| 摘要 |
<p>A vacuum valve 28 is disclosed for use with a segmental blow mold in an I.S. machine. When the blow mold closes around a prison, vacuum is applied to the inner wall of the blow mold via the vacuum valve 28. The valve 28 includes a vacuum-on/off valve 44 and a normally open vacuum-throttling valve 50 connected in series in the vacuum line between a vacuum source and the blow mold. At some time following the application of the vacuum, final blow will occur blowing the prison into a bottle. This vacuum will be applied until the parison has been blown into a bottle. During the initial period during which vacuum is applied but final blow has not started, the vacuum is reduced by partially closing the throttling valve 50.</p> |
