Techniques for fabricating an inkjet printhead include providing a printhead substrate (100), fabricating a thinfilm structure (101) on the substrate, forming a break trench (124) in a surface region of the substrate in which a feed slot is to be formed, and subsequently abrasively machining the substrate through the break trench to form the feed slot (126). The break trench can be formed by an etch process, prior to applying a barrier layer (112) to the thinfilm structure in a preferred embodiment.

The present invention is drawn to a print medium and a method of preparing the same. The print medium can include a media substrate, a porous ink-absorbing layer coated on the media substrate, and a porous ink-receiving layer coated on the porous ink-absorbing layer. The porous ink-absorbing layer can include semi-metal oxide or metal oxide particulates and a first binder, and the porous ink-receiving layer can include organosilane-functionalized semi-metal oxide or metal oxide particulates and a second binder.

An ink for ink-jet recording includes: at least one of an azo dye having a specific structure; and at least one of a betaine surfactant and a nonionic surfactant, and an ink set includes the ink, and an ink-jet recording method used the ink.

An ink composition comprising a dispersion medium and a charged particle, wherein the charged particle comprises a colorant, a compound having pKb of 16 or less in water and containing a proton-acceptive neutral functional group, and a charge controlling agent having pKa of 16 or less in water and containing a proton-donative group.

The present invention provides a method for manufacturing an ink jet recording head utilizing ink bubbling by heating of an exothermic resistor to thereby eject ink and a method manufacturing the same, including the steps of: preparing a substrate provided with the exothermic resistor; applying such first resin on the substrate as to provide a first mold shape for forming the nozzle channel and the movable member; forming the first mold shape using the first resin; applying, on the substrate, second resin over the first mold shape for forming the nozzle channel and the movable member; and removing the first mold shape. By this method, the movable member is formed in the nozzle channel between the ink inlet and the exothermic resistor to thereby provide a high-density, high-accuracy ink jet recording head which can improve a frequency response while maintaining proper discharge performance.

The present invention relates to an ink composition and a respective varnish, suitable for use in heatset printing, in particular heatset web offset printing, which is suited to avoid fluting during the printing process. The ink composition comprises at least one solvent having a boiling point of from 200°C to 240°C which is present in an amount suited to allow the ink composition to dry at a printed web temperature of from 40°C to 60°C during the printing process to avoid fluting.

The present invention relates to an ink composition and a respective varnish, suitable for use in heatset printing, in particular heatset web offset printing, which is suited to avoid fluting during the printing process. The ink composition comprises at least one solvent having a boiling point of from 200°C to 240°C which is present in an amount suited to allow the ink composition to dry at a printed web temperature of from 40°C to 60°C during the printing process to avoid fluting.

The invention relates to a process for producing a high-quality ink-jet recorded image. The process comprises the steps of (i) applying a first ink containing at least one colorant to an opaque printing medium by an ink-jet method to form a visible image; and (ii) applying a second ink, which does not change or substantially not change the hue of the printing medium, to a portion of the printing medium that is complementary to the visible image, thereby alleviating a difference in gloss between the visible image and the portion complementary to the visible image.

Disclosed is an ink jet recording ink set having light color inks of a plurality of colors and dark color inks of a plurality of colors. Each of the light color inks has at least a pigment, a solvent and a fine polymer particle and each of the dark color inks having at least a pigment and a solvent. Furthermore, each of the dark color inks either do not contain a fine polymer particle or contain a fine polymer particle in smaller quantity than the light color inks.

An extrusion apparatus having a barrel (3) and a rotatable threaded screw (1) coaxially positioned therein is disclosed. The apparatus includes an upstream inlet section having an opening (13) therein for receiving material to be processed by the apparatus, a compression section (2) downstream of the inlet section, and a mixing or plasticizing section (7/8) downstream of the compression section. The interior surface of the barrel is provided with an undercut (12) therein which intercommunicates the feed opening with the compression section and has a portion thereof which extends downstream in the compression section about the interior surface of the barrel with a continuously decreasing cross-sectional area. The undercut may be formed in a cylindrical insert (9), carried within the barrel and, in an alternate embodiment, a second undercut cylindrical insert positioned about the first insert and rotatable relative thereto may be employed to vary the cross-sectional area of the undercut.