| 摘要 |
A dispensing system for settable liquids, such as urethane foams and coatings, catalyzed polyesters and epoxies, and other liquid compositions that cure or react and thicken or solidify, applies a flow of compressed air to purge the settable liquids from a mixing and dispensing apparatus, and a purge air control delays the application of compressed purge air to the dispenser for settable liquids to avoid disturbance of the dispensed settable liquid.
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