What Is a Splice?
Have you noticed what looks like a seam in your fabric, binding or welting? Don’t worry — this is totally normal. The seam created where two pieces of material are joined together is what’s known as a splice. There are plenty of reasons a manufacturer would put a splice in any given length of material. We’re here to explain how and why.
From left to right: the underside of a splice in vinyl binding, the right side of a splice in vinyl binding, the underside of a splice in acrylic binding, and the right side of a splice in acrylic binding.
Splices in Fabric
Finding a splice in yards of fabric is rare, but it is more common in certain types of fabrics than others. For example, foam backed headliner from brands like Morbern® are known for having splices in the vinyl. In order to work around these splices, we recommend ordering up to 20% more material than you think you’ll need.
Splices in Bias-Cut Binding & Welting
When it comes to binding and welting, splices are inevitable. Both types of trim are made from bias-cut fabric. This means that, rather than cutting straight up the length of the fabric to create the trim, a manufacturer cuts the fabric into strips at a 45 degree angle, diagonally across the fabric. Because this results in shorter lengths of fabric, the pieces must be sewn together into a continuous strip to get the highest yard yield. Frequent splices are to be expected in any quantity of binding or welting.
This diagram shows how fabric is cut on the bias, and how those strips are joined in a splice to create a continuous piece of fabric.