| 摘要 |
A stack of membranes and spacers is held between upper and lower plates, the lower plate having hinged thereto, at least two side plates. These may be hinged by being formed integrally so as to be flexible outwardly, or may be hinged by suitable co-operating projections and cut-outs or by more conventional hinge-means. The upper plate is locked by co-operating projections and cut-outs on the upper plate and the top edges of the side plates. Means may be provided to enable the upper plate to be pressed downwardly to different positions to compress the stack to different degrees, these means, for example, including rack shaped surfaces on the projections and/or cut-outs.
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