Roof and rib skin control
Continuous coverage limits ravelling and local falls between installed support points through coal roadways and intersections.
Underground polymer mesh application contextUnderground coal · roof · rib · longwall recovery
High-strength woven Mine Grid for underground coal.
KMG is a coated, high-tenacity PET grid installed as a continuous surface membrane between the mine's designed bolts, plates and straps. It controls ravelling and broken roof or rib material while carrying local membrane loads into the designed support points.
Coal-mine strata control
A continuous skin-control layer across roof and ribs.
Mine Grid works with the mine's primary strata-control system. The grid spans between bolts, plates and straps, retains loose or fractured surface material and transfers membrane load back to those support points. It is used through development roadways, intersections, pillar wrapping and engineered longwall recovery zones.
Pillar and transition coverage
Flexible textile construction follows shoulders, ribs and irregular profiles without forcing a stiff sheet across changing geometry.
Longwall recovery
High-capacity grades can form the continuous reinforced screen carried over shield canopies near the planned finish of a longwall panel.
Why woven PET
The higher-capacity mine-grid pathway.
Extruded polypropylene grid is stiff and can feed cleanly through mechanised installation equipment. Woven KMG is selected where tensile capacity, conformity and continuous load-carrying coverage are the stronger priorities.
Far higher tensile envelope
High-tenacity filament bundles scale the KMG range from 60/60 to 800/800 kN/m without relying on thicker moulded ribs.
Conforms to coal-mine geometry
The flexible textile field follows uneven roof, shoulders and ribs and can drape through longwall recovery arrangements.
Balanced or directional capacity
Balanced grades resist changing load direction; directional grades concentrate capacity in the established governing axis.
Wide continuous coverage
Five-metre-wide rolls reduce panel joints and help maintain one coherent membrane field across the roadway profile.
Grade and support selection
The mine's ground model sets the system.
The mine's geotechnical or strata-control engineer selects and releases the KMG grade, warp direction, bolt or cable pattern, plates, straps, joints, terminations and monitoring requirements as one support package.
Ground behaviour
Ravelling, slabs, joints, weak bands, convergence, abutment loading and dynamic demand.
Roadway geometry
Roof and rib profile, tunnel width, intersections, exposure period and the area requiring continuous coverage.
Support span
Bolt rows, spacing, plates and straps establish the clear membrane span and how load reaches the support system.
Block retention
Expected fragment size and aperture compatibility; tensile strength cannot retain material that passes through the opening.
Load direction
Balanced grades suit variable demand; directional grades place the stronger warp in the governing membrane axis.
Service response
Allowable sag, convergence, access, equipment clearance, monitoring and the mine's TARP thresholds.
Design ownership
Product tensile data does not determine bolt spacing by itself. The installed response depends on ground behaviour, clear span, retained load, aperture, plates, straps, anchorage, allowable deformation and the mine's operating method.
Mine Grid documents
Technical data and field controls.
The technical schedule covers the six KMG grades, construction, selection inputs and longwall recovery use. The installation guide covers support design, handling, deployment, orientation, joints, repair, recovery work, inspection and QA records.
Underground coal projects