DYNAMIC MODELING OF THE FLOW RATE IN TIME-PRESSURE FLUID DISPENSING PROCESSES

摘要

Time-pressure fluid dispensing has been widely employed in electronics packaging manufacturing, where the fluid (such as encapsulant, adhesive, etc.) in a pre-filled syringe is driven by pressurized air and delivered to boards or substrates. In such a process, the flow rate dynamics is critical in controlling the amount of the fluid dispensed, yet extremely difficult to represent due to its complex behavior. This paper presents the development of a dynamic model for representing the flow rate in time-pressure fluid dispensing, taking into account the compressibility of the air in the transmission line and syringe, as well as the inertia of the fluid in the syringe. Experiments have been performed to validate this model.