When a warp knitting machine begins to understand the contours and movement logic of the human body, the base layer market stands at the threshold of a qualitative shift. KARL MAYER's RJ 4/2 EL, launched in July 2026, pushes the boundary of its RASCHELTRONIC® series from general pattern knitting to the precise realization of body mapping. The direct consequence is that the supply chain leverage for smart lingerie and athleisure is quietly shifting from brand design to equipment capability.
Technology Focus: From Patterns to Function
The RJ 4/2 EL's core breakthrough lies not in speed or width, but in its ability to independently control the trajectory of individual yarns. Traditional warp knitting machines form patterns through collective movement of guide bars. The new model, using electronic shogging and piezoelectric jacquard technology, can achieve multi-zone, differentiated density yarn placement within a single knitting cycle. This means a single bra can simultaneously have high-elastic support zones, breathable mesh areas, and soft fit sections, all without post-production stitching.
From an industry perspective, this technology directly addresses two key consumer pain points: the growing demand for zoned functionality in sportswear, and the rising preference for seamless, one-piece manufacturing. KARL MAYER has merged these two demand curves at the equipment level.
Industry Impact: Supply Chain Efficiency and Design Democratization
For warp knitting mills, the most immediate benefit of the RJ 4/2 EL is a shortened production process. Previously, achieving a body-mapping effect required multiple machines to knit different functional zones, followed by cutting and sewing. The new machine compresses this into a single, one-step process, drastically reducing defect rates and labor costs. For a sports bra, traditional methods require 4-6 steps; the new equipment can reduce this to fewer than 2 steps.
For brands and designers, enhanced machine capability means fewer creative constraints. Past limitations in pattern and function often forced designers to compromise between functionality and aesthetics. The RJ 4/2 EL's higher knitting freedom allows for gradient elasticity, local cutouts, and pattern textures to be layered within the same fabric, directly expanding the design language for athleisure and smart lingerie.
In terms of market dynamics, this technology will accelerate the penetration of high-end functional fabrics into mass markets. Body mapping was previously confined to premium product lines of professional sports brands due to high equipment costs and low throughput. As mainstream equipment makers like KARL MAYER standardize and scale this technology, small and medium-sized mills can potentially enter this segment within 2-3 years through equipment upgrades, thereby lowering the price threshold for end products.