Abstract: The invention relates to a process for preparing alkali carbonate/bicarbonate salts, comprising continuously feeding aqueous alkali hydroxide solution into a gas-liquid contactor; forcing incoming CO2-containing gas stream through a sparging device submerged in the gas-liquid contactor below the surface level of the aqueous alkali hydroxide solution, to generate bubbles and/or microbubbles; adding hydrogen peroxide in proximity to orifices of the sparging device, from which the bubbles and/or microbubbles evolve, wherein the supply of hydrogen peroxide is adjusted to decrease alkali carbonate formation and increase alkali bicarbonate formation; and continuously discharging an effluent from the gas-liquid contactor and recovering therefrom carbonate and bicarbonate alkali salts predominated by the bicarbonate component. A gas liquid-contactor and an apparatus are also provided by the invention.

Abstract: A system for manufacture of a multi-colored three-dimensional object, comprising at least one tank configured to store a colorless pseudoplastic material at atmospheric pressure, at least one bidirectional pump, an extrusion nozzle having at least one opening and configured to draw thereinto at least a quantity of the color materials and/or colorless pseudoplastic material and extrude in image-wise manner the drawn material and a X-Y-Z movement system configured to move at least the extrusion nozzle in a three coordinate system wherein the extrusion nozzle draws and extrudes the pseudoplastic material through the same opening.

Abstract: Described is a high throughput machine for manufacture of large size 3D objects. The machine uses a combination of a large size main material dispensing head with a satellite lightweight material dispensing head. A motion system could move each material dispensing head along a path identical to the other dispensing head path or move it along a path different from the path of the other material dispensing head. Such complementary movement supports increase in machine throughput.

Abstract: An apparatus for additive manufacturing of large 3D hollow objects with thin walls, includes a 3D hollow object material deposition module configured to deposit a portion of material forming at least a layer of a 3D hollow object wall; a 3D hollow object material solidifying module configured to solidify at least the portion of material forming at least a layer of the 3D hollow object wall; and a support material dispensing module configured to dispense a support material across a cross section of the 3D hollow object wall. The support material is dispensed separately prior to or concurrently with the deposition of the portion of material forming at least a layer of a 3D hollow object wall.

Abstract: The current document discloses an apparatus and method that support manufacture of large 3D hollow objects or shells with thin walls including curved surfaces with high and low curvature change ratio and alleviate or significantly reduce the need for support structures. Further to this, introduction of support structures becomes a function of the curved surface curvature change ratio.

Abstract: The present invention relates to a process for the fabrication of multilayer articles having electrical connections between conductor patterns on at least two layers of the multilayer article.

Abstract: An external drum plotter including a generally cylindrical drum having a longitudinal axis of symmetry and a cylindrical support surface disposed about the longitudinal axis, for supporting thereon in generally cylindrical configuration, recording material to be written upon, apparatus for rotating the drum about the longitudinal axis, longitudinal track apparatus arranged parallel to the longitudinal axis; mounting apparatus arranged for longitudinal riding movement on the track apparatus and parallel to the longitudinal axis and a multiplicity of laser diode writing assemblies mounted on the track apparatus and arranged for writing engagement with the recording material while the recording material rotates and the mounting apparatus moves longitudinally parallel to the longitudinal axis.