MULTILAYER LINER FOR A HIGH-PRESSURE GAS CYLINDER
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United States of America Patent
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Issued Date -
Jan 9, 2014
app pub date -
Mar 29, 2012
filing date -
Apr 1, 2011
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Abandoned
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Abstract
A multilayer liner for a high-pressure gas cylinder is provided. The liner has an impact-modified polyamide (PA) layer in contact with the high-pressure gas. The impact-modified PA layer reduces travel of the high-pressure gas from the inside of the liner to the outside of the liner. Use of a gas barrier layer such as an EVOH layer in combination with the impact-modified PA layer results in improved permeation resistance not heretofore demonstrated in a Type 4 cylinder. Combination of the EVOH layer and the impact-modified PA layer results in an interior surface which is compatible with gas environment in the cylinder, ductility at high pressures, a range of temperatures, and can survive cryogenic conditions.
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