| 摘要 |
The present invention relates to a ventilating valve for a die or mould intended to be filled with a casting mixture of a polymer material and a ballast material. According to the invention the ventilating valve includes a valve pipe (7) which can be screwed into the die or mould and which has an outlet passage (12) arranged eccentrically in relation to the screwing axis (A-A). One end of the outlet passage communicates with the interior of the die or mould, while the other end of the passage is connected to a net disc having a mesh such as to permit the polymer material present in the casting mixture to pass through the net while preventing the ballast material from leaving the valve pipe. Subsequent to curing of the casting material, the hardened flash or stalk in the valve pipe can be pressed out therefrom, this being facilitated by the fact that the outlet passage (12) diverges in a direction away from the die or mould cavity. |
