry.
-----------------------------------------------------------------------------
Barry O'Sullivan, Department of Computer Science, Tel: +353-(0)21-903085
University College Cork, College Rd, Cork, IRELAND Fax: +353-(0)21-903113
-----------------------------------------------------------------------------
Subject: Re: plastics pricing
From: "KS"
Date: 15 Jan 1997 20:36:26 GMT
It depends which region you require the "prices" from try our web page
http://www.ptai.com
Kevin
jpostell@ix.netcom.com wrote in article <32DC1293.93F@ix.netcom.com>...
> Do you know where I can obtain pricing
> information (historical, forecast and, most importantly,
> current) on the major volume groups like polyethylene,
> polypropylene, styrene, etc.
> Thank you in advance.
> Jim Postell
>
Subject: Re: Fillers
From: jvadot@babel.asi.fr (Jean-Luc Vadot)
Date: 15 Jan 1997 20:55:40 GMT
In article <32DD4EB9.52C2@ultranet.com>, drgonfly@ultranet.com says...
>
>Hi. Does anyone know to what extent it is possible to put
>inert fillers into plastic. For example, carbon powder, talc, etc.
>
>Regards,
>Marc Andelman
Depends of the polymer and of the filler. Please contact me
jvadot@babel.asi.fr
regards
Subject: Re: Fillers
From: djones1
Date: Wed, 15 Jan 97 20:42:56 PDT
In Article<32DD4EB9.52C2@ultranet.com>, writes:
> Path:
news1.neo.lrun.com!news-out.internetmci.com!newsfeed.internetmci.com!howland.er
ols.net!feed1.news.erols.com!insync!news.azstarnet.com!news.sprintlink.net!news
-ana-7.sprintlink.net!news.ultranet.com!usenet
> From: Marc Andelman
> Newsgroups: sci.polymers
> Subject: Fillers
> Date: Wed, 15 Jan 1997 13:40:09 -0800
> Organization: Biosource
The extent of filler depends on the type of plastic, the type of filler and
the ultimate properties desired so I cannot even give you a range of answers,
except to say that for many systems the filler can be most of the product.
> Hi. Does anyone know to what extent it is possible to put
> inert fillers into plastic. For example, carbon powder, talc, etc.
>
> Regards,
> Marc Andelman
Subject: ANNOUNCE Computer-Assisted Image Analysis & Measurement
From: dti-lhc@inet.uni-c.dk
Date: 15 Jan 1997 13:51:03 GMT
5TH EUROPEAN SHORT COURCE AND WORKSHOP
COMPUTER-ASSISTED
IMAGE ANALYSIS & MEASUREMENT
COPENHAGEN, 16TH-19TH JUNE 1997
Organized by:
Professor John C. Russ, Materials Science and
Engineering Department, N. C. State University, Author of
"Practical Stereology", "Computer-Assisted Microscopy",
and "The Image Processing Handbook".
Professor H. J. G. Gundersen, Stereological Research
Laboratory, University of Aarhus, Denmark. Gundersen is
the author of a number of papers and reviw articles on new
stereological methods.
M.Sc.E.E. Ulrik Skands, Course Manager, Centre of
Chemical Technology, Danish Technological Institute (DTI).
Course fee:
The fee for the 3 1/2 day seminar is DKK 9,000 for
registration prior to February 1st 1997, and DKK 10,500 after
that date. For students the fee is only DKK 7,500. The fee
covers meeting facilities, refreshment, lunch, and the course
material including the Image Processing Handbook and the
Image Processing Tool Kit on CD-ROM.
Information:
General information about the course is available from Ulrik
Skands:
Phone: +45 43 50 46 52; Fax: +45 43 50 46 99;
E-mail: sem@dti.dk
or from the following WWW-pages:
EU Web-page: http://evu.dti.dk/sem-dti.htm
US Web-page: http://vims.ncsu.edu/matsci/IPCourse.html
Subject: Re: HELP, Please read this if you know about plastics drying
From: larryal@enter.net (Larry Alpert)
Date: 16 Jan 1997 01:25:24 GMT
In article <5bhjj8$cv9$2@news3.microserve.net>, cmos@me.com says...
>I was wondering about the placement of the dew point sensor.
>I am thinking about putting it on the dry air input duct. Should
>I place it before or after the heater?
Before heater on the input side.
>
>Also I would like to throw a duct open to dry the silica bed
>when the dew point rises to -30 degrees, is this even posable?
Most drying systems have a regeneration heater in each set of beads or
"beds". While material dries through a previosly regenerated bed, anothe bed
will regenerate.
The actual cycle time of the equipment switching the process/regeneration
beds depends on the hopper capacity, blower cfm, among other things.
Most of these sytems can be set to switch on either time or dewpoint.
I generally set them up for dewpoint switching, but if not properly maintained,
beds may switch too early, and there may have not been enough cooling time
(regeneration temperatures in the 550 f range) before the process blower goes
through the bed. Not bad if drying PET, but bad if drying PUR (low temp
application).
>
>I am unsure if it is best to controll the heater by turning it off
>and on, or by controlling it analogly with an SCR or similar?
Use a proportional instrument with PID tuning (SCR). On/off will work, but
causes a wide spread in process temperature, and can be a nightmare for
some polymers that need precise drying temperatures
I have used many different polymer drying systems over the past 20 years,
and find Novatec systems to be about the best.
You may wish to try a web search for some of the manufacturers to see if
they have specs posted for their systems.
.
>I have no back ground in plastics, my background is in electronic
>engineering. Any help anyone could give me would be greatly
>appreciated.
>
>Jim,
>Cmos@pennet.net
>
>
>
>
>
--
---------------------------------------------------------
Lawrence Alpert FLUORTEK, INC. 610-559-9000 voice
Prod. Dev. Eng. 12 McFadden Rd. 610-559-1919 fax
larryal@enter.net Easton, PA 18045
Custom Medical Extrusions, Compounds, and Assemblies
Subject: Re: INJECTION MOLD COSTS
From: ssmyers102@aol.com (SSmyers102)
Date: 15 Jan 1997 22:29:38 GMT
One point of interest:
Typically, the cost of the mold is all most poeple think about, but the
cost of the plastic part is much more important.
To take one example, your Dannon yougurt cup, you could buy a $10,000
mold or a $250,000 mold to make that part. The first tool might make a
part that costs .35 cents, the "expensive mold" may make a part that costs
.05 cents, after 800,000 pieces you have broken even and after that it is
all profit- why the big difference ? Cycle Time ! Cycle time costs money-
cheap tools go slow and expensive tools go fast- for most high production
applications expensive tools are the way to go -if you only want to make
5,000 pieces however you can't amortize an efficient tool.
Hope you found this of interest
Subject: Re: plastics pricing
From: Jerry Glazman
Date: Wed, 15 Jan 1997 14:46:23 -0500
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jpostell@ix.netcom.com wrote:
>
> This may not be the kind of technical question to which you
> may be accustomed, but any asistance you can render will be
> most appreciated. Do you know where I can obtain pricing
> information (historical, forecast and, most importantly,
> current) on the major volume groups like polyethylene,
> polypropylene, styrene, etc.
> Thank you in advance.
> Jim Postell
Plastics Technolgy Magazine
http://www.plasticstechnology.com
Click on "Resin Pricing Update" on the masthead of the home page. Gives
you pricing (list and actual) for all the major resins.
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Jerry Glazman
Non-Metallic Materials Services, Inc.
--------------4B3C33FE7C2F--
Subject: Re: plastics pricing
From: Jerry Glazman
Date: Wed, 15 Jan 1997 14:40:58 -0500
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jpostell@ix.netcom.com wrote:
>
> This may not be the kind of technical question to which you
> may be accustomed, but any asistance you can render will be
> most appreciated. Do you know where I can obtain pricing
> information (historical, forecast and, most importantly,
> current) on the major volume groups like polyethylene,
> polypropylene, styrene, etc.
> Thank you in advance.
> Jim Postell
Plastics Technology magazine
http://www.plasticstechnology.com
has a page on current pricing on the major resins in each issue.
Subscriptions are free to qualified industry personel. Also check Modern
Plastics and Plastics World.
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Jerry Glazman
Non-Metallic Materials Services, Inc.
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