Weft Knitting vs. Warp Knitting

by Elizabeth / Tuesday, 21 February 2017 / Published in Textile Knowledge

Knitting, a versatile fabric creation method, forms fabric by intermeshing loops of yarn. Two main types of knitting exist: weft knitting and warp knitting, each employing distinct techniques and resulting in different fabric characteristics.

1. Yarn Feeding and Loop Formation

The fundamental distinction lies in how yarn is fed and loops are formed.

Feature	Weft Knitting	Warp Knitting
Yarn Feed	Single yarn or multiple yarns fed horizontally, across the width of the fabric.	Multiple yarns fed vertically, parallel to the length of the fabric, from a beam.
Loop Formation	Loops formed sequentially, one at a time, across the width of the fabric.	Loops formed simultaneously along the length of the fabric (wales), all loops in a course formed at the same time.
Fabric Direction	Fabric grows horizontally (in courses).	Fabric grows vertically (in wales).

2. Machine Structure and Appearance

The machinery used for weft and warp knitting also differs significantly.

Feature	Weft Knitting Machine	Warp Knitting Machine
Appearance	Can be circular or flatbed.	Resembles a weaving machine, often called a “knitting loom”.
Needle Arrangement	Needles arranged in a circle (circular) or a straight line (flatbed).	Needles arranged in a line, parallel to the fabric’s length.
Yarn Supply	Yarn supplied from above or the side of the machine.	Yarn supplied from beams located behind and above the knitting area.
Production	Can produce tubular or flat fabrics, capable of shaping and patterns.	Produces flat fabrics with straight edges, often in large quantities.

3. Fabric Characteristics and Uses

The resulting fabrics from weft and warp knitting exhibit different properties and are used in various applications.

Feature	Weft Knit Fabric	Warp Knit Fabric
Stretch	Greater elasticity and stretchability in width.	More stable with less stretch in width but may have stretch in length.
Construction	Loops are connected horizontally, creating a more flexible fabric.	Loops are interlocked vertically, providing a more structured fabric.
Durability	Can run or unravel easily if a loop is broken, requiring care to avoid holes or ladders.	More resistant to running or unraveling, resulting in a more durable fabric.
Applications	Apparel (T-shirts, sweaters, socks), hosiery, home furnishings, and other items that require flexibility.	Underwear, activewear, swimwear, lace, nets, and automotive fabrics. Can be found in garments like fine linings.
Types	Single Jersey, Rib Knit, Purl Knit, Fleece.	Tricot, Raschel, Milanese, Simplex.

4. Needle Types and Movement

Both weft and warp knitting rely on needles to form loops, and while both use latch needles, their movement and operation are distinct.

Feature	Weft Knitting Needle Action	Warp Knitting Needle Action
Needle Operation	Needles operate individually, forming loops sequentially across the fabric width.	Needles operate in unison, each guiding a specific yarn, creating loops simultaneously along a wale.
Loop Control	Loop control achieved through sinkers or fabric tension.	Loop control managed by guide bars and needle movement.

5. Patterning and Design

Both weft and warp knitting can create complex patterns and designs.

Feature	Weft Knitting Patterning	Warp Knitting Patterning
Pattern Creation	Achieved through needle selection, stitch variations, and Jacquard attachments, allowing for a wide range of patterns.	Achieved through guide bar movement and special needle controls, allowing for diverse patterns, particularly for lace and net structures.
Examples	Intricate colorwork, cable knits, textured patterns, and Jacquard designs.	Lace patterns, geometric designs, mesh structures, and engineered technical fabrics.

In conclusion, while both weft and warp knitting produce fabric by intermeshing loops of yarn, their methods, machine structures, and fabric characteristics differ significantly. Weft knitting offers greater elasticity and versatility for apparel, while warp knitting provides a stable and durable base for technical fabrics and various end uses. Understanding these distinctions allows for informed choices when selecting fabrics for specific applications.