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Monday, October 17, 2011

Twill Bias

Tartan baby blanket woven in 2/8 cotton by Monique - I think this was her 3rd project and she knocked it out of the ballpark - no mistakes in the warp or weft order and a pretty near perfect 50/50 beat

One of the things that can happen with a 2:2 twill is that, upon wet finishing, the fabric can skew along the twill diagonal.

I'm not exactly sure what factors can cause it to happen more dramatically than at other times.  I'd have to weave a bunch of samples and check for things like twist energy in the yarn, density and so on.  All I know is that at times it happens and it can be quite dramatic.

So it was with Monique's tartan baby blanket.  I assured her that it could be reduced if not eliminated entirely in the wet finishing.

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The above is bad ASCII art showing an exaggerated bias along the twill diagonal.  (The twill line is running from lower left to upper right as in the photo.)

During wet finishing, before the cloth dries completely, what I do is take the cloth at the opposite points and pull the cloth back into a rectangular shape and then give it a hard press until dry.  In other words, I'm pulling against the twill diagonal (upper left and lower right hand corners).

One way to avoid this happening is to weave a twill where the diagonal changes direction on a fairly regular basis.  It's one reason I like Wall of Troy. 


If I want to weave large diamonds, I'll use a herringbone threading and treadling so that there are no issues with the outside threads 'falling out' of the cloth when the diagonal changes direction.


6 comments:

Rhonda from Baddeck said...

That's a beautiful twill blanket. I hadn't thought of using 'towel' cotton to make a baby blanket. I want to try weaving tartan-style blankets with my leftover Briggs & Little yarn (I have a lot, but they're not traditional colors).

Laura said...

Since baby blankets need to be washed often, cotton is a good choice, I think. I prefer hems on baby blankets rather than fringes.

The 2/8 cotton from Brassard is strong, fairly tightly twisted and wears well.

cheers,
Laura

Countryside Reflections said...

Hi Laura, I was ready to start a scarf for Weavolution's Halloweave using my hand spun yarn, and weaving it in a regular twill pattern. Now I'm going to use your wall of troy. I think it will be perfect. Thanks for posting it. ~Doreen

Laura said...

The skewing doesn't happen all the time. If I think about it logically it would seem to me that yarns with latent twist energy would skew more than yarns that don't have it. But that's more sampling than I care to do right now. :)

Glad you like the Wall of Troy. It's in Davison's 'green' book in the twill section.

cheers,
Laura

Silvinha said...

Hi Laura this is a hand weaving is incredible and beautiful, I am hand weaving from Brazil, your blog are great
Silvia
http://tearpiaocupacional.blogspot.com/

Laura said...

Thanks, Silvinha - Monique did a great job. :)
cheers,
Laura