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L

LAP FELD SEAM
A joining of fabric, by sewing, in which the fabric is interlocked, with each other.

LAP SEAM
A joining of fabric, by sewing, in which the fabric edges are laid flat on top of each other with no turn under.

LINE PRESSURE
The pressure in the supply line. Also called inlet pressure or upstream pressure.

LOCKSTITCH
A sewing machine stitch in which two threads are interlocked so that if a given thread should break, the thread cannot unravel. Always use a bobbin to supply the bottom thread.

LOOP
A double back of fabric to form a hole through which a finger or hanger can be placed.

LOOPER THREAD
Term used in chain stitch applications to describe that thread which is fed into the sewing process by the looper. This is the bottom thread in the sewing process.

LOT
Unit of production or group of other units or packages taken for sampling or statistical examination.

LUBRICANT
An oil, emulsion, or the like, applied to fibers to prevent damage during textile processing, or to knitting yarns to make them more pliable.