I am sewing a large number of 10 inch long by 1 inch wide 2 and 3 strip sets. The background strip is a regular cotton and the other strips are Hoffman batiks. When I sew 2 strips together, they come out of the sewing machine slightly bowed. The center spot is bowed down (so it looks like a smile when placed on the cutting board the same side up and was sewn) by 1/8 of an inch. I am wonder if there is something I should be doing or changing that would prevent that.
I am using a new sharp 70/10 needle that was recommended to me for use with my batiks.
I am using Connecting Threads thread which is 50 weight.
Is there something that will stop this from happening or do you just need to correct it by straightening out the piece gently when you set it to press?