On July 16, 2026, KARL MAYER unveiled the RJ 4/2 EL, the latest addition to its RASCHELTRONIC® family of warp knitting machines. Designed specifically for smart lingerie and sporty athleisure, this machine introduces advanced body mapping capabilities that allow mills and brands to create fabrics with zoned performance—varying elasticity, breathability, and support—within a single, seamless textile. This is not just a model upgrade; it represents a fundamental shift in how functional garments are engineered.
Technology: Beyond Pattern Control to Functional Zoning
The RJ 4/2 EL's core innovation lies in its integration of electronic guide bar control with partitioned knitting logic. Traditional warp knitting machines struggle to produce different mechanical properties across a single fabric piece without post-production assembly. The new machine, however, can independently control the traverse movement of each guide needle, enabling the creation of gradient-performance textiles in one pass. For example, a sports bra can have high-density support in the cup area and a lightweight mesh structure on the sides, seamlessly connected without seams. This reduces material waste and shortens the design-to-product cycle for brands.
Industry Impact: Who Benefits First?
The technology will first impact warp knitting clusters in Shaoxing, Zhejiang, and Changle, Fujian in China, where factories have long competed on thin margins by producing standard lingerie and sportswear fabrics. The RJ 4/2 EL offers a path to differentiation, allowing top-tier mills to escape price wars. However, the high acquisition cost and the need for skilled programmers mean that only companies with existing digital management teams and stable order books can fully leverage its capabilities. For smaller, volume-focused factories, the short-term return on investment remains questionable.
Downstream demand is growing. According to industry data, the global functional intimate apparel market exceeded $18 billion in 2025, with a compound annual growth rate above 8%. Consumers increasingly demand garments that combine support, breathability, and aesthetics, pushing supply chains to upgrade equipment. The RJ 4/2 EL arrives precisely at this inflection point.
Practical Recommendations
For Buyers (Brands and Designers) - Evaluate whether your product line requires zoned functionality. For basic underwear or T-shirts, the machine's added value is limited. For sports bras, shapewear, or medical compression wear, initiate sample development with capable mills immediately. - Request test reports from suppliers using RJ 4/2 EL fabrics, focusing on elastic modulus, air permeability, and wash durability across different zones to verify performance claims.
For Mills (Warp Knitting Enterprises) - Tie equipment investment to confirmed customer demand. Secure joint development agreements with 2-3 core brands before purchasing the machine to avoid idle capacity. - Train or hire technicians proficient in electronic traverse programming. Without skilled operators, the machine's potential remains unrealized. - Budget for facility upgrades, as high-end machines often require stricter environmental controls (temperature, humidity, voltage stability).
Overall, the RJ 4/2 EL marks a tangible step for warp knitting from mass production to customized functional weaving. Prepared companies can use it to widen their competitive moat; those who wait risk losing orders to technologically advanced rivals.