A liquid absorber of the present disclosure that absorbs a liquid containing water includes: a first base material; a second base material; and an absorption layer provided between the first base material and the second base material, in which the absorption layer contains a flame-retardant substance, the flame-retardant substance contains a tautomeric compound, and the compound has a tautomer with a hydroxyl group. The flame-retardant substance is preferably melamine cyanurate.

A liquid absorber of the present disclosure that absorbs a liquid containing water includes: a first base material; a second base material; and an absorption layer provided between the first base material and the second base material, in which the absorption layer contains a flame-retardant substance, the flame-retardant substance contains a tautomeric compound, and the compound has a tautomer with a hydroxyl group. The flame-retardant substance is preferably melamine cyanurate.

The invention relates to a pad printing instrument comprising an ink supply system capable of control the temperature, viscosity and colorant concentration of an ink in an ink cup. Such controls are achieved by continuously adding and mixing a cold ink having a composition identical to the ink in the ink cup but having a lower temperature. The continuous addition of a small amount of a cold ink into the ink cup could compensate heat generated by the friction between the ink cup and a cliché and could minimize the evaporation of a diluent in the ink and change in the concentration of colorants in the ink and ink viscosity. The invention also relates to use of a pad printing instrument comprising an ink supply system of the invention for producing colored hydrogel or silicone hydrogel contact lenses.

The invention relates to a pad printing instrument comprising an ink supply system capable of control the temperature, viscosity and colorant concentration of an ink in an ink cup. Such controls are achieved by continuously adding and mixing a cold ink having a composition identical to the ink in the ink cup but having a lower temperature. The continuous addition of a small amount of a cold ink into the ink cup could compensate heat generated by the friction between the ink cup and a cliché and could minimize the evaporation of a diluent in the ink and change in the concentration of colorants in the ink and ink viscosity. The invention also relates to use of a pad printing instrument comprising an ink supply system of the invention for producing colored hydrogel or silicone hydrogel contact lenses.

The invention relates to a pad printing instrument comprising an ink supply system capable of control the temperature, viscosity and colorant concentration of an ink in an ink cup. Such controls are achieved by continuously adding and mixing a cold ink having a composition identical to the ink in the ink cup but having a lower temperature. The continuous addition of a small amount of a cold ink into the ink cup could compensate heat generated by the friction between the ink cup and a clich and could minimize the evaporation of a diluent in the ink and change in the concentration of colorants in the ink and ink viscosity. The invention also relates to use of a pad printing instrument comprising an ink supply system of the invention for producing colored hydrogel or silicone hydrogel contact lenses.

An ink jet recording apparatus includes an image forming unit that forms a first image containing a first liquid and a coloring material on an ink receiving medium; and a liquid absorbing member that includes a porous body which is configured to be brought into contact with the first image so as to absorb at least a portion of the first liquid from the first image, in which the porous body is a porous sheet in which a first layer which is configured to be brought into contact with the first image, a second layer including a second fiber and a third layer including a third fiber are laminated in this order.

An ink jet recording apparatus includes an image forming unit that forms a first image containing a first liquid and a coloring material on an ink receiving medium; and a liquid absorbing member that includes a porous body which is configured to be brought into contact with the first image so as to absorb at least a portion of the first liquid from the first image, in which the porous body is a porous sheet in which a first layer which is configured to be brought into contact with the first image, a second layer including a second fiber and a third layer including a third fiber are laminated in this order.

A printing pad includes a printing surface to be pushed against a printing original plate and a surface to be printed, the printing original plate having ink placed on the printing original plate; an inner layer disposed inside the printing pad; and an outer layer provided in contact with a surface of the inner layer that is closer to where the printing surface is disposed than is an opposite surface of the inner layer. The outer layer has the printing surface on an outside surface of the outer layer, and is formed such that the printing surface is brought into close contact with the surface to be printed to conform to the surface to be printed when the printing surface is pushed against the surface to be printed, and the inner layer has a cavity provided in the inner layer.

A printing pad includes a printing surface to be pushed against a printing original plate and a surface to be printed, the printing original plate having ink placed on the printing original plate; an inner layer disposed inside the printing pad; and an outer layer provided in contact with a surface of the inner layer that is closer to where the printing surface is disposed than is an opposite surface of the inner layer. The outer layer has the printing surface on an outside surface of the outer layer, and is formed such that the printing surface is brought into close contact with the surface to be printed to conform to the surface to be printed when the printing surface is pushed against the surface to be printed, and the inner layer has a cavity provided in the inner layer.

An ink jet recording apparatus includes an image forming unit that forms a first image containing a first liquid and a coloring material on an ink receiving medium; and a liquid absorbing member that includes a porous body which is configured to be brought into contact with the first image so as to absorb at least a portion of the first liquid from the first image, in which the porous body is a porous sheet in which a first layer which is configured to be brought into contact with the first image, a second layer including a second fiber and a third layer including a third fiber are laminated in this order.