| 摘要 |
PROBLEM TO BE SOLVED: To improve dispensing performance of an applicator for dispensing liquid material onto a substrate.SOLUTION: An applicator for dispensing liquid material onto a substrate includes a body, a valve module having a valve stem, and a backpressure control device provided in the body and having a device passage. The body includes an inlet passage, a dispensing outlet passage, and a recirculation outlet passage. The valve module has a dispensing mode and a recirculation mode, and is configured to direct the liquid material through the dispensing outlet passage in the dispensing mode and to direct the liquid material through the recirculation outlet passage in the recirculation mode. The valve stem is movable between an open position in the dispensing mode and a closed position in the recirculation mode. The backpressure control device directs the liquid material through the device passage in the recirculation mode so that a backpressure of the liquid material in the recirculation mode is substantially equal to a backpressure of the liquid material in the dispensing mode.SELECTED DRAWING: Figure 1C |
