Beyond Circular Knitting: Warp Knitting and Weaving

Once 100% polyester filament has been spun from melt to yarn, it can become fabric through three different geometries. The most familiar — the basis of most of the families on this site — is circular (weft) knitting: a single yarn forms loops in succession across the width on side-by-side needles. But that is only a third of the story. In warp knitting, every needle is fed by its own warp yarn and loops are chained lengthwise (in the wale direction); in weaving, two yarn systems at right angles — warp and weft — interlace over and under each other. When the geometry changes, so do stretch, stability, speed and cost — fundamentally.

Warp knitting: the fastest fabric formation in textiles

Warp knitting is the fastest fabric-forming method in textiles: hundreds of needles loop simultaneously every cycle, instead of waiting for one yarn to travel the full width. There are two large families. Tricot uses few guide bars (typically 2–4) to produce fine, smooth, run-resistant fabrics — the natural route for linings, swimwear, shapewear and lightweight mesh. Raschel runs many more bars (typically 4 to about 78) and knits lace, mesh/net and — on double-needle-bar RD/HighDistance machines — three-dimensional 3D spacer fabric. A key advantage of warp knitting is that although it needs warp preparation, it needs no sizing: the filament is not abraded against a reed.

In the warp-knitting world, the dominant global producer is Germany-based KARL MAYER (Obertshausen). On the tricot side, the HKS series is the reference (typical gauges ~E28–E50 and wide working widths); per KARL MAYER's own figures, the HKS 2-SE series runs up to about 4,400 rpm — which makes the "fastest fabric formation" claim concrete. On the raschel side, single-bar RSE/RSJ machines serve lace and net, while double-needle-bar RD 6 / RD 7 and the HighDistance family serve spacer. For example, the RD 7/2-12 EL has a working width on the order of 138 inches (3505 mm), and double-needle-bar raschel machines typically run at ~700–850 courses/minute. For narrow-fabric and crochet needs (elastic tape, woven ribbon), Jakob Müller / COMEZ form a separate ecosystem.

Weaving: why filament polyester loves the water-jet

The natural weaving route for filament polyester is the water-jet loom. Hydrophobic filament is not weakened by the water droplet that carries the weft, and it dries quickly; this makes linings, taffeta, microfiber, umbrella cloth and innerwear fabrics producible very fast and at low cost. On water-jet looms the weft-insertion rate often exceeds 1,500 m/min — but the method only works with filament; hydrophilic staple (spun) yarn cannot be woven on a water-jet. For a wider range (staple yarns + technical fabrics), the air-jet loom is used; it reaches 1,000–1,300+ picks/min but consumes more energy. Weaving requires its own preparation chain — warping and (for staple/blend yarns) sizing.

On the water-jet side, the Tsudakoma ZW series is the reference leader; in the volume tier, China's Haijia is strong. On the air-jet side, Toyota JAT, Tsudakoma ZAX, Picanol OmniPlus, Itema and Lindauer Dornier stand out. For warp preparation and sizing, machine builders such as Benninger come in. The practical takeaway for a fabric buyer: if what you need is a flat, stable, draping, non-stretch polyester (lining, shirt taffeta, technical-membrane carrier), you are most likely looking at a woven route — and the same yarn and the same disperse dyehouse can feed it too.

Which route wins, and when?

• Lining / shapewear / lightweight mesh: tricot warp knitting — smooth, run-resistant, fine and dimensionally stable.
• Lace / net-mesh / tulle: raschel warp knitting — multi-bar pattern capacity is essential for true triangular net and lace.
• 3D spacer (automotive seating, orthopedic padding, breathable technical cushioning): double-needle-bar raschel (RD/HighDistance) — gap typically ~2–15 mm; neither weaving nor weft knitting can produce this structure in one piece.
• Lining taffeta / microfiber / umbrella / low-stretch shirtings: water-jet weaving — filament hydrophobicity brings the speed and low cost.
• Staple-yarn or technical weaving (wide range): air-jet weaving — more versatile but more energy-intensive.
• Stretch, recovery and soft hand first (t-shirts, sportswear, innerwear knits): circular (weft) knitting — where most of this site's fabric families live.

All three routes share the same upstream engineering. The yarn's IV, luster and POY/FDY/DTY character (subjects covered in our intrinsic-viscosity, melt-spinning and texturing guides) determine the final hand and durability whatever geometry it enters; disperse dyeing is still done at ~130 °C (see our HT disperse-dyeing guide); and the final width and shrinkage are still locked in at the stenter. The geometry choice is the last big lever that determines how the fabric behaves — its stretch, stability, air permeability and strength.

Weft-knit · warp-knit · woven compared