Expanded metal and process of making the same

a metal and process technology, applied in the field of expanding metal and process of making the same, can solve the problems of premature failure of the filter, inability to obtain consistent pleats, and uneven height of the pleated filter, so as to reduce the long direction, reduce the long dimension, and reduce the long direction

Active Publication Date: 2012-06-14
WALLNER EXPAC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, consistent pleats are not obtained, as some pleats after being formed spring back more than others.
Another problem with filters incorporating conventional expanded metal is that the pleated filter has pleats which do not have consistent heights.
As a result, the pleats have an increased chance to collapse during filtering due to the air pressure acting on the filter, resulting in premature failure of the filter.
Furthermore, there are less contact points between the pleat peaks and bonds, thus, causing filter fluttering or possible pleat collapsing, which can reduce filter optimal performance.

Method used

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  • Expanded metal and process of making the same
  • Expanded metal and process of making the same
  • Expanded metal and process of making the same

Examples

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Embodiment Construction

[0022] Applicants have discovered that they can produce a stronger lighter weight expanded metal which has minimum, or no consistent spring back, or no spring back at all, after bending and thus, when attached to a filter material and pleated, has less tendency to want to return to its original unfolded position. In addition, Applicants have discovered that use of such expanded metal results in pleats having more consistent height, thus having minimal or no high / low variations in the pleat height.

[0023] In one exemplary embodiment, Applicants produce such inventive expanded metal by further stretching the expanded metal after it is formed. This is accomplished by increasing the feed rate through the flattening rolls 18 relative to the feed rate existing through the feeder or expander 16. Such further stretching may also be accomplished due to an increase in the pull generated by the flattening rolls against the base plate which is held by the cutting die as the cutting die shears th...

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Abstract

An expanded metal is provided including a plurality of integral strands defining diamond shapes, each diamond shape having a long dimension as measured from two opposing vertices and a short dimension, generally transverse to the long direction, as measured between two other opposing vertices, such that the long dimension is less than twice the short dimension.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is based upon and claims priority on U.S. Patent Application Ser. No. 61 / 246,943, filed on Sep. 29, 2009, the contents of which are fully incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] Expanded metal has many applications, as for example in air filters, ventilation systems, strainers, etc. Typically, expanded metal is formed by feeding metal sheet or plate (herein after referred to as “base plate”) 12 through feeders 14 which is then fed through an expander 16, where it is expanded to form expanded metal 15. The expanded metal is then fed through flattening rolls 18 and into a take-up spool 20, as for example shown in FIG. 1. The feeders 14 are shown in FIG. 1, by way of example, as rolls. The feeder may be any device that feeds the base plate 12 from its spool 22 to the expander. The feeder may also be part of the expander. The expander includes a support base 24 over which is advanced to the base p...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B01D39/10B21D31/04B32B3/10
CPCB01D2265/06B01D46/521Y10T428/12361B01D39/2041Y10T29/18B21D31/04
InventorWALLNER, MICHAELWALLNER, PAUL
OwnerWALLNER EXPAC INC