Fabric defect · Woven fabric - Warp and filling floats in woven fabric

A float is a warp or filling yarn that passes over yarns it should interlace with. Some weaves float yarns on purpose. As a defect, a float breaks the weave and leaves a short length of yarn lying loose on the face of the cloth.

A short yarn lying loose over the weave, along the length of the fabric, outlined in cyan.

What ConductVision Textile records

ConductVision Textile is designed to flag each defect with its place on the roll, its size, its points and a still image. Your inspector names the defect and confirms or dismisses it.

On the defect map in the roll report, a float is a short line: along the roll for a warp float, across it for a filling float.

Fabric inspectionDefects, points and a final points forecast

What floats are

A U.S. federal glossary of fabric imperfections defines a filling float as "a place in the cloth where a filling yarn extends unbound over the end (s) with which it should be interlaced," and a warp float the same way, for "a warp yarn" that "extends unbound over the pick(s) with which it should be interlaced" ¹. Its other names for them are skip, overshot, harness skip and harness drop ¹.

Goldberg's 1950 casebook defines a float as the part of a yarn "that is unbound by the yarns in the opposite direction as specified by the weave," and adds that "in some weaves, of course, floats may be an integral part of the pattern" ². A float that is a defect breaks that pattern. In one of his cases, a warp end that skipped its harness floated "over several picks at intervals, thus becoming more pronounced on the surface," which gave a single broken streak along the warp, a "dotted-line" effect ².

A U.S. military glossary of knitting imperfections uses the same words for knit fabric, where a float is "frequently referred to as miss-knit" ³.

What causes floats

What causes floats
Stage	What happens	What to check
Weaving	Harness skips, where warp and filling interlace out of pattern, from a harness that is dirty or set too low, or from broken heddles ².	Harness height and cleanliness, and heddles
Drawing in	A wrong draw, where one or more ends go through the wrong heddle or dent ¹. In one case, wrong draws left as many as three ends weaving as one ².	The draw, against the weave plan
Finishing	In sueding, a kind of napping, picks weakened by wrong draws broke and let the warp ends float loose on the surface ².	The draw in goods that will be napped or sueded
Weaving	Single picks cut during weaving, probably by a faulty temple roll, left warp ends floating in a line along one edge ².	Temple rolls

Where floats show on a roll

The federal glossary files the filling float among weave faults "usually found in the filling direction" and the warp float among those "usually found in the warp direction" ¹. So a filling float lies across the roll and a warp float along it.

Floats from one cause can repeat. A harness skip that keeps recurring makes a broken line along one end through the piece ². In Goldberg's temple roll case, the floats ran in a straight line through the full piece "at a distance of about 3 inches from one selvage, repeating at approximately 2-inch intervals" ².

Defect positionWhat a defect's place on the roll points to

How floats count

A float is scored by its length: 1 point up to 3 inches, 2 points over 3 up to 6 inches, 3 points over 6 up to 9 inches and 4 points over 9 inches ⁴. Under the 4-point system, no linear yard or metre gets more than 4 points, however many floats it holds ⁵.

Sources

Pilot - How a pilot starts

We start with recorded video of your inspection frame and agree with your team on one fabric to test. The pilot runs for a set time, and before it starts we agree on what counts as success. For each defect it marks, ConductVision saves a still image and its place on the roll on your network for your inspector to check.

You bring: Recorded video of fabric running over your inspection frame
We set up: One fabric, and the limit you grade it against
You get: Marked defects, running points and a final points forecast for each roll, and a results report checked against what we agreed

One question to start with

Which fabric shows floats most often?

Plan a pilot