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Moisture Measurement in Oriented Strand Board  

Moisture content control is critical in the manufacturing of consistent high quality Oriented Strand Board. The mat moisture content and its distribution influence the consolidation of the OSB panel in the Press. If moisture levels are too high, the resin will not bind sufficiently to the wood and de-lamination will occur. At very low moisture levels, uneconomic usage of expensive resins results. In addition, over drying is undesirable due to increased fuel costs, increased fines, greater wastage, and potential for flash fires.

OSB Production
Logs are slashed, soaked, then debarked, prior to being cut into strands ranging from 3.5” to 6” in length, and 1” in width then stored in wet bins. The strands are then dried, screened, and blended with a binder and wax, before entering the Former where the mats are laid down. OSB consists of 3 or more layered mats, strands are aligned longitudinally within the surface layers, and are crossed or randomly aligned within the Inner Layers. The mats are converted to panels under high pressure and temperatures within the Press.

Measurement Location
Measurements are made at all or some of the following locations;

On the green wood before it enters the dryer, for example through a viewing window in the side of a storage bin. This provides information on the dryer load and enables feed forward control of the dryer.

*Post dryer, on the weigh belt prior to the Blender. The measurement at this location is not easy owing to non-equilibration of the product. It is often used as an indicator of moisture level rather than an absolute moisture measurement, the aim being to narrow the final strand moisture content through tighter dryer control.

At the exit of the Blender

On the Forming line

Gauge Installation
Processes vary. Correspondingly, there is a variety of options available for mounting the gauge. The sensor can be mounted 8” from a continuous flow of product on a conveyor belt, and can also be located looking into a gravity chute or bin, through a viewing window, or insertion probe.

 
 
Measurement Performance
Measurement Location Target(% Dry Weight) Typical Accuracy
Pre Dryer on green flakes 60-150% +/- 1%
Exit of Dryer 0-5% See *
Exit of Blender 5-10% +/- 0.3%
Forming line 5-10% +/- 0.3%
 
 
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  Process Sensors Moisture Transmitters

MCT 460: Used in a wide variety of industrial processes, the MCT 460 Multi-Constituent NIR Transmitter, a True Stand-Alone Transmitter, provides off-line accuracy under on-line operating conditions. Read more about the MCT 460 moisture sensors...

MCT 460-T: The MCT 460-T measures moisture... the most critical variable in tobacco processing... providing the world's most accurate, reliable and stable moisture measurement for the tobacco industry. Read more about the MCT 460-T moisture measurement tool...

MCT 460-WP: The MCT 460-WP uses a well proven algorithm which works on a wide range of wood varieties and forms. You choose the mode of operation, stand-alone or networked. Read more about the MCT 460-WP moisture measurement tool...

MCT 330HD: The MCT 330HD features a heavy duty stainless steel enclosure, is resistant to high temperatures, is sealed for wash down environments, and provides reliable, continuous moisture measurement. Read more about the MCT 330HD moisture measurement tool...

MCT 466-SF: The MCT 466-SF features a food grade optical window, a robust stainless steel enclosure, and reliably operates in high temperature locations, measuring moisture, oil & product temperatures. Read more about the MCT 466-SF moisture measurement tool...

MCT 466 QuikCheck: Used for quality control in a wide variety of industrial processes, the MCT 466 QuikCheck bench top NIR Tester provides fast accurate results every time. Read more about the MCT 466 QuikCheck moisture analyzer...

GUARDIAN: The Guardian Scanning Frame System is comprised of three components: MCT-460 NIR Transmitter, the automated Scanning Frame and a PC with Automated Guardian Profile Software. Read more about the GUARDIAN Scanning Frame System...