| 摘要 |
The present invention relates to a composite material used in beverage packaging bag easily penetrated by a straw. The composite material is made of more than two layers. A hole used for a straw is pre-punctured at least in one layer of the composite material. And at least one layer is not punctured so as to act as sealing layer. The present invention provides a composite material that is easy to be penetrated by a straw and has a reliable sealability. Moreover this kind of composite material is effective in cost and sanitary. |
