Method and device for producing 3d shaped articles with a double recoater

Abstract

The invention relates to a method and device for producing 3D moulded parts by means of a layer construction technique wherein a recoater is used which can coat in both directions of movement.

What is claimed is: 
     
         1 - 7 . (canceled) 
     
     
         8 . A device for producing 3D moulded parts, comprising
 i. at least one coater with two coating blades a particle application opening comprising one or two discharge gaps and one or two sealing gaps,   ii. at least one print head,   iii. at least one silo for particulate material,   iv. at least one means for generating oscillations and   v. a construction field, wherein the particle application opening is arranged substantially horizontally or vertically, or   the device comprises a coating unit comprising   vi. one or two silos,   vii. two substantially horizontal or vertical particle application openings and two coating blades, as well as   viii. at least one print head,   ix. one or two means for generating oscillations and   x. a construction field.   
     
     
         9 . A moulded part produced by the method of claim  1 , or by the device of  claim 8 . 
     
     
         10 . A particle application unit for producing 3D moulded parts comprising:
 i. one or two particle application openings, which are arranged substantially horizontally or vertically, comprising one or two discharge gaps and optionally one or two sealing gaps or one or two gap adjusting elements,   ii, two coating blades,   iii. one or two particulate material silo(s),   iv. one or two means for generating oscillations, and   wherein the particle application unit comprises a means for tilting the unit about an angle.   
     
     
         11 . The particle application unit of  claim 10 , where the two coating blades are provided as a single component. 
     
     
         12 .- 20 . (canceled) 
     
     
         21 . The device of  claim 8 , wherein the particle application opening(s) has one or two discharge gaps and one or two sealing gaps. 
     
     
         22 . The device of  claim 21 , wherein the particle application opening(s) is switchable. 
     
     
         23 . The device of  claim 21 , wherein the particle application opening(s) is arranged substantially at the lower end of the silo(s). 
     
     
         24 . The device of  claim 8 , wherein the silo(s) or/and the particle application openings and coating blades are tiltable by suitable means about an axis and an angle of 0.1 to 5° is adjustable between the construction field and each of the two coating blades. 
     
     
         25 . The device of  claim 8 , wherein the silo(s) the particle application openings and the coating blades are tiltable and/or adjustable individually about an axis by suitable means. 
     
     
         26 . The device of  claim 25 , wherein each coating blade is independently coupled with a means for generating oscillations. 
     
     
         27 . The device of  claim 8 , wherein the sealing gap and the discharge gap are adjustable by means of a gap adjusting element to a width of 5 to 0 mm. 
     
     
         28 . The device of  claim 8 , wherein the device components are arranged such that one respective coating blade and/or the silo can each carry out an oscillation. 
     
     
         29 . The device of  claim 28 , wherein the oscillation comprises vertical or/and horizontal components. 
     
     
         30 . The device of  claim 29 , wherein the oscillation is carried out substantially in the manner of a rotary motion. 
     
     
         31 . The device of  claim 8 , wherein a unit including the silos, the particle application openings, the coating blades and the means for generating oscillations is movable in two opposite directions and the application of particulate material is possible in each of the two opposite directions. 
     
     
         32 . The device of  claim 8 , wherein the coater device includes two coating blades and a single particle application opening. 
     
     
         33 . The device of  claim 32 , wherein the coater device includes two discharge gaps and a sealing gap. 
     
     
         34 . The method of  claim 8 , wherein the coater device includes two coating blades and two particle application openings. 
     
     
         35 . The method of  claim 34 , wherein the coater device includes two discharge gaps and two sealing gaps. 
     
     
         36 . The method of  claim 8 , wherein the coater device includes one coating blade and two particle application openings.