67 results about "Drop volume" patented technology

A method, system and apparatus for forming a three-dimensional object on a layer-by-layer basis involves forming a portion of the three-dimensional object using selective deposition modeling (SDM). SDM involves using at least one orifice, such as a jet, which dispenses a droplet of a flowable material that solidifies upon being dispensed. A drop volume capability of each orifice is adjusted until substantially all orifices have a uniform drop volume capability and all dispensed droplets of the flowable material have a uniform volume.

A segmented heater resistor is provided for producing a variable ink drop volume in an inkjet drop generator. The segmented heater resistor includes multiple heater resistor segments to which a voltage may be selectively applied, resulting in a variable amount of energy dissipated by the segmented heater resistor, a variable amount of heat transferred to ink in the ink drop generator, and a variable ink drop volume expelled by the inkjet drop generator.

A method an apparatus for maintaining a predetermined ejected ink drop volume in a continuous inkjet printer is provided. An ink parameter, for example, temperature, velocity, flow rate, viscosity, is monitored. A time period between activation control signals provided to an ink drop forming mechanism is varied in response to a change in the ink parameter. The apparatus includes an ink parameter monitoring device which provides an input signal to a controller. The controller varies the time period between activation control signals provided to the ink drop forming mechanism.

A printer uses closed loop control to keep material drops ejected by a printhead within a predetermined range. The printer forms at least two objects on a support member and then operates a specular sensor array to obtain image data of the two objects on the support member. The two objects have different predetermined heights to enable a controller in the printer to identify the mass or volume of the material drops forming the objects to adjust operational parameters of the printer to maintain the mass or volume of the material drops in the predetermined range.

The invention discloses an ink jet printing spray head, an ink jet amount measuring system and method and an ink jet amount control method. The ink jet printing spray head comprises a cavity used forcontaining ink, and multiple nozzles communicating with the cavity and used for conducting ink jet printing. The printing spray head further comprises an electricity applying device used for applyingelectric charges to ink drops passing through the nozzles, ink jet signals corresponding to the preset ink drop amount are applied to the nozzles. The charged ink drops pass through a magnetic field so that the dropping track of the ink drops can be deflected, the ink drop amount is calculated according to the ink drop dropping point positions, ink jet signals are adjusted after the ink jet amountis compared with the preset amount, and therefore the ink drops can have the preset amount. By means of the ink jet printing spray head, the ink jet amount measuring system and method and the ink jetamount control method, the deflection principle of charged particles in the magnetic field is used, the ink jet signals are changed, and the ink drop dropping positions are calculated and adjusted, so that the ink drop volume is determined, uniformity of the volume is ensured, and the ink jet printing precision of the equipment is improved.

In one embodiment, an integrated circuit (IC) fabrication material is dispensed from a print head by dividing its nozzles into several groups, and sequentially allowing each group to fire. The nozzles may be grouped based on the amounts of material they dispense. For example, the nozzles may be grouped by drop volume or drop mass. In one embodiment, an IC fabrication material is dispensed on a substrate by controlling a firing sequence of a nozzle to promote merging of material on the substrate. The firing sequence may also be altered to take into account the firing sequence of adjacent nozzles.

A method and apparatus for masking low drop volume print defects in inkjet printers. In one exemplary embodiment, the invention obtains a print mask, determines a likelihood that an individual ink ejection nozzle will produce a low drop volume, determining a correction factor, and compensates for the low drop volume. The low drop volume may be compensated by increasing the drop intensity, modifying the print mask, or combinations of both.

A liquid jet includes a fundamental period of jet break off. A print period is defined as N times the fundamental period of jet break off where N is an integer greater than 1. Input image data is provided having M levels per input image pixel including a non-print level where M is an integer and 2<M≦N+1. A charging device waveform, independent of the input image data, repeats during print periods and includes print and non-print drop voltage states. A drop formation device waveform, having a period equal to the print period, is selected in response to the input image data to form from the jet print drops having a volume corresponding to an input image pixel level. The devices are synchronized to produce a print drop charge to mass ratio and a non-print drop charge to mass ratio on drops breaking off from the jet.

A drop deposition apparatus for laying down a patterned liquid layer on a receiver substrate, for example, a continuous ink jet printer, is disclosed. The liquid deposition apparatus comprises a drop emitter containing a positively pressurized liquid in flow communication with a linear array of nozzles for emitting a plurality of continuous streams of liquid having nominal stream velocity v_j0, wherein the plurality of nozzles have effective nozzle diameters D₀ and extend in an array direction with an effective nozzle spacing L_y. Resistive heater apparatus is adapted to transfer thermal energy pulses of period τ₀ to the liquid in flow communication with the plurality of nozzles sufficient to cause the break-off of the plurality of continuous streams of liquid into a plurality of streams of drops of predetermined nominal drop volume V₀. Relative motion apparatus is adapted to move the drop emitter and receiver substrate relative to each other in a process direction at a process velocity S so that individual drops are addressable to the receiver substrate with a process direction addressability, A_p=τ₀S. The effective nozzle spacing is less than 85 microns, the process speed S is at least 1 meter/sec and the addressability, A_p, of individual drops at the receiver substrate in the process direction is less than 6 microns. Drop deposition apparatus is disclosed wherein the predetermined volumes of drops include drops of a unit volume, V₀, and drops having volumes that are integer multiples of the unit volume, mV₀. Further apparatus is adapted to inductively charge at least one drop and to cause electric field deflection of charged drops.

A printhead and a method of ejecting liquid droplets are provided. The method includes providing a printhead operable to eject liquid drops having a plurality of drop volumes V_i, for i equal to 1 through n, where n≧2, with V_j>V_i when j>i. One of the plurality of drop volumes is a minimum drop volume V_min, and a difference in drop volumes between successively larger drops equals (V_k+1−V_k) which is less than V_min, for k equal to 1 through n-1. The method also includes ejecting liquid drops through the printhead.

The present invention relates to a method that enables image quality of a printed image to be maintained by reducing unintended variations in drop volume, through the adjustment of ink drop ejecting conditions depending on the amount of ink remaining in an ink tank chamber or reservoir, and/or the ink demand for printing an image. The method of printing of the present invention comprises: providing a printhead in fluid communication with an ink chamber or reservoir; detecting at least one parameter related to an amount of negative pressure provided to the printhead; and adjusting an ink drop ejecting condition of the printhead as a function of the parameter so that an amount of variation in size of ejected ink drop is reduced.

The invention discloses a single drop electrostatic spraying system stable work regulation method and belongs to the technical field of electrostatic drop generation. A single drop electrostatic spraying system can monitor a moment t and a single drop volume V when a drop enters a laser beam irradiation range in real time and estimates a drop jetting average flow rate which is shown in the following description as a set reference value of an actual liquid supply flow rate Qs. By adopting the method, a photomultiplier is used as a starting circuit of a regulation and control device, when dripping drops enter the laser beam irradiation range, the light scattering phenomenon occurs, the photomultiplier converts a collected optical pulse signal to an electric pulse signal as a starting signalof a system; and through a photoelectric technology, the volume and the drop production time interval of the jet single drop are detected, and the drop jetting average flow rate, which is described inthe following description, is estimated as the set reference value of the actual liquid supply flow rate Qs, so that relative stability of the liquid volume at a nozzle can be realized, and thus thestability of the drop production time interval and the single drop volume is ensured.

A continuous ink jet printing system capable of printing at multiple predetermined print resolutions. The system comprises a drop generator having an array of nozzles for emitting a plurality of continuous streams of liquid for applying ink to media driven in a media advance direction having a source for pressurized liquid for supplying pressurized liquid to the plurality of nozzles. The plurality of nozzles have effective nozzle diameters D₀ and a stimulation device associated with each nozzle of the plurality of nozzles for forming ink drops having predetermined drop volumes from the continuous streams of liquid. The predetermined drop volumes include non-print drops of a unit volume V₀, and print drops having volumes that are integer multiples of the unit volume, mV₀, wherein m is an integer greater than 1. A catcher collects the non-print drops and a selector selects a predetermined print resolution. Each predetermined print resolution has a corresponding print drop volume mV₀.

The invention relates to a marking device for an automatic cloth inspecting machine, comprising a defect marking device and a code marking device, wherein the defect marking device is composed of marker extruders which are arranged at intervals along the horizontal direction, the code marking device is arranged at one end of the defect marking device, the code marking device is composed of more than three marker extruders which are distributed in an array shape, the marker extruder comprises a marker storage tank and an extruding mechanism, the extruding mechanism is connected with the markerstorage tank, and an extruding hole is arranged at the lower end of the marker storage tank. The marking device in the structure can not be contacted with a cloth, and the cloth can not be damaged during relative motion. The marking device provided by the invention is used for dropping volume of the marker, and the dropping speed is fast, a produced mark is a point, the position of a defect can be clearly and accurately marked, and the working efficiency of a subsequent working procedure is effectively improved.

A gasoline sulfur-decreasing composite, its production and use are disclosed. The composite consists of copper with copper oxide 1-50 wt%, and spinelle composite 50-99 wt% with alkaline earth 20-70 wt% and aluminum 30-80 wt%. The average grain diameter of copper oxide is not greater than 30 nm. The usage level of copper-contained solution is 1.5-100 times of spinelle composite drop volume. It hasbetter desulfurizing activity and can be used as adsorbent and cracking accessories.

The invention discloses a drop volume measuring device, particularly to a drop measuring device for automatically measuring liquid volume in petrochemical industry. A drop volume detecting device is mounted at a to-be-detected liquid outlet and includes a funnel, a funnel cover, a photoelectric sensor, a level bubble, a mirror and magnetic steel. The to-be-detected liquid outlet is inserted into the eccentric liquid intake opening of the funnel cover and contacted with the liquid collecting wall of the funnel so as to be fixed. The drop drips out of a dripping outlet and falls for a distance, and then the double-peak pulse width produced by drop is measured by the photoelectric sensor, as a result, the liquid volume is measured according to a certain proportional relation.

A method for printing on an inkjet printing machine including color space transformation between target and process color spaces using a computer, includes calibrating the machine by printing and colorimetrically measuring a process color space test chart for printing in the target color space including printing-operation-related limitations in the applied ink amount. The generated measured valuescorrespond to sampling points in the measured target color space. The sampling points are interpolated to define further sampling points. The color space transformation uses sampling points in the target color space and input values from the chart in the process color space corresponding to sampling points in the target color space. The physical variable of ink drop volume is directly used for ink application limitations and input values in the process color space. The calibration of the machine is adapted and the printing operation is carried out.