The launch of a new warp knitting machine is moving the concept of body mapping from prototype to mass production. KARL MAYER's latest RASCHELTRONIC model, the RJ 4/2 EL, is specifically engineered for fabrics with localized variations in stretch and breathability, targeting applications from smart lingerie to sporty athleisure.
For domestic warp knitting mills, the technical direction of this machine is worth close attention. It uses electronic jacquard technology to achieve variations in density, elasticity, and pattern within a single fabric piece, without requiring machine stops or comb changes. This means that the 'zone functionality' that previously required multiple processes of cutting and sewing can now be produced in one seamless operation.
Technical Breakthrough and Product Logic
The core of the RJ 4/2 EL lies in its electronic control capability. Traditional mechanical jacquard warp knitting machines require manual adjustments or stops for pattern changes. This new model allows designers to define jacquard instructions for each loop directly in CAD software and transmit data in real time to the machine. This 'what you see is what you get' workflow significantly shortens the time from design to sample.
From a product application perspective, the machine addresses a clear market pain point: consumer demand for intimate apparel comfort has upgraded from 'overall softness' to 'precise fit.' For example, a sports bra needs high elasticity at the shoulder straps for easy wear, high support at the underbust band, and breathable mesh structure at the side panels. Previously, such products required three different fabrics to be cut and sewn together. Now, the RJ 4/2 EL can knit them in one piece, reducing seams and improving comfort and durability.
Industry Impact: Opportunities and Challenges for Mills
For warp knitting clusters in China (e.g., Shaoxing, Changle, Wujiang), this technology upgrade presents both opportunities and barriers. Early adopters with digital knitting capabilities can build a competitive edge in high-end lingerie and sportswear fabrics. Open industry data shows China's high-end sports underwear market is growing at over 15% CAGR, with brands demanding faster sampling and flexible production.
Challenges lie in investment cost and talent. Electronic jacquard machines like the RJ 4/2 EL have a significantly higher unit price than conventional models. Moreover, operators need skills in CAD programming and digital pattern design. Currently, most Chinese mill technicians are trained in mechanical setup, leaving a gap in digital design-to-production integration. Early adopters may need to invest in training or partner with specialized design studios.
Implications for Brands and Buyers
From the brand perspective, this new machine lowers the barrier to producing complex body-mapping fabrics. Previously, developing a zoned functional fabric required multiple rounds of sampling with mills, taking months. Now, if a supplier has the RJ 4/2 EL, brands can directly provide digital pattern files for rapid sampling and mass production. This directly impacts product iteration speed, especially in categories like sports bras and shapewear where fit is critical.
Notably, the technology also contributes to sustainability. One-piece knitting reduces fabric waste from cutting and sewing, and lowers energy consumption in downstream processes. As EU and North American markets tighten requirements on textile carbon footprints, this feature could become a plus for export-oriented companies.