Methods and apparatus to make concentric filters composed of two or more materials.

摘要

The present invention is a modification to conventional tow processing machinery 2 and filter rod making machinery 6 which utilizes a top crimper 4 and a bottom crimper 4a alone or in combination, or a crimper and two sources of tow in combination to allow the machinery to be capable of producing different types of filters without major structural changes to the existing machinery. <IMAGE>