Porous, continuously rotating band i.e. press felt, volume extending method for dewatering e.g. paper web, involves injecting chemical substance whose volume increases during heating and/or by effect of electromagnetic radiation, into band

摘要

The method involves injecting chemical substance, which are liquid or water soluble, into a porous, continuously rotating band (1), where volume of the chemical substance increases quickly during heating and/or by effect of electromagnetic radiation. The chemical substance is changed into gaseous state at a temperature range between 50 degree Celsius and 70 degree Celsius, where the chemical substance is formed from sodium hydrogen carbonate solution and carbon dioxide gas is developed during heating and/or by effect of electromagnetic radiation.