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Drop-on-demand printing head and drop-on-demand printing method

A printing method and printing head technology, applied in the direction of printing, etc., can solve problems such as clogging of nozzles, accumulation, contact, etc.

Active Publication Date: 2019-12-13
彼得约伊特
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that the mixed ink comes into contact with the nozzle
This may be when the physicochemical parameters of the mixed ink do not allow the mixed ink to be ejected, or when the mixed ink is chemically unstable and a reaction occurring within the mixed ink results in a change in the Causes problems when mixed inks solidify
In cases where a chemical reaction is initiated while mixing the ink components, any residue of the mixed ink that comes into contact with the nozzle may cause residue build-up, leading to clogging of the nozzle during printing

Method used

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Examples

Experimental program
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Effect test

no. 1 approach

[0142] A first embodiment of an inkjet print head 100 according to the present invention is in figure 1 shown in the overview and in the Figure 2A-2E Shown above are detailed cross-sectional views in various variations. Figure 2A and Figure 2B The same cross-sectional view is shown, but different elements have been labeled in different figures for the sake of clarity of the drawing.

[0143] Inkjet printhead 100 may include one or more nozzle assemblies 110 each configured to generate combined droplets 122 ejected from a pair of nozzles 111A, 111B separated by divider 131. Two initial droplets 121A, 121B are formed. This embodiment can be enhanced by using more than two nozzles. figure 1 A head with 8 nozzle assemblies 110 arranged in parallel to print a row 191 of 8 dots on a substrate 190 is shown. It is worth noting that the printhead in alternative embodiments may include only a single nozzle assembly 110 or more or less than 8 nozzle assemblies, and may even inclu...

no. 2 approach

[0167] A first variant of the second embodiment of the inkjet print head 200 according to the invention is in image 3 is shown in an overview. Figure 4A and 4B The same longitudinal section is shown, but different elements have been labeled in different figures for the sake of clarity of the figures. Figure 5 shows parallel to the Figure 4A and Figure 4B Partially cut longitudinal sectional view in . Figure 6 Various transverse cross-sectional views are shown.

[0168] Inkjet printhead 200 may include one or more nozzle assemblies 210, each nozzle assembly 210 configured to produce a combined droplet 222 consisting of two primary droplets ejected from a pair of nozzles 211A, 211B. 221A, 221B are formed. image 3 A head is shown having multiple nozzle assemblies 210 arranged in parallel to print a multi-dot row 291 on a substrate 290 . Notably, a printhead may include only a single nozzle assembly 210, or even as many as 256 nozzle assemblies or more.

[0169] Eac...

no. 3 approach

[0195] A third embodiment of the head 300 is in Figure 7 It is schematically shown in longitudinal section. Most of its features are the same as those of the second embodiment, with the following differences.

[0196] At the first section 343 of the main housing 341 and at the first section 352 of the secondary housing 351 there are charging electrodes 362 , 363 which apply an electrostatic charge to the bound droplet 322 .

[0197] Furthermore, downstream, behind the first outlet section 352 of the secondary housing 351 , there are deflection electrodes 364A, 364B which deflect the flow direction of the charged droplets 322 in a controllable direction. Thus, the placement of droplets 322 can be effectively controlled. In order to allow changing the exit path of the droplet 322 from inside the head 300 , the outlet opening 3810 of the cover 381 has a suitable width so that the deflected droplet 322 does not come into contact with the cover 381 .

[0198] The charge electro...

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PUM

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Abstract

A method of drop-on-demand printing comprising the steps of: expelling a first initial droplet of a first liquid to move along a first path; expelling a second initial droplet of a second liquid, in a printhead, so that it moves along the second path; controlling the flight of the first initial droplet and the second initial droplet so that the first initial droplet and the second initial droplet combine at a connection point within a reaction chamber in the printhead to form combining droplets to induce a chemical reaction between the first liquid of the first initial droplet and the second liquid of the second initial droplet within the controlled environment of the reaction chamber; and controlling the bound droplet along the path of the bound droplet The flight through the reaction chamber is such that the bound drop moves away from the elements of the printhead during its motion along the bound drop path from the connection point.

Description

technical field [0001] The present invention relates to a drop-on-demand printing head and a drop-on-demand printing method. Background technique [0002] Inkjet printing is a printing method that reproduces digital images by firing ink droplets onto paper, plastic or other substrates. There are two main technologies in use: continuous (CIJ) and drop-on-demand (DOD) inkjet. [0003] In continuous inkjet technology, a high-pressure pump directs a liquid solution of ink and fast-drying solvent from a reservoir through a gun body and tiny nozzles to create continuous ink droplets via Plateau-Rayleigh instability flow. Piezoelectric crystals generate sound waves as they vibrate within the gun body and cause the stream to break up into droplets at regular intervals. Ink droplets are subjected to an electrostatic electric field generated by charged electrodes as they form; this electric field varies according to the degree of drop deflection desired. This creates a controlled,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/21
CPCB41J2/211B41J2/0458B41J2/04581B41J2/04595
Inventor 彼得·约伊特
Owner 彼得约伊特