Back to results
US 5,252,207 AGranted
Wrap member having openings
AssigneePall Corporation
InventorsJohn D. Miller, Kenneth M. Williamson, Joseph R. Swiezbin
Life of this patent
Estimating the term…
Abstract
A filter includes a pleated filter element having longitudinally extending pleats and a wrap member wrapped around the filter element. The wrap member is joined to the peaks of the pleats and has openings for increasing the dirt capacity of the filter. The filter element may be a composite of a filter layer, upstream and downstream support and drainage layers, a cushioning layer between the upstream support and drainage layer and the filter layer, and polymeric beads on the downstream side of the downstream support and drainage layer. An extruded polymeric mesh may comprise one or both of the upstream and downstream support and drainage layers.
Claims37
A filter comprising:
- a pleated filter element having a longitudinal axis and including longitudinally extending pleats having peaks;
- and
- a wrap member comprising one or more strips wrapped around the filter element at least once and joined to the peaks of the peats so as to restrain movement of the pleats and having unobstructed openings for increasing the dirt capacity of the filter element, the openings having a total area less than about one-half of the total area of a circumscribing surface defined by the peaks of the pleats.
A filter comprising:
- a filter element having a longitudinal axis and including a porous filter layer having upstream and downstream sides, a porous upstream support and drainage layer positioned on the upstream side of the filter layer, a cushioning layer positioned between the upstream support and drainage layer and the filter layer and comprising a material smoother than the upstream support and drainage layer, a porous downstream support and drainage layer positioned on the downstream side of the filter layer, and a plurality of polymeric beads disposed in regularly spaced, parallel strips on the downstream side of the downstream support and drainage layer, wherein the filter element is corrugated to define pleats having axes which extend generally perpendicular to the beads and the beads have opposing portions within each pleat that are joined to one another;
- and
- a wrap member comprising one or more strips comprising a strip of material wound at least once around the filter element and joined to the peaks of the pleats so as to restrain movement of the pleats, wherein the wrap member has openings having a total area less than about one-half of the area of a circumscribing surface defined by the pleats.
A filter comprising:
- a pleated filter element having a longitudinal axis and including longitudinally extending pleats having peaks and comprising a filter layer having a first side, a porous support and drainage layer disposed on the first side of the filter layer, and a cushioning layer disposed between the filter layer and the support and drainage layer and including a material which is smoother than the support and drainage layer;
- and
- a wrap member comprising one or more strips wrapped around the filter element at least once and joined to the peaks of the pleats so as to restrain movement of the pleats and having unobstructed openings for increasing the dirt capacity of the filter element, the openings having a total area less than about one-half of the total area of a circumscribing surface defined by the peaks of the pleats.
A filter comprising:
- a filter element having a longitudinal axis and including longitudinally extending pleats having peaks and comprising a pleated composite having a filter layer, a support and drainage layer, and means disposed between the filter layer and the support and drainage layer for resisting abrasion of the filter layer by the support and drainage layer;
- and
- a wrap member comprising one or more strips wrapped around the filter element at least once and joined to the peaks of the pleats so as to restrain movement of the pleats and having unobstructed openings for increasing the dirt capacity of the filter element, the openings having a total area less than about one-half of the total area of a circumscribing surface defined by the peaks of the pleats.
A filter comprising:
- a porous, pleated filter element having a longitudinal axis and having first and second ends and longitudinal pleat axes extending between the first and second ends, wherein the pleated filter element includes a composite having first and second layers, the first layer including a filter medium, and wherein each pleat includes an open end, a bight end, a peak, and opposing sides which extend between the open end and the bight end;
- a plurality of polymeric beads which extend along the second layer opposite the first layer and generally perpendicular to the pleat axes, wherein each bead extends from the open end of the pleat along the first side to the bight end and from the bight end along the second side to the open end and wherein the portions of each bead which extend along the first and second sides are joined to one another;
- first and second end caps joined to the first and second ends of a pleated filter element;
- and
- a wrap member comprising one or more strips wrapped around the filter element at least once and joined to the peaks of the pleats so as to restrain movement of the pleats and having unobstructed openings for increasing the dirt capacity of the filter element, the openings having a total area less than about one-half of the total area of a circumscribing surface defined by the peaks of the pleats.
2 more elements
A filter comprising:
- a filter element having a longitudinal axis and including longitudinally extending pleats having peaks and comprising a pleated composite including first and second extruded polymeric mesh layers, a filtering layer positioned between the first and second mesh layers, a first cushioning layer positioned between the first mesh layer and the filtering layer, and a second cushioning layer positioned between the second mesh layer and the filtering layer;
- and
- a wrap member comprising one or more strips wrapped around the filter element at least once and joined to the peaks of the pleats and having unobstructed openings for increasing the dirt capacity of the filer element, the openings having a total area less than about one-half of the total area of a circumscribing surface defined by the peaks of the pleats.
Dependencies are inferred from the claim text.