| 摘要 |
The pressure swirl atomizing nozzle for spraying a curable composition co mprises an orifice piece (16), which defines a funnel-shaped cavity and an e xit orifice (17), and an injector piece (18) which closing off the funnel- s haped cavity so that the funnel-shaped cavity forms a swirl chamber (19) bet ween a front side of the injector piece (18) and the exit orifice (17). The injector piece (18) comprises at least two swirl ports (20) which end in the swirl chamber (19) for injecting the curable composition therein and for th ereby imparting swirl to the curable composition. Compared to the sum of the smallest cross-sectional areas of the swirl ports (20), the side wall (24) of the swirl chamber (19) has a relatively small surface area which is howev er still large enough to distribute the curable composition so as to achieve a uniform spray pattern. By the reduced size of the swirl chamber (19), the curable composition can be atomized more efficiently. In this way, changes of the relatively low flow rate of the curable composition through the nozzl e have less effect on the droplet size and on the stability of the spray pat tern.
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