31 results about "Cascade impactor" patented technology

Methods and apparatus for the deposition of a source material (10) are disclosed. An atomizer (12) renders a supply of source material (10) into many discrete particles. A force applicator (14) propels the particles in continuous, parallel streams of discrete particles. A collimator (16) controls the direction of flight of the particles in the stream prior to their deposition on a substrate (18). In an alternative embodiment of the invention, the viscosity of the particles may be controlled to enable complex depositions of non-conformal or three-dimensional surfaces. The invention also includes a wide variety of substrate treatments which may occur before, during or after deposition. In yet another embodiment of the invention, a virtual or cascade impactor may be employed to remove selected particles from the deposition stream. Also a method and apparatus for maskless deposition of copper lines on a target, specifically relating to localized solution-based deposition of copper using an annular aerosol jet and subsequent material processing using conventional thermal techniques or laser processing.

Methods and apparatus for the deposition of a source material (10) are disclosed. An atomizer (12) renders a supply of source material (10) into many discrete particles. A force applicator (14) propels the particles in continuous, parallel streams of discrete particles. A collimator (16) controls the direction of flight of the particles in the stream prior to their deposition on a substrate (18). In an alternative embodiment of the invention, the viscosity of the particles may be controlled to enable complex depositions of non-conformal or three-dimensional surfaces. The invention also includes a wide variety of substrate treatments which may occur before, during or after deposition. In yet another embodiment of the invention, a virtual or cascade impactor may be employed to remove selected particles from the deposition stream.

The invention relates to low flow rate cascade impactors for sampling aerosols, notably but not limited to pharmaceutical aerosols. The impactor stages serve as both orifice plate and collecting cup, simplifying collection and analysis. The impactor is designed to operate at flow rates approximating the inspiratory flow rates of young children and infants. Also presented is a method of and apparatus for applying a coating material to the collection surface of the stages after an impactor is assembled for use. The method entails generation of a polydisperse aerosol and sampling into the impactor. The coating substance improves the trapping of particles on the stages. The apparatus and method of application limit the amount of coating material applied and confines it to the regions of particle impact opposite the stage orifices.

A pre-separator for separating out large particles from a fluid flow has a housing forming an interior chamber with an inlet and an outlet, and a separator plate in the chamber between the inlet and outlet. The separator plate has a surface facing the inlet that is provided with a liquid carrying tank into which the flow is directed when it enters the interior chamber through the inlet. The separator plate has a series of nozzle openings therethrough adjacent its periphery to the outside of the tank. The nozzle openings adjacent the periphery of the separator plate overlie a surface of the housing adjacent the outlet. The pre-separator thus has two impaction stages that permit use across a wide range of flows. The separator plate and the housing have surfaces which are tapered so that liquid in the housing can be drained out when the housing is inverted.

The application describes an automated system for carrying out tests using a cascade impactor 10 of the type having multiple impactor stages each comprising a respective stage body 30, the stage bodies being shaped to enable them to be assembled in a stack in which they locate one upon another. The system includes an expander device 90 having respective arms for supporting each of the stage bodies, and a mechanism for separating the arms along the axial direction to disassemble the impactor 10.

An automated cascade impactor is disclosed and comprises a vertical array of a plurality of impactor stages, and a vertical array of isolation stages, wherein the vertical array of the isolation stages comprises pairs of isolation stages between which impactor plates, removed from respective ones of the impactor stages are effectively sandwiched between each pair of isolation stages. Still further, each compactor stage is likewise sandwiched between and upper and a lower pair of the isolation stages.

A porous metal denuder has a cascade impactor to collect aerosol particles of different diameters, two porous metal discs downstream to collect basic and acidic gases, respectively, and a final filter to collect particles smaller than the cut diameter of the last stage of the cascade impactor which will penetrate the two porous metal discs.

In order to solve a plurality of defects of the aerodynamic characteristic determination of the micro-particles of the preparation by adopting a cascade impactor, the invention provides a test devicefor improving the in-vivo and in-vitro correlation of an inhaled preparation. The device comprises a drug delivery device 1, a human respiratory tract model 2 and a breathing simulator 3, wherein thehuman respiratory tract model 2 comprises an adapter 21 and a real human respiratory tract 3D solid model 22, the breathing simulator 3 comprises a connection control assembly 31, a piston type movement device 32, a control system 33 and a breathing data acquisition device 34, and the device is characterized in that the real human respiratory tract 3D solid model 22 is provided with a plurality offirst quick-connection interfaces 221, the plurality of first quick-connection interfaces 221 are finally converged into a total air path through a plurality of air paths and then connected to the inlet end of the connection control assembly 31, the outlet end of the connection control assembly 32 is connected to the piston type movement device 32; and the connection control assembly 31 comprisesa first solenoid valve 311, a second solenoid valve 312, a third solenoid valve 313, an electronic flow meter 315, and a main body air path.

The present invention relates to a cascade impactor for measuring particle size distribution of an aerosol comprising nicotine, the cascade impactor comprising: an induction port for receiving an inhaler; and at least one sample collection stage comprising a nozzle assembly and a collection means; wherein the collection means of at least one sample collection stage is coated with isopropyl alcohol.

The present invention relates to method of testing the bacterial filtering efficiency of a fabric, the method including the steps of preparing a solution including bacteria, peptone water and NaCl, feeding said solution including bacteria to a nebulizer, generating an aerosol of said bacterial solution and flowing said solution through a cascade impactor to provide a plurality of bacteria colonies in a plurality of plates present in a plurality of stages of said cascade impactor, characterized in that the concentration of NaCl in the peptone water used to prepare said bacterial solution is in the range of 30 g/L to 150 g/L and in that the temperature of said cascade impactor is in the range of −15° C. to 15° C.

The invention belongs to the field of epidemic prevention mask production, and particularly relates to a filterability detection process for epidemic prevention mask production based on melt-blown cloth, which comprises the following steps: S1, material selection and installation: a worker places selected materials needing to be detected on each test base one by one; S2, clamping and limiting: stable clamping and limiting are performed on the selected materials placed on each test base in the step S1, small hydraulic cylinders are controlled to be started, at the moment, under the working action of the small hydraulic cylinders on the two sides, a mounting plate can be pushed to stably move downwards on a cascade impactor in combination with corresponding hydraulic rods, the small hydraulic cylinder and the hydraulic rods can drive all fixing barrels at the bottom of a mounting plate to move downwards at the same time, stable cooperation work can be conducted with corresponding test bases. Convenient and stable comparison detection work is conducted on multiple selected materials at the same time, deviation of the detection result of the selected materials can be effectively prevented, andthe use stability and accuracy of the device are improved.

A collection plate for a cascade impactor is provided that includes: a container; an absorbent layer including a bottom surface and a top surface, the absorbent layer residing within the container, the absorbent layer further including a liquid medium within the absorbent layer; and an impaction membrane placed on the top surface of the absorbent layer, such that the impaction membrane is in fluidic communication with the absorbent layer. The absorbent layer is configured to hydrate the impaction membrane for at least four hours in a temperature of about 78° F. at 37% RH. The collection plate may be utilized as a component in a cascade impactor and/or in a method of collecting a biological sample with a cascade impactor.

Provided is a continuous isokinetic sampling device of a stack gas having a suction nozzle to which a cross-sectional area control device is attached, and a continuous automatic measurement system of fine dusts in the stack gas combined with the same, the device and system being configured to continuously separate and automatically measure the suspended particles into PM10 (Particulate Matter Less than 10 μm) and PM2.5 (Particulate Matter Less than 2.5 μm) by introducing a suction gas into a particle size separation device (cascade Impactor) at a constant flow rate of 16.67 l/min, simultaneously with removing an measurement error caused due to inertia force of the suspended particles by automatically adjusting the cross-sectional area of the suction nozzle to suck the sample at the same flow rate as that of the stack gas in the stationary source emissions.

The invention relates to apparatuses and methods for applying a coating material to the collection surfaces of the stages after an impactor is assembled for use. The apparatuses and methods comprise generation of a multimodal droplet aerosol of liquid coating material and delivering it into the impactor. The coating substance improves the trapping of particles on the stages. The apparatuses and methods limit the total amount of coating material applied and confine it to the regions of particle impact opposite the stage orifices, thereby reducing the possibility of chemical interference when analyzing a test aerosol.

The invention relates to a cascade impactor having a first stage comprising a plate (2) with fixed bores as gas inlet and at least a first impact wall (4) with a variable distance from the plate (2) as well as at least a second stage having a fixed second impact wall (5), which is arranged in the flow direction downstream of the first impact wall (4).