In packaging, converting, assembly, bookbinding, nonwovens, footwear and many other markets, hot melt glues and adhesives offer a critical advantage: fast processing. Unlike water-based or solvent-based adhesives, hot melt adhesives do not require drying. Hot melts begin bonding almost immediately after application, as they cool down to their solidification point. This fast solidification is ideal for use on highly automated manufacturing lines that require rapid bond formation. Glue pillow manufacturers report increasing demand as customers move from drums to returnable/recyclable containers. While the moisture contained within the glue pillow is very low, problems occur when surface moisture on the pillow exterior accumulates during the manufacturing process prior to packaging for shipment.
The Near IR moisture transmitter is mounted 8-18” above the conveyor where it scans product only, with few gaps between pillows. An angle wedge or diverter may be installed that insures constant glue pillow product under the transmitter without slowing the overall product flow. The intention of measuring moisture on the glue pillow is not to determine absolute moisture but to determine when the surface moisture is within acceptable limits.
Samples of low, acceptable and high moistures are presented to the transmitter and it is scaled appropriately. For example, low surface moisture is assigned a value of 0, acceptable 3 and high moisture 5. The MCT460 features a 5.7” Operator Interface Display, 4-20 mA proportional analog output and optional Ethernet connection.