Abstract: The present invention is a granular material that can be well recoated regardless of the type of the granular material, and enables a refractory aggregate in an unprinted portion to be used without any regeneration process, in the manufacture of a three-dimensional laminated and shaped mold. This granular material is a granular material for use in three-dimensional laminated mold shaping, and obtained by adding a material that causes a hydration reaction having a moisture absorbing function and generates a catalytic effect to a coating material mixed with or coated with an acid as a catalyst which activates and hardens an organic binder for binding the granular material.

Abstract: An inspection device includes an illumination unit for illuminating a subject having a bright part and a dark part darker than the bright part, a light path dividing unit for dividing object light from the subject illuminated by the illumination unit into first light and second light that pass through different light paths, a filter for reducing the amount of the first light having passed through the light path dividing unit, a first imaging unit in which the first light having passed through the filter forms an image, a second imaging unit in which the second light having passed through the light path dividing unit forms an image, and an inspection unit for inspecting whether a defect is present in the subject based on information of the bright part taken by the first imaging unit and information of the dark part taken by the second imaging unit.

Abstract: In order to well perform recoating regardless of the type of granular material and reuse a refractory aggregate in an unprinted portion without any regeneration process in the manufacture of a three-dimensional lamination-shaped mold, this invention provides a granular material for use in shaping a three-dimensional laminated mold, which is coated with an acid as a catalyst which activates and cures an organic binder for binding the granular material. The acid contains at least one of sulfuric acid, phosphoric acid, a sulfonic acid and a carboxylic acid, and is one of a mixture of sulfuric acid and another acid, phosphoric acid only, a mixture of phosphoric acid and another acid, sulfonic acid only, a mixture of sulfonic acid and another acid and a mixture of a carboxylic acid and another acid.

Abstract: The present invention is a granular material that can be well recoated regardless of the type of the granular material, and enables a refractory aggregate in an unprinted portion to be used without any regeneration process, in the manufacture of a three-dimensional laminated and shaped mold. This granular material is a granular material for use in three-dimensional laminated mold shaping, and obtained by adding a material that causes a hydration reaction having a moisture absorbing function and generates a catalytic effect to a coating material mixed with or coated with an acid as a catalyst which activates and hardens an organic binder for binding the granular material.

Abstract: An inspection device includes an illumination unit for illuminating a subject having a bright part and a dark part darker than the bright part, a light path dividing unit for dividing object light from the subject illuminated by the illumination unit into first light and second light that pass through different light paths, a filter for reducing the amount of the first light having passed through the light path dividing unit, a first imaging unit in which the first light having passed through the filter forms an image, a second imaging unit in which the second light having passed through the light path dividing unit forms an image, and an inspection unit for inspecting whether a defect is present in the subject based on information of the bright part taken by the first imaging unit and information of the dark part taken by the second imaging unit.