| 摘要 |
<p>The present invention provides a flexible packaging web
(a) comprising a non-oriented sealant film (10) characterized by a secant modulus of less than 120,000 psi and an elongation at break of greater than 150%, wherein the non-oriented sealant film (10) comprises a thermoplastic base layer (11) of ethylene/vinyl alcohol copolymer, ethylene/norbornene copolymer, polyamide or blends thereof and a heat sealing layer (13), and wherein the base layer (11) of the non-oriented sealant film (10) has a metal coating (12) deposited thereon having a thickness of between 1.0 to 100 nanometers; and
(b) wherein the packaging web has an oxygen gas transmission rate of between 0 to 10.0 cm 3 /100 in 2 /24 hours (0 to 155 cm 3 /m 2 /24 hours) at 73° F (23° C) and 0% relative humidity and a water vapor transmission rate of between 0 to 0.1 g/100 in 2 /24 hours (0 to 1.55 g/m 2 /24 hours) at 100° F (38° C) and 90% relative humidity. The sealant films (10) are formed by a blown coextrusion method.</p> |
