Global Footwear Industry Chain Latest Trends and Core Technology Path White Paper - Part 2

Core Causes: Continuous shear stress from heavy-load reciprocating bending in the field, and prolonged erosion of the adhesive layer by mud, water, and high humidity, leading to hydrolytic debonding.

1. Chemical Formula Upgrade

Select polycarbonate-type WPU emulsion combined with HDI/IPDI trimer curing agent; the main agent is synthesized from PCDL polycarbonate polyol, with hydrolysis resistance 5 times that of ordinary polyester systems; the curing agent addition is increased to 5%~6% to build a three-dimensional dense crosslinking network.

2. Atmospheric Plasma Treatment for Shoe Material Surface Interface Enhancement

The rubber outsole is paired with a chlorinated polypropylene (CPP) water-based primer and a vulcanizing agent for surface roughening; the EVA and PU midsoles are treated online with atmospheric plasma (power 900W, travel speed 120mm/s), where high-energy particles activate the material surface, generating hydroxyl and carboxyl polar groups to achieve covalent bonding.

3. Production Line Process Optimization

Precise temperature control in the activation stage at 80°C~85°C ensures optimal melt viscosity of the adhesive layer; a two-stage stepped pressure is applied: 0.2MPa low pressure for 3 seconds to expel interfacial air, followed by 0.5~0.6MPa high pressure held for 10~12 seconds to promote interpenetration and entanglement of polymer chains.

Core Cause: Long-term high-frequency foot traffic leads to plastic deformation of the microporous structure, rupture of bubbles, and collapse of closed pores, resulting in permanent loss of rebound.

1. Base Material Molecular Modification

In the synthetic PEBA raw material stage, increase the proportion of PA11/PA12 hard segments, relying on the hard segments for structural support while the soft segments provide elastic deformation; during the polymerization process, add 0.5%~1% modified PVDF nanospheres/graphene as heterogeneous nucleating agents, refining bubble sizes from 50μm to 10–20μm; the bubble structure is dense and uniform, with permanent compression deformation <8%.

2. Upgraded Supercritical Foaming Process with Dual-Stage Pressure Relief

Introduce the RHCM mold rapid cooling and heating system: maintain a melt temperature of 140℃ during filling to ensure fluidity, with the mold temperature dropping to 50℃ during pressure relief to lock in the bubble structure and suppress the merging of bubbles; adopt a dual-stage pressure relief process, first reducing pressure to the critical balance point, then smoothly releasing residual pressure to minimize the density difference between the midsole surface and core layer bubbles (gradient difference <5%).

3. Gradient Composite Structure Design

Dual-layer composite structure: the upper layer uses high-rebound PEBA (rebound >82%) to enhance foot feel; the lower layer is composed of 5~8mm high fatigue-resistant supercritical TPEE/EVA materials, absorbing landing impacts and protecting the upper microporous structure, effectively extending the midsole's lifespan.

To help global brands and manufacturing enterprises overcome process challenges such as adhesive failure and midsole degradation, and accurately seize opportunities in industrial technology iteration, GISMA GUANGZHOU 2027 has planned three major concurrent activities to connect the entire chain from R&D innovation to mass production.

1. Supercritical Foaming Closed-Door Technology Matching Session

2. European Green Compliance Forum (Eco-Design Forum)

3. Global Supply Chain Matching Session・Cross-Border Small Order Quick Response Zone

The organizers are collaborating with shoe industry associations from Vietnam, Indonesia, and India, suggesting that supply chain leaders and shoe factory technical teams from various footwear brands plan their trips in advance to visit the Poly World Trade Center Expo in Guangzhou from May 27 to 29, 2027, to observe live demonstrations of intelligent shoe machinery and finalize core procurement plans for raw and auxiliary materials for the 2027-2028 period.

The global footwear industry competition has moved beyond superficial comparisons in appearance design and marketing, officially entering a deeper competitive phase focused on molecular modification of materials and intelligent manufacturing engineering. Companies that strategically invest in core technologies such as polycarbonate-based waterborne adhesive systems, plasma interface activation, microporous high-hardness PEBA materials, and dual-stage pressure-controlled supercritical foaming can systematically address two long-standing pain points: adhesive failure in walking shoes and midsole degradation in racing shoes.

Relying on the GISMA GUANGZHOU 2027 global industry exchange platform, upstream and downstream enterprises can engage in deep collaborative innovation, strategically positioning themselves in the single material (Mono-material) full cycle and seamless green manufacturing track, thereby building a long-term competitive advantage amid the global low-carbon transformation wave in the footwear industry.