Direct factory-engineered machinery backed by decades of Chang'an University academic expertise.
HEM Group was established in 1998 by a distinguished group of professors from Chang'an University—China's premier university for highway engineering, pavement science, and machinery research—alongside leading experts in the road building industry. Originally operating as Xi'an Hongda Communications Technology Co., Ltd., HEM Group represents the earliest high-tech enterprise dedicated to independent research, thermodynamic modeling, and precision design of high-performance road construction machinery in China.
Since its inception, the company has adhered strictly to the principle of being guided by cutting-edge high-tech R&D while creating an international benchmark for Chinese engineering machinery. Our research institutes focus on high-end road maintenance equipment, securing scores of invention patents across mechanical dynamics, engine power matching, high-shear fluid mechanics, hydraulic transmission control, and digital electronic automation. In 2006, HEM Group was formally designated a national "High-tech Enterprise" by the Shaanxi Provincial Department of Science and Technology.
In 2017, to expand international technical collaboration and deliver streamlined procurement for global contractors, HEM established its specialized export branch, HME TOP Machinery Equipment Co., Ltd. This division oversees international engineering exchanges, direct export operations, global spare parts distribution, and on-site technical deployment.
Understanding Rheological Behavior, High-Shear Homogenization, and Performance Grade (PG) Optimization for Heavy-Duty Pavements.
Modern highway infrastructure demands pavement binders capable of withstanding extreme environmental stresses, heavy axial loading, and high traffic frequencies without succumbing to rutting, fatigue cracking, or thermal distress. Straight-run paving bitumen frequently fails under high temperature variations due to its viscoelastic limitations. Polymer Modified Bitumen (PMB) solves these structural vulnerabilities by blending synthetic elastomers or plastomers into base asphalt binder.
When polymers such as Styrene-Butadiene-Styrene (SBS), Atactic Polypropylene (APP), or Crumb Rubber (CRMB) are dispersed into bitumen at precise thermal ranges (170°C to 190°C), they swell by absorbing light aromatic oil fractions. This creates a continuous polymer network within the maltene matrix, elevating the binder's softening point, increasing elastic recovery (>90%), and broadening the Performance Grade (PG) operating window from arctic cold to tropical heat.
The performance of PMB is governed directly by physical phase stability and polymer particle morphology. Simple mechanical stirring is incapable of breaking down elastomeric polymer pellets into micron-scale particles. Premium Chinese polymer modified bitumen plants—such as those designed by HME TOP Machinery—utilize ultra-high shear homogenizers operating at peripheral velocities exceeding 30 m/s.
Our proprietary dynamic-static rotor shear technology subjects the polymer-bitumen matrix to intense hydraulic tearing, micro-cavitation, and high-frequency mechanical impact. This reduces SBS domain sizes to under 2 to 5 microns, guaranteeing long-term storage stability without polymer phase separation (Storage Stability / Difference in Softening Point < 2.5°C after 48 hours at 163°C).
Optimized linear and radial SBS polymer incorporation for highway asphalt layers requiring extreme elasticity and rut resistance.
Eco-friendly high-viscosity modification using recycled scrap tire rubber to improve noise reduction and fatigue life.
Integrated Siemens PLC touchscreen systems with real-time temperature, mass-flow metering, and continuous shear monitoring.
Why leading international contractors choose Chinese OEM solutions for large-scale infrastructure investments.
China hosts the world's most concentrated industrial supply ecosystem for pressure vessels, precision shears, thermal oil boilers, and hydraulic components. This allows manufacturers to deliver world-class PMB plants with significantly reduced lead times.
By bridging academic breakthroughs from Chang'an University with industrial production, Chinese manufacturers rapidly commercialize innovations such as multi-functional SBS/Rubber dual-purpose plants and warm-mix additive injection systems.
Compared to European legacy OEMs, China-manufactured PMB equipment offers up to 40% capital expenditure savings while delivering equal or superior shear energy, energy efficiency, and operational durability.
Tailored modified asphalt formulations for demanding climatic and structural requirements worldwide.
High-volume commercial trucking corridors suffer severe shear stresses. Polymer Modified Bitumen prepared via high-shear plants increases pavement stability, reduces rut depth under 60°C summer pavement temperatures, and delays structural rehabilitation cycles by up to 8 years.
Aircraft landings inflict high impact forces and fuel spillages. SBS-modified asphalt binders provide superior shear strength, jet-fuel resistance, and low temperature flexibility (down to -30°C) to prevent thermal cracking on critical airport surfaces.
Orthotropic steel bridge decks require ultra-high-viscosity modified asphalt (HBMA) to ensure flexural compliance and complete impermeability against moisture intrusion, preventing structural deck corrosion.
From the Middle Eastern deserts experiencing 70°C surface thermal spikes to sub-zero high-altitude regions, custom-blended PMB extends binder ductility and prevents oxidative aging caused by high UV exposure.
Delivering complete equipment chains for earthmoving, paving, road maintenance, and aggregate processing.
Beyond specialized modified bitumen production facilities, HME TOP Machinery provides a total, integrated engineering fleet. Our continuous R&D chain covers every step of highway lifecycle management—from initial site excavation to asphalt production, paving, synchronized surface treatment, and cold in-place recycling.
Factory with over two decades of dedicated R&D and production excellence in highway engineering machinery.
Comprehensive technical guidance for pavement design, material formulation, and equipment operation.
Bespoke machinery engineering customized for unique mining, high-altitude, or extreme climate operations.
Round-the-clock online assistance, remote troubleshooting, rapid spare parts shipping, and on-site training.
Established service hubs and tech teams across Russia, Malaysia, South Africa, Uzbekistan, Ghana, Kenya, Indonesia, and Sri Lanka.
Complete end-to-end export handling including customs clearance, maritime logistics, and multilingual documentation.
Exported to over 60 countries across Asia, Africa, Oceania, and Latin America.
Our heavy machinery and polymer modified bitumen solutions are operational in key global markets including India, Sri Lanka, Indonesia, Nigeria, South Africa, Eritrea, Mozambique, Congo, Australia, Fiji, Bolivia, and beyond. We build enduring partnerships with regional contractors and government ministries.
Key evaluation parameters for international EPC procurement directors and highway agencies.
Prioritize suppliers offering multi-stage dynamic high-shear homogenizers rather than simple low-speed inline mixers. Insist on verification of micro-particle dispersion metrics via fluorescence microscopy to ensure SBS polymer phase stability.
Polymer degradation occurs when asphalt exceeds critical temperature thresholds (above 195°C). Ensure the plant incorporates automated dual thermal oil heating circuits with high-flow circulating pumps for even heat transfer.
For multi-phase highway contracts, containerized mobile PMB plants reduce installation timelines to under 5 days. Ensure components fit standardized ISO shipping frames to minimize sea transport freight costs.
Verify manufacturer ISO9001 quality management compliance, CE certification for electrical safety, and pressure vessel certification (ASME / GB standards) for thermal tanks and pressure reaction units.
Expert answers regarding polymer modified bitumen production, equipment specifications, and international orders.
The most widely used modifier is SBS (Styrene-Butadiene-Styrene), accounting for over 80% of highway modification projects due to its superior elastomeric recovery. Other popular modifiers include Crumb Rubber (CRMB), APP (Atactic Polypropylene), EVA (Ethylene-Vinyl Acetate), and specialized high-viscosity additives for porous friction courses.
Our high-shear mill rotors and stators are forged from high-chromium alloy steel and undergo precision laser heat treatment, offering exceptional abrasion resistance against high-viscosity modified asphalt mixtures. They deliver a service life exceeding 100,000 metric tons of PMB production before requiring re-sharpening or maintenance.
Yes! Our OEM Multifunctional Modified Asphalt Plants feature dual feeding channels and adjustable clearance high-shear mills specifically engineered to switch seamlessly between granular SBS polymers and coarse rubber crumb additives without clogging or system modification.
Standard production lead time is 20 to 35 calendar days. Equipment is pre-assembled, containerized, and bench-tested prior to dispatch. We provide remote video-commissioning support or send certified field technical engineers directly to your overseas project site for installation and local crew training.
Select from our market-leading series of specialized heavy machinery and asphalt plant systems.
HME Machinery