Abstract: Provided is a photocurable ink jet recording ink composition having a low viscosity and excellent curing property and photopolymerization initiator solubility. The photocurable ink jet recording ink composition includes a polymerizable compound and a photopolymerization initiator. The polymerizable compound includes vinyl ether group-containing (meth)acrylic esters represented by Formula (I) in an amount of 20% by mass or more based on the total mass of the ink composition. The photopolymerization initiator includes a bisacylphosphine oxide photopolymerization initiator in an amount of 5% by mass or more based on the total mass of the ink composition and a thioxanthone photopolymerization initiator. The content ratio of the bisacylphosphine oxide photopolymerization initiator to the thioxanthone photopolymerization initiator is from 3:1 to 5:4.

Abstract: There is provided an ultraviolet-curable ink jet composition, which is stored in an storage body, including a pigment; a pigment dispersant; a polymerizable compound; and a photopolymerization initiator, in which water content is 0.05 mass % to 1.0 mass % based on the total amount of the ultraviolet-curable ink jet composition, and in which both the acid value and the amine value of the pigment dispersant are 50 mgKOH/g or less, and at least one of the acid value and the amine value thereof is 10 mgKOH/g or more.

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: There is provided an ultraviolet-curable ink jet composition, which is stored in an storage body, including a pigment; a pigment dispersant; a polymerizable compound; and a photopolymerization initiator, in which water content is 0.05 mass % to 1.0 mass % based on the total amount of the ultraviolet-curable ink jet composition, and in which both the acid value and the amine value of the pigment dispersant are 50 mgKOH/g or less, and at least one of the acid value and the amine value thereof is 10 mgKOH/g or more.

Abstract: An ink jet method includes feeding an ultraviolet curing type ink jet composition from a composition storing body which stores an ultraviolet curing type ink jet composition, which contains a polymerizable compound and a hindered amine compound as a polymerization inhibitor, with a storing volume of the composition of 2.5 L to 20 L to an ink jet head through a channel, deaerating the ultraviolet curing type ink jet composition in the channel, and discharging the ultraviolet curing type ink jet composition from the ink jet head, in which an amount of a dissolved gas of the ultraviolet curing type ink jet composition after the deaeration is 30 ppm or less and an amount of a dissolved gas of the ultraviolet curing type ink jet composition stored in the composition storing body is 10 ppm or more.

Abstract: There is provided an ultraviolet-curable ink jet composition, which is stored in an storage body, including a pigment; a pigment dispersant; a polymerizable compound; and a photopolymerization initiator, in which water content is 0.05 mass % to 1.0 mass % based on the total amount of the ultraviolet-curable ink jet composition, and in which both the acid value and the amine value of the pigment dispersant are 50 mgKOH/g or less, and at least one of the acid value and the amine value thereof is 10 mgKOH/g or more.

Abstract: There is provided an ultraviolet-curable ink jet composition, which is stored in an storage body, including a pigment; a pigment dispersant; a polymerizable compound; and a photopolymerization initiator, in which water content is 0.05 mass % to 1.0 mass % based on the total amount of the ultraviolet-curable ink jet composition, and in which both the acid value and the amine value of the pigment dispersant are 50 mgKOH/g or less, and at least one of the acid value and the amine value thereof is 10 mgKOH/g or more.

Abstract: Provided is a photocurable ink jet recording ink composition having a low viscosity and excellent curing property and photopolymerization initiator solubility. The photocurable ink jet recording ink composition includes a polymerizable compound and a photopolymerization initiator. The polymerizable compound includes vinyl ether group-containing (meth)acrylic esters represented by Formula (I) in an amount of 20% by mass or more based on the total mass of the ink composition. The photopolymerization initiator includes a bisacylphosphine oxide photopolymerization initiator in an amount of 5% by mass or more based on the total mass of the ink composition and a thioxanthone photopolymerization initiator. The content ratio of the bisacylphosphine oxide photopolymerization initiator to the thioxanthone photopolymerization initiator is from 3:1 to 5:4.

Abstract: An ink jet method includes feeding an ultraviolet curing type ink jet composition from a composition storing body which stores an ultraviolet curing type ink jet composition, which contains a polymerizable compound and a hindered amine compound as a polymerization inhibitor, with a storing volume of the composition of 2 L or more to an ink jet head through a channel, deaerating the ultraviolet curing type ink jet composition in the channel, and discharging the ultraviolet curing type ink jet composition from the ink jet head, in which an amount of a dissolved gas of the ultraviolet curing type ink jet composition after the deaeration is 30 ppm or less and an amount of a dissolved gas of the ultraviolet curing type ink jet composition stored in the composition storing body is 10 ppm or more.

Abstract: An ultraviolet curable composition includes a polymerizable compound and is stored in a storage body, in which an amount of water is greater than or equal to 0.05 mass % and less than or equal to 1.0 mass % with respect to a total amount of the ultraviolet curable composition, a content of at least one metal element selected from a group consisting of Li, Na, K, Ag, Mg, Ca, Ba, Zn, Fe, Sn, Al, and Zr is greater than or equal to 10 ppm by mass, and a content of each metal element included in the group is less than or equal to 250 ppm by mass.

Abstract: Provided is a photocurable ink jet recording ink composition having a low viscosity and excellent curing property and photopolymerization initiator solubility. The photocurable ink jet recording ink composition includes a polymerizable compound and a photopolymerization initiator. The polymerizable compound includes vinyl ether group-containing (meth)acrylic esters represented by Formula (I) in an amount of 20% by mass or more based on the total mass of the ink composition. The photopolymerization initiator includes a bisacylphosphine oxide photopolymerization initiator in an amount of 5% by mass or more based on the total mass of the ink composition and a thioxanthone photopolymerization initiator. The content ratio of the bisacylphosphine oxide photopolymerization initiator to the thioxanthone photopolymerization initiator is from 3:1 to 5:4.

Abstract: Provided is a photocurable ink jet recording ink composition having a low viscosity and excellent curing property and photopolymerization initiator solubility. The photocurable ink jet recording ink composition includes a polymerizable compound and a photopolymerization initiator. The polymerizable compound includes vinyl ether group-containing (meth)acrylic esters represented by Formula (I) in an amount of 20% by mass or more based on the total mass of the ink composition. The photopolymerization initiator includes a bisacylphosphine oxide photopolymerization initiator in an amount of 5% by mass or more based on the total mass of the ink composition and a thioxanthone photopolymerization initiator. The content ratio of the bisacylphosphine oxide photopolymerization initiator to the thioxanthone photopolymerization initiator is from 3:1 to 5:4.

Abstract: A constituent parts assembling method for an actuating apparatus includes a step of assigning ID classification to each of constituent parts with reference to characteristics difference of respective parts when these constituent parts give influence to output characteristics of an injector. In the processes of assembling these constituent parts, when a selected constituent part has a certain ID classification being assigned beforehand, this assembling method includes a step of executing constituent part selection in accordance with an instruction of constituent part designating means which designates other constituent part having an ID classification corresponding to the ID classification assigned to the selected constituent part, and also includes a step of assembling the selected constituent parts into the injector.

Abstract: A drive apparatus supplies electric power to a solenoid of an inductive load from a battery and a capacitor to improve response of the load. The drive apparatus comprises switches for switching between a first state where a negative side of the battery is connected to a positive side of the battery, and a second state where the negative side of the capacitor is connected to the negative side of the battery. When the load is in operation, the voltage applied to the solenoid is raised by the voltage of the battery as the first state, so that the current flowing into the solenoid rises sharply to improve response of the load. When the operation of the load is to be stopped, the electric power to the solenoid is interrupted, and the energy accumulated in the solenoid is recovered by the capacitor as the second state.

Abstract: A drive apparatus supplies electric power to a solenoid of an inductive load from a battery and a capacitor to improve response of the load. The drive apparatus comprises switches for switching between a first state where a negative side of the battery is connected to a positive side of the battery, and a second state where the negative side of the capacitor is connected to the negative side of the battery. When the load is in operation, the voltage applied to the solenoid is raised by the voltage of the battery as the first state, so that the current flowing into the solenoid rises sharply to improve response of the load. When the operation of the load is to be stopped, the electric power to the solenoid is interrupted, and the energy accumulated in the solenoid is recovered by the capacitor as the second state.

Abstract: A constituent parts assembling method for an actuating apparatus includes a step of assigning ID classification to each of constituent parts with reference to characteristics difference of respective parts when these constituent parts give influence to output characteristics of an injector. In the processes of assembling these constituent parts, when a selected constituent part has a certain ID classification being assigned beforehand, this assembling method includes a step of executing constituent part selection in accordance with an instruction of constituent part designating means which designates other constituent part having an ID classification corresponding to the ID classification assigned to the selected constituent part, and also includes a step of assembling the selected constituent parts into the injector.

Abstract: A filter is press-inserted into a mounting bore of an injector. The filter has an inlet section at an opening-end fuel inlet side and a filter section which has a number of holes. The bottom of the filter section is hemispherically-shaped so that a flow area formed between the outer surface of the hemispherical bottom portion and the inner round surface of the mounting inlet bore widens gradually to reduce pressure loss effectively.

Abstract: In a fuel injection valve having a pressure control chamber, a nozzle, and an electromagnetic valve, a fuel flow-in passage, a fuel flow-out passage and at least a part of the pressure control chamber are formed in a single piece of a plate in such a manner that the part of the pressure control chamber is opened to an axial end surface of the plate and the fuel flow-out passage extends so as to penetrate the plate axially from an inner wall of the part of the pressure control chamber to another axial end surface of the plate and the fuel flow-in passage comprises a first passage extending from the axial end surface of the plate and a second passage extending from the inner wall of the part of the pressure control chamber, which intersect with each other within the plate, wherein an entrance orifice is formed in first passage.

Abstract: The angle of fuel spray at the time of pre-injection is set to a wider angle of spray and the angle of fuel spray at the time of main injection is set to a narrower angle of spray. The pre-injection timing is set so that when fuel spray after the pre-injection is diffused in a cylinder and stratified, the stratified fuel spray is ignited by a rise in the pressure in the cylinder in association with movement of a piston from the bottom dead center to the top dead center. The main injection timing is set so that when the spray stratified by the pre-injection is burned, the fuel spray injected by the main injection passes through the combustion zone while being ignited in the combustion zone, reaches a combustion chamber of the piston, and is burned in the combustion chamber.

Abstract: In a fuel injection valve having a pressure control chamber, a nozzle, and an electromagnetic valve, a fuel flow-in passage, a fuel flow-out passage and at least a part of the pressure control chamber are formed in a single piece of a plate in such a manner that the part of the pressure control chamber is opened to an axial end surface of the plate and the fuel flow-out passage extends so as to penetrate the plate axially from an inner wall of the part of the pressure control chamber to another axial end surface of the plate and the fuel flow-in passage comprises a first passage extending from the axial end surface of the plate and a second passage extending from the inner wall of the part of the pressure control chamber, which intersect with each other within the plate, wherein an entrance orifice is formed in first passage.