Filter unit
AssigneeWalker Filtration Ltd
InventorsBrian Walker, Alan Hodgson
Life of this patent
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Abstract
A method of producing a filter unit, such as an air/oil separator, having a tubular filter element bonded at one end to an end cap, is proposed. The method includes the steps of: providing a tubular filter element and an end cap; melting a portion of the end cap; and embedding an end of the filter element into the melted portion of the end cap. The melted portion, on cooling, solidifies to bond the tubular filter element to the end cap. The end cap can be formed of thermoplastic containing an electrically conductive filler. The end cap can be formed of a thermoplastic having a melting point of at least 180 C. The method may further include, after the embedding step, a step of forcing melted thermoplastic from the melted portion radially against a side wall of the tubular filter element.
Claims15
A method of producing a filter unit, the method comprising:
- providing a tubular filter element and a thermoplastic end cap, said thermoplastic end cap having inner and outer annular raised side walls and a raised annular portion located between and spaced from the raised side walls;
- melting the raised annular portion of the end cap;
- embedding an end of the tubular filter element into the melted portion of the end cap;
- forcing melted thermoplastic from said melted portion radially against a side wall of the tubular filter element;
- and
- cooling the melted portion so as to solidify to bond the tubular filter element to the end cap.
Dependencies are inferred from the claim text.