Abstract: A cationic latex fixative for ink applications is provided. The cationic latex fixative derived from a combination of a cationic monomer, a nonionic monomer that provides softness to the latex, and a nonionic monomer that provide stiffness to the latex. A method of manufacturing the fixative and a method of printing the fixative are also provided.

Abstract: A three-dimensional object may be generated. Energy may be applied to a layer of build material to cause a first portion of the layer to coalesce and solidify in a first pattern. A cooling agent may be selectively delivered on a second portion of the layer of the build material to reduce a temperature of the second portion in a second pattern, the first and second patterns being independent of each other.

Abstract: A digital-printing substrate and method of improving adhesion of a substrate to an liquid electrophotographic (LEP) ink in LEP printing both employ a composite coating. The composite coating includes from 4.5% to 9.5% by weight of a mineral pigment and from 0.5% to 2% by weight of an organic binder uniformly dispersed in water. The mineral pigment has a particle size less than 1 micron. The organic binder comprises a hydroxylated polymer having an average molecular weight greater than 50,000. A weight percentage of hydroxyl groups in the hydroxylated polymer is equal to or greater than a weight percentage of acidic groups in an LEP ink. The composite coating enhances adhesion of the LEP ink to the substrate comprising the composite coating dried on a surface of the substrate.

Abstract: An additive manufacturing apparatus includes a platform, a dispenser to deliver a plurality of layers of feed material, one or more light sources configured to emit a first light beam and a second light beam, and a polygon beam scanner including a rotatable mirror having a plurality of reflective facets to redirect the first light beam and the second light beam toward the platform to deliver energy to an uppermost layer of feed material. The mirror is positioned and rotatable such that motion of each facet of the plurality of reflective facets causes the first light beam to sweep along a first path on the uppermost layer and causes the second light beam to sweep along the first path following the first light beam.

Abstract: An additive manufacturing apparatus includes a platform, a dispenser to dispense a plurality of layers of feed material on a top surface of the platform, and an energy delivery system. The energy delivery system has one or more light sources configured to emit a first light beam and a second light beam, and one or more reflective members each having reflective facets to redirect the first light beam or the second light beam toward an uppermost layer of feed material to deliver energy to the uppermost layer. The one or more reflective members are each rotatable such that motion of each sequential facet of the reflective facets of each of the one or more reflective members sweeps the first light beam along a first path on the uppermost layer or sweeps the second light beam along a second path on the uppermost layer.

Abstract: A composition for three-dimensional printing includes a precursor to a soft polymer block having a glass transition temperature (Tg) less than 50° C. and a precursor to a rigid polymer block having a Tg of at least 50° C. The precursor to the soft polymer block is a curable, cross-linkable monomer having an acrylic group, a vinyl group, or combinations thereof. The precursor to the rigid polymer block is a second curable, cross-linkable monomer selected from the group consisting of an acrylate monomer, a vinyl monomer, an acrylamide monomer, a urethane monomer, and an epoxy monomer.

Abstract: An apparatus for positioning micro-devices on a substrate includes one or more supports to hold a donor substrate and a destination substrate, an adhesive dispenser to deliver adhesive on micro-devices on the donor substrate, a transfer device including a transfer surface to transfer the micro-devices from the donor substrate to the destination substrate, and a controller. The controller is configured to operate the adhesive dispenser to selectively dispense the adhesive onto selected micro-devices on the donor substrate based on a desired spacing of the selected micro-devices on the destination substrate. The controller is configured to operate the transfer device such that the transfer surface engages the adhesive on the donor substrate to cause the selected micro-devices to adhere to the transfer surface and the transfer surface then transfers the selected micro-devices from the donor substrate to the destination substrate.

Abstract: An additive manufacturing apparatus includes a platform, a support, an actuator coupled to at least one of the platform and the support and configured to create relative motion therebetween along a first axis such that the support scans across the platform, one or more printheads supported on the support above the platform and configured to dispense successive layers of feed material to form a polishing pad, a plurality of individually addressable energy sources supported above the platform, and a controller. The energy sources are arranged in an array that extends at least along a second axis perpendicular to the first axis and are configured to emit radiation toward the platform. The controller is configured to cause the actuator to create relative motion between the support and the platform such that the one or more printheads and the energy sources scan across the platform.

Abstract: An additive manufacturing apparatus includes a platform, a first support, a first actuator to create relative motion along a first axis such that the first support scans across the platform, one or more printheads supported on the first support above the platform and configured to dispense successive layers of feed material to form a polishing pad, a second support, a second actuator to create relative motion along a second axis substantially perpendicular to the first axis such that the second support scans across the platform in a direction perpendicular to the first axis, and a plurality of individually addressable energy sources supported on the second support above the platform, and a controller. The energy sources are arranged in an array that extends at least along the first axis and configured to emit radiation toward the platform.

Abstract: An additive manufacturing apparatus includes a platform, a dispenser to dispense a plurality of layers of feed material on a top surface of the platform, and an energy delivery system. The energy deliver system includes a light source to emit a light beam, and a reflective member having a plurality of reflective facets. The reflective member is positioned in a path of the light beam to receive the light beam and redirect the light beam toward the top surface of the platform to deliver energy to an uppermost layer of the layers of feed material to fuse the feed material. The reflective member is rotatable such that sequential facets sweep the light beam sequentially along a path on the uppermost layer.

Abstract: An additive manufacturing apparatus includes a platform, a dispenser to dispense a plurality of layers of feed material on a top surface of the platform, an energy delivery system, and an actuator. The energy delivery system includes a light source to emit a light beam, and a reflective member having a plurality of reflective facets, the reflective member positionable in a path of the light beam to receive the light beam and redirect the light beam toward the top surface of the platform to deliver energy to an uppermost layer of the layers of feed material to fuse the feed material. The reflective member is rotatable such that sequential facets sweep the light beam sequentially along a linear path on the uppermost layer. The actuator is configured to adjust an angle of the linear path relative to the platform.

Abstract: An additive manufacturing apparatus includes a platform, a dispenser to dispense a plurality of layers of feed material on a top surface of the platform, and an energy delivery assembly. The energy delivery assembly includes a light source to emit one or more light beams, a first reflective member having a plurality of reflective facets, and at least one second reflective member. The first reflective member is rotatable such that sequential facets sweep the light beam sequentially along a path on the uppermost layer. The at least one second reflective member is movable such that the at least one second reflective surface is repositionable to receive at least one of the at least one light beam and redirect the at least one of at least one light beam along a two-dimensional path on the uppermost layer.

Abstract: An additive manufacturing system includes a platen, a dispenser configured to deliver a powder in a linear region that extends across less than all of a width of the platen, a drive system configured to move the dispenser along the first axis and a perpendicular second axis, a controller, and an energy source configured to selectively fuse a layer of powder. The controller is configured to cause the drive system to move the dispenser along the second axis a first time such that the linear region makes a first sweep along the second axis to deposit the powder in a first swath over the platen, thereafter along the first axis, and thereafter along the second axis a second time such that the first linear region makes a second sweep along the second axis to deposit the powder in a parallel second swath over the platen.

Abstract: An additive manufacturing system includes a platen to support an object being manufactured, a dispenser to deliver a plurality of successive layers of a powder over the platen, and energy source configured to fuse at least a portion of the powder. The dispenser is configured to deliver the powder in a linear region that extends along a first axis. The dispenser and actuator are supported by a support structure, and the actuator is coupled to the support structure to move the support structure along a second axis perpendicular to the first axis such that the dispenser and energy source move as a single unit with the support structure and the linear region sweeps along the second axis to deposit the powder along a swath over the platen to form a layer of powder.

Abstract: An additive manufacturing system includes a platen, a dispenser apparatus positioned above the platen to dispense a layer of powder over the platen, and an energy source to selectively fuse the layer of powder. The dispenser apparatus includes a support structure, a dispenser secured to the support structure and including a reservoir to hold the powder and one or more openings configured to deliver powder from the reservoir in a linear region that extends along a first axis, a spreader extending along the first axis and secured to the support structure and positioned to spread powder already delivered on the platen by the dispenser, and a drive system to move the support structure along a second axis perpendicular to the first axis such that the dispenser and blade move together to sweep the linear region along the second axis to deposit and level the powder.

Abstract: An additive manufacturing system includes a platen to support an object to be fabricated, a dispenser assembly positioned above the platen, and an energy source configured to selectively fuse a layer of powder. The dispenser assembly includes a first dispenser, a second dispenser, and a drive system. The first dispenser delivers a first powder in a first linear region that extends along a first axis, and the second dispenser delivers a second powder in a second linear region that extends parallel to the first linear region and is offset from the first linear region along a second axis perpendicular to the first axis. The drive system a drive system moves the support with the first dispenser and second dispenser together along the second axis.

Abstract: An additive manufacturing system includes a platen having a top surface, a support structure, a powder dispenser coupled to the support structure and positioned above the platen and configured to deliver a powder in a linear region that extends along a first axis, a gas dispenser coupled to the support structure in a fixed position relative to the powder dispenser and having an outlet to deliver a gas across the outermost layer of feed material, an energy source configured to selectively fused the layer of powder, and an actuator coupled to the support to move the support with the powder dispenser and the gas dispenser together along a second axis perpendicular to the first axis and parallel to the top surface such that the linear region and the outlet sweep along the second axis to deposit the powder in a swath over the platen and deliver the gas.

Abstract: An apparatus for positioning micro-devices on a substrate includes one or more supports to hold a donor substrate and a destination substrate, an adhesive dispenser to deliver adhesive on micro-devices on the donor substrate, a transfer device including a transfer surface to transfer the micro-devices from the donor substrate to the destination substrate, and a controller. The controller is configured to operate the adhesive dispenser to selectively dispense the adhesive onto selected micro-devices on the donor substrate based on a desired spacing of the selected micro-devices on the destination substrate. The controller is configured to operate the transfer device such that the transfer surface engages the adhesive on the donor substrate to cause the selected micro-devices to adhere to the transfer surface and the transfer surface then transfers the selected micro-devices from the donor substrate to the destination substrate.

Abstract: A method for manufacturing low effective density TiO2 includes providing a template having a surface. The template surface is coated with a titanium-containing compound that can be reduced to TiO2 at high temperature. The template is removed, thereby forming porous TiO2 particles. The effective density of the porous TiO2 particles is less than 4.

Abstract: In one implementation, a system comprising a target engine, a thermal engine, and a sacrificial object engine is described. The target engine is to identify a target region of a build bed of a print device where a target object is to be located. The thermal engine is to identify a temperature level of the target region. The sacrificial object engine is to identify an object location to place a sacrificial object in response to a determination that the temperature level of the target region is deficient to achieve a temperature threshold for production.