Abstract: A printing apparatus includes: an ink discharge head discharging UV ink; a sub-tank storing the UV ink; a supply pump sending the UV ink to the sub-tank from an ink cartridge; an ink circulation path having a forward circulation path through which the UV ink supplied to the ink discharge head from the sub-tank flows, and a backward circulation path through which the UV ink returning to the sub-tank from the ink discharge head flows; and a receptacle that has an opening opened upward and is provided inside the sub-tank. Here, a backward-path downstream-side end which is an end portion of the backward circulation path on the sub-tank side is positioned below the opening inside the receptacle and a forward-path upstream-side end which is an end portion of the forward circulation path on the sub-tank side is positioned below the receptacle inside the sub-tank.

Abstract: A printing apparatus includes a first circulation flow path which includes an outgoing path and a return path, a heating section which heats the ink, a branching section which branches the outgoing path, a branch path in which the ink flows to the ink reservoir section from the branching section, and a control section capable of switching between a first state in which the ink which is heated by the heating section is returned to the ink reservoir section through the first circulation flow path and a second state in which the ink is returned to the ink reservoir section through the branch path, in which in at least a portion of a period from a start-up of the printing apparatus until image formation is carried out, a mode is set to the second state and during the image formation, the mode is set to the first state.

Abstract: A printing apparatus includes an ink ejecting head which ejects an ultraviolet curing ink, a supply flow path and a circulation outgoing path in which the ultraviolet curing ink which is supplied from an ink cartridge which stores the ultraviolet curing ink to the ink ejecting head flows, a circulation pump which is provided in the circulation outgoing path and emits heat, and a gas supplying module which is provided closer to an upstream side than the circulation pump in the supply flow path and the circulation outgoing path and supplies air to the ultraviolet curing ink which flows in the supply flow path.

Abstract: An ink jet method includes supplying a radiation curable composition to a discharging head via a composition flow channel; and discharging the radiation curable composition from the discharging head, in which the composition flow channel includes a gear pump that causes the radiation-curable composition to flow in the composition flow channel, and an air supply mechanism that supplies air to the radiation curable composition further to the upstream side in the flow direction than the gear pump.

Abstract: A printing apparatus includes an ink ejecting head which ejects a UV ink, a sub-tank which reserves the UV ink, an ink circulation flow path which includes a circulation outgoing path in which the UV ink which is supplied to the ink ejecting head from the sub-tank flows and a circulation return path in which the UV ink which returns to sub-tank from the ink ejecting head flows, and a check valve which is provided in the circulation return path and is capable of opening and closing the circulation return path, in which the circulation return path is opened by the check valve when the UV ink flows in the circulation return path in a forward direction, and the circulation return path is closed by the check valve when the UV ink flows in the circulation return path in a reverse direction.

Abstract: A recording apparatus includes a discharge head which discharges a radiation curable ink to a recording medium, an ink container which stores the radiation curable ink to be supplied to the discharge head, an ink circulation flow path which is formed so that the radiation curable ink supplied from the ink container returns back to the ink container, and is connected to the discharge head, a degassing module which is provided in the middle of the ink circulation flow path, and a vacuum controller which controls the degree of vacuum of the degassing module, and the vacuum controller controls the degree of vacuum so that the degree of vacuum is ?60 kPa to ?20 kPa.

Abstract: A liquid circulation device includes a supply unit that forms a flow path supplying a liquid from a reservoir unit; a collection unit that forms a flow path collecting the liquid to the reservoir unit; and N number of the connection units provided respectively corresponding to N number of ejection units ejecting the liquid forming a flow path connecting the supply unit and the collection unit via the ejection units, wherein with regard to each of N number of the connection units, a connection order of the connection units with respect to the supply unit, which is counted from upstream in a flow direction of the liquid in the supply unit coincides with a connection order of the connection units with respect to the collection unit, which is counted from upstream in the flow direction of the liquid in the collection unit.

Abstract: There are provided a head ejecting a liquid, a retaining section retaining the liquid, a degassing section with a degassing unit, a first supply flow path flowing the liquid from the retaining section to the degassing section, and a second supply flow path flowing the liquid degassed in the degassing section to the head. The degassing section further includes a degassing flow path having the degassing unit to flow the liquid while reducing pressure, a bypass flow path flowing the liquid without reducing the pressure, a branching section dividing the liquid flowing in the first supply flow path into the degassing flow path and the bypass flow path, and a joining section joining the liquid flowing in the degassing flow path and the liquid flowing in the bypass flow path to flow in the second supply flow path.

Abstract: A degassing process where gas is removed by depressurizing a liquid to be less than atmospheric pressure and a pressurizing process where the liquid is pressurized to be more than the atmospheric pressure are executed at a low cost and taking up less space. There is provided a head configured to eject a liquid from a nozzle, a supply section configured to supply the liquid to the head and including a degassing section in which the liquid supplied to the head is depressurized to be less than atmospheric pressure, and a pressurizing section in which the liquid is pressurized to be more than the atmospheric pressure, and a single pump having an action of depressurizing the degassing section and an action of pressurizing the pressurizing section.

Abstract: An ink jet recording method includes ejecting an ultraviolet-ray curable ink of which a viscosity at 28° C. is 8 mPa·s or more from a head to a recording medium, and curing the ultraviolet-ray curable ink attached to the recording medium, wherein, in the ejecting of the ultraviolet-ray curable ink, the ultraviolet-ray curable ink is heated such that a temperature of the ejected ultraviolet-ray curable ink becomes 28° C. to 40° C., and a viscosity of the ultraviolet-ray curable ink at the temperature is 15 mPa·s or less.

Abstract: A liquid circulation device includes a supply unit that forms a flow path supplying a liquid from a reservoir unit; a collection unit that forms a flow path collecting the liquid to the reservoir unit; and N number of the connection units provided respectively corresponding to N number of ejection units ejecting the liquid forming a flow path connecting the supply unit and the collection unit via the ejection units, wherein with regard to each of N number of the connection units, a connection order of the connection units with respect to the supply unit, which is counted from upstream in a flow direction of the liquid in the supply unit coincides with a connection order of the connection units with respect to the collection unit, which is counted from upstream in the flow direction of the liquid in the collection unit.

Abstract: A liquid circulation part has a recovery path where a liquid flows into a retaining part from a first head and a second head. The recovery path has a first merging point where the liquid flowing from the first head and the liquid flowing from the second head are merged, a first recovery path part where the liquid flowing from the first head flows into the first merging point, and a second recovery path part where the liquid flows from the first merging point. The cross-sectional area of the second recovery path part, orthogonal to a direction of flow of the liquid in the second recovery path part, is greater than the cross-sectional area of the first recovery path part, orthogonal to the direction of flow of the liquid in the first recovery path part.

Abstract: A filter unit includes: a space portion, through which a liquid passes, whose outer cross-sectional shape when cut along the direction orthogonal to the axial direction is circular or polygonal; a filter provided at the surface on one end side of the space portion in the axial direction thereof; a protruding member, provided at the surface on the other end side of the space portion in the axial direction thereof, that protrudes toward a center area of the surface on the one end side of the space portion; an inflow channel that allows the liquid to flow into the space portion from a direction tangential to the side circumferential surface of the space portion; and an outflow channel that allows the liquid to pass through the filter and flow out from the space portion.

Abstract: An ultraviolet ray curable ink jet recording apparatus includes a head for discharging an ink composition for an ultraviolet ray curable ink jet recording, an ink flow path supplying the ink composition for the ultraviolet ray curable ink jet recording to the head, and a gear pump for circulating the ink composition for the ultraviolet ray curable ink jet recording to the ink flow path, in which the ink composition for the ultraviolet ray curable ink jet recording contains a hindered amine compound.

Abstract: A liquid ejecting apparatus including: a plurality of pressure chambers communicating with a plurality of nozzles respectively; and a plurality of liquid ejecting heads having a common liquid chamber configured to supply liquid common to the plurality of pressure chambers, wherein each of the liquid ejecting heads includes a liquid supply channel communicating with the common liquid chamber and supplying liquid from the liquid storage tank toward the common liquid chamber by the liquid feeding unit and a liquid discharge channel communicating with the common liquid chamber and discharging the liquid from the communicating chamber toward the liquid storage tank by the liquid feeding unit, and the directions of flows of the liquid in the common liquid chamber flowing from the liquid supply channels through the common liquid chamber toward the liquid discharge channels are opposite from each other between the adjacent liquid ejecting heads.

Abstract: A liquid circulation device includes a supply unit that forms a flow path supplying a liquid from a reservoir unit; a collection unit that forms a flow path collecting the liquid to the reservoir unit; and N number of the connection units provided respectively corresponding to N number of ejection units ejecting the liquid forming a flow path connecting the supply unit and the collection unit via the ejection units, wherein with regard to each of N number of the connection units, a connection order of the connection units with respect to the supply unit, which is counted from upstream in a flow direction of the liquid in the supply unit coincides with a connection order of the connection units with respect to the collection unit, which is counted from upstream in the flow direction of the liquid in the collection unit.

Abstract: A liquid ejecting apparatus including: a plurality of pressure chambers communicating with a plurality of nozzles respectively; and a plurality of liquid ejecting heads having a common liquid chamber configured to supply liquid common to the plurality of pressure chambers, wherein each of the liquid ejecting heads includes a liquid supply channel communicating with the common liquid chamber and supplying liquid from the liquid storage tank toward the common liquid chamber by the liquid feeding unit and a liquid discharge channel communicating with the common liquid chamber and discharging the liquid from the communicating chamber toward the liquid storage tank by the liquid feeding unit, and the directions of flows of the liquid in the common liquid chamber flowing from the liquid supply channels through the common liquid chamber toward the liquid discharge channels are opposite from each other between the adjacent liquid ejecting heads.

Abstract: An optical device may include a flat optical member; a reinforcement member which is bonded to a back side of the optical member and demonstrates stronger rigidity in a center area thereof than two side portions thereof when curved in a thickness direction in a first direction within an in-plane direction; and a driving device which switches a shape of the optical member together with the reinforcement member between a flat state and a curved state in which the optical member is curved in the first direction.

Abstract: A pressurizing/depressurizing method of a liquid ejecting apparatus which includes a print head which ejects liquid, and a supply unit which supplies the liquid to the print head, the method including depressurizing/pressure accumulating in which a depressurization buffer tank is depressurized, and a pressure is accumulated; pressurizing/pressure accumulating in which a pressurization buffer tank is pressurized, and a pressure is accumulated; depressurizing in which the liquid is depressurized so that a pressure is lower than an atmospheric pressure in the supply unit using the depressurization buffer tank; and pressurizing in which the liquid is pressurized so that the pressure is higher than the atmospheric pressure in the supply unit using the pressurization buffer tank.

Abstract: A liquid circulation part has a recovery path where a liquid flows into a retaining part from a first head and a second head. The recovery path has a first merging point where the liquid flowing from the first head and the liquid flowing from the second head are merged, a first recovery path part where the liquid flowing from the first head flows into the first merging point, and a second recovery path part where the liquid flows from the first merging point. The cross-sectional area of the second recovery path part, orthogonal to a direction of flow of the liquid in the second recovery path part, is greater than the cross-sectional area of the first recovery path part, orthogonal to the direction of flow of the liquid in the first recovery path part.