| 摘要 |
<p>Packaging material with good gas barrier properties comprising a first and a second layer of a fibrous material (2 or 3), e.g. paper or cardboard, and a layer of a water based polymer (4), e.g. polyvinyl alcohol, placed between and in direct contact with the layers of fibrous material and functioning both as a gas barrier and as a binding agent in the packaging material. The packaging material is produced through bringing together and binding together with each other a first and a second strip or sheet of a fibrous material by means of a layer of a water based polymer, e.g polyvinyl alcohol, applied between and in direct contact with the strips or sheets. The surplus water in the thus applied polymer layer is absorbed by the fibrous material in one and/or the other strip or sheet to form the intermediate layer (4) functioning as gas barrier and binding agent. <IMAGE></p> |
