| 摘要 |
The invention relates to a device for processing highly viscous photopolymerizable material (6) for the layer-by-layer construction of a molding, comprising a trough (1) having a base (2) that is transparent, at least in some areas (3), a building platform (5), an exposure unit (4) for the locally selective exposure of a material layer formed between the underside of the construction platform and the trough base, a control unit for adapting the relative position of the construction platform in relation to the trough base following each exposure step for one layer (7), in order in this way to construct the molding gradually in the desired form, and a movably guided doctor (11) having a drive unit (8, 9) for moving the doctor to and fro under the construction platform. Here, the doctor has two doctor blades (16, 17) spaced apart in the direction of movement, which can be moved over the trough base at a constant distance from the latter. The trough has trough end walls, such that the doctor blade leading in the direction of movement moves respectively toward one of the trough end walls. Formed between the two doctor blades is a chamber (18) which is open at the bottom, the walls of which each have at least one opening passing through the wall in the direction of movement of the doctor in order to form a bypass duct (19), such that excess material backing up between the leading doctor blade and the trough end wall facing the latter is forced into the chamber through the at least one bypass duct. |
