Abstract: A resin filler tube includes: a tubular body; a flange having a diameter greater than an outer diameter of the tubular body, a thickness greater than a thickness of the tubular body, and a predetermined width in an axial direction, and having a first axial end face forming a weld surface to be welded to an outer circumferential edge of an opening hole of a fuel tank; and a base-end-side reverse tapered portion which connects between an end of the tubular body on the fuel tank side and an end of an outer circumferential surface of the flange on a side opposite to the fuel tank side, and which is reversely tapered so as to increase a diameter toward the flange. The base-end-side reverse tapered portion has an inner diameter that is not less than an inner diameter of the tubular body over an entire range in the axial direction.

Abstract: An image forming method, includes: applying water-based ink to a first region of an object to be subjected to image forming by an inkjet method; applying a resin powder to a second region of the object, the first region and the second region at least partially overlapping each other; and heating the first region and the second region to thermally fix the water-based ink and the resin powder to the object. The water-based ink includes a pigment and at least one of a water-soluble resin and a resin emulsion.

Abstract: An image forming method includes: applying a resin powder to a first area of an object to be subjected to image forming; applying a water-based ink comprising pigments to a second area of the object by an inkjet method to form an image, the first area and the second area at least partially overlapping each other; and heating the first area and the second area to fix the resin powder and the water-based ink to the object. By contact with the resin powder, the water-based ink either thickens, or causes an aggregation of the pigments.

Abstract: A water-based ink includes a colorant, water, a penetrating agent, and a wetting agent. The penetrating agent includes diethylene glycol monohexyl ether (DEHE). The wetting agent includes a compound having an SP value of 12 to 14. A ratio (A/B) of an amount (A) of the compound having an SP value of 12 to 14 to the amount (B) of DEHE is 2.5 or more. The wetting agent preferably includes at least one of triethylene glycol and tripropylene glycol. The ratio (A/B) of the amount (A) of the compound having an SP value of 12 to 14 to the amount (B) of DEHE is preferably 2.5 or more and less than 10.

Abstract: A water-based ink includes a pigment, water, a penetrating agent, and a binder resin. The penetrating agent includes a compound of formula (1). x is greater than or equal to 6. The binder resin includes a urethane bond. A content of the binder resin in the water-based ink is greater than 1.0 mass %. The compound of formula (1) is preferably diethylene glycol monohexyl ether. The water-based ink preferably further includes an organic solvent having a solubility parameter (SP) value of 12 to 14.

Abstract: A water-based ink includes water, a colorant, and a water-soluble organic solvent. The water-soluble organic solvent includes a penetrating agent and a wetting agent. The penetrating agent includes a compound of formula (1), and the wetting agent comprises a compound of formula (2). In formula (1), x is 4 or more, and y is 2 or more, in formula (2), x is 2 or more. An amount of the compound of formula (1) relative to a total mass of the water-based ink is preferably 0.1 to 2.0 mass %. An amount of the compound of formula (2) relative to a total mass of the water-based ink is preferably 1.0 to 10.0 mass %.