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Posted by wurstergirl on August 7, 2006, 3:20 am
Does anyone know how you measure stretch in fabrics that have been
layered? For example, if you laminate two tricots of about 75% stretch
each (with the stretch in the same direction) will you end up with
about 50%? (multiply the stretch factors?) Another example: If I
want about 35% stretch out of my tricot and powernet laminate, and my
tricot is 75% stretch, should I look for a 50% stretch powernet?
All this is for my bras. I've measured the stretch in each of the bras
from which I made patterns. If this multiplication method works I
should have a lot more freedom to choose fabrics. Interestingly I was
baffled by my Panache Tango II bra, which is made of said
tricot-on-tricot. It should have been about 50% stretch, but was
coming out under 25%. It turns out that the sparsely distributed
pattern of embroidered leaves was having a big effect. In the
non-embroidered areas it is indeed much stretchier. I plan to just
shoot for an average in there somewhere.
Pora
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Posted by cea on August 10, 2006, 12:50 pm
wurstergirl wrote:
show/hide quoted text
> Does anyone know how you measure stretch in fabrics that have been
> layered? For example, if you laminate two tricots of about 75% stretch
> each (with the stretch in the same direction) will you end up with
> about 50%? (multiply the stretch factors?) Another example: If I
> want about 35% stretch out of my tricot and powernet laminate, and my
> tricot is 75% stretch, should I look for a 50% stretch powernet?
> All this is for my bras. I've measured the stretch in each of the bras
> from which I made patterns. If this multiplication method works I
> should have a lot more freedom to choose fabrics. Interestingly I was
> baffled by my Panache Tango II bra, which is made of said
> tricot-on-tricot. It should have been about 50% stretch, but was
> coming out under 25%. It turns out that the sparsely distributed
> pattern of embroidered leaves was having a big effect. In the
> non-embroidered areas it is indeed much stretchier. I plan to just
> shoot for an average in there somewhere.
> Pora
---
I think the only way to answer this is to make up a sample which is
large enough to be representational (including enough of the
embroidered leaves area), then measure differrent areas of the fabric
for stretch. You may find you can't really average the stretch---that
some areas will have maximum stretch, while other areas will have much
less, due to over-embroidery. HTH.
Cea
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Posted by wurstergirl on August 11, 2006, 1:32 am
Thanks Cea. It looks like this isn't a known thing, since no one else
responded. I'll have to do my own tests, bleah.
Pora
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Posted by Kate Dicey on August 11, 2006, 4:33 am
wurstergirl wrote:
show/hide quoted text
> Thanks Cea. It looks like this isn't a known thing, since no one else
> responded. I'll have to do my own tests, bleah.
>
> Pora
>
I've just lent my stretch book to a pal, but as far as I remember, if
you double the fabric you halve the stretch: two layers with 50% stretch
will give you 25% stretch.
--
Kate XXXXXX R.C.T.Q Madame Chef des Trolls
Lady Catherine, Wardrobe Mistress of the Chocolate Buttons
http://www.katedicey.co.uk
Click on Kate's Pages and explore!
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Posted by on August 11, 2006, 2:54 pm
Dear Pora,
The rule for stretch is probably the same as the rule for chain--only
as strong as its weakest link.
It would seem that the fabric without built-in stretch, cut on the
bias, would be the least stretchy of the three.
Teri
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> layered? For example, if you laminate two tricots of about 75% stretch
> each (with the stretch in the same direction) will you end up with
> about 50%? (multiply the stretch factors?) Another example: If I
> want about 35% stretch out of my tricot and powernet laminate, and my
> tricot is 75% stretch, should I look for a 50% stretch powernet?
> All this is for my bras. I've measured the stretch in each of the bras
> from which I made patterns. If this multiplication method works I
> should have a lot more freedom to choose fabrics. Interestingly I was
> baffled by my Panache Tango II bra, which is made of said
> tricot-on-tricot. It should have been about 50% stretch, but was
> coming out under 25%. It turns out that the sparsely distributed
> pattern of embroidered leaves was having a big effect. In the
> non-embroidered areas it is indeed much stretchier. I plan to just
> shoot for an average in there somewhere.
> Pora