The present invention relates to a 3D printer for construction for printing and forming various structures wherein a roller 50 follows a nozzle 10 which discharges concrete, mortar, or the like, to bring an outer peripheral surface of the roller 50 to be in close contact with a surface of the printed object, and thus the surface of the printed object is flattened. According to the present invention, a high-degree surface flattening work can be performed on the surface of a printed object simultaneously as the printed object is printed by a 3D printer for construction, thus enabling rapid and reliable flattening of the printed object and smooth surface forming.

A method for producing a ceramic honeycomb structure comprising a ceramic honeycomb body having large numbers of longitudinal cells partitioned by porous cell walls, and a peripheral wall formed on a peripheral surface of the ceramic honeycomb structure, comprising the steps of extruding a moldable ceramic material to form a honeycomb-structured ceramic green body; machining a peripheral portion of the green body or a sintered body obtained from the green body to remove part of cell walls in the peripheral portion, thereby obtaining the ceramic honeycomb body having longitudinal grooves on the peripheral surface; applying a coating material to the peripheral surface of the ceramic honeycomb body to form the peripheral wall, as well as to peripheral portions of both end surfaces of the ceramic honeycomb body; and inserting the coating material applied to the peripheral portions of both end surfaces into peripheral cells, with partially remaining on the peripheral portions.

The present invention relates to a 3D printer for construction for printing and forming various structures, in which a spray pipe follows a nozzle for discharging concrete or mortar, and sprays a liquid material onto the surface of a printed object, thereby enabling the liquid material to be applied on the surface of the printed object. Through the present invention, the printing of the printed object and the spraying of the liquid material onto the surface of the printed object may be carried out simultaneously by means of the 3D printer for construction, and thus a rapid and uniform coating treatment of the printed object is possible, and an adequate wet state of the tissue of the printed object may be maintained.

The aim of the invention is to provide a concrete printer which allows complex concrete elements and structures to be erected within a short time with the inclusion of a reinforcement and surfacing process. The concrete printer according to the invention, in particular for producing concrete elements and structures, has a vertically (Z) movable jack lift (6) which can be moved on two perpendicular rails (3) by a first drive unit (5). The jack lift (6) is connected to a longitudinal crossbeam (7) oriented horizontally in the longitudinal direction (X), and the longitudinal crossbeam (7) is connected to two guide rails (8) oriented in the longitudinal direction (X). A transverse crossbeam (9) which is oriented perpendicularly to the longitudinal crossbeam (7) can be moved along the guide rails (8) by a second drive unit (10), and at least one working head (13) is provided which can be moved along the transverse crossbeam (9), comprises at least one concrete printing nozzle (11), and can be moved by a third drive unit (12). The actuation of all the drive units (4, 5, 10, 12) and the concrete printing nozzles (11, 11a, 11b) is carried out by a control unit (41). In the method according to the invention, supporting concrete (18) is first cast or dispensed from a supporting concrete nozzle (11a) for an outer contour (18) and/or an inner contour (18). Reinforcement rods (31) are then optionally inserted, and the intermediate spaces (47) between the supporting concrete portions (18) and optional reinforcement rods (31) are then cast with liquid concrete (19) from the liquid concrete nozzle (11b).

Disclosed herein are plaster boards having a first surface and an opposing second surface, and a first edge and an opposing second edge that bound the first surface and the second surface. The first surface includes a first section and a second section, the first section being raised compared to the second section, the second section abutting the second edge. The second surface includes a first section and a second section that are separated by a boundary between the first edge and the second edge. The first section of the second surface is substantially parallel to the first section of the first surface. The second section of the second surface slopes toward the first surface from the boundary toward the second edge. Methods for making the plaster boards involve forming wet plaster material and drying the wet plaster material such that the wet plaster material hardens into a plasterboard.

To provide a faraday rotator using a TGG ceramic sintered compact and a light isolator using the faraday rotator such that the influence of scattered light can be relatively reduced and overall characteristics degradation for the entire light isolator is minimized so that a high extinction ratio of at least 38 dB or greater is achieved. [Solution] The faraday rotator according to the present invention uses a TGG ceramic sintered compact having an average particle diameter of 0.2 to 5.0 m, and has a transmission beam diameter of 0.3 mm or more, the TGG ceramic sintered compact being preferably annealed.

Systems and methods for treating concrete, which include wetting a surface of concrete with a colloidal silica and, with silica on the surface, finishing the surface. The surface may be finished with a power trowel.

A method of forming a lightweight concrete block and the resulting structure. Calcium sulfoaluminate (CSA) cement and specialized grout maybe added to an amount of water in a mixer. The CSA cement, specialized grout, and water may be blended to a smooth consistency. Lightweight aggregates (LWA) maybe added to form a mixture. The mixture may be poured into a mold, allowed the mixture to cure, and removed from the mold to form the lightweight concrete block. The lightweight concrete block may have a first side and a second side joined by a plurality of interposing walls, the interposing walls defining one or more inner cavities and one or more outer cavities. The lightweight concrete block may have features that allow for the insertion of fiberglass rebar to aide in stacking and filling to form a wall.

The invention presents a method and system for enhancing the aesthetics and functionality of 3D printed concrete objects. It involves an inkjet printing processes to improve the quality of the printed concrete objects. The method involves using a robot-mounted inkjet printhead, directed by a computer-controlled mechanism, to apply high-resolution imagery, colors, or patterns onto the object's surface while following the non-uniform contours of the object, including 3D printed ridges. The applied ink is then allowed to cure and bond with the object's surface. The invention enhances the detail and enables the application of high-resolution images onto 3D printed concrete structures.

A method of marking a surgical instrument with a symbol formed in or on a smooth surface comprises forming a symbol in or on a smooth surface of the surgical instrument; and forming a plurality of angled surfaces over at least part of the area of the symbol. The angled surfaces define a plurality of parallel ridges and grooves in the symbol. The steps of forming the symbol and forming the plurality of angled surfaces take place substantially simultaneously in a single step.