Double-layered balloon envelope

摘要

A balloon envelope, having a base layer of ethylene vinyl alcohol (EVOH) and a layer of a second material, that is not EVOH, bonded to at least a portion of an outer-facing surface of the EVOH layer, is provided. The second material may be polyethylene, or a biaxially-oriented polyethylene terephthalate, such as Mylar®. The envelope may also be provided with another layer of the second material bonded to at least a portion of an inner-facing surface of the EVOH layer. The combination of the EVOH layer and the layer of the second material may be less gas-permeable than the EVOH layer alone and the layer of the second material alone.

主权项

1. A balloon envelope, comprising:
a plurality of gores, wherein adjacent gores of the plurality are connected along respective edges, and wherein at least some of the plurality of gores comprise:
a layer of ethylene vinyl alcohol (EVOH); anda layer of an outer material directly bonded to and in direct contact with at least a portion of an outer-facing surface of the EVOH layer, wherein the outer material is not EVOH, and wherein the outer material has a greater tensile strength than EVOH.