Ink composition, printer, and method for ejecting the ink composition
A composition, technology of a printer, applied in the direction of ink, printing, household utensils, etc., capable of solving problems such as ineffective nozzles, poor start of fluid jetting, bad fluid jetting, etc.
Pending Publication Date: 2018-02-16
PROCTER & GAMBLE CO
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Problems solved by technology
[0003] As a result, such fluids will typically fail to eject from the head when it fires the nozzles or when the head is idle for a period of time, thus resulting in poor initiation of fluid ejection, poor fluid ejection, and in the case of colorants and / or pigments, poor color consistency
Although agitation or agitation of the bulk fluid can be used to increase the dispersion of particles in the fluid, such agitation or agitation has no effect on flow feature areas and nozzles in jet heads
Therefore, initial injection of fluids with high solids content from the injection head is a challenge
Method used
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[0035] figure 1 A schematic plan view illustrating a portion of the thermal fluid ejection head 10 is shown. The thermal fluid ejection head 10 includes a substrate 12 (eg, the material of the substrate 12 may be “silicon”), and a nozzle plate 14 attached to the substrate 12 . Base 12 may include a single fluid feed slot or multiple fluid feed slots 16 and 18 . A plurality of jetting devices, such as heater resistors 20 , are located adjacent slots 16 and 18 . Upon activation of the spraying device (eg, heater resistor 20 ), fluid is sprayed through nozzles 22 (ie, nozzle holes) in nozzle plate 14 .
[0036] figure 2 A cross-sectional view, not to scale, of a portion of thermal fluid ejection head 10 is illustrated. The substrate 12 includes a plurality of layers 24 on its device side for delimiting the plurality of heater resistors 20 . Nozzle plate 14 includes nozzles 22 (ie, nozzle holes), fluid chambers 28 , and fluid passages 30 , collectively referred to as flow fe...
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Abstract
Provided are an ink composition, a printer, and a method for ejecting an aqueous fluid having a viscosity above about 1 Pa-sec at 25 DEG C from a fluid ejection head. The ink composition, the printerand the method include an aqueous fluid that contains an aqueous carrier component, solid particles ranging from about 8 wt.% to about 25 wt.% based on a total weight of the aqueous fluid, and a rheology modifier. A heater pulse signal applied to ejection heaters on a fluid ejection head for a period of time is sufficient to sputter fluid from fluid ejection nozzles associated with the ejection heaters and to shear the fluid thereby reducing the viscosity of the fluid from above about 1 Pa-sec to less than about 0.1 Pa-sec. A firing signal subsequently applied to the ejection heaters on the ejection head provides steady state fluid ejection from the ejection head.
Description
technical field [0001] The present invention relates to methods of reliably jetting a fluid onto a substrate, into air or a gas, into a liquid, or onto a solid material, and in particular, the invention relates to ink compositions, A printer, and method for increasing the reliability of a fluid volume ejected using a fluid thermal ejection head. Background technique [0002] Inkjet technology using aqueous inks is very well understood when ejecting fluids that exhibit Newtonian fluiddynamic behavior. However, fluid formulations containing high solids levels are particularly troublesome during the initial fluid injection initiation step following a period of no fluid injection. For example, inkjet inks may contain a high density of particles, such as colorants and / or pigments, that may settle rapidly from the bulk fluid into the fluid ejection head. Settling of such dense particles creates a concentration gradient that significantly increases fluid density and viscosity in ...
Claims
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IPC IPC(8): C09D11/03C09D11/037B41J2/01B41J2/14B41J2/17
CPCB41J2/01B41J2/14B41J2/17C09D11/03C09D11/037C09D11/00C09D11/30C09D11/107C09D11/322
Inventor 安杰·K·苏塔尔山姆·诺拉萨科
Owner PROCTER & GAMBLE CO