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US 4,545,833 AGranted
Method of making a filter bag assembly
OwnerPeter T. Tafarainventor
Life of this patent
Estimating the term…
Abstract
A filter bag assembly includes a filter media fabricated from synthetic materials, has a heat sealed edge forming a cylinder, with one end of the cylinder being heat sealed (welded) to form a closed container. The other cylinder end is folded over a relatively rigid ring member and is sewn (stitched) in a manner to affix the ring member to the filter media thereby maintaining the integrity of the media's micron rating.
Claims10
A method for fabricating a filter bag comprising the steps of:
- (a) preparing filter media in an elongated, generally rectangular configuration;
- (b) folding said media in half along its longitudinal axis;
- (c) placing the juxtaposed edges of said media over a resistance wire disposed in a heater bar;
- (d) closing said pressure bar upon said heater bar with said media disposed therebetween with a prescribed amount of pressure;
- (e) applying electrical current to said resistance wire for a prescribed period of time;
- (f) opening said pressure bar after termination of said electrical current and a prescribed low temperature limit is reached;
- (g) removing said media from said heater bar;
- (h) inserting one distal end of said media between said pressure bar and said heater bar with a prescribed amount of pressure;
- (i) applying electrical current to said resistance wire for a prescribed period of time;
- (j) opening said pressure bar after termination of said electrical current and said prescribed low temperature limit is reached;
- (k) placing the open distal end of said media over a relatively rigid ring means;
- and
- (l) sewing said media so as to capture said ring means thereto forming a container.
10 more elements
Dependencies are inferred from the claim text.