Explore our engineering-grade heavy machinery designed for heavy-duty paving, spray sealing, and binder logistics.
Founded in 1998 as Xi'an Hongda Communications Technology Co., Ltd. by distinguished engineering professors from Chang'an University—China’s premier institution for highway engineering R&D—HEM Group has pioneered high-end road construction and maintenance machinery for over two decades.
Recognized as an official "High-tech Enterprise" by the Shaanxi Provincial Department of Science and Technology in 2006, our institution holds scores of invention patents in mechanical dynamics, engine power matching, hydraulic transmission technology, and digital electronic control systems.
In 2017, to serve international procurement demands directly, HME TOP Machinery Equipment Co., Ltd. was established as our global trade, technical support, and export execution arm. Today, our engineering solutions span the entire lifecycle of civil infrastructure—from aggregate crushing to automated bitumen emulsion spraying and micro-surfacing paving.
An in-depth whitepaper on bitumen emulsion chemistry, automated metering mechanics, and thermal insulation engineering for highway maintenance contractors and municipal procurement officers.
Modern bitumen emulsion application demands exact volumetric distribution (measured in kg/m²). HEM Group's asphalt emulsion sprayers utilize high-resolution radar speed sensors combined with CAN-bus computer controllers. As vehicle ground speed varies, the proportional hydraulic pump automatically adjusts emulsion flow rates to maintain binder application variance within < ±1.5%.
Asphalt emulsions (CRS, CMS, SS grades) break prematurely if subjected to localized overheating or extreme cold pockets. Our units feature thermal oil jacketed asphalt pumps and heating coils powered by automated diesel burners. Heat transfer oil prevents thermal shearing, preserves emulsion stability, and guarantees smooth spraying upon startup.
To eliminate "streaking" or uneven coat distribution on prime coat and tack coat operations, our pneumatic triple-folding spray bar maintains exact nozzle spacing and spray angle geometry. Individual pneumatic nozzle controls allow operators to adjust spray width dynamically from 0.2m up to 6.0m directly from the ergonomic cab interface.
Selecting the appropriate sprayer specification depends on project scope, binder chemistry, and field climate. Below is an engineering overview of parameters supported by HME TOP equipment:
| Operation Type | Recommended Binder Grade | Application Rate (kg/m²) | Spraying Temp (°C) | Key Machine Feature Required |
|---|---|---|---|---|
| Tack Coat (Inter-layer Bond) | Rapid-Setting Cationic (CRS-1 / K1-40) | 0.3 – 0.6 | 50°C – 65°C | Pneumatic nozzle micro-metering & auto-speed tracking |
| Prime Coat (Granular Base) | Slow-Setting Anionic/Cationic (SS-1 / CSS-1h) | 0.9 – 1.5 | 40°C – 60°C | Deep-penetration high-pressure spray manifold |
| Synchronized Chip Sealing | Polymer Modified Emulsion (PMCRS-2) | 1.2 – 2.2 | 65°C – 80°C | Synchronized aggregate-binder release mechanisms |
| Fog Seal / Slurry Seal Prep | Diluted Emulsion (CSS-1 / QS-1h) | 0.2 – 0.4 | 35°C – 50°C | Fine atomization nozzles with anti-drip check valves |
Why international contractors and fleet managers partner with HME TOP for high-yield road maintenance equipment investments.
Every road agency operates under unique environmental conditions—from high-altitude passes in the Andes to high-humidity tropical corridors in Southeast Asia. HME TOP leverages localized modular engineering, offering custom chassis integration (Sinotruk, ISUZU, FAW, MAN, or trailer-mounted configurations), custom tank capacities (3,000L to 18,000L), and specialized dual-burner thermal oil systems.
By coupling Chang'an University's advanced hydraulic research with China's robust industrial supply chain, HEM Group delivers premium machinery at highly competitive capital expenditure levels. High-durability stainless steel tank inner layers, heavy-duty asphalt pumps, and globally accessible hydraulic components ensure minimum lifecycle maintenance downtime.
Exporting heavy machinery to over 60 countries requires strict compliance with regional emission standards, safety regulations, and operational environments. HEM Group machines meet Euro V and EPA Tier 4 Final emission requirements and hold comprehensive CE certification for European and South American tenders.
To eliminate field downtime, HME TOP maintains dedicated technical assistance teams, local service centers, and regional spare part hubs across strategic global locations:
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Every equipment assembly undergoes 100% hydrostatic, hydraulic flow, and thermal stress testing before export dispatch.
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How smart telematics, decarbonized heating, and automated robotics are reshaping asphalt spray operations worldwide.
Modern road authorities increasingly demand digital proof of application quality. HME TOP sprayers incorporate cloud-connected IoT telemetry that logs spraying temperature, exact volumetric application rate per square meter, GPS coordinates, and vehicle speed—allowing live compliance verification from central project dashboards.
Transitioning away from direct fossil fuel burner heating, modern asphalt emulsion distributors are adopting clean burner technologies and electric heat-element maintainers powered by auxiliary generator banks to cut jobsite emissions and operational fuel costs.
The integration of synchronized binder spraying with aggregate spreading in a single pass minimizes traffic interruption and enhances bonding chemistry performance during thin-overlay asphalt preventative maintenance cycles.
Expert answers to common engineering, procurement, and operational queries regarding asphalt emulsion sprayers and road maintenance machinery.
While both machines apply bituminous binders, an asphalt emulsion sprayer is specifically engineered to handle water-asphalt emulsions (cationic and anionic) without causing mechanical shearing or premature break (separation of water and asphalt). Emulsion sprayers feature thermal-oil jacketed asphalt pumps, specialized low-pressure atomizing nozzles, and precision heating controls to prevent chemical breakdown, whereas standard hot-bitumen distributors focus strictly on high-temperature (160°C–180°C) straight asphalt cement.
Our automatic sprayers use radar sensors or transmission encoder units to measure exact ground movement speed. The signal is processed by an onboard CAN-bus controller, which continuously adjusts the displacement of a variable hydraulic pump driving the bitumen pump. If the driver speeds up or slows down, the fluid flow changes dynamically, maintaining a uniform application rate (e.g., 0.5 kg/m²) across the entire road surface without manual intervention.
Yes. Our heavy-duty spraying equipment options feature reinforced high-viscosity asphalt pumps, expanded heat transfer oil (HTO) jackets, and heavy-duty spray bar heating lines capable of circulating high-viscosity binders such as SBS polymer-modified asphalt and crumb-rubber modified bitumen at elevated application temperatures.
Our sprayer modules are engineered for universal chassis compatibility. We offer factory integration with Sinotruk (HOWO), FAW, Shacman, ISUZU, MAN, Mercedes-Benz, and Volvo chassis. Alternatively, we can export skid-mounted or trailer-mounted units with independent auxiliary diesel engines for local customer mounting.
HME TOP provides comprehensive global technical assistance. We dispatch experienced mechanical and electronic field engineers directly to project sites worldwide to perform machinery assembly, calibration, trial spraying, and complete operator safety certification training.
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HME Machinery