Fluidtight zip fastener

Abstract

The fluidtight zip fastener comprises a pair of fluidtight zip fastener carrying tapes carrying the zip fastener coupling member rows and which are in each case formed by a base tape with a soft, synthetic rubber or similar covering layer. They engage on one another by their edge portions. The pair of continuous coupling member rows is sewn to the zip fastener carrying tapes in a spaced offset position transversely to the longitudinal edges of said carrying tapes in such a way that the press-contact edge portions of the soft covering layers are in contact with one another along a longitudinal plane, which intersects the zip fastener at a central axis thereof and runs at right angles to the zip fastener principal plane. The press-contact edge portions project over said longitudinal plane, when the coupling member rows are disengaged. The edge portions, when the coupling member rows are engaged, are bent away from the side carrying the coupling member rows so as to extend roughly at right angles to the zip fastener principal plane. The soft covering layers of the press-contact edge portions engage on one another under pressure action when the zip fastener is closed and thus ensure the fluidtightness condition.

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