Moisture barrier, filter seal for hopper rail car hatches

Details Moisture barrier, filter seal for hopper rail car hatches Moisture barrier, filter seal for hopper rail car hatches

1995-08-18

1997-05-13

Le, Mark T.

Railway rolling stock

Special car bodies

Freight

22020308, B61D 4900

Patent

active

056282540

ABSTRACT:
A moisture barrier seal for use on a hopper car hatch opening that does not need to be removed before vacuum unloading of the hopper car due to the use of a grained plastic such as vertically drawn or cast polyethylene which will rupture as soon as the seal is subjected to the pressure differential across the seal created by the application of vacuum to the hopper car. The moisture barrier layer when combined with a filter layer forms a combination moisture barrier and filter seal.

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