Methods can be used for producing three-dimensional objects by powder bed fusion, using inks containing superparamagnetic particles and solvents. Sintering is performed by a magnetic field having a frequency of 50 kHz to 5 GHz.

The invention relates to an inkless printing method. The invention also relates to an inkless printing device, in particular configured to perform at least a part of the method according to the invention. The invention furthermore relates to a substrate provided with at least one printed marking realised by applying the method according to the invention and/or the device according to the invention.

The invention relates to an inkless printing method. The invention also relates to an inkless printing device, in particular configured to perform at least a part of the method according to the invention. The invention furthermore relates to a substrate provided with at least one printed marking realised by applying the method according to the invention and/or the device according to the invention.

A thermal transfer sheet includes a dye layer disposed on a first surface of a substrate film. The dye layer includes a decolorizable dye. The decolorizable dye has a color difference ΔE*ab between a color A and a color B of 10 or less, where the color A is a color of a transfer-receiving body before the decolorizable dye is transferred to the transfer-receiving body, the color B is a color of a portion of the transfer-receiving body with the decolorizable dye having been transferred thereto, and the color of the portion is a color after the portion is irradiated by a xenon lamp at an irradiation intensity of 1.2 (W/m.sup.2) for 50 hours, the portion having a reflection density of 0.5 or greater before being irradiated by the xenon lamp.

A combination of a thermal transfer sheet and an intermediate transfer medium of the present disclosure is characterized in that the thermal transfer sheet includes a first substrate and a coloring layer, a peel-off layer, and a heat seal layer disposed on the first substrate; the intermediate transfer medium includes a second substrate and a transfer layer; the peel-off layer is a layer for removing a portion of the transfer layer from the intermediate transfer medium; and an absolute value of a difference in 45-degree specular gloss between the heat seal layer and the transfer layer is 20% or more.

A combination of a thermal transfer sheet and an intermediate transfer medium of the present disclosure is characterized in that the thermal transfer sheet includes a first substrate and a coloring layer, a peel-off layer, and a heat seal layer disposed on the first substrate; the intermediate transfer medium includes a second substrate and a transfer layer; the peel-off layer is a layer for removing a portion of the transfer layer from the intermediate transfer medium; and an absolute value of a difference in 45-degree specular gloss between the heat seal layer and the transfer layer is 20% or more.

A release member-integrated image forming sheet that can form a high quality image and has good manufacturing suitability, a release member-integrated image sheet, an image sheet, a method for manufacturing an image sheet, a decorative product having a high quality image, and a method for manufacturing a decorative product that can form a high quality image and has good manufacturing suitability. An image forming sheet is integrated with a release member, the image forming sheet can be separated from the release member, the image forming sheet includes an image layer before image formation, a stable peeling force when the image forming sheet is separated from the release member under conditions of a temperature of 25° C. and an angle of 30° is 1,000 mN/cm or less, and the dynamic coefficient of friction between the front and back surfaces of the release member is 0.3 or more and 0.9 or less.

A visual security feature is provided that is disposed on a target. The visual security feature includes two substantially transparent layers. At least one of the two substantially transparent layers is present in an image-wise pattern.

A printing device is configured to print a multi-layer thermal printing medium. The printing device includes a thermal head and a controller. The thermal head has a heat generating elements configured to form images on a heat sensitive multi-layer. The controller is configured to perform detecting whether a viewing direction of the heat sensitive multi-layer is a thickness direction to view from a second surface toward a first surface or a direction opposite the thickness direction to view from the first surface toward the second surface. The controller is configured to further perform creating print data to be applied to each of the heat generating elements. The created print data is such that color development states of a first color and a second color according to the detected viewing direction are differentiated from color development states of the first color and the second color according to an undetected viewing direction.

A printed product including: a yellow image formed on an image receiving sheet including a coloring material receiving layer and a surface protective layer formed on the yellow image, wherein the yellow image and the surface protective layer are formed by sequentially applying heat to a yellow coloring material layer for forming the yellow image and a surface protective layer forming layer for forming a surface protective layer through use of a thermal transfer recording sheet including the yellow coloring material layer and the surface protective layer forming layer field sequentially; the yellow coloring material layer contains a compound having a predetermined structure as a yellow coloring material, and wherein in the printed product having formed thereon the yellow image and the surface protective layer, the compound permeates into the coloring material receiving layer to a depth of 2 μm or more.