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Old 11th March 2014, 10:32 AM   #1
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Default ways to lightly stiffen a paper cone(varnish etc)

Looking to impregnate a paper cone without killing it by adding too much weight - is there a varnish or another substance that will lightly impreg a cone without adding much mass?

Last edited by Bill poster; 11th March 2014 at 10:35 AM.
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Old 11th March 2014, 11:14 AM   #2
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Varnish is too heavy, it may add various grams to the MMS if the cone are big.
Stiff the cone are easy in the making process adding fibers as Kevlar etc, after this stage is need add something hard to succeed.

In my country there is this fixer spray used to conserve paper drawings and prevent humidity and mold:
Verniz Spray Fixador Acrilex - Fosco
It came in 2 flavors: mate and bright, I used bright.
Its not wet or a heavy liquid as paint, Its as a cloud when sprayed.
I unaware if it will stiffen the cone, but it very effective to prevent mould.
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Old 11th March 2014, 11:23 AM   #3
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Thanks, thats good info and kind of what I'm after, altho I want to add a powder to the spray or liquid first.

maybe something like this http://www.eckersleys.com.au/site/as...ml_0915100.jpg

Last edited by Bill poster; 11th March 2014 at 11:25 AM.
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Old 11th March 2014, 12:11 PM   #4
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water based Gesso perhaps Clear Gesso - Liquitex
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Old 11th March 2014, 12:22 PM   #5
xrk971 is offline xrk971  United States
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PVA thinned with water?

Also PVA layer with thin strips of lightweight aluminum foil bonded in radial spokes on the cone will add very little mass and provide quite a bit more stiffness. I have not tried this but it is what I would so based on mechanical design principals. Also thin strands of carbon fiber thread soaked in PVA and applied on cone radially will help even more than aluminum.

Last edited by xrk971; 11th March 2014 at 12:30 PM.
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Old 11th March 2014, 12:26 PM   #6
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the good thing with gesso is it won't crack over time but I don't know if it wd make the cone stiffer than standard PVA or not
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Old 11th March 2014, 12:48 PM   #7
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Nitrocellulose lacquer?
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Old 11th March 2014, 12:52 PM   #8
xrk971 is offline xrk971  United States
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Lac bug resinous secretions dissolved in alcohol, aka shellac.
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Old 11th March 2014, 01:11 PM   #9
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I would stay away from stuff which was not designed to be used on the speaker membrane, or even not intended, succesfuly tried before. Otherwise you may ruin or alter the performance so much, that speakers end up unusable. I know what I am talking about, I killed some...
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Old 11th March 2014, 02:03 PM   #10
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I agree Adason, I don't want to destroy the response. I'd use a spray gun and use a small amount.
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