Hello Robin
I believe there are different forms of PVA. The adhesive you describe
for plant sheet labels sound like the PVA adhesive we used to have on
postage stamps before the peel-and-stick ones came along, and that is
removable. However, glue sold for sticking wood together is also PVA
and once that's set it's not water soluable.
I've done a bit of Googling
http://www.diydoctor.org.uk/projects/pvaadhesive.htm
PVA or Polyvinyl Acetate is, in its simplest form, glue for sticking
pieces of paper together. One step up the ladder, and a little
stronger, it becomes an excellent wood glue for Diy enthusiasts and
joiners alike. In its extreme, big boy/girl form it becomes an
extremely versatile, waterproof adhesive and sealer, which has an
extraordinary number of uses in the building trade.
http://www.chemsystems.com/newsletters/perp/Dec02_N01S5.cfm
In general, fully hydrolyzed grades of polyvinyl alcohol are used
mainly in paper coating, in textile warp sizing of hydrophilic fibers,
such as cotton and rayon staple yarns, and in laminating film in safety
glass (after conversion to polyvinyl butyral). On the other hand,
partially hydrolyzed grades are used mainly in protective colloids in
emulsions, in remoistenable adhesives, in textile warp sizing for rayon
filaments and polyester fibers, and in printing plates.
I may have got it wrong but I've always thought that the Moravia
permanent 'starch' was in fact much the same as the woodworking
adhesive, and a teaspoonful of that diluted 50:50 with water will
permanently stiffen lace or other textiles - at a fraction of the
price!
Brenda
On 24 Oct 2006, at 02:40, [EMAIL PROTECTED] wrote:
PVA certainly isn't starch, but I've not heard of it being unwash-out-
able. In fact, in museum herbaria, they use only PVA for the labels on
the plant sheets, exactly because it can be removed. If it can be
washed out of paper, surely it can be washed out of lace.
Robin P.
Los Angeles, California, USA
(formerly Pittsburgh, Pennsylvania)
[EMAIL PROTECTED]
----- Original Message -----
From: Brenda Paternoster <[EMAIL PROTECTED]>
Date: Monday, October 23, 2006 7:33 am
Subject: Re: [lace] starching on a pillow
To: bevw <[EMAIL PROTECTED]>
Cc: Arachne <[EMAIL PROTECTED]>
The permanent stiffener from Jana isn't actually starch (despite
the
fact that that's what she calls it in translation). It's actually
PVA,
or some similar polymer. Once it's applied to lace, or anything
else,
it's there permanently and no amount of washing will get it out.
Starch on the other hand is a carbohydrate and will wash out.
Brenda
On 21 Oct 2006, at 17:52, bevw wrote:
This is strictly personal opinion. If you have a
different kind of starch, you may have different
results that I had.
Yes, Jana uses a different kind of starch that penetrates the thread
to bind with it, chemically, and can't be removed (e.g. as by
washing> the lace). The lace piece is quite preserved therefore,
and I suppose
the goop doesn't ooze through the pricked holes in the pattern card
and plastic film.I bought some by mail order, but didn't try it, not
trusting myself with the idea of applying it while the lace was
still> on the pillow (I gave it away to another lacemaker who said 'it
worked.'). Jana also sells a more conventional thread stiffener that
is washable. But, usually for the ornaments she specifies the
permanent type.
Brenda
http://paternoster.orpheusweb.co.uk/
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Brenda
http://paternoster.orpheusweb.co.uk/
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