| 摘要 |
<p>CONTAINER MOLDING APPARATUS Mold apparatus for vacuum forming sheet material, especially sheet plastic, including withdrawable projections which project into the mold cavities to form depressions or projections in the resulting molded item and are withdrawable to allow removal of the molded item. Sealing means, such as an "O" ring, on each projection, are included to prevent loss of vacuum through the mold walls around the projections. Counter-rotational camming means are provided for simultaneously projecting or withdrawing a plurality of the said projections either on one mold or on adjacent molds.</p> |
