| 摘要 |
This invention relates to an improved injector/valve combination which permits nearly immediate response time to an actuator signal. Such a combination is particularly suited for injecting colorants into polyurethane slabstock foam and permits a substantial reduction in foam waste due to low colorations during an on/off cycle. Specifically, this invention combination comprises a novel ball valve (43) which allows for instantaneous shut-off and -on without appreciable leakage or pressure drop and without the need to utilize a high throughput flow rate. Such a ball valve (43) is used in combination with an injector (66) which is actually attached to the valve, the configuration which permits continuous use and instantaneous on/off without a deleterious pressure drop and minimizes the possibility of turbulence as the liquid polymeric colorant flows through the injector. The ball valve (43), the attached injector (66) configuration, the coloring apparatus comprising the inventive ball valve and/or the attached injector configuration, and the slabstock foam colored through the utilization of such an apparatus are also contemplated within this invention. <IMAGE> |
