| 摘要 |
A vacuum molding process includes selecting a flexible polymer cover for covering a selected cement container and at least partially filling the container with a cement mixture. The polymer cover is removably attached to the partially filled cement container and a vacuum is applied to the cement mixture in the container. The process may also include connecting a vibrator to the container for simultaneously vibrating the container and the placing of a hollow mold core member having a plurality of apertures therein in the middle of the container for the gas bubbles to escape as a result of the vibration of the cement mixture in a vacuum.
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