| 摘要 |
The invention relates to a vacuum-proof frame 14 for laminate presses 6 for producing multilayer printed-circuit boards, having rotating sealing rings 12 on both sides, which consist of a material which is elastic and heat-resistant. In the case of this sealing frame, the incorporation of the sealing rubber or of the sealing lip, which must then be replaced, represents a problem. A further problem is the incorporation of the frame into the individual press levels. For this purpose, the invention provides that the frame 4 be provided on the top and bottom and on the outside with in each case one circumferential groove 9, 10 and on the inside with a reinforcing lip 11. The sealing rings 12 are of tubular construction and located on their outside are two tabs 5, which rotate around and are offset through 90 DEG . A vent valve 8 is provided in the relatively small segment of the sealing rings 12 located between the tabs, and reinforcing ribs 13, which run upwards to form tips, are provided in the relatively large segment located between the tabs. In each case one such sealing ring 12 is arranged above and below the frame, which sealing ring 12 is mounted by means of the tabs 5 in the top and bottom grooves 9 of the sealing frame 14. <IMAGE>
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