When a warp knitting machine can weave varying tension and breathability zones into a single fabric based on the pressure needs of different body parts, the fabric is no longer just a piece of cloth—it becomes a programmable wearable solution. KARL MAYER's new RJ 4/2 EL is precisely targeting this direction.
Core of the Upgrade: From Zonal Weaving to Functional Customization
The RJ 4/2 EL belongs to the RASCHELTRONIC® family, featuring electronically controlled jacquard guide bars that allow independent needle selection. This means density, structure, and even pattern gradients can be created in both warp and weft directions during knitting, without stopping the machine to change guide bars or relying on post-finishing for local effects.
For smart lingerie, this translates to shoulder straps that can be knitted tighter for support while cup edges remain soft and conforming. For sportswear, the front and back of a compression legging can have different pressure gradients to optimize muscle support and blood flow. This technological path upgrades functional zoning from 'stitched patchwork' to 'integral knitting,' reducing seam friction points and improving wear comfort.
Industry Impact: How Brands and Mills Will Respond
KARL MAYER's July 2026 release timing is telling. The global athleisure market continues to grow, especially in yoga, running, and cycling segments where a 'second skin' feel is increasingly demanded. Brands are no longer satisfied with standard elastic fabrics; they want bespoke knitting solutions for different styles, sizes, and even genders.
The RJ 4/2 EL directly addresses this. For China's warp knitting clusters—such as Changle, Shaoxing, and Hai'an—this equipment change means two things: first, high-end OEMs must assess whether existing machines can handle increasingly complex brand specifications; second, process engineer training costs will rise as machine setup shifts from mechanical parameters to electronic pattern files.
Potential Supply Chain Implications
From a cost perspective, the electronic jacquard system raises the fixed investment bar. A single RJ 4/2 EL is expected to be priced at the high end of its class, but for mills focused on differentiated customization, the added value per meter may cover depreciation—provided order volumes justify utilization.
On the raw material side, zonal knitting demands higher yarn uniformity and strength. If one section requires high-density knitting while an adjacent section is a sparse mesh, yarn tension fluctuations can increase breakage rates. High-quality polyester, nylon, or elastic yarn suppliers will benefit.
From a design perspective, brand development cycles may shorten. Previously, sampling required repeated adjustments to post-finishing or lamination; now, modifying the electronic pattern file is enough for trial knitting on the sample machine. This helps fast-fashion supply chains compress the time from design to first sample.