| 摘要 |
An extrusion nozzle with a discharge slot has a body with a central tongue separating two passages terminating at that slot, each passage consisting of an inner channel and an adjoining outer channel supplied with synthetic-resin material from respective distributing chambers to form a pair of superposed layers on each side of the tongue. The width of each layer is independently controllable by a pair of resiliently deflectable inner lips, remote from the discharge slot, and a pair of resiliently deflectable outer lips, proximal to that slot, whose distance from the tongue is adjustable by respective screws.
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