A signal worth noting for the warp knitting supply chain has emerged from Germany: KARL MAYER has added the RJ 4/2 EL to its RASCHELTRONIC® series, specifically targeting body mapping applications. This means the technical ceiling for fabric design in smart lingerie and athleisure is being raised, giving mills and brands more room for product differentiation.
Background
The RJ 4/2 EL is not a simple iteration. By further integrating an electronically controlled jacquard system into the warp knitting machine, pattern and structural changes can now be made via electronic signals rather than mechanical needle changes. This technical maturity directly reduces the switching cost for small-batch, multi-variety orders—a significant advantage for the intimate apparel supply chain, which is trending toward quick response and customization.
Industry data shows that warp knitting machines have long dominated elastic fabrics and mesh structures, but the adjustment cycle of mechanical systems often forced designers to compromise on body-mapping zones. The RJ 4/2 EL theoretically allows differentiated elasticity, breathability, and support in different areas of a single fabric, without the need for stitching or post-processing.
Industry Impact
For man-made fiber and yarn suppliers, this new machine means more complex raw material requirements. As warp knitting machines handle finer jacquard and structural changes, yarns must have higher uniformity, elasticity, and thermal stability. Conductive yarns for smart lingerie and high-elastic nylon for compression sportswear may face a new round of process adaptation.
For downstream brands and contract manufacturers, the RJ 4/2 EL will directly alter product development workflows. Body-mapping zones that previously required multiple sewing steps can now be completed in a single knitting process. This optimizes cost structures by reducing cutting and stitching steps while improving product consistency and comfort. In the athleisure segment, this one-piece knitting capability supports more complex pressure-gradient designs, directly enhancing athletic performance.
However, the release of these benefits depends on the actual purchase and commissioning pace of warp knitting mills. KARL MAYER equipment is typically priced high, and the RJ 4/2 EL’s higher level of electronic integration means higher initial investment and maintenance costs. Whether small and medium-sized mills can absorb this investment in the short term is a key variable determining when this new technology will truly impact the end market.