Patent ID: 8696783
Filing Date: 2014-04-15
Classification: A62B,B01D,B29C,B29L

Abstract:
1. A method of forming a filter unit comprised of a filter element and an encircling peripheral encasement frame to which the filter element is sealed comprising the steps of: (i) providing a filter element having upper and lower faces and a bounding peripheral edge, (ii) locating around the peripheral edge of the element a mould unit which seals against peripheral regions of the upper and lower faces and which together with the peripheral edge and marginal regions of the upper and lower faces of the filter element defines a mould cavity, (iii) filling the mould cavity with a liquid curable resin system, (iv) effecting conversion of the liquid to a solid, and (v) removing the mould thereby producing the filter element; characterized by said mould unit having tapering projections extending around the entire periphery of the filter element that bite into said peripheral regions of the upper and lower faces so as to cause a slight depression therein.