A process for initiating a premature roll change of a web to be unwound from a roll wound on a spool, the process including the steps of measuring temperature at an end of the roll in a zone up to 150 mm away from a surface of the spool in a radial direction during a time that the roll has between 100% and 60% of its fully wound weight, using a non-contact measuring device, determining a radial distance from the spool surface when a temperature difference.gtoreq.0.5.degree. C. is found between temperature measurement locations in the zone and cooler adjacent areas, and storing the determined distance for triggering a signal that initiates a replacement of the roll when that distance is reached.
An active code carrier is located inside a spare paper roll that includes a tube or core. The code carrier interacts with either a reading head, or a writing head. This enables roll-specific data to be read or updated at any time. This is particularly useful for automated roll transport and roll handling systems.
The invention relates to a monitoring means (1) for an end of a thread-like material (2) wound on a storage coil (3), in particular an electrical conductor provided with an electrically insulating coating for a processing machine, comprising a computer unit (24) and a memory location (25, 26) for a desired residual quantity of the thread-like material (2). A weighing device (17 to 22) is provided for at least intermittently receiving the storage coil (3), the measured value transducer of which is connected to the computer unit (24) and a further memory location (25, 26) is provided for the tare weight at least of the storage coil (3).
A method for determining the quality of the formation of a reel or roll of a paper or board web and controlling the reel or roll formation or subsequent processing of the reel or roll based on the determined quality of the formation of the reel or roll. An oscillation signal produced by impulses formed in a web reel or roll during reeling or winding and arising from relative movements of web layers and/or from damaging of the web is measured and optionally stored. The measured signal is stored in electrical form as a function of time, reel/roll diameter, or the length of the web. The stored values are used in the control of the formation of reel or roll or in subsequent unwinding, reeling or winding of the reel or roll.
A quantity of material contained in a bank between a pair of calendering rolls is determined by digital imaging technology. Manipulation of digital images provided by a camera yields a light-hued image of material in the bank against a dark-hued background. The light-hued image is then divided into control zones associated with discrete regions of the bank fed by separate feed lines. Quantity and distribution of material in the bank can be controlled by adjusting feed rates based on information obtained through the digital images.
