FILTER AND PROCESS FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a filter of the type provided with a piece 11 of a covering material for enclosing filter materials 1-4 and 12 and a piece 7 of covering paper provided on the periphery of the piece 11 of the covering material in which the piece 7 of covering paper has at least one window 8 or 9, and a process for producing the filter. SOLUTION: The filter is covered with the piece 11 of the covering material formed in a transparent state for at least one section. The process for preparing the filter comprises process steps of feeding the piece 11 of the covering material transparent for at least each section and a step of introducing the filter materials 1-4 and 12 in preselected amounts into the piece 11 of the covering material.