Homebrew PCBs

Since Pulsar paper appears to be dextrin paper, I did a bit of a
lookup on dextrin. One source on the net called it "old fashioned
wallpaper paste" made by cooking flour until it broke down. Anyone
know more about it?

On Fri, 12 Mar 2004 18:34:09 -0000, pygar2 <pygar2@...> wrote:

> Since Pulsar paper appears to be dextrin paper, I did a bit of a
> lookup on dextrin. One source on the net called it "old fashioned
> wallpaper paste" made by cooking flour until it broke down. Anyone
> know more about it?
>
>

if you cook starch long (or digest it) it turns to sugar i think....

ST

<http://www.mse.arizona.edu/~calvert/papers/calvertimaps.pdf>

interesting part: (they try to print oleds and stuff)


Inkjet printing
We have experimented with modified commercial inkjet printers, which fall 
into two groups [3].
Epson, for instance, uses a piezoelectric cantilever to expel drops of 
fluid. For our peculiar
needs of printing multiple liquids in a laboratory environment, we found 
it difficult to avoid
clogging and dripping. HP and others use a thermal system whereby a small 
heater produces a
bubble adjacent to the nozzle, that expels a drop of ink and then 
collapses. In our hands this has
proved more adaptable to a range of liquids. There is a concern that the 
some compounds may
degrade during heating but the very short duration of the pulse makes this 
unlikely, we believe.
We have also used a laboratory printer based on a glass tube squeezed by a 
piezoelectric collar
[4]. Since it is glass, this system allows many liquids to be used but is 
vulnerable to clogging
and does require retuning depending on the surface tension and viscosity 
of the liquid.
Printer manufacturers are interested in increased resolution and so in 
decreasing droplet size.
Droplet volumes have decreased to a few picoliters, which results in 
droplet diameters of 20-30
microns. The final size of a single printed dot will depend on the 
interaction with the paper or
substrate. Paper is not a good model for a plastic substrate but inkjet 
transparencies are
precoated with an absorbing layer and this is similar to what might occur 
during printing of...

ref 3:
3. Le, H.P., Progress and Trends in Ink-jet Printing Technology. Journal 
of Imaging
Science and Technology, 1998. 42: 49-62.


Also look here:
http://www.azom.com/details.asp?ArticleID=1925

they do what we want to do.

ST

According to my 85 year old mother:})

dextrin (wall paper paste) = gravy!!!!!!

Also children's paste.

At 01:34 PM 3/12/2004, you wrote:
>Since Pulsar paper appears to be dextrin paper, I did a bit of a
>lookup on dextrin. One source on the net called it "old fashioned
>wallpaper paste" made by cooking flour until it broke down. Anyone
>know more about it?

Bubba

OLDER THAN DIRT
Country Bubba
(Actually the inventor of Country and Bubba)
In God We Trust

axtein@...
LaGrange, GA

http://ns1.dicomm.net/~axtein/dro


[Non-text portions of this message have been removed]

--- In Homebrew_PCBs@yahoogroups.com, "pygar2" <pygar2@y...> wrote:
> Since Pulsar paper appears to be dextrin paper, I did a bit of a
> lookup on dextrin. One source on the net called it "old fashioned
> wallpaper paste" made by cooking flour until it broke down. Anyone
> know more about it?

All glucose is the basic unit making up all or part of many 
sugars...and is also the building block of starches and cellulose.  
The main difference between starch and cellulose is the length of the 
chain.

On Fri, 12 Mar 2004 15:25:54 -0500, Art Eckstein <axtein@...> wrote:

> According to my 85 year old mother:})
>
> dextrin (wall paper paste) = gravy!!!!!!
>
> Also children's paste.
>

I think you have to cook it to break up the long chains.
then it gets sticky...

Have to try...

ST

----- Original Message ----- 

From: "pygar2" <pygar2@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Friday, March 12, 2004 6:34 PM
Subject: [Homebrew_PCBs] Dextrin...


> Since Pulsar paper appears to be dextrin paper, I did a bit of a
> lookup on dextrin. One source on the net called it "old fashioned
> wallpaper paste" made by cooking flour until it broke down. Anyone
> know more about it?

I think that is how it is made, by hydrolysing starch. Someone recently
mentioned mixing starch with boiling water for coating paper - same thing.
Dextrin should be available from shops selling homebrew beer supplies. I
keep meaning to buy some to try.

Leon