UV Resistance and Sewing Threads
UV light can affect a sewing threads integrity; understand how and what can be done to minimise UV degradation.
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Coats does not recommend adding any additional lubricant/silicone to thread. It can change thread color and cause variations in friction, resulting in oil stains. Atomized silicone may also pose a health issue if inhaled by operators/machinists.
The dye uptake depends on many parameters such as cotton type, quality, finish etc. and any difference in these parameters between the fabric and thread will result in shade difference.
To improve seam elongation, you can increase the stitch rating per cm or inch, increase the bite, reduce the needle/looper tensions on affected seams, or change the type of thread used.