The invention relates to a filter system (10) including a filter element
(14) for filtering a fluid within a cylindrical case (12). The filter
element is an absorbent tissue paper material in the form of a sheet
compactly wound to form inner winding turns therein and to form a tubular
cylinder inside the case (12) in a manner to partition a radially outside
part (26) from a radially inside part (30). The axial ends of the filter
element are capped by the closed ends (18, 20) of the case. The inner
winding turns exhibit a contour which prevents the inner winding turns
from unraveling inward. In operation, the fluid moves across the filter
element (14) in a generally centripetal direction. The filter element (14)
is characterized in that it is devoid of a central core.
