| 摘要 |
A mold or die having two parts with a cavity and an interface between them and a feed opening in one of the mold parts cooperates with a charge feed for raw changes and any evacuation device providing a low pressure. Alternatingly, the feed and the evacuation is connected to the feed opening, so that upon connection of the evacuation device, a pressure gradient obtains in the feed opening for obtaining an outflow of air from the mold cavity through the feed opening, while on connecting the feed to the feed opening, the pressure gradient in the feed opening is reversed for obtaining a flow of charge material into the mold cavity; a channel in one of the mold parts extends from the interface and peripherally in relation to the cavity, there being a shallow slot connecting the channel to the cavity; a seal circumscribes the channel to seal the cavity and the channel against atmospheric pressure; and a duct in the one mold part having the channel, leads from the channel to the evacuation so that the reversed pressure gradient into the feed opening and out of the cavity continues to discharge gases that develop during filling.
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