In July 2026, from its headquarters in Obertshausen, Germany, KARL MAYER introduced a significant upgrade to the warp knitting sector: the RJ 4/2 EL, the latest addition to its RASCHELTRONIC family. The machine's core innovation lies in combining jacquard patterning with zonal elasticity control, directly addressing the growing consumer demand for 'second-skin' comfort in apparel.
Technically, the RJ 4/2 EL is more than a simple model iteration. It allows designers to achieve differential stretch within a single fabric panel—meaning a garment can offer firm support at the shoulders while providing high extensibility at the waist or underarm area. This 'body mapping' concept, previously dependent on finishing or panel-stitching, can now be realized during the knitting stage.
Technical Logic and Industry Impact
This breakthrough has a direct transmission effect on the warp knitting supply chain. For brands—especially in athleisure and intimate apparel—the era of 'one fabric for all' is ending. The RJ 4/2 EL delivers 'on-demand' elasticity distribution, responding to consumer preferences for seamless, non-restrictive wear.
From a cost perspective, integrating functionality into knitting simplifies downstream processes. Traditionally, achieving zonal elasticity required panel cutting and subsequent bonding, adding labor and creating discomfort at seams. The new machine uses independent jacquard guide needle control to form loops of varying density during knitting, creating a smooth transition from tight to loose within one fabric.
For warp knitting mills, this means higher investment thresholds but also greater opportunities for product differentiation. Suppliers capable of offering 'integrated forming with functional zoning' will hold stronger bargaining power in brand procurement negotiations.
Redefining Application Scenarios
Smart lingerie is among the first categories to benefit. Sports bras require a stable underband, non-chafing straps, and high elasticity in the cup area—a difficult balance to achieve in a single fabric. The RJ 4/2 EL's precise control mitigates these conflicts.
Athleisure wear also stands to gain. Yoga pants need different stretch and recovery rates at the knee pit, waistband, and leg panels. Traditional methods rely on multi-layer composites or elastic stitching. The new technology allows all differential designs to be completed in one knitting cycle, resulting in fewer panels, fewer seams, and lighter weight.
It is worth noting that KARL MAYER is not the only player in this space, but the market share of its RASCHELTRONIC series means the RJ 4/2 EL launch will accelerate industry standardization of 'elastic zoning.' Other machinery makers are likely to follow with similar specs within one to two years, potentially making the technology accessible to more small and medium-sized mills.
Implications for Sourcing and Development
From the sourcing side, brands must reassess their fabric suppliers' technical capabilities. Where once the focus was on yarn count and weight, now 'jacquard elasticity control precision' must be added to the evaluation criteria. This requires deeper technical understanding from sourcing teams or closer collaboration with machinery makers.
In terms of development cycles, the RJ 4/2 EL's digital design tools improve sampling efficiency. Traditional jacquard pattern changes required machine stops and mechanical adjustments, but the electronic jacquard system supports rapid pattern switching, allowing brands to test multiple ergonomic solutions in less time.