Edge Crack Detection System
The Dual Edge System detects and marks paper edge defects, including fold-overs and non-separated edge cracks, resulting in improved runnability, reduced trim, and fewer paper breaks. The modular and easily customized system is configured using four modules:
The ECD-4000 edge crack detection module uses a unique, patented non-contacting detection method. High sped optical sensors combined with precision air jets detect edge cracks before they separate and become a fold or turnover. Two precise streams of air are directed toward opposite surfaces of the web. As a non-separated crack or tear passes through the sensor jaws, the defect is deflected to form a small opening for the optics to penetrate. The same air that deflects the crack closes it as it leaves the sensor. The deflection air is adjustable for various grades of paper.
The EMM-2000 edge marking module marks the top and/or bottom surfaces of one edge with any one of six colors, derived from only three dye tanks (thus eliminating unnecessary hardware). The system uses two spray nozzles to ensure a mark even if one becomes plugged. An automatic purge system cleans the marker internally. All wastewater and over-spray dye is collected and siphoned through a static vacuum pump to the sewer. During web breaks, the marker and vacuum pump are automatically purged with water for two minutes. The premixed dye is replenished in remotely located storage tanks.
The ETM-100 edge-tracking module maintains the position of the other modules on the edge of the moving web. The point of inspection is adjustable to within 3/16 in. of the edge. The system automatically retracts when a web break occurs. The module consists of an infrared edge sensor and a sealed electrical linear actuator. A local control panel allows for manual or automatic edge tracking.
The EBM-100 edge base module contains the support hardware and software for the system. It includes a mini-computer with a 24-button operator interface panel. Ample digital I/O allows for interfacing to existing process control equipment. Programs are maintained in EEPROM and battery back-up RAM. Software changes, free for the first year, are easily accomplished by swapping EEPROM modules. A 24-volt d.c. supply provides all control power for the system.
Ryeco Products & Services, 810-B Pickens Industrial Dr., Marietta, GA 30062. Tel: 770-423-0934, Fax: 770-424-2554.