| 摘要 |
<p>An apparatus for molding tubular members of fiberous cement, comprises a two part mold including a foraminous casing and an expansible core structure; means rotatably supporting at least one of said mold parts, and means for expanding and contracting said core to compress and express moisture from the cement and then release the compressed cement, said core structure including a flexible sleeve surrounding a foraminous core having longitudinal external ribs.</p> |
