A metering rod, also referred to as a coating rod, scraper, line rod or Mayer rod, is a high-precision measuring tool specially designed for industrial coating processes. Widely used in coating production lines and laboratory coating testing, it serves a broad range of industries including paper making, plastic film, adhesive tape and optical materials.
This professional coating tool allows precise regulation of wet coating thickness on substrate surfaces, delivering consistent micron-level coating accuracy. It has become an indispensable core component in all standard coating workflows.
Metering rods are generally manufactured from premium stainless steel via precision machining and professional surface treatment. Based on production techniques, they fall into two main categories: wire-wound metering rods and extruded metering rods.
Wire-wound metering rods create fixed grooves by winding stainless steel wires with different diameters. They boast a simple structural design and cost-effective performance for general coating applications.
In contrast, extruded metering rods adopt a cold extrusion molding process to form integrated continuous corrugated grooves directly on the stainless steel rod body. They stand out with outstanding benefits: no wire breakage risk, easy daily cleaning and ultra-high coating precision. Working on the principles of volumetric metering and hydrodynamic metering, extruded metering rods perfectly accommodate diverse coating demands, covering everything from laboratory R&D trials to large-scale industrial mass production.