Method for manufacturing an air filter
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United States of America Patent
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-
May 3, 1994
Grant Date -
N/A
app pub date -
Nov 20, 1991
filing date -
Nov 20, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for manufacturing an air filter consists of building in two stages around a paper filtering element previously prepared, an edge made of flexible foam, first injecting resin into a separate space from the filtering element, and then letting it expand until it anchors to it. An apparatus to carry out such method consists of a die in which the filtering element is inserted, around which a channel is formed where a mobile frame is sinked, whose shape corresponds to the filtering element one, in such a way as to define an injection recess separated from the filtering element, and an expansion recess adjacent to the filtering element, connected by the mobile frame lift, so that the resin can expand and anchor to the filtering element.
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