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JEC World 2026: second-day impressions — Corex, Greene Tweed DLF, Double-Double, and thermoplastic braiding

Industry News2026-02-03

Day two at JEC World 2026 caught my attention on material strategy, discontinuous long-fiber (DLF) applications, laminate design, and thermoplastic braiding. Here's a quick overview.

1. Corex: the material strategy — reducing complexity at the molecular level

Corex presented a clear vision for thermoplastic composite processing built around one idea: integration performance in industry depends on stability, not peak properties. In practice, that means choosing matrices that are predictableacross real-world process variation.

Semi-crystalline polymers (PE, PP, PA at the commodity end; PEEK, PPS at the high-performance end) dominate the plastics industry because crystalline order boosts stiffness, strength, creep resistance, and chemical resistance. The downside is crystallization kinetics: the microstructure evolves with temperature, pressure, and cooling rate. Each phase transition widens the set of parameters that must be controlled and increases sensitivity to thermal history and forming conditions. In processes like AFP, that translates into narrow process windows and strict thermal management. Poor control can lead to multiple crystal forms (e.g. different polymorphs in PEEK), secondary crystallization, and aging at room temperature — with consequences such as warpage, dimensional drift, or even crack formation long after the part is made.

Amorphous polymers remove that source of variability. With no crystallization, the material stays single-phase through processing; behaviour is much less sensitive to cooling rate and thermal history. Wider processing windows and more predictable properties make amorphous matrices — such as PC, PPSU, PEI — a more reliable choice for many TPC processes where control of crystallinity is difficult. Corex’s message: integration performance starts with molecular stability; for industrial TPC processing, amorphous systems often deliver the stability that semi-crystalline systems cannot guarantee at scale.

2. Greene Tweed: Xycomp DLF — lightweight aerospace and industrial DLF parts

Greene Tweed showcased Xycomp® DLF™ in the context of high-performance, lightweight components for aerospace and industrial markets.

Xycomp DLF is a high-strength thermoplastic composite made from aerospace-grade unidirectional carbon fiber prepreg tape that is chopped into controlled flakes. These provide high fiber content (up to 70% by weight), long fiber lengths for excellent mechanical properties, and allow for highly controlled fiber orientation. The flakes are then compression molded using Greene Tweed’s proprietary process to create complex 3D parts with integral features—including bosses, inserts, and fastener holes—enabling part consolidation and efficient raw material utilization. Target applications include engine components, brackets, structural supports, and other aerospace- and industrial-grade parts that benefit from exceptional strength-to-weight ratio, fatigue and impact resistance, and up to 60% weight savingscompared to metal alternatives. Notably, Xycomp DLF is the enabling technology behind Greene Tweed’s award-winning thermoplastic composite jet engine vane, which features significant mass reduction and design flexibility for the aviation industry.

Greene Tweed demonstrated multiple DLF brackets with up to 86% weight savings versus the original metallic design. The same DLF and compression-molding approach is the basis of their stator guide vane for jet engines: chopped UD prepreg (PEEK, PEKK, or PEI), no autoclave, compression molding with controlled flow (ColdFusion/HyFusion), co-molded metal leading edge for impact and erosion, and ~4 kg weight saving per enginewith ~60% mass reduction at the part level.

3. Prof. Tsai: new insights on Double-Double laminates

Prof. Tsai’s Double-Double (DD) laminates were discussed with updated emphasis on homogeneity, fatigue, manufacturing, and design freedom.

DD laminates are homogeneous through the thickness (same repeating sublaminate), in contrast to heterogeneous quad(e.g. classic 0/±45/90) stacks. That homogeneity brings much higher fatigue resistance because of minimal splitting and edge delamination — the uniform layup avoids the interfaces and stress concentrations that drive early damage in heterogeneous stacks. Design is flexible: any thickness can be achieved by repeating the DD sublaminate, and ply dropsare straightforward — single exterior ply drops preserve the constant (homogeneous) properties of the remaining stack. With quad, ply drops typically require internal drops in pairs and mid-plane symmetry to avoid coupling and property shifts; DD avoids that constraint.

Manufacturing benefits were highlighted: simple ply drops and a single exterior drop strategy keep the process simple while maintaining integral homogeneous behaviour. On the design side, DD layups allow a simple implementation of negative CLTE (coefficient of linear thermal expansion) laminates: by controlling ply angles, negative Poisson’s ratios can be achieved, enabling control of interface fits with temperature and mechanical load — useful for tight-tolerance assemblies and morphing or adaptive structures.

4. Thermoplastic braiding: two routes to TPC preforms

Thermoplastic braiding appeared as a distinct theme — moving beyond the familiar route of dry fiber braids as preforms for RTM or infusion with thermosets. At least two approaches are emerging for thermoplastic braided preforms.

First approach: Slit UD tape into very narrow strips, commingle the strips into a yarn, and braid the yarn into a preform. The preform is then compression molded or overmolded to produce the final thermoplastic composite part. This route keeps high fiber content and alignment from the UD tape while enabling braided geometries.

Second approach: Use commingled yarns (reinforcing fibers — carbon or glass — plus polymer fibers) to build a braided preform directly. The preform can be consolidated by heating and pressure. This is well suited to TPC tubeswith varying cross-section, complex curved tubular shapes, and other hollow or closed profiles that are difficult to make with flat laminates or AFP. Both routes extend braiding from thermoset preforms to fully thermoplastic parts and open the way to complex 3D fiber architectures in TPCs.

Summary

Main obesrvations of the second day: Corex’s argument that amorphous matrices reduce process variability and widen processing windows for TPCs; Greene Tweed’s expansion of Xycomp DLF and ProFusion from engine brackets to stator vanes, with the same weight-saving and consolidation story; Prof. Tsai’s Double-Double as a homogeneous laminate option with better fatigue, simpler ply drops, and negative Poisson’s ratio design; and thermoplastic braiding as an emerging route to 3D TPC preforms via slit-tape commingling or commingled yarns, for compression-molded or overmolded parts and tubular structures.

Tag： laser-assisted thermoplastic Automated Fiber Placement (AFP) system TPC

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JEC World 2026: second-day impressions — Corex, Greene Tweed DLF, Double-Double, and thermoplastic braiding

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