| 摘要 |
This invention relates to a method and apparatus for manufacturing a multi-layer flattened cylindrical film of thermoplastic resin stretched its layers crosswise, the outer one being stretched lengthwise, the inner one transversely, more particularly, relates to a method and apparatus for manufacturing a multi-layered cylindrical film of thermoplastic resin stretched its layers crosswise, the outer one being stretched lengthwise having a larger diameter than the inner one which is stretched transversely being expanded by means of an intermediate mandrel so as to be stuck to the outer layer through an inner layer having a low melting point. |
