An inkjet print head including a plurality of single jet elements. Each of the single jet elements includes an aperture configured to eject ink during a jetting event, and a channel for receiving ink, the channeling including a recirculation portion configured to receive ink during a non-jetting event. The print head also includes a first manifold structured to supply ink to the channel, and a second manifold structured to receive ink from the recirculation portion of the channel. The ink flows from the inlet portion to the second outlet portion during non-jetting through the second outlet portion.

Examples of a print particle transfer device are described herein. Some examples of the print particle transfer device include a print particle vessel to contain print particles. In some examples, the print particle transfer device also includes a plunger with a fibrous seal element to engage an inside surface of the print particle vessel. The fibrous seal element seals an interface between the plunger and the inside surface of the print particle vessel to prevent escape of the print particles at the interface during movement of the plunger within the print particle vessel.

An ink jet recording device includes the following. A conveyor conveys a recording medium. A recording operator ejects an ink to cause the ink to land on the recording medium in a middle of a conveyance path of the recording medium conveyed by the conveyor. A reverser returns the recording medium from a first position downstream of a landing position of the ink, which is ejected from the recording operator, to a second position upstream of the landing position along the conveyance path. A first temperature regulator that regulates a temperature of the recording medium in at least a part of a region from the second position to the landing position on the conveyance path. A hardware processor causes the recording operator not to eject the ink while the recording medium initially passes through the landing position.

An ink jet recording device includes the following. A conveyor conveys a recording medium. A recording operator ejects an ink to cause the ink to land on the recording medium in a middle of a conveyance path of the recording medium conveyed by the conveyor. A reverser returns the recording medium from a first position downstream of a landing position of the ink, which is ejected from the recording operator, to a second position upstream of the landing position along the conveyance path. A first temperature regulator that regulates a temperature of the recording medium in at least a part of a region from the second position to the landing position on the conveyance path. A hardware processor causes the recording operator not to eject the ink while the recording medium initially passes through the landing position.

Industrial printing systems, including systems and techniques relating to drop-on-demand (DOD) inkjet printing systems include an apparatus including: a receptacle defining a hold chamber to receive ink, the receptacle including a first portion configured to hold a first quantity of ink, and a second portion that is smaller than the first portion and configured to hold a second quantity of ink, the second portion including a first heat conducting surface, and a second heat conducting surface offset from the first heat conducting surface by a distance determined in accordance with a melting point of the ink, the second heat conducting surface defining a barrier between the first portion and the second portion and including at least one opening configured to allow flow of the ink from the first portion to the second portion; and at least one heating element configured to heat the receptacle.

Systems and methods for industrial printing, e.g., using drop-on-demand (DOD) inkjet print heads, include, in at least one aspect, a printing device including: a print head including a print engine, including multiple nozzles, and circuitry to selectively eject ink through the multiple nozzles to form an image on a moving substrate, and to purge the ink through the multiple nozzles; and a printhead enclosure having an opening in front of the multiple nozzles to allow the selectively ejected ink to pass through the opening when the selectively ejected ink is ejected toward the moving substrate; wherein the printhead enclosure includes a hole placed away from the multiple nozzles; and wherein the printhead enclosure is configured to direct the ink that is purged through the multiple nozzles along an inside surface of the printhead enclosure to the hole through which the ink flows and exits the printhead enclosure.

A circulation device according to an aspect includes a storage unit for storing liquid and a liquid droplet discharge unit for discharging liquid, and controls circulation of liquid flowing through a channel communicating the storage unit and the liquid droplet discharge unit with each other. Such a circulation device includes a robotic portion, a first pressure portion, a second pressure portion, a first valve portion, and a second valve portion. The robotic portion is mounted with the liquid droplet discharge unit. The first pressure portion feeds the liquid stored in the storage unit to the liquid droplet discharge unit through a first channel communicating the storage unit and the liquid droplet discharge unit with each other. The second pressure portion feeds the liquid recovered in the liquid droplet discharge unit to the storage unit through a second channel communicating the storage unit and the liquid droplet discharge unit with each other. The first valve portion is interposed between the first pressure portion and the liquid droplet discharge unit. The second valve portion is interposed between the second pressure portion and the liquid droplet discharge unit.

An image processing system and method provide for receiving a digital document page to be printed. The page includes a background region for which no color is specified. A user is presented with an option to select a print medium from a set of print media of different colors and to select an option for a color of the selected print medium be used as a color of a background layer of the digital document page. When the option is selected, a background layer is inserted into the page. A print job incorporating the processed digital document page is output to an associated printer that is configured to convert the color of the background layer to colorant values that use the print media as a colorant for rendering at least a part of the background region.

Industrial printing systems, including systems and techniques relating to drop-on-demand (DOD) inkjet printing systems include an apparatus including: a receptacle defining a hold chamber to receive ink, the receptacle including a first portion configured to hold a first quantity of ink, and a second portion that is smaller than the first portion and configured to hold a second quantity of ink, the second portion including a first heat conducting surface, and a second heat conducting surface offset from the first heat conducting surface by a distance determined in accordance with a melting point of the ink, the second heat conducting surface defining a barrier between the first portion and the second portion and including at least one opening configured to allow flow of the ink from the first portion to the second portion; and at least one heating element configured to heat the receptacle.

In some examples, an apparatus can include a pawl including an anti-rotation surface and a spring, and a valve housing including a wedge, where the spring biases the pawl to a first position in response to the valve housing being at a closed position such that the wedge of the valve housing contacts the anti-rotation surface of the pawl to prevent rotation of the valve housing at the first position of the pawl.