ON LINE FORMATION OF RECESSED CIGARETTE FILTER

摘要

A process for the on line production of cigarette filters comprises the steps of conveying a continuous thin flexible substrate (14) past a source (12) of smoke altering particulate material (10), such as adsorbents, catalysts and flavorants. An electrostatic charge is applied onto the substrate upstream of the source (12) of particulate material (10). A layer of particulate material (10) from the source (12) is deposited onto the substrate (14) with the thickness of the layer depending upon the strength of the electrostatic charge. The coated substrate is then cut into pieces (22), and the pieces (22) are placed into the cavities between spaced apart filter components (28). In an alternative process, filter paper is coated with smoke altering particulate material (108) by electrostatic deposition techniques, and spaced apart filter components (28) are placed onto the particulate coated filter paper which is then folded around the filter components (28).