Ejection system

The simplest molds consist of two parts one fixed and one moveable. We use such molds to fabricate items, such as disposable stadium cups, compact disks, and coat hangers, which have simple designs with no undercuts. As the complexity of the product increases, so must the complexity of the mold. The molds used to produce large items, such as dishwasher tubs and automobile bumpers, may consist of multiple moveable components and weigh several tons. Even apparently simple items, such as screw tops for bottles, require a complex ejection system that unscrews the product from part of the mold. In order to facilitate cooling, virtually all molds are designed with liquid cooling channels. 

All capsule pipeline systems include a pipe, many capsules, an injection system to inject capsules into the pipe, a pumping system to pump the fluid and capsules through the pipe, an ejection system to eject the capsules from the pipe, an instrumentation system to monitor the flow rate, pressure, temperature, and the passage of capsules at key locations, and an automatic control system that uses programmable logic controllers and an SCADA (Supervisory Control and Data Acquisition). 

The ejection system must be capable of physically removing unwanted product items from the main accept stream. The ejection process typically takes place while the product is in free fall accept particles are allowed to continue along their normal trajectory, and rejects are deflected into a receptacle. Deflection is usually achieved by emitting short bnrsts of compressed air through nozzles aimed directly at the rejects, althongh large or heavy objects (e.g., whole potatoes) may reqnire some sort of piston-operated device to mechanically deflect the rejects. 

The injection mold is a series of steel plates, which when assembled produces the cavity that deflnes the shape of the molded part. Conventional molds consist of the mold frame, components, runners, cooling channels, and ejector system. The mold frame is a collection of steel plates that contain mold components and runners, cooling and ejection systems. Components are parts inserted into either bored holes or cutout pockets in the mold frame. The polymer melt enters into the mold cavity or cavities through the runners, which are passages cut into the mold frame. The hot polymer material in the mold... 

Poor ejection system or bad locations of ejector(s) Insufficient sprae to nozzle contact Sprue to long... 

A top plate B core pin C male half D guide pin E push-back rods (to return ejection system) F guide bush G bottom plate H risers or parallels J ejector pin... 

The micro-droplet piezoelectric ejection system may overcome these obstacles. The device provides collimated flow in a manner similar to ink-jet printers. This facilitates depositing of the drug on the ocular surface and the result differs markedly from eye dropper instillation or spray. 

The delivery is based on the piezoelectric fluid ejection system, which monitors every application of a drug. Using sophisticated technology, the system is able to control the dosing and ejection of micro-droplets to enable direct application on the ocular surface. It can be used across a platform of topical medications. Glaucoma, antibiotic, and mydriatic drops have been successfully sprayed using this delivery system. 

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