New EVAL? EVOH Resins for Flexible Packaging

摘要

Due to higher productivity, lower cost, and diverse function, coextrusion coating has come to be regardedas an excellent method of manufacturing composite packaging. An important application for EVOH (ethylene vinylalcohol) barrier resin is in coextrusion coating, where EVOH is used in conjunction with paper, foil and otherplastics for flexible and semi-rigid containers. Taking advantage of EVOH’s high speed processability and superiorpinhole resistance, plus flavor, odor and gas barrier properties, EVOH/Paper, EVOH/Polyolefin, andEVOH/Paper/Aluminum containers and flexible have been very successful in the marketplace. This paper is areview of the balance of processability, thermal stability and barrier properties in various EVAL EVOH (ethylenevinyl alcohol) resins typically used in coextrusion coating. This paper will discuss the use of EVOH of varyingmol% ethylene, including new grades of EVOH optimized for high speed coextrusion coating and laminating,including basic properties and processability, gas, flavor and aroma barrier properties, thermal stability, and anoverview of applications and structures.