In Part 1, two major sources of chatter causing vibration were highlighted: chemistry and doctors. In this post, we examine the impact excessive moisture can have on Yankee chatter.
A high-volume, high-speed single facer at a corrugated packaging plant located in California (USA) was having issues with poorly bonded board after starting up from a stoppage of any duration. The poor bond between the corrugated medium and liner was resulting in excess waste and lost production.
Most thermocompressor sections are equipped with a non-condensable bleed (NCB) which are are applied to thermocompressor sections to prevent accumulation of non-condensable gases in the dryers.
Because energy drives the papermaking process, steam is found in many energy streams in a paper mill. Steam is used to cook fibers for improved sheet strength, heat stock for improved drainage, heat process air for ventilation, heat dryers to dry paper, and selectively heat the web for improved gloss and smoothness.