High-Precision Basis-Weight Gauges for Web Processes

Basis weight is measured by determining the mass per unit area of a material. Hammer-IMS uses contactless M-Ray millimeter-wave technology that measures material density and thickness simultaneously, calculating basis weight without physical contact. The system transmits electromagnetic waves through the material and analyzes the signal response, providing continuous real-time measurements across the full web width with multi-kHz sampling rates.

Yes, basis weight and GSM (grams per square meter) refer to the same measurement—the mass of material per unit area. While 'basis weight' is the general term used across industries, GSM is the most common metric unit. Some industries use alternative units like pounds per ream for paper or ounces per square yard for textiles, but all express the same fundamental property.

A basis weight test measures the mass per unit area of a sheet material to verify it meets specifications. Traditional tests involve cutting precise samples and weighing them on calibrated scales. Hammer-IMS automated gauges perform continuous non-destructive testing during production, providing instant basis weight measurements across the entire web width without stopping the line or requiring manual sampling.

Non-nuclear M-Ray technology eliminates radiation safety concerns, regulatory licensing requirements, and disposal complications associated with isotope sources. It provides equal or superior measurement accuracy while enabling 24/7 operation without radiation safety protocols. The technology is also unaffected by material color, maintains consistent performance over time without source decay, and supports immediate installation without regulatory approval delays.

Hammer-IMS M-Ray systems deliver measurement precision comparable to or exceeding traditional contact and nuclear methods. Accuracy depends on material type and thickness range, but typical systems achieve repeatability within ±0.5% for most applications. Multi-sensor configurations enhance accuracy by providing multiple measurement points, and advanced signal processing compensates for environmental factors like temperature and humidity variations.

Yes, our systems support multi-layer data processing for composite materials and laminated structures. The M-Ray technology can measure total basis weight of multi-layer assemblies and, with proper calibration, differentiate between layer contributions. This capability is particularly valuable in applications like coated papers, laminated films, and composite nonwovens where individual layer control is critical.

Hammer-IMS measurement systems accommodate line speeds up to 500 meters per minute (1,640 feet per minute) thanks to multi-kHz sampling rates. The high-speed measurement capability ensures adequate spatial resolution even at maximum production rates, providing detailed cross-directional profiles without compromising accuracy. For slower processes, the system delivers even higher measurement density for enhanced process control.

Our gauges provide multiple integration options including analog outputs, digital communication protocols (Modbus, OPC-UA, Ethernet/IP), and direct PLC connectivity. The systems support closed-loop control configurations that automatically adjust upstream equipment based on measurement feedback. Industry 4.0 connectivity enables cloud-based monitoring, remote diagnostics, and integration with enterprise manufacturing execution systems for comprehensive production intelligence.