SIMULATION OF CORE BURSTS FOR OPTIMIZING WINDING SYSTEMS

Even today, core bursts constitute a problem which can prove greatly d etrimental to the productivity of the printer. Although on ultramodern printing machines of 3.48 m width or more, counterloading at the unwi nd more or less completely excludes the possibility of core bursts whe n the reel is cleanly wound, there are still enough printing machines in operation which are not so equipped, and on which core bursts arise , even on perfect reels. This paper deals with the various winding sys tems and winding parameters and briefly examines how they influence th e winding structure and affect the runnability of printing machines. T he road to improving a given winding system is long and cost-intensive , since it must inevitably pass through the printing works as well. Th is is why a means has been devised of simulating the unwind phase in t he printing works, giving the papermaker the opportunity of optimizing not only his winder and winding parameters, but also of adjusting the properties of his paper so that the can rest assured that his product is not likely to cause problems to the printer. This simulation has b een thoroughly tried and tested and is a sound indicator of what lakes place during the unwind phase.