The present invention is related to a deinking primer composition for deinking of a substrate, wherein said deinking primer composition comprises a binder component that has a polymeric backbone with pendent hydroxy or carboxy groups that have been esterified or acetalised or ketalised to such an extent that the binder component has an acid value of 0-50 mg KOH/g or a hydroxyl value of 0-600 mg KOH/g, preferably 0-400 mg KOH/g, so that a primer layer prepared from said deinking primer composition is dissolvable in an alkaline aqueous medium.

An ink composition includes a fluid and a plurality of microcapsules suspended in the fluid. The fluid includes a first chemical compound that exhibits a first color characteristic in a first pH range and exhibits a second color characteristic in a second pH range, where the first color characteristic is visually distinct from the second color characteristic. A second chemical compound is contained within the microcapsules, such that rupturing at least a subset of the plurality of microcapsules releases the second chemical compound. Releasing the second chemical compound shifts a pH of the fluid from a first pH in the first pH range to a second pH in the second pH range.

A marking system comprises a substrate having a surface coated with a color-triggering developer and a deactivating ink composition; and a marking composition comprising at least one color precursor. At least one “non-color developing portion” of the surface is coated with both the color-triggering developer and the deactivating ink composition, and at least one “color-developing portion” of the surface is coated with the color-triggering developer and is not coated with the deactivating ink composition. Color development occurs at the color-developing portion(s) and does not occur at the non-color developing portion(s) upon application of the marking composition to the surface of the substrate.

A method of manufacturing an embossing element for decorative surfaces includes the steps of: a) UV curable inkjet printing a decorative pattern on a metallic surface; and b) forming a relief by etching metal from the metallic surface.

An alkali release solution contains a basic compound, a polyoxyalkylene alkyl derivative, and water, for releasing a printed layer formed on a base material and constituted by a gravure printing ink composition for label surface printing that satisfies a or b below: a) containing no vinyl chloride resin, wherein the composition contains a pigment, a binder resin containing cellulose resin and urethane resin, and an organic solvent, wherein the ratio by mass of the solids content of polyurethane resin and cellulose resin is 5/95 to 95/5; or b) containing a vinyl chloride resin, the composition contains a pigment, a vinyl chloride resin, and a polyurethane resin, wherein the content of the vinyl chloride resin, based on the ratio by mass of the solids content of vinyl chloride resin and urethane resin, is 1.73 parts by mass or lower relative to the urethane resin representing 1.00 part by mass.

Provided are a sheet processing device and a sheet manufacturing apparatus capable of removing color material from printed parts without excess or deficiency. A sheet processing device has a detector configured to detect a printed part printed on a sheet; and an eraser configured to selectively remove at least a surface part of a printed area including the printed part detected by the detector. The eraser includes a grinding tool to grind the sheet, and a pressure mechanism configured to selectively increase contact pressure between the sheet and the grinding tool in the printed area.

A drawing object according to an embodiment of the present disclosure includes a stacked body including a plurality of heat-sensitive recording layers stacked with a heat-insulating layer interposed therebetween. The heat-sensitive recording layers are different from each other in color in a color-developed state and light absorption wavelength band. The plurality of heat-sensitive recording layers each has a striped pattern drawn as a drawing mark resulting from irradiating a surface of the drawing object with a laser light beam. The striped pattern extends in a first direction and has irregular widths.

According to an embodiment, an image processing system includes an image forming unit, a decoloring unit, a storage device, an operation panel and a processor. The storage device stores image data of a plurality of printed materials. The processor forms on a sheet an image based on image data in a page range of the printed material received by the operation panel. The processor determines whether or not images of all pages in the page range have been decolored in a predetermined range after the image formation is executed when the formed image is decolored by the decoloring unit.

A quota management apparatus includes a management section. The management section manages a value of a printing quota indicating a usable amount of an image forming apparatus by a user according to an image forming instruction by the user. If the image forming apparatus forms an image on a sheet on which an image is erased, the management section performs either a control of subtracting a value smaller than that in a case in which the image forming apparatus forms the image on a sheet on which the erasing of an image is not executed from the value of the printing quota, or a control of not subtracting the value of the printing quota.

Provided are a sheet processing device and a sheet manufacturing apparatus capable of removing color material from printed parts without excess or deficiency. A sheet processing device has a detector configured to detect a printed part printed on a sheet; and an eraser configured to selectively remove at least a surface part of a printed area including the printed part detected by the detector. The eraser includes a grinding tool to grind the sheet, and a pressure mechanism configured to selectively increase contact pressure between the sheet and the grinding tool in the printed area.