METHOD OF AND MACHINE FOR MAKING FILTERS FOR ROD-SHAPED SMOKERS' PRODUCTS

摘要

Two or more tows of fibrous filter material are simultaneously advanced along neighboring paths through several processing units into a rod forming unit to be converted into filter rods which are ready to be subdivided into filter rod sections of unit length or multiple unit length, at least one of the processing units is designed to simultaneously treat all of the tows, and at least one of these units is designed to treat the tows independently of each other, such independent treatment renders it possible to eliminate differences between the characteristics of the ultimate products or to intentionally impart to products obtained from different rods different characteristics such as density and/or the resistance to the flow of tobacco smoke, the plural tows can be withdrawn from a single source storing a discrete bale for each tow, a common bale for several tows or a bale having a tow of multiple unit width which is subdivided into several narrower tows not later than at the time of entering the unit or units which are designed to individually treat each tow on its way toward the rod forming unit, the tows can be advanced side-by-side in a common plane or in several planes above each other.