Definition
The fold line is the folded edge of a fabric that has been laid double. It is not cut along this edge so that, when the fabric is opened out, a symmetrical pattern piece results.
Use in the textile industry
The fold line is used in mass production and in cutting operations when symmetrical pattern pieces — such as fronts, backs, or sleeves — are to be cut in a single cutting step. The fabric is folded lengthwise or crosswise relative to the selvage so that the fold line serves as a temporary axis and both layers lie exactly on top of each other. This method saves time and ensures that mirrored pieces are identical in shape.
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